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A system dynamics approach to analyze water resources systems
, Article 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges, 11 September 2005 through 16 September 2005 ; 2005 , Pages 4991-5000 ; 8987898245 (ISBN); 9788987898247 (ISBN) ; Baradarannia, M.R ; Sarang, A ; Hjorth, P ; Byong-Ho J ; Sang I.L ; Won S.I ; Gye-Woon C ; Sharif University of Technology
Korea Water Resources Association
2005
Abstract
Several mathematical modeling approaches are used to model water resources systems such as deterministic and non-deterministic, lumped and distributed, steady and dynamic, simulation and optimization approaches. All these modeling paradigms - categorized as open systems - assume that the input conditions to the system will not change during their operation. What is happening in the real world is somewhat different. Due to their dynamic behaviors, real world events exert feedbacks from their outputs to their inputs which may cause the input conditions vary with time. This is the main focus of the system dynamics theory which has been introduced in this paper to be applied in water resources...
Resource investment problem with discounted cash flows
, Article International Journal of Engineering, Transactions B: Applications ; Volume 18, Issue 1 , 2005 , Pages 53-64 ; 1728-144X (ISSN) ; Akhavan Niaki, S. T ; Sharif University of Technology
Materials and Energy Research Center
2005
Abstract
A resource investment problem is a project-scheduling problem in which the availability levels of the resources are considered as decision variables and the goal is to find a schedule, and resource requirement levels, such that some objective function optimizes. In this paper, we consider a resource investment problem in which the goal is to maximize the net present value of the project cash flows. We call this problem as Resource Investment Problem with Discounted Cash Flows (RIPDCF) and we develop a heuristic method to solve it. Results of several numerical examples show that the proposed method performs relatively well
Fuzzy simple additive weighting method by preference ratio
, Article Intelligent Automation and Soft Computing ; Volume 11, Issue 4 , 2005 , Pages 235-244 ; 10798587 (ISSN) ; Sadi Nezhad, S ; Sharif University of Technology
2005
Abstract
Although simple additive weighting method (SAW) is the most popular approach for classical multiple attribute decision making (MADM), it is not practical any more if information is fuzzy. The existing methods of Fuzzy Simple Additive Weighting method (FSAW) apply defuzzification which distorts fuzzy numbers. Furthermore, most of the methods usually require lengthy and laborious manipulations. In this paper, we develop a new a fuzzy simple additive weighting method for multiple attribute decision making problems. To avoid defuzzification round off errors caused by multiplication or other arithmetic manipulations, fuzzy numbers are ranked prior to any fuzzy arithmetic in this method. The...
Generation expansion planning of stand-alone micro-power systems using MADM techniques
, Article 42nd International Universities Power Engineering Conference, UPEC 2007, Brighton, 4 September 2007 through 6 September 2007 ; 2007 , Pages 68-72 ; 1905593368 (ISBN); 9781905593361 (ISBN) ; Afsharnia, S ; Ehsan, M ; Kamalinia, S ; Sedighizadeh, M ; Sharif University of Technology
2007
Abstract
In this paper, Analytic Hierarchy Process and Data Envelopment Analysis are introduced as multi attribute decision making techniques in planning of standalone micro-power systems. The objective of the planning framework is to select the best configuration and capacity of different generating technologies in micro-power systems to minimize certain economical and environmental attributes. The economical attributes are capital cost and net present cost and the environmental attribute is emission. The proposed framework is illustrated by a case study on a real network in northern region of Iran
Emerging simple emotional states in Zamin artificial world
, Article Intelligent Automation and Control Trends, Principles, and Applications - International Symposium on Intelligent Automation and Control, ISIAC - Sixth Biannual World Automation Congress, WAC 2004, Seville, 28 June 2004 through 1 July 2004 ; 2004 , Pages 43-48 ; 1889335223 (ISBN) ; Halavati, R ; Shouraki, S. B ; Lucas, C ; Sharif University of Technology
2004
Abstract
Zamin, is an Artificial Life ecosystem, suitable for cognitive studies such as evaluation of different thinking and acting methods. Up to now, simple models for decision making, generalization and abstraction, environment perception and pleasure computation is developed and tested in Zamin. In this paper, we have promoted the two layered decision-making system of Zamin creatures, the Aryos, to a three layered emotional decision making mechanism, compared the learning and coping with predators capabilities of the new creatures with the old ones and shown that they can defeat the previous, emotion-less creatures
Modeling pedestrian's decision at street crossing
, Article Traffic and Transportation Studies - Proceedings of the Fourth International Conference on Traffic and Transportation Studies, Dalian, 2 August 2004 through 4 August 2004 ; Volume 4 , 2004 , Pages 127-137 ; 7030137809 (ISBN) ; Amooghin, Y. S ; Sharif University of Technology
2004
Abstract
Safe and efficient pedestrian movement is an important issue of concern in traffic engineering. Evaluation and identification of effective parameters in pedestrians' decision-making process when crossing a street can be beneficial in improving their safety. In this report, two streets in Tehran, Iran were selected to study the pedestrians' crossing. The data from the video films at these locations were used to fit the logit and nested logit models. The results indicate that factors such as arrival time of first nearside vehicle to crosswalk, headway between first and second vehicle approaching the crosswalk, vehicles platoon size and their approaching speed in each lane, pedestrians' age,...
Bandwidth optimization of the E-shaped microstrip antenna using the genetic algorithm based on fuzzy decision making
, Article IEEE Antennas and Propagation Society Symposium 2004 Digest held in Conjunction with: USNC/URSI National Radio Science Meeting, Monterey, CA, 20 June 2004 through 25 June 2004 ; Volume 3 , 2004 , Pages 2333-2336 ; 02724693 (ISSN) ; Kashani, F. H ; Barkeshli, K ; Sharif University of Technology
2004
Abstract
The bandwidth of the E-shaped microstrip antenna is optimized using the genetic algorithm (GA) based on fuzzy decision-making, The method of moments is employed for the analysis of the microstrip antenna at the frequency band of 1.8GHz to 2.6GHz by the optimization parameters of supply locations and slot dimensions. Fuzzy inference system is used for the control of the parameters of the genetic algorithm. In the implemented fuzzy system, inputs are parameters like population, and outputs are parameters such as crossover and mutation rates. Simulation results show the genetic algorithm to optimize the bandwidth of the E-shaped microstrip patch by 33.3%. The measured results of the optimized...
Axial offset control of PWR nuclear reactor core using intelligent techniques
, Article Nuclear Engineering and Design ; Volume 227, Issue 3 , 2004 , Pages 285-300 ; 00295493 (ISSN) ; Ghofrani, M. B ; Lucas, C ; Yazdanpanah, M. J ; Sadati, N ; Sharif University of Technology
2004
Abstract
Improved load following capability is one of the main technical performances of advanced PWR (APWR). Controlling the nuclear reactor core during load following operation encounters some difficulties. These difficulties mainly arise from nuclear reactor core limitations in local power peaking, while the core is subject to large and sharp variation of local power density during transients. Axial offset (AO) is the parameter usually used to represent of core power peaking, in form of a practical parameter. This paper, proposes a new intelligent approach to AO control of PWR nuclear reactors core during load following operation. This method uses a neural network model of the core to predict the...
Performance comparison of admission control policies for new calls in soft-handoff regions for CDMA cellular networks
, Article Scientia Iranica ; Volume 11, Issue 3 , 2004 , Pages 193-202 ; 10263098 (ISSN) ; Aref, M. R ; Salehi, J. A ; Sharif University of Technology
Sharif University of Technology
2004
Abstract
In this paper, two basic new call admission control policies in soft-handoff regions in Code-Division Multiple-Access (CDMA) cellular networks are compared. The two policies are Independent Decision Policy (IDP), which is, approximately, equivalent to a directed retry policy proposed for non-CDMA cellular networks and Collective Decision Policy (CDP). The merits in this comparison include the tradeoff between carried traffic and quality loss probability while maintaining other traffic parameters (such as blocking and dropping (handoff failure) probabilities) sufficiently low. Using numerical results, it is deduced that the CDP leads to a better overall performance. Another important issue...
Optimal planning of equipment maintenance and replacement on a variable horizon
, Article Scientia Iranica ; Volume 11, Issue 3 , 2004 , Pages 185-192 ; 10263098 (ISSN) ; Sharif University of Technology
Sharif University of Technology
2004
Abstract
In maintenance and replacement planning of an industry, the purchasing of new equipment on the market with some kind of technological improvement over existing equipment should be taken into account. Because of operating cost, ordinary and preventive maintenance expenses may be lower, production rate may be higher and the quality of output may be better, etc. The industry to be considered in this paper is the mining industry and the replaced equipment is the mine shovel. It is assumed that, at most, one new shovel can be purchased before the mine is exhausted. It is possible that the mine is given up before exhausted, because of the disadvantage of the expense and loss of the salvage value...
Ranking fuzzy numbers by preference ratio
, Article Fuzzy Sets and Systems, Amsterdam ; Volume 118, Issue 3 , 2001 , Pages 429-436 ; 01650114 (ISSN) ; Sadi Nezhad, S ; Sharif University of Technology
Elsevier Science Publishers B.V
2001
Abstract
We propose a ranking method for fuzzy numbers. In this method a preference function is defined by which fuzzy numbers are measured point by point and at each point the most preferred number is identified. Then, these numbers are ranked on the basis of their preference ratio. Therefore, fuzzy numbers are compared relatively and not necessarily one is preferred absolutely over the others. This method is especially designed to evaluate alternatives in multi criteria or multi-attribute decision making. The method is intuitive and can be used to discriminate between numbers easily. The method is specially tailored for triangular fuzzy numbers (TFN) and an algorithm is presented to determine the...
Middle sized soccer robots: ARVAND
, Article 3rd Robot World Cup Soccer Games and Conferences, RoboCup 1999, 27 July 1999 through 6 August 1999 ; Volume 1856 , 2000 , Pages 61-73 ; 03029743 (ISSN); 9783540410430 (ISBN) ; Foroughnassiraei, A ; Chiniforooshan, E ; Ghorbani, R ; Kazemi, M ; Chitsaz, H ; Mobasser, F ; Sadjad, S. B ; Sony Corporation ; Sharif University of Technology
Springer Verlag
2000
Abstract
Arvand is the name of robots specially designed and con-structed by sharif CE team for playing soccer according to RoboCup rules and regulations for the middle size robots. Two different types of robots are made, players and the goal keeper. A player robot consists of three main parts: mechanics (motion mechanism and kicker), hard-ware (image acquisition, processing unit and control unit) and software (image processing, wireless communication, motion control and decision making). The motion mechanism is based on two drive unit, two steer units and a castor wheel. We designed a special control board which uses two microcontrollers to carry out the software system decisions and transfers them...
Comparison of statistical and MCDM approaches for flood susceptibility mapping in northern Iran
, Article Journal of Hydrology ; Volume 612 , 2022 ; 00221694 (ISSN) ; Ataie Ashtiani, B ; Hosseini, S. M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Accurate mapping of flood risk areas is the basis for providing basic information on flood hazard reduction strategies and facilitates the relocation process. This study compared statistical approaches and multi-criteria-decision-making (MCDM) in flood hazard susceptibility mapping (FHSM). The performance of two statistical methods, the Evidential Belief Function (EBF) and Weight of Evidence (WOE), was compared with the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) as an MCDM technique. Mohammad-Abad catchment, known as one of the flood susceptible areas in northern Iran, was selected as a case study. A 100-year flood event with a peak flow of 85 m3/s, known as...
A novel hybrid systemic modeling into sustainable dynamic urban water metabolism management: Case study
, Article Sustainable Cities and Society ; Volume 85 , 2022 ; 22106707 (ISSN) ; Zarghami, M ; Tizghadam, M ; Abbasi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Over the past few years, due to increasing population, limited water resources, and other pressures on the urban water systems (UWS), urban water management has become a major concern for urban policymakers to develop efficient management solutions. In this study, a new hybrid model called sustainable dynamic urban water metabolism management (SDUWMM) is presented, based on urban water metabolism and system dynamics. Isfahan's UWS has been modeled by SDUWMM and its conditions have been simulated until 2041. SDUWMM considers effective internal relationships of the UWS components such as population, climate change, water supply and demand, infrastructures condition, water price, costs and...
A novel decision-making methodology for materials selection under uncertainty: modified fuzzy logic method
, Article Soft Computing ; Volume 26, Issue 22 , 2022 , Pages 12093-12114 ; 14327643 (ISSN) ; Abedian, A ; Razaghian, P ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
In this research work, a modified fuzzy approach referred to as modified fuzzy logic method (MFLM) is proposed to more conveniently solve intricate decision-making problems under uncertainty and data deficiency. The method resolves major drawbacks like inaccuracy, complexity, and a high volume of computational efforts with the existing approaches for the mentioned problems. Here, MFLM is applied to materials selection for a cryogenic storage tank and a gas turbine blade, which are standard engineering problems used for verification by researchers, and the ranking results are compared with the state-of-the-art techniques in the literature, such as the conventional fuzzy logic method....
Prioritizing strategic innovative energy technologies for development by a novel fuzzy approach based on distances from ideals (Case study: Upstream technologies of Iran's oil industry fields)
, Article Energy Reports ; Volume 8 , 2022 , Pages 362-376 ; 23524847 (ISSN) ; Maleki, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Previous empirical research about the functions of innovative systems has been less enabled to present practical strategies for managers’ decisions. This paper aims to determine the boundaries of the innovation system in the oil industry by prioritizing strategic innovative upstream technologies for policy-making and commercializing within the framework of energy technological innovation systems. This paper proposes a novel fuzzy approach based on distance from ideals to scrutinize the effects of effective criteria on the policy-making process and rank new and essential technologies in various fields. The developed fuzzy Technique for Order of Preference by Similarity to Ideal Solution...
A discrete differential evolution with local search particle swarm optimization to direct angle and aperture optimization in IMRT treatment planning problem
, Article Applied Soft Computing ; Volume 131 , 2022 ; 15684946 (ISSN) ; Mahnam, M ; Akhavan Niaki, S. T ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Intensity-modulated radiation therapy is a well-known technique for treating cancer patients worldwide. A treatment plan in this technique requires decision-making for three main problems: selection of beam angles, intensity map calculation, and leaf sequencing. Previous works investigated these problems sequentially. We present a new integrated framework for simultaneous decision-making of directions, intensities, and aperture shape, called direct angle and aperture optimization, and develop a mixed-integer nonlinear mathematical model for the problem. Due to the nonlinearity and the dimension of the problem, three efficient metaheuristics based on differential evolution (DE) called classic...
Integrated analysis of energy-pollution-health nexus for sustainable energy planning
, Article Journal of Cleaner Production ; Volume 356 , 2022 ; 09596526 (ISSN) ; Alizadeh, S ; Avami, A ; Kianbakhsh, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
In recent years, the emission of various pollutants has caused many problems for human life and the ecosystem. The prioritization between different air pollution control scenarios is a challenge between scientists and policy-makers. This study develops an integrated method for sustainable energy planning considering the energy-pollution-health nexus. The paper investigates three main pollutants (i.e., PM2.5, SO2, and NOx) of different emission sources (i.e., industrial, residential, and intra-city and suburban transportations) in twelve scenarios. The American Meteorological Society/Environmental Protection Agency Regulatory Model (AERMOD) is applied to model the air pollution dispersion,...
A resilience-based practical platform and novel index for rapid evaluation of urban water distribution network using hybrid simulation
, Article Sustainable Cities and Society ; Volume 82 , 2022 ; 22106707 (ISSN) ; Mortaheb, M. M ; Hassani, N ; Taghizadeh yazdi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
This article proposes a novel index along with a user-friendly platform for resilience evaluation of the urban water distribution networks (WDN). WDN is of great importance in preserving the safety and sustainability of communities and cities. Resilience of a given system results in its sustainability. In recent years, many studies have focused on resilient urban WDN. However, these studies did not provide a comprehensive evaluation index and platform that could simultaneously consider hydraulic analysis, resilience parameters, and significant uncertainties. In this study, a novel resilience index was defined, and a user-friendly and practical platform (REWAT) was developed to calculate the...
A computational approach to homans social exchange theory
, Article Physica A: Statistical Mechanics and its Applications ; Volume 597 , 2022 ; 03784371 (ISSN) ; Mehrani Ardebili, M ; Reyhani Kivi, R ; Amjadi, B ; Jamali, Y ; Sharif University of Technology
Elsevier B.V
2022
Abstract
How does society work? How do groups emerge within society? What are the effects of emotions and memory on our everyday actions? George Homans, like us, had a perspective on what society is, except that he was a sociologist. Homans theory, which is an exchange theory, is based on a few propositions about the fundamental actions of individuals, and how values, memory, and expectations affect their behavior. In this paper, as Homans predicted, our main interest and purpose are to find out whether these propositions lead to the emergence of groups. To do so, computationally, Based on Homans’ prepositions, we provide the opportunity for each agent to exchange with other agents. That is, each...