Search for: fault-tolerant-systems
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    Reliable and high-speed KASUMI block cipher by residue number system code

    , Article World Applied Sciences Journal ; Volume 17, Issue 9 , 2012 , Pages 1149-1158 ; 18184952 (ISSN) Mahyar, H ; Sharif University of Technology
    Third generation cellular network technology (3G) can revolutionize communications and data exchanges between many people in a more overwhelming fashion than 2G and 2.5G networks did. The 3G UMTS, the 3G GSM and the 3G GPRS rely on the KASUMI block cipher. Therefore, increasing speed, decreasing power consumption and error detection/correction are the major concerns of the KASUMI algorithm and its generation. On the other hand, Residue Number System is a non-weighted number system and it is currently considered as an important method for high-speed, low-power, parallel and carry-free arithmetic realizations. Redundant Residue Number System is an extension of RNS that also supports error... 

    Error propagation analysis using FPGA-based SEU-fault injection

    , Article Microelectronics Reliability ; Volume 48, Issue 2 , 2008 , Pages 319-328 ; 00262714 (ISSN) Ejlali, A ; Miremadi, S. G ; Sharif University of Technology
    Error propagation analysis is one of the main objectives of fault injection experiments. This analysis helps designers to detect design mistakes and to provide effective mechanisms for fault tolerant systems. However, error propagation analysis requires that the chosen fault injection technique provides a high degree of observability (i.e., the ability to observe the internal values and events of a circuit after a fault is injected). Simulation-based fault injection provides a high observability adequate for error propagation analysis. However, the performance of the simulation-based technique is inadequate to handle today's hardware complexity. As an alternative, FPGA-based fault injection... 

    Open-circuit switch fault tolerant wind energy conversion system based on six/five-leg reconfigurable converter

    , Article Electric Power Systems Research ; Volume 137 , 2016 , Pages 104-112 ; 03787796 (ISSN) Shahbazi, M ; Saadate, S ; Poure, P ; Zolghadri, M ; Sharif University of Technology
    Elsevier Ltd  2016
    In this paper, an FPGA-controlled fault tolerant back-to-back converter for DFIG-based wind energy conversion application is studied. Before an open-circuit failure in one of the semiconductors, the fault tolerant converter operates as a conventional back-to-back six-leg one. After the fault occurrence in one of the switches, the converter will continue its operation with the remaining five healthy legs. Design, implementation, simulation and experimental verification of a reconfigurable control strategy for the fault tolerant six/five leg converter used in wind energy conversion are discussed. The proposed reconfigurable control strategy allows the uninterrupted operation of the converter... 

    Improving fault tolerance in ad-hoc networks by using residue number system

    , Article Journal of Applied Sciences ; Volume 8, Issue 18 , 2008 , Pages 3273-3278 ; 18125654 (ISSN) Barati, A ; Dehghan, M ; Movaghar, A ; Barati, H ; Sharif University of Technology
    In this study, we presented a method for distributing data storage by using residue number system for mobile systems and wireless networks based on peer to peer paradigm. Generally, redundant residue number system is capable in error detection and correction. In proposed method, we made a new system by mixing Redundant Residue Number System (RRNS), Multi Level Residue Number System (ML RNS) and Multiple Valued Logic (MVL RNS) which was perfect for parallel, carry free, high speed arithmetic and the system supports secure data communication. In addition it had ability of error detection and correction. In comparison to other number systems, it had many improvements in data security, error... 

    LESS-MICS: A low energy standby-sparing scheme for mixed-criticality systems

    , Article IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems ; Volume 39, Issue 12 , 2020 , Pages 4601-4610 Safari, S ; Hessabi, S ; Ershadi, G ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Multicore platforms are becoming the dominant trend in mixed-criticality systems (MCSs). Multicores provide great opportunities to realize task-level redundancy for reliability enhancement. However, they may experience limited utility in battery-powered mixed-criticality embedded systems. Hence, joint energy and reliability management is a crucial issue in designing MCSs. In this article, we propose the low energy standby-sparing mechanism in mixed-criticality system (LESS-MICS) scheme, which uses the inherent redundancy of multicores to apply the standby-sparing technique for fault-tolerance. Also, by using the inherent redundancy, the LESS-MICS scheme proposes the Parallelism and Reduction... 

    Fault tolerant IPMS motor drive based on adaptive backstepping observer with unknown stator resistance

    , Article 2008 3rd IEEE Conference on Industrial Electronics and Applications, ICIEA 2008, Singapore, 3 June 2008 through 5 June 2008 ; 2008 , Pages 1785-1790 ; 9781424417186 (ISBN) Nademi, H ; Tahami, F ; Rezaei, M ; Sharif University of Technology
    This work considers the problem of designing a fault tolerant system for IPMS motor drive subject to current sensor fault. To achieve this goal, two control strategies are considered. The first is based on field oriented control and a developed adaptive backstepping observer which simultaneously are used in the case of fault-free. The second approach proposed is concerned with fault tolerant strategy based on observer for faulty conditions. Stator resistance as possible source of system uncertainty is taken into account under different operating conditions. Current sensors failures are detected and observer based on adaptive backstepping approach is used to estimate currents and stator...