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    Fault tolerant operation of single-ended non-isolated DC-DC converters under open and short-circuit switch faults

    , Article 2013 15th European Conference on Power Electronics and Applications, EPE 2013 ; 2013 ; ISBN: 9781479901166 Jamshidpour, E ; Shahbazi, M ; Poure, P ; Gholipour, E ; Saadate, S ; Sharif University of Technology
    Fault tolerant operation of single-ended non-isolated DC-DC converters used in embedded and safety critical applications is mandatory to guaranty service continuity. This paper proposes a new, fast and efficient FPGA-based open and short-circuit switch fault diagnosis asssociated to fault tolerant converter topology. The results of Hardware-In-the-Loop and experimental tests are presented and discussed  

    Availability modeling in redundant OpenStack private clouds

    , Article Software - Practice and Experience ; Volume 51, Issue 6 , 2021 , Pages 1218-1241 ; 00380644 (ISSN) Faraji Shoyari, M ; Ataie, E ; Entezari Maleki, R ; Movaghar, A ; Sharif University of Technology
    John Wiley and Sons Ltd  2021
    In cloud computing services, high availability is one of the quality of service requirements which is necessary to maintain customer confidence. High availability systems can be built by applying redundant nodes and multiple clusters in order to cope with software and hardware failures. Due to cloud computing complexity, dependability analysis of the cloud may require combining state-based and nonstate-based modeling techniques. This article proposes a hierarchical model combining reliability block diagrams and continuous time Markov chains to evaluate the availability of OpenStack private clouds, by considering different scenarios. The steady-state availability, downtime, and cost are used...