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    An innovative design and cost optimization of a trigeneration (combined cooling, heating and power) system

    , Article International Journal of Environmental Research ; Volume 8, Issue 4 , 2014 , Pages 971-978 ; ISSN: 17356865 Abbaspour, M ; Saraei, A. R ; Sharif University of Technology
    Abstract
    Load management and cost optimization are among the important factors in trigeneration systems and combined cooling, heating and power (CCHP) systems. In this study, an innovative CCHP system uses a gas turbine as the prime mover and has a heat recovery steam generator (HRSG) in addition to an auxiliary boiler, electric and absorption chillers. The system is tied with the bulk electric grid; to export and sell excess power or import power when necessary. This study analyzes load management and cost optimization of CCHP systems. A heuristic strategy to optimize the total energy cost is then presented. The optimal size of CCHP is determined from the study results. This paper proposes a model... 

    Corrigendum: partial replacement of copper slag with treated crumb rubber aggregates in alkali-activated slag mortar” (construction and building materials (2020) 256, (S0950061820314732), (10.1016/j.conbuildmat.2020.119468))

    , Article Construction and Building Materials ; Volume 283 , 2021 ; 09500618 (ISSN) Ameri, F ; Shoaei, P ; Reza Musaeei, H ; Zareei, A. R ; Chee Ban, C ; Sharif University of Technology
    Elsevier Ltd  2021
    Abstract
    The authors regret that there was an error in the SEM image presented in Fig. 4(c) of the previously print version of the article. Please refer to the corrected SEM image as presented here. It is noteworthy that this change does not affect any of the conclusions. The authors would like to apologise for any inconvenience caused. © 2021 Elsevier Ltd  

    Airlines maintenance cost analysis using system dynamics modeling

    , Article 30th Congress of the International Council of the Aeronautical Sciences, ICAS 2016, 25 September 2016 through 30 September 2016 ; 2016 ; 9783932182853 (ISBN) Fouladi, E ; Farkhondeh, F ; Khalili, N ; Abedian, A ; Sharif University of Technology
    International Council of the Aeronautical Sciences  2016
    Abstract
    Maintenance costs in airlines change as time passes. As airplane ages, it needs more often and more expensive checks. Due to these growing expenses, airlines are getting more interested in cost analysis. Under financial pressure, they avoid buying new airplanes and try to maintain the old ones, but sometimes try to cut the maintenance costs by ignoring or delaying some checks. In other words, they are more disposed to spend small amount of money frequently through time, than to spend a great deal on a new airplane with low maintenance costs. Therefore, in such situations, the following questions raise that what solution is more efficient as we look dynamically to the system? For answering... 

    Dairy Products Distribution Cost Analysis

    , M.Sc. Thesis Sharif University of Technology Alirezaei Shahraki, Karim (Author) ; Ghasemi Tari, Farhad (Supervisor)
    Abstract
    Distribution network is a part of the country’s economic that its structure is affected by economic evolutions. Improper operation and irrational structure of distribution system increases the price of goods and services and creates discontent and makes unreasonable expectations in producers and consumers. In addition, it causes severe fluctuations of price, loses of resources, lack of clarity, reduction of purchasing power, turmoil in market operation, and creation of unofficial distribution networks in society. This investigation focuses on analysis of distribution part of dairy products and tends to evaluate prices and presents solutions to reform prices of distribution. This research... 

    Human Capital Management Using a Quantitative (Value Engineering) Approach in Projects

    , M.Sc. Thesis Sharif University of Technology Rostamali, Mahmoud (Author) ; Hajji, Alireza (Supervisor)
    Abstract
    Project is defined as all activities with a definite beginning (start) and end (finish) aiming to achieve a defined target through defined resources. Literature reviews in the field of project management have shown the importance of project management capabilities for evaluation and optimization. There are many factors in project management which can lonely disrupt the timing and progress of the project. One of the most important factors that in effective and unfortunately has been less measured due to its intangible characteristic in the project is known to be the "human factor". This factor is involved from the first day a project starts and will continue till the end of the project.... 

    A model for assured software download on mobile terminals

    , Article Proceedings - 2009 WRI International Conference on Communications and Mobile Computing, CMC 2009, 6 January 2009 through 8 January 2009, Kunming, Yunnan ; Volume 2 , 2009 , Pages 432-436 ; 9780769535012 (ISBN) Sabetghadam, S ; Niamanesh, M ; Esmaeili, J ; Sharif University of Technology
    2009
    Abstract
    Over-the-air (OTA) software download is a key enabling technology for terminal reconfigurations. With increasing the number of network protocols, variety of software products with different software providers and new software threats, it becomes important to download and install assured software on the mobile terminals. Most of the related research works on downloading assured software, focus on software validation after download, and mainly on the terminal. In this paper, a model is proposed in which an Assurance Agency is exploited. This agency is responsible for performing software examination and validations. Unlike related work, examination and validation operations are centrally... 

    Techno-economic feasibility of a solar-powered reverse osmosis desalination system integrated with lithium battery energy storag

    , Article Desalination and Water Treatment ; Volume 167 , 2019 , Pages 57-74 ; 19443994 (ISSN) Meratizaman, M ; Abbasi Godarzi, A ; Sharif University of Technology
    Desalination Publications  2019
    Abstract
    Today, energy and fresh water play a vital role in human life and the development of economics and also in industry. The energy density in water desalination process is remarkable, so using the renewable energy sources for this purpose can be interesting especially in the high potential renewable energy sources (solar energy) like Middle East. The simulation and feasibility study of solar water desalination system coupled with lithium battery energy storage is considered in the case study of Iran. For these purposes, a complete simulation of the considered system is done. Then, using simulation results, the economic study is carried out using tem economic method. Also, the parametric study... 

    Life cycle cost optimization of earthquake-resistant steel framed tube tall buildings

    , Article Structures ; Volume 30 , 2021 , Pages 585-601 ; 23520124 (ISSN) Sarcheshmehpour, M ; Estekanchi, H. E ; Sharif University of Technology
    Elsevier Ltd  2021
    Abstract
    Past earthquakes revealed that while fulfilling the requirements of the conventional design codes guarantees the life safety of the occupants, considerable economic losses may still be incurred. This highlights the importance of considering life cycle losses in the design procedure of structures. In this research, the significance of the life cycle seismic risk costs in the optimal design of steel framed tube tall buildings is investigated. Typical 20- and 40-story buildings are optimally designed based on three approaches: the code-based, the cost-based, and the fixed weight approach. The first approach only minimizes the initial cost of the building while in the second and third approaches... 

    Endurance time analysis of skewed slab-on-girder bridges: The significance of the excitation angle

    , Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2276-2285 ; 10263098 (ISSN) Estekanchi, H. E ; Ghaffari, E ; Haghani Baei, A ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    In this paper, the influence of the excitation angle on the Endurance Time (TCT) analysis of skewed slab-on-girdcr bridges is studied. The excitation of the structure due to the critical angle produces maximum seismic responses that are sometimes significantly higher than the average. The modeled bridges are of slab-on-girder type that are typically used as highway bridges. The bridge models have skew angles of 0, 15, 30, 45, and CO degrees. The ET excitations exerted on structures cover a broad range of hazard levels. The results provide some insight with regard to choosing multiple excitation angles so as to balance computational costs and retain acceptable accuracy for practical design... 

    Endurance time analysis of skewed slab-on-girder bridges: the significance of the excitation angle

    , Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2276-2285 ; 10263098 (ISSN) Esmailpour Estekanchi, H ; Ghaffari, E ; Haghani Baei, A ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    In this paper, the influence of the excitation angle on the Endurance Time (TCT) analysis of skewed slab-on-girdcr bridges is studied. The excitation of the structure due to the critical angle produces maximum seismic responses that are sometimes significantly higher than the average. The modeled bridges are of slab-on-girder type that are typically used as highway bridges. The bridge models have skew angles of 0, 15, 30, 45, and CO degrees. The ET excitations exerted on structures cover a broad range of hazard levels. The results provide some insight with regard to choosing multiple excitation angles so as to balance computational costs and retain acceptable accuracy for practical design... 

    Performance Evaluation of Grid Scheduling Algorithms Based on Market Theory

    , M.Sc. Thesis Sharif University of Technology Dehlaghi, Alireza (Author) ; Movaghar Rahimabadi, Ali (Supervisor)
    Abstract
    Resource sharing is one of the most interesting features of grid computing. These resources can include CPU, main memory, secondry memory, network bandwith, or data. How to allocate these resources to the tasks remains a complex problem in this domain. The concentration of this thesis is on workflow scheduling. In this case, the works are composed of several tasks, in the way that some tasks have control or data dependency with others. In other words, we have to schedule a DAG (Directed Acyclic Graph) representation of tasks on limited proceccing units. The principle of workflow scheduling optimization is to minimize the makespan, but in the economic scheduling, cost reduction beside... 

    Design and Laboratory Evaluation of Slurry Seal Mixes

    , M.Sc. Thesis Sharif University of Technology Saghafi, Mahdi (Author) ; Tabatabaee, Nader (Supervisor)
    Abstract
    Pavement preventive maintenance methods such as slurry seals are cost-effective treatments that enhance pavement longevity. Incorporation of recycled materials such as reclaimed asphalt pavement (RAP) into asphalt pavements helps further reduce costs and energy consumption. Because the use of emulsions and pavement preventive methods is uncommon in Iran, there is little experience with the technology in this area. The present study designed and developed slurry seal and emulsion test devices at Sharif University lab to study the feasibility of incorporation of RAP into slurry seal mixtures while respecting the limits specified by the ISSA and ASTM. Two slurry seal mixtures in which cement... 

    Probabilistic Model to Forecast Activities Completion Time in Ongoing Mass Housing Projects Case Study: The 10,000-Unit Mass Housing Project Executed by Kayson Company in Venezuela

    , M.Sc. Thesis Sharif University of Technology Baqerin, Mohammad Hassan (Author) ; Shafahi, Yusef (Supervisor) ; Mortaheb, Mohammad Mehdi (Co-Advisor)
    Abstract
    Reliable forecasting is a fundamental element of successful project management. Construction managers regularly control and monitor their project in order to ensure that their project performance is under control and within the acceptable control limits. Conventionally, the earned value method (EVM) is used to monitor project cost performance. However, its application to schedule performance using schedule performance index (SPI) has been widely questioned both by practitioners and researchers particularly due to poor accuracy early in the project. This study presents a novel activity-based framework, namely Weibull Evaluation and Forecasting Method (WEFM), for stochastic evaluation and... 

    Life Cycle Cost Analysis and Comparison Of Concrete Structures with and Without Shear Walls by Endurance Time Method

    , M.Sc. Thesis Sharif University of Technology Eslami Farkoosh, Ehsan (Author) ; Esmaeilpour Estekanchi, Homayun (Supervisor)
    Abstract
    The actual value of structures should not be evaluated only based on initial cost, because failure cost and economical losses due to corrosion and natural hazards can be catastrophic. When a long life Performance of a structure is expected, life cycle cost analysis is the best way to assess and compare economic value of different design choices. The main purpose of this work is investigating the effect of shear walls in limit state cost and total cost . Results demonstrate that shear walls can reduce limit state cost up to 70 percent . Furthermore the influence of increasing thickness of shear walls and effect of reducing dead loads in total life cycle cost is discussed. It is shown that... 

    Optimized Utilization of Electric Vehicles based on Cost Analysis- the point of view of Energy Policy

    , M.Sc. Thesis Sharif University of Technology Mirahmadi, Fereshteh (Author) ; Fotuhi Firouzabad, Mahmud (Supervisor) ; Rajabi Qahnuyeh, Abbas ($item.subfieldsMap.e)
    Abstract
    This thesis represents a comprehensive view of electric vehicles from the macroeconomic policy in the energy sector perspective. In fact, in this thesis all the efficient factors in the presence of electric vehicles in the transport sector have been completely proceed. Environmental, economic, social and political factors, power grids and infrastructure are considered as the impressive factors. In order to check all factors comprehensively, Systems thinking based on dynamic system method is used. The causal relationships between all the variables which are involved in the presence of electric vehicles and related models to this thesis are simulated in VENSIM software. To investigate this... 

    Predictive Control System Design for an Industrial Small Scale Micro Cogeneration System

    , M.Sc. Thesis Sharif University of Technology Hosseini Tash, Mohammad Ali (Author) ; Sayyadi, Hassan (Supervisor)
    Abstract
    Nowadays, due to expansion of the cities, growth in population and developments in technology, energy demand has increased extremely. Therefore responding this increased demand is a great challenge in political and economical management of all countries. Thus in recent years, cogeneration has become so popular between experts in the energy field because of its great efficiency and performance. The goal of this research is to design a controller based on a model which can predict the behavior of the cogeneration system. This controler is called “Mode Based Predictive Controller”. It utilizes the system in such a manner which has the lowest operation costs. This goal is obtained via modeling... 

    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
    Abstract
    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... 

    Interaction of glazing parameters, climatic condition and interior shadings: performing energy and cost analysis in a residential building in Iran

    , Article Energy Efficiency ; Volume 13, Issue 1 , 21 December , 2020 , Pages 159-176 Yousefi, F ; Gholipour, Y ; Saboohi, Y ; Yan, W ; Sharif University of Technology
    Springer  2020
    Abstract
    In this paper, the interaction between various window specifications and different climate conditions is investigated. For this purpose, simultaneous effects of several aspects including glazing system, glass type, filling gas, glass thickness, window frame fraction, and interior shading are considered under three different climatic conditions. To evaluate the energy performance of various considered alternatives, the energy simulation of a base case building is evaluated in a computer environment. Using the validated model, the energy analysis is quantitatively performed, and cost-benefit analyses from the viewpoints of both residents and government are carried out based on the domestic and... 

    Internalizing the social cost of noise pollution in the cost analysis of electricity generated by wind turbines

    , Article Wind Engineering ; Volume 30, Issue 6 , 2006 , Pages 521-529 ; 0309524X (ISSN) Ehyaei, M. A ; Bahadori, M. N ; Sharif University of Technology
    2006
    Abstract
    The Social Cost of nuisance noise from a wind turbine is defined here as the additional cost to reduce the noise level at a receptor to an exceptable, non-nuisance value, i.e. to mitigate this cost. This acceptable sound level is considered to be 35 dB. Our example is a 10-kW (nominal power) wind turbine considered to supply the electrical energy needs of a 3-storey residential building in Tehran and Manjil. The turbine generates sound at 75 dB. To reduce the sound level at the third floor of the building to 35 dB, it was necessary to increase the height of the turbine from 24 m to 48 m. The initial installed cost of the turbine thereby increased from US$45.000 to US$55,000. The cost of... 

    A Bi-objective home health care routing and scheduling model with considering nurse downgrading costs

    , Article International Journal of Environmental Research and Public Health ; Volume 18, Issue 3 , 2021 , Pages 1-24 ; 16617827 (ISSN) Khodabandeh, P ; Kayvanfar, V ; Rafiee, M ; Werner, F ; Sharif University of Technology
    MDPI AG  2021
    Abstract
    In recent years, the management of health systems is a main concern of governments and decision-makers. Home health care is one of the newest methods of providing services to patients in developed societies that can respond to the individual lifestyle of the modern age and the increase of life expectancy. The home health care routing and scheduling problem is a generalized version of the vehicle routing problem, which is extended to a complex problem by adding special features and constraints of health care problems. In this problem, there are multiple stakeholders, such as nurses, for which an increase in their satisfaction level is very important. In this study, a mathematical model is...