You searched for subject:(Software layer).
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Texas A&M University
1.
Shome, Prithviraj.
Towards a Principled Wireless Support in SDN.
Degree: MS, Computer Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/156986 
► Software Defined Networking (SDN) has recently emerged as a transformational tool to design and operate communication networks and services. While the SDN approach has significant…
(more)
▼ Software Defined Networking (SDN) has recently emerged as a transformational tool to design and operate communication networks and services. While the SDN approach has significant benefits for both wireline and wireless radio networks, the support for wireless networks in SDN technologies is still in its infancy as compared to wired networks. One of the key features of SDN is that networks can be managed in a programmatic manner. The challenge for building such a model for wireless radio networks is that there is a plethora of radio protocols that need to be supported, each having its own nuances. To address this, we need to build fundamental abstractions that provide enough visibility so that a programmer can implement protocols, while at the same time being rigid enough not to expose excessive details that will complicate the application development process. The purpose of this work is to introduce a principled approach towards building a cross-
layer architecture for wireless networks so that they can receive the same level of programmability as wireline interfaces. Specifically we aim to integrate wireless protocols into the general SDN framework and to provide a logical and consistent view of physical
layer radio resources. This is achieved by proposing a new set of abstractions and their interfaces based upon existing SDN terminology and the basic building blocks of
Software Defined Radio (SDR) in wireless devices. We validate our approach by implementing our design as an extension of an existing OpenFlow data plane and deploying it in an IEEE 802.11 accesspoint as well as in a typical SDR system.
Advisors/Committee Members: Sprintson, Alex (advisor), Gratz, Paul (committee member), Stoleru, Radu (committee member).
Subjects/Keywords: software defined networking; software defined radio; transport layer security protocol; transmission control protocol
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APA (6th Edition):
Shome, P. (2016). Towards a Principled Wireless Support in SDN. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156986
Chicago Manual of Style (16th Edition):
Shome, Prithviraj. “Towards a Principled Wireless Support in SDN.” 2016. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/156986.
MLA Handbook (7th Edition):
Shome, Prithviraj. “Towards a Principled Wireless Support in SDN.” 2016. Web. 28 Feb 2021.
Vancouver:
Shome P. Towards a Principled Wireless Support in SDN. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/156986.
Council of Science Editors:
Shome P. Towards a Principled Wireless Support in SDN. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156986
Universidade Nova
2.
Lopes, André Filipe da Rocha.
tlCell: a software transactional memory for the cell broadband engine architecture.
Degree: 2010, Universidade Nova
URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/4110
► Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para a obtenção do Grau de Mestre em Engenharia Informática
Os computadores…
(more)
▼ Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para a obtenção do Grau de Mestre em Engenharia Informática
Os computadores evoluíram exponencialmente na ultima década. A performance tem sido
o principal objectivo resultando no aumento do frequência dos processadores, situação que
já não é fazível devido ao consumo de energia exagerado dos processadores actuais. A arquitectura Cell Broadband Engine começou com o objectivo de providenciar alta capacidade computacional com um baixo consumo energético. O resultado é uma arquitectura com multiprocessadores
heterogéneos e uma distribuição de memória única com vista a alto desempenho e redução da complexidade do hardware para reduzir o custo de produção. Espera-se que as técnicas de concorrência e paralelismo aumentem a performance desta arquitectura, no entanto
as soluções de alto desempenho apresentadas s˜ao sempre muito especificas e devido à
sua arquitectura e distribuição de memória inovadora ´e ainda difícil apresentar ferramentas passíveis de explorar concorrência e paralelismo como um camada de abstracção. Memória Transaccional por Software é um modelo de programação que propõe este nível de abstracção e tem vindo a ganhar popularidade existindo já variadas implementações com performance perto de soluções específicas de grão fino. A possibilidade de usar Memória Transaccional
por Software nesta arquitectura inovadora, desenvolvendo uma ferramenta capaz de abstrair o programador da consistência e gestão de memória é apelativo. Neste documento especifica-se uma plataforma deffered-update de Memória Transactional por Software para a arquitectura Cell Broadband Engine que tira partido da capacidade computacional dos Synergistic Processing
Elements (SPEs) usando locks em commit-time. São propostos dois modelos diferentes,
fully local e multi-buffered de forma a poder estudar as implicações das escolhas feitas no desenho da plataforma.
Advisors/Committee Members: Lourenço, João.
Subjects/Keywords: Memória transacional por software; Cell broadband engine architecture; Consistent transaction layer
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APA (6th Edition):
Lopes, A. F. d. R. (2010). tlCell: a software transactional memory for the cell broadband engine architecture. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/4110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lopes, André Filipe da Rocha. “tlCell: a software transactional memory for the cell broadband engine architecture.” 2010. Thesis, Universidade Nova. Accessed February 28, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/4110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lopes, André Filipe da Rocha. “tlCell: a software transactional memory for the cell broadband engine architecture.” 2010. Web. 28 Feb 2021.
Vancouver:
Lopes AFdR. tlCell: a software transactional memory for the cell broadband engine architecture. [Internet] [Thesis]. Universidade Nova; 2010. [cited 2021 Feb 28].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/4110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lopes AFdR. tlCell: a software transactional memory for the cell broadband engine architecture. [Thesis]. Universidade Nova; 2010. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/4110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Luleå University of Technology
3.
Bamfaste, Steffen.
Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services.
Degree: 2016, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48188
► The Multipurpose End-To-End Robotics Operations Network, in short METERON, is a project initiated by the European Space Agency in order to prepare for the…
(more)
▼ The Multipurpose End-To-End Robotics Operations Network, in short METERON, is a project initiated by the European Space Agency in order to prepare for the high complexity of future robotic space exploration missions. For this purpose, METERON provides a test environment that allows to evaluate and to demonstrate relevant concepts and technologies in the domains of Communications, Operations and Robotics.The effort for the integration of diverse robotic systems, especially from other agencies, into the METERON infrastructure can be decreased remarkably if standardised interfaces for common robotic capabilities are available. Hence, a set of Web Services, the METERON Robotic Services, have been developed in a communication and implementation agnostic manner, following the service oriented design principles of the CCSDS Mission Operations framework.This work presents the re-integration of the METERON Robotic Services and the robotic elements of the METERON project which became necessary after a redesign of the services implementation. The existent tight integration between the services and the robotic elements is removed and an additional software layer is developed that allows a clean separation between those two systems. The software layer interfaces the METERON Robotic Services and is attached to the robotic elements, allowing them to communicate with the METERON Operational Environment. Thereby, the layer acts as an independent adapter which transmits telecommands, telemetry and notifications from and to the METERON Robotic Services.Sophisticated testing was performed within METERON’s Development Chain, which is meant to simulate the setup of the system architecture as present during experiments, showing that the developed adapter is correctly accomplishing its designated tasks. Moreover, the performance of the whole METERON infrastructure in synergy with the adapter was validated. Hence, the presented work can be seen as a proof-of-concept for the future integration of robotic systems from other agencies into the METERON infrastructure with less effort for custom software development by connecting with the METERON Robotic Services.
Validerat; 20160313 (global_studentproject_submitter)
Subjects/Keywords: Technology; METERON; Standardisation; Robotic; Web Services; Software Layer; Operations; Teknik
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APA (6th Edition):
Bamfaste, S. (2016). Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48188
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bamfaste, Steffen. “Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services.” 2016. Thesis, Luleå University of Technology. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48188.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bamfaste, Steffen. “Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services.” 2016. Web. 28 Feb 2021.
Vancouver:
Bamfaste S. Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services. [Internet] [Thesis]. Luleå University of Technology; 2016. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48188.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bamfaste S. Development of a Software Layer for the Integration of Robotic Elements into the METERON Infrastructure using Robotic Services. [Thesis]. Luleå University of Technology; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48188
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
4.
Kaleem, Muhammad Khizer.
Physical Layer Approach for Securing RFID Systems.
Degree: 2013, University of Waterloo
URL: http://hdl.handle.net/10012/7702
► Radio Frequency IDentification (RFID) is a contactless, automatic identification wireless technology primarily used for identifying and tracking of objects, goods and humans. RFID is not…
(more)
▼ Radio Frequency IDentification (RFID) is a contactless, automatic identification wireless technology primarily used for identifying and tracking of objects, goods and humans. RFID is not only limited to identification and tracking applications. This proliferating wireless technology has been deployed in numerous securities sensitive applications e.g. access control, e-passports, contactless payments, driver license, transport ticking and health cards.
RFID inherits all the security and privacy problems that are related to wireless technology and in addition to those that are specific to RFID systems. The security and privacy protection schemes proposed in literature for wireless devices are mostly secured through symmetric/asymmetric keys encryption/decryption and hash functions. The security of all these cryptographic algorithms depends on computationally complex problems that are hard to compute using available resources. However, these algorithms require cryptographic operations on RFID tags which contradict the low cost demand of RFID tags. Due to limited number of logic gates in tags, i.e., 5K-10K, these methods are not practical. Much research effort has done in attempt to solve consumer's privacy and security problem. Solutions that prevent clandestine inventory are mostly application layer techniques.
To solve this problem, a new RFID physical layer scheme has been proposed namely Direct Sequence Backscatter Encryption (DSB Enc). The proposed scheme uses level generator to produce different levels before transmitting the signal to the tag. The tag response to the signal sent by the reader using backscatter communications on the same signal which looks random to the eavesdropper. Therefore eavesdropper cannot extract the information from reader to tag and tag to reader communication using passive eavesdropping. As reader knows the different generated levels added to the carrier signal, it can remove the levels and retrieve the tag's messages.
We proposed a lightweight, low-cost and practically secure physical layer security to the RFID system, for a supply chain processing application, without increasing the computational power and tag's cost. The proposed scheme was validated by simulations on GNU Radio and experimentation using SDR and a WISP tag. Our implementation and experimental results validate that DSB Enc is secure against passive eavesdropping, replay and relay attacks. It provides better results in the presence of AWGN channel.
Subjects/Keywords: DSB Enc; RFID; USRP; SDR; GNU Radio; Level generator; Physical layer encryption; Software Defined Radio; Intel WISP tag; GRC; Security
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APA (6th Edition):
Kaleem, M. K. (2013). Physical Layer Approach for Securing RFID Systems. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7702
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kaleem, Muhammad Khizer. “Physical Layer Approach for Securing RFID Systems.” 2013. Thesis, University of Waterloo. Accessed February 28, 2021.
http://hdl.handle.net/10012/7702.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kaleem, Muhammad Khizer. “Physical Layer Approach for Securing RFID Systems.” 2013. Web. 28 Feb 2021.
Vancouver:
Kaleem MK. Physical Layer Approach for Securing RFID Systems. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10012/7702.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kaleem MK. Physical Layer Approach for Securing RFID Systems. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7702
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ottawa
5.
Qi, Shunchao.
Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
.
Degree: 2017, University of Ottawa
URL: http://hdl.handle.net/10393/37019
► Several geotechnical processes can only be reliably interpreted by taking account of the soil-atmosphere interactions. This thesis investigates two geotechnical problems involving soil-atmosphere interactions that…
(more)
▼ Several geotechnical processes can only be reliably interpreted by taking account of the soil-atmosphere interactions. This thesis investigates two geotechnical problems involving soil-atmosphere interactions that drive water flow through the soil skeleton in two opposite directions; Problem 1: slope failure in expansive soils induced by water infiltration, Problem 2: large strain consolidation of soft soils induced by water evaporation. Both problems are of practical interest for safe and economical design of various geotechnical infrastructures. Two major geotechnical activities in the world; namely, the construction of water transfer canal in expansive soil area in China and the deposition of oil sands and hard rock tailings in Canada can be cited as classic examples of Problems 1 and 2, respectively. In such problems, substantial zones of the domain may switch between an unsaturated and saturated condition. Therefore, rational analysis requires simultaneous modelling of both unsaturated and saturated soil behaviour.
The first goal of this thesis is to investigate the influence of swelling (the most characteristic behaviour of expansive soils) on slope stability using numerical methods. Swelling of expansive soils contributes to slope instability during rainfall because of two key reasons (i) soil swelling affects the flow process that actually induces swelling, (i.e. a typical coupling phenomenon), and (ii) swelling-induced stress redistribution and displacement development. In this thesis, the first effect is studied by a coupled (mechanical-hydraulic) numerical analysis of the response of a slope to rainfall using commercial software (GeoSlope). The second effect, the swelling-induced stress redistribution and displacement development after wetting, is tracked using a newly developed numerical program. In the program strain softening behaviour is introduced into the elasto-plastic Mohr-Coulomb Model for modelling unsaturated soil. A novel stress (net stress and suction)-dependent model for moduli of elasticity, combined with the predictive model for shear strength based on Soil Water Retention Behaviour are incorporated into the numerical program to achieve a smooth transition between saturated and unsaturated states. The results show that soil swelling can decrease the factor of safety by accelerating the wetting front depth due to hydro-mechanical coupling, while changes of sliding mass geometry has a negligible influence. The change of stress regime associated with soil swelling is significant to induce plastic strain softening (swelling-induced softening) and contribute to the slope failures.
The second goal of thesis is to develop a novel computer program for simulation of large strain consolidation of soft soil under both self-weight and evaporation conditions. This program is both theoretically sound and practically applicable. Several basic/advanced constitutive models for unsaturated soils, including State Surface Model (SSM), Barcelona Basic model (BBM), Glasgow Coupled model (GCM) and bounding…
Subjects/Keywords: Unsaturated Soils;
Slope Stability;
Large Strain Consolidation;
Expansive Soils;
UNSATCON Software;
Numerical Model;
Soft Soils;
Desaturation/Dewatering;
Multi-layer Deposition;
Tailings
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APA ·
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Manager
APA (6th Edition):
Qi, S. (2017). Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/37019
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Qi, Shunchao. “Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
.” 2017. Thesis, University of Ottawa. Accessed February 28, 2021.
http://hdl.handle.net/10393/37019.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Qi, Shunchao. “Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
.” 2017. Web. 28 Feb 2021.
Vancouver:
Qi S. Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
. [Internet] [Thesis]. University of Ottawa; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10393/37019.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Qi S. Numerical Investigation for Slope Stability of Expansive Soils and Large Strain Consolidation of Soft Soils
. [Thesis]. University of Ottawa; 2017. Available from: http://hdl.handle.net/10393/37019
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Pinto, Emanuel Ângelo Leites.
Controlador dedicado de Ecrãs LCD/TFT.
Degree: 2011, Instituto Politécnico do Porto
URL: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2658
► Para dar resposta aos grandes avanços tecnológicos e, consequentemente, à postura mais exigente dos clientes, a empresa Francisco Parracho – Electrónica Industrial, Lda., que tem…
(more)
▼ Para dar resposta aos grandes avanços tecnológicos e, consequentemente, à postura mais
exigente dos clientes, a empresa Francisco Parracho – Electrónica Industrial, Lda., que tem
actividade no ramo dos elevadores, decidiu introduzir no mercado um controlador
dedicado de ecrãs Liquid Crystal Display / Thin Film Transistor (LCD / TFT). O objectivo
é substituir um sistema suportado por um computador, caracterizado pelas suas elevadas
dimensões e custos, mas incontornável até à data, nomeadamente para resoluções de ecrã
elevadas.
E assim nasceu este trabalho. Com uma selecção criteriosa de todos os componentes e,
principalmente, sem funcionalidades inúteis, obteve-se um sistema embebido com
dimensões e custos bem mais reduzidos face ao seu opositor.
O ecrã apontado para este projecto é um Thin Film Transistor – Liquid Crystal Display
(TFT-LCD) da Sharp de 10.4” de qualidade industrial, com uma resolução de 800 x 600
píxeis a 18 bits por píxel.
Para tal, foi escolhido um micro-controlador da ATMEL, um AVR de 32 bits que, entre
outras características, possui um controlador LCD que suporta resoluções até 2048 x 2048
píxeis, de 1 a 24 bits por píxel.
Atendendo ao facto deste produto ser inserido na área dos elevadores, as funcionalidades,
quer a nível do hardware quer a nível do software, foram projectadas para este âmbito.
Contudo, o conceito aqui exposto é adjacente a quaisquer outras áreas onde este produto se
possa aplicar, até porque o software está feito para se tornar bem flexível.
Com a ajuda de um kit de desenvolvimento, foram validados os drivers dos controladores e
periféricos base deste projecto. De seguida, aplicou-se esse software numa placa de
circuito impresso, elaborada no âmbito deste trabalho, para que fossem cumpridos todos os
requisitos requeridos pela empresa patrocinadora:
- Apresentação de imagens no ecrã consoante o piso;
- Possibilidade de ter um texto horizontalmente deslizante;Indicação animada do sentido do elevador;
- Representação do piso com deslizamento vertical;
- Descrição sumária do directório de pisos também com deslizamento vertical;
- Relógio digital;
- Leitura dos conteúdos pretendidos através de um cartão SD/MMC;
- Possibilidade de actualização dos conteúdos via USB flash drive.
With the intent to keep up with the major technological breakthroughs and therefore
answer to the most demanding customers, the company Francisco Parracho – Electrónica
Industrial, Lda., well established in the elevators field, has decided to market a dedicated
Liquid Crystal Display / Thin Film Transistor (LCD / TFT) screen controller. The aim is to
replace a computer based system, characterized by its inevitable large dimensions and high
price, particularly for high screen resolutions.
And that's how this work began. With a careful selection of all components and, especially,
without unnecessary features, we have obtained an embedded system with much lower size
and cost compared to the previous solution.
The screen selected for this project is an industrial grade 10.4” Sharp Thin Film Transistor
- Liquid…
Advisors/Committee Members: Leitão, João Miguel Queirós Magno, Baptista, João Paulo, Parracho, Helder.
Subjects/Keywords: Controlador; Ecrã; LCD; Píxeis; Elevador; Piso; Micro-controlador (μC); Hardware; Software; Camada da aplicação; Controller; Screen; Pixels; Elevator; Floor; Microcontroller (μC); Application layer
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APA ·
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Manager
APA (6th Edition):
Pinto, E. . L. (2011). Controlador dedicado de Ecrãs LCD/TFT. (Thesis). Instituto Politécnico do Porto. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2658
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pinto, Emanuel Ângelo Leites. “Controlador dedicado de Ecrãs LCD/TFT.” 2011. Thesis, Instituto Politécnico do Porto. Accessed February 28, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2658.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pinto, Emanuel Ângelo Leites. “Controlador dedicado de Ecrãs LCD/TFT.” 2011. Web. 28 Feb 2021.
Vancouver:
Pinto EL. Controlador dedicado de Ecrãs LCD/TFT. [Internet] [Thesis]. Instituto Politécnico do Porto; 2011. [cited 2021 Feb 28].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2658.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pinto EL. Controlador dedicado de Ecrãs LCD/TFT. [Thesis]. Instituto Politécnico do Porto; 2011. Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2658
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Κιουμουρτζής, Γεώργιος.
Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας.
Degree: 2010, University of Patras
URL: http://nemertes.lis.upatras.gr/jspui/handle/10889/4061
► Οι εφαρμογές πολυμέσων έχουν αποκτήσει τα τελευταία χρόνια μία αυξανόμενη ζήτηση από τους χρήστες γενικά του Διαδικτύου καθώς προσφέρουν νέες και ποικιλόμορφες δυνατότητες ανταλλαγής πληροφοριών…
(more)
▼ Οι εφαρμογές πολυμέσων έχουν αποκτήσει τα τελευταία χρόνια μία αυξανόμενη ζήτηση από τους χρήστες γενικά του Διαδικτύου καθώς προσφέρουν νέες και ποικιλόμορφες δυνατότητες ανταλλαγής πληροφοριών εικόνας και ήχου. Όμως οι εφαρμογές αυτές υπόκεινται σε περιορισμούς που έχουν να κάνουν κυρίως με τη φύση τους και χαρακτηρίζονται από τις υψηλές απαιτήσεις σε ρυθμό μετάδοσης δεδομένων (bandwidth-consuming applications) και την ευαισθησία τους στις καθυστερήσεις που παρουσιάζονται κατά τη μετάδοση των πακέτων από τον αποστολέα στο παραλήπτη (delay-sensitive applications). Από την άλλη μεριά οι εφαρμογές αυτές φέρεται ότι είναι λιγότερο ευαίσθητες στις απώλειες των πακέτων (packet-loss tolerant applications). Το ζητούμενο όμως με τις εφαρμογές πολυμέσων, πέρα από το εύρος των υπηρεσιών τις οποίες προσφέρουν, είναι και η παρεχόμενη ποιότητα των υπηρεσιών (Quality of Service, QOS) στο τελικό χρήστη. Η ποιότητα αυτή των υπηρεσιών συνδέεται άμεσα με τα προαναφερόμενα χαρακτηριστικά των εφαρμογών πολυμέσων.
Η μέχρι τώρα προσέγγιση από την ερευνητική κοινότητα αλλά και τις εταιρείες παροχής υπηρεσιών Διαδικτύου (Internet Service Providers), σε ότι αφορά την εξασφάλιση της ποιότητας υπηρεσιών, έχει εστιασθεί είτε στην επιμέρους βελτιστοποίηση της απόδοσης των πρωτοκόλλων μετάδοσης, είτε στην εγκατάσταση επιπλέον εξοπλισμού για τη δημιουργία δικτύων διανομής πολυμέσων (Content Distribution Networks, CDNs) που τοποθετούνται συνήθως κοντά στον τελικό χρήστη. Επιπρόσθετα η αυξανόμενη προσπάθεια της ερευνητικής κοινότητας με σκοπό την αύξηση της ποιότητας υπηρεσιών προσέφερε νέες καινοτόμες λύσεις με την μορφή των υπηρεσιών-αρχιτεκτονικών όπως οι Ολοκληρωμένες Υπηρεσίες (Integrated services, Intserv) και οι Διαφοροποιημένες Υπηρεσίες (Differentiated Services, Diffserv) οι οποίες φιλοδοξούν να προσφέρουν εγγυήσεις ποιότητας υπηρεσιών σε συγκεκριμένες ομάδες χρηστών. Όμως και οι δύο αυτές αρχιτεκτονικές δεν κατάφεραν μέχρι τώρα να αποτελέσουν μια ολοκληρωμένη λύση για τη παροχή εγγυήσεων ποιότητας υπηρεσιών στο χρήστη λόγω των μεγάλων δυσκολιών στην εφαρμογή τους που έχουν να κάνουν τόσο με χρηματοοικονομικά κριτήρια όσο και με τη ίδια τη δομή του Διαδικτύου.
Έτσι βλέπουμε ότι παρόλη τη πρόοδο που έχει γίνει μέχρι σήμερα στη τεχνολογία των δικτύων η παροχή ποιότητας υπηρεσίας στο Διαδίκτυο από άκρο σε άκρο δεν είναι ακόμη στις μέρες μας εφικτή με αποτέλεσμα οι υπηρεσίες μετάδοσης πολυμέσων στο Διαδίκτυο – π.χ “youtube” – να επηρεάζονται σημαντικά από τις όποιες μεταβολές στη κατάσταση του δικτύου.
Προς το σκοπό αυτό η ερευνητική κοινότητα έχει στραφεί στη μελέτη μηχανισμών οι οποίοι θα είναι να θέση να προσαρμόζουν το ρυθμό μετάδοσης της πολυμεσικής πληροφορίας, ανάλογα με τις εκάστοτε συνθήκες του δικτύου, έτσι ώστε να προσφέρουν τη μέγιστη δυνατή ποιότητα υπηρεσίας στο τελικό χρήστη. Η προσπάθεια αυτή μπορεί να κατηγοριοποιηθεί σε δύο μεγάλες κατηγορίες ανάλογα με το τρόπο δρομολόγησης της πολυμεσικής πληροφορίας, όπως παρακάτω:
• Μηχανισμοί προσαρμογής για unicast μετάδοση: Σε αυτή τη περίπτωση οι μηχανισμοί προσαρμογής…
Advisors/Committee Members: Μπούρας, Χρήστος, Kioumourtzis, Georgios, Μπούρας, Χρήστος, Αλεξίου, Γεώργιος, Βαρβαρίγος, Εμμανουήλ, Βλάχος, Κυριάκος, Γαροφαλάκης, Ιωάννης, Μπερμπερίδης, Κωνσταντίνος, Σπυράκης, Παύλος.
Subjects/Keywords: Εφαρμογές πολυμέσων; Πρωτόκολλα πραγματικού χρόνου; Διαστρωματική προσαρμογή; Λογισμικό προσομοίωσης ns-2; 004.69; Multimedia applications; Real time protocols; Cross layer adaptation; Simulation software ns-2
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APA (6th Edition):
Κιουμουρτζής, . (2010). Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας. (Doctoral Dissertation). University of Patras. Retrieved from http://nemertes.lis.upatras.gr/jspui/handle/10889/4061
Chicago Manual of Style (16th Edition):
Κιουμουρτζής, Γεώργιος. “Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας.” 2010. Doctoral Dissertation, University of Patras. Accessed February 28, 2021.
http://nemertes.lis.upatras.gr/jspui/handle/10889/4061.
MLA Handbook (7th Edition):
Κιουμουρτζής, Γεώργιος. “Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας.” 2010. Web. 28 Feb 2021.
Vancouver:
Κιουμουρτζής . Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας. [Internet] [Doctoral dissertation]. University of Patras; 2010. [cited 2021 Feb 28].
Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/4061.
Council of Science Editors:
Κιουμουρτζής . Πρωτόκολλα πραγματικού χρόνου για τη μετάδοση πληροφορίας πολυμέσων με δυνατότητα προσαρμογής σε δίκτυα μη εγγυημένης ποιότητας. [Doctoral Dissertation]. University of Patras; 2010. Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/4061
8.
Pham, Tuan Anh.
OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle.
Degree: Docteur es, Informatique, 2017, Université Côte d'Azur (ComUE)
URL: http://www.theses.fr/2017AZUR4075
► Dans cette thèse, nous étudions plusieurs modèles de collaboration entre l’ingénierie logiciel et le web sémantique. À partir de l’état de l’art, nous proposons une…
(more)
▼ Dans cette thèse, nous étudions plusieurs modèles de collaboration entre l’ingénierie logiciel et le web sémantique. À partir de l’état de l’art, nous proposons une approche d’utilisation de l’ontologie dans la couche de métier d’une application. L’objectif principal de notre travail est de fournir au développeur des outils pour concevoir la matière déclarative une couche de métier "exécutable" d’une application afin de simuler son fonctionnement et de montrer ainsi la conformité de l’application par rapport aux exigences du client au début du cycle de vie du logiciel. Un autre avantage de cette approche est de permettre au développeur de partager et de réutiliser la description de la couche de métier d’une application dans un domaine en utilisant l’ontologie. Celle-ci est appelée "patron d’application". La réutilisation de la description de la couche de métier d’une application est un aspect intéressant à l'ingénier logiciel. C’est le point-clé que nous voulons considérer dans cette thèse. Dans la première partie de notre travail, nous traitons la modélisation de la couche de métier. Nous présentons d’abord une approche fondée sur l’ontologie pour représenter les processus de métiers et les règles de métiers et nous montrons comment vérifier la cohérence du processus et de l’ensemble des règles de métier. Puis, nous présentons le mécanisme de vérification automatique de la conformité d’un processus de métier avec un ensemble de règles de métier. La deuxième partie de cette thèse est consacrée à définir une méthodologie, dite de personnalisation, de création une application à partir d'un "patron d’application". Cette méthode permettra à l'utilisateur d'utiliser un patron d'application pour créer sa propre application en évitant les erreurs de structures et les erreurs sémantiques. Nous introduisons à la fin de cette partie, la description d’une plateforme expérimentale permettant d’illustrer la faisabilité des mécanismes proposés dans cette thèse. Cette plateforme est réalisée sur un SGBD relationnel.
In this thesis, we study several models of collaboration between Software Engineering and Semantic Web. From the state of the art, we propose an approach to the use of ontology in the business application layer. The main objective of our work is to provide the developer with the tools to design, in the declarative manner, a business "executable" layer of an application in order to simulate its operation and thus show the compliance of the application with the customer requirements defined at the beginning of the software life cycle. On the other hand, another advantage of this approach is to allow the developer to share and reuse the business layer description of a typical application in a domain using ontology. This typical application description is called "Application Template". The reuse of the business layer description of an application is an interesting aspect of software engineering. That is the key point we want to consider in this thesis. In the first part of this thesis, we deal with the modeling of the…
Advisors/Committee Members: Le Thanh, Nhan (thesis director).
Subjects/Keywords: Génie logiciel; Web sémantique; Ontologie; OWL; SWRL; RDF; Conformité aux processus de métiers; Couche de métier; Software engineering; Semantic Web; Ontology; OWL; SMRL; RDF; Business process compliance; Business logic layer
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Pham, T. A. (2017). OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle. (Doctoral Dissertation). Université Côte d'Azur (ComUE). Retrieved from http://www.theses.fr/2017AZUR4075
Chicago Manual of Style (16th Edition):
Pham, Tuan Anh. “OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle.” 2017. Doctoral Dissertation, Université Côte d'Azur (ComUE). Accessed February 28, 2021.
http://www.theses.fr/2017AZUR4075.
MLA Handbook (7th Edition):
Pham, Tuan Anh. “OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle.” 2017. Web. 28 Feb 2021.
Vancouver:
Pham TA. OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle. [Internet] [Doctoral dissertation]. Université Côte d'Azur (ComUE); 2017. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2017AZUR4075.
Council of Science Editors:
Pham TA. OntoApp : une approche déclarative pour la simulation du fonctionnement d’un logiciel dès une étape précoce du cycle de vie de développement : OntoApp : a declarative approach for software reuse and simulation in early stage of software development life cycle. [Doctoral Dissertation]. Université Côte d'Azur (ComUE); 2017. Available from: http://www.theses.fr/2017AZUR4075
Georgia Tech
9.
Piercy, Brandon Deane.
ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD.
Degree: PhD, Materials Science and Engineering, 2019, Georgia Tech
URL: http://hdl.handle.net/1853/64046
► Atomic Layer Deposition (ALD) is a critical thin film deposition technology with applications spanning microelectronics, solar fuels and biological preservation due to its advantages of…
(more)
▼ Atomic
Layer Deposition (ALD) is a critical thin film deposition technology with applications spanning microelectronics, solar fuels and biological preservation due to its advantages of a wide precursor library for the majority of the periodic table, exquisite control over growth rates, and the ability to deposit at extremely low temperatures. One critical parameter in ALD growth is deposition temperature, which defines the “ALD window”—a temperature range in which ALD growth kinetics hold. Most ALD processes tend to be limited to deposition temperatures of <300 ˚C, causing ALD films to be typically amorphous as-deposited. While amorphous inorganic films are often thought to be structurally equivalent, films grown by ALD can vary significantly in mechnical, optical, thermal, and electronic properties. By changing deposition temperature from room temperature to 150 ˚C, amorphous TiO2 films are shown to exhibit a change in density of 15% and a change in optical polarizability of 10%. These shifts in density correspond to a decrease in the thermal conductivity of TiO2 thin films and a decrease in Ti3+-based electron trap states.
High deposition temperatures are usually required to deposit crystalline films, which are typically not compatible with ALD precursors. A method called resistive pulsed-heating ALD (PH-ALD) is introduced as a strategy to circumvent the thermal limitations of ALD precursors by applying a short heat pulse to the film after low-temperature deposition cycles in the ALD process. The PH-ALD technique is used to grow epitaxial ZnO films on c-plane sapphire using the low-temperature diethylzinc-water ALD process. Epitaxial films are grown at pulse temperatures of 500˚C and above, and at deposition cycles:heat pulse ratios of 5:1. Furthermore, the PH-ALD process is used for templating epitaxial growth in ZnO, with films as thin as 5 PH-ALD cycles capable of templating an epitaxial film up to 100 nm thick. Electrical and optical measurements are shown to be comparable to films grown by other physical and chemical vapor deposition techniques, indicating that the PH-ALD method may be a practical approach for the growth of complex crystalline oxide thin films. To support future workers in this field, detailed descriptions of control
software, hardware, and reactor designs are provided to enable the development of ALD systems that can incorporate external sensors and controllers for advanced intelligent processing recipes.
Advisors/Committee Members: Losego, Mark D (advisor), Vogel, Eric M (committee member), Filler, Michael A (committee member), Bassiri-Gharb, Nazanin (committee member), Doolittle, Willam A (committee member).
Subjects/Keywords: atomic layer deposition; thin film; tio2; titanium oxide; zno; zinc oxide; pulsed-heating; modulated temperature annealing; thermal conductivity; polarizability; control software; reactor design; epitaxy
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Piercy, B. D. (2019). ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/64046
Chicago Manual of Style (16th Edition):
Piercy, Brandon Deane. “ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD.” 2019. Doctoral Dissertation, Georgia Tech. Accessed February 28, 2021.
http://hdl.handle.net/1853/64046.
MLA Handbook (7th Edition):
Piercy, Brandon Deane. “ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD.” 2019. Web. 28 Feb 2021.
Vancouver:
Piercy BD. ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1853/64046.
Council of Science Editors:
Piercy BD. ENGINEERING STRUCTURE AND PHASE VIA TEMPERATURE MANIPULATION IN THIN FILM OXIDES GROWN BY ALD. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/64046
Universidad Nacional de La Plata
10.
Barreto, Marcelo.
Evaluación de tecnología SDN.
Degree: 2017, Universidad Nacional de La Plata
URL: http://sedici.unlp.edu.ar/handle/10915/67011
► Las redes de computadoras actuales son complejas y difíciles de administrar, y están compuestas de una amplia variedad de equipamiento. Los routers y switches ejecutan…
(more)
▼ Las redes de computadoras actuales son complejas y difíciles de administrar, y están compuestas de una amplia variedad de equipamiento. Los routers y switches ejecutan software de control complejo y distribuido que generalmente es propietario y cerrado, encargado de implementar protocolos de red que requieren años de estandarización y pruebas de interoperabilidad.
Para que estas puedan operar los administradores de red deben configurar cada uno de los dispositivos utilizando interfaces de configuración, que varían según el vendedor del dispositivo e incluso entre productos del mismo vendedor. Como consecuencia la innovación en el ámbito de las redes ha sido lenta, y ha aumentado la complejidad de su operación.
El objetivo del presente trabajo es realizar un análisis de las características y potencial de la tecnología SDN, aplicada a la administración y mantenimiento de redes de datos. Y realizar un prototipo funcional de una interfaz de usuario, capaz de mostrar la topología de una red y permitir realizar cambios en su funcionamiento de forma centralizada. Finalizando con la resolución de algunos problemas típicos en las redes a través del uso de esta tecnología.
Tesis digitalizada en SEDICI gracias a la colaboración de la Biblioteca de la Facultad de Informática.
Facultad de Informática
Advisors/Committee Members: Venosa, Paula, Barbieri, Andrés.
Subjects/Keywords: Ciencias Informáticas; software; administración centralizada de redes; arquitectura de red; Frenetic; Link Layer Discovery Protocol; NetKat; OpenFlow; plano de aplicación; plano de control; plano de datos; políticas de red; SDN; Software Defined Networks; tabla de flujos; topología de red
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APA ·
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Manager
APA (6th Edition):
Barreto, M. (2017). Evaluación de tecnología SDN. (Thesis). Universidad Nacional de La Plata. Retrieved from http://sedici.unlp.edu.ar/handle/10915/67011
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Barreto, Marcelo. “Evaluación de tecnología SDN.” 2017. Thesis, Universidad Nacional de La Plata. Accessed February 28, 2021.
http://sedici.unlp.edu.ar/handle/10915/67011.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barreto, Marcelo. “Evaluación de tecnología SDN.” 2017. Web. 28 Feb 2021.
Vancouver:
Barreto M. Evaluación de tecnología SDN. [Internet] [Thesis]. Universidad Nacional de La Plata; 2017. [cited 2021 Feb 28].
Available from: http://sedici.unlp.edu.ar/handle/10915/67011.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barreto M. Evaluación de tecnología SDN. [Thesis]. Universidad Nacional de La Plata; 2017. Available from: http://sedici.unlp.edu.ar/handle/10915/67011
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
11.
James Pereira Souto, Eduardo.
Arquiteturas Cross-layer para Redes de Sensores sem Fio
.
Degree: 2007, Universidade Federal de Pernambuco
URL: http://repositorio.ufpe.br/handle/123456789/2050
► Em redes de sensores sem fio, a maioria dos protocolos de comunicação propostos explora a natureza colaborativa dos nós sensores e, geralmente, visa a utilização…
(more)
▼ Em redes de sensores sem fio, a maioria dos protocolos de comunicação propostos
explora a natureza colaborativa dos nós sensores e, geralmente, visa a utilização
eficiente dos recursos, principalmente em relação ao consumo de energia e
processamento. Comum a todas essas soluções é o fato de que essas redes também são
projetadas sobre a tradicional arquitetura de protocolos em camada, ou seja, a maioria
desses protocolos de comunicação é individualmente desenvolvida para as diferentes
camadas de rede. Enquanto estes protocolos podem alcançar um bom desempenho em
termos das métricas relativas a cada uma dessas camadas, estes não são otimizados de
maneira integrada para maximizar o desempenho da rede como um todo, enquanto
minimizam a quantidade de energia consumida. Considerando os recursos escassos das
redes de sensores, o projeto integrado das camadas de rede, isto é, o projeto crosslayer,
se apresenta como uma alternativa promissora para a ineficiência das tradicionais
arquiteturas de protocolos em camadas.
Neste contexto, este trabalho discute as arquiteturas cross-
layer existentes e
propõe uma nova arquitetura de rede, denominada Arquitetura de Rede Orientada a
Aspecto (AONA - Aspect-Oriented Network Architecture). Ao invés da comunicação entre
as camadas ser estritamente entre protocolos adjacentes, a AONA permite a
comunicação direta entre protocolos (comunicação cross-
layer) através da introdução de
um novo mecanismo de abstração, o aspecto. Esse mecanismo permite à arquitetura de
rede proposta o compartilhamento de informações e, ao mesmo tempo, garante a
modularização de interesses que estão dispersos nas diferentes camadas como energia,
segurança, tolerância a falhas ou outros requisitos de QoS (Quality of Service).
Para demonstrar a viabilidade do uso dos conceitos propostos na arquitetura
AONA, um projeto integrado entre as camadas de controle de acesso ao meio (MAC) e de
roteamento é construído sob uma pilha de protocolos especificamente desenvolvida para
redes de sensores. Os resultados obtidos mostram que a solução proposta melhora o
desempenho e o tempo de vida das redes de sensores quando comparada com a
abordagem tradicional (sem otimização cross-
layer).
Além de comprovar que a melhoria na eficiência das redes de sensores sem fio
pode ser obtida através do projeto de uma arquitetura cross-
layer, este trabalho propõe
que a AONA sirva como projeto genérico para as futuras arquiteturas de redes de
computadores, visto que fornece um melhor modelo de projeto e implementação para
arquiteturas de rede em termos de extensibilidade, adaptabilidade, reusabilidade e
reconfigurabilidade
Advisors/Committee Members: Kelner, Judith (advisor).
Subjects/Keywords: Arquitetura de redes de computadores;
Redes de sensores sem
fio;
Comunicação cross-layer;
Desenvolvimento de software orientado a aspectos
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
James Pereira Souto, E. (2007). Arquiteturas Cross-layer para Redes de Sensores sem Fio
. (Thesis). Universidade Federal de Pernambuco. Retrieved from http://repositorio.ufpe.br/handle/123456789/2050
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
James Pereira Souto, Eduardo. “Arquiteturas Cross-layer para Redes de Sensores sem Fio
.” 2007. Thesis, Universidade Federal de Pernambuco. Accessed February 28, 2021.
http://repositorio.ufpe.br/handle/123456789/2050.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
James Pereira Souto, Eduardo. “Arquiteturas Cross-layer para Redes de Sensores sem Fio
.” 2007. Web. 28 Feb 2021.
Vancouver:
James Pereira Souto E. Arquiteturas Cross-layer para Redes de Sensores sem Fio
. [Internet] [Thesis]. Universidade Federal de Pernambuco; 2007. [cited 2021 Feb 28].
Available from: http://repositorio.ufpe.br/handle/123456789/2050.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
James Pereira Souto E. Arquiteturas Cross-layer para Redes de Sensores sem Fio
. [Thesis]. Universidade Federal de Pernambuco; 2007. Available from: http://repositorio.ufpe.br/handle/123456789/2050
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Zitouni, Rafik.
Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable.
Degree: Docteur es, Informatique, 2015, Université Paris-Est
URL: http://www.theses.fr/2015PESC1126
► Le nombre croissant d'applications des Réseaux de Capteurs Sans Fils (RCSFs) a conduit les industriels à concevoir ces réseaux avec une couche Physique (PHY) suivant…
(more)
▼ Le nombre croissant d'applications des Réseaux de Capteurs Sans Fils (RCSFs) a conduit les industriels à concevoir ces réseaux avec une couche Physique (PHY) suivant le standard IEEE 802.15.4. Actuellement, cette couche est implémentée en matériel souffrant d'un manque de flexibilité du changement des paramètres radio, telles que bandes de fréquences et modulations. Ce problème est accentué par la rareté du spectre radio fréquences. La Radio Logiciel (RL) est une nouvelle solution pour reconfigurer plus facilement ces paramètres. A partir d'une RL, il est possible de développer une radio cognitive permettant une écoute de spectre et un Accès Dynamique au Spectre (ADS). Ces deux possibilités sont utiles pour surmonter le problème de la rareté du spectre. Cette thèse propose une nouvelle solution Radio logicielle pour un RCSF basé sur le standard IEEE 802.15.4. Notre objectif est de caractériser une plate-forme RL qui implémente à la fois deux couches PHY standardisées et une radio cognitive pour des RCSFs. Dans cette thèse, nous avons réalisé des implémentations RL en utilisant une plateforme composée de la solution Universal
Software Peripheral Radio (USRP) d'Ettus Research et de GNU Radio. Nous avons choisi cette plateforme particulière puisqu'elle est parmi les outils les plus performants et les plus pratiques d'après notre état de l'art. Une étude minutieuse a été effectuée pour analyser l'architecture logicielle de la GNU Radio avant son utilisation. Des USRPs avec leurs cartes filles ont été aussi analysés à travers des mesures expérimentales radio fréquences. L'analyse de cette plate-forme a apporté une description détaillée de son architecture et de ses performances. Nous avons prouvé que les performances mesurées sont plus faibles que ceux attendus pour certaines cartes filles d'USRP. Malgré ces résultats, certaines cartes ont de nombreuses caractéristiques intéressantes, comme de grandes bandes de fréquences couvertes et une puissance de sortie linéaire. Un modèle empirique a été introduit pour caractériser avec précision la puissance de sortie moyenne d'une carte fille particulière. Nous avons ensuite implémenté une nouvelle couche PHY standardisée pour la bande de fréquence 868/915 MHz basée sur le standard 802.15.4. Un processus de rétro-ingénierie d'une autre implémentation développée pour la bande 2.4GHz a été effectué. Ces deux couches ont été décrites par des chaines de communications ou des graphes de flux. Nous avons finalement proposé une nouvelle radio cognitive par une reconfiguration de ces graphes de flux dans les deux bandes de fréquences correspondantes. La particularité de notre radio cognitive est de reconfigurer les graphes de flux en fonction de la fréquence sélectionnée. Cette sélection est effectuée par un ADS et une écoute de spectre basé sur une détection d'énergie, validés tous les deux au travers des réelles communications sans fil. Nous avons introduit un algorithme à base de messages afin de reconfigurer les graphes de flux et de synchroniser la sélection sur une fréquence…
Advisors/Committee Members: George, Laurent (thesis director).
Subjects/Keywords: Radio logicielle; Réseaux de capteurs sans fil; Ieee 802.15.4; Radio cognitive; Couche Physique; Access dynamique au spectre; Software Defined Radio; Wireless Sensor Networks; Ieee 802.15.4; Cognitive Radio; Physical layer; Dynamic Spectrum Access
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APA (6th Edition):
Zitouni, R. (2015). Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2015PESC1126
Chicago Manual of Style (16th Edition):
Zitouni, Rafik. “Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable.” 2015. Doctoral Dissertation, Université Paris-Est. Accessed February 28, 2021.
http://www.theses.fr/2015PESC1126.
MLA Handbook (7th Edition):
Zitouni, Rafik. “Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable.” 2015. Web. 28 Feb 2021.
Vancouver:
Zitouni R. Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable. [Internet] [Doctoral dissertation]. Université Paris-Est; 2015. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2015PESC1126.
Council of Science Editors:
Zitouni R. Software defined radio for cognitive wireless sensor networks : a reconfigurable IEEE 802.15.4 reconfigurable : Radio logicielle pour des réseaux de capteurs sans fil cognitifs : un standard IEEE 802.15.4 reconfigurable. [Doctoral Dissertation]. Université Paris-Est; 2015. Available from: http://www.theses.fr/2015PESC1126
13.
Ryland, Kevin Sherwood.
Software-Defined Radio Implementation of Two Physical Layer Security Techniques.
Degree: MS, Electrical Engineering, 2018, Virginia Tech
URL: http://hdl.handle.net/10919/82055
► This thesis discusses the design of two Physical Layer Security (PLS) techniques on Software Defined Radios (SDRs). PLS is a classification of security methods that…
(more)
▼ This thesis discusses the design of two Physical
Layer Security (PLS) techniques on
Software Defined Radios (SDRs). PLS is a classification of security methods that take advantage of physical properties in the waveform or channel to secure communication. These schemes can be used to directly obfuscate the signal from eavesdroppers, or even generate secret keys for traditional encryption methods. Over the past decade, advancements in Multiple-Input Multiple-Output systems have expanded the potential capabilities of PLS while the development of technologies such as the Internet of Things has provided new applications. As a result, this field has become heavily researched, but is still lacking implementations. The design work in this thesis attempts to alleviate this problem by establishing SDR designs geared towards Over-the-Air experimentation.
The first design involves a 2x1 Multiple-Input Single-Output system where the transmitter uses Channel State Information from the intended receiver to inject Artificial Noise (AN) into the receiver's nullspace. The AN is consequently not seen by the intended receiver, however, it will interfere with eavesdroppers experiencing independent channel fading. The second design involves a single-carrier Alamouti coding system with pseudo-random phase shifts applied to each transmit antenna, referred to as Phase-Enciphered Alamouti Coding (PEAC). The intended receiver has knowledge of the pseudo-random sequence and can undo these phase shifts when performing the Alamouti equalization, while an eavesdropper without knowledge of the sequence will be unable to decode the signal.
Advisors/Committee Members: Clancy, Thomas Charles (committeechair), Dietrich, Carl B. (committee member), Buehrer, R. Michael (committee member).
Subjects/Keywords: Physical Layer Security; Software Defined Radio; Alamouti STBC; Artificial Noise; Over-the-Air
…Physical Layer Security[5]. . . . . . . . . . . . . . . . 30
4.1
An example wiretap… …security methods have become essential [10].
Physical Layer Security (PLS) is… …layer such as adaptively steering a
null towards an eavesdropper or simply beamforming in the… …occurred in Debian’s
OpenSSL in September of 2006 when a software patch restricted the psuedo… …techniques operate independently from the physical layer, making PLS
an easy option to augment…
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APA (6th Edition):
Ryland, K. S. (2018). Software-Defined Radio Implementation of Two Physical Layer Security Techniques. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/82055
Chicago Manual of Style (16th Edition):
Ryland, Kevin Sherwood. “Software-Defined Radio Implementation of Two Physical Layer Security Techniques.” 2018. Masters Thesis, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/82055.
MLA Handbook (7th Edition):
Ryland, Kevin Sherwood. “Software-Defined Radio Implementation of Two Physical Layer Security Techniques.” 2018. Web. 28 Feb 2021.
Vancouver:
Ryland KS. Software-Defined Radio Implementation of Two Physical Layer Security Techniques. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/82055.
Council of Science Editors:
Ryland KS. Software-Defined Radio Implementation of Two Physical Layer Security Techniques. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/82055
14.
Jagannath, Jithin.
Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks.
Degree: PhD, Department of Electrical and Computer Engineering, 2019, Northeastern University
URL: http://hdl.handle.net/2047/D20323954
► The exponential growth of devices that rely on wireless communication to operate has introduced significant stress on the limited resources. Additionally, to offset the cost…
(more)
▼ The exponential growth of devices that rely on wireless communication to operate has introduced significant stress on the limited resources. Additionally, to offset the cost of installing new infrastructure and to maximize revenue, 5G (5th Generation) network providers are expected to extend their services beyond traditional cellular communication to support Internet-of-Things (IoT) and machine-to-machine ad hoc communication. To accommodate all these devices over the next decade, there are two key research directions that need to be adopted; (i) optimizing the use of available resources to meet the application-specific quality of service (QoS) requirements and (ii) develop technology that enables the utilization of unexplored and unlicensed parts of the spectrum to complement the current radio frequency (RF) based networks. This work focuses on how cross-layer optimized algorithms can be the answer to both these requirements for the next-generation of 5G network. First, cross-layer optimization is employed to enable both tactical and emergency ad hoc networks to meet their specific requirements. To this end, a Deadline-based cross-layer Routing and Spectrum allocation (DRS) algorithm is proposed for tactical ad hoc networks to handle the heterogeneous nature of traffic. This work also puts forth a cross-layer architecture that will enable implementation and evaluation of such cross-layer optimized routing algorithms. The proposed solution is evaluated on a software-defined radio (SDR) testbed and shown to outperform state-of-the-art routing algorithms. Next, to aid modern emergency response, a low cost Heterogeneous Efficient Low PowEr Radio (HELPER) network is designed and developed to provide complete end-to-end connectivity for both survivors and first responders. This is realized by designing an energy-aware routing algorithm that aims to maximize network lifetime. The operational feasibility of the proposed HELPER network is demonstrated by developing HELPER prototype using Commercial-Off-The-Shelf (COTS) components. Thereafter, extensive quantitative evaluation is performed on the developed HELPER testbed. Visible Light Communication (VLC) is envisioned as a major 5G technology that can be complementary to RF and help mitigate the congestion in the RF spectrum. Visible Light Ad Hoc Networks (LANET) have the potential to offer capabilities to satisfy growing industrial and military requirements, including low-latency, high bandwidth communication under high network density. The challenges imposed by hidden nodes, deafness and blockage are unique to LANET and influence the network differently from traditional Mobile Ad Hoc Networks (MANET) due to directionality and Line of Sight (LOS) requirements. Therefore, networking protocols have to be redesigned with careful consideration of these challenges. These unique challenges demand consideration of networking problems from the cross-layer perspective. As a significant step in realizing LANETs, this work first proposes an opportunistic Medium Access Control (MAC)…
Subjects/Keywords: 5G; Cross-layer optimization; networking; software defined radio; visible light communication; Engineering
…ART Availability Request
AODV Ad hoc On-Demand Distance Vector
AXL Adaptive Cross-Layer
BD… …CMS Control Micro-Slots
COmBAT CrOss-layer Based testbed with Analysis Tool
CSMA/CA Carrier… …Arrival
DoD Department Of Defense
DRS Deadline-based cross-layer Routing and Spectrum allocation… …minimum Contention Window
SDR Software Defined Radio
SH Static HELPER
S-IDLE Synchronous Idle… …Transceiving State
UHD Universal Hardware Driver
USRP Universal Software Radio Peripheral
UV…
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APA ·
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APA (6th Edition):
Jagannath, J. (2019). Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20323954
Chicago Manual of Style (16th Edition):
Jagannath, Jithin. “Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks.” 2019. Doctoral Dissertation, Northeastern University. Accessed February 28, 2021.
http://hdl.handle.net/2047/D20323954.
MLA Handbook (7th Edition):
Jagannath, Jithin. “Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks.” 2019. Web. 28 Feb 2021.
Vancouver:
Jagannath J. Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks. [Internet] [Doctoral dissertation]. Northeastern University; 2019. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2047/D20323954.
Council of Science Editors:
Jagannath J. Cross-layer Optimized Networking For Next-generation 5g Ad Hoc Networks. [Doctoral Dissertation]. Northeastern University; 2019. Available from: http://hdl.handle.net/2047/D20323954
15.
Frank José Affonso.
Reengenharia de interfaces utilizando Wrapping.
Degree: 2003, Universidade Federal de São Carlos
URL: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=198
► Com a evolução tecnológica e com a crescente utilização da Internet, empresas e instituições governamentais desejam migrar seus sistemas desenvolvidos com recursos computacionais antigos (legados)…
(more)
▼ Com a evolução tecnológica e com a crescente utilização da Internet, empresas e instituições governamentais desejam migrar seus sistemas desenvolvidos com recursos computacionais antigos (legados) para mais modernos. No entanto, essa é uma tarefa que requer investimentos elevados, podendo o processo de reengenharia ser utilizado nesses casos. Uma forma de modificar esses sistemas é por meio da reengenharia da sua interface, através do empacotamento de sua lógica (wrapping). Essa técnica preserva o ambiente nativo do sistema e suas funcionalidades, reduzindo em tempo e custo o processo de reengenharia. Para apoiar a migração de sistemas legados propõe-se um Processo de Reengenharia de Interface (PRI) que apóia a migração de sistemas legados de maneira geral, realizando o empacotamento de suas funcionalidades e acoplando uma nova interface do usuário para Web. A nova interface do usuário será disponibilizada para Web, que se comunica com os componentes identificados no sistema legado de acordo com os recursos especiais que eles oferecem. O PRI resume-se no estudo da interface e da lógica do sistema. Com isso, pode-se realizar a organização do sistema para que seja realizado seu empacotamento, que corresponde ao revestimento das funcionalidades legadas por uma camada de software, viabilizando a comunicação com a nova interface do usuário, desenvolvida segundo critérios de usabilidade. Os sistemas utilizados como estudo de casos são desenvolvidos no ambiente Delphi com ou sem características da orientação a objetos. Neste trabalho somente os desenvolvidos sem características da orientação a objetos são apresentados em detalhes. Com a aplicação desse processo, somente a interface passa a ser desenvolvida em um outro paradigma, mas o código legado permanece como o original, facilitando a tarefa dos mantenedores do sistema.
With the technological evolution and the increasing utilization of the Internet, companies and governmental institutions have been looking for modern solution to replace and improve their legacy systems. These kind of solutions require high investments, being able to use the reengineering process in these cases. A maner to modify these systems is through reengineering of their interfaces, by wrapping of their logic. This technique preserves the native environment of system and its functionalities, reducing in time and cost the reengineering process. To support the migration of legacies systems in a general way, there is an Interface Reengineering Process (IRP), whose accomplish the wrapping of its functionalities and connect them with a new user Web interface. This Web interface connects itself with the identified components of the legacy system following the special resources that they offer. The IRP is summarized by the study of the interface and logic of the system. In this way, it possible to accomplish the system organization for the wrapping to be done, which is composed by the legacies functionalities covered by a new software layer. This new layer makes possible the communication with the new…
Advisors/Committee Members: Rosângela Aparecida Dellosso Penteado.
Subjects/Keywords: Engenharia de software; CIENCIA DA COMPUTACAO; Reengenharia de interfaces; Sistema legado; Componentes de software; Técnicas de empacotamento; World Wide Web (sistema de recuperação da informação); Usabilidade; Camada de software; Interface reengineering; Wrapping technique; Legacy systems; Usability; Software layer; Software component; Web
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APA (6th Edition):
Affonso, F. J. (2003). Reengenharia de interfaces utilizando Wrapping. (Thesis). Universidade Federal de São Carlos. Retrieved from http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=198
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Affonso, Frank José. “Reengenharia de interfaces utilizando Wrapping.” 2003. Thesis, Universidade Federal de São Carlos. Accessed February 28, 2021.
http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=198.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Affonso, Frank José. “Reengenharia de interfaces utilizando Wrapping.” 2003. Web. 28 Feb 2021.
Vancouver:
Affonso FJ. Reengenharia de interfaces utilizando Wrapping. [Internet] [Thesis]. Universidade Federal de São Carlos; 2003. [cited 2021 Feb 28].
Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=198.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Affonso FJ. Reengenharia de interfaces utilizando Wrapping. [Thesis]. Universidade Federal de São Carlos; 2003. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=198
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Zhang, Xinyu.
MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios.
Degree: PhD, Computer Science & Engineering, 2012, University of Michigan
URL: http://hdl.handle.net/2027.42/95944
► In the past decade, CSMA-based protocols have spawned numerous network standards (e.g., the WiFi family), and played a key role in improving the ubiquity of…
(more)
▼ In the past decade, CSMA-based protocols have spawned numerous network standards (e.g., the WiFi family), and played a key role in improving the ubiquity of wireless networks. However, the rapid evolution of CSMA brings unprecedented challenges, especially the coexistence of different network architectures and communications devices. Meanwhile, many intrinsic limitations of CSMA have been the main obstacle to the performance of its derivatives, such as ZigBee, WiFi, and mesh networks. Most of these problems are observed to root in the abstract interface of the CSMA MAC and PHY layers – the MAC simply abstracts the advancement of PHY technologies as a change of data rate. Hence, the benefits of new PHY technologies are either not fully exploited, or they even may harm the performance of existing network protocols due to poor interoperability.
In this dissertation, we show that a joint design of the MAC/PHY layers can achieve a substantially higher level of capacity, interoperability and energy efficiency than the weakly coupled MAC/PHY design in the current CSMA wireless networks. In the proposed MAC/PHY co-design, the PHY
layer exposes more states and capabilities to the MAC, and the MAC performs intelligent adaptation to and control over the PHY
layer. We leverage the reconfigurability of
software radios to design smart signal processing algorithms that meet the challenge of making PHY capabilities usable by the MAC
layer. With the approach of MAC/PHY co-design, we have revisited the primitive operations of CSMA (collision avoidance, carrier signaling, carrier sensing, spectrum access and transmitter cooperation), and overcome its limitations in relay and broadcast applications, coexistence of heterogeneous networks, energy efficiency, coexistence of different spectrum widths, and scalability for MIMO networks. We have validated the feasibility and performance of our design using extensive analysis, simulation and testbed implementation.
Advisors/Committee Members: Shin, Kang Geun (committee member), Anastasopoulos, Achilleas (committee member), Dutta, Prabal (committee member), Noble, Brian D. (committee member).
Subjects/Keywords: MAC and PHY Layer; Protocol and Algorithm Design; Cross-layer Design or Co-design; Software Radio; Wireless Networks; WiFi, ZigBee; Computer Science; Engineering
…layer. We leverage the reconfigurability of software radios to design
smart signal processing… …usable by the MAC layer. We have used software radios extensively to design smart signal… …WiFi radio . . . . . . . . . . . . .
5.3.2 Software radio . . . . . . . . . . .
An Overview… …32
2.6
The MAC layer control flow in CSMA/CR. seq’ denotes the sequence
number of the… …ABSTRACT
MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios
by
Xinyu Zhang
Chair…
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APA (6th Edition):
Zhang, X. (2012). MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/95944
Chicago Manual of Style (16th Edition):
Zhang, Xinyu. “MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios.” 2012. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021.
http://hdl.handle.net/2027.42/95944.
MLA Handbook (7th Edition):
Zhang, Xinyu. “MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios.” 2012. Web. 28 Feb 2021.
Vancouver:
Zhang X. MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios. [Internet] [Doctoral dissertation]. University of Michigan; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2027.42/95944.
Council of Science Editors:
Zhang X. MAC/PHY Co-Design of CSMA Wireless Networks Using Software Radios. [Doctoral Dissertation]. University of Michigan; 2012. Available from: http://hdl.handle.net/2027.42/95944
University of Texas – Austin
17.
Ulerich, Rhys David.
Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.
Degree: PhD, Computational Science, Engineering, and Mathematics, 2014, University of Texas – Austin
URL: http://hdl.handle.net/2152/26886
► Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station…
(more)
▼ Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station have been studied by direct numerical simulation, with the ultimate goal of reducing aerothermodynamic heating prediction uncertainty. Simulations were performed using a new, well-verified, openly available Fourier/B-spline pseudospectral code called Suzerain equipped with a ``slow growth'' spatiotemporal homogenization approximation recently developed by Topalian et al. A first study aimed to reduce turbulence-driven heating prediction uncertainty by providing high-quality data suitable for calibrating Reynolds-averaged Navier – Stokes turbulence models to address the atypical boundary
layer characteristics found in such reentry problems. The two data sets generated were Ma[approximate symbol] 0.9 and 1.15 homogenized boundary layers possessing Re[subscript theta, approximate symbol] 382 and 531, respectively. Edge-to-wall temperature ratios, T[subscript e]/T[subscript w], were close to 4.15 and wall blowing velocities, v[subscript w, superscript plus symbol]= v[subscript w]/u[subscript tau], were about 8 x 10-3 . The favorable pressure gradients had Pohlhausen parameters between 25 and 42. Skin frictions coefficients around 6 x10-3 and Nusselt numbers under 22 were observed. Near-wall vorticity fluctuations show qualitatively different profiles than observed by Spalart (J. Fluid Mech. 187 (1988)) or Guarini et al. (J. Fluid Mech. 414 (2000)). Small or negative displacement effects are evident. Uncertainty estimates and Favre-averaged equation budgets are provided. A second study aimed to reduce transition-driven uncertainty by determining where on the thermal protection system surface the boundary
layer could sustain turbulence. Local boundary
layer conditions were extracted from a laminar flow solution over the MPCV which included the bow shock, aerothermochemistry, heat shield surface curvature, and ablation. That information, as a function of leeward distance from the stagnation point, was approximated by Re[subscript theta], Ma[subscript e], [mathematical equation], v[subscript w, superscript plus sign], and T[subscript e]/T[subscript w] along with perfect gas assumptions. Homogenized turbulent boundary layers were initialized at those local conditions and evolved until either stationarity, implying the conditions could sustain turbulence, or relaminarization, implying the conditions could not. Fully turbulent fields relaminarized
subject to conditions 4.134 m and 3.199 m leeward of the stagnation point. However, different initial conditions produced long-lived fluctuations at leeward position 2.299 m. Locations more than 1.389 m leeward of the stagnation point are predicted to sustain turbulence in this scenario.
Advisors/Committee Members: Moser, Robert deLancey (advisor).
Subjects/Keywords: Atmospheric reentry; B-spline collocation; Channel flow; Cold wall; Direct numerical simulation; Energy perturbation method; Favorable pressure gradient; Flat plate; Homogenized boundary layer; Inviscid base flow; Isothermal wall; Low Reynolds number; Manufactured solution; NASA Orion; Negative displacement thickness; Predictive computation; Pseudospectral method; Radial nozzle; Reducing uncertainty; Reentry vehicle; Relaminarization; Sampling uncertainty; Simulation framework; Slow growth formulation; Software verification; Transition modeling; Turbulence budgets; Turbulent boundary layer; Wall blowing; Wall transpiration
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APA ·
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APA (6th Edition):
Ulerich, R. D. (2014). Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26886
Chicago Manual of Style (16th Edition):
Ulerich, Rhys David. “Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed February 28, 2021.
http://hdl.handle.net/2152/26886.
MLA Handbook (7th Edition):
Ulerich, Rhys David. “Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.” 2014. Web. 28 Feb 2021.
Vancouver:
Ulerich RD. Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2152/26886.
Council of Science Editors:
Ulerich RD. Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26886
18.
Ghasemiahmadi, Mohammad.
Efficient wireless transmission supporting internet of things.
Degree: Department of Electrical and Computer Engineering, 2017, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/8888
► The promise of Internet of Things (IoT) and mass connectivity has brought many applications and along with them many new challenges to be solved. Recognizing…
(more)
▼ The promise of Internet of Things (IoT) and mass connectivity has brought many applications and along with them many new challenges to be solved. Recognizing sensor networks as one of the main applications of IoT, this dissertation focuses on solutions for IoT challenges in both single-hop and multi-hop communications. In single-hop communications, the new IEEE 802.11ah and its Group Synchronized Distribution Coordination Function (GS-DCF) is studied. GS-DCF categorized nodes in multiple groups to solve the channel contention issue of dense networks. An RSS-Based grouping strategy is proposed for the hidden terminal problem that can arise in infrastructure-based single hop communications. For multi-hop communications, Physical
Layer Network Coding (PNC) is studied as a robust solution for multi-hop packet exchange in linear networks. Focusing on practical and implementation issues of PNC systems, different challenges have been addressed and a
Software Defined Radio (SDR) PNC system based on USRP devices is proposed and implemented. Finally, extensive simulation and experimental results are presented to evaluate the performance of the proposed algorithms in comparison with currently used methods.
Advisors/Committee Members: Cai, Lin (supervisor).
Subjects/Keywords: Internet of Things; wireless communication; physical layer network coding; IEEE 802.11ah; grouping; software defined radio; usrp; gnuradio
…standard,
hidden terminal problem, physical layer network coding and software defined
radio.
5… …implementation of physical layer network coding
technology on software defined radio platform and how… …addition to the physical layer solutions trying to make wireless communications more efficient… …and faster, a key issue is how to modify the DCF protocol in
the MAC layer to achieve better… …technology is Physical Layer Network
Coding (PNC). It can present a robust solution for…
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APA (6th Edition):
Ghasemiahmadi, M. (2017). Efficient wireless transmission supporting internet of things. (Masters Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/8888
Chicago Manual of Style (16th Edition):
Ghasemiahmadi, Mohammad. “Efficient wireless transmission supporting internet of things.” 2017. Masters Thesis, University of Victoria. Accessed February 28, 2021.
https://dspace.library.uvic.ca//handle/1828/8888.
MLA Handbook (7th Edition):
Ghasemiahmadi, Mohammad. “Efficient wireless transmission supporting internet of things.” 2017. Web. 28 Feb 2021.
Vancouver:
Ghasemiahmadi M. Efficient wireless transmission supporting internet of things. [Internet] [Masters thesis]. University of Victoria; 2017. [cited 2021 Feb 28].
Available from: https://dspace.library.uvic.ca//handle/1828/8888.
Council of Science Editors:
Ghasemiahmadi M. Efficient wireless transmission supporting internet of things. [Masters Thesis]. University of Victoria; 2017. Available from: https://dspace.library.uvic.ca//handle/1828/8888
Karlstad University
19.
Hjern, Gunnar.
The modernization of a DOS-basedtime critical solar cell LBICmeasurement system.
Degree: Karlstad University, 2019, Karlstad University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322
► LBIC is a technique for scanning the local quantum efficiency of solar cells. This kind of measurements needs a highly specialized, and time critical…
(more)
▼ LBIC is a technique for scanning the local quantum efficiency of solar cells. This kind of measurements needs a highly specialized, and time critical controlling software. In 1996 the client, professor Markus Rinio, constructed an LBIC system, and wrote the controlling software as a Turbo-Pascal 7.0 application, running under the MS-DOS 6.22 operating system. By now (2018) both the software and several hardware components are in dire need to be modernized. This thesis thoroughly describes several important aspects of this work, and the considerations needed for a successful result. This includes both very foundational choices about the software architecture, the choice of suitable operating system, the threading model, and the adaptation to new hardware with vastly different behavior. The project also included a new hardware module for position reports and instrument triggering, as well as several adaptations to transform the DOS-based LBIC software into a pleasant modern GUI application.
Subjects/Keywords: Pascal programming language; Linux; operating system; real-time; PREEMPT_RT patch; Free Pascal compiler; Lazarus; multi-threading; computer controlled measurements; false color map; refactoring; software modernization; adaptation layer; MS-DOS; GPIB; IEEE-488; silicon solar cell; quantum efficiency; LBIC; electron recombination; serial communication; micro-controller; ISR; incremental encoder; lock-in amplifier; trans-impedance amplifier; triggered measurement; Computer and Information Sciences; Data- och informationsvetenskap
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APA (6th Edition):
Hjern, G. (2019). The modernization of a DOS-basedtime critical solar cell LBICmeasurement system. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hjern, Gunnar. “The modernization of a DOS-basedtime critical solar cell LBICmeasurement system.” 2019. Thesis, Karlstad University. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hjern, Gunnar. “The modernization of a DOS-basedtime critical solar cell LBICmeasurement system.” 2019. Web. 28 Feb 2021.
Vancouver:
Hjern G. The modernization of a DOS-basedtime critical solar cell LBICmeasurement system. [Internet] [Thesis]. Karlstad University; 2019. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hjern G. The modernization of a DOS-basedtime critical solar cell LBICmeasurement system. [Thesis]. Karlstad University; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Min, Menglei.
Evaluation and Implementation for Pushing Automatic Updates to IoT Devices.
Degree: Information Systems and Technology, 2017, Mid Sweden University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31483
► In recent years, Internet of Things has developed rapidly, and now has penetrated into human life and industrial production. It is speculated that the…
(more)
▼ In recent years, Internet of Things has developed rapidly, and now has penetrated into human life and industrial production. It is speculated that the internet of things will become ubiquitous in the future, which will bring a series of problems. First, the large number of things will lead to operated system and software updates consuming a lot of manpower and resources. Another problem is the Internet of things facing security issues, in recent years for the means of Internet of things and tools have been increasing largely. Therefore, to achieve a secure automatic update on the Internet of Things is essential. This report will follow such an automatic update system based on Internet of things to expand. First it elaborated on the main motive of this problem, found three existing related works and three security methods for communication to analyze. Then combined results of analysis, put forward own a secure automatic update solution: manager and devices connect and mutual authentication in real time, at the same time, the manager will regularly check the database to see if there is new version application. When the administrator uploads a new version, the manager will download the version and then sends to all devices, then device installs and finally restart itself. Next, the report described how to implement this system in detail and evaluated it. In the end, this report summarized and introduces the future work.
Subjects/Keywords: Automatic update; Internet of things; Digital signature; Secure sockets layer communication; Secure hash algorithm; Software Engineering; Programvaruteknik
…Min
2017-06-8
TCP/IP
Transmission Control Protocol/Internet Protocol
TLS
Transport Layer… …published some laws and regulations of digital signature.
2.2.3
Secure Sockets Layer… …case the
content will be easily intercepted by eavesdroppers.
Secure Sockets Layer… …subsequent version TLS (Transport Layer Security) are
relatively mature secure… …software update
Dynamic software update is abbreviated as DSU. DSU refers to the
research field…
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APA (6th Edition):
Min, M. (2017). Evaluation and Implementation for Pushing Automatic Updates to IoT Devices. (Thesis). Mid Sweden University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31483
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Min, Menglei. “Evaluation and Implementation for Pushing Automatic Updates to IoT Devices.” 2017. Thesis, Mid Sweden University. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Min, Menglei. “Evaluation and Implementation for Pushing Automatic Updates to IoT Devices.” 2017. Web. 28 Feb 2021.
Vancouver:
Min M. Evaluation and Implementation for Pushing Automatic Updates to IoT Devices. [Internet] [Thesis]. Mid Sweden University; 2017. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Min M. Evaluation and Implementation for Pushing Automatic Updates to IoT Devices. [Thesis]. Mid Sweden University; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31483
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
O'Shea, Timothy James.
Learning from Data in Radio Algorithm Design.
Degree: PhD, Electrical Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/89649
► Algorithm design methods for radio communications systems are poised to undergo a massive disruption over the next several years. Today, such algorithms are typically designed…
(more)
▼ Algorithm design methods for radio communications systems are poised to undergo a massive disruption over the next several years. Today, such algorithms are typically designed manually using compact analytic problem models. However, they are shifting increasingly to machine learning based methods using approximate models with high degrees of freedom, jointly optimized over multiple subsystems, and using real-world data to drive design which may have no simple compact probabilistic analytic form.
Over the past five years, this change has already begun occurring at a rapid pace in several fields. Computer vision tasks led deep learning, demonstrating that low level features and entire end-to-end systems could be learned directly from complex imagery datasets, when a powerful collection of optimization methods, regularization methods, architecture strategies, and efficient implementations were used to train large models with high degrees of freedom.
Within this work, we demonstrate that this same class of end-to-end deep neural network based learning can be adapted effectively for physical
layer radio systems in order to optimize for sensing, estimation, and waveform synthesis systems to achieve state of the art levels of performance in numerous applications.
First, we discuss the background and fundamental tools used, then discuss effective strategies and approaches to model design and optimization. Finally, we explore a series of applications across estimation, sensing, and waveform synthesis where we apply this approach to reformulate classical problems and illustrate the value and impact this approach can have on several key radio algorithm design problems.
Advisors/Committee Members: Clancy, Thomas Charles (committeechair), McGwier, Robert W. (committee member), Reed, Jeffrey H. (committee member), Ramakrishnan, Naren (committee member), Raman, Sanjay (committee member).
Subjects/Keywords: deep learning; radio; physical layer; software radio; machine learning; neural networks; sensing; communications system design; modulation; coding; sensing
…peak to average power ratio
PCA principal component analysis
PHY physical layer
PPM parts per… …network
SCF spectral correlation function
SDR software-defined radio
SGD stochastic gradient… …SNE t-distributed stochastic neighbor embedding
TS time-slotted
USRP universal software… …convolutional layer . . . . . . . . . . . . . . . . . 31
2.5
A sequence of 2D convolutional layers… …45
2.15 Layer 1 and 2 filter weights from CNN trained on ImageNet, from [9]…
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APA (6th Edition):
O'Shea, T. J. (2017). Learning from Data in Radio Algorithm Design. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89649
Chicago Manual of Style (16th Edition):
O'Shea, Timothy James. “Learning from Data in Radio Algorithm Design.” 2017. Doctoral Dissertation, Virginia Tech. Accessed February 28, 2021.
http://hdl.handle.net/10919/89649.
MLA Handbook (7th Edition):
O'Shea, Timothy James. “Learning from Data in Radio Algorithm Design.” 2017. Web. 28 Feb 2021.
Vancouver:
O'Shea TJ. Learning from Data in Radio Algorithm Design. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10919/89649.
Council of Science Editors:
O'Shea TJ. Learning from Data in Radio Algorithm Design. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/89649
22.
Gerzaguet, Robin.
Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture.
Degree: Docteur es, Signal, image, paroles, télécoms, 2015, Université Grenoble Alpes (ComUE)
URL: http://www.theses.fr/2015GREAT014
► Les émetteurs-récepteurs actuels tendent à devenir multi-standards c’est-àdireque plusieurs standards de communication peuvent cohabiter sur la même puce. Lespuces sont donc amenées à traiter des…
(more)
▼ Les émetteurs-récepteurs actuels tendent à devenir multi-standards c’est-àdireque plusieurs standards de communication peuvent cohabiter sur la même puce. Lespuces sont donc amenées à traiter des signaux de formes très différentes, et les composantsanalogiques subissent des contraintes de conception de plus en plus fortes associées au supportdes différentes normes. Les auto-interférences, c’est à dire les interférences généréespar le système lui-même, sont donc de plus en plus présentes, et de plus en plus problématiquesdans les architectures actuelles. Ces travaux s’inscrivent dans le paradigmede la « radio sale » qui consiste à accepter une pollution partielle du signal d’intérêtet à réaliser, par l’intermédiaire d’algorithmes, une atténuation de l’impact de ces pollutionsauto-générées. Dans ce manuscrit, on s’intéresse à différentes auto-interférences(phénomène de "spurs", de "Tx leakage", ...) dont on étudie les modèles numériques etpour lesquelles nous proposons des stratégies de compensation. Les algorithmes proposéssont des algorithmes de traitement du signal adaptatif qui peuvent être vus comme des« algorithmes de soustraction de bruit » basés sur des références plus ou moins précises.Nous dérivons analytiquement les performances transitionnelles et asymptotiques théoriquesdes algorithmes proposés. On se propose également d’ajouter à nos systèmes unesur-couche originale qui permet d’accélérer la convergence, tout en maintenant des performancesasymptotiques prédictibles et paramétrables. Nous validons enfin notre approchesur une puce dédiée aux communications cellulaires ainsi que sur une plateforme de radiologicielle.
Radio frequency transceivers are now massively multi-standards, which meansthat several communication standards can cohabit in the same environment. As a consequence,analog components have to face critical design constraints to match the differentstandards requirements and self-interferences that are directly introduced by the architectureitself are more and more present and detrimental. This work exploits the dirty RFparadigm : we accept the signal to be polluted by self-interferences and we develop digitalsignal processing algorithms to mitigate those aforementioned pollutions and improve signalquality. We study here different self-interferences and propose baseband models anddigital adaptive algorithms for which we derive closed form formulae of both transientand asymptotic performance. We also propose an original adaptive step-size overlay toimprove transient performance of our method. We finally validate our approach on a systemon chip dedicated to cellular communications and on a software defined radio.
Advisors/Committee Members: Brossier, Jean-Marc (thesis director), Ros, Laurent (thesis director), Belvèze, Fabrice (thesis director).
Subjects/Keywords: Radio sale; Terminaux multi-standard; Couche physique; Auto-interférences; Traitement numérique du signal; Performances asymptotiques et transitionnelles; Algorithmes adaptatifs; Spurs; Gradient stochastique; Tx leakage; Radio logicielle; Dirty RF; Multi-standard transceivers; Physical layer; Self-interference; Direct conversion receiver; Digital signal processing; Asymptotic and transient performance; Adaptive algorithms; Spur; Tx Leakage; Joint estimation; Software defined radio; 620
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APA ·
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APA (6th Edition):
Gerzaguet, R. (2015). Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2015GREAT014
Chicago Manual of Style (16th Edition):
Gerzaguet, Robin. “Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture.” 2015. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed February 28, 2021.
http://www.theses.fr/2015GREAT014.
MLA Handbook (7th Edition):
Gerzaguet, Robin. “Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture.” 2015. Web. 28 Feb 2021.
Vancouver:
Gerzaguet R. Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2015. [cited 2021 Feb 28].
Available from: http://www.theses.fr/2015GREAT014.
Council of Science Editors:
Gerzaguet R. Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile : Digital processing for auto-interference cancellation in mobile architecture. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2015. Available from: http://www.theses.fr/2015GREAT014
23.
Buzo, Amir.
Intelligent Data Layer: : An approach to generating data layer from normalized database model.
Degree: Physics and Mathematics, 2012, Linnaeus University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22170
► Model View Controller (MVC) software architecture is widely spread and commonly used in application’s development. Therefore generation of data layer for the database model…
(more)
▼ Model View Controller (MVC) software architecture is widely spread and commonly used in application’s development. Therefore generation of data layer for the database model is able to reduce cost and time. After research on current Object Relational Mapping (ORM) tools, it was discovered that there are generating tools like Data Access Object (DAO) and Hibernate, however their usage causes problems like inefficiency and slow performance due to many connections with database and set up time. Most of these tools are trying to solve specific problems rather than generating a data layer which is an important component and the bottom layer of database centred applications. The proposed solution to the problem is an engineering approach where we have designed a tool named Generated Intelligent Data Layer (GIDL). GIDL tool generates small models which create the main data layer of the system according to the Database Model. The goal of this tool is to enable and allow software developers to work only with object without deep knowledge in SQL. The problem of transaction and commit is solved by the tool. Also filter objects are constructed for filtering the database. GIDL tool reduced the number of connections and also have a cache where to store object lists and modify them. The tool is compared under the same environment with Hibernate and showed a better performance in terms of time evaluations for the same functions. GIDL tool is beneficial for software developers, because it generates the entire data layer.
Subjects/Keywords: Object Relational Mapping (ORM); Generated Intelligent Data Layer (GIDL); Relational Database; Microsoft SQL Server; Object Oriented Design Pattern; Model; Model View Controller; High Query Language; Structured Query Language (SQL) and Data Layer.; Software Engineering; Programvaruteknik; Computer Sciences; Datavetenskap (datalogi)
…development phase in software life cycle, it is noticed that design of the data
layer of a system… …small models are
generated by a software tool named Generated Intelligent Data Layer (… …layer and the generation of such a layer would really facilitate software
developers during… …software architecture is widely spread and the generation of
data layer for the main model will… …theories.
O2. Define Software Requirements of data layer, pre and post condition.
O3. Design…
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APA (6th Edition):
Buzo, A. (2012). Intelligent Data Layer: : An approach to generating data layer from normalized database model. (Thesis). Linnaeus University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22170
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Buzo, Amir. “Intelligent Data Layer: : An approach to generating data layer from normalized database model.” 2012. Thesis, Linnaeus University. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22170.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Buzo, Amir. “Intelligent Data Layer: : An approach to generating data layer from normalized database model.” 2012. Web. 28 Feb 2021.
Vancouver:
Buzo A. Intelligent Data Layer: : An approach to generating data layer from normalized database model. [Internet] [Thesis]. Linnaeus University; 2012. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22170.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Buzo A. Intelligent Data Layer: : An approach to generating data layer from normalized database model. [Thesis]. Linnaeus University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22170
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Μαλιάτσος, Κωνσταντίνος.
Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio).
Degree: 2011, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)
URL: http://hdl.handle.net/10442/hedi/26824
► Cognitive Radio is a new mobile and wireless communication system that has the ability to automatically and dynamically adapt the transmission and reception parameters with…
(more)
▼ Cognitive Radio is a new mobile and wireless communication system that has the ability to automatically and dynamically adapt the transmission and reception parameters with main objective the efficient utilization of radio resources while providing high speed and reliable services. The capacity to adjust the used waveform in a heterogeneous radio environment and the need for harmonic coexistence with conventional radio systems opens a wide range of research challenges and capabilities. This doctoral thesis deals with a variety of issues in Cognitive Radio adaptive waveform design and receiver algorithms for signal analysis. While focusing mainly on the signal processing aspects of the reconfigurable physical layer that opportunistically uses the spectrum the research effort reaches the Medium Access Control sublayer. First an introduction to concepts principles and definitions of Cognitive Radio and its fully reconfigurable hardware the Software Defined Radio is made Multirate signal processing and filter bank theory were studied as a means to develop computationally efficient real-time analysis algorithms. Since OFDM modulation is the most popular choice for the Cognitive Radio waveform an extensive study of features weaknesses and limitations in the Cognitive Radio framework was made. In order to overcome the OFDM drawback of the interfering sidelobes a new Offset Windowed OFDM (OW-OFDM) waveform was designed as a creative mix of features from OFDM, OFDM-OQAM and signal shaping functions. In a next step the decision procedure for filterbank-based sensing was defined and practical algorithms were developed. The concept of Three State Sensing that gives the ability to the transceiver to recognize and classify the incoming signals as Cognitive or Primary waveforms was introduced and two methods of implementation were proposed by exploiting OFDM waveform characteristics. The combination of conclusions and results led to the design of a filter-bank based OFDM receiver architecture that protects the Cognitive Radio waveform from destructive interference while giving the ability to develop new algorithms. Therefore a new time and frequency synchronization scheme for non-contiguous OFDM waveforms under heavy interference was designed and evaluated through simulation. The research activities were concluded in the MAC layer where the Distributed Control Function was modified in order to match the specific features of the Spectrum Pooling environment. During the research effort some other issues were addressed such as automatic modulation recognition algorithm (with wavelet transform) and radio channel characterization and modeling.
Τα Γνωστικά Ραδιοσυστήματα είναι μια νέα τεχνολογία κινητών και ασυρμάτων επικοινωνιών που διαθέτει την ικανότητα να προσαρμόζει αυτόματα και δυναμικά τις παραμέτρους εκπομπής και λήψης με κύριο στόχο την αποδοτική χρησιμοποίηση των ραδιοπόρων με την ταυτόχρονη παροχή αξιόπιστων και ταχύτατων υπηρεσιών. Η ικανότητα προσαρμογής της χρησιμοποιούμενης κυματομορφής σε ένα ετερογενές…
Subjects/Keywords: Γνωστικά ραδιοσυστήματα; Γνωσιακά ραδιοσυστήματα; Ραδιοσυστήματα οριζόμενα από λογισμικό; Διαμορφώσεις πολλαπλών φερόντων; Φυσικό στρώμα; Υπόστρωμα πρόσβασης στο μέσο; Φασματική ανίχνευση; Φασματική ανίχνευση τριών καταστάσεων; Μοντελοποίηση ραδιοδιαύλου; Κυματομορφή; Ολίσθηση συχνότητας; Λειτουργία κατανεμημένου ελέγχου; Διακοπτόμενη λειτουργία; Ορθογωνική πολυπλεξία πολλαπλών φερόντων; Πολυφασικά φίλτρα; Cognitive radio; Software defined radio; Multicarrier modulation; Physical layer; Medium access control sublayer; Spectrum sensing; Three state sensing; Multirate signal processing; Channel modeling; Waveform; Frequency offset; Distributed control function; Intermittent operation; Orthogonal frequency division multiple access; Polyphase filters
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APA (6th Edition):
Μαλιάτσος, . . (2011). Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio). (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/26824
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Μαλιάτσος, Κωνσταντίνος. “Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio).” 2011. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed February 28, 2021.
http://hdl.handle.net/10442/hedi/26824.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Μαλιάτσος, Κωνσταντίνος. “Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio).” 2011. Web. 28 Feb 2021.
Vancouver:
Μαλιάτσος . Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio). [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2011. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10442/hedi/26824.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Μαλιάτσος . Τεχνικές μετάδοσης, ανάλυση και σχεδίαση προσαρμοστικών γνωστικών συστημάτων ραδιοεπικοινωνιών (Cognitive radio). [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2011. Available from: http://hdl.handle.net/10442/hedi/26824
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
ΤΡΥΦΩΝΑ, ΝΕΚΤΑΡΙΑ.
ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ.
Degree: 1996, Πανεπιστήμιο Πατρών; University of Patras
URL: http://hdl.handle.net/10442/hedi/6586
► ΤΑ ΣΥΣΤΗΜΑΤΑ ΓΕΩΓΡΑΦΙΚΩΝ ΠΛΗΡΟΦΟΡΙΩΝ ΑΝΗΚΟΥΝ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΩΝ "ΜΗ ΚΛΑΣΣΙΚΩΝ" ΕΦΑΡΜΟΓΩΝ ΠΟΥ ΧΑΡΑΚΤΗΡΙΖΟΝΤΑΙ ΑΠΟ ΕΙΔΙΚΕΣ ΑΝΑΓΚΕΣ ΜΟΝΤΕΛΟΠΟΙΗΣΗΣ ΚΑΙ ΔΙΑΧΕΙΡΙΣΗΣΔΕΔΟΜΕΝΩΝ ΚΑΘΩΣ ΚΑΙ ΥΨΗΛΕΣ ΑΠΑΙΤΗΣΕΙΣ ΔΙΑΧΕΙΡΙΣΗΣ ΔΟΣΟΛΗΨΙΩΝ.…
(more)
▼ ΤΑ ΣΥΣΤΗΜΑΤΑ ΓΕΩΓΡΑΦΙΚΩΝ ΠΛΗΡΟΦΟΡΙΩΝ ΑΝΗΚΟΥΝ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΩΝ "ΜΗ ΚΛΑΣΣΙΚΩΝ" ΕΦΑΡΜΟΓΩΝ ΠΟΥ ΧΑΡΑΚΤΗΡΙΖΟΝΤΑΙ ΑΠΟ ΕΙΔΙΚΕΣ ΑΝΑΓΚΕΣ ΜΟΝΤΕΛΟΠΟΙΗΣΗΣ ΚΑΙ ΔΙΑΧΕΙΡΙΣΗΣΔΕΔΟΜΕΝΩΝ ΚΑΘΩΣ ΚΑΙ ΥΨΗΛΕΣ ΑΠΑΙΤΗΣΕΙΣ ΔΙΑΧΕΙΡΙΣΗΣ ΔΟΣΟΛΗΨΙΩΝ. ΣΤΗΝ ΠΑΡΟΥΣΑ ΔΙΔΑΚΤΟΡΙΚΗ ΔΙΑΤΡΙΒΗ ΕΠΕΚΤΕΙΝΟΥΜΕ /ΕΞΕΙΔΙΚΕΥΟΥΜΕ ΤΑ ΗΔΗ ΥΠΑΡΧΟΝΤΑ ΕΡΓΑΛΕΙΑ ΔΙΑΧΕΙΡΙΣΗΣ ΚΑΙ ΑΝΑΠΤΥΞΗΣ ΚΛΑΣΣΙΚΩΝ ΕΦΑΡΜΟΓΩΝ ΜΕ ΣΚΟΠΟ ΤΗΝ ΑΠΟΤΕΛΕΣΜΑΤΙΚΗ ΑΝΤΙΜΕΤΩΠΙΣΗ ΤΩΝ ΙΔΙΑΙΤΕΡΟΤΗΤΩΝ ΤΗΣ ΧΩΡΙΚΗΣ ΠΛΗΡΟΦΟΡΙΑΣ ΜΕΣΑ ΑΠΟ ΜΙΑ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ. ΣΥΓΚΕΚΡΙΜΕΝΑ: 1) ΠΡΟΤΕΙΝΟΥΜΕ ΤΟ ΓΕΩΓΡΑΦΙΚΟ ΜΟΝΤΕΛΟ-ΠΛΑΙΣΙΟ ΓΙΑ ΤΟΝ ΟΡΙΣΜΟ ΒΑΣΙΚΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΝΝΟΙΩΝ, ΟΠΩΣ ΓΕΩΓΡΑΦΙΚΑ ΑΝΤΙΚΕΙΜΕΝΑ, ΓΕΩΜΕΤΡΙΚΟΙ ΤΥΠΟΙ, ΒΑΣΙΚΕΣ ΧΩΡΙΚΕΣ ΠΡΑΞΕΙΣ ΚΑΙ ΣΥΣΧΕΤΙΣΜΟΙ. 2) ΟΡΙΖΟΥΜΕ ΤΟ ΣΥΝΤΑΚΤΙΚΟ ΚΑΙΤΗ ΣΗΜΑΝΤΙΚΗ ΤΟΥ GEOIFO ΜΟΝΤΕΛΟΥ, ΠΟΥ ΠΡΟΤΕΙΝΕΤΑΙ ΩΣ ΜΟΝΤΕΛΟ-ΠΙΛΟΤΟΣ ΓΙΑ ΤΟΝΕΝΝΟΙΟΛΟΓΙΚΟ ΣΧΕΔΙΑΣΜΟ ΤΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ. 3) ΟΡΙΖΟΥΜΕ ΤΟ ΜΑΘΗΜΑΤΙΚΟ ΜΟΝΤΕΛΟ GEORELATIONAL ΓΙΑ ΤΟ ΛΟΓΙΚΟ ΣΧΕΔΙΑΣΜΟ ΤΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ, ΠΟΥ ΒΑΣΙΖΕΤΑΙ ΣΤΗ ΧΡΗΣΗ ΒΑΣΙΚΩΝ ΔΟΜΙΚΩΝ ΣΥΣΤΑΤΙΚΩΝ: ΣΧΕΣΕΙΣ, ΘΕΜΑΤΙΚΑ ΕΠΙΠΕΔΑ, ΙΔΕΑΤΑ ΕΠΙΠΕΔΑ, ΚΛΑΣΕΙΣ ΑΝΤΙΚΕΙΜΕΝΩΝ ΚΑΙ ΧΩΡΙΚΟΙ ΠΕΡΙΟΡΙΣΜΟΙ ΣΤΟ ΛΟΓΙΚΟ ΕΠΙΠΕΔΟ.4) ΤΕΛΟΣ, ΠΑΡΟΥΣΙΑΖΟΥΜΕ ΚΑΝΟΝΕΣ ΜΕΤΑΒΑΣΗΣ ΑΠΟ ΤΟ ΕΝΝΝΟΙΟΛΟΓΙΚΟ ΣΤΟ ΛΟΓΙΚΟ ΕΠΙΠΕΔΟ. ΟΙ ΚΑΝΟΝΕΣ ΑΥΤΟΙ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ ΩΣ Ο ΠΥΡΗΝΑΣ ΓΙΑ ΤΗ ΔΗΜΙΟΥΡΓΙΑ ΑΥΤΟΜΑΤΗΣ ΜΕΤΑΦΟΡΑΣ ΤΩΝ ΔΕΔΟΜΕΝΩΝ ΣΤΙΣ ΔΙΑΦΟΡΕΣ ΦΑΣΕΙΣ ΣΧΕΔΙΑΣΜΟΥ ΕΦΑΡΜΟΓΩΝ. (ΠΕΡΙΚΟΠΗ ΠΕΡΙΛΗΨΗΣ)
GEOGRAPHIC INFORMATION SYSTEMS BELONG TO THE NEW "NON-STANDARD" APPLICATION AREAS WITH SPECIAL DATA MODELING AND PROCESSING NEEDS AND EXTENDED DEMANDS ON TRANSACTION MANAGEMENT. IN THIS DISSERTATION WE EXTEND MODELS AND TOOLS, PROVIDED BY STANDARD APPLICATION DEVELOPMENT METHODOLOGIES USED FOR "CLASSICAL" APPLICATIONS, TO SERVE THE NEEDS OF GEOGRAPHIC INFORMATION SYSTEMS. IN PARTICULAR: (1) WE PROPOSE A GENERAL GEOGRAPHIC MODEL FOR THE DEFINITION OF THE BASIC CONCEPTS OF GEOGRAPHIC OBJECTS, GEOMETRIC TYPES, AND ELEMENTARY SPATIAL OPERATIONS AND RELATIONSHIPS; (2) WE DEFINE THE FORMAL SYNTAX AND SEMANTICS OF GEOIFO, WHICH SERVES AS A PROTOTYPICAL SEMANTIC MODEL SUITABLE FOR SPATIAL DATABASE MODELING AT THE CONCEPTUAL LEVEL; (3) WE PROPOSE THE FORMAL, YET PRACTICAL,GEORELATIONAL DATA MODEL FOR THE LOGICAL LEVEL, WHICH PROVIDES A SMALL SET OF REPRESENTATIONAL CONSTRUCTS (RELATIONS AND LAYERS FOR THE LOGICAL SCHEMA; VIRTUAL LAYERS, OBJECT CLASSES AND SPATIAL CONSTRAINTS FOR THE USER VIEWS) ON TOP OF WELL-ESTABLISHED MODELS AND, (4) FINALLY WE PRESENT RULES FOR TRANSFORMING A GEOIFO SCHEMA TO GEORELATIONAL ONE WHICH SERVED AS A BASIS FOR THE GEOGRAPHIC COMPUTER-AIDED SOFTWARE ENGINEERING TOOL. THIS PROPOSAL HAS BEEN USEDTO CONSTRUCT PROTOTYPICAL APPLICATIONS, SMALL COMMERCIAL SYSTEMS, AND LARGE RESEARCH PROJECTS. IT HAS RECEIVED A WELCOME ACCEPTANCE BY BOTH USERS, WHO FOUND IT EASY TO UNDERSTAND, AND DEVELOPERS, WHO ADOPRED IT QUICKLY. (ABSTRACT TRUNCATED)
Subjects/Keywords: CONCEPTUAL DESIGN OG GIS; GEOGRAPHIC COMPUTER - AIDED SOFTWARE ENGINEERIG; Geographic databases; Geographic information systems (GIS); LAYER ALGEBRA; LOGICAL DESIGN OF GIS; SPATIAL INFORMATION MODELING - GEOGRAPHIC OBJECTS; SPATIAL RELATIONS - SPATIAL INTEGRITY CONSTRAINTS; ΑΛΓΕΒΡΑ ΘΕΜΑΤΙΚΩΝ ΧΑΡΤΩΝ; ΑΥΤΟΜΑΤΟΠΟΙΗΣΗ ΣΧΕΔΙΑΣΜΟΥ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ; Βάσεις γεωγραφικών δεδομένων; ΓΕΩΓΡΑΦΙΚΑ ΑΝΤΙΚΕΙΜΕΝΑ; ΕΝΝΟΙΟΛΟΓΙΚΟΣ ΣΧΕΔΙΑΣΜΟΣ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ; ΜΟΝΤΕΛΟΠΟΙΗΣΗ ΧΩΡΙΚΗΣ ΠΛΗΡΟΦΟΡΙΑΣ; Συστήματα γεωγραφικών πληροφοριών; ΧΩΡΙΚΟΙ ΣΥΣΧΕΤΙΣΜΟΙ - ΠΕΡΙΟΡΙΣΜΟΙ ΟΡΘΟΤΗΤΑΣ
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APA (6th Edition):
ΤΡΥΦΩΝΑ, . (1996). ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ. (Thesis). Πανεπιστήμιο Πατρών; University of Patras. Retrieved from http://hdl.handle.net/10442/hedi/6586
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ΤΡΥΦΩΝΑ, ΝΕΚΤΑΡΙΑ. “ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ.” 1996. Thesis, Πανεπιστήμιο Πατρών; University of Patras. Accessed February 28, 2021.
http://hdl.handle.net/10442/hedi/6586.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ΤΡΥΦΩΝΑ, ΝΕΚΤΑΡΙΑ. “ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ.” 1996. Web. 28 Feb 2021.
Vancouver:
ΤΡΥΦΩΝΑ . ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ. [Internet] [Thesis]. Πανεπιστήμιο Πατρών; University of Patras; 1996. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/10442/hedi/6586.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ΤΡΥΦΩΝΑ . ΔΟΜΗΜΕΝΗ ΜΕΘΟΔΟΛΟΓΙΑ ΣΧΕΔΙΑΣΜΟΥ ΒΑΣΕΩΝ ΔΕΔΟΜΕΝΩΝ ΓΕΩΓΡΑΦΙΚΩΝ ΕΦΑΡΜΟΓΩΝ. [Thesis]. Πανεπιστήμιο Πατρών; University of Patras; 1996. Available from: http://hdl.handle.net/10442/hedi/6586
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Buttar, Sarpreet Singh.
Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work.
Degree: computer science and media technology (CM), 2019, Linnaeus University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-87117
► Self-adaptive systems have limited time to adjust their configurations whenever their adaptation goals, i.e., quality requirements, are violated due to some runtime uncertainties. Within…
(more)
▼ Self-adaptive systems have limited time to adjust their configurations whenever their adaptation goals, i.e., quality requirements, are violated due to some runtime uncertainties. Within the available time, they need to analyze their adaptation space, i.e., a set of configurations, to find the best adaptation option, i.e., configuration, that can achieve their adaptation goals. Existing formal analysis approaches find the best adaptation option by analyzing the entire adaptation space. However, exhaustive analysis requires time and resources and is therefore only efficient when the adaptation space is small. The size of the adaptation space is often in hundreds or thousands, which makes formal analysis approaches inefficient in large-scale self-adaptive systems. In this thesis, we tackle this problem by presenting an online learning approach that enables formal analysis approaches to analyze large adaptation spaces efficiently. The approach integrates with the standard feedback loop and reduces the adaptation space to a subset of adaptation options that are relevant to the current runtime uncertainties. The subset is then analyzed by the formal analysis approaches, which allows them to complete the analysis faster and efficiently within the available time. We evaluate our approach on two different instances of an Internet of Things application. The evaluation shows that our approach dramatically reduces the adaptation space and analysis time without compromising the adaptation goals.
Subjects/Keywords: Self-Adaptive Systems; Self-Adaptation; Architecture-Based Adaptation; Autonomous Systems; Cyber-Physical Systems; CPS; DeltaIoT; IoT; ActivFORMS; MAPE-K Feedback Loop; Runtime Uncertainties; Adaptation Space; Analysis; Machine Learning; Artificial Neural Network; ANN; Online Learning; Deep Learning; Online Supervised Learning; Incremental Learning; Classification; Multi-Layer Perceptron; MLP; Computer Vision and Robotics (Autonomous Systems); Datorseende och robotik (autonoma system); Computer Sciences; Datavetenskap (datalogi); Control Engineering; Reglerteknik; Software Engineering; Programvaruteknik
…24
29
30
1
Introduction
We live in a world where the involvement of modern software… …systems in human
activities is rapidly increasing. The software systems have to deal with… …software systems is to handle uncertainties that appear during runtime. For
instance, dynamic… …these uncertainties are unpredictable, which
may affect the behavior of the software systems… …Therefore, to tackle the runtime
uncertainties, software engineers have proposed one prominent…
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Buttar, S. S. (2019). Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work. (Thesis). Linnaeus University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-87117
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Buttar, Sarpreet Singh. “Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work.” 2019. Thesis, Linnaeus University. Accessed February 28, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-87117.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Buttar, Sarpreet Singh. “Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work.” 2019. Web. 28 Feb 2021.
Vancouver:
Buttar SS. Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work. [Internet] [Thesis]. Linnaeus University; 2019. [cited 2021 Feb 28].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-87117.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Buttar SS. Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work. [Thesis]. Linnaeus University; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-87117
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
27.
Kassa, Debessay.
Efficient cross-layer routing and congestion control architectures for distributed systems.
Degree: PhD, 0112, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/45430
► Major distributed systems such as the Internet, datacenter and hybrid P2P networks share a common known challenge of finding an optimal path to transfer content…
(more)
▼ Major distributed systems such as the Internet, datacenter and hybrid P2P networks share a common known
challenge of finding an optimal path to transfer content from a source to a destination and the optimal rate
at which content is transmitted. In general networks such as the Internet, per user, there is usually one
possible content source/destination such as a web server. There can be multiple possible paths to/from the
destination/source (server).
In datacenter networks which usually have a tree structure and in hybrid Peer-to-Peer (P2P) networks,
there can be multiple possible servers at which content can be stored and from which content can be re-
trieved. Multiple possible servers (sources/destinations) translates into multiple possible paths to/from a
content destination/source. Finding an optimal path to/from a destination/source requires efficient conges-
tion control and routing schemes.
The transmission control protocol (TCP) is the major congestion control protocol in the Internet. TCP
and its variants have the drawback of not accurately knowing rate share of flows at bottleneck links. Some
protocols proposed to address these drawbacks are not fair to short flows, which are the majority of the
Internet traffic. Other protocols result in high queue length and packet drops which translate into a high
average flow completion time (AFCT).
The currently major deployed intra-domain routing algorithm is the Open Shortest Path First (OSPF)
[1]. OSPF uses a simple heuristic routing metric (link weight). The routing metric used doesn’t properly
take into account the latest status of the network. Other traffic engineering schemes such as the TeXCP
proposed to address the routing issues of existing schemes also fail to find a globally (domain level) optimal
route. Besides, they incur additional probing and path reservation packet overheads.
Recently deployed datacenter network architectures rely on random server and hence path selection in
the attempt to ease congestion. However such random selection of paths can result in serious congestion
and content transfer delay. This can for instance be caused by large content transfers (elephant flows) which
take a long time to finish. In this case a random path selection can add to the congestion caused by elephant
flows. Existing cloud datacenter architectures such as the Google File System (GFS) and the Hadoop File
ii
System (HDFS) rely on a single name node server (NNS) to manage metadata information of which content
is stored in which server. A single NNS can be a potential bottleneck and a single point of failure.
Hybrid P2P content sharing can result in significant scalability gains in addition to assisting content
distribution networks (CDNs). However, currently proposed CDN and P2P hybrid schemes do not provide
accurate, fair and efficient incentives to attract and maintain more peers. Besides, they do not use efficient
prioritized congestion control and content source selection mechanisms to reduce content transfer times.
In this…
Advisors/Committee Members: Nahrstedt, Klara (advisor), Nahrstedt, Klara (Committee Chair), Godfrey, Philip B. (committee member), Lumetta, Steven S. (committee member), Fahmy, Sonia (committee member).
Subjects/Keywords: Cross-layer routing and congestion control; Adaptive rate allocation; Server selection; Load balancing; Generalized efficient sharing (GES); Fractional (partial) flows; Network level max-min fairness; Network level service level agreement; Network level quality of service; Hybrid peer to peer networks; Per packet prices; Efficient peer incentives; Meta-data management; Active/passive content; Content index management; Secure content exchange; Power-efficient datacenter; Efficient Openflow; Software defined networking; Surrogate servers; Low content transfer times; High throughput architectures
…1
1
2
6
Chapter 2 QCP: A Quick Cross-Layer Congestion
2.1 Introduction… …42
44
Chapter 3 SCDA: Cross-Layer SLA-aware Cloud Datacenter Architecture for Efficient… …74
Chapter 4 Hincent: Cross-Layer Quick Content Distribution
Incentives… …1.3 above, we design cross-layer routing and congestion
control schemes. Our schemes derive… …the transport layer crosses
a layer serving as a routing metric in the network layer. This…
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APA (6th Edition):
Kassa, D. (2013). Efficient cross-layer routing and congestion control architectures for distributed systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45430
Chicago Manual of Style (16th Edition):
Kassa, Debessay. “Efficient cross-layer routing and congestion control architectures for distributed systems.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 28, 2021.
http://hdl.handle.net/2142/45430.
MLA Handbook (7th Edition):
Kassa, Debessay. “Efficient cross-layer routing and congestion control architectures for distributed systems.” 2013. Web. 28 Feb 2021.
Vancouver:
Kassa D. Efficient cross-layer routing and congestion control architectures for distributed systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2142/45430.
Council of Science Editors:
Kassa D. Efficient cross-layer routing and congestion control architectures for distributed systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45430
28.
Campbell, Keith A.
Robust and reliable hardware accelerator design through high-level synthesis.
Degree: PhD, Electrical & Computer Engr, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/99294
► System-on-chip design is becoming increasingly complex as technology scaling enables more and more functionality on a chip. This scaling-driven complexity has resulted in a variety…
(more)
▼ System-on-chip design is becoming increasingly complex as technology scaling enables more and more functionality on a chip. This scaling-driven complexity has resulted in a variety of reliability and validation challenges including logic bugs, hot spots, wear-out, and soft errors. To make matters worse, as we reach the limits of Dennard scaling, efforts to improve system performance and energy efficiency have resulted in the integration of a wide variety of complex hardware accelerators in SoCs. Thus the challenge is to design complex, custom hardware that is efficient, but also correct and reliable.
High-level synthesis shows promise to address the problem of complex hardware design by providing a bridge from the high-productivity
software domain to the hardware design process. Much research has been done on high-level synthesis efficiency optimizations. This dissertation shows that high-level synthesis also has the power to address validation and reliability challenges through three automated solutions targeting three key stages in the hardware design and use cycle: pre-silicon debugging, post-silicon validation, and post-deployment error detection.
Our solution for rapid pre-silicon debugging of accelerator designs is hybrid tracing: comparing a datapath-level trace of hardware execution with a reference
software implementation at a fine temporal and spatial granularity to detect logic bugs. An integrated backtrace process delivers source-code meaning to the hardware designer, pinpointing the location of bug activation and providing a strong hint for potential bug fixes. Experimental results show that we are able to detect and aid in localization of logic bugs from both C/C++ specifications as well as the high-level synthesis engine itself.
A variation of this solution tailored for rapid post-silicon validation of accelerator designs is hybrid hashing: inserting signature generation logic in a hardware design to create a heavily compressed signature stream that captures the internal behavior of the design at a fine temporal and spatial granularity for comparison with a reference set of signatures generated by high-level simulation to detect bugs. Using hybrid hashing, we demonstrate an improvement in error detection latency (time elapsed from when a bug is activated to when it manifests as an observable failure) of two orders of magnitude and a threefold improvement in bug coverage compared to traditional post-silicon validation techniques. Hybrid hashing also uncovered previously unknown bugs in the CHStone benchmark suite, which is widely used by the HLS community. Hybrid hashing incurs less than 10% area overhead for the accelerator it validates with negligible performance impact, and we also introduce techniques to minimize any possible intrusiveness introduced by hybrid hashing.
Finally, our solution for post-deployment error detection is modulo-3 shadow datapaths: performing lightweight shadow computations in modulo-3 space for each main computation. We leverage the binding and scheduling…
Advisors/Committee Members: Chen, Deming (advisor), Chen, Deming (Committee Chair), Hwu, Wen-Mei W (committee member), Wong, Martin D F (committee member), Kim, Nam Sung (committee member).
Subjects/Keywords: High-level synthesis (HLS); Automation; Error detection; Scheduling; Binding; Compiler transformation; Compiler optimization; Pipelining; Modulo arithmetic; Modulo-3; Logic optimization; State machine; Datapath; Control logic; Shadow datapath; Modulo datapath; Low cost; High performance; Electrical bug; Aliasing; Stuck-at fault; Soft error; Timing error; Checkpointing; Rollback; Recovery; Pre-silicon validation; Post-silicon validation; Pre-silicon debug; Post-silicon debug; Accelerator; System on a chip; Signature generation; Execution signature; Execution hash; Logic bug; Nondeterministic bug; Masked error; Circuit reliability; Hot spot; Wear out; Silent data corruption; Observability; Detection latency; Mixed datapath; Diversity; Checkpoint corruption; Error injection; Error removal; Quick Error Detection (QED); Hybrid Quick Error Detection (H-QED); Instrumentation; Hybrid co-simulation; Hardware/software; Integration testing; Hybrid tracing; Hybrid hashing; Source-code localization; Software debugging tool; Valgrind; Clang sanitizer; Clang static analyzer; Cppcheck; Root cause analysis; Execution tracing; Realtime error detection; Simulation trigger; Nonintrusive; Address conversion; Undefined behavior; High-level synthesis (HLS) bug; Detection coverage; Gate-level architecture; Mersenne modulus; Full adder; Half adder; Quarter adder; Wraparound; Modulo reducer; Modulo adder; Modulo multiplier; Modulo comparator; Cross-layer; Algorithm; Instruction; Architecture; Logic synthesis; Physical design; Algorithm-based fault tolerance (ABFT); Error detection by duplicated instructions (EDDI); Parity; Flip-flop hardening; Layout design through error-aware transistor positioning dual interlocked storage cell (LEAP-DICE); Cost-effective; Place-and-route; Field programmable gate array (FPGA) emulation; Application specific integrated circuit (ASIC); Field programmable gate array (FPGA); Energy; Area; Latency
…Datapaths . .
3.3 Cross-Layer Reliability… …25
25
28
29
CHAPTER 5 PRE-SILICON DEBUG: HYBRID TRACING
5.1 Comparison to Software… …Comparisons . . . . . . . . . . . . . . . . . 88
CHAPTER 9 CROSS-LAYER RESILIENCE SYNERGIES… …High-level Synthesis benchmark suite
CLEAR
Cross-Layer Exploration for Architecting… …Service Pack, a minor software update
SP&R
Synthesis, Place, and Route
SRAM
Static Random…
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Record Details
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« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Campbell, K. A. (2017). Robust and reliable hardware accelerator design through high-level synthesis. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99294
Chicago Manual of Style (16th Edition):
Campbell, Keith A. “Robust and reliable hardware accelerator design through high-level synthesis.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 28, 2021.
http://hdl.handle.net/2142/99294.
MLA Handbook (7th Edition):
Campbell, Keith A. “Robust and reliable hardware accelerator design through high-level synthesis.” 2017. Web. 28 Feb 2021.
Vancouver:
Campbell KA. Robust and reliable hardware accelerator design through high-level synthesis. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/2142/99294.
Council of Science Editors:
Campbell KA. Robust and reliable hardware accelerator design through high-level synthesis. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99294
. 
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