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cost-benefit-analysis
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Intelligent tolerance allocation for a high duty brake
, Article 2005 SAE World Congress, Detroit, MI, 11 April 2005 through 14 April 2005 ; 2005 ; 01487191 (ISSN) ; Atharifar, H ; Gholami, M ; Sharif University of Technology
SAE International
2005
Abstract
In this paper, a tolerance allocation approach is proposed which attempts to select tolerances for individual dimensional variables of a product in a way that minimizes the cost while maintaining critical design requirements. The algorithm uses a reciprocal power cost-tolerance function which incorporates variable sensitivities computed in a DLM-based tolerance analysis technique. The process capabilities are applied as constraints and the genetic algorithm is used to find the optimum solution. The method is applied to a heavy duty brake problem and its results are presented. Copyright © 2005 SAE International
An innovative executive and financial mechanism for energy conservation in new and existing buildings in Iran
, Article International Journal of Environmental Science and Technology ; Volume 17, Issue 10 , 2020 , Pages 4217-4232 ; Abbaspour, M ; Soltanieh, M ; Kani, A ; Sharif University of Technology
Springer
2020
Abstract
One of the most effective measures for building energy conservation is the implementation of energy codes. The building energy codes introduction in Iran started two decades after the first oil crisis in the early 1970s by establishing the building energy conservation regulation called Issue 19. Nowadays, due to some financial and executive barriers, the implementation of Issue 19 is faced with some difficulties. The most critical obstacle is the low price of energy carriers, which lead to high subsidies of energy and the reluctance of the building owners to implement the regulation. The main goal of this paper is the introduction of an innovative financial and executive mechanism for...
Cost-Benefit analysis of Iran-Europe Natural gas pipeline in the field of Economics, Environment and Energy Security
, M.Sc. Thesis Sharif University of Technology ; Maleki, Abbas (Supervisor)
Abstract
The intermediary between Consumer and market of Natural gas is long transportation pipeline. Analysis of different dimension is a prerequisite for constructing these infrastructures. This study has been done in the fields of economics, environment and energy security. The proposed pipeline, which is called Islamic pipeline, passes through different countries, Iraq, Syria, Greece and Italy. It carries natural gas and feeds Europe gas requirements, also passes the Mediterranean Sea, which includes underwater pipe-laying technology that has been considered. Economic analysis of this project calculated, using Cost-Benefit analysis. Environmental issues has been identified and classified,...
Reliability Studies of a Smart Distribution System Based on the Concept of Multi-microgrid
, Ph.D. Dissertation Sharif University of Technology ; Fotuhi Firuzabad, Mahmud (Supervisor)
Abstract
Current trend of energy consumption and aging infrastructure of electricity grids mandates high amounts of investment in transmission and distribution networks. On the other hand, with increased awareness about environmental issues, share of renewable energy resources in power generation portfolio has risen in recent years. Microgrids, as one of the most promising solutions to tackle these issues, are able to accommodate high penetration levels of renewable energy sources and distributed generation in distribution systems. However, microgrids sizes are limited due to some operational considerations and as a result, efficient management of distribution systems with high penetration of...
Industrial Symbiosis Analysis between Biogas Plants and Photovoltaic Greenhouses, Using Geographic Information System
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor)
Abstract
Meeting the energy demand of agricultural greenhouses has turned out to be the most important challenge of greenhouse cultivation. In this study, it is proposed to use the concept of industrial symbiosis between agricultural greenhouses and biogas plants to face this challenge. The main purpose of the study is to investigate the potential clean greenhouse area that may be supported by the proposed symbiotic network, in order to provide a decision-making tool for the relevant policymakers. The methodology is based on the agent-based input-output matching economic analysis. The amount of biogas produced by poultry and cattle manure is estimated to be 0.6 (m3 / kg VS) and 0.47 (m3 / kg VS)...
Cost-Benefit Analysis of Greenhouse Gases Emissions Reduction in Iran’s Power Sector for Implementing the Intended Nationally Determined Contribution Under the Paris Agreement
, M.Sc. Thesis Sharif University of Technology ; Maleki, Abbas (Supervisor)
Abstract
The Cost/Benefit Analysis (CBA) is considered to be among the chief and most widely used analytical tools in the realm of public policy and particularly environmental and climatic planning. The National Strategic Plan on Climate Change—a.k.a., Intended Nationally Determined Contribution (INDC) of Iran—under the Paris Agreement (PA) accommodates sets of measures to be undertaken in various sectors of the country, including energy and specifically the power generation sub-sector, so as to reduce the emission of greenhouse gases (GHGs). This study begins with a regression analysis of historical data to identify current trends of fossil fuels consumption, wherefrom the emission level of relevant...
Optimal distribution network automation considering earth fault events
, Article IEEE Transactions on Smart Grid ; Vol. 6, issue. 2 , 2015 , p. 1010-1018 ; ISSN: 19493053 ; Safdarian, A ; Lehtonen, M ; Fotuhi-Firuzabad, M ; Sharif University of Technology
Abstract
In the past decade, distribution network operators have been broadly engrossed toward automated distribution networks. The operators acknowledge network automation as an efficient investment toward a better service reliability. This paper aims to provide a new long-term cost/benefit analysis for an optimal level of distribution network automation. In the analysis, reduction in customer outage cost is considered as the benefit of implementing automation systems with capital investment, and annual operation and maintenance costs. In the Finnish regulation model, there is a special incentive based on customer outage cost reduction. As the main contribution of this paper, the impact of earth...
Optimal PMU placement based on probabilistic cost/benefit analysis
, Article IEEE Transactions on Power Systems ; Vol. 28, issue. 1 , 2013 , p. 566-567 ; ISSN: 8858950 ; Fotuhi-Firuzabad, M ; Safdarian, A ; Sharif University of Technology
Abstract
This letter proposes an analytic framework for achieving an optimal solution for phasor measurement unit (PMU) placement problem. The proposed technique is on the basis of the cost/benefit analysis while long-term economic aspects and existing technical issues are simultaneously accounted for. More deployment of PMU devices would result in more reliable and secure electricity services. The reduction of system risk cost is hence recognized as the benefit associated with the development of wide-area measurement system (WAMS). The optimal number and location of PMUs are determined such that adding more PMUs is no longer beneficial. Two systems are examined to demonstrate the performance of the...
A robust loss function approach for a multi-objective redundancy allocation problem
, Article Applied Mathematical Modelling ; 2015 ; 0307904X (ISSN) ; Ameri, E ; Niaki, S. T .A ; Sharif University of Technology
Elsevier Inc
2015
Abstract
A redundancy allocation problem consists of the selection of a number of redundancies to be allocated in each subsystem of a series-parallel configuration to maximize system reliability, while minimizing overall system cost. Most existing studies either ignore system cost or assume deterministic component reliabilities. However, the selection of a network system design requires the estimation of its reliability and cost. Therefore, the uncertainty associated with such estimates must be considered in the decision process. In this study, an efficient method based on the loss function approach is proposed to solve the redundancy allocation problem. This approach not only optimizes the overall...
A simplified model for the flow inside cascade impactor
, Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) ; Volume 7 A , November , 2013 ; 9780791856314 (ISBN) ; Sohrabi, S ; Falsafi, P ; Gorji, P ; ASME ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2013
Abstract
In this paper we developed a new mathematical model for the flow inside cascade impactors and via this simplified model, we determined the particle size distribution by a fast and low cost computational method. Using cascade impactors for determining the particle size distribution, one can use comprehensive CFD methods to fully simulate the particle traces. Although the results from those CFD analyses can be very accurate, usually that is not a time and cost efficient routine. In contrast, we showed that by using our proposed calculation we can estimate the particle size distribution very fast and yet with the slight error -comparing to the results from CFD method. Cascade impactors are...
Optimal strategies for price, warranty length, and production rate of a new product with learning production cost
, Article Scientia Iranica ; Volume 20, Issue 6 , 2013 , Pages 2247-2258 ; 10263098 (ISSN) ; Niaki, S. T. A ; Sharif University of Technology
Abstract
This study investigates optimal strategies for price, warranty length, and production rate of a new product in which both static markets for non-durable and dynamic markets for durable products are involved. The mathematical model incorporates both the demand and the cost functions including production, warranty length, and inventory costs. Using the maximum principle approach, the optimal strategies and interactions among price, warranty length, and production rate in both markets are analyzed using some propositions. The analysis shows that to maximize profits in all cases, the price, the warranty length, and the production rate all must go up simultaneously, or one of them must increase...
Optimal PMU placement based on probabilistic cost/benefit analysis
, Article IEEE Transactions on Power Systems ; Volume 28, Issue 1 , 2013 , Pages 566-567 ; 08858950 (ISSN) ; Fotuhi-Firuzabad, M ; Safdarian, A ; Sharif University of Technology
2013
Abstract
This letter proposes an analytic framework for achieving an optimal solution for phasor measurement unit (PMU) placement problem. The proposed technique is on the basis of the cost/benefit analysis while long-term economic aspects and existing technical issues are simultaneously accounted for. More deployment of PMU devices would result in more reliable and secure electricity services. The reduction of system risk cost is hence recognized as the benefit associated with the development of wide-area measurement system (WAMS). The optimal number and location of PMUs are determined such that adding more PMUs is no longer beneficial. Two systems are examined to demonstrate the performance of the...
Imperialist competitive algorithm for solving non-convex dynamic economic power dispatch
, Article Energy ; Volume 44, Issue 1 , 2012 , Pages 228-240 ; 03605442 (ISSN) ; Rabiee, A ; Soroudi, A ; Ehsan, M ; Sharif University of Technology
Abstract
Dynamic economic dispatch (DED) aims to schedule the committed generating units' output active power economically over a certain period of time, satisfying operating constraints and load demand in each interval. Valve-point effect, the ramp rate limits, prohibited operation zones (POZs), and transmission losses make the DED a complicated, non-linear constrained problem. Hence, in this paper, imperialist competitive algorithm (ICA) is proposed to solve such complicated problem. The feasibility of the proposed method is validated on five and ten units test system for a 24 h time interval. The results obtained by the ICA are compared with other techniques of the literature. These results...
A hybrid ant colony, Markov chain, and experimental design approach for statistically constrained economic design of MEWMA control charts
, Article Expert Systems with Applications ; Volume 39, Issue 3 , February , 2012 , Pages 3265-3275 ; 09574174 (ISSN) ; Ershadi, M. J ; Sharif University of Technology
2012
Abstract
The multivariate exponentially weighted moving average, MEWMA, control chart is an effective statistical tool for detecting small shifts in process mean vectors. On the one hand, the economic design process of a MEWMA control chart involves determining the main parameters of the chart, namely, the sample size n, the sampling interval h, the smoothing constant r, and the control limit L such that a quality cost function is minimized. On the other hand, the statistically constrained economic design of MEWMA chart is to determine the chart parameters such that a cost function is minimized while the statistical performance of the chart is maintained at a desire level. In this paper, the...
A particle swarm optimization approach on economic and economic-statistical designs of MEWMA control charts
, Article Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1529-1536 ; 10263098 (ISSN) ; Malaki, M ; Ershadi, M. J ; Sharif University of Technology
2011
Abstract
Control charts are the best tools to monitor main process parameters, and the Multivariate Exponentially Weighted Moving Average, MEWMA, type of this tool is used when there are several correlated quality characteristics to be monitored simultaneously where detecting small deviations of the characteristics is desired. In this paper, the models of both the economic and the economic-statistical design problems of MEWMA control charts are solved by a Particle Swarm Optimization (PSO) approach. The comparison study between the economic and the economic-statistical designs shows better statistical performances of the economic-statistical design with negligible increase in cost. Furthermore, in...
Two-dimensional warranty cost analysis for second-hand products
, Article Communications in Statistics - Theory and Methods ; Volume 40, Issue 4 , 2011 , Pages 684-701 ; 03610926 (ISSN) ; Chukova, S ; Saidi-Mehrabad, M ; Niaki, S. T. A ; Sharif University of Technology
2011
Abstract
In spite of the recent steady increase of the volume of the second-hand markets, often customers remain in doubt regarding the quality and durability of the secondhand products. Aiming to reduce and share this uncertainty, dealers offer warranty on their products. Offering warranty for second-hand products is a relatively new marketing strategy employed by dealers of used electronic equipment, furniture, automobiles, etc. Usually, for used products, the dealer's expected warranty cost is a function of product reliability, past age and usage, servicing strategy and conditions and terms of the warranty policy/contract. Sometimes the offered policy is limited by two parameters, typically the...
Making HeNB more secure with improved secure access protocol and analyzing it
, Article Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, 16 September 2015 through 18 September 2015 ; Volume 158 , 2015 , Pages 107-120 ; 18678211 (ISSN) ; 9783319269245 (ISBN) ; Payandeh, A ; Habibi, H ; Sharif University of Technology
Springer Verlag
2015
Abstract
The 3rd Generation Partnership Project (3GPP) defined a new architecture, called Home eNode B (HeNB). HeNB is able to provide new services with higher data rate in a low cost. Security is a critical aspect of HeNB. In order to have HeNB secure access to core network, 3GPP defines an authentication protocol based on IKEv2. A number of security vulnerabilities such as HeNB masquerading have not been addressed and solved by 3GPP technical specification yet. In this paper an improved HeNB authentication protocol is introduced which does not allow an attacker to connect unauthorized network users using a mask. Finally, we evaluate our protocol performance and verify it by Automated Validation of...
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) ; 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...
A robust loss function approach for a multi-objective redundancy allocation problem
, Article Applied Mathematical Modelling ; Volume 40, Issue 1 , 2016 , Pages 635-645 ; 0307904X (ISSN) ; Ameri, E ; Akhavan Niak, S. T ; Sharif University of Technology
Elsevier Inc
2016
Abstract
A redundancy allocation problem consists of the selection of a number of redundancies to be allocated in each subsystem of a series-parallel configuration to maximize system reliability, while minimizing overall system cost. Most existing studies either ignore system cost or assume deterministic component reliabilities. However, the selection of a network system design requires the estimation of its reliability and cost. Therefore, the uncertainty associated with such estimates must be considered in the decision process. In this study, an efficient method based on the loss function approach is proposed to solve the redundancy allocation problem. This approach not only optimizes the overall...
Multi-objective optimization for design and operation of distributed energy systems through the multi-energy hub network approach
, Article Industrial and Engineering Chemistry Research ; Volume 55, Issue 33 , 2016 , Pages 8950-8966 ; 08885885 (ISSN) ; Sattari, S ; Roshandel, R ; Fowler, M ; Elkamel, A ; Sharif University of Technology
American Chemical Society
2016
Abstract
A generic framework is developed to study the application of energy hubs and its related network model to demonstrate the optimal design and operation of distributed energy systems (DESs) in urban areas. A novel multi-objective approach based on augmented epsilon constraint technique is employed to carry out this work. As an illustrative example, the proposed model is applied to an urban area in Ontario, Canada. Different scenarios are defined to investigate the effect of energy storage systems and energy exchange within a network on the optimal configuration and operation of the system. Moreover, multi-objective optimization is carried out based on two conflicting objectives, namely, total...