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You searched for subject:(Grid data resources). Showing records 1 – 3 of 3 total matches.

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Wright State University

1. Pereira, Anil L. Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI).

Degree: PhD, Computer Science and Engineering PhD, 2007, Wright State University

Grid has emerged recently as an integration infrastructure for the sharing and coordinated use of diverse resources in dynamic, distributed virtual organizations (VOs). A Data Grid is an architecture for the access, exchange, and sharing of data in the Grid environment. In this dissertation, role-based access control (RBAC) systems for heterogeneous data resources in Data Grid systems are proposed. The Open Grid Services Architecture – Data Access and Integration (OGSA-DAI) is a widely used framework for the integration of heterogeneous data resources in Grid systems. However, in the OGSA-DAI system, access control causes substantial administration overhead for resource providers in VOs because each of them has to manage the authorization information for individual Grid users. Its identity-based access control mechanisms are severely inefficient and too complicated to manage because the direct mapping between users and privileges is transitory. To solve this problem, (1) the Community Authorization Service (CAS), provided by the Globus toolkit, and (2) the Shibboleth, an attribute authorization service, are used to support RBAC in the OGSA-DAI system. The Globus Toolkit is widely used software for building Grid systems. Access control policies need to be specified and managed across multiple VOs. For this purpose, the Core and Hierarchical RBAC profile of the eXtensible Access Control Markup Language (XACML) is used; and for distributed administration of those policies, the Object, Metadata and Artifacts Registry (OMAR) is used. OMAR is based on the e-business eXtensible Markup Language (ebXML) registry specifications developed to achieve interoperable registries and repositories. The RBAC systems allow quick and easy deployments, privacy protection, and the centralized and distributed management of privileges. They support scalable, interoperable and fine-grain access control services; dynamic delegation of rights; and user-role assignments. They also reduce the administration overheads for resource providers because they need to maintain only the mapping information from VO roles to local database roles. Resource providers maintain the ultimate authority over their resources. Moreover, unnecessary mapping and connections can be avoided by denying invalid requests at the VO level. Performance analysis shows that our RBAC systems add only a small overhead to the existing security infrastructure of OGSA-DAI. Advisors/Committee Members: Chung, Soon (Advisor).

Subjects/Keywords: Computer Science; Open Grid Services Architecture - Data Access and Integration (OGSA-DAI); Grid data resources; virtual organization (VO); Shibboleth; e-business eXtensible Markup Language (ebXML) Registry; Object, Metadata and Artifacts Registry (OMAR)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pereira, A. L. (2007). Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI). (Doctoral Dissertation). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1176331524

Chicago Manual of Style (16th Edition):

Pereira, Anil L. “Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI).” 2007. Doctoral Dissertation, Wright State University. Accessed November 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1176331524.

MLA Handbook (7th Edition):

Pereira, Anil L. “Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI).” 2007. Web. 20 Nov 2019.

Vancouver:

Pereira AL. Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI). [Internet] [Doctoral dissertation]. Wright State University; 2007. [cited 2019 Nov 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1176331524.

Council of Science Editors:

Pereira AL. Role-based Access Control for the Open Grid Services Architecture – Data Access and Integration (OGSA-DAI). [Doctoral Dissertation]. Wright State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1176331524

2. Cao, Yue. Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems.

Degree: PhD, Electrical & Computer Engr, 2017, University of Illinois – Urbana-Champaign

Modern large energy systems such as electricity grids and electrified transportation encounter increasing processed power in multi-physics domains, such as electrical, mechanical, thermal, and chemical. Although many systems are becoming predominantly electrical dependent, an integrated multi-physics energy approach creates additional avenues to higher power density, system efficiency, and reliability. Power electronics, serving as power conversion mechanisms, are key linking subsystems consisting of electronic devices, electro-mechanical units, energy storage, etc. This dissertation first studies the use of power electronic drives to implement dynamic thermal storage as effective inertia in solar-interfaced grid-connected low-energy buildings, as an example of a stationary large energy system. Dynamic management of energy components is used to offset variability of stochastic solar resources. Emphasis is on power electronic HVAC (heating, ventilation, and air-conditioning) drives, which can act as an effective electric swing bus to mitigate solar power variability. In doing so, grid power flows become substantially more constant, reducing the need for fast grid resources or dedicated energy storage such as batteries. The work defines a bandwidth over which such HVAC drives can operate. A practical band-pass filter is realized with a lower frequency bound such that the building maintains consistent temperature, and an upper frequency bound to ensure that commanded HVAC fan speeds do not update arbitrarily fast, avoid acoustic discomfort to occupants, and prevent undue hardware wear and tear. The dissertation then moves onto investigation of a mobile energy system, specifically more electric aircraft (MEA), with the purpose of evaluating thermal inertia’s efficacy in a microgrid-like inertia-lacking electrical system. Thermal energy inherent in the cabin air and aircraft fuel serves as a dynamic management solution to offset stochastic load power in the MEA power system. Power electronic controlled environmental control system (ECS) drives, emulating dynamic thermal inertia, showcase a more constant generator output power, allowing potential to downsize required generator ratings. An operating bandwidth is proposed similar to that of building HVAC systems, subject to additional degrees of constraints unique on MEA. A more sensitive virtual synchronous machine control boosts desirable inertia in sub-seconds scales in the MEA power system. To validate the thermal storage as effective inertia in both stationary and mobile energy systems, comprehensive simulation studies and experimental work are conducted at multiple levels. For the energy-efficient building research platform, building electrical and thermal energy systems modeling is addressed, including solar and HVAC systems as well as batteries and large-scale thermal storage. A lab-scale power system features various update rates of a variable frequency fan drive over stochastic solar data. A full-scale multiple-day case study provides insight on potential grid-side… Advisors/Committee Members: Krein, Philip T (advisor), Krein, Philip T (Committee Chair), Alleyne, Andrew G (committee member), Haran, Kiruba S (committee member), Pilawa-Podgurski, Robert CN (committee member).

Subjects/Keywords: Power electronic and drives; Power systems; Energy storage; Complex system energy management; Thermal storage; Grid-level energy storage; Stochastic energy resources; Energy efficient buildings; Heating, ventilation, and air conditioning (HVAC) systems; Solar energy; Thermal modeling; Maximum power point tracking (MPPT); High frequency solar data; More electric aircraft (MEA); Electric vehicles; Environmental control systems (ECS); Lithium-ion battery; Modeling and simulation; Loss modeling; Battery modeling; Vehicle dynamic simulator

…varying, grid-side (or building-side) resources. This is nearly equivalent to placing… …energy systems via means such as the electricity grid. In recent years, local electricity… …renewable resources connected via power electronics do not have inertia. On a building scale, such… …a grid is sometimes referred as a nanogrid [7]. A nanogrid is a single domain of… …grid support [10],[11]. Also addressed is dynamic scheduling of… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cao, Y. (2017). Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/98350

Chicago Manual of Style (16th Edition):

Cao, Yue. “Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed November 20, 2019. http://hdl.handle.net/2142/98350.

MLA Handbook (7th Edition):

Cao, Yue. “Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems.” 2017. Web. 20 Nov 2019.

Vancouver:

Cao Y. Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2019 Nov 20]. Available from: http://hdl.handle.net/2142/98350.

Council of Science Editors:

Cao Y. Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/98350


Brno University of Technology

3. Fujdiak, Radek. Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice .

Degree: 2017, Brno University of Technology

Telemetrické systémy, optimalizace, senzorické sítě, inteligentní sítě, internet věcí, senzory, informační bezpečnost, kryptografie, kryptografické algoritmy, kryptosystém, důvěrnost, integrita, autentičnost, čerstvost, nepopiratelnost.; Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation. Advisors/Committee Members: Mišurec, Jiří (advisor).

Subjects/Keywords: Dizertační práce se zabývá výzkumem v oblasti optimalizace telemetrických systémů v energetice z pohledu informační bezpečnosti. Práce pojednává o současných problémech informační bezpečnosti; její definici a i o metodách; které vedou k naplnění bezpečnostních principů; a soustředí se zejména na oblast; kde jsou využívány zařízení s omezenými zdroji To z toho důvodu; že zařízení s limitovanými zdroji; tj. operační paměť; omezený přístup k elektrické energii; výkon; aj.; představují bezpečnostní rizika; která mohou ovlivňovat následně celou energetickou infrastrukturu v případě nasazení technologií v konceptu inteligentních sítí. Jsou přiblíženy dnešní vědecké výzvy v této oblasti; objasněna terminologie i legislativa; která je pro tuto oblast také velice zásadní. Hlavní část dizertační práce je následně věnována výzkumu vlastního hybridního řešení; kryptosystému. Jedná se o řešení; které nenaplňuje pouze jeden bezpečnostní princip (např. pouze autentičnost); nýbrž o řešení; které nabízí všechny požadované principy informační bezpečnosti v energetice. Je provedena hloubková analýza dnešních řešení; které jsou následně evaluovány vlastními měřeními i pomocí současné aktuální literatury. Následně je proveden návrh kombinací symetrických a asymetrických kryptografických algoritmů; tak aby byla zaručena efektivita výsledného systému; ale také zachována jeho komplexnost systému. Jedná se o kombinaci symetrických blokových algoritmů elektronické kódové knihy; zajišťující autentizaci a integritu pomocí náhodných klíčů; řetězení šifrovaného textu zajišťující důvěrnost; společně s algoritmem Diffieho-Hellmana nad eliptickými křivkami zajišťující bezpečnou distribuci a výměnu symetrických tajných klíčů. V neposlední řadě je přiblížen provedený vlastní vývoj a optimalizace hybridního kryptosystému. Je představeno vlastní řešení pro reprezentaci velkých čísel a modulární algebru v zařízení s limitovanými zdroji; které je ověřeno experimentálními měřeními. Dále je rozebrán vlastní návrh; validace a optimalizace řešení náhodných hardwarových generátorů (založených na efektivním principu kvantizační chyby a protichůdných oscilátorů). Je také řešena navržená část symetrické kryptografie; kde je využito dvou dostupných knihoven; které jsou následně znatelně optimalizovány. V neposlední řadě je představen provedený rozsáhlý výzkum kryptografie eliptických křivek a možností distribuce symetrického klíče. Jsou implementovány algoritmy pro výpočty s body eliptických křivek nad polem s prvočíselným řádem i nad polem řádu 2. Realizace pak zahrnovala více než 50 eliptických křivek různých standardů; kde největším úspěchem jsou křivky nad polem prvočísel o řádu p = 256. Tyto křivky v době řešení nebyly na takto hardwarových platformách řešeny. Nakonec jsou představeny originální výsledky výzkumu; který se zabýval vhodnou volbou křivek a studií jejich doménových parametrů z pohledu vztahu velikosti k rychlosti operací nad křivkou.; The dissertation thesis focuses on research in the optimisation of telemetry systems in energy from the perspective of information security. The thesis deals with nowadays challenges in information security; its definition as well as its methods. The main focus is on the area; where devices with limited resources such as memory or computational power are used. These devices pose security risks that may affect the entire smart grid infrastructure. Nowadays research challenges terminology and legislative; which is crucial in the defined area; are brought closer. The main part of this thesis is devoted to the research of the author’s own hybrid solution – the hybrid cryptosystem. The solution fulfils all necessary principles of information security – authenticity; confidentiality; integrity and data freshness. An analysis of today’s solutions is provided together with a complex evaluation based on own experimental measurements and available literature sources. Subsequently; a combination of symmetric and asymmetric cryptography algorithms is designed that provides both high efficiency and complexity. It is a combination of the symmetric block cyphers Electronic Code Book; which provides authenticity and integrity by using random keys; Cipher Block Chaining; which provided confidentiality; and the asymmetric algorithm of Diffie-Hellman over Elliptic Curves; which provides key agreement scheme over an unsecured channel. Further; the development and optimisation of the hybrid cryptosystem are brought in light. The proprietary solution of large number representation and modular algebra in a device with limited resources is presented and validated via own experimental measurements. Moreover; the own design is analysed and the two proposed hardware generators (based on efficient methods of quantization error and opposing oscillators) are evaluated and optimised. Additionally; the symmetric part of the cryptosystem is also investigated; where two main solutions are highly optimised. Last but not least; deep research on the cryptography of elliptic curves and the key distribution scheme is presented. Two main curve types are dealt with – over a finite field and over a field of characteristic two. The implementation included more than 50 elliptic curves of different standards. The implementation of the curves of order p = 256 has the highest impact. These curves were not addressed on such devices at the time of solution. Finally; the original research results of possible speed optimisation via using special elliptic curves are introduced. The relationship between curve domain parameters and point computational efficiency is studied. This last part brings also promising results for the field of effective cryptographic algorithm – the lightweight cryptography.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Fujdiak, R. (2017). Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/69305

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):

Fujdiak, Radek. “Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice .” 2017. Thesis, Brno University of Technology. Accessed November 20, 2019. http://hdl.handle.net/11012/69305.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Fujdiak, Radek. “Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice .” 2017. Web. 20 Nov 2019.

Vancouver:

Fujdiak R. Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice . [Internet] [Thesis]. Brno University of Technology; 2017. [cited 2019 Nov 20]. Available from: http://hdl.handle.net/11012/69305.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fujdiak R. Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice . [Thesis]. Brno University of Technology; 2017. Available from: http://hdl.handle.net/11012/69305

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.