Loading...
Search for: ataie--ali
0.16 seconds

    Modeling and Evaluation of Performability in Cloud Computing Considering Power Consumption

    , Ph.D. Dissertation Sharif University of Technology Ataie Dadavi, Ehsan (Author) ; Movaghar, Ali (Supervisor)
    Abstract
    Considering current problems in performance evaluation of the Cloud and its management policies and strategies, this thesis presents different approaches for simultaneous evaluation of the performance, dependability, and power consumption of Infrastructure-as-a-Service (IaaS) clouds. The proposed approaches use Stochastic Reward Nets (SRNs) and Stochastic Activity Networks (SANs) to model and evaluate performability and power consumption of cloud systems. In all of the proposed approaches, the cloud resource management system is power-aware. It means that idle Physical Machines (PMs), network equipment, and supporting subsystems are kept in powered-off or standby modes, as much as possible,... 

    Experimental and Numerical Investigation of the Flow Field around Complex Bridge Piers with and without the Scour Hole

    , Ph.D. Dissertation Sharif University of Technology Beheshti, Ali Asghar (Author) ; Ataie Ashtiani, Behzad (Supervisor)
    Abstract
    Local scour around bridge piers is one of the main causes of bridge failures Application of existing equations to complex flow patterns is problematic and often leads to questionable results in the field applications. A lack of understanding of the complex flow field and erosion mechanisms seems to be at least partly responsible for this state. Despite the rapid expansion of the literature on the flow around cylindrical piers, there are still challenges for flow field comprehension and estimating design scour depths around complex bridge piers. Due to geotechnical and economical reasons, bridge designs often leads to a complex foundation. Laboratory studies of local scour around complex... 

    Enhanced Neural Source Localization by Exploiting the Relation between EEG and fMRI

    , M.Sc. Thesis Sharif University of Technology Ataie, Ali (Author) ; Amini, Arash (Supervisor) ; Ghazizadeh Ehsaei, Ali (Supervisor)
    Abstract
    Electroencephalography (EEG) and the functional magnetic resonance imaging (fMRI) are the two important non-invasive tools in probing the neural activity of human brain. EEG has a high temporal resolution while suffering a low spatial one. On the other hand, fMRI has a superior spatial resolution while offering a low temporal one. Enhancement of the spatial resolution of EEG source localization methods is of high importance due to multiple reasons such as its lower capital and operational costs compared with fMRI, its mobility and ease of use and extra. But all the EEG source localization methods have been the subject to a major problem, and it is absence of a ground-truth about the real... 

    Numerical Analysis of Flow Pattern around Pile Groups (Two Piles)

    , M.Sc. Thesis Sharif University of Technology Dashtpeyma, Hamed (Author) ; Ataie Ashtiani, Behzad (Supervisor) ; Beheshti, Ali Asghar (Co-Advisor)
    Abstract
    Numerical simulations and large eddy simulations (LES) of turbulent flow around single pile, circular tandem piles, circular and square side-by-side piles at different spacing ratios (centre to centre distance to the pile diameter) with flow Reynolds number of 105 on the fixed flat-bed are presented. The calculations are performed using a computational fluid dynamics model, FLOW-3D, which solves the Navier-Stokes equations in three dimensions with finite volume method. Numerical simulations are validated by comparing the numerical results of time-averaged flow patterns around single and side-by-side piles with that of the experimental measurements. At the downstream of single pile,... 

    Declaration of Conflicts of Interest in Networking Era: Raising the Bar

    , Article Science and Engineering Ethics ; 2015 , Pages 1-3 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2015

    Preface: Thematic issue “Landslide-generated tsunamis waves”

    , Article Landslides ; 2016 , Pages 1- ; 1612510X (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Verlag  2016

    Erratum to: Preface: Thematic issue “Landslide-generated tsunami waves”

    , Article Landslides ; Volume 13, Issue 6 , 2016 , Pages 1593- ; 1612510X (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Verlag  2016
    Abstract
    The original version of this article, unfortunately, contained error. In the article title, “tsunamis” should be “tsunami“. Given in this article is the correct title  

    Declaration of conflicts of interest in networking era: Raising the bar

    , Article Science and Engineering Ethics ; Volume 22, Issue 6 , 2016 , Pages 1855-1857 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2016

    Recruitment processes in academia: does the emperor have any clothes?

    , Article Science and Engineering Ethics ; Volume 22, Issue 5 , 2016 , Pages 1565-1568 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2016
    Abstract
    The final outcome of promotion and recruitment processes in universities should be conventional and plausible by the members of the relevant scientific community, to affirm that the processes have been competitive and fair. The objective of this opinion letter is to make a plea for the importance of the post-auditing and quantitative assessment of the selection criteria. It is shown that for an example case the outcome of the post-audit does not look reasonable from an external point of view, at least regarding the research competency. © 2015, Springer Science+Business Media Dordrecht  

    Recruitment processes in academia: does the emperor have any clothes?

    , Article Science and Engineering Ethics ; 2015 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Kluwer Academic Publishers  2015
    Abstract
    The final outcome of promotion and recruitment processes in universities should be conventional and plausible by the members of the relevant scientific community, to affirm that the processes have been competitive and fair. The objective of this opinion letter is to make a plea for the importance of the post-auditing and quantitative assessment of the selection criteria. It is shown that for an example case the outcome of the post-audit does not look reasonable from an external point of view, at least regarding the research competency  

    Comment on "effects of tidal fluctuations on mixing and spreading in coastal aquifers: Homogeneous case" by María Pool et al

    , Article Water Resources Research ; Volume 51, Issue 6 , 2015 , Pages 4858- ; 00431397 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Blackwell Publishing Ltd  2015

    Curbing Iran's academic misconduct

    , Article Science ; Volume 351, Issue 6279 , 2016 , Pages 1273-1274 ; 00368075 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    American Association for the Advancement of Science  2016

    World map of scientific misconduct

    , Article Science and Engineering Ethics ; 2017 , Pages 1-4 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2017
    Abstract
    A comparative world map of scientific misconduct reveals that countries with the most rapid growth in scientific publications also have the highest retraction rate. To avoid polluting the scientific record further, these nations must urgently commit to enforcing research integrity among their academic communities. © 2017 Springer Science+Business Media B.V  

    Erratum to: world map of scientific misconduct

    , Article Science and Engineering Ethics ; 2017 , Pages 1- ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    2017

    Erratum to: World map of scientific misconduct

    , Article Science and Engineering Ethics ; Volume 24, Issue 5 , 2018 , Pages 1657- ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2018
    Abstract
    The original version of this article was revised: Reference ‘Qiu, J. (2010). China drought highlights future climate threats. Nature, 463(7278), 142–143.’ has been replaced by ‘Qui, J. (2010). Publish or perish in China. Nature, 463(7278), 142–143.’. © Springer Science+Business Media B.V. 2017  

    World map of scientific misconduct

    , Article Science and Engineering Ethics ; Volume 24, Issue 5 , 2018 , Pages 1653-1656 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2018
    Abstract
    A comparative world map of scientific misconduct reveals that countries with the most rapid growth in scientific publications also have the highest retraction rate. To avoid polluting the scientific record further, these nations must urgently commit to enforcing research integrity among their academic communities. © 2017, Springer Science+Business Media B.V  

    Chinese and Iranian scientific publications: Fast growth and poor ethics

    , Article Science and Engineering Ethics ; Volume 23, Issue 1 , 2017 , Pages 317-319 ; 13533452 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    Springer Netherlands  2017

    MODSharp: Regional-scale numerical model for quantifying groundwater flux and contaminant discharge into the coastal zone

    , Article Environmental Modelling and Software ; Volume 22, Issue 9 , 2007 , Pages 1307-1315 ; 13648152 (ISSN) Ataie Ashtiani, B ; Sharif University of Technology
    2007
    Abstract
    In this paper the development of a quasi-three-dimensional numerical model that can be used for quantifying groundwater inputs and associated contaminant discharged from coastal aquifers into the coastal zone at a regional scale is presented. The present model is called MODSharp. In order to handle problems at a regional scale, the sharp interface approach which is used for conceptualising seawater intrusion, is applied to this model. This model can be used for the simulation of groundwater flow and contaminant transport in layered coastal aquifers at a regional scale. The method of characteristics is used to solve the advection-dispersion equation, which governs contaminant transport in... 

    Performance evaluation of mobile ad hoc networks in the presence of energy-based selfishness

    , Article 2006 3rd International Conference on Broadband Communications, Networks and Systems, BROADNETS 2006, San Jose, CA, 1 October 2006 through 5 October 2006 ; 2006 ; 1424404258 (ISBN); 9781424404254 (ISBN) Ataie, E ; Movaghar, A ; Sharif University of Technology
    2006
    Abstract
    Cooperation of nodes for routing and packet forwarding is inevitable in a mobile ad hoc network. Selfishness in such networks is a significant challenge and can cause network performance to noticeably degrade. In this paper, we propose some new selfishness models elicited from psychological behavior of human beings. We also evaluate performance of MANET in the presence of different percentages of selfish nodes that act based on our selfishness models. Results show that energy-based selfishness is a serious problem that could affect performance depends on mobility of nodes, density of network, and time of simulation. This kind of selfishness needs a comprehensive mechanism to cope with and we... 

    Synthesis and Characterization of Cis-dioxomolybdenum(VI) Complex with an ONO Type Tridentate Schiff base Ligand and its Application as Catalyst for Epoxidation of Olefins

    , M.Sc. Thesis Sharif University of Technology Ataie, Saeed (Author) ; Bagherzadeh, Mojtaba (Supervisor)
    Abstract
    A new dioxomolybdenum(VI) complex, (Cis-[MoO2(L)])n, has been synthesized by reacting 4-bromo-2-((2-hydroxy-5-methylphenylimino)methyl)phenol as a ligand and [MoO2(acac)2] in methanolic solution. For characterization and structure determination of the synthesized complex, different techniques were performed such as elemental analyses, 1H NMR, IR, UV-Vis and X-ray crystallography. The complex was tested as a catalyst for the homogeneous epoxidation of olefins, using tert-butyl hydperoxide (TBHP) as an oxidant. The catalytic system showed high yield, selectivity and turnover number in olefin epoxidation reactions under atmospheric conditions. For example, when the molar ratio of catalyst,...