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Kyung Do Kim,10 and The Korean Children’s
"... This is an Open Access article distributed under the terms of the Creative Commons Attribution NonCommercial License ..."
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This is an Open Access article distributed under the terms of the Creative Commons Attribution NonCommercial License
Unit Commitment in Power Systems Considering Demand Response and Wind Generation
"... i, j Index for bus. K Index for time. S Index for wind power generation scenario. G Index for generators. NK,NI, NG Number of time periods, buses and generation units of system. (Pdf), ()ki kiC C Pdr Revenue from constant load and responsive load, respectively. StCst, SdCst Start up and shut down c ..."
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cost of Unit g at Time k. A Supply bidding price of Unit g at Time k. minC No load operation cost. Pdfki Nonresponsive demand at Bus i at Time k. kgpwind Wind farm generation at Bus i at Time k. maxkiPdr submitted responsive load at Bus i at Time k. minkiPdx Minimum curtailable load at Bus i at Time k
GroupWise Herding Behavior in Financial Markets: An AgentBased Modeling Approach
, 2013
"... In this paper, we shed light on the dynamic characteristics of rational group behaviors and the relationship between monetary policy and economic units in the financial market by using an agentbased model (ABM), the Hurst exponent, and the Shannon entropy. First, an agentbased model is used to ana ..."
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In this paper, we shed light on the dynamic characteristics of rational group behaviors and the relationship between monetary policy and economic units in the financial market by using an agentbased model (ABM), the Hurst exponent, and the Shannon entropy. First, an agentbased model is used to analyze the characteristics of the group behaviors at different levels of irrationality. Second, the Hurst exponent is applied to analyze the characteristics of the trendfollowing irrationality group. Third, the Shannon entropy is used to analyze the randomness and unpredictability of group behavior. We show that in a system that focuses on macromonetary policy, steep fluctuations occur, meaning that the mediumlevel irrationality group has the highest Hurst exponent and Shannon entropy among all of the groups. However, in a system that focuses on micromonetary policy, all group behaviors follow a stable trend, and the medium irrationality group thus remains stable, too. Likewise, in a system that focuses on both micro and macromonetary policies, all groups tend to be stable. Consequently, we find that group behavior varies across economic units at each irrationality level for micro and macromonetary policy in the financial market. Together, these findings offer key insights into monetary policy.
Technical Notes, Center for Population Economics An Alternative Estimation Approach in Project 3: Twosided Matching
, 2007
"... The purpose of this study is to suggest an alternative approach to estimating the causal effects of urban disparities on health inequality. As pointed out in previous studies, the endogeneity problem may arise in project 3 since anindividual’splaceofresidenceorlocationisachoice variable and thus it ..."
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The purpose of this study is to suggest an alternative approach to estimating the causal effects of urban disparities on health inequality. As pointed out in previous studies, the endogeneity problem may arise in project 3 since anindividual’splaceofresidenceorlocationisachoice variable and thus it can be influenced by both personal characteristics and idiosyncratic health shocks. Therefore, as an alternative empirical method to the previously proposed IV strategy where we need a valid instrument to obtain consistent estimators, we can consider the application of a structural empirical model utilizing a twosided matching model. Briefly speaking, in matching theory a market is the collection of agents who may physically match with each other. We can distinguish matching games from simpler models of markets since agents on all sides of a market make a finite number of matches. And there exists rivalry between agents on the same side of the market to match with agents on the other side (Fox, 2006). What we are looking for is an optimal assignment where every agent is at least as well off under it as under any other stable assignment. Given the fact that each ward has its quota represented by the finite number of households shown in the addresses, and given that there are a finite number of wards and residents to live in them, it is reasonable to think that a matching equilibrium exists in project 3.
2007, ‘Antitrust Policy Toward Horizontal Mergers
 In: Handbook of Industrial Organization
"... Recently there has been a notable increase in interest in antitrust law in much of the world. This chapter discusses antitrust policy toward horizontal mergers, the area of antitrust that has seen some of the most dramatic improvements in both economic tools and the application of economics in enfo ..."
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Cited by 14 (3 self)
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Recently there has been a notable increase in interest in antitrust law in much of the world. This chapter discusses antitrust policy toward horizontal mergers, the area of antitrust that has seen some of the most dramatic improvements in both economic tools and the application of economics in enfocement practice. The chapter discusses theoretical considerations, merger laws and enforcement practices, econometric methods for analyz∗This chapter draws on material in Chapter 3 of Whinston [2006]. I thank Mark Armstrong,
Approximation Algorithms for Clustering Problems
, 2004
"... Clustering is a ubiquitous problem that arises in many applications in different fields such as data mining, image processing, machine learning, and bioinformatics. Clustering problems have been extensively studied as optimization problems with various objective functions in the Operations Research ..."
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Cited by 14 (5 self)
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Clustering is a ubiquitous problem that arises in many applications in different fields such as data mining, image processing, machine learning, and bioinformatics. Clustering problems have been extensively studied as optimization problems with various objective functions in the Operations Research and Computer Science literature. We focus on a class of objective functions more commonly referred to as facility location problems. These problems arise in a wide range of applications such as, plant or warehouse location problems, cache placement problems, and network design problems where the costs obey economies of scale. In the simplest of these problems, the uncapacitated facility location (UFL) problem, we want to open facilities at some subset of a given set of locations and assign each client in a given set D to an open facility so as to minimize the sum of the facility opening costs and client assignment costs. This is a very wellstudied problem; however it fails to address many of the requirements of real applications. In this thesis we consider various problems that build upon UFL and capture additional issues that arise in applications such as, uncertainties in the data, clients with different service needs, and facilities with interconnectivity requirements. By focusing initially on facility location problems in these new models, we develop new algorithmic techniques that will find application in a wide range of settings. We consider a widely used paradigm in stochastic programming to model settings where the underlying data, for example, the locations or demands of the clients, may be uncertain: the 2stage with recourse model that involves making some initial decisions, observing additional information, and then augmenting the initial decisions, if necessary, by taking recourse actions. We present a randomized polynomial time
High Breakdown Voltage AlGaN/GaN HEMTs Employing Recessed Gate Edge Structure
"... We have proposed and fabricated a new AlGaN/GaN high electron mobility transistor (HEMT) employing the recessed gate edge structure. The breakdown voltage and the leakage current of the new AlGaN/GaN HEMT was improved due to reduced electric field concentration at the gate edge. The breakdown voltag ..."
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We have proposed and fabricated a new AlGaN/GaN high electron mobility transistor (HEMT) employing the recessed gate edge structure. The breakdown voltage and the leakage current of the new AlGaN/GaN HEMT was improved due to reduced electric field concentration at the gate edge. The breakdown voltage of the proposed device was 1160 V while that of the conventional device was 962 V. The leakage current of the proposed device was 1 order less than that of conventional device. The forward characteristic of proposed device is slightly degraded due to the decrease of 2DEG density.
AlGaN/GaN Schottky Barrier Diodes Employing Diamondlike Carbon passivation
"... AlGaN/GaN Schottky Barrier Diodes (SBDs) employing the Diamondlike Carbon (DLC) passivation was proposed. The reverse blocking characteristics of the AlGaN/GaN SBD is degraded by the electron trapping effect through the surface trap states. In order to suppress the electron trapping effect and incr ..."
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AlGaN/GaN Schottky Barrier Diodes (SBDs) employing the Diamondlike Carbon (DLC) passivation was proposed. The reverse blocking characteristics of the AlGaN/GaN SBD is degraded by the electron trapping effect through the surface trap states. In order to suppress the electron trapping effect and increase the breakdown voltage of AlGaN/GaN SBDs, the surface passivation or treatment should be performed. In this paper, we proposed the DLC film as passivation layer on AlGaN/GaN SBD which exhibits superb dielectric characteristics such as high resistivity, high critical electric field and low dielectric constant. We successfully increased the breakdown voltage of AlGaN/GaN SBDs from 204 V to 1422 V by performing the DLC passivation. The ideality factor was improved from 1.959 to 1.273. And, the Schottky Barrier height was increased from 0.67 eV to 0.8 eV after the DLC passivation. However, the forward current was degraded a little due to the intrinsic stress of the DLC film.
Secrecy Capacity over Correlated Ergodic Fading Channel
, 2008
"... We investigate the secrecy capacity of an ergodic fading wiretap channel in which the main channel is correlated with the eavesdropper channel. In this study, the full Channel State Information (CSI) is assumed, and thus the transmitter knows the channel gains of the legitimate receiver and the eave ..."
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Cited by 5 (0 self)
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We investigate the secrecy capacity of an ergodic fading wiretap channel in which the main channel is correlated with the eavesdropper channel. In this study, the full Channel State Information (CSI) is assumed, and thus the transmitter knows the channel gains of the legitimate receiver and the eavesdropper. By analyzing the resulting secrecy capacity we quantify the loss of the secrecy capacity due to the correlation. In addition, we study the asymptotic behavior of the secrecy capacity as SignaltoNoise Ratio (SNR) tends to infinity. The capacity of an ordinary fading channel logarithmically increases with SNR. On the contrary, the secrecy capacity converges into a limit which can be an upper bound on the secrecy capacity over the fading wiretap channel. We find a closed form of the upper bound for the correlated Rayleigh wiretap channel which also includes the independent case as a special one. Our work shows that the upper bound is determined by only two channel parameters; the correlation coefficient and the ratio of the main to the eavesdropper channel gains that will be called PCC and CGR respectively. The analysis of the upper bound tells how the two channel parameters affect the secrecy capacity and leads to the conclusion that the excessively large signal power does not provide any advantage in the secrecy capacity, and the loss due to the correlation is especially serious in low CGR regime.
Results 1  10
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172