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    Attitudes toward world englishes among iranian english language learners

    , Article Asian Englishes ; 2018 , Pages 1-18 ; 13488678 (ISSN) Rezaei, S ; Khosravizadeh, P ; Mottaghi, Z ; Sharif University of Technology
    Routledge  2018
    Abstract
    The current study investigated the attitudes of 140 Iranian English language learners toward World Englishes. The participants were required to listen to recordings of the same natural speech from a series of speakers with five different accents. The results showed that the participants had a more positive attitude toward American and British English. On the other hand, African-American Vernacular English received the lowest level and Persian English and Australian English were in the middle of this scale. While American English was evaluated as the most socially attractive and African-American as the least socially attractive, British and African-American accents were evaluated as of the... 

    Attitudes toward world englishes among iranian english language learners

    , Article Asian Englishes ; Volume 21, Issue 1 , 2019 , Pages 52-69 ; 13488678 (ISSN) Rezaei, S ; Khosravizadeh, P ; Mottaghi, Z ; Sharif University of Technology
    Routledge  2019
    Abstract
    The current study investigated the attitudes of 140 Iranian English language learners toward World Englishes. The participants were required to listen to recordings of the same natural speech from a series of speakers with five different accents. The results showed that the participants had a more positive attitude toward American and British English. On the other hand, African-American Vernacular English received the lowest level and Persian English and Australian English were in the middle of this scale. While American English was evaluated as the most socially attractive and African-American as the least socially attractive, British and African-American accents were evaluated as of the... 

    EOR potentials in the poststeam-injected heavy oil reservoirs

    , Article Thermal Methods ; 2023 , Pages 355-384 ; 978-012821933-1 (ISBN); 978-012821934-8 (ISBN) Razavifar, M ; Almasiyan, P ; Rezaei, A ; Sharif University of Technology
    Elsevier  2023
    Abstract
    Thermal methods, particularly the in situ steam-based practices, used for oil production from oil sands and heavy oil reservoirs are the leading technology for enhanced oil recovery (EOR) in such reservoirs. However, a majority of these techniques, such as steam-assisted gravity drainage, cyclic steam stimulation, and steam flooding, are on the verge of exhaustion. Yet, the enduring interactions between rock and steam, bitumen recovery, and improving heavy oil recovery are the main challenges in the poststeam injection era. Here, we reviewed the experimental and field applications of the EOR methods and the recovery mechanisms behind each method in the poststeam injection era, in heavy oil... 

    Evaluation of various energy windows at different radionuclides for scatter and attenuation correction in nuclear medicine

    , Article Annals of Nuclear Medicine ; Volume 29, Issue 4 , 2015 , Pages 375-383 ; 09147187 (ISSN) Asgari, A ; Ashoor, M ; Sohrabpour, M ; Shokrani, P ; Rezaei, A ; Sharif University of Technology
    Springer-Verlag Tokyo  2015
    Abstract
    Objective: Improving signal to noise ratio (SNR) and qualified images by the various methods is very important for detecting the abnormalities at the body organs. Scatter and attenuation of photons by the organs lead to errors in radiopharmaceutical estimation as well as degradation of images. The choice of suitable energy window and the radionuclide have a key role in nuclear medicine which appearing the lowest scatter fraction as well as having a nearly constant linear attenuation coefficient as a function of phantom thickness. Methods: The energy windows of symmetrical window (SW), asymmetric window (ASW), high window (WH) and low window (WL) using Tc-99m and Sm-153 radionuclide with... 

    Interdisciplinary challenges and promising theranostic effects of nanoscience in Alzheimer's disease

    , Article RSC Advances ; Volume 2, Issue 12 , 2012 , Pages 5008-5033 ; 20462069 (ISSN) Laurent, S ; Ejtehadi, M. R ; Rezaei, M ; Kehoe, P. G ; Mahmoudi, M ; Sharif University of Technology
    2012
    Abstract
    During the last decade, reports show that the incidence and prevalence of Alzheimer's disease (AD) and other dementias have significantly increased. AD poses an enormous escalating threat to health services and resources. Early diagnosis of AD is recognized as one of the major challenges and primary aims in scientific communities. With the arrival of nanoscience and nanotechnology to medicine, hopes for early diagnosis and treatment of AD have considerably increased. To this end, nanobioresearchers are focused on three major areas consisting of early detection and recognition, biological markers and diagnosis, and pharmacotherapy. Several efforts are in progress for the discovery of new... 

    Generalizing of numerically solving methods of eigenvalue problems to asymmetrical, damping included case

    , Article Proceedings of the 2001 ASME Design Engineering Technical Conference and Computers and Information in Engineering Conference, Pittsburgh, PA, 9 September 2001 through 12 September 2001 ; Volume 1 , 2001 , Pages 401-404 Rezaei, S ; Sharif University of Technology
    2001
    Abstract
    In this paper, "Subspace" method is generalized to asymmetrical case. In the new algorithm described here, "Lanczos" method is used to find the first subspace and to solve the eigenvalue problem resulted in generalized subspace method. To solve the standard eigenvalue problem developed by "Lanczos" method "Jacoby" method is used. If eigenvalue problem includes damping matrix, that will be imported in new defined mass and stiffness matrices  

    An experimental investigation of nanoemulsion enhanced oil recovery: Use of unconsolidated porous systems

    , Article Fuel ; Volume 251 , 2019 , Pages 754-762 ; 00162361 (ISSN) Jalilian, M ; Tabzar, A ; Ghasemi, V ; Mohammadzadeh, O ; Pourafshary, P ; Rezaei, N ; Zendehboudi, S ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    Utilization of nanoparticles in oil and gas industry has attracted considerable attention of engineers and researchers. In this article, the feasibility of nanoemulsion flooding is investigated as a method for Enhanced Oil Recovery (EOR) through coreflooding experiments, using a packed bed and real reservoir fluids. Nine different mixtures of the solvent, surfactant, and nanoparticles in the form of a nanoemulsion phase are generated and used to recover the oil in the context of an EOR process. Various tests are conducted to determine the properties of porous medium and fluids. To study the production performance of this EOR technique, pressure drop across the packed bed are measured, along... 

    A distributed circuit model for side-coupled nanoplasmonic structures with metal-insulator-metal arrangement

    , Article IEEE Journal on Selected Topics in Quantum Electronics ; Volume 18, Issue 6 , March , 2012 , Pages 1692-1699 ; 1077260X (ISSN) Rezaei, M ; Jalaly, S ; Miri, M ; Khavasi, A ; Fard, A. P ; Mehrany, K ; Rashidian, B ; Sharif University of Technology
    IEEE  2012
    Abstract
    A transmission line model is developed for coupled plasmonic metal-insulator-metal (MIM) waveguides. In the proposed model coupling between electric fields of two plasmonic waveguides is modeled by distributed mutual capacitor while distributed mutual inductor accounts for magnetic field coupling. These mutual elements are determined using propagation constants of supermodes of coupled waveguides. The model is applied to analyze coupled line directional coupler and side-coupled rectangular resonators. The effectiveness of the model is assessed using fully numerical finite-difference time-domain (FDTD) technique. The results have excellent agreement with the numerical methods  

    Toward a secure industrial wireless body area network focusing mac layer protocols: an analytical review

    , Article IEEE Transactions on Industrial Informatics ; Volume 19, Issue 2 , 2023 , Pages 2028-2038 ; 15513203 (ISSN) Javadpour, A ; Sangaiah, A. K ; Ja'Fari, F ; Pinto, P ; Memarzadeh Tehran, H ; Rezaei, S ; Saghafi, F ; Sharif University of Technology
    IEEE Computer Society  2023
    Abstract
    Monitoring security and quality of service is essential, due to the rapid growth of the number of nodes in wireless networks. In healthcare/industrial environments, especially in wireless body area networks (WBANs), this is even more important. Because the delays and errors can directly affect patients'/scientists' health. To increase the Monitoring Quality of Services (MQoS) in WBANs, a secure medium access control (MAC) protocol needs to be developed to provide optimal services. This article provides a comprehensive review of MAC protocols in WBANs with a technical security analysis approach. Time-based, contention-based, and hybrid protocols are compared in this article, regarding MQoS... 

    Robust controller design for discrete unstable non-minimum-phase delayed stochastic processes

    , Article International Journal of Control, Automation and Systems ; Volume 11, Issue 5 , 2013 , Pages 893-902 ; 15986446 (ISSN) Rezaei, S ; Shahrokhi, M ; Sharif University of Technology
    2013
    Abstract
    Control of unstable non-minimum-phase delayed stochastic processes is a challenging problem. In this work based on the Diophantine equation and using pole-placement technique, a discrete control scheme for such processes has been proposed. Robust stability of the suggested control structure has been shown. Advantages of the proposed scheme over the existing algorithms have been shown through computer simulations. It has been shown that performance of the proposed scheme for handling model mismatch and colored noise is superior to the previous work proposed in the literature  

    Discussion of "optimal reconfiguration and capacitor allocation in radial distribution systems for energy losses minimization" by L.W. de Oliveira et al., International Journal of Electrical Power and Energy Systems 32 (2010) 840-848

    , Article International Journal of Electrical Power and Energy Systems ; Volume 42, Issue 1 , November , 2012 , Pages 701- ; 01420615 (ISSN) Rezaei, P ; Vakilian, M ; Sharif University of Technology
    2012
    Abstract
    This article indicates the accurate method for load level calculation to solve the power flow problem when capacitor reactive power is involved. Using the correct method causes some changes in the results and conclusion stated in the discussed paper on optimal reconfiguration and capacitor placement in radial distribution systems  

    Optical flow-based obstacle avoidance of a fixed-wing MAV

    , Article Aircraft Engineering and Aerospace Technology ; Volume 83, Issue 2 , 2011 , Pages 85-93 ; 00022667 (ISSN) Rezaei, M ; Saghafi, F ; Sharif University of Technology
    2011
    Abstract
    Purpose - The purpose of this paper is to describe optical flow-based navigation of a very light fixed-wing aircraft in flight between obstacles. Design/methodology/approach - The optical flow information of two cameras mounted on the aircraft is used to detect the obstacle. It is assumed that the image processing has been completed and the optical flow vectors have been obtained beforehand. The optical flow is used to detect the obstacles and make a rapid turn manoeuvre for the aircraft. Findings - It is shown that using the optical flow feedback by itself is unable to give a rapid turn to the aircraft and its rate should be employed into the control law. Six degree-of-freedom flight... 

    Distribution system efficiency improvement by reconfiguration and capacitor placement using a modified particle swarm optimization algorithm

    , Article EPEC 2010 - IEEE Electrical Power and Energy Conference: "Sustainable Energy for an Intelligent Grid", 25 August 2010 through 27 August 2010 ; August , 2010 ; 9781424481880 (ISBN) Rezaei, P ; Vakilian, M ; Sharif University of Technology
    2010
    Abstract
    Capacitor placement/setting is one of the main means for loss reduction and voltage profile improvement in distribution systems. If capacitor placement is meant, the objective function will be the cost of energy losses besides the capacitors costs in a specified period of time. Here, reconfiguration can be used as a strategy to reform the base configuration of the distribution network in order to place the capacitors more efficiently with lower costs. On the other hand, if capacitors are already available in a network, optimum capacitors setting and network reconfiguration should be performed for power loss minimization. In this paper both power loss minimization and capacitor placement cost... 

    Linguistic landscape in the city of isfahan in iran: the representation of languages and identities in julfa

    , Article Multilingua ; Volume 37, Issue 6 , 2018 , Pages 701-720 ; 01678507 (ISSN) Rezaei, S ; Tadayyon, M ; Sharif University of Technology
    Walter de Gruyter GmbH  2018
    Abstract
    This paper reports on the diversity of languages displayed in the linguistic landscape of Julfa district, a largely Armenian dominated area, in the city of Isfahan in Iran. The data included a corpus of 323 photographs taken from the top-down and bottom-up signage in this quarter of the city. Ethnographic fieldwork was also conducted to reach a deeper understanding of the linguistic landscape in Julfa. The results of the analyses indicated that Julfa, as home to Armenians in diaspora and also a luxurious neighborhood frequented by more modern strata of the Isfahani society, is occupied more noticeably with Persian and English language and to a lesser extent with Armenian language. The... 

    Iranian doctoral students’ perceptions of publication in English: Motives, hurdles, and strategies

    , Article Journal of Applied Research in Higher Education ; Volume 11, Issue 4 , 2019 , Pages 941-954 ; 20507003 (ISSN) Rezaei, S ; Seyri, H ; Sharif University of Technology
    Emerald Group Publishing Ltd  2019
    Abstract
    Purpose: The purpose of this paper is to investigate the English for publication purpose practices of doctoral students in Iran. The overall objective was to explore their motives, hurdles and strategies in academic writing. Design/methodology/approach: This case study draws on a narrative inquiry to explore nine science and engineering doctoral students’ perceptions of academic publication. The data were analyzed through a hybrid process of inductive and deductive thematic analysis. Findings: The qualitative results showed three dominant themes, namely: motives for publication, hurdles to publication and strategies for dealing with these challenges were extracted. The main sources of... 

    Cultural identity among Iranian English language teachers

    , Article International Journal of Society, Culture and Language ; Volume 7, Issue 1 , 2019 , Pages 67-82 ; 23292210 (ISSN) Rezaei, S ; Bahrami, A ; Sharif University of Technology
    Lulu Press Inc  2019
    Abstract
    This survey investigated the cultural identity of Iranian English language teachers. Accordingly, a cultural identity model was proposed a priori, based on which a questionnaire was developed and piloted on 50 Iranian English language teachers (α = 0.87). The developed questionnaire was then administered to 636 male and female Iranian English language teachers. The results of confirmatory factor analysis showed that the model was fit and eight components namely 1) religious beliefs, 2) history, 3) customs, 4) manners and behaviors, 5) Persian language, 6) literature and art, 7) parents’ influence and 8) family relations were confirmed to form the core of Iranian cultural identity. The... 

    Iranian EFL learners’ identity construction in a critical reflective course: a case of an online course

    , Article Open Learning ; Volume 35, Issue 1 , 2020 , Pages 63-81 Rezaei, S ; Latifi, A ; Sharif University of Technology
    Routledge  2020
    Abstract
    The present mixed-methods research examined the identity and attitude of Iranian English language learners as a result of their participation in an online critical reflective course. The participants were 38 English language students who attended ten online sessions within a five-month English language course. Their online posts underwent inductive qualitative content analysis and subsequently five themes were extracted. In addition, the content of the first and last two sessions were analysed quantitatively. A validated questionnaire was also administered and 18 participants were interviewed. Qualitative and quantitative content analyses of the data revealed eight finalised codes. The... 

    Flat Ball: Dynamic topology for energy management of optical interconnection networks in data centers

    , Article Optical Switching and Networking ; Volume 48 , 2023 ; 15734277 (ISSN) Rezaei, N ; Koohi, S ; Sharif University of Technology
    Elsevier B.V  2023
    Abstract
    Cloud computing and web applications have further highlighted the need for powerful data centers with large bandwidth and low power consumption. In order to provide such a large bandwidth, today's electronic data centers require high power levels. Furthermore, communications and devices are not always used to their full potential. Optical networks can be a proper option for data centers, as they can offer large and variable bandwidth with lower power consumption compared to their electronic counterparts. In this regard, a dynamic all-optical network architecture is proposed in this paper, with bandwidth reconfiguration capability and low latency to reduce energy consumption. This proposed... 

    Optical Flow Based Flight of a Small Fixed-Wing Aircraft in Ideal Urban Environments

    , Ph.D. Dissertation Sharif University of Technology Rezaei, Mahdi (Author) ; Saghafi, Fariborz (Supervisor)
    Abstract
    This thesis represents the obstacle avoidance of a fixed-wing small aircraft using optical flow information of cameras mounted on the aircraft. The thesis consists of two main sections. In section one, the ideal optical flow has been simulated based on the camera model, complete six DOF of flight equations, and the geometry of the environment. An analytical formula has been derived to relate the obstacle detection distance to the maneuverability of the aircraft. Having the obstacle detection distance, the control and navigation algorithms have been developed to achieve a collision-free flight for the aircraft in urban canyons and junctions. The effect of some parameters such as approach... 

    Design of Robust Digital Circuits Against Soft Errors Considering Multiple Event Transients Fault (METs)

    , M.Sc. Thesis Sharif University of Technology Rezaei, Siavash (Author) ; Miremadi, Ghasem (Supervisor)
    Abstract
    Nowadays, one of the most important challenges in the design of digital circuits is their susceptibility to the strike of high energy particles which leads to the Single Event Transient (SET) and Multiple Event Transients (MET). In fact, technology scaling which results in lower supply voltage, higher operating frequency, and lower nodal capacitance, makes today’s digital circuits more susceptible not only to high energy particles but also to low energy particles. Moreover emerging deep sub-micron technologies and the integration of more cells in today’s chips have caused higher probability of MET occurrences. A lot of research has tried to reduce the soft error rate due to high energy...