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    Crystalline polysaccharides: A review

    , Article Carbohydrate Polymers ; Volume 275 , 2022 ; 01448617 (ISSN) Seidi, F ; Yazdi, M. K ; Jouyandeh, M ; Habibzadeh, S ; Munir, M. T ; Vahabi, H ; Bagheri, B ; Rabiee, N ; Zarrintaj, P ; Saeb, M. R ; Sharif University of Technology
    Elsevier Ltd  2022
    The biodegradability and mechanical properties of polysaccharides are dependent on their architecture (linear or branched) as well as their crystallinity (size of crystals and crystallinity percent). The amount of crystalline zones in the polysaccharide significantly governs their ultimate properties and applications (from packaging to biomedicine). Although synthesis, characterization, and properties of polysaccharides have been the subject of several review papers, the effects of crystallization kinetics and crystalline domains on the properties and application have not been comprehensively addressed. This review places focus on different aspects of crystallization of polysaccharides as... 

    Echelon Inventory Model with Fuzzy approach and Heuristic Solution for Supply Chain Management

    , M.Sc. Thesis Sharif University of Technology Atef Yekta, Hoda (Author) ; Akbari Jokar, Mohammad Reza (Supervisor)
    This Project describes a new model for Inventory management in Supply Chain (SC), based on Fuzzy Set Theory and Echelon Inventory model. In today’s changing market, managing the Supply chain inventories, especially for the new product becomes more complicated and uncertain than before. This work provides a new approach to model uncertainties involved in supply chain management using fuzzy set theory. For achieving a more realistic model, Echelon Inventory is used as the base of integrated supply chain inventory model. In proposed model, some of input parameters like demand, production parameters, transportation time between inventories, and some of variables like lead times are described as... 

    Determination of the Optimal Policy in a Two Level Inventory System, Using Information Sharing, with a Different Order Size

    , Ph.D. Dissertation Sharif University of Technology Yazdan Shenas, Nima (Author) ; Eshraghniaye Jahromi, Abdolhamid (Supervisor)
    To coordinate between different echelons in supply chains, it is necessary to analyze the multi-echelon inventory systems. Access to advanced technologies in Information Technology make some changes in the inventory management in these systems. Theses technologies that were gradually got inexpensive are attractive for researchers of the multi-echelon inventory systems. Using theses technologies, the information that leads to costs reduction in a supply chain is accessible economically. In this thesis, first efficient solutions for Base Stock and Reorder point, Quantity of order policies will be derived. Then, a serial two-level supply chain comprised of one retailer and one supplier will be... 

    Inventory Ordering System with Fuzzy Parameters in Supply Chain

    , M.Sc. Thesis Sharif University of Technology Nasiri, Mohsen (Author) ; Hajji, Rasool (Supervisor)
    Inventory control has been always considered important due to its prominent role in managing and better application of resources in the field of operational systems. Ordering system or review stock policy in supply chain management can be mentioned as one of the inventory control study fields of management. A lot of researches have been done in investigating ordering system in supply chain under certainty conditions; however, since the real world is full of uncertainties, parameters such as demand cannot be predicted exactly and we encounter with ambiguity. In this case, using crisp (exact) values can cause to decide wrongly (a wrong decision). On the other hand, due to absence of sufficient... 

    Recommending Aspect Changes for Mobile Apps Via Mining Users’ Reviews

    , M.Sc. Thesis Sharif University of Technology Mehralian, Forough (Author) ; Heydarnoori, Abbas (Supervisor)
    Dental implants should be biocompatible. This ability cause bone growth beside implant and increases stability of implant. Manufactoring method and materials used in implants are main parameters affectig biocompatibility of implants. Fabrication of functionally graded structures is a novel method to increase biocompatibility. Stress shielding is one of the main causes of failures in current dental implants. This phenomenon takes place due to different young modulus of dental implants and host bone. Pouros structures remedial this problem and implant’s young modulus comes closer to host bone. The aim of this project is to study feasibily of fabrication of functionally graded titanium dental... 

    Analysing Purchase Satisfaction Using Opinion Mining

    , M.Sc. Thesis Sharif University of Technology Derakhshan, Ali (Author) ; Beigy, Hamid (Supervisor)
    Opinions and experiences of others give us valuable information in making decisions. Recently, with the expansion of using social networks and websites, people can easily share their opinions about miscellaneous things. This huge amount of information cannot be analyzed by individuals, so a system that automatically analyzes opinions is needed. This need invokes new field of research that is called opinion mining. User’s viewpoints could change during the time, and this is an important issue for companies. One of the most challenging sub-problems of opinion mining is model-based opinion mining, which aims to model the generation of words by modeling their probabilities. In this thesis, we... 

    Hierarchical Classification of Mobile App Reviews

    , M.Sc. Thesis Sharif University of Technology Mazraeh Khatiri, Sajad (Author) ; Heydarnoori, Abbas (Supervisor)
    Mobile application marketplaces are not only a distribution platform but also a place for users to give feedback on their experience with application. User reviews contain useful information for software evolution tasks including bug reports, user experience, and feature requests. Considering the massive number of reviews that popular apps receive every day, manual inspection of reviews is not feasible in many cases. Researchers have developed automated tools to classify reviews into fixed and general-purpose categories related to software evolution in order to assist developers. Although this classification can reduce the time and effort for mobile developers, it does not consider the... 

    Classifying Users’ Reviews to Respond in App Stores

    , M.Sc. Thesis Sharif University of Technology Majidi, Forough (Author) ; Heydarnoori, Abbas (Supervisor)
    In recent years, the number of applications in app stores such as Google Play has increased dramatically. In Google Play, people can write a review and give a rate to each application. Each review contains a lot of notable information such as ‘feature request’ which helps with software maintenance. Also, the user rate is a sign of user satisfaction or dissatisfaction. Users can change their reviews and rate anytime they want. The previous studies show that total rating affects the success of apps and the total number of downloads. They also found that a lot of users take the rating as one of the important factors while downloading the app and they usually don’t download the apps which have... 

    Strategic Network Formation for Software Development Teams

    , M.Sc. Thesis Sharif University of Technology Mosaddegh, Pooya (Author) ; Fazli, Mohammad Amin (Supervisor) ; Ghodsi, Mohammad (Co-Supervisor)
    Strategic Network Formation defines how and why networks take particular forms. In many networks, the relation between nodes is determined by the choice of the participating players involved, not by an arbitrary rule. A "strategic2 modeling of network requires defining a network’s costs and benefits and predicts how individual preferences become outcomes. In strategic network formation it is important to look at the overall social benefit and to see if networks that players create manage to be efficient for the society in general. The code review process also referred to as peer review, stands out as a tried and tested method in a large palette of applications to allow... 

    Deriving the Cost Function and Optimal Boundaries for a Two-level Inventory System with Information Sharing and Identical Retailers

    , M.Sc. Thesis Sharif University of Technology Afshar Sedigh, Amir Hosein (Author) ; Haji, Rasoul (Supervisor)
    In this study we consider a two-level supply chain, with a supplier and a number of identical retailers, demand process is Poisson with random rate. All retailers apply (R,Q) policy with backorder case for their inventory control supplier fulfills the orders of retailers according to FIFO discipline. At any point of time the supplier has online information about inventory position of all retailers.
    Whenever the inventory position of a retailer reaches to a fixed value (s) above its reorder point, the supplier orders a batch of size Q to an outside source with infinite capacity. Lead-time of each retailer is equal to the sum of a constant transportation time and a delay time which is... 

    Development and application of model for planning and development of technology in Oil & Gas Upstream

    , M.Sc. Thesis Sharif University of Technology Kanani Maman, Yasser (Author) ; Saboohi, Yadollah (Supervisor)
    Products on Research and Development (R&D) are followed by Technology development. Projects on R&D are cost intensive and considerable of financial resources should be allocated. Optimal allocation of resources could be managed through cost effective strategy. Hence, a “Model for planning and development of technology” has been developed in the present work, which lends itself to the analysis of the industrial application of planning of technological development based on minimizing costs of both development and application of a technology. Mixed Integer Programming optimization model has been developed which enables studying the structure of R&D activities. This model is based on the concept... 

    Spotlight on kinetic and equilibrium adsorption of a new surfactant onto sandstone minerals: A comparative study

    , Article Journal of the Taiwan Institute of Chemical Engineers ; Volume 50 , May , 2015 , Pages 12-23 ; ISSN: 18761070 Arabloo, M ; Ghazanfari, M. H ; Rashtchian, D ; Sharif University of Technology
    This paper presents a state of the art review of adsorption models for a new plant-based surfactant adsorption onto sandstone minerals. The adsorption data at both kinetic and equilibrium modes were obtained from batch experiments. Four adsorption kinetic models, five two-parameter, and six three-parameter equilibrium models were used for interpretation of the obtained data. Among the two and three-parameter isotherm models applied, the Jovanovic and the Khan isotherms showed the best fit, respectively. And the pseudo-second order model presented a better fit than other kinetic models. Finally, a computer-based modeling approach was developed and used for predicting the kinetics of... 

    Experimental design in analytical chemistry -Part I: Theory

    , Article Journal of AOAC International ; Vol. 97, issue. 1 , 2014 , pp. 3-11 ; ISSN: 10603271 Ebrahimi-Najafabadi, H ; Leardi, R ; Jalali-Heravi, M ; Sharif University of Technology
    This paper reviews the main concepts of experimental design applicable to the optimization of analytical chemistry techniques. The critical steps and tools for screening, including Plackett-Burman, factorial and fractional factorial designs, and response surface methodology such as central composite, Box-Behnken, and Doehlert designs, are discussed. Some useful routines are also presented for performing the procedures  

    On competence of vendor managed inventory in supply chains using basic mathematical inventory models

    , Article Scientia Iranica ; Vol. 21, issue. 3 , 2014 , p. 1061-1071 Jasemi, M ; Haji, A ; Gharibi, M ; Sharif University of Technology
    In this study, a two-echelon single-vendor supply chain is selected to do a cost-based comparison between short-term performances of a Vendor Managed Inventory (VMI) and a Retailer Managed Inventory (RMI). While the inventory costs include ordering and storing expenses, the rate of consumption and the price of goods are constant, the rate of production and pace of transportation are infinite and shortage is not allowed. This paper, after a comprehensive literature review, is followed by three cases of single retailer, n-retailer and two-retailer chains. Unlike the second case, in the first case, VMI shows an absolute superiority to RMI, and this is the reason for devising the third case in... 

    A review of ignition delay and combustion characteristics of biodiesel fueled diesel engine

    , Article Applied Mechanics and Materials ; Volume 390 , 2013 , Pages 333-337 ; 16609336 (ISSN) ; 9783037858332 (ISBN) Qate, M ; Pourabdian, M ; Javareshkian, A ; Farzbod, A ; Sharif University of Technology
    Increasing rate of demanding biodiesel as alternative energy resource, persuade researchers to investigate engine performance of biodiesel-fueled engines, which are highly influenced by ignition delay (ID) and combustion characteristics of such a fuel. This review article introduces a literature review on ignition delay (ID) and combustion characteristics of diesel engine fueled with biodiesel. Slightly difference between combustion characteristics of bio fueled engine and petroleum diesel one recognized as result of carried out investigations. Early start of combustion (SOC) and shorter ID of biodiesel comparing to diesel is reported by most of investigations. Lower compressibility, higher... 

    Carbon nanotubes in cancer therapy: A more precise look at the role of carbon nanotube-polymer interactions

    , Article Chemical Society Reviews ; Volume 42, Issue 12 , Feb , 2013 , Pages 5231-5256 ; 03060012 (ISSN) Adeli, M ; Soleyman, R ; Beiranvand, Z ; Madani, F ; Sharif University of Technology
    Despite the great potential of carbon nanotubes (CNTs) in various areas of biomedicine, concerns regarding their carcinogenicity, inefficient dispersion in aqueous solutions and biological activity in vivo still remain. One important and feasible route to overcome these barriers is modification of CNTs with polymers, which are widely studied and play a vital role in biological and biomedical fields, especially in drug delivery. This comprehensive review focuses on the achievements of our and other groups in currently used methods to functionalize the surface of CNTs with polymers to produce anticancer drug delivery systems. We have intensively studied covalent and noncovalent interactions... 

    A comprehensive formulation for railroad blocking problem

    , Article Proceedings - 27th European Conference on Modelling and Simulation, ECMS 2013 ; May , 2013 , Pages 758-763 Hasany, R. M ; Shafahi, Y ; Kazemi, S. F ; Sharif University of Technology
    European Council for Modelling and Simulation  2013
    In rail transportation, there have been several attempts to determine the best routes for shipments (a number of cars with the same origin-destination) through the network. Shipments enter into several intermediate yards on their routes to separate and regroup shipments into new trains. Most of time, every entering into a yard includes excessive delay for shipments; therefore it is an ideal plan that each shipment has been transported by an exclusive train service. Mainly because of restriction on a number of running trains, this plan cannot be adapted in most cases. Finding the optimal route over the rail network with above and other common constraints would be handled by railroad blocking... 

    Ranking of technology transfer barriers in developing countries; case study of Iran's biotechnology industry

    , Article IEEE International Conference on Industrial Engineering and Engineering Management, 6 December 2011 through 9 December 2011, Singapore ; 2011 , Pages 1602-1606 ; 21573611 (ISSN) ; 9781457707391 (ISBN) Yazdani, K ; Rashvanlouei, K. Y ; Ismail, K ; Sharif University of Technology
    In this paper, first we shall define a list of technology transfer barriers in the biotechnology field through interviews and literature reviews. Next, we shall categorize them into four major categories of technology, and at last introduce all of the hypotheses on the existence of relationship between each part of technology and failure in the technology transfer process. Questionnaires consisting of two parts were created and handed out to all of the specialists and biotechnology idea-holders in the Iranian National Research center of Biotechnology, Lidco Co, Iran Pastor Institute, Biotechnology Department of University of Tehran, etc. Going on, we've evaluated the factors' validity... 

    A queueing system with inventory and mixed exponentially distributed lead times

    , Article International Journal of Advanced Manufacturing Technology ; Volume 53, Issue 9-12 , August , 2011 , Pages 1231-1237 ; 02683768 (ISSN) Saffari, M ; Haji, R ; Hassanzadeh, F ; Sharif University of Technology
    We consider M/M/1/∞ systems with inventory in which completing each service in the queueing system requires an on-hand inventory. Continuous review (r, Q) policy is considered for the inventory system, and lead times are assumed to be mixed exponentially distributed. During stockout, arriving demands get rejected from the queue and become lost (lost sale situation). We derive stationary distribution of product form of joint queue length and on-hand inventory. The resulting distribution is employed to compute performance measures which can be used to derive the optimal policy. Optimal order size for predetermined reorder policy is initially determined and finally, optimal reorder point and... 

    Nanomedicine applications in orthopedic medicine: State of the art

    , Article International Journal of Nanomedicine ; Volume 10 , 2015 , Pages 6039-6054 ; 11769114 (ISSN) Mazaheri, M ; Eslahi, N ; Ordikhani, F ; Tamjid, E ; Simchi, A ; Sharif University of Technology
    Dove Medical Press Ltd  2015
    The technological and clinical need for orthopedic replacement materials has led to significant advances in the field of nanomedicine, which embraces the breadth of nanotechnology from pharmacological agents and surface modification through to regulation and toxicology. A variety of nanostructures with unique chemical, physical, and biological properties have been engineered to improve the functionality and reliability of implantable medical devices. However, mimicking living bone tissue is still a challenge. The scope of this review is to highlight the most recent accomplishments and trends in designing nanomaterials and their applications in orthopedics with an outline on future directions...