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    Exploring worker's absence pattern in the construction industry in Iran

    , Article Scientia Iranica ; Volume 28, Issue 2 , 2021 , Pages 586-597 ; 10263098 (ISSN) Alvanchi, A ; Hashemi, A ; Sharif University of Technology
    Sharif University of Technology  2021
    Workers' absence considerably a ects the performance of labor-intensive construction projects. Identifying such absence patterns assists construction project managers in preparing proper project organization, reducing the absence rate, and improving the project performance. Despite its critical role, no study has investigated the absence pattern in the construction industry in Iran. This study addresses this gap by identifying the worker's absence pattern and providing recommendations to reduce the absence rate. First, a comprehensive literature review is conducted on the impacts of in uential factors in the worker's absence. Then, a questionnaire-based survey is designed and distributed... 

    Assessment of public-private partnership in traveler information provision

    , Article Transportation Research Record ; Issue 2394 , 2013 , Pages 19-29 ; 03611981 (ISSN) Bagloee, S ; Kermanshah, M ; Bozic, C ; Sharif University of Technology
    National Research Council  2013
    Making efficient use of transportation infrastructure has always been a concern. Traveler information provisions (TIPs) assist commuters in making better travel decisions and therefore lead to increased mobility and more efficient travel. The ongoing economic crisis and shrinking public funding have made the public-private partnership (PPP) an attractive instrument for promoting TIP. Such initiatives have been much discussed in developed countries. The use of PPP to fund public projects in developing countries, however, is in its infancy, and the related issues do not receive adequate attention in the literature. In this study, PPP opportunities in TIP were assessed in the case of a city in... 

    Advances in multicore systems architectures

    , Article Journal of Supercomputing ; Volume 71, Issue 8 , August , 2015 , Pages 2783-2786 ; 09208542 (ISSN) Sarbazi Azad, H ; Bagherzadeh, N ; Jaberipour, G ; Sharif University of Technology
    Kluwer Academic Publishers  2015
    The special issue of the Journal of Supercomputers presents recent research results on multicore systems where contributions cover different topics such as architecture, programming tools and applications, as well as other related aspects of multicore systems design. Contributed papers include some of the high-quality papers accepted at the CADS 2013 conference that took place in Tehran, which were selected based on the evaluation scores and presentation quality at the conference. The review process required three rounds of diligent reviews and revisions resulting in the final accepted manuscripts for publication in the journal  

    What happened to complex product systems literature over the last two decades: progresses so far and path ahead

    , Article Technology Analysis and Strategic Management ; Volume 30, Issue 8 , 2018 , Pages 948-966 ; 09537325 (ISSN) Safdari Ranjbar, M ; Park, T. Y ; Kiamehr, M ; Sharif University of Technology
    Routledge  2018
    Complex product systems (CoPS) industries largely contribute to industrial development, economic growth and creation of national wealth in both developed and developing economies. CoPS also show a number of specific characteristics as a distinctive category of industrial products in comparison with mass-produced consumer goods. These aspects have attracted the attention of scholars to study CoPS over the last two decades, resulting in a fairly extensive body of literature on the subject. However, there is a further need to connect research findings in this area, to illustrate a macro view of the development in the field, explore common themes, and identify possible paths into the future.... 

    Insights into TripAdvisor's online reviews: The case of Tehran's hotels

    , Article Tourism Management Perspectives ; Volume 34 , April , 2020 Khorsand, R ; Rafiee, M ; Kayvanfar, V ; Sharif University of Technology
    Elsevier B. V  2020
    User-generated data in TripAdvisor.com consists of considerable amount of useful information that can help managers to provide better services to their customers. This study aims to forecast a new user's rate to a hotel based on information of the hotel and user. To do so, all reviews on all hotels of Tehran on TripAdvisor.com as real data are selected and 8 different supervised machine learning models are applied to the data to select the best method including K-nearest neighbors (KNN), Naïve Bayes, decision tree, logistic regression, support vector machine, neural network, random forest, and gradient boosting. KNN algorithm which uses similarity and distance measures for classification is... 

    Optimal solution for a two-level inventory system with information exchange leading to a more computationally efficient search

    , Article Applied Mathematics and Computation ; Volume 189, Issue 2 , 2007 , Pages 1341-1349 ; 00963003 (ISSN) Sajadifar, M ; Haji, R ; Sharif University of Technology
    In this paper we consider a two-level inventory system with one warehouse and one retailer with information exchange. The retailer applies fixed order size continuous review policy. The supplier starts with m initial batches of the same order size of the retailer, and places an order to an outside source immediately after the retailer's inventory position reaches an amount equal to the retailer's order point plus a fixed value s. Transportation times are constant and the retailer faces independent Poisson demand. In a recent paper it was pointed out that the optimal supplier policy in this inventory system is an open question. To obtain the optimal policy for this system, first we find the... 

    A parameter-tuned genetic algorithm to optimize two-echelon continuous review inventory systems

    , Article Expert Systems with Applications ; Volume 38, Issue 9 , September , 2011 , Pages 11708-11714 ; 09574174 (ISSN) Pasandideh, S. H. R ; Niaki, S. T. A ; Tokhmehchi, N ; Sharif University of Technology
    This paper deals with a two-echelon inventory system for a non-repairable item where the system consists of one warehouse and m identical retailers and uses continuous-review (R, Q) ordering policy. To find an effective stocking policy for this system, a mathematical model with the objective of minimizing the total annual inventory investment subject to constraints on the average annual order frequency, expected number of backorders, and budget is formulated. The mathematical model of the problem at hand is shown to be nonlinear integer-programming and hence a parameter-tuned genetic algorithm is proposed to solve it efficiently. A numerical example is provided at the end to illustrate the... 

    A Game Theoretic Inventory Model for a Two-Echelon Supply Chain with Poisson Demand

    , M.Sc. Thesis Sharif University of Technology Alaei, Saeed (Author) ; Hajji, Alireza (Supervisor)
    In this research, we study the differences between the centralized and decentralized approaches in a two-stage serial supply chain including a manufacturer and a retailer under the lost sale policy. The centralized approach results in optimal solution of the system and the decentralized one is based on Stackelberg game in which the manufacturer is the leader. The retailer uses the continuous review (r, Q) policy and the demand arrives according to the stationary Poisson process. In order to obtain the solution for two approaches, a set of computational steps are developed. Furthermore, we provide a numerical example and the corresponding sensitivity analysis to compare the two approaches.... 

    A Review on Rationality Governing Feyerabend`S Philosophy of Science

    , M.Sc. Thesis Sharif University of Technology Ziaie, Mohammad Kamal (Author) ; Golshani, Mehdi (Supervisor)
    Paul Feyerabend, an Austrian philosopher of science, is known as one of major critics of science and philosophy of science in 20th century. This inquiry is an attempt to study and criticize the bedrock of Feyerabend's philosophy of science. In the first chapter there will be an intruduction to enter the subject. In the second chapter the method of this study will be explained. Third chapter is a reconstruction of Feyerabend's philosophy of science. In the 4th chapter bedrock of Feyerabend's philosophy of science is derived to be: scepticism and fighting against dogmatism, defying monopolization, humanistic concerns and his personal character. In the last chapter there will be criticisms on... 

    A Mobile Application Recommender System Based on User's Reviwes

    , M.Sc. Thesis Sharif University of Technology Mossein, Mobasher (Author) ; Heydarnoori, Abbas (Supervisor)
    The ever increasing growth of smart phones and their applications have led to the emergence of various platforms, i.e. online stores, for distributing them among users and providing a way for customers and developers to interact with each other. In recent years, these stores have turned into an important form of software repositories, which brought out new challenges for researchers. One of these challenges is the task of searching for suitable applications and providing simple access to them for users. Pervious work has focused on the relationships between users and applications’ contents. Among the shortcomings of these approaches, is not considering users’ reviews of applications and what... 

    Predicting Usefulness of Code Review Comments Using Machine Learning Algorithms

    , M.Sc. Thesis Sharif University of Technology Mohammadi, Atefeh (Author) ; Fazli, Mohammad Amin (Supervisor)
    The competition for staying in the business world has intensified today with the rise of open-source and commercial software. As long as a software is tailor-made to suit the needs of users, it is so-called alive and can stay in the competition. So the maintenance phase is necessary to make changes to the software to meet the needs of users. To reduce costs associated with this phase, it is necessary to avoid software bugs. One way to avoid software bugs is to use peer code review. Peer code review has been recognized as one of the best software engineering principles of the last 35 years. This principle helps maintain the quality of the code due to changes made to parts of the code that... 

    Extracting Bugs from Mobile Apps Users’ Reviews and Localizing Bug Referenced in Source Code Files

    , M.Sc. Thesis Sharif University of Technology Ghanadi, Fatemeh (Author) ; Heydarnoori, Abbas (Supervisor)
    In recent years, with the rise of the smartphones, mobile apps have seen unprecedented growth and their stores have gained popularity among users. The direct connection of users to these stores and the ability to comment on the applications, have made them big repositories of information. In particular, user reviews provide developers with valuable information on strengths and weaknesses of application and users' problems when using it, which can serve as a guide to improve their application.There are a lot of research on exploring user reviews but few have been trying to find a link between reviews and source code of application. In this research, for the first time, all of the code... 

    Shared information in a serial inventory system [electronic resource]

    , Article International Journal of Advanced Operations Management - IJAOM ; 2011 Vol.3, No.2 pp.101 - 121 Yazdanshenas, N. (Nima) ; Eshraghniaye Jahromi, Abdolhamid ; Eshghi, Kourosh ; Sharif University of Technology
    In this study, a supply chain model consisting of a single product, one supplier and one retailer is considered. Transportation times are constant and demands at the retailer are assumed to be generated by a stationary Poisson process. Demands not covered immediately from inventory are backordered. The retailer carries inventory and replenishes stock according to a (Q, R) policy. The supplier has online information about the demand at the retailer and uses this information to replenish its stock. The order size at the supplier is a multiple integer to the retailer's order size. Considering order costs for the retailer and the supplier, we derive the exact cost function for this inventory... 

    Experimental design in analytical chemistry - Part II: Applications

    , Article Journal of AOAC International ; Vol. 97, issue. 1 , 2014 , p. 12-18 Ebrahimi-Najafabadi, H ; Leardi, R ; Jalali-Heravi, M ; Sharif University of Technology
    This paper reviews the applications of experimental design to optimize some analytical chemistry techniques such as extraction, chromatography separation, capillary electrophoresis, spectroscopy, and electroanalytical methods  

    A decision tool for accelerated bridge construction

    , Article PCI Journal ; Volume 58, Issue 2 , 2013 , Pages 48-63 ; 08879672 (ISSN) Saeedi, A ; Emami, S ; Doolen, T. L ; Tang, B ; Sharif University of Technology
    Accelerated bridge construction is recognized as an important method for bridge owners to accelerate the delivery of highway bridge projects. While the potential advantages of accelerated bridge construction are recognized, it is difficult for transportation specialists to quantify the risks and benefits of using accelerated bridge construction compared with conventional construction for specific bridge replacement or rehabilitation projects. A tool set, based on the analytic hierarchy process, is prepared for transportation specialists and decision makers to determine whether accelerated bridge construction is more effective than traditional construction for a given bridge replacement or... 

    Determination of the economical policy of a three-echelon inventory system with (R, Q) ordering policy and information sharing

    , Article International Journal of Advanced Manufacturing Technology ; Volume 55, Issue 5-8 , 2011 , Pages 831-841 ; 02683768 (ISSN) Hajiaghaei-Keshteli, M ; Sajadifar, S. M ; Haji, R ; Sharif University of Technology
    In this work, we consider a three-echelon serial inventory system with two warehouses (suppliers) and one retailer with information exchange. The retailer applies continuous review (R, Q) policy. The warehouses have online information on the inventory position and demand activities of the retailer. We present a new ordering policy to share information among inventory echelons. The warehouse I and II start with m 1 and m 2 initial batches of the same order size of the retailer, respectively. The warehouse I places an order to an outside source immediately after the retailer's inventory position reaches an amount equal to the retailer's order point plus a fixed value s 1, and the warehouse II... 

    Manufacturing of hydrogel biomaterials with controlled mechanical properties for tissue engineering applications

    , Article Acta Biomaterialia ; Volume 62 , 2017 , Pages 42-63 ; 17427061 (ISSN) Vedadghavami, A ; Minooei, F ; Mohammadi, M. H ; Khetani, S ; Rezaei Kolahchi, A ; Mashayekhan, S ; Sanati Nezhad, A ; Sharif University of Technology
    Hydrogels have been recognized as crucial biomaterials in the field of tissue engineering, regenerative medicine, and drug delivery applications due to their specific characteristics. These biomaterials benefit from retaining a large amount of water, effective mass transfer, similarity to natural tissues and the ability to form different shapes. However, having relatively poor mechanical properties is a limiting factor associated with hydrogel biomaterials. Controlling the biomechanical properties of hydrogels is of paramount importance. In this work, firstly, mechanical characteristics of hydrogels and methods employed for characterizing these properties are explored. Subsequently, the most... 

    Pricing of Vehicle-to-Grid Services in a Microgrid by Nash Bargaining Theory

    , Article Mathematical Problems in Engineering ; Volume 2017 , 2017 ; 1024123X (ISSN) Sarparandeh, M. H ; Ehsan, M ; Sharif University of Technology
    Hindawi Publishing Corporation  2017
    Owners of electric vehicles (EVs) can offer the storage capacity of their batteries to the operator of a microgrid as a service called vehicle-to-grid (V2G) to hold the balance between supply and demand of electricity, particularly when the microgrid has intermittent renewable energy sources. Literature review implies that V2G has economic benefits for both microgrid operator and EV owners, but it is unclear how these benefits are divided between them. The challenge grows when the policy makers rely on the V2G revenue as an incentive for expanding the penetration of EVs in the automotive market. This paper models the interaction between microgrid operator and EV owners as a bargaining game... 

    Carbosilane dendrimers: Drug and gene delivery applications

    , Article Journal of Drug Delivery Science and Technology ; Volume 59 , 2020 Rabiee, N ; Ahmadvand, S ; Ahmadi, S ; Fatahi, Y ; Dinarvand, R ; Bagherzadeh, M ; Rabiee, M ; Tahriri, M ; Tayebi, L ; Hamblin, M. R ; Sharif University of Technology
    Editions de Sante  2020
    Carbosilane dendrimers are a particular type of dendrimer structure that has been used as delivery vehicles for drugs and nucleic acids. They have a defined structure according to their generation number, and their terminal groups can be rendered cationic or anionic. The cationic charges can address the limitation of electrostatic repulsion between the negatively charged phosphate groups of nucleic acids and negatively charged cell membranes. Specific drugs can be loaded into the central part of the dendrimer or attached at the exterior, and the overall positive charge may improve the efficacy of anti-inflammatory drugs. One promising feature of dendrimers is their non-toxicity both in vitro... 

    Exact evaluation of a two sourcing supply chain with order splitting and information sharing

    , Article 2008 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2008, Singapore, 8 December 2008 through 11 December 2008 ; 2008 , Pages 1835-1839 ; 9781424426300 (ISBN) Sajadifar, M ; Hendi, A. M ; Haji, R ; Sharif University of Technology
    We consider a single item, two-level inventory system which consisting of two suppliers and one retailer. Transportation times are constant. The retailer faces Poisson demands and applies continuous (R,Q) policy. Each supplier starts with m initial batches of size Q/2 and places an order in a batch of size Q/2 to an outside source immediately after the retailer's inventory position reaches R+s. In this paper using the idea of the one-for-one ordering policy, we derive the exact value of the expected total cost in the convergent coordinated supply chain. © 2008 IEEE