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A non-intrusive portable fault injection framework to assess reliability of FPGA-based designs
, Article FPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology ; 2013 , Pages 398-401 ; 9781479921990 (ISBN) ; Ghaderi, Z ; Miremadi, S. G ; Sharif University of Technology
2013
Abstract
This paper proposes a full-featured fault injection framework to assess reliability of FPGA-based designs. The framework provides non-intrusiveness, portability, flexibility and performance in reliability evaluation of FPGA-based designs against adverse effects of SEUs. It works in a non-intrusive manner, allowing the reliability of ready-to-be-released designs to be assessed independently, without any intrusion into their place and route characteristics. We have studied implications of framework's intrusiveness into design under test by comparing proposed non-intrusive framework with previous intrusive methods; up to 5% deviation in the number of effective faults is observed in intrusive...
Evaluation of Fault Tolerance for SRAM-Based FPGAs by Fault Injection into Configuration Bits
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Ghasem (Supervisor)
Abstract
Reconfiguration, short development time and low cost have made Field Programmable Gate Arrays (FPGAs) an appealing option for digital circuit designers. Meanwhile, the occurrence of Single Event Upset (SEU) in configuration memory of SRAM-based FPGAs can change the implemented design inside the FPGA chip. Assessing reliability of FPGA-based designs against pernicious effects of SEU has long been a challenge. Several approaches can be used to evaluate the reliability of a given design. One important approach is injecting fault into the configuration memory of a device.The existing fault injection frameworks are specific in the property e.g. providing speed only, neglecting other properties of...
Toward electrically tunable, lithography-free, ultra-thin color filters covering the whole visible spectrum
, Article Scientific Reports ; Volume 8, Issue 1 , 2018 ; 20452322 (ISSN) ; Serebryannikov, A. E ; Khavasi, A ; Vandenbosch, G. A. E ; Ozbay, E ; Sharif University of Technology
Nature Publishing Group
2018
Abstract
The possibility of real-time tuning of optical devices has attracted a lot of interest over the last decade. At the same time, coming up with simple lithography-free structures has always been a challenge in the design of large-area compatible devices. In this work, we present the concept and the sample design of an electrically tunable, lithography-free, ultra-thin transmission-mode color filter, the spectrum of which continuously covers the whole visible region. A simple Metal-Insulator-Metal (MIM) cavity configuration is used. It is shown that using the electro-optic dielectric material of 4-dimethyl-amino-N-methyl-4-stilbazoliumtosylate (DAST) as the dielectric layer in this...
Analysis of parametric oscillations in high power amplifiers
, Article Scientia Iranica ; Volume 20, Issue 6 , 2013 , Pages 2084-2092 ; 10263098 (ISSN) ; Yousefi, A ; Mohammadi, E ; Babakrpour, E ; Medi, A ; Sharif University of Technology
Sharif University of Technology
2013
Abstract
A large-signal analysis of sub-harmonic parametric oscillations in Power Amplifiers (PAs) is presented in this paper. Simplified models for current-voltage and channel charge characteristics of short-channel pseudomorphic High Electron Mobility Transistors (pHEMTs) are adopted to investigate the effects of the device transconductance and gate-source capacitance nonlinearities on the amplifier stability. A 5-W Ku-band PA is designed to demonstrate the application of the presented analysis. MMIC PA is implemented in a 0.25-μm GaAs pHEMT process. According to the measurements, the PA provides 37.5 dBm (5.6 W) of output power, 36% of Power Added Efficiency (PAE), and small-signal gain of 18 dB...
Single-machine batch scheduling minimizing weighted flow times and delivery costs with job release times
, Article International Journal of Industrial Engineering Computations ; Volume 3, Issue 3 , 2012 , Pages 347-364 ; 19232926 (ISSN) ; Esfahani, A. N ; Sakkaki, S. E ; Pilerood, A. E ; Sharif University of Technology
2012
Abstract
This paper addresses scheduling a set of weighted jobs on a single machine in presence of release date for delivery in batches to customers or to other machines for further processing. The problem is a natural extension of minimizing the sum of weighted flow times by considering the possibility of delivering jobs in batches and introducing batch delivery costs. The classical problem is NP-hard and then the extended version of the problem is NP-hard. The objective function is that of minimizing the sum of weighted flow times and delivery costs. The extended problem arises in a real supply chain network by cooperation between two layers of chain. Structural properties of the problem are...
A route to unusually broadband plasmonic absorption spanning from visible to mid-infrared
, Article Plasmonics ; Volume 14, Issue 5 , 2019 , Pages 1269-1281 ; 15571955 (ISSN) ; Khavasi, A ; Serebryannikov, A.E ; Vandenbosch, G. A. E ; Ozbay, E ; Sharif University of Technology
Springer New York LLC
2019
Abstract
In this paper, a route to ultra-broadband absorption is suggested and demonstrated by a feasible design. The high absorption regime (absorption above 90%) for the suggested structure ranges from visible to mid-infrared (MIR), i.e., for the wavelength varying from 478 to 3278 nm that yields an ultra-wide band with the width of 2800 nm. The structure consists of a top-layer-patterned metal-insulator-metal (MIM) configuration, into the insulator layer of which, an ultra-thin 5 nm layer of manganese (Mn) is embedded. The MIM configuration represents a Ti-Al2O3-Ti tri-layer. It is shown that, without the ultra-thin layer of Mn, the absorption bandwidth is reduced to 274 nm. Therefore, adding only...
Fibrous and non-fibrous Perlite concretes – experimental and SEM studies
, Article European Journal of Environmental and Civil Engineering ; 2016 , Pages 1-27 ; 19648189 (ISSN) ; Eslami, E ; Anvari, A
Taylor and Francis Ltd
2016
Abstract
Mechanical properties and microstructural analysis of Expanded Perlite Aggregate (EPA) concretes are presented. Using 10% EPA, the effects of using various types of fibre were investigated. For all specimens, fibrous and non-fibrous, the compressive and the splitting tensile strengths were obtained. Complete stress–strain curves for fibre-reinforced specimens were obtained. A new index for representing the toughness of fibre-reinforced Perlite concretes is introduced. The addition of fibres substantially increased the splitting tensile strength. Steel fibres with “indentations” had the best performance in this regard. Regarding the toughness, specimens with “hooked” steel fibres performed...
Holographic entanglement entropy for excited states in two dimensional CFT
, Article Journal of High Energy Physics ; Volume 2013, Issue 3 , March , 2013 ; 11266708 (ISSN) ; Mosaffa, A. E ; Sharif University of Technology
2013
Abstract
We use holographic methods to study the entanglement entropy for excited states in a two dimensional conformal field theory. The entangling area is a single interval and the excitations are produced by in and out vertex operators with given scaling dimensions. On the gravity side we provide the excitations by turning on a scalar field with an appropriate mass. The calculation amounts to using the gravitational background, with a singular boundary, to find the one point function of the vertex operators. The singular boundary is taken care of by introducing a nontrivial UV regulator surface to calculate gravitational partition functions. By means of holographic methods we reproduce the field...
Quantum local quench, AdS/BCFT and Yo-Yo string
, Article Journal of High Energy Physics ; Volume 2015, Issue 5 , May , 2015 ; 11266708 (ISSN) ; Mosaffa, A. E ; Sharif University of Technology
Springer Verlag
2015
Abstract
Abstract: We propose a holographic model for local quench in 1 + 1 dimensional Conformal Field Theory (CFT). The local quench is produced by joining two identical CFT’s on semi-infinite lines. When these theories have a zero boundary entropy, we use the AdS/Boundary CFT proposal to describe this process in terms of bulk physics. Boundaries of the original CFT’s are extended in AdS as dynamical surfaces. In our holographic picture these surfaces detach from the boundary and form a closed folded string which can propagate in the bulk. The dynamics of this string is governed by the tensionless Yo-Yo string solution and its subsequent evolution determines the time dependence after quench. We use...
Measuring customer satisfaction using a fuzzy inference system
, Article Journal of Applied Sciences ; Volume 9, Issue 3 , 2009 , Pages 469-478 ; 18125654 (ISSN) ; Jahromi, A. E ; Sharif University of Technology
2009
Abstract
This study presents a new method called FCSMM (Fuzzy Customer Satisfaction Measurement Method) for measuring individual customer satisfaction using a fuzzy inference system. The main advantage of this method is its simplification in evaluation of Customer Satisfaction Index (CSI) based on simple linguistic statements collected from experienced people. In contrast with assumptions used in other methods such as linear regression principles and predefined criteria weights, the aforementioned statements form the FCSMM computational structure. Since the drivers of satisfaction and dissatisfaction and performance indexes can be simultaneously applied, concurrent direct and indirect customer...
The effect of hematocrit and nanoparticles diameter on hemodynamic parameters and drug delivery in abdominal aortic aneurysm with consideration of blood pulsatile flow
, Article Computer Methods and Programs in Biomedicine ; Volume 195 , October , 2020 ; Nasiri Sadr, A ; Kaffash, E ; Goudarzi, S ; Golab, E ; Karimipour, A ; Sharif University of Technology
Elsevier Ireland Ltd
2020
Abstract
Background and Objective: The present article has simulated to investigate the efficient hemodynamic parameters, the drug persistence, and drug distribution on an abdominal aortic aneurysm. Methods: Blood as a non-Newtonian fluid enters the artery acting as a real pulse waveform; its behavior is dependent on hematocrit and strain rate. In this simulation of computational fluid dynamic, magnetic nanoparticles of iron oxide which were in advance coated with the drug, are injected into the artery during a cardiac cycle. A two-phase model was applied to investigate the distribution of these carriers. Results: The results are presented for different hematocrits and the nanoparticle diameter. It...
Dynamic analysis of magnetic nanoparticles crossing cell membrane
, Article Journal of Magnetism and Magnetic Materials ; Volume 422 , 2017 , Pages 464- ; 03048853 (ISSN) ; Shamloo, A ; Ghafar Zadeh, E ; Alasty, E. Y. C. A ; Sharif University of Technology
Elsevier B.V
2017
Abstract
Nowadays, nanoparticles (NPs) are used in a variety of biomedical applications including brain disease diagnostics and subsequent treatments. Among the various types of NPs, magnetic nanoparticles (MNPs) have been implemented by many research groups for an array of life science applications. In this paper, we studied MNPs controlled delivery into the endothelial cells using a magnetic field. Dynamics equations of MNPs were defined in the continuous domain using control theory methods and were applied to crossing the cell membrane. This study, dedicated to clinical and biomedical research applications, offers a guideline for the generation of a magnetic field required for the delivery of...
Characterization and antibacterial performance of electrodeposited chitosan–vancomycin composite coatings for prevention of implant-associated infections [electronic resource]
, Article Journal of Materials Science and Engineering: C ; 1 August 2014, Volume 41, Pages 240–248 ; Tamjid, E ; Simchi, A. (Abdolreza) ; Sharif University of Technology
Abstract
Orthopaedic implant-associated infections are one of the most serious complications in orthopaedic surgery and a major cause of implant failure. In the present work, drug-eluting coatings based on chitosan containing various amounts of vancomycin were prepared by a cathodic electrophoretic deposition process on titanium foils. A three-step release mechanism of the antibiotic from the films in a phosphate-buffered saline solution was noticed. At the early stage, physical encapsulation of the drug in the hydrogel network controlled the release rate. At the late stage, however, in vitro degradation/deattachment of chitosan was responsible for the controlled release. Cytotoxicity evaluation of...
The effect of parameters of equilibrium-based 3-D biomechanical models on extracted muscle synergies during isometric lumbar exertion
, Article Journal of Biomechanics ; Volume 49, Issue 6 , 2016 , Pages 967-973 ; 00219290 (ISSN) ; Sedaghat Nejad, E ; Rashedi, E ; Sedighi, A ; Arjmand, N ; Parnianpour, M ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
A hallmark of more advanced models is their higher details of trunk muscles represented by a larger number of muscles. The question is if in reality we control these muscles individually as independent agents or we control groups of them called "synergy". To address this, we employed a 3-D biomechanical model of the spine with 18 trunk muscles that satisfied equilibrium conditions at L4/5, with different cost functions. The solutions of several 2-D and 3-D tasks were arranged in a data matrix and the synergies were computed by using non-negative matrix factorization (NMF) algorithms. Variance accounted for (VAF) was used to evaluate the number of synergies that emerged by the analysis, which...
On control of spacecraft relative motion in the case of an elliptic keplerian chief
, Article Advances in the Astronautical Sciences ; Vol. 150, issue , August , 2014 , p. 1413-1432 ; 2195268X ; Butcher, E. A ; Mesbahi, A ; Sharif University of Technology
2014
Abstract
In this study, control strategies based on time-varying LQR, Lyapunov-Floquet transformation (LFT), backstepping, feedback linearization, and constant gain feedback control are implemented for the linearized time periodic equations of spacecraft relative motion when the reference orbit is elliptic. Also, natural and nonnatural leader-follower two-spacecraft formations are studied. The stability of the closed-loop response, the control effort required, and the settling time are investigated and compared for all control strategies. Furthermore, using constant gain feedback, the estimated region of attraction of the closed-loop system is obtained analytically
Damage detection of offshore jacket structures using frequency domain selective measurements
, Article Journal of Marine Science and Application ; Volume 12, Issue 2 , June , 2013 , Pages 193-199 ; 16719433 (ISSN) ; Golafshani, A. A ; Ghodrati, E ; Sharif University of Technology
2013
Abstract
The development of damage detection techniques for offshore jacket structures is vital to prevent catastrophic events. This paper applies a frequency response based method for the purpose of structural healthCgreater detection efficiency. In addition, the performance of the proposed method was evaluated in relation to multiple damages. The aforementioned points are illustrated using the numerical study of a two dimensional jacket platform, and the results proved to be satisfactory utilizing the proposed methodology
Nonrigid registration of breast MR images using residual complexity similarity measure
, Article Iranian Conference on Machine Vision and Image Processing, MVIP, Zanjan ; Sept , 2013 , Pages 241-244 ; 21666776 (ISSN); 9781467361842 (ISBN) ; Ghaffari, A ; Fatemizadeh, E ; Sharif University of Technology
IEEE Computer Society
2013
Abstract
Elimination of motion artifact in breast MR images is a significant issue in pre-processing step before utilizing images for diagnostic applications. Breast MR Images are affected by slow varying intensity distortions as a result of contrast agent enhancement. Thus a nonrigid registration algorithm considering this effect is needed. Traditional similarity measures such as sum of squared differences and cross correlation, ignore the mentioned distortion. Therefore, efficient registration is not obtained. Residual complexity is a similarity measure that considers spatially varying intensity distortions by maximizing sparseness of the residual image. In this research, the results obtained by...
Axial enrichment profile in advance nuclear energy power plant at supercritical-pressures
, Article Kerntechnik ; Volume 80, Issue 6 , 2015 , Pages 541-544 ; 09323902 (ISSN) ; Zarifi, E ; Salehi, A. A ; Sharif University of Technology
Carl Hanser Verlag
2015
Abstract
The High-Performance Light Water Reactor (HPLWR) is the European version of the advance nuclear energy power plant at Supercritical-pressure. A light water reactor at supercritical pressure, being currently under design, is the new generation of nuclear reactors. The aim of this study is to predict the HPLWR neutronic behavior of the axial enrichment profile with an average enrichment of 5 w/o U-235. Neutronic calculations are performed using WIMS and CITATION codes. Changes in neutronic parameter, such as Power Peaking Factor (PPF) are discussed in this paper
Interactive educational tool for teaching a simple cipher
, Article Proceedings - 2014 International Symposium on Biometrics and Security Technologies, ISBAST 2014, 26 August 2014 through 27 August 2014 ; 2015 , Pages 102-105 ; 9781479964444 (ISBN) ; Zahedi, E ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper, a practical educational tool based on Java programming is described. The approach is based on using a fully interactive graphical user interface for teaching cipher algorithms. As an example, a transposition cipher is covered, where students can try different keys and observe the effect of parameters such as key length, choice of letters for the key on the ciphertext. At the same time, the process of breaking the cipher algorithm (cryptanalysis) is rendered possible by students injecting known plaintext. The developed program offers an option where it tries systematically all keys (brute force) to break the cipher. Being extendable, the platform is thought to be able to play a...
Active noise cancellation using feedforward and hybrid controls
, Article 2001 ASME International Mechanical Engineering Congress and Exposition, New York, NY, 11 November 2001 through 16 November 2001 ; Volume 2 , 2001 , Pages 1405-1412 ; Esmailzadeh, E ; Alasty, A ; Sharif University of Technology
2001
Abstract
The exact closed-form solution of a one-dimensional wave equation including the viscous damping effect has been obtained from the Green's function. Accurate models for the error sensor and secondary loudspeaker, which includes the electro-mechanical and mechano-acoustical couplings, have been used and the transfer function of the primary, secondary and acoustic feedback paths of the active noise control system have been obtained. The generalized form of the classical FXLMS algorithm, referred to G-FXLMS algorithm, has been developed. In contrast to the FXLMS algorithm, G-FXLMS algorithm does not neglect the time shift of the filter coefficients and employs a more general recursive adaptive...