Loading...
Search for:
rajaei--s
0.071 seconds
Total 11034 records
Sliding-mode control of z-source inverter
, Article 34th Annual Conference of the IEEE Industrial Electronics Society, IECON 2008, Orlando, FL, 10 November 2008 through 13 November 2008 ; 2008 , Pages 947-952 ; 9781424417667 (ISBN) ; Kaboli, S ; Emadi, A ; Sharif University of Technology
IEEE Computer Society
2008
Abstract
In this paper, sliding-mode control (SMC) is applied to a z-source converter to control output dc voltage of impedance network. The converter is assumed working in continuous conduction mode (CCM). First a comprehensive review of the literature for z-source inverter (ZSI) and use of sliding mode control in switched converters are performed. The procedure of SMC design used in ZSI is presented. The simulations for the application of SMC in z-source inverter are made and the results are illustrated. The results verify the effectiveness and robustness of the controller. © 2008 IEEE
An energy-aware methodology for mapping and scheduling of concurrent applications in MPSoC architectures
, Article 2011 19th Iranian Conference on Electrical Engineering, ICEE 2011, 17 May 2011 through 19 May 2011 ; May , 2011 , Page(s): 1 ; ISSN : 21647054 ; 9789644634284 (ISBN) ; Hessabi, S ; Vahdat, B. V ; Sharif University of Technology
2011
Abstract
Mapping and Scheduling are two central and critical steps in design flow of the Networks on Chips (NoCs). They deal with implementation of the applications on NoCs. In this paper a novel energy aware algorithm, called EAMS, for mapping and scheduling of concurrent applications to NoC platforms is developed. It is considered that, the NoC architecture consists of a set of heterogeneous IP cores. The introduced algorithm finds a mapping of the tasks of the application to available IP cores so that the overall energy consumption, meeting task deadlines, is minimized
A Low-Cost highly reliable spintronic true random number generator circuit for secure cryptography
, Article SPIN ; Volume 10, Issue 1 , 2020 ; Amirany, A ; Rajaei, R ; Tabandeh, M ; Shouraki, S. B ; Sharif University of Technology
World Scientific Publishing Co. Pte Ltd
2020
Abstract
Generation of random numbers is one of the most important steps in cryptographic algorithms. High endurance, high performance and low energy consumption are the attractive features offered by the Magnetic Tunnel Junction (MTJ) devices. Therefore, they have been considered as one of the promising candidates for next-generation digital integrated circuits. In this paper, a new circuit design for true random number generation using MTJs is proposed. Our proposed circuit offers a high speed, low power and a truly random number generation. In our design, we employed two MTJs that are configured in special states. Generated random bit at the output of the proposed circuit is returned to the write...
Decentralized transactive energy management of multi-microgrid distribution systems based on ADMM
, Article International Journal of Electrical Power and Energy Systems ; Volume 132 , 2021 ; 01420615 (ISSN) ; Fattaheian Dehkordi, S ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Presence of microgrids (MGs) and renewable energy sources (RESs) in distribution power systems could result in dramatic changes in operation and planning of these systems. In this regard, operational procedures employed by utilities should take into account the intermittent nature of RESs, while coping with the independent operation of MGs. In this perspective, this paper develops a distributed power management framework based on alternating direction method of multipliers (ADMM) for distribution networks with multi-MG (MMG) structures. The proposed approach develops a transactive signal in the context of ADMM to coordinate operation of MGs in a distributed manner. In this context, the...
A High Performance MRAM Cell Through Single Free-Layer Dual Fixed-Layer Magnetic Tunnel Junction
, Article IEEE Transactions on Magnetics ; Volume 58, Issue 12 , 2022 ; 00189464 (ISSN) ; Tabandeh, M ; Shouraki, S. B ; Patooghy, A ; Rajaei, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
As technology size scales down, magnetic tunnel junctions (MTJs) as a promising technology are becoming more and more sensitive to process variation, especially in oxide barrier thickness. Process variation particularly affects the cell resistance and the critical switching current for the smaller dimensions. This article proposes an MTJ cell with one free and two pinned layers, which highly improves the process variation robustness. By employing the spin transfer torque (STT)-spin-Hall effect (SHE) switching method, our proposed MTJ cell improves the switching speed and lowers the switching power consumption. Per simulations, an MRAM cell built with the proposed MTJ cell offers up to 36%...
Single event upset immune latch circuit design using C-element
, Article Proceedings of International Conference on ASIC, 25 October 2011 through 28 October 2011, Xiamen ; 2011 , Pages 252-255 ; 21627541 (ISSN) ; 9781612841908 (ISBN) ; Tabandeh, M ; Sharif University of Technology
2011
Abstract
Downscaling trend in CMOS technology on the one hand and reducing supply voltage of the circuits on the other hand, make devices more susceptive to soft errors such as SEU. Latch circuits are prone to be affected by SEUs. In this article, we propose a new circuit design of latch using redundancy with the aim of immunity against SEUs. According to simulation results, our design not only guaranties full immunity, but also has the advantage of occupying less area and consuming much less power and performance penalty in comparison with other SEU immune latches. The simulation results show that our solution has 65.76% reduction in power and about 50.65% reduction in propagation delay in...
Azote Removal in Submerged Fixed Bed Reactor by Modified Ludzack-Ettinger (MLE)Process
, M.Sc. Thesis Sharif University of Technology ; Borgheei, Mahdi (Supervisor)
Abstract
Nitrogen compounds are becoming increasingly important in wastewater management, because of the many effects that nitrogenous material can have on the environment that need nitrogen removal. In this study, the performance of a submerged fixed bed reactor in nitrogen removal, constructed two anoxic and aerobic sections under Modified Ludzack-Ettinger process was investigated. Laboratory experiments were conducted at a constant COD concentration of 350 mg/lit, hydraulic retention times of 8, 12 and 18 hours and influent ammonia loading rate between 0.128 and 0.955 g NH3/m2.day. Nitrogen removal efficiency was obtained between 80.4 and 97.3%, and COD removal efficiency was achieved between 88.9...
Transactive energy management framework for active distribution systems
, Article 4th International Conference on Smart Energy Systems and Technologies, SEST 2021, 6 September 2021 through 8 September 2021 ; 2021 ; 9781728176604 (ISBN) ; Fattaheian Dehkordi, S ; Fotuhi Firuzabad, M ; Lehtonen, M ; University of Vaasa ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
Distribution networks are undergoing a fundamental transition due to the expansion of flexible resources as well as renewable energy sources in the system. In this regard, multi-agent structures are developed in modern distribution systems to facilitate the independent operation of local resources. Nevertheless, the non-coordinated operation of independent agents could result in a deviation between the real-time power purchased from transmission network and the day-ahead scheduling. Consequently, this paper aims to provide a novel framework that enables the decentralized management of multi-agent distribution systems, while coordinating the real-time power request and the day-ahead...
Developing a distributed robust energy management framework for active distribution systems
, Article IEEE Transactions on Sustainable Energy ; Volume 12, Issue 4 , 2021 , Pages 1891-1902 ; 19493029 (ISSN) ; Fattaheian Dehkordi, S ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Lehtonen, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
Restructuring and privatization in power systems have resulted in a fundamental transition of conventional distribution systems into modern multi-agent systems. In these structures, each agent of the distribution system would independently operate its local resources. In this regard, uncertainties associated with load demands and renewable energy sources could challenge the operational scheduling conducted by each agent. Therefore, this paper aims to develop a distributed operational management for multi-agent distribution systems taking into account the uncertainties of each agent. The developed framework relies on alternating direction method of multipliers (ADMM) to coordinate the...
Soft error rate estimation for combinational logic in presence of single event multiple transients
, Article Journal of Circuits, Systems and Computers ; Vol. 23, issue. 6 , 2014 ; Tabandeh, M ; Fazeli, M ; Sharif University of Technology
2014
Abstract
Fast and accurate estimation of soft error rate in VLSI circuits is an essential step in a soft error tolerant ASIC design. In order to have a cost effective protection against radiation effects in combinational logics, an accurate and fast method for identification of most susceptive gates and paths is needed. In this paper, an efficient, fast and accurate method for soft error propagation probability (SEPP) estimation is presented and its performance is evaluated. This method takes into account all three masking factors in multi cycles. It also considers multiple event transients as a new challenge in soft error tolerant VLSI circuit design. Compared with Monte Carlo (MC) simulation-based...
Low cost soft error hardened latch designs for nano-scale CMOS technology in presence of process variation
, Article Microelectronics Reliability ; Volume 53, Issue 6 , June , 2013 , Pages 912-924 ; 00262714 (ISSN) ; Tabandeh, M ; Fazeli, M ; Sharif University of Technology
2013
Abstract
In this paper, two Low cost and Soft Error Hardened latches (referred to as LSEH1 and LSEH2) are proposed and evaluated. The proposed latches are fully SEU immune, i.e. they are capable of tolerating all particle strikes to any of their nodes. Moreover, they can mask Single Event Transients (SETs) occurring in combinational logics and reaching the input of the latches. We have compared our SEU/SET-tolerant latches with some well-known previously proposed soft error tolerant latches. To evaluate the proposed latches, we have done a set of SPICE simulations. The simulation results trough comparisons with other hardened latches reveal that the proposed latches not only have more robustness but...
Single Event Multiple Upset (SEMU) tolerant latch designs in presence of process and temperature variations
, Article Journal of Circuits, Systems and Computers ; Volume 24, Issue 1 , January , 2015 ; 02181266 (ISSN) ; Tabandeh, M ; Fazeli, M ; Sharif University of Technology
World Scientific Publishing Co. Pte Ltd
2015
Abstract
In this paper, we propose two novel soft error tolerant latch circuits namely HRPU and HRUT. The proposed latches are both capable of fully tolerating single event upsets (SEUs). Also, they have the ability of enduring single event multiple upsets (SEMUs). Our simulation results show that, both of our HRPU and HRUT latches have higher robustness against SEMUs as compared with other recently proposed radiation hardened latches. We have also explored the effects of process and temperature variations on different design parameters such as delay and power consumption of our proposed latches and other leading SEU tolerant latches. Our simulation results also show that, compared with the reference...
Quantum discrepancy: A non-commutative version of combinatorial discrepancy
, Article Electronic Journal of Combinatorics ; Volume 27, Issue 2 , 2020 , Pages 1-29 ; Rajaee, M ; Rajaei, A ; Sharif University of Technology
Australian National University
2020
Abstract
In this paper, we introduce a notion of quantum discrepancy, a non-commutative version of combinatorial discrepancy which is defined for projection systems, i.e. finite sets of orthogonal projections, as non-commutative counterparts of set systems. We show that besides its natural algebraic formulation, quantum discrepancy, when restricted to set systems, has a probabilistic interpretation in terms of determinantal processes. Determinantal processes are a family of point processes with a rich algebraic structure. A common feature of this family is the local repulsive behavior of points. Alishahi and Zamani (2015) exploit this repelling property to construct low-discrepancy point...
A new approach of optimal appliance scheduling for peak load reduction of an off-grid residential building
, Article Journal of Building Performance Simulation ; Volume 16, Issue 2 , 2023 , Pages 131-143 ; 19401493 (ISSN) ; Haddadi, M ; Nord, N ; Sharif University of Technology
Taylor and Francis Ltd
2023
Abstract
Demand for electricity, due to the fast growth in urbanization and industrialization, is on the rapid rise. Load shift is a basic method for demand side management (DSM) that can be used by the central controller in buildings and can lead to the maximum use of renewable energy sources, maximum economic benefits, and reduction of peak demand. This paper proposes an algorithm for shifting the flexible loads of four selected appliances with respect to boundary limits for each appliance. A standalone four-story building with different number of occupants is considered to evaluate this algorithm. The algorithm was trained on Richardson model to minimize two objectives including aggregated demand,...
Analysis of Circular Slot Antenna on a Ferrite Substrate
, M.Sc. Thesis Sharif University of Technology ; Rajaei, Behzad (Supervisor)
Abstract
Circular polarization (CP) is one of the common polarization types used in wireless systems for frequency identification (RFID), global positioning (GPS) and wireless local area networks (WLAN), since it can provide greater flexibility in orientation angle between transmitter and receiver, and better mobility and weather penetration than the linearly polarized antennas. Magnetic permeability in ferrites can be tuned by external magnetic field ; So ferrites can be good candidates for new reconfigurable CP antenna technology. In this project, we will consider circularly polarized slot antenna with a wide axial ratio beamwidth that consists of a normally magnetized ferrite substrate mounted...
Separating and Bi-separating Maps and Their Relation to Banach-Stone Theorem
, M.Sc. Thesis Sharif University of Technology ; Ranjbar Motlagh, Alireza (Supervisor)
Abstract
Let C(S) and C(T) denote the sup-normed Banach spaces of real or complex-valued continuous functions on the compact Hausdorff spaces S and T, respectively. A linear map H:C(T)→C(S) is called separating if, for x,y∈C(T), xy≡0 implies HxHy≡0. In the second chapter of this thesis, we will show that any continuous separating map is a continuous multiple of a composition map. Moreover, it will be proved that any linear separating isomorphism of C(T) onto C(S) is continuous. We will also define separating and biseparating maps on the rings of continuous functions equipped with the compact-open topology. In addition, vector-valued separating maps will be investigated. For example, assume that C(T)...
Solving Congestion Pricing and Network Design Problem Simultaneously for Conventional and Automated Vehicles
, M.Sc. Thesis Sharif University of Technology ; Zokaei Aashtiani, Hedayat (Supervisor)
Abstract
In this dissertation, transportation networks with two classes of vehicles, including conventional vehicles and autonomous vehicles, have been studied. Four problems, including traffic assignment problem with two classes, congestion pricing problem for conventional vehicles, network design problem for autonomous vehicles, and simultaneous congestion pricing and network design problem, have been modeled and algorithms to solve them are presented. In this study, a dynamic penalty function algorithm is used to solve the congestion pricing problem, and a heuristic algorithm is used to solve the network design problem. Besides, the two-class traffic assignment problem is solved using the...
Simulation and Optimization of Downhole Pumps with Focus on IOR Application in Iranian Fields
, M.Sc. Thesis Sharif University of Technology ; Shad, Saeed (Supervisor)
Abstract
Three-dimensional (3D) computational fluid dynamics (CFD) was used in this study to investigate single and multi phase flow behavior related to three stages of ESP pump. Compared to experimental measurements, the numerical prediction for single phase flow of water is matched very well. Furthermore, the effects of viscosity and pump rotational speed for oil were investigated and the results show that by increasing oil viscosity and decreasing rotational speed, the pump head and efficiency reduced. ESP performance under two phase oil-methane flow and the effect of oil viscosity, rotational speed, intake pressure, gas bubble diameter, oil rate and gas volume fraction were studied. ESP boosting...
Developing a New Mechanism for Managing Technical Issues of Energy Transactions in Transactive Energy Market
, M.Sc. Thesis Sharif University of Technology ; Fotuhi Firuzabad, Mahmud (Supervisor)
Abstract
Distribution power systems are undergoing a fundamental transition with the introduction of microgrids (MGs) and proliferation of renewable energy sources inspired mainly by privacy and environmental concerns. In this regard, energy management methods employed by utilities should take into account the intermittent nature of RESs power production while coping with the independent operation of MGs. Transactive energy (TE) is an emerging concept which utilizes economic-based mechanisms to facilitate the dynamic and decentralized management of active agents of the system. However, the energy transactions between transactive agents could have adverse impacts on the technical aspect of the system...
Design of robust SRAM cells against single-event multiple effects for nanometer technologies
, Article IEEE Transactions on Device and Materials Reliability ; Volume 15, Issue 3 , 2015 , Pages 429-436 ; 15304388 (ISSN) ; Asgari, B ; Tabandeh, M ; Fazeli, M ; Sharif University of Technology
2015
Abstract
As technology size scales down toward lower two-digit nanometer dimensions, sensitivity of CMOS circuits to radiation effects increases. Static random access memory cells (SRAMs) that are mostly employed as high-performance and high-density memory cells are prone to radiation-induced single-event upsets. Therefore, designing reliable SRAM cells has always been a serious challenge. In this paper, we propose two novel SRAM cells, namely, RHD11 and RHD13, that provide more attractive features than their latest proposed counterparts. Simulation results show that our proposed SRAM cells as compared with some state-of-the-art designs have considerably higher robustness against single-event...