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reconfigurable-hardware
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Design of Reconfigurable Hardware Security Module Based on Network Protocol Detection
,
M.Sc. Thesis
Sharif University of Technology
;
Jahangir, Amir Hossein
(Supervisor)
Abstract
Nowadays, in the presence of different types of computer attacks and different methods of eavesdropping on network communications, nobody can deny the importance of cryptography. Hardware Security Modules that are specifically designed for this purpose are widely used as a fast and reliable tool for encrypting data in computer networks. In this project, using the common and well-known FPGA platform and by leveraging the reconfigurability feature of this platform and also by adding a network protocol detection module to the traditional architecture of Hardware Security Modules, a novel module has been designed and implemented that can encrypt and decrypt data in a communication network, at...
Accelerating Numerical Solution of Steady and Unsteady Equations Using FPGA
, Ph.D. Dissertation Sharif University of Technology ; Ebrahimi, Abbas (Supervisor)
Abstract
Nowadays one of the main challenges facing fluid dynamics simulations is the long duration of numerical calculations. The goal of this research is to use FPGAs (Field Programmable Gate Arrays) to accelerate fluid dynamics solutions. First, the ability of FPGAs in mathematical operations on floating point numbers is studied. Then, various fluid dynamics problems are implemented on the FPGA hardware, and each one is solved separately. Unsteady 1D Couette problem, 2D potential flow (Laplace equation), incompressible viscous fluid flow over a backward facing step, and compressible inviscid flow over a bump are some of the problems in question. FPGA is an integrated circuit containing a number of...
Reducing the Energy Consumption of the Embedded Real-Time Systems with Reconfigurable Components
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
Over the Recent Decade, the embedded systems have expanded to include a wide variety of products, ranging from digital cameras, to medical systems, to Radar and telecommunication systems, to sensor networks. Engineers strive to create ever smaller and faster products, many of which, such as battery operated systems, have stringent power requirements. Coupled with increasing pressure to decrease costs and time-to-market, the design constraints of embedded systems pose a serious challenge to embedded systems designers. Dynamic reconfigurable hardware can provide a flexible and efficient platform for satisfying the area, performance, cost, and power requirements of many embedded systems....
A fast and series-stacked IGBT switch with balanced voltage sharing for pulsed power applications
, Article IEEE Transactions on Plasma Science ; Volume 44, Issue 10 , 2016 , Pages 2013-2021 ; 00933813 (ISSN) ; Mohsenzade, S ; Kaboli, S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
Abstract
The series configuration of fast semiconductor switches seems to be the key component in the high-voltage and fast rising time pulse generation. In this approach, two important issues must be considered. The first is to provide a safe operating condition for the switches in transient intervals. The second is to design a gate drive system with the capability of driving a large number of discrete devices simultaneously. The aim of this paper is to obviate these two requirements. First, different factors affecting the unbalanced voltage sharing between the series switches are discussed. In this investigation, the switch-to-ground parasitic capacitance effect has been recognized as the major...
Performance analysis of carrier-less modulation schemes for wireless nanosensor networks
, Article 15th IEEE International Conference on Nanotechnology, 27 July 2015 through 30 July 2015 ; 2015 , Pages 45-50 ; 9781467381550 (ISBN) ; Hassan, M ; Chou, C. T ; Bayat, S ; Nanotechnology Council ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
Abstract
Wireless Nano-scale Sensor Networks (WNSNs) are very simple and energy restricted networks that operate over terahertz band ranging from 0.1-10 THz, which faces significant molecular absorption noise and attenuation. Given these challenges, reliability, energy efficiency, and simplicity constitute the main criteria in designing communication protocols for WNSNs. Due to its simplicity and energy efficiency, carrier-less pulse based modulation is considered the best candidate for WNSNs. In this paper, we compare the performance of four different carrier-less modulations, PAM, OOK, PPM, and BPSK, in the context of WNSNs operating within the terahertz band. Our study shows that although BPSK is...
A partial task replication algorithm for fault-tolerant FPGA-based soft-multiprocessors
, Article CSI Symposium on Real-Time and Embedded Systems and Technologies, RTEST 2015, 7 October 2015 through 8 October 2015 ; October , 2015 , Page(s): 1 - 7 ; 9781467380478 (ISBN) ; Farbeh, H ; Miremadi, S. G ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
FPGA-based multiprocessors, referred as softmultiprocessors, have an increasing use in embedded systems due to appealing SRAM features. More than 95% of such FPGAs are occupied by SRAM cells constructing the configuration bits. These SRAM cells are highly vulnerable to soft errors threatening the reliability of the system. This paper proposes a fault-tolerant method to detect and correct errors in the configuration bits. The main of this method is to analyze the scheduled task graph and select a subset of tasks to be replicated in multiple processors based on the utilization of the processors in different execution phases. To this end, 1) errors are detected by re-executing a subset of tasks...
Decentralized control of reconfigurable robots using joint-torque sensing
, Article International Conference on Robotics and Mechatronics, ICROM 2015, 7 October 2015 through 9 October 2015 ; 2015 , Pages 581-585 ; 9781467372343 (ISBN) ; Sharif University of Technology
Abstract
In this paper, a decentralized controller for trajectory tracking of modular and reconfigurable robot manipulators is developed. The proposed control scheme uses joint-torque sensory feedback; also sliding mode control is employed to make both position and velocity tracking errors of robot manipulators globally converging to zero. Proposed scheme also guarantees that all signals in closed-loop systems will be bounded. In contrast to some of prior works in this scheme, each controller uses a smooth law to achieve its purposes. In this method, each controller uses only local information for producing control law hence separated controller can be used to control each module of manipulator and...
Designing low power and durable digital blocks using shadow nanoelectromechanical relays
, Article IEEE Transactions on Very Large Scale Integration (VLSI) Systems ; Volume 24, Issue 12 , 2016 , Pages 3489-3498 ; 10638210 (ISSN) ; Khaleghi, B ; Ienne, P ; Asadi, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
Abstract
Nanoelectromechanical (NEM) relays are a promising emerging technology that has gained widespread research attention due to its zero leakage current, sharp ON-OFF transitions, and complementary metal-oxide-semiconductor compatibility. As a result, NEM relays have been significantly investigated as highly energy-efficient design solutions. A major shortcoming of NEMs preventing their widespread use is their limited switching endurance. Hence, in order to utilize the low-power advantages of NEM relays, further device, circuit, and architectural techniques are required. In this paper, we introduce the concept of shadow NEM relays, which is a circuit-level technique to leverage the energy...
Flicker-free electrolytic capacitor-less universal input offline LED driver with PFC
, Article IEEE Transactions on Power Electronics ; Volume 31, Issue 9 , 2016 , Pages 6553-6561 ; 08858993 (ISSN) ; Rezazadeh, G ; Zolghadri, M. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Recent developments in improving lighting efficiency and cost reduction of LEDs have made them suitable alternatives to the current lighting systems. In this paper, a novel offline structure is proposed to drive LEDs. The proposed circuit has a high-input power factor, high efficiency, a long lifetime, and it produces no flicker. To increase the lifetime of the converter, the proposed circuit does not include any electrolytic capacitors in the power stage. The proposed circuit consists of a transition mode flyback converter in order to improve power factor. Additionally, a buck converter is added to the third winding of the flyback transformer in order to create two parallel paths for the...
DiskAccel: Accelerating disk-based experiments by representative sampling
, Article Performance Evaluation Review, 15 June 2015 through 19 June 2015 ; Volume 43, Issue 1 , 2015 , Pages 297-308 ; 01635999 (ISSN) ; Asadi, H ; Sarbazi Azad, H ; Sharif University of Technology
Association for Computing Machinery
2015
Abstract
Disk traces are typically used to analyze real-life workloads and for replay-based evaluations. This approach benefits from capturing important details such as varying behavior patterns, bursty activity, and diurnal patterns of system activity, which are often missing from the behavior of workload synthesis tools. However, accurate capture of such details requires recording traces containing long durations of system activity, which are difficult to use for replay-based evaluation. One way of solving the problem of long storage trace duration is the use of disk simulators. While publicly available disk simulators can greatly accelerate experiments, they have not kept up with technological...
No-go theorem for iterations of unknown quantum gates
, Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 93, Issue 1 , 2016 ; 10502947 (ISSN) ; Karimipour, V ; Sharif University of Technology
American Physical Society
Abstract
We propose a no-go theorem by proving the impossibility of constructing a deterministic quantum circuit that iterates a unitary oracle by calling it only once. Different schemes are provided to bypass this result and to approximately realize the iteration. The optimal scheme is also studied. An interesting observation is that for a large number of iterations, a trivial strategy like using the identity channel has the optimal performance, and preprocessing, postprocessing, or using resources like entanglement does not help at all. Intriguingly, the number of iterations, when being large enough, does not affect the performance of the proposed schemes
S2AP: An efficient numerical-based crosstalk avoidance code for reliable data transfer of NoCs
, Article 10th International Symposium on Reconfigurable and Communication-centric Systems-on-Chip,, 29 June 2015 through 1 July 2015 ; June , 2015 , Page(s): 1 - 6 ; 9781467379427 (ISBN) ; Miremadi, S. G ; Janssen K ; DFG ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
Data traversal in Network-on-Chips (NoCs) is threated by crosstalk fault seriously. Crosstalk fault leads to mutual influence between adjacent wires of NoCs and as a result endangers the reliability of data in NoCs. Crosstalk fault is strongly dependent on the transition patterns appearing on the wires of NoCs. Among these transitions, Triplet Opposite Directions (TODs) impose the worse crosstalk effects to the wires of NoCs. This paper proposes an efficient numerical-based coding mechanism called Summation-based-Subtracted-Added-Penultimate (S2AP) which alleviates crosstalk faults. This is done by completely removing TODs which are the main source of crosstalk faults in the channels of...
FPGA-based reconfigurable control for fault-tolerant back-to-back converter without redundancy
, Article IEEE Transactions on Industrial Electronics ; Volume 60, Issue 8 , May , 2013 , Pages 3360-3371 ; 02780046 (ISSN) ; Poure, P ; Saadate, S ; Zolghadri, M. R ; Sharif University of Technology
2013
Abstract
In this paper, an FPGA-based fault-tolerant back-to-back converter without redundancy is studied. Before fault occurrence, the fault-tolerant converter operates like a conventional back-to-back six-leg converter, and after the fault, it becomes a five-leg converter. Design, implementation, and experimental verification of an FPGA-based reconfigurable control strategy for this converter are discussed. This reconfigurable control strategy allows the continuous operation of the converter with minimum affection from a fault in one of the semiconductor switches. A very fast detection scheme is used to detect and locate the fault. Implementation of the fault detection and of the fully digital...
Fault-tolerant five-leg converter topology with FPGA-Based reconfigurable control
, Article IEEE Transactions on Industrial Electronics ; Volume 60, Issue 6 , 2013 , Pages 2284-2294 ; 02780046 (ISSN) ; Poure, P ; Saadate, S ; Zolghadri, M. R ; Sharif University of Technology
2013
Abstract
Fast fault detection and reconfiguration of power converters is necessary in electrical drives to prevent further damage and to make the continuity of service possible. On the other hand, component minimized converters may provide the benefits of higher reliability and less volume and cost. In this paper, a new fault-tolerant converter topology is studied. This converter has five legs before the fault occurrence, and after fault detection the converter continues to function with four legs. A very fast fault detection and reconfiguration scheme is presented and studied. Simulations and experimental tests are performed to evaluate the structure requirements, the digital reconfigurable...
Fast and simple open-circuit fault detection method for interleaved DC-DC converters
, Article 7th Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2016, 16 February 2016 through 18 February 2016 ; 2016 , Pages 440-445 ; 9781509003754 (ISBN) ; Zolghadri, M. R ; Ouni, S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Interleaved DC-DC boost converters are interesting choices in applications like fuel cells and photovoltaic systems. Although this converter offers low current ripple, but an open-circuit switch fault can lead to unacceptable current ripples. In this paper, a very fast and simple method is proposed to detect an open-circuit switch fault and its location. This method doesn't need any additional sensors, is efficient in CCM and DCM modes of operation, and can detect the fault in less than one switching period. Moreover, this method is suitable for implementation on an FPGA, due to the use of simple math and state machine blocks. Simulations are carried out to validate the effectiveness of this...
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) ; Saadate, S ; Poure, P ; Zolghadri, M ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
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...
On the energy harvesting via doubly curved piezoelectric panels
, Article Journal of Intelligent Material Systems and Structures ; Volume 27, Issue 19 , 2016 , Pages 2692-2706 ; 1045389X (ISSN) ; Rahnama, F ; Sharif University of Technology
SAGE Publications Ltd
Abstract
This article presents an analytical solution for power output from a doubly curved piezoelectric energy harvester. The energy harvester is made of an elastic core layer coupled with one or two surface-bonded piezoelectric layers. Five mechanical equations of motion together with Gauss's equation are derived on the basis of first-order shell theory and solved simultaneously for simply supported mechanical boundary conditions. The influence of structural damping is taken into account using Rayleigh damping. The electromechanical frequency response functions that relate the power output and circuit load resistance are identified from the exact solutions. Finally, the performance of the system...
Energy harvesting via shallow cylindrical and spherical piezoelectric panels using higher order shear deformation theory
, Article Composite Structures ; Volume 147 , 2016 , Pages 155-167 ; 02638223 (ISSN) ; Rahnama, F ; Askari Farsangi, M. A ; Sharif University of Technology
Elsevier Ltd
Abstract
In this article an analytical solution is presented for power output from a piezoelectric shallow shell energy harvester using higher order shear deformation theory (HSDT). The energy harvester is made of an elastic substrate layer coupled with one or two surface bonded piezoelectric layers. Mechanical equations of motion with Gauss's equation are derived on the basis of HSDT and solved simultaneously for simply-supported mechanical boundary conditions. The electromechanical frequency response functions that relate the power output and circuit load resistance are identified from the exact solutions. Using Rayleigh damping the influence of structural damping is taken into account. Also...
Efficient design of a coplanar adder/subtractor in quantum-dot cellular automata
, Article 9th UKSim-AMSS IEEE European Modelling Symposium on Computer Modelling and Simulation, EMS 2015, 6 October 2015 through 8 October 2016 ; 2015 , Pages 456-461 ; 9781509002061 (ISBN) ; Karimpour, M ; Sarayloo, M ; Romero G ; Orsoni A ; Al-Dabass D ; Pantelous A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
Scaling of CMOS devices being aggressively decreasing by reduce of transistor dimensions. However, such level of integration leads to many physical limit and transistors cannot get much smaller than their current size. Quantum-dot Cellular Automate is a novel technology which significantly reduces physical limit of CMOS devices implementation, thus, it can be an appropriate candidate to be substituted for CMOS technology. In addition to high integration density of QCA circuits, other unique specifications such as high speed and low power consumption encourage researchers to utilize this technology instead of CMOS technology. In this paper, a new layout of XOR gate is presented in QCA...
A compact all-solid-state self-compressing low-to-high power converting rF pulse generator
, Article IEEE Transactions on Plasma Science ; Volume PP, Issue 99 , 2016 ; 00933813 (ISSN) ; Hashemi, S. M. A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
In this paper, a novel method for high-repetition-rate high-power radio frequency (RF) pulse generation, which involves only passive solid-state devices and is capable of being used for generating high power microwaves using a low-to-high power converting scheme based on nonlinear self-compression is proposed. The method is also expected to be of low jitter. In the proposed circuit, two high voltage diodes with proper reverse recovery characteristics are used. The simulation results show that the proposed circuit generates RF pulses, with central frequencies up to gigahertz range. By applying a sub-kilowatt power supply, the maximum output power was well over 10 kW. This power can be...