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    Economic Cooperation Organization: Ex-post Impact and Potentials on Intra-group Trade in Non-Oil Industries Using Gravity Model

    , M.Sc. Thesis Sharif University of Technology Mesgari, Iman (Author) ; Abedini, Javad (Supervisor)
    Abstract
    International trade arrangements have been considerably developed in recent decadees. Especially, one can note the role of these factors in economic development and improvement of life standards in member countries. In the meantime, Economic Cooperation Organization (ECO) was established in 1985, by Iran, Pakistan and Turkey and then extended by seven other countries: Afghanistan, Azerbaijan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan. Improving economic development and intra-group trade of member countries is one of the main objectives for the group. The purpose of this research is to estimate the ex-post effects of ECO on the intra-group trade of member countries.... 

    Causal structure of the EFQM excellence model among healthcare sector: a case study in Iran

    , Article Total Quality Management and Business Excellence ; 2015 ; 14783363 (ISSN) Mesgari, I ; Kamali Miab, A ; Sadeghi, M. J ; Sharif University of Technology
    Routledge  2015
    Abstract
    This paper aims to find the causal structure among the criteria of European Foundation for Quality Management (EFQM) excellence model in the organisations of the healthcare sector to prioritise improvement actions for excellence in hospitals. In this regard, a framework of relations among the criteria of EFQM model is developed by theoretical studies and then, this framework is tested based on the results of self-evaluations performed in Iran public hospitals using the Structural Equation Modelling statistical technique. The required data have been collected from 40 public hospitals from 30 provinces and more than 1200 senior and middle managers of clinical departments of the Iran healthcare... 

    Causal structure of the EFQM excellence model among healthcare sector: a case study in Iran

    , Article Total Quality Management and Business Excellence ; Volume 28, Issue 5-6 , 2017 , Pages 663-677 ; 14783363 (ISSN) Mesgari, I ; Kamali Miab, A ; Sadeghi, M. J ; Sharif University of Technology
    Routledge  2017
    Abstract
    This paper aims to find the causal structure among the criteria of European Foundation for Quality Management (EFQM) excellence model in the organisations of the healthcare sector to prioritise improvement actions for excellence in hospitals. In this regard, a framework of relations among the criteria of EFQM model is developed by theoretical studies and then, this framework is tested based on the results of self-evaluations performed in Iran public hospitals using the Structural Equation Modelling statistical technique. The required data have been collected from 40 public hospitals from 30 provinces and more than 1200 senior and middle managers of clinical departments of the Iran healthcare... 

    The utilization of patients’ information to improve the performance of radiotherapy centers: A data-driven approach

    , Article Computers and Industrial Engineering ; Volume 172 , 2022 ; 03608352 (ISSN) Moradi, S ; Najafi, M ; Mesgari, S ; Zolfagharinia, H ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    The high demand for radiotherapy services, combined with the limited capacity of available resources, patient unpunctuality, and series of appointments, makes Patient Appointment Scheduling (PAS) in radiotherapy centers very challenging. Although most centers use a First-Come-First-Serve (FCFS) policy for appointment scheduling, this approach does not consider patients’ behaviors, and consequently, it performs poorly. This type of inappropriate scheduling usually leads to inefficiency at the center and/or patient dissatisfaction. This study provides a data-driven approach to patient appointment scheduling to deal with the challenges mentioned above, and it considers patients’ histories of... 

    An Optimization Model for Designing an Appointment-Making Procedure for Outpatients–Case Study: Milad Hospital Clinic

    , M.Sc. Thesis Sharif University of Technology Mesgari, Sara (Author) ; Eshghi, Kourosh (Supervisor) ; Delavari, Vahid (Co-Supervisor)
    Abstract
    Patient scheduling is one of the most important problems in healthcare optimization which has been in center of attention in various environments including outpatient clinics and operating rooms. Effective scheduling systems have the goal of matching the demand with capacity so that resources are better utilized and patient waiting times are minimized. Furthermore, patient scheduling can be merged with another problem in which the main goal is to find the optimal sequence of a given list of patients. Moreover, there are several sources of uncertainty such as patients’ unpunctuality, absence, and service time in this problem resulting in having a very complex problem. In this research,... 

    Neural Network Design and Optimization for Porosity Estimation with Using Seismic Attributs

    , M.Sc. Thesis Sharif University of Technology Mesgari, Davood (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Badakhshan, Amir (Supervisor)
    Abstract
    Todays, the most important thing in the oil and gas fields is how to find the main properteis as porosity and permeability; therefere in this project was tryed to estimate to correct porosity in the reservoir area with using estimated porosity from siesmic attributes. For this study Mishrif reservoir in Sarvak formation was selected and the used data are 3D siesmic and also corrected porosity estimated by analysing siesmic attributes from five wells. For combination sresmic and log data, Simulated Annealing was seleted as a Neural Network optimizer for this project.
     

    Degradation of benzene, toluene, and xylene (BTX) from aqueous solution by isolated bacteria from contaminated sites

    , Article Research on Chemical Intermediates ; Volume 41, Issue 1 , January , 2015 , Pages 265-275 ; 09226168 (ISSN) Mesgari Shadi, A ; Yaghmaei, S ; Vafaei, F ; Khataee, A. R ; Hejazi, M. S ; Sharif University of Technology
    Kluwer Academic Publishers  2015
    Abstract
    The present study was carried out to evaluate the degradation efficiency of benzene, toluene, and xylene (BTX) by isolated bacteria from various petroleum-hydrocarbons contaminated sites. Five isolated bacteria were selected for testing BTX biodegradation from liquid culture media. Each of these bacteria was able to degrade BTX but with different efficiencies. Maximum biodegradation efficiency for benzene (more than 70 %) was obtained by Gram-positive coccobacillus, Gram-positive coccus and Gram-negative bacillus bacteria, for toluene (60 %) and xylene (70 %) by Gram-positive coccobacillus and Gram-negative coccobacillus. It was found that the presence of xylene in the substrate mixture... 

    Conformal invariance and quantum aspects of matter

    , Article International Journal of Modern Physics A ; Volume 15, Issue 7 , 2000 , Pages 983-988 ; 0217751X (ISSN) Motavali, H ; Salehi, I. I ; Golshani, M ; Sharif University of Technology
    2000
    Abstract
    The vacuum sector of the Brans-Dicke theory is studied from the viewpoint of a non-conformally invariant gravitational model. We show that, this theory can be conformally symmetrized using an appropriate conformal transformation. The resulting theory allows a particle interpretation, and suggests that the quantum aspects of matter may be geometrized  

    The study on resolution factors of LPBF technology for manufacturing superelastic NiTi endodontic files

    , Article Materials ; Volume 15, Issue 19 , 2022 ; 19961944 (ISSN) Chernyshikhin, S.V ; Pelevin, I. A ; Karimi, F ; Shishkovsky, I. V ; Sharif University of Technology
    MDPI  2022
    Abstract
    Laser Powder Bed Fusion (LPBF) technology is a new trend in manufacturing complex geometric structures from metals. This technology allows producing topologically optimized parts for aerospace, medical and industrial sectors where a high performance-to-weight ratio is required. Commonly the feature size for such applications is higher than 300–400 microns. However, for several possible applications of LPBF technology, for example, microfluidic devices, stents for coronary vessels, porous filters, dentistry, etc., a significant increase in the resolution is required. This work is aimed to study the resolution factors of LPBF technology for the manufacturing of superelastic instruments for... 

    Emergent de Sitter cosmology near black hole horizon

    , Article Journal of High Energy Physics ; Volume 2022, Issue 11 , 2022 ; 10298479 (ISSN) Rasulian, I. M ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    Abstract
    We propose an effective model for an exponentially expanding universe in the brane-world scenario. The setup consists of a 5D black hole and a brane close to the black hole horizon. In case the brane acquires a specific configuration, which we deduce from stability arguments, the induced metric outside the black hole horizon on the brane becomes de Sitter in static coordinates. Studying the Einstein equations perturbatively we find the effective gravity on the brane at this level and derive the 4D gravitational constant. Considering a homogeneous and isotropic fluid in the corresponding FLRW coordinates we find that the bulk fluid density inside the brane, which has the same equation of... 

    Numerical and theoretical study of performance and mechanical behavior of pem-fc using innovative channel geometrical configurations

    , Article Applied Sciences (Switzerland) ; Volume 11, Issue 12 , 2021 ; 20763417 (ISSN) Al-Bonsrulah, H. A. Z ; Alshukri, M. J ; Alsabery, A. I ; Hashim, I ; Sharif University of Technology
    MDPI  2021
    Abstract
    Proton exchange membrane fuel cell (PEM-FC) aggregation pressure causes extensive strains in cell segments. The compression of each segment takes place through the cell modeling method. In addition, a very heterogeneous compressive load is produced because of the recurrent channel rib design of the dipole plates, so that while high strains are provided below the rib, the domain continues in its initial uncompressed case under the ducts approximate to it. This leads to significant spatial variations in thermal and electrical connections and contact resistances (both in rib–GDL and membrane–GDL interfaces). Variations in heat, charge, and mass transfer rates within the GDL can affect the... 

    Numerical and theoretical study of performance and mechanical behavior of pem-fc using innovative channel geometrical configurations

    , Article Applied Sciences (Switzerland) ; Volume 11, Issue 12 , 2021 ; 20763417 (ISSN) Al-Bonsrulah, H. A. Z ; Alshukri, M. J ; Alsabery, A. I ; Hashim, I ; Sharif University of Technology
    MDPI  2021
    Abstract
    Proton exchange membrane fuel cell (PEM-FC) aggregation pressure causes extensive strains in cell segments. The compression of each segment takes place through the cell modeling method. In addition, a very heterogeneous compressive load is produced because of the recurrent channel rib design of the dipole plates, so that while high strains are provided below the rib, the domain continues in its initial uncompressed case under the ducts approximate to it. This leads to significant spatial variations in thermal and electrical connections and contact resistances (both in rib–GDL and membrane–GDL interfaces). Variations in heat, charge, and mass transfer rates within the GDL can affect the... 

    Predicting communication quality in construction projects: A fully-connected deep neural network approach

    , Article Automation in Construction ; Volume 139 , 2022 ; 09265805 (ISSN) Rahimian, A ; Hosseini, M. R ; Martek, I ; Taroun, A ; Alvanchi, A ; Odeh, I ; Sharif University of Technology
    Elsevier B.V  2022
    Abstract
    Establishing high-quality communication in construction projects is essential to securing successful collaboration and maintaining understanding among project stakeholders. Indeed, poor communication results in low productivity, poor efficiency, and substandard deliverables. While high-quality communication is recognized as contingent on the interpersonal skills of workers, the impacts of communication quality on job performance remain unknown. This study addresses this deficiency by developing a method to evaluate construction workers' communication quality. A literature review is undertaken to capture salient interpersonal skills. Leadership style, listening, team building, and clarifying... 

    A robust multilevel segment description for multi-class object recognition

    , Article Machine Vision and Applications ; Vol. 26, issue. 1 , 2014 , pp. 15-30 ; ISSN: 0932-8092 Mostajabi, M ; Gholampour, I ; Sharif University of Technology
    2014
    Abstract
    We present an attempt to improve the performance of multi-class image segmentation systems based on a multilevel description of segments. The multi-class image segmentation system used in this paper marks the segments in an image, describes the segments via multilevel feature vectors and passes the vectors to a multi-class object classifier. The focus of this paper is on the segment description section. We first propose a robust, scale-invariant texture feature set, named directional differences (DDs). This feature is designed by investigating the flaws of conventional texture features. The advantages of DDs are justified both analytically and experimentally. We have conducted several... 

    Reduced memory requirement in hardware implementation of SVM classifiers

    , Article ICEE 2012 - 20th Iranian Conference on Electrical Engineering, 15 May 2012 through 17 May 2012 ; May , 2012 , Pages 46-50 ; 9781467311489 (ISBN) Esmaeeli, S ; Gholampour, I ; Sharif University of Technology
    2012
    Abstract
    Support Vector Machine (SVM) is a powerful machine-learning tool for pattern recognition, decision making and classification. SVM classifiers outperform other classification technologies in many applications. In this paper, two implementations of SVM classifiers are presented using Logarithmic Number System. In the basic classifier all operations (multiplication, addition and ...) are performed using logarithmic numbers. In the logarithmic domain, multiplication and division can be simply treated as addition or subtraction respectively. The main disadvantage of LNS is the large memory requirement for high precision addition and subtraction. In the improved classifier, multiplication... 

    Optimization of supercritical carbon dioxide extraction of essential oil from spearmint (Mentha spicata L.) leaves by using Taguchi methodology

    , Article Journal of Supercritical Fluids ; Volume 67 , July , 2012 , Pages 123-130 ; 08968446 (ISSN) Ansari, K ; Goodarznia, I ; Sharif University of Technology
    2012
    Abstract
    In this study, the essential oil of aerial parts species of a plant called Spearmint was extracted by CO 2 to optimize the results of the supercritical extraction process. In order to achieve maximum total yield extraction and SF-CO 2 concentration, tests were done in a laboratorial pilot considering the Taguchi method under following condition: pressure. 90,100,140,170 bar, temperature. of 35, 40, 45, 50 °C, mean particles size: 250,500,710,1000 μm, flow rate 1,3,5,8 ml/s and dynamic time 30,50,90,120 min. The optimizing conditions for SCE and SF-CO 2 concentration are: 90 bar, 45 °C, 500 μm, 5 ml/s, 120 min and 90 bar, 35 °C, 250 μm, 1 ml/s, 30 min. SCE total yield and CO 2 concentration... 

    A framework based on the Affine Invariant Regions for improving unsupervised image segmentation

    , Article 2012 11th International Conference on Information Science, Signal Processing and their Applications, ISSPA 2012 ; 2012 , Pages 17-22 ; 9781467303828 (ISBN) Mostajabi, M ; Gholampour, I ; Sharif University of Technology
    2012
    Abstract
    Processing time and segmentation quality are two main factors in evaluation of image segmentation methods. Oversegmentation is one of the most challenging problems that significantly degrade the segmentation quality. This paper presents a framework for decreasing the oversegmentation rate and improving the processing time. Significant variations in both color and texture spaces are the main reasons that lead to oversegmentation. We exploit Affine Invariant Region Detectors to mark regions with high variations in both color and texture spaces. The results are then utilized to reduce the oversegmentation rate of image segmentation algorithms. The performance of the proposed framework is... 

    Geometry, supertransfer, and optimality in the light harvesting of purple bacteria

    , Article Journal of Physical Chemistry Letters ; Volume 7, Issue 19 , 2016 , Pages 3804-3811 ; 19487185 (ISSN) Baghbanzadeh, S ; Kassal, I ; Sharif University of Technology
    American Chemical Society  2016
    Abstract
    The remarkable rotational symmetry of the photosynthetic antenna complexes of purple bacteria has long been thought to enhance their light harvesting and excitation energy transport. We study the role of symmetry by modeling hypothetical antennas whose symmetry is broken by altering the orientations of the bacteriochlorophyll pigments. We find that in both LH2 and LH1 complexes, symmetry increases energy transfer rates by enabling the cooperative, coherent process of supertransfer. The enhancement is particularly pronounced in the LH1 complex, whose natural geometry outperforms the average randomized geometry by 5.5 standard deviations, the most significant coherence-related enhancement... 

    Low-cholesterol milk production using cholesterol oxidase from Nocardia erythropolis

    , Article Australian Journal of Dairy Technology ; Volume 65, Issue 1 , 2010 , Pages 10-14 ; 00049433 (ISSN) Serajzadeh, S ; Alemzadeh, I ; Sharif University of Technology
    2010
    Abstract
    An effective process for reducing milk cholesterol by enzymatic treatment was investigated in this study. Cholesterol oxidase from Nocardia erythropolis was used for this purpose. The target of this investigation was to obtain the optimum operational conditions for bioconversion of milk cholesterol by cholesterol oxidase (COD). The bioconversion process was investigated first, to obtain basic information about the process, and was further optimised by analysing the parameters, including temperature, pH, incubation time and enzyme content, by using the Taguchi Approach, which is a statistical method for optimisation. Also the direct effect of each parameter on cholesterol bioconversion rate... 

    Distinguishing the roles of energy funnelling and delocalization in photosynthetic light harvesting

    , Article Physical Chemistry Chemical Physics ; Volume 18, Issue 10 , 2016 , Pages 7459-7467 ; 14639076 (ISSN) Baghbanzadeh, S ; Kassal, I ; Sharif University of Technology
    Royal Society of Chemistry  2016
    Abstract
    Photosynthetic complexes improve the transfer of excitation energy from peripheral antennas to reaction centers in several ways. In particular, a downward energy funnel can direct excitons in the right direction, while coherent excitonic delocalization can enhance transfer rates through the cooperative phenomenon of supertransfer. However, isolating the role of purely coherent effects is difficult because any change to the delocalization also changes the energy landscape. Here, we show that the relative importance of the two processes can be determined by comparing the natural light-harvesting apparatus with counterfactual models in which the delocalization and the energy landscape are...