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Global prevalence of osteoporosis among the world older adults: a comprehensive systematic review and meta-analysis
, Article Journal of Orthopaedic Surgery and Research ; Volume 16, Issue 1 , 2021 ; 1749799X (ISSN) ; Darvishi, N ; Bartina, Y ; Larti, M ; Kiaei, A ; Hemmati, M ; Shohaimi, S ; Mohammadi, M ; Sharif University of Technology
BioMed Central Ltd
2021
Abstract
Background: Osteoporosis is one of the most common bone system diseases that is associated with an increased risk of bone fractures and causes many complications for patients. With age, the prevalence of this disease increases so that it has become a serious problem among the elders. In this study, the prevalence of osteoporosis among elders around the world is examined to gain an understanding of its prevalence pattern. Methods: In this systematic review and meta-analysis, articles that have focused on prevalence of osteoporosis in the world’s elders were searched with these key words, such as Prevalence, Osteoporosis, Elders, Older adult in the Science Direct, Embase, Scopus, PubMed, Web...
Evaluation of differentiation quality of several differentiation inducers of bone marrow-derived mesenchymal stem cells to nerve cells by as-sessing expression of beta-tubulin 3 marker: A systematic review
, Article Current Stem Cell Research and Therapy ; Volume 16, Issue 8 , 2021 , Pages 994-1004 ; 1574888X (ISSN) ; Zahedi, F ; Hashemi, Z. S ; Khalili, S ; Sharif University of Technology
Bentham Science Publishers
2021
Abstract
Neurological diseases have different etiological causes. Contemporary, developing an ef-fective treatment for these diseases is an ongoing challenge. Cell therapy is recognized as one of the promising solutions for the treatment of these diseases. Amongst various types of stem cells, bone marrow-derived mesenchymal stem cells (BM-MSC) are known to be the most widely used stem cells. These cells are endowed with appealing properties such as the ability to differentiate into other cell types, including the muscle, liver, glial, and nerve cells. In this review study, we have systematically evaluated the ability of a variety of chemical compounds used in the last ten years to differentiate...
Networking capability: a systematic review of literature and future research agenda
, Article Journal of Business and Industrial Marketing ; Volume 37, Issue 1 , 2021 , Pages 160-179 ; 08858624 (ISSN) ; Garousi Mokhtarzadeh, N ; Jafarpanah, I ; Sharif University of Technology
Emerald Group Holdings Ltd
2021
Abstract
Purpose: The purpose of this paper is to scrutinize the existing literature and provide a comprehensive overview by compiling and synthesizing the dispersed body of knowledge in the networking capability (NC) literature stream. Therefore, this review study contributes to the research by presenting a summary of the NC complex construct. Design/methodology/approach: The authors have tried to cover the literature gap in the NC area through a systematic review. Findings: The theoretical contributions of this study to the NC literature stream are fourfold. First, while critically reviewing existing definitions, the authors present an integrated definition of NC. Second, the authors delineate the...
Requirements for adopting software process lines
, Article Journal of Systems and Software ; Volume 164 , 2020 ; Garcia, F ; Piattini, M ; Ramsin, R ; Sharif University of Technology
Elsevier Inc
2020
Abstract
A Software Process Line (SPrL) is potentially suitable for constructing software development methodologies by reusing core assets. However, adopting this approach without prior assessment of its suitability can lead to failure. The aim of this paper is to identify a set of requirements that can be used for deciding whether to adopt the SPrL approach in an organization. Identification of the requirements was accomplished in two stages: the characteristics important in method tailoring were first identified via a Systematic Mapping Study (SMS) that focused on analyzing 43 primary studies; the degree of importance of the identified characteristics was then determined using a questionnaire...
Task scheduling mechanisms in cloud computing: A systematic review
, Article International Journal of Communication Systems ; Volume 33, Issue 6 , 2020 ; Movaghar, A ; Rahmani, A. M ; Sharif University of Technology
John Wiley and Sons Ltd
2020
Abstract
Today, cloud computing has developed as one of the important emergent technologies in communication and Internet. It offers on demand, pay per use access to infrastructure, platforms, and applications. Due to the increase in its popularity, the huge number of requests need to be handled in an efficient manner. Task scheduling as one of the challenges in the cloud computing supports the requests for assigning a particular resource so as to perform effectively. In the resource management, task scheduling is performed where there is the dependency between tasks. Many approaches and case studies have been developed for the scheduling of these tasks. Up to now, a systematic literature review...
Systematic Design of Chassis and Suspension System of a Multi-purpose Vehicle for Transportation, Repair and Cleaning Power Station Water Ways
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
In this thesis, overall design of a multi-purpose vehicle for transportation, repair and cleaning missions in hydro power station water ways during overhaul is presented. Design process is divided into several parts. The main challenges of the project and customer requirements are discussed first. A brief review of electric vehicles history is presented. The conceptual design including initial dimensional calculations, energy analysis and component selection are described in subsequent sections. Finally the structural and dynamic analysis of chassis and suspension system are carried out. To avoid pollution and life hazards to workers, a battery and electric motor drive system is utilized....
Design and application of industrial machine vision systems
, Article Robotics and Computer-Integrated Manufacturing ; Volume 23, Issue 6 , December , 2007 , Pages 630-637 ; 07365845 (ISSN) ; Asadpour, A ; Sharif University of Technology
2007
Abstract
In this paper, the role and importance of the machine vision systems in the industrial applications are described. First understanding of the vision in terms of a universal concept is explained. System design methodology is discussed and a generic machine vision model is reported. Such a machine includes systems and sub-systems, which of course depend on the type of applications and required tasks. In general, expected functions from a vision machine are the exploitation and imposition of the environmental constraint of a scene, the capturing of the images, analysis of those captured images, recognition of certain objects and features within each image, and the initiation of subsequent...
Systematic Design of Low Power Flash ADC
, Ph.D. Dissertation Sharif University of Technology ; Sadughi, Sirus (Supervisor) ; Sharifkhani, Mohamad (Co-Advisor) ; Atarodi, Mojtaba (Co-Advisor)
Abstract
Considering the drastical increasing of greenhouse gases in the atmosphere, especially carbon dioxide, reduction of these gases seems necessary to combat global warming. Fossil fuel power plants are one of the main sources of CO2 emission. In this thesis, CO2 capture from a natural gas fired combined cycle power plant using different oxygen percent in air feed is studied. Aspen Plus was used to evaluate the effect of this capture technology on the plant efficiency and energetic parameters of the system. Aspen Hysys is used to simulate Amine absorption tower and Air Separation cryogenic tower. Since the oxygen production plant, CO2 capture and transport are cost and energy intensive, the cost...
Experimental evaluation of ship squat in shallow waters
, Article Journal of the Brazilian Society of Mechanical Sciences and Engineering ; Vol. 36, Issue. 3 , 2014 , pp. 559-569 ; ISSN: 1806-3691 ; Seif, M. S ; Sharif University of Technology
Abstract
Enlargement of ship size in recent decades and no change in the harbors and approach channels have resulted in global attention toward navigation in shallow and confined waters. A phenomenon which restricts ship navigation in shallow waters is reduction of under-keel clearance in terms of sinkage and dynamic trim, which is called squatting. Due to the complexity of flow around the ship hull, one of the best methods for predicting the ship squat is the experimental approach based on systematic model tests in the towing tank. In this study, model tests for tanker ship model and traditional Persian Gulf and Oman Sea vessel called dhow had been performed in the towing tank and the squat of the...
Crosstalk elimination in the detection of dual-beam optical tweezers by spatial filtering
, Article Review of Scientific Instruments ; Volume 85, Issue 5 , May , 2014 ; ISSN: 00346748 ; Reihani, S. N. S ; Oddershede, L. B ; Sharif University of Technology
Abstract
In dual-beam optical tweezers, the accuracy of position and force measurements is often compromised by crosstalk between the two detected signals, this crosstalk leading to systematic and significant errors on the measured forces and distances. This is true both for dual-beam optical traps where the splitting of the two traps is done by polarization optics and for dual optical traps constructed by other methods, e.g., holographic tweezers. If the two traps are orthogonally polarized, most often crosstalk is minimized by inserting polarization optics in front of the detector; however, this method is not perfect because of the de-polarization of the trapping beam introduced by the required...
Optimal tuning for fractional-order controllers: An integer-order approximating filter approach
, Article Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME ; Volume 135, Issue 2 , July , 2013 ; 00220434 (ISSN) ; Tavazoei, M. S ; Sharif University of Technology
2013
Abstract
This paper offers a systematic framework for the design of suboptimal integer-order controllers based on fractional-order structures. The proposed approach is built upon the integer-order approximations that are traditionally used to implement fractional-order controllers after they are designed. Accordingly, the fractional-order structures are exploited to derive a suitable parameterization for a fixed-structure integer-order controller. The parameters, which describe the structure of the fixed-order integer controller, are the same as those used to describe the original fractional structure. Optimal tuning is then performed in the parameter space of the fractional structure and the...
Toward an equation of state for water inside carbon nanotubes
, Article Journal of Physical Chemistry B ; Volume 116, Issue 16 , April , 2012 , Pages 4943-4951 ; 15206106 (ISSN) ; Parsafar, G. A ; Sharif University of Technology
American Chemical Society
2012
Abstract
Water inside carbon nanotubes as an example of nanoconfined water has gained noticeable attention, in both theoretical and applied aspects. Molecular simulation has played a major role in the studies in this field. Yet, there is a need for systematic study of simulation results and compilation of scientifically reliable predictive relations. Here we present Monte Carlo simulations of water inside carbon nanotubes with different radii. An equation of state which was derived on the basis of the extended Lennard-Jones (12,6,3) as the effective pair potential is chosen for the system of water inside the carbon nanotubes. The equation of state is modified to take the effects of anisotropic...
Cascaded failures in weighted networks
, Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 84, Issue 4 , 2011 ; 15393755 (ISSN) ; Babaei, M ; Jalili, M ; Safari, M ; Sharif University of Technology
2011
Abstract
Many technological networks can experience random and/or systematic failures in their components. More destructive situations can happen if the components have limited capacity, where the failure in one of them might lead to a cascade of failures in other components, and consequently break down the structure of the network. In this paper, the tolerance of cascaded failures was investigated in weighted networks. Three weighting strategies were considered including the betweenness centrality of the edges, the product of the degrees of the end nodes, and the product of their betweenness centralities. Then, the effect of the cascaded attack was investigated by considering the local weighted flow...
Design and implementation of an online precise monitoring and performance analysis system for centrifugal pumps
, Article IEEE Transactions on Industrial Electronics ; 2017 ; 02780046 (ISSN) ; Emami, M. H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
Development of design and production technology of centrifugal pumps for achieving better performance and less energy consumption in these devices has increasingly been taken into consideration. This is due to the fact that centrifugal pumps have an important contribution in industrial applications and energy consumption around the world. Accordingly, the international standards of centrifugal pumps, urge more precise analysis systems for obtaining the performance curves of these pumps. For this reason, a complete, precise and real-time monitoring and performance analysis system for centrifugal pumps is introduced in this paper. The pump characteristics are measured by precise measuring...
Prevalence of hepatitis e infection in the general population of Iran: a systematic review and meta-analysis
, Article Future Virology ; Volume 12, Issue 4 , 2017 , Pages 227-236 ; 17460794 (ISSN) ; Sedighi, M ; Mostafaei, S ; Miri, A ; Amiri, H ; Abiri, R ; Babaei, F ; Kabir, K ; Moghoofei, M ; Sharif University of Technology
Abstract
Aim: Hepatitis E is a form of acute viral hepatitis, which is caused by hepatitis E virus (HEV). The study objective was to evaluate the prevalence of HEV to provide an overall relative frequency in Iran. Methods: In this study, databases such as PubMed and Scopus were searched using the following keywords according to MeSH, "Hepatitis E virus", "Epidemiology", "Enzyme-linked immunosorbent assay (ELISA)" and "Iran". Then studies which had reported prevalence of HEV were selected. Results: We selected 36 researches out of 9246 for our study. From all the samples, the pooled estimated prevalence of HEV positive was 9.7%. It should be noted that HEV infection's relative frequency varied from...
A hybrid control approach for LLC resonant converter
, Article 12th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2021, 2 February 2021 through 4 February 2021 ; 2021 ; 9780738111971 (ISBN) ; Tahami, F ; Barzkar, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
In this paper, a novel hybrid control approach is proposed to control the LLC resonant converter. Since the converter consists of both continuous variables and logical variables, it is intrinsically hybrid. Apart from that, because of fast dynamics of the converter and the fact that there is no closed form solution for discontinuous conduction modes (DCM), modeling and control of the LLC resonant converter is still a challenge. In the authors' previous work, a systematic model was proposed for the converter, the direct piecewise affine model. In this paper, an appropriate controller based on the proposed model is represented and the design procedure is discussed in details; the block diagram...
A systematic decomposition approach of nonlinear systems by combining gap metric and stability margin
, Article Transactions of the Institute of Measurement and Control ; Volume 43, Issue 9 , 2021 , Pages 2006-2017 ; 01423312 (ISSN) ; Haeri, M ; Sharif University of Technology
SAGE Publications Ltd
2021
Abstract
In this paper, in order to control a nonlinear dynamic system via multi-model controller, we propose a systematic approach to determine the nominal local linear models. These models are selected from the local models bank and results in a reduced nominal models set that provides enough information to design a multi-model controller. To determine the initial local models bank, gap metric is used so that the distance between two successive local models is smaller than a threshold value. Then, a systematic approach that aims to get a reduced nominal models bank is developed. Based on this approach, first, a binary gap matrix is defined by combining gap metric and stability information. Then,...
A systematic decomposition approach of nonlinear systems by combining gap metric and stability margin
, Article Transactions of the Institute of Measurement and Control ; Volume 43, Issue 9 , 2021 , Pages 2006-2017 ; 01423312 (ISSN) ; Haeri, M ; Sharif University of Technology
SAGE Publications Ltd
2021
Abstract
In this paper, in order to control a nonlinear dynamic system via multi-model controller, we propose a systematic approach to determine the nominal local linear models. These models are selected from the local models bank and results in a reduced nominal models set that provides enough information to design a multi-model controller. To determine the initial local models bank, gap metric is used so that the distance between two successive local models is smaller than a threshold value. Then, a systematic approach that aims to get a reduced nominal models bank is developed. Based on this approach, first, a binary gap matrix is defined by combining gap metric and stability information. Then,...
Deep learning for caries detection: A systematic review
, Article Journal of Dentistry ; Volume 122 , 2022 ; 03005712 (ISSN) ; Motamedian, S. R ; Rohban, M. H ; Krois, J ; Uribe, S. E ; Mahmoudinia, E ; Rokhshad, R ; Nadimi, M ; Schwendicke, F ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Objectives: Detecting caries lesions is challenging for dentists, and deep learning models may help practitioners to increase accuracy and reliability. We aimed to systematically review deep learning studies on caries detection. Data: We selected diagnostic accuracy studies that used deep learning models on dental imagery (including radiographs, photographs, optical coherence tomography images, near-infrared light transillumination images). The latest version of the quality assessment tool for diagnostic accuracy studies (QUADAS-2) tool was used for risk of bias assessment. Meta-analysis was not performed due to heterogeneity in the studies methods and their performance measurements....
A systematic method for the complex walls no-slip boundary condition modeling in dissipative particle dynamics
, Article Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1253-1260 ; 10263098 (ISSN) ; Saidi, M. S ; Sharif University of Technology
2011
Abstract
The dissipative particle dynamics method is an efficient method for studying the hydrodynamics of complex fluids. One of the most challenging aspects of this method appears when the solid walls exist. The solid walls disturb the homogeneity of the fluid near the wall and cause some spurious fluctuations. Thus, in recent years a large amount of effort has been devoted to solve this shortcoming. Fortunately the mentioned problem has almost been solved for the simple walls such as flat walls, circular cylinders, spheres, etc. However no systematic model has addressed the complex walls. It should be noted that almost all of the walls we deal with in practical problems such as MEMS devices,...