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    Factors influencing adoption of e-payment systems: an empirical study on Iranian customers

    , Article Information Systems and e-Business Management ; Volume 15, Issue 1 , 2017 , Pages 89-116 ; 16179846 (ISSN) Barkhordari, M ; Nourollah, Z ; Mashayekhi, H ; Mashayekhi, Y ; Ahangar, M. S ; Sharif University of Technology
    Springer Verlag  2017
    Abstract
    Internet technology has influenced the banking systems because of its capability to enhance performance of financial operations. A major concern of Internet banking systems is the customers’ perception of security and trust. This study presents an experimental investigation on important factors influencing trust in e-payments systems in Iran. A set of potentially determinant factors of trust is developed and organized in three major groups: technical and transaction procedures, access to security guidelines, and usability. The direct effect of the factors on perceived trust, along with their indirect effect through perceived security, is evaluated in an empirical study. The data are... 

    Simulation of endurance time excitations via wavelet transform

    , Article Iranian Journal of Science and Technology - Transactions of Civil Engineering ; Volume 43, Issue 3 , 2019 , Pages 429-443 ; 22286160 (ISSN) Mashayekhi, M ; Estekanchi, H. E ; Vafai, H ; Sharif University of Technology
    Springer International Publishing  2019
    Abstract
    This paper puts forth a wavelet-based methodology for generating endurance time (ET) excitations. Conventional simulating practice expresses signals by acceleration values which are then computed via unconstrained nonlinear optimization. Dynamic characteristics of signals, including frequency content, are not represented directly in this type of variable definition. In this study, a new algorithm is developed to generate ET excitations in discrete wavelet transform (DWT) space. In this algorithm, signals are represented by transform coefficients. In addition, objective functions are modified in order to obtain transform coefficients and return the objective function values. The proposed... 

    A method for matching response spectra of endurance time excitations via the Fourier transform

    , Article Earthquake Engineering and Engineering Vibration ; Volume 19, Issue 3 , July , 2020 , Pages 637-648 Mashayekhi, M ; Estekanchi, H. E ; Vafai, H ; Sharif University of Technology
    Institute of Engineering Mechanics (IEM)  2020
    Abstract
    The endurance time (ET) method is a dynamic analysis in which structures are subjected to intensifying excitations, also known as ET excitation functions (ETEF). The ET method is a tool for structural response prediction. The main advantage of the ET method over conventional approaches is its much lower demand for computational efforts. The concept of acceleration spectra is used in generating existing ETEFs. It is expected that ETEF acceleration spectra increase consistently with time and remain proportional to a target spectrum. Nonlinear unconstrained optimization is commonly used to generate ETEFs. Generating new ETEFs is a complicated time-consuming mathematical problem. If the target... 

    Investigation of strong-motion duration consistency in Endurance Time excitation functions

    , Article Scientia Iranica ; Vol. 20, issue. 4 , 2014 , p. 1085-1093 ; 10263098 Mashayekhi, M ; Estekanchi, H. E ; Sharif University of Technology
    2014
    Abstract
    The Endurance Time (ET) method is a dynamic analysis procedure using intensifying excitation. The ET excitation functions are generated so that structural performance can be assessed at different excitation levels in a single response history analysis. ET accelerograms, which have been generated so far, possess response spectra consistency; this means that the duration consistency has not been directly considered. Strong-motion duration can influence the response of structures which have stiffness or strength degrading characteristics. In this paper, several well-known strong-motion duration definitions are studied in the context of the ET method. Ground motions are scaled to spectral... 

    Significance of effective number of cycles in endurance time analysis

    , Article Asian Journal of Civil Engineering ; Volume 13, Issue 5 , 2012 , Pages 647-657 ; 15630854 (ISSN) Mashayekhi, M ; Estekanchi, H. E ; Sharif University of Technology
    AJCE  2012
    Abstract
    Endurance Time (ET) method is a dynamic analysis procedure using intensifying accelerograms which can be used to assess the structural performance at different excitation levels. In generation process of current ET accelerograms, the compatibility between acceleration spectrum produced by the ET accelerograms and acceleration spectrum associated with the real ground motions is applied, whereas the duration consistency is not directly considered. It is generally accepted that the strong-motion duration can strongly influence the response of structures which have stiffness or strength degrading characteristics. In this study, the number of cycles that a structure should resist due to a ground... 

    Fouling control mechanism by optimum ozone addition in submerged membrane bioreactors treating synthetic wastewater

    , Article Journal of Environmental Chemical Engineering ; Volume 6, Issue 6 , 2018 , Pages 7294-7301 ; 22133437 (ISSN) Mashayekhi, F ; Hazrati, H ; Shayegan, J ; Sharif University of Technology
    2018
    Abstract
    In this paper, the effect of ozone on membrane fouling of membrane bioreactor (MBR) systems was investigated. Sludge specification such as soluble microbial product (SMP), extracellular polymeric substance (EPS), viscosity, particle size distribution (PSD), microscopic observations and sludge volume index (SVI) in presence of ozone were determined. Further, EPS, Fourier-transform infrared (FTIR) analysis, excitation-emission matrix (EEM) fluorescence spectroscopy, and gel permission chromatography (GPC) are considered to determine cake layer characteristics. The results indicated COD removal did not show significant difference with ozonation. Ozone also increases the particle size and... 

    TBsearch: trust based search for unstructured peer-to-peer networks

    , Article Proceedings of the 4th International Conference on Semantics, Knowledge, and Grid, SKG 2008, 3 December 2008 through 5 December 2008, Beijing ; 2008 , Pages 227-234 ; 9780769534015 (ISBN) Mashayekhi, H ; Habibi, J ; Rostami, H ; Sharif University of Technology
    2008
    Abstract
    Effectiveness of P2P systems highly depends on efficiency of their search algorithms. With existence of malicious and dishonest nodes, reputation systems are essential to evaluate the trustworthiness of participating peers and to combat subversive peer behaviours. Surprisingly majority of the available reputation systems, ignore the underlying search algorithm and assume it pre-existing. In this paper we propose TBSearch, a robust and efficient trust based search algorithm for unstructured P2P networks. TBSearch maintains limited size routing indexes combining search and trust data, to guide queries to most reputable nodes. We introduce a low overhead method of estimating peers' reputation... 

    Efficient semantic based search in unstructured peer-to-peer networks

    , Article 2nd Asia International Conference on Modelling and Simulation, AMS 2008, Kuala Lumpur, 13 May 2008 through 15 May 2008 ; 2008 , Pages 71-76 ; 9780769531366 (ISBN) Mashayekhi, H ; Habibi, J ; Rostami, H ; Sharif University of Technology
    2008
    Abstract
    Peer-to-peer networks have gained a tremendous popularity in sharing huge volumes of data. Success of such networks highly depends on the performance of their search algorithm. We propose a semantic based search algorithm for unstructured peer-to-peer networks. In the proposed method we establish ontology based indexes for outgoing links of each node, which are utilized in routing the query through the network. In contrast to available approaches, we maintain limited size indexes and also consider number of documents accessible via each link and the distance between source and destination nodes, to improve the accuracy and efficiency of our algorithm. Our design is scalable and adaptable, to... 

    Fully enriched weight functions in mesh-free methods for the analysis of linear elastic fracture mechanics problems

    , Article Engineering Analysis with Boundary Elements ; Vol. 43 , 2014 , pp. 1-8 Namakian, R ; Shodja, H. M ; Mashayekhi, M ; Sharif University of Technology
    2014
    Abstract
    The so-called enriched weight functions (EWFs) are utilized in mesh-free methods (MMs) to solve linear elastic fracture mechanics (LEFM) problems; the following issues are of concern: convergence behavior; sufficiency of EWFs to capture singular fields around the crack-tip; and the preservation of the J-integral path-independency. EWFs prove useful in conjunction with the moving least square reproducing kernel method (MLSRKM); for this purpose, both EWFs and MLSRKM are modified. Since EWFs are not truly representative of the near-tip solution, fully EWFs (FEWFs) are introduced. Finally, some descriptive examples address the aforementioned concerns and the accuracy and efficacy of the... 

    RKPM approach to elastic-plastic fracture mechanics with notes on particles distribution and discontinuity criteria

    , Article CMES - Computer Modeling in Engineering and Sciences ; Volume 76, Issue 1 , 2011 , Pages 19-60 ; 15261492 (ISSN) Mashayekhi, M ; Shodja, H. M ; Namakian, R ; Sharif University of Technology
    2011
    Abstract
    A meshless method called reproducing kernel particle method (RKPM) is exploited to cope with elastic-plastic fracture mechanics (EPFM) problems. The idea of arithmetic progression is assumed to place particles within the refinement zone in the vicinity of the crack tip. A comparison between two conventional treatments, visibility and diffraction, to crack discontinuity is conducted. Also, a tracking to find the appropriate diffraction parameter is performed. To assess the suggestions made, two mode I numerical simulations, pure tension and pure bending tests, are executed. Results including J integral, crack mouth opening displacement (CMOD), and plastic zone size and shape are compared with... 

    Mining distributed frequent itemsets using a gossip based protocol

    , Article Proceedings - IEEE 9th International Conference on Ubiquitous Intelligence and Computing and IEEE 9th International Conference on Autonomic and Trusted Computing, UIC-ATC 2012 ; 2012 , Pages 780-785 Bagheri, M ; Mirian Hosseinabadi, S. H ; Mashayekhi, H ; Habibi, J ; Sharif University of Technology
    2012
    Abstract
    Recently, there has been a growing attention in frequent itemset mining in distributed systems. In this paper, we present an algorithm to extract frequent itemsets from large distributed datasets. Our algorithm uses gossip as the communication mechanism and does not rely on any central node. In gossip based communication, nodes repeatedly select other random nodes in the system, and exchange information with them. Our algorithm proceeds in rounds and provides all nodes with the required support counts of itemsets, such that each node is able to extract the global frequent itemsets. For local iteration and generation of candidate itemsets, a trie data structure is used, which facilitates the... 

    Development of hysteretic energy compatible endurance time excitations and its application

    , Article Engineering Structures ; Volume 177 , 2018 , Pages 753-769 ; 01410296 (ISSN) Mashayekhi, M ; Estekanchi, H. E ; Vafai, H ; Mirfarhadi, S. A ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    The aim of this study is to develop a new simulation procedure of endurance time excitations in which hysteretic energy compatibility is included. Existing methods for simulating excitations consider only amplitude and frequency content of motions and disregard parameters related to cumulative damage of structures. Hysteretic energy consistency, as a cumulative damage-related parameter, is included in the process. The proposed method is applied to generate new excitations. Efficiency of the proposed method is examined in two ways: (1) comparing damage spectra of simulated excitations with recorded ground motions; (2) applying simulated excitations in seismic assessment of three concrete... 

    An ontology based routing index in unstructured peer-to-peer networks

    , Article 13th International Computer Society of Iran Computer Conference on Advances in Computer Science and Engineering, CSICC 2008, Kish Island, 9 March 2008 through 11 March 2008 ; Volume 6 CCIS , 2008 , Pages 960-963 ; 18650929 (ISSN); 3540899847 (ISBN); 9783540899846 (ISBN) Mashayekhi, H ; Saremi, F ; Habibi, J ; Rostami, H ; Abolhassani, H ; Sharif University of Technology
    2008
    Abstract
    We present an ontology based indexing method for unstructured P2P networks. We maintain limited size indexes at each node to identify number of documents accessible on each concept without loosing any indexing information. Out method supports complex queries, combined of conjunction and disjunction phrases. We simulate our search algorithm on an unstructured P2P network and show that our method significantly reduces the network traffic. © 2008 Springer-Verlag  

    Predicting probabilistic distribution functions of response parameters using the endurance time method

    , Article Structural Design of Tall and Special Buildings ; 2018 ; 15417794 (ISSN) Mashayekhi, M. R ; Mirfarhadi, S. A ; Esmaeilpour Estekanchi, H ; Vafai, H ; Sharif University of Technology
    John Wiley and Sons Ltd  2018
    Abstract
    The main objective of this study is the development of endurance time (ET) excitations in order to take structural response uncertainty into account for use in performance-based earthquake engineering. There are several uncertainties in earthquake engineering, including earthquake occurrence, structural response, damage, and loss. In the current research, structural response uncertainty is directly included in the ET method, which is an analysis method used for performing structural behavior assessment under seismic actions. Conventional practice of the ET method does not provide any information about seismic response distribution. Despite the simplicity of the ET method, it is an accurate... 

    An evolutionary optimization-based approach for simulation of endurance time load functions

    , Article Engineering Optimization ; Volume 51, Issue 12 , 2019 , Pages 2069-2088 ; 0305215X (ISSN) Mashayekhi, M. R ; Esmail pour Estekanchi, H ; Vafai, H ; Ahmadi, G ; Sharif University of Technology
    Taylor and Francis Ltd  2019
    Abstract
    A novel optimization method based on Imperialist Competitive Algorithm (ICA) for simulating endurance time (ET) excitations was proposed. The ET excitations are monotonically intensifying acceleration time histories that are used as dynamic loading. Simulation of ET excitations by using evolutionary algorithms has been challenging due to the presence of a large number of decision variables that are highly correlated due to the dynamic nature of the problem. Optimal parameter values of the ICA algorithm for simulating ETEFs were evaluated and were used to simulate ET excitations. In order to increase the capability of the ICA and provide further search in the optimization space, this... 

    Predicting probabilistic distribution functions of response parameters using the endurance time method

    , Article Structural Design of Tall and Special Buildings ; Volume 28, Issue 1 , 2019 ; 15417794 (ISSN) Mashayekhi, M. R ; Mirfarhadi, A ; Esmail Pour Estekanchi, H ; Vafai, H ; Sharif University of Technology
    John Wiley and Sons Ltd  2019
    Abstract
    The main objective of this study is the development of endurance time (ET) excitations in order to take structural response uncertainty into account for use in performance-based earthquake engineering. There are several uncertainties in earthquake engineering, including earthquake occurrence, structural response, damage, and loss. In the current research, structural response uncertainty is directly included in the ET method, which is an analysis method used for performing structural behavior assessment under seismic actions. Conventional practice of the ET method does not provide any information about seismic response distribution. Despite the simplicity of the ET method, it is an accurate... 

    Predicting probabilistic distribution functions of response parameters using the endurance time method

    , Article Structural Design of Tall and Special Buildings ; Volume 28, Issue 1 , 2019 ; 15417794 (ISSN) Mashayekhi, M. R ; Mirfarhadi, S. A ; E. Estekanchi, H ; Vafai, H ; Sharif University of Technology
    John Wiley and Sons Ltd  2019
    Abstract
    The main objective of this study is the development of endurance time (ET) excitations in order to take structural response uncertainty into account for use in performance-based earthquake engineering. There are several uncertainties in earthquake engineering, including earthquake occurrence, structural response, damage, and loss. In the current research, structural response uncertainty is directly included in the ET method, which is an analysis method used for performing structural behavior assessment under seismic actions. Conventional practice of the ET method does not provide any information about seismic response distribution. Despite the simplicity of the ET method, it is an accurate... 

    Flow mediated dilation with photoplethysmography as a substitute for ultrasonic imaging

    , Article Physiological Measurement ; Volume 36, Issue 7 , 2015 , Pages 1551-1571 ; 09673334 (ISSN) Mashayekhi, G ; Zahedi, E ; Movahedian Attar, H ; Sharifi, F ; Sharif University of Technology
    Institute of Physics Publishing  2015
    Abstract
    Flow mediated dilation (FMD) is a non-invasive method for endothelial function assessment providing an index extracted from ultrasonic B-mode images. Although utilized in the research community, the difficulty of its application and high cost of ultrasonic devices prevent it from being widely used in clinical settings. In this study we show that substituting the ultrasonic device with more easily handled and low cost photoplethysmography and electrocardiography is possible. We introduce new indices based on the photoplethysmogram (PPG) and electrocardiogram (ECG) and show that they are correlated with the ultrasound-based FMD Index. To this end, a conventional ultrasound FMD test was carried... 

    Incorporation of strong motion duration in incremental-based seismic assessments

    , Article Engineering Structures ; Volume 223, Issue 15 , November , 2020 Mashayekhi, M ; Harati, M ; Darzi, A ; Estekanchi, H. E ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    This study proposes a new approach to incorporate motion duration in incremental dynamic assessments. In the proposed methodology, at each intensity level, a simulation-based approach which is verified with actual data is employed to determine the median duration and the median acceleration spectra of ground motions expected to occur at the site. Afterward, at each intensity level, artificial or spectrally matched motions are produced based on the median acceleration spectra and the median duration, indicating that different intensity levels are directly covered by the generated artificial or adjusted motions rather than just scaling up and down a set of recorded ground motions. In the... 

    A new haptic interaction with a visual tracker: implementation and stability analysis

    , Article International Journal of Intelligent Robotics and Applications ; Volume 5, Issue 1 , 2021 , Pages 37-48 ; 23665971 (ISSN) Mashayekhi, A ; Nahvi, A ; Meghdari, A ; Mohtasham Shad, H ; Sharif University of Technology
    Springer  2021
    Abstract
    In this paper, a new haptic interaction is presented where the operator is in contact with the haptic device (HD) only when she/he is in contact with the virtual environment (VE). This is in contrast with traditional haptic systems, where the operator is always in contact with the HD, even if she/he is out of the VE. In this haptic interaction, a visual tracking system is used to track the operator’s finger. When the finger is out of the VE, the HD tracks the finger so that the stylus of the HD keeps a constant distance of about 2 cm from the finger. When the finger gets close to the VE, the stylus slows down and stops upon reaching the VE; it then waits until the operator touches the stylus...