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You searched for subject:(dependability characterization). Showing records 1 – 2 of 2 total matches.

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Universidade de Lisboa

1. Dixit, Mônica. Support for Dependable and Adaptive Distributed Systems and Applications.

Degree: 2014, Universidade de Lisboa

Distributed applications executing in uncertain environments, like the Internet, need to make timing/synchrony assumptions (for instance, about the maximum message transmission delay), in order to make progress. In the case of adaptive systems these temporal bounds should be computed at runtime, using probabilistic or specifically designed ad hoc approaches, typically with the objective of improving the application performance. From a dependability perspective, however, the concern is to secure some properties on which the application can rely. This thesis addresses the problem of supporting adaptive systems and applications in stochastic environments, from a dependability perspective: maintaining the correctness of system properties after adaptation. The idea behind dependable adaptation consists in ensuring that the assumed bounds for fundamental variables (e.g., network delays) are secured with a known and constant probability. Assuming that during its lifetime a system alternates periods where its temporal behavior is well characterized (stable phases), with transition periods where a variation of the network conditions occurs (transient phases), the proposed approach is based on the following: if the environment is generically characterized in analytical terms and it is possible to detect the alternation of these stable and transient phases, then it is possible to effectively and dependably adapt applications. Based on this idea, the thesis introduces Adaptare, a framework for supporting dependable adaptation in stochastic environments. An extensive evaluation of Adaptare is provided, assessing the correctness and effectiveness of the implemented mechanisms. The results indicate that the proposed strategies and methodologies are indeed effective to support dependable adaptation of distributed systems and applications. Finally, the applicability of Adaptare is evaluated in the context of two fundamental problems in distributed systems: consensus and failure detection. The thesis proposes solutions for these problems based on modular architectures in which Adaptare is used as a middleware for dependable adaptation of assumed timeouts. Advisors/Committee Members: Casimiro, António.

Subjects/Keywords: QoS adaptation; Stochastic network characterization; Dependability; Adaptive consensus; Adaptive failure detector; Adaptive distributed systems

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

APA (6th Edition):

Dixit, M. (2014). Support for Dependable and Adaptive Distributed Systems and Applications. (Thesis). Universidade de Lisboa. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/14296

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):

Dixit, Mônica. “Support for Dependable and Adaptive Distributed Systems and Applications.” 2014. Thesis, Universidade de Lisboa. Accessed July 08, 2020. http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/14296.

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

MLA Handbook (7th Edition):

Dixit, Mônica. “Support for Dependable and Adaptive Distributed Systems and Applications.” 2014. Web. 08 Jul 2020.

Vancouver:

Dixit M. Support for Dependable and Adaptive Distributed Systems and Applications. [Internet] [Thesis]. Universidade de Lisboa; 2014. [cited 2020 Jul 08]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/14296.

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

Council of Science Editors:

Dixit M. Support for Dependable and Adaptive Distributed Systems and Applications. [Thesis]. Universidade de Lisboa; 2014. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ul.pt:10451/14296

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

2. Khan, M.A. On improving dependability of analog and mixed-signal SoCs: A system-level approach.

Degree: 2014, University of Twente

Dependability of electronic systems, being an indispensable part of our civilian, industrial and military applications, has become increasingly important as a result of continuous technology scaling. The dependability or human reliance on these electronic systems has decreased as a result of new technologies which are far less mature as compared to older technologies. The electrical characteristics of the transistors and the wires will vary statistically in a spatial and temporal manner, directly translating into design uncertainty during fabrication and even during operational life. This combined impact of manufacturing uncertainty (e.g. process variability) and temporal degradation (aging) results in time-dependent variability and hence the means to impact the functionality and dependability of electronic systems. Unfortunately, traditional worst-case design slacks or margins are not sufficient anymore to capture the time-dependent system variability, especially in new technology nodes, and would result in over-pessimistic implementations with significant penalties in terms of area/delay/energy. As a result, time-dependent uncertainties become a great threat to the design of complex systems-on-chip (SoC) implementations and their dependability. It becomes extremely important in case of safety- or mission-critical systems because the dependability failure of these systems may result in enormous cost damage or even loss of human lives. Therefore, maintaining or achieving high system dependability in safety- or mission-critical systems is the most important property. Analog and mixed-signal front/back ends, being an important part of most critical systems especially in safety-critical (e.g. automotive, medical etc.) and mission-critical (e.g. military, space etc.) systems have received relatively little attention with regard to dependability. The dependability of these analog and mixed-signal front/back ends is essential in order to have a dependable interface between the real world and digital world. This is the main goal of the current research where new system-level strategies have been explored and investigated in order to enhance the dependability of analog and mixed-signal front ends especially during their operational life. Advisors/Committee Members: Smit, Gerardus Johannes Maria, Kerkhoff, Hans Gerard.

Subjects/Keywords: METIS-306179; IR-92381; Analog and mixed-signal dependability; Markov analysis; Degradation modelling; Dependable systems; Sensitivity analysis; offset voltage; design space exploration for dependable system; behavioral modeling; input signal monitoring; charge-redistribution SAR ADC; temperature monitoring; lifetime prediction; self-diagnosis; dependability characterization; dependability recovery scheme; dependable IPs; dependable design; EWI-25253; CAES-TDT: Testable Design and Test; self-calibration hardware redundancy; time befor failure

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

APA (6th Edition):

Khan, M. A. (2014). On improving dependability of analog and mixed-signal SoCs: A system-level approach. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html ; urn:nbn:nl:ui:28-92381 ; 15f74800-7d1b-4f1d-9df4-517dbf28d17e ; 10.3990/1.9789036537773 ; urn:isbn:978-90-365-3777-3 ; urn:nbn:nl:ui:28-92381 ; https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html

Chicago Manual of Style (16th Edition):

Khan, M A. “On improving dependability of analog and mixed-signal SoCs: A system-level approach.” 2014. Doctoral Dissertation, University of Twente. Accessed July 08, 2020. https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html ; urn:nbn:nl:ui:28-92381 ; 15f74800-7d1b-4f1d-9df4-517dbf28d17e ; 10.3990/1.9789036537773 ; urn:isbn:978-90-365-3777-3 ; urn:nbn:nl:ui:28-92381 ; https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html.

MLA Handbook (7th Edition):

Khan, M A. “On improving dependability of analog and mixed-signal SoCs: A system-level approach.” 2014. Web. 08 Jul 2020.

Vancouver:

Khan MA. On improving dependability of analog and mixed-signal SoCs: A system-level approach. [Internet] [Doctoral dissertation]. University of Twente; 2014. [cited 2020 Jul 08]. Available from: https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html ; urn:nbn:nl:ui:28-92381 ; 15f74800-7d1b-4f1d-9df4-517dbf28d17e ; 10.3990/1.9789036537773 ; urn:isbn:978-90-365-3777-3 ; urn:nbn:nl:ui:28-92381 ; https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html.

Council of Science Editors:

Khan MA. On improving dependability of analog and mixed-signal SoCs: A system-level approach. [Doctoral Dissertation]. University of Twente; 2014. Available from: https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html ; urn:nbn:nl:ui:28-92381 ; 15f74800-7d1b-4f1d-9df4-517dbf28d17e ; 10.3990/1.9789036537773 ; urn:isbn:978-90-365-3777-3 ; urn:nbn:nl:ui:28-92381 ; https://research.utwente.nl/en/publications/on-improving-dependability-of-analog-and-mixedsignal-socs-a-systemlevel-approach(15f74800-7d1b-4f1d-9df4-517dbf28d17e).html

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