Reliability modeling of anomaly detection algorithms for wireless body area networks

, Article 2017 25th Iranian Conference on Electrical Engineering, ICEE 2017, 2 May 2017 through 4 May 2017 ; 2017 , Pages 70-75 ; 9781509059638 (ISBN) Zare Dehabadi, M. S ; Jahed, M ; Sharif University of Technology

2017

Abstract

Research on Wireless Body Area Networks (WBAN) has witnessed constant advances in small and low power integrated electronic circuits as well as wireless communication schemes for remote monitoring of patients. As such, high reliability anomaly detection has emerged as an important characteristic especially in detection of system faults and abnormal physiological measurements. This work studies the reliability of WBANs by utilizing a Markov-based chain model and considering hardware failure rate, patient health status, and accuracy of anomaly detection algorithms containing Detection Rate (DR), False Positive Rate (FPR), and accuracy of transient fault correction measures. The proposed...

Compensation for electrical fatigue in piezoelectric transducers

, Article IEEE Transactions on Instrumentation and Measurement ; Volume 72 , 2023 ; 00189456 (ISSN) Zare Dehabadi, M. S ; Jahed, M ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

Malfunction of ultrasonic transducers is one of the most common factors affecting the quality of medical ultrasound images. In this work, the effect of electrical fatigue in piezoelectric transducers on the image quality is investigated and subsequently compensated. To this end, through a combination of simulation and controlled experimental and clinical evaluations, the effect of fatigue and its compensation is realized. Initially, the electrical fatigue is simulated by reducing the piezoelectric permittivity and piezoelectric constant parameters based on finite element method (FEM). Next, the transducer's electromechanical impulse response is obtained, and the quality of reconstructed...

Medical ultrasound image restoration in presence of defective transducer elements

, Article 2023 31st International Conference on Electrical Engineering, ICEE 2023 ; 2023 , Pages 271-277 ; 979-835031256-0 (ISBN) Zare Dehabadi, M. S ; Jahed, M ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

Quality of medical ultrasound images is negatively affected by common defective elements in the ultrasonic transducer arrays. In this work, radio frequency (RF) signals from weak elements with low sensitivity are restored using an adaptive nonblind signal deconvolution method. For this purpose, the electromechanical impulse response of each element in the transducer must be measured. Initially, the negative effects of the RF signals recorded from each element are removed by Wiener deconvolution of RF signals through the measured impulse responses. Then to restore the RF signals, the deconvolution result is convolved with the reference electromechanical impulse response, corresponding to the...

Introducing a Supervisory Hardware Platform for Wireless Body Area Sensor Network with an Anomaly Detection Ability

, M.Sc. Thesis Sharif University of Technology Zare Dehabadi, Mohammad Saeed (Author) ; Jahed, Mehran (Supervisor)

Abstract

Wireless Body Area Network (WBAN) is a set of various physiological sensors for remote monitoring and controlling of the patient’s health status. Detection of anomalies, containing faults and physiological stresses, and distinguishing between them can eliminate the need for constant presence of specialists and decrease the occurrence of False Alarm Rate (FAR).A supervisory hardware platform for WBAN architecture is introduced and implemented in this thesis. The proposed architecture contains three sensors for recording of biomedical signals, heart rate, SpO2 and body temperature simultaneously and transmitting them to central node wirelessly through Wi-Fi standard. This proposed architecture...

Robust Reconstruction of Medical Ultrasound Images in The Presence of Transducer Faults

, Ph.D. Dissertation Sharif University of Technology Zare Dehabadi, Mohammad Saeed (Author) ; Jahed, Mehran (Supervisor)

Abstract

Medical ultrasound imaging is one of the common imaging methods in modern medicine, which is used to diagnose and even treat some diseases due to its cheapness and harmlessness. Medical ultrasound transducer arrays have a significant error rate. They are a major cause of failure in ultrasound imaging systems. This problem causes a noticeable decrease in the quality of the images and medical misdiagnoses. The topics of accurate detection of the location and severity of the error or failure, as well as the compensation for weak transducers by signal processing methods, have received less attention from predecessor researchers. In this thesis, an innovative method for accurate error detection...

Using commercial calcium ionophores to make lanthanide sensors

, Article Journal of Radioanalytical and Nuclear Chemistry ; Volume 331, Issue 4 , 2022 , Pages 1751-1758 ; 02365731 (ISSN) Dehabadi, M ; Saveliev, M ; Legin, A ; Yaghmaei, S ; Babain, V ; Kirsanov, D ; Sharif University of Technology

Springer Science and Business Media B.V 2022

Abstract

Developing chemical sensors with pronounced sensitivity towards lanthanides is a very important task related to the analytical control of industrial processes in nuclear industry. Various diamides of organic acids were shown to be very effective for such sensing applications when employed as ligands in plasticized polymeric membranes of potentiometric sensors. The chemical structures of some of these ligands (diamides of diglycolic acid) are very similar to those suggested in 80’s as Ca(II) ionophores that were later commercialized. We have hypothesized that commercial ionophores ETH 129 (N,N,N′,N′-tetra[cyclohexyl] diglycolic acid diamide) and ETH 5234...

An efficient synchronization circuit in multi-rate SDH networks

, Article Arabian Journal for Science and Engineering ; Volume 39, Issue 4 , April , 2014 , Pages 3101-3109 ; ISSN: 13198025 Zare, M ; Hessabi, S ; Goudarzi, M ; Sharif University of Technology

2014

Abstract

Single-rate synchronous digital hierarchy (SDH) networks contain one master block and several slave blocks and the slaves will synchronize themselves by the master clock frequency. However, the clock frequencies of master and slaves are different in multi-rate SDH networks and hence, the slaves require a synchronization circuit to match their clock frequencies with the master clock frequency. This research presents an efficient synchronization circuit for such networks. The proposed circuit occupies smaller area than the prior circuit and requires no clock alignment for its implementation. The circuit constraints are described and the maximum clock frequencies of master and slaves are...

Throughput enhancement for repetitive internal cores in latency-insensitive systems

, Article IET Computers and Digital Techniques ; Volume 6, Issue 5 , 2012 , Pages 342-352 ; 17518601 (ISSN) Zare, M ; Hessabi, S ; Goudarzi, M ; Sharif University of Technology

IEEE 2012

Abstract

Latency-insensitive design (LID) is a correct by-construction methodology for system on chip design that prevents multiple iterations in synchronous system design. However, one problem in the LID is system throughput reduction. In this study, a protocol is proposed to increase the throughput of internal cores in the latency-insensitive systems when there are several repetitive structures. The validation of the protocol is checked for latency equivalency in various system graphs. A shell wrapper to implement the protocol is described and superimposed logic gates for the shell wrapper are formulated. Simulation is performed for 12 randomly generated systems and four actual systems. The...

A generalization of 0-sum flows in graphs

, Article Linear Algebra and Its Applications ; Volume 438, Issue 9 , 2013 , Pages 3629-3634 ; 00243795 (ISSN) Akbari, S ; Kano, M ; Zare, S ; Sharif University of Technology

2013

Abstract

Let G be a graph and H be an abelian group. For every subset SH a map φ:E(G)→S is called an S-flow. For a given S-flow of G, and every v∈V(G), define s(v)=∑uv∈E(G)φ(uv). Let k∈H. We say that a graph G admits a k-sum S-flow if there is an S-flow such that for each vertex v,s(v)=k. We prove that if G is a connected bipartite graph with two parts X={x1,⋯,xr}, Y={y1,⋯, ys} and c1,⋯,cr,d1,⋯, ds are real numbers, then there is an R-flow such that s( xi)=ci and s(yj)=dj, for 1≤i≤r,1≤j≤s if and only if ∑i=1rci=∑j=1s dj. Also, it is shown that if G is a connected non-bipartite graph and c1,⋯,cn are arbitrary integers, then there is a Z-flow such that s(vi)=ci, for i=1, ⋯,n if and only if the number...

Efficient periodic clock calculus in latency-insensitive design

, Article 2011 18th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2011, 11 December 2011 through 14 December 2011 ; Dec , 2011 , Pages 546-549 ; 9781457718458 (ISBN) Zare, M ; Hessabi, S ; Goudarzi, M ; Sharif University of Technology

2011

Abstract

Communication wire delay between multiple blocks is becoming a critical issue in System on Chip (SoC) design. Scheduling-based Latency-Insensitive Design (LID) is a method to alleviate wire delays by utilizing a central scheduling scheme for periodic clock gating of the blocks. The scheduling scheme resides in shift registers as sequences of '1' and '0' bits. In many systems, these sequences are too long, and have large area overhead. This problem indisposes the implementation of the scheduling based protocol. This paper proposes an algorithm that finds sequences with shorter lengths in comparison with the prior algorithm. On synthetic/random test cases, the algorithm gives 45% reduction on...

Heuristic algorithm for periodic clock optimisation in scheduling-based latency-insensitive design

, Article IET Computers and Digital Techniques ; Volume 9, Issue 3 , May , 2015 , Pages 165-174 ; 17518601 (ISSN) Zare, M ; Hessabi, S ; Goudarzi, M ; Sharif University of Technology

Institution of Engineering and Technology 2015

Abstract

Delay in communication wires causes design iterations in system-on-chip. Latency-insensitive design copes with this issue by encapsulating each core in a shell wrapper and inserting buffers in the wires to separate the design of core from that of communication wires. Scheduling-based latency-insensitive protocol is a methodology which employs shift registers for periodic clock gating of blocks instead of the shell wrappers. In many cases, the bit sequences inside the shift registers are too long and therefore consume a large area. This study presents a heuristic algorithm that optimises the bit sequences and produces them with shorter lengths compared with the existing method. The algorithm...

0-sum and 1-sum flows in regular graphs

, Article Electronic Journal of Combinatorics ; Volume 23, Issue 2 , 2016 ; 10778926 (ISSN) Akbari, S ; Kano, M ; Zare, S ; Sharif University of Technology

Australian National University 2016

Abstract

Let G be a graph. Assume that l and k are two natural numbers. An l-sum flow on a graph G is an assignment of non-zero real numbers to the edges of G such that for every vertex v of G the sum of values of all edges incident with v equals l. An l-sum k-flow is an l-sum flow with values from the set {±1,…, ±(k — 1)}. Recently, it was proved that for every r, r ≥ 3, r ≠ 5, every r-regular graph admits a 0-sum 5-flow. In this paper we settle a conjecture by showing that every 5-regular graph admits a 0-sum 5-flow. Moreover, we prove that every r-regular graph of even order admits a 1-sum 5-flow

The f -chromatic index of a graph whose f -core has maximum degree 2

, Article Canadian Mathematical Bulletin ; Volume 56, Issue 3 , 2013 , Pages 449-458 ; 00084395 (ISSN) Akbari, S ; Chavooshi, M ; Ghanbari, M ; Zare, S ; Sharif University of Technology

2013

Abstract

Let G be a graph. The minimum number of colors needed to color the edges of G is called the chromatic index of G and is denoted by x0(G). It is well known that δ(G) ≤ x0(G) ≤ δ(G) + 1, for any graph G, whereδ(G) denotes the maximum degree of G. A graph G is said to be class 1 if x0(G) = δ(G) and class 2 if x0(G) = δ(G)+1. Also, Gδ is the induced subgraph on all vertices of degreeδ(G). Let f : V(G) ! N be a function. An f -coloring of a graph G is a coloring of the edges of E(G) such that each color appears at each vertex v 2 V(G) at most f (v) times. The minimum number of colors needed to f -color G is called the f -chromatic index of G and is denoted by x0f (G). It was shown that for every...

Two methods with less donor site complications of epidermal cellular grafting in cell therapy of vitiligo

, Article Iranian Journal of Public Health ; Volume 52, Issue 9 , 2023 , Pages 2021-2024 ; 22516085 (ISSN) Nilforoushzadeh, M. A ; Ataei, A ; Zare, S ; Sharif University of Technology

Tehran University of Medical Sciences 2023

Identification of β-lactam-resistant coding genes in the treatment plant bactivated sludge process

, Article Desalination and Water Treatment ; Volume 281 , 2023 , Pages 137-149 ; 19443994 (ISSN) Moradi, S ; Fouladi Fard, R ; Aali, R ; Dolati, M ; Shams, S ; Asadi Ghalhari, M ; Hamta, A ; Dehabadi, M ; Sharif University of Technology

Desalination Publications 2023

Abstract

Wastewater treatment plants are the most important release source of antibiotic-resistance genes (ARGs) into the environment. This study aimed to identify β-lactam-resistance genes in Qom prov-ince municipal wastewater and also to determine the effect of municipal wastewater treatment plants with different processes on reducing these pollutants. Sampling was performed according to the standard protocol and at constant temperature conditions. Nine genes resistant to the six groups of β-lactam antibiotics were selected, and polymerase chain reaction (PCR) test was performed to identify the presence/absence of ARGs. At the same time, real-time PCR test was also carried out to quantitatively...

On the Lucky Choice Number of Graphs

, Article Graphs and Combinatorics ; Volume 29, Issue 2 , 2013 , Pages 157-163 ; 09110119 (ISSN) Akbari, S ; Ghanbari, M ; Manaviyat, R ; Zare, S ; Sharif University of Technology

2013

Abstract

Suppose that G is a graph and f: V (G) → ℕ is a labeling of the vertices of G. Let S(v) denote the sum of labels over all neighbors of the vertex v in G. A labeling f of G is called lucky if S(u) ≠ S(v) for every pair of adjacent vertices u and v. Also, for each vertex v ∈ V(G), let L(v) denote a list of natural numbers available at v. A list lucky labeling, is a lucky labeling f such that f(v) ∈ L(v) for each v ∈ V(G). A graph G is said to be lucky k-choosable if every k-list assignment of natural numbers to the vertices of G permits a list lucky labeling of G. The lucky choice number of G, ηl(G), is the minimum natural number k such that G is lucky k-choosable. In this paper, we prove that...

Some criteria for a graph to be Class 1

, Article Discrete Mathematics ; Volume 312, Issue 17 , September , 2012 , Pages 2593-2598 ; 0012365X (ISSN) Akbari, S ; Cariolaro, D ; Chavooshi, M ; Ghanbari, M ; Zare, S ; Sharif University of Technology

Elsevier 2012

Abstract

Let G be a graph. The core of G, denoted by GΔ, is the subgraph of G induced by the vertices of degree Δ(G), where Δ(G) is the maximum degree of G. A k-edge coloring of a graph G is a function f:E(G)L, where |L|=k and f( e1)≠f( e2), for every two adjacent edges e1, e2 of G. The edge chromatic number of G, denoted by χ′(G), is the minimum number k for which G has a k-edge coloring. A graph G is said to be Class 1 if χ′(G)= Δ(G) and Class 2 if χ′(G)=Δ(G)+1. In this paper, it is shown that, for every connected graph of even order, if GΔ= C6, then G is Class 1. Also, we prove that, if G is a connected graph, and every connected component of GΔ is a unicyclic graph or a tree, and GΔ is not a...

Transplantation of autologous epidermal melanocyte–keratinocyte cells suspension for cell therapy of vitiligo: A clinical evaluation and biometric assessment

, Article Journal of Cosmetic Dermatology ; Volume 21, Issue 12 , 2022 , Pages 7147-7152 ; 14732130 (ISSN) Nilforoushzadeh, M. A ; Farshi, S ; Nouri, M ; Alavi, S ; Bayat Tork, B ; Jaffary, F ; Zare, S ; Sharif University of Technology

John Wiley and Sons Inc 2022

Abstract

Introduction: Among several surgical treatments, the use of transplantation of epidermal cultured melanocytes or melanocytes–keratinocytes cell suspension has gained many researchers and dermatologists' attention as a new technique for the treatment of vitiligo. The present study aimed to transplant autologous epidermal melanocytes–keratinocytes cell suspension for the treatment of vitiligo. Methods: In this study, 15 volunteer patients aged between 18 and 45 years old were studied. The autologous melanocytes–keratinocytes cell suspension was then transplanted to the region after dermabrasion. The included patients were evaluated by VisioFace, MPA9, and Skin Scanner-DUB once before and 1, 2,...

LAXY: a location-based aging-resilient Xy-Yx routing algorithm for network on chip

, Article IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems ; Volume 36, Issue 10 , 2017 , Pages 1725-1738 ; 02780070 (ISSN) Rohbani, N ; Shirmohammadi, Z ; Zare, M ; Miremadi, S. G ; Sharif University of Technology

2017

Abstract

Network on chip (NoC) is a scalable interconnection architecture for ever increasing communication demand between processing cores. However, in nanoscale technology size, NoC lifetime is limited due to aging processes of negative bias temperature instability, hot carrier injection, and electromigration. Usually, because of unbalanced utilization of NoC resources, some parts of the network experience more thermal stress and duty cycle in comparison with other parts, which may accelerate chip failure. To slow down the aging rate of NoC, this paper proposes an oblivious routing algorithm called location-based aging-resilient Xy-Yx (LAXY) to distribute packet flow over entire network. LAXY is...

Experimental investigation and thermodynamic modeling of amino acids partitioning in a water/ionic liquid system

, Article Journal of Molecular Liquids ; Volume 260 , 15 June , 2018 , Pages 386-390 ; 01677322 (ISSN) Nazem, H ; Ghotbi, C ; Habibi Zare, M ; Shirazian, S ; Sharif University of Technology

Elsevier B.V 2018

Abstract

Amino acids partitioning including phenylalanine, glutamic acid, and tryptophan in aqueous and ionic liquid phases at temperature of 298.15 K and atmospheric pressure were measured. 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide used in this work can produce two phases with water immediately. The effect of aqueous solution pH on amino acids partitioning was studied and revealed that amino acid partitioning coefficient was decreased with increasing pH. This phenomenon pertains to the electrostatic interaction between cations of amino acid and the anions of ionic liquid which is decreased when pH increases. Considering the effect of pH, liquid-liquid equilibrium data of amino...