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    Incorporating large-scale distant wind farms in probabilistic transmission expansion planning-part II: Case studies

    , Article IEEE Transactions on Power Systems ; Vol. 27, issue. 3 , 2012 , p. 1594-1601 ; ISSN: 08858950 Moeini-Aghtaie, M ; Abbaspour, A ; Fotuhi-Firuzabad, M ; Sharif University of Technology
    Abstract
    This paper is the second part of a two-paper set which comprehensively sets forth an innovative approach in transmission grid reinforcement studies in the presence of wind energy. Part I thoroughly defined the theory and algorithms. Here, to trace the feasibility of the proposed algorithm, three different case studies are implemented on the 24-Bus IEEE Reliability Test System (IEEE-RTS). The optimal solutions in Pareto fronts of different cases are reached, analyzed, and the final solution (optimal plan) of each case is obtained using the fuzzy decision making method. Moreover, in order to analyze the effects of variations in the large-scale wind farm generation on the transmission expansion... 

    Performance Optimization of Cu Wires for Network-on-chip Based Many-core Architectures

    , M.Sc. Thesis Sharif University of Technology Radfar, Farzad (Author) ; Sarvari, Reza (Supervisor)
    Abstract
    The exponential increase in power density within a chip due to higher frequency of operation in recent years (Moor's law) is a major limiting factor for designers. Increasing the number of parallel cores instead of increasing the frequency of operation is a possible solution. The design of connections within the cores can be followed by the old process but the global interconnectsbetween the cores instead of point to point can be replaced byNetwork-on-Chip (NoC). In this thesis, The dimensions of global interconnects in many-core chips are optimized for maximum bandwidth density and minimum delay taking into account network-on-chip router latency and size effects of coppe. The optimal... 

    Hedonic Analysis of Land Price Case Study in Tehran, Zone 8

    , M.Sc. Thesis Sharif University of Technology Saharkhiz, Morteza (Author) ; Fatemi, Farshad (Supervisor) ; Barakchian, Mahdi (Supervisor)
    Abstract
    The land market is one of the most important markets in the economy. Land is a factor of production, store of value, and a major part of household’s portfolio. Although price of land is an essential information for institutions like municipalities whom tax the landlords, or for financial intermediaries like banks whom use the land as collateral, studies about price of land and its spatial and time variations are scrace in Iran. Furthermore, most of studies in other countries are usually based on inflexible OLS estimators. Thus, this study has two main contributions. First, to analyze the usefulness of hedonic modeling in explaining the price of land, utilizing a unique dataset for Tehran... 

    Optimum hello interval for a connected homogeneous topology in mobile wireless sensor networks

    , Article Telecommunication Systems ; Vol. 52, issue. 4 , April , 2013 , pp. 2475-2488 ; Online ISSN: 1572-9451 Nayebi, A ; Sarbazi-Azad, H ; Sharif University of Technology
    Abstract
    Topology of a mobile wireless sensor/ad hoc network is prone to link breakages due to node mobility which compels the periodic re-construction of the topology in so called ""hello"" intervals. The problem addressed in this paper is determining the maximum ""hello"" interval preserving the connectivity of a homogeneous topology with high probability. In order to study the optimum ""hello"" interval, statistical topology lifetime (STL) is formally defined as a value of ""hello"" interval that ensures statistical connectivity with a given threshold. Temporal properties of the topology are studied based on two phenomena; one concerning a connectivity phase transition with time and the other one... 

    The design of an estimation model for environmental liability insurance (ELIS)

    , Article International Journal of Environmental Research ; Vol. 8, Issue. 1 , 2014 , Pages 193-204 ; ISSN: 17356865 MirzaEbrahim Tehrani, M ; Abbaspour, M ; Nouri, J ; Mazloomi, N ; Sharif University of Technology
    Abstract
    Pricing for an insurance policy can be described as the process of calculation of expected compensation to be paid to property losers as well as associated costs of potential risks. Loss forecast is accurate if the risks will be identified appropriately in order to calculate the frequency and expected severity of losses.This is particularly important about environmental risks since most of them appear in the long run. Environmental risk assessment model is both able to estimate the environmental liability premium for environmental pollution and degradation, and it can play a valuable role in promoting this industry. ELIS (Environmental Liability Insurance) software calculates the... 

    Private Investor-based Transmission Expansion Planning in Deregulated Environments

    , Article Electric Power Components and Systems ; Volume 43, Issue 6 , 2015 , Pages 620-632 ; 15325008 (ISSN) Arabali, A ; Hosseini, S. H ; Moeini Aghtaie, M ; Sharif University of Technology
    Taylor and Francis Inc  2015
    Abstract
    Deregulation in power systems creates new uncertainties and escalates the previous ones. The presence of these uncertainties causes the transmission network to remain a monopoly and the private investors not to be interested in investing in new transmission lines. This article presents a new merchant-based transmission network expansion planning algorithm from the viewpoint of private investors. The point estimation method is used to handle the uncertainties, and the genetic algorithm is used as the optimization tool. The proposed method provides insights for private investors to deal with the uncertainties and to find appropriate transmission projects in which to invest. Copyright  

    Adaptive and non-adaptive ISI sparse channel estimation based on SL0 and its application in ML sequence-by-sequence equalization

    , Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 27 September 2010 through 30 September 2010 ; Volume 6365 LNCS , September , 2010 , Pages 579-587 ; 03029743 (ISSN) ; 9783642159947 (ISBN) Niazadeh, R ; Hamidi Ghalehjegh, S ; Babaie Zadeh, M ; Jutten, C ; Sharif University of Technology
    2010
    Abstract
    In this paper, we firstly propose an adaptive method based on the idea of Least Mean Square (LMS) algorithm and the concept of smoothed l 0 (SL0) norm presented in [1] for estimation of sparse Inter Symbol Interface (ISI) channels which will appear in wireless and acoustic underwater transmissions. Afterwards, a new non-adaptive fast channel estimation method based on SL0 sparse signal representation is proposed. ISI channel estimation will have a direct effect on the performance of the ISI equalizer at the receiver. So, in this paper we investigate this effect in the case of optimal Maximum Likelihood Sequence-by-sequence Equalizer (MLSE) [2]. In order to implement this equalizer, we... 

    Experimental investigation of clear-water local scour of compound piers

    , Article Journal of Hydraulic Engineering ; Volume 136, Issue 6 , June , 2010 , Pages 343-351 ; 07339429 (ISSN) Ataie Ashtiani, B ; Baratian Ghorghi, Z ; Beheshti, A. A ; Sharif University of Technology
    2010
    Abstract
    Local scour around complex piers under steady clear-water condition was studied experimentally for a variety of configuration, including different sizes and shapes of complex piers. A total of 70 experiments were carried out. Three sets of experiments were performed over the entire range of possible pile cap elevations for complex piers with different geometrical characteristics. The collected data are used to quantify the pile cap elevations that maximize or minimize the local scour depth. Some of the available methodologies to estimate the maximum local scour depth around such complex piers are evaluated. The predictions of the scour depths improved by using the revised methods of... 

    Constants of explosive limits

    , Article Chemical Engineering Science ; Volume 173 , 2017 , Pages 384-389 ; 00092509 (ISSN) Nassimi, A. M ; Jafari, M ; Farrokhpour, H ; Keshavarz, M. H ; Sharif University of Technology
    Elsevier Ltd  2017
    Abstract
    This work defines density factor as the ratio of before ignition density to after ignition density of the ignition mixture. This work provides an estimation method for explosive limits of various fuels under room temperature and pressure by showing that for a large universe of fuels, constant adiabatic flame temperature and density factor are appropriate approximations at the lower explosive limit while only a constant density factor might be an appropriate approximation at the upper explosive limit. Thus the assumption of a constant adiabatic flame temperature can be used in calculating lower explosive limit while the assumption of a constant density factor can be used in approximating... 

    The emergence of Iran in the world car industry: An estimation of its export potential

    , Article World Economy ; Volume 32, Issue 5 , 2009 , Pages 790-818 ; 03785920 (ISSN) Abedini, J ; Péridy, N ; Sharif University of Technology
    2009
    Abstract
    In the past 10 years Iran has been emerging as a major car producer in the world. However, due to delays in economic reforms, Iranian car exports have not increased as much as production. This paper presents a first estimation of the Iranian export potential in the car industry. Based on new theoretical developments of the gravity equation, an empirical bilateral trade model is proposed. It includes sectoral variables (car production, import tariffs), as well as other original variables, such as expectations and hysteresis. We then develop a dataset which includes the 40 major car-exporting countries in the world, 34 importing countries, a 10-year time period as well as four car production... 

    Searching for the finance–growth nexus in Libya

    , Article Empirical Economics ; Volume 58, Issue 2 , 2020 , Pages 567-581 Cevik, S ; Rahmati, M. H ; Sharif University of Technology
    Springer  2020
    Abstract
    This paper investigates the causal relationship between financial development and economic growth in Libya during the period 1970–2016, providing new insights from a resource-dependent economy. The empirical results vary with estimation methodology and model specification, but indicate no long-run relationship between financial intermediation and nonhydrocarbon output growth. The OLS estimation shows that financial development has a statistically significant negative effect on real nonhydrocarbon GDP per capita growth. However, both the VAR- and ARDL-based estimations present statistically insignificant results, albeit still attaching a negative coefficient to financial intermediation. It... 

    Estimating parameters of the three-parameter Weibull distribution using a neural network

    , Article European Journal of Industrial Engineering ; Volume 2, Issue 4 , 2008 , Pages 428-445 ; 17515254 (ISSN) Abbasi, B ; Rabelo, L ; Hosseinkouchack, M ; Sharif University of Technology
    Inderscience Publishers  2008
    Abstract
    Weibull distributions play an important role in reliability studies and have many applications in engineering. It normally appears in the statistical scripts as having two parameters, making it easy to estimate its parameters. However, once you go beyond the two parameter distribution, things become complicated. For example, estimating the parameters of a three-parameter Weibull distribution has historically been a complicated and sometimes contentious line of research since classical estimation procedures such as Maximum Likelihood Estimation (MLE) have become almost too complicated to implement. In this paper, we will discuss an approach that takes advantage of Artificial Neural Networks... 

    Probabilistic optimal power flow in correlated hybrid wind-photovoltaic power systems

    , Article IEEE Transactions on Smart Grid ; Vol. 5, issue. 1 , 2014 , p. 130-138 ; ISSN: 19493053 Aien, M ; Fotuhi-Firuzabad, M ; Rashidinejad, M ; Sharif University of Technology
    Abstract
    As a matter of course, the unprecedented ascending penetration of distributed energy resources (DERs), mainly harvesting renewable energies (REs), is concomitant with environmentally friendly concerns. This type of energy resources are innately uncertain and bring about more uncertainties in the power system, consequently, necessitates probabilistic analyses of the system performance. Moreover, the uncertain parameters may have a considerable level of correlation to each other, in addition to their uncertainties. The two point estimation method (2PEM) is recognized as an appropriate probabilistic method in small scale or even medium scale problems. This paper develops a new methodology for... 

    Incorporating large-scale distant wind farms in probabilistic transmission expansion planning-part I: Theory and algorithm

    , Article IEEE Transactions on Power Systems ; Vol. 27, issue. 3 , 2012 , p. 1585-1593 ; ISSN: 08858950 Moeini-Aghtaie, M ; Abbaspour, A ; Fotuhi-Firuzabad, M ; Sharif University of Technology
    Abstract
    With increment in the penetration of wind energy in power systems, the necessity of considering its impacts on transmission expansion planning (TEP) studies, especially for large scale wind farms, is inevitable. A new multi-objective (MO) optimization transmission expansion planning algorithm considering wind farm generation is presented in this two-paper set. Part I is mainly devoted to derivation of the theory and algorithm. The objective functions used in the TEP studies take into account investment cost, risk cost and congestion cost. The combination of Monte Carlo simulation (MCS) and Point Estimation Method (PEM) is implemented to investigate the effects of network uncertainties. Due... 

    Identification and Abnormal Condition Detection of a Cement Rotary Kiln

    , M.Sc. Thesis Sharif University of Technology Sadeghian, Masoud (Author) ; Fatehi, Alireza (Supervisor)
    Abstract
    One of the most important parts of a cement factory is the cement rotary kiln which plays a key role in quality and quantity of produced cement. In this part, the physical exertion and bilateral movement of air and materials, together with chemical reactions take place. Thus, this system has immensely complex and nonlinear dynamic equations. These equations have not worked out yet. Only in exceptional case; however, a large number of the involved parameters were crossed out and an approximation model was presented instead. This issue caused many problems for designing a cement rotary kiln controller. In this thesis, we employed a nonlinear system identification method for identification,... 

    Probabilistic power flow of correlated hybrid wind-photovoltaic power systems

    , Article IET Renewable Power Generation ; Vol. 8, issue. 6 , 2014 , p. 649-658 ; ISSN: 17521416 Aien, M ; Khajeh, M. G ; Rashidinejad, M ; Fotuhi-Firuzabad, M ; Sharif University of Technology
    Abstract
    As a matter of course, the unprecedented ascending penetration of distributed energy resources, mainly harvesting renewable energies such as wind and solar, is concomitant with environmentally friendly concerns. This type of energy resources are innately uncertain and bring about more uncertainties in the power system context, consequently, necessitates probabilistic analysis of the system performance. Moreover, the uncertain parameters may have a considerable level of correlation to each other, in addition to their uncertainties. The two point estimation method (2PEM) is recognised as an appropriate probabilistic method. This study proposes a new methodology for probabilistic power flow... 

    Resource allocation using fragmented-spectrum synchronous OFDM-CDMA in cognitive radio networks

    , Article IWCIT 2014 - Iran Workshop on Communication and Information Theory ; May , 2014 ; ISBN: 9781479948772 Akhoondi, F ; Poursaeed, O ; Salehi, J. A ; Sharif University of Technology
    Abstract
    This paper presents a fragmented-spectrum synchronous OFDM-CDMA modulation and utilize it as secondary users modulation in a cognitive radio-based network to provide high data rate by efficiently exploiting available spectrum bands in a target spectral range while simultaneously offering multiple-access capability. In particular, given preexisting communications in the spectrum where the system is operating, a channel sensing and estimation method is used to obtain information of subcarrier availability. Given this information, some three-level codes are provided for emerging new cognitive radio users. Furthermore, analytical results of the system performance in a typical cognitive radio... 

    Optimum hello interval for a connected homogeneous topology in mobile wireless sensor networks

    , Article Telecommunication Systems ; Volume 52, Issue 4 , 2013 , Pages 2475-2488 ; 10184864 (ISSN) Nayebi, A ; Sarbazi Azad, H ; Sharif University of Technology
    2013
    Abstract
    Topology of a mobile wireless sensor/ad hoc network is prone to link breakages due to node mobility which compels the periodic re-construction of the topology in so called "hello" intervals. The problem addressed in this paper is determining the maximum "hello" interval preserving the connectivity of a homogeneous topology with high probability. In order to study the optimum "hello" interval, statistical topology lifetime (STL) is formally defined as a value of "hello" interval that ensures statistical connectivity with a given threshold. Temporal properties of the topology are studied based on two phenomena; one concerning a connectivity phase transition with time and the other one... 

    The impact of dispersed PV generation on ramp rate requirements

    , Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012 - Conference Proceedings, 18 May 2012 through 25 May 2012, Venice ; 2012 , Pages 977-982 ; 9781457718281 (ISBN) Arabali, A. S ; Dehghanian, P ; Moeini-Aghtaie, M ; Abbaspour, A ; Sharif University of Technology
    IEEE  2012
    Abstract
    PV generation variability and uncertainty significantly influence operation of the power systems with high penetration of PV sources. The potential impact of distributed PV generation on ramp rate requirements in the IEEE 24-bus system is evaluated in this paper. PV generation and load are, here, probabilistically modeled using actual data and curve fitting approach. Probabilistic unit commitment (UC) based on unit de-commitment method combined with two point estimate method (2-PEM) is used to determine the ramp rate required to compensate for the PV power fluctuations. The proposed method considers stochastic factors and their effects on the dispatch results. Two scenarios are studied to... 

    Incorporating large-scale distant wind farms in probabilistic transmission expansion planning-part II: Case studies

    , Article IEEE Transactions on Power Systems ; Volume 27, Issue 3 , February , 2012 , Pages 1594-1601 ; 08858950 (ISSN) Moeini Aghtaie, M ; Abbaspour, A ; Fotuhi Firuzabad, M ; Sharif University of Technology
    2012
    Abstract
    This paper is the second part of a two-paper set which comprehensively sets forth an innovative approach in transmission grid reinforcement studies in the presence of wind energy. Part I thoroughly defined the theory and algorithms. Here, to trace the feasibility of the proposed algorithm, three different case studies are implemented on the 24-Bus IEEE Reliability Test System (IEEE-RTS). The optimal solutions in Pareto fronts of different cases are reached, analyzed, and the final solution (optimal plan) of each case is obtained using the fuzzy decision making method. Moreover, in order to analyze the effects of variations in the large-scale wind farm generation on the transmission expansion...