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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Operations Research and Management Science Society
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Journal DOI :
The Korean Operations and Management Science Society
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Volume & Issues
Volume 30, Issue 4 - Dec 2005
Volume 30, Issue 3 - Sep 2005
Volume 30, Issue 2 - Jun 2005
Volume 30, Issue 1 - Mar 2005
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An Extended Mutual Reinforcement Model for Finding Hubs and Authorities from Link Structures on the WWW
Hwang Insoo ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 1~11
The network structures of a hyperlinked environment can be a rich source of information about the contents of the environment and it provides effective means for understanding it. Recently, there have been a number of algorithms proposed analyzing hypertext link structure so as to determine the best authorities for a given topic or query. In this paper, we review the algorithm of mutual reinforcement relationship for finding hubs and authorities from World Wide Web, and suggest SHA, a new approach for link-structure analysis, which uses the relationships among a set of relative authoritative pages, a set of hub pages, and a set of super hub pages.
Influence of Coupon Duration on Consumer's Behavior : Three or Wore Brands in the Market
Park Haechurl ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 13~27
This research deals with the issues concerning how consumers change their purchase behavior if one of brands in the market prolongs its coupon duration while there are more than two brands. If they extend coupon duration of a brand, consumers increase Purchase of the brand with coupons. But they increase or reduce purchase of competing brands with coupons depending on the condition of the market. increase of purchase of the brand with prolonged coupons stems from reducing purchase of the consumer's most favorite brands with regular price and their less preferred brands with coupons. On the other hand, consumers who prefer the brand at in-between level tend to reduce purchase of competing brands with coupons under certain conditions. Therefore firms which do not have dominant market positions have strong incentive for strategic alliance in terms of coupon duration.
A Packet Scheduling Algorithm and Efficient Framing Method for Next Generation Wireless Communication System and its Performance
Baek Jang Hyun ; Kim Dong Hoi ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 29~40
In this research, we propose packet scheduling algorithm considering different QoS characteristics of real-time traffic and non-real-time traffic in the next generation wireless communication system serving the multimedia traffic and a new efficient framing method cooperated with this packet scheduler. When the selected traffic classes of the selected users are transmitted, our proposed framing method can increase the number of serviced traffic classes by mixing the many different traffic classes within one frame considering data rate decided by the allocated AMC (Adaptive Modulation and Coding) option. Using this proposed method, the fairness among the traffic classes can be achieved and the system performance for total throughput and delay can be enhanced. Simulations are performed to analyze the performance of the proposed framing method. Our proposed packet scheduler and framing method will be applied to the next generation multimedia wireless communication system serving many traffic classes.
Survey on Revenue Management Models for Airlines
Yoon Moon-Gil ; Lee Hwi-Young ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 41~61
The concept of revenue management (RM) has been used widely in the air-transportation industry, and proven as a good system for managing perishable assets. While the airlines are the oldest and most sophisticated users of RM, these practices have been an enormously important innovation in other service industries such as the travel, the railway, the internet and the manufacturing industries. In this paper, reviewing several studies on RM, we introduce the fundamental concepts and the major models of RM covering seat allocation with multiple fare classes and overbooking. Future research directions also are suggested.
Analysis of Common Cause Failure Using Two-Step Expectation and Maximization Algorithm
Baek Jang Hyun ; Seo Jae Young ; Na Man Gyun ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 63~71
In the field of nuclear reactor safety study, common cause failures (CCFs) became significant contributors to system failure probability and core damage frequency in most Probabilistic risk assessments. However, it is hard to estimate the reliability of such a system, because of the dependency of components caused by CCFs. In order to analyze the system, we propose an analytic method that can find the parameters with lack of raw data. This study adopts the shock model in which the failure probability increases as the shock is cumulated. We use two-step Expectation and Maximization (EM) algorithm to find the unknown parameters. In order to verify the analysis result, we perform the simulation under same environment. This approach might be helpful to build the defensive strategy for the CCFs.
Application of (Max, +)-algebra to the Waiting Times in Deterministic 3-node Tandem Queues with Blocking
Seo Dong-Won ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 73~80
In this paper, we consider characteristics of waiting times in s1n91e-server 3-node tandem queues with finite buffers, a Poisson arrival process and deterministic service times at all nodes. There are three buffers : one at the first node is infinite and the others are finite. We obtain the fact that sojourn time or departure process is independent of the capacities of the finite buffers and does not depend on the order of service times, which are the same results in the literature. Moreover, the explicit expressions of stationary waiting times in all areas of the systems can be derived as functions of the finite buffer capacities. We also disclose a relationship of waiting times in subareas of the systems between two blocking policies communication and manufacturing. Some numerical examples are also provided.
A Study about the Mediating Effects of Website Attitude and Trust in Continuously using the Website
Lee Kook-Yong ; Hyung Sung-Woo ; Park Kyung-Soo ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 81~104
In the past days, most of studies about users' behavior in online environments have been mainly focused on the adoption of website and internet shopping or shopping mall. But the generic model of website usage behavior has not been made and the leading theory of website usage behavior has not been existed. The purpose of this study consists of two parts: (1) to find the determinant variables of the website users' continuous using Intention in a certain website, (2) to examine the relative influences of the variables influencing the users' behavior in online environments. The framework of this study is based on the combination of some theories - Davis(1989)'s TAM, Fishbein(1975)'s TRA, Hoffman et al.(1997), Schneiderman(2000), Yoon(2002), Lee and Turban(2001), Sultan et al.(2002), Shankar et al.(2002a, 2002b), McKnight et al.(2002), Chen and Dhillon(2003), Heijden(2003) and so on. Major findings of this research are summarized as fellows: First, determinant of website continuous using intention was affected by 1) the-attitude and 2) the trust of the website except of perceived usefulness. Second, the website attitude was affected by the perceived usefulness, design, experience, reputation. But perceived ease of use did not affect the website attitude. Third, the website trust was affected by the perceived usefulness, perceived ease of use, design, experience of website. But the reputation of website did not determine the trust of Website in this research model.
A Long-term Capacity Reservation Contract
Kim Yong Chan ; Kim Jong Soo ; Kang Woo Seok ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 105~115
By committing to a long-term replenishment contract, buyers can purchase a product at a lower price from a supplier who is less pressured to find new customers due to the long-term contract and can charge a discounted price. We develop an analytical model from the buyer's perspective to investigate a capacity reservation contract. We are considering the system with a single supplier and a buyer. The buyer can purchases any desired amount from a spot market at a higher price in addition to the contracted amount. For such a system, we propose an algorithm to derive the optimal contract terms. The result of computational experiments shows that the algorithm finds the global optimum solution in a resonable amount of time.
Sensitivity Analysis for a Make-to-Order Inventory-Production System with Limited Order Acceptance Level
Kim Eungab ; Kim Jiseung ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 117~129
This paper considers a make-to-order inventory-production system in which customer orders are admitted only when the number of outstanding customer orders is below a value committed by the system. We deal with general distributions for the customer order Inter-arrival, production, and replenishment lead time processes. Monotonicities of the optimal average cost with respect to these distribution parameters are established using sample path coupling arguments. When distributions are given as an exponential one, we implement a sensitivity analysis on the optimal inventory policy and show that it has monotonicities with respect to system costs using dynamic programming.
A Threshold QBD Queueing Model for Web Server System
Lee Ho Woo ; Cho Eun-sung ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 131~142
This paper proposes queueing models for a Web server system which is composed of an infinite-buffer main server and finite-buffer auxiliary server(s). The system is modeled by the level-dependent quasi-birth- death (QBD) process. Utilizing the special structure of the QBD, we convert the infinite level-dependent QBD into a finite level-independent QBD and compute the state probabilities. We then explore the operational characteristics of the proposed web-server models and draw some useful conclusions.
Facility Location Planning with Realistic Operation Times in Supply Chain
Lee Sang Heon ; Kim Sook Han ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 143~156
Facility location planning (FLP) problem is the strategic level planning in supply chain. The FLP is significantly affected by the operation time of each facility. In most of the FLP researches, operation time of facility has been treated as a fixed value. However, the operation time is not a static factor in real situations and the fixed operation time may lead unrealistic FLP. In this paper, a mixed integer programming (MIP) model is proposed for solving the 3-stage FLP problem and operation times are adjusted by the results from the simulation model and an iterative approach combining the analytic model and simulation model is proposed to obtain more realistic operation plans for FLP problems.
Perturbation Using Out-of-Kilter Arc of the Asymmetric Traveling Salesman Problem
Kwon Sang Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 157~167
This paper presents a new perturbation technique for developing efficient iterated local search procedures for the asymmetric traveling salesman problem(ATSP). This perturbation technique uses global information on ATSP instances to speed-up computation and to improve the quality of the tours found by heuristic method. The main idea is to escape from a local optima by introducing perturbations on the out-of-kilter arcs in the problem instance. For a local search heuristic, we use the Kwon which finds optimum or near-optimum solutions by applying the out-of-kilter algorithm to the ATSP. The performance of our algorithm has been tested and compared with known method perturbing on randomly chosen arcs. A number of experiments has been executed both on the well-known TSPLIB instances for which the optimal tour length is known, and on randomly generated Instances. for 27 TSPLIB instances, the presented algorithm has found optimal tours on all instances. And it has effectively found tours near AP lower bound on randomly generated instances.
The Effect of Service Quality on Customer Satisfaction in a Internet Shopping Mall : The Moderating Role of the Internet Community Type
Kim Jung Wook ; Koh Joon ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 169~184
This study aims to identify service factors that satisfy customers in the internet shopping mail context. The study examines the relationship between service qualify and customer satisfaction, and explores the moderating role of the internet community type (i. e., transaction community group, interest community group and fantasy community group). By analyzing 188 questionnaires, we found that out of the five service quality dimensions, only reliability, tangibility, assurance and responsiveness dimensions have positive effects on customer satisfaction. We also found that there is a significant difference in the relationship between service quality and customer satisfaction by the perceived type of internet community implications of the findings and future research directions are discussed.
Architecture of XRML-based Comparison Shopping Mall and Its Performance on Delivery Cost Estimation
Lee Jae Kyu ; Kang Juyoung ;
Journal of the Korean Operations Research and Management Science Society, volume 30, issue 2, 2005, Pages 185~199
With the growth of internet shopping malls, there is increasing interest in comparison shopping mall. However most comparison sites compare only book prices by collecting simple XML data and do not provide .the exact comparison Including precise shipping costs. Shipping costs vary depending on each customer's address, the delivery method, and the category of selected goods, so rule based system is required in order to calculate exact shipping costs. Therefore, we designed and implemented comparison shopping mall which compares not only book prices but also shipping costs using rule based inference. By adopting the extensible Rule Markup language (XRML) approach, we proposed the methodology of extracting delivery rules from Web pages of each shopping mall. The XRML approach can facilitate nearly automatic rule extraction from Web pages and consistency maintenance between Web pages and rule base. We developed a ConsiderD system which applies our rule acquisition methodology based on XRML. The objective of the ConsiderD system is to compare the exact total cost of books including the delivery cost over Amazon.com, BarnesandNoble.com, and Powells.com. With this prototype, we conducted an experiment to show the potential of automatic rule acquisition from Web pages and illustrate the effect of delivery cost.