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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 34, Issue 4 - Dec 2009
Volume 34, Issue 3 - Sep 2009
Volume 34, Issue 2 - Jun 2009
Volume 34, Issue 1 - Mar 2009
Selecting the target year
The Effects of MPPA(Mileages/Points to Purchase Amount) Ratio on Consumer Preference
Park, Sang-June ; Byun, Ji-Yeon ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 1~10
Consumers earn a number of points for every purchase and then they can exchange a specified number of points for a desired reward in a typical loyalty program. The immediate payoff of their effort given as points is not the real reward they actually care about. It is merely an instrument (or medium) which has no value in itself. In a real world, consumers frequently choose the option with a bigger medium even though the economic value of the option is not changed by the medium. We call it 'medium effect.' In this study we explored if the size of medium affects consumers' preferences. For this we controlled the reward options with three types of medium (small, medium, big) and measured the magnitude of preference difference among the three types of reward options. In addition, we manipulated comparability of reward options with wine and gas discount coupon. We confirmed that choosing one of two wines was easier than that of the two gas coupons. 123 respondents were allocated into three experimental groups. In three experimental grounds, the ratios of the focused reward option's medium to the compared reward option's medium were different. For example, the focused reward option has 10 million points whereas the compared reward option has 10 million points for 1 million won purchase amount in the first group. Then each respondent was asked to choose one of two loyalty programs (focused program vs. compared program) in two different conditions (comparability between reward options. easiness vs. difficulty). To compare the medium effects among the experiment conditions we used chi-squares tests. The empirical results show consumer preference increases and then decreases as reward mile-ages/points given according to purchase amount increase. Additionally, they let us know that comparability of alter natives affects change of consumer preference by reward mileages/points.
Optimal Imperfect-Quality Inventory Models for Continuous and Discrete Shipping with Process Improvement and Setup Reduction
Kim, Dae-Soo ; Yoo, Seung-Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 11~28
Intelligent investment in setup cost reduction and process reliability improvement is crucial to an emerging integrated lean six sigma practice today. This study examines a cost-minimizing problem of jointly determining production lot size, setup cost reduction, and process reliability improvement decisions for a manufacturer with an imperfect production process. We develop models for previously untapped discrete shipping in a supply chain context as well as continuous shipping and solve them optimally using differential calculus and nonlinear programming. We also conduct analytic and numerical sensitivity analyses to provide various important managerial insights into practices.
Design of a Curtailed-SPRT Control Chart
Chang, Young-Soon ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 29~37
This paper proposes a curtailed-sequential probability ratio test (SPRT) control chart. For using the conventional SPRT control chart, the number of items inspected in a sampling point should have no restriction since items in a sampling point are inspected one by one until an SPRT Is terminated. The number of observations taken in a sampling point, however, has an upper bound since sampling and testing of an item is time-consuming or expensive. When the sample size reaches the upper bound without evidence of an in-control or out-of-control state of a process, the proposed chart makes a decision using the sample mean of all observations taken in a sampling point. The properties of the Proposed chart are obtained by a Markov chain approach and the performance of the chart is compared with fixed sample size (FSS) and variable sample size (VSS) control charts. A comparative study shows that the proposed chart performs better than VSS control charts as well as conventional FSS control charts.
Resource Allocation Algorithm for Differentiated Multimedia Services Using Came Theory
Shin, Kwang-Sup ; Jung, Jae-Yoon ; Suh, Doug-Young ; Kang, Suk-Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 39~59
Game theory is adapted to a variety of domains such as economics, biology, engineering, political science, computer science, and philosophy in order to analyze economic behaviors. This research is an application of game theory to wireless communication. In particular, in terms of bargaining game we dealt with a multimedia resource allocation problem in wireless communication, which is rapidly spreading such as Wibro, WCDML, IPTV, etc. The algorithm is assumed to allocate multimedia resources to users who can choose and access differentiated media services. For this purpose, 3 utility function of users is devised to reflect quality of service (QoS) and price. We illustrated experimental results with synthesis data which were made to mimic real multimedia data, and analyzed differentiated service providing and the effect of the utility function.
A Variable Demand Traffic Assignment Model Based on Stable Dynamics
Park, Koo-Hyun ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 61~83
This study developed a variable demand traffic assignment model by stable dynamics. Stable dynamics, suggested by Nesterov and do Palma, is a new model which describes and provides a stable state of congestion in urban transportation networks. In comparison with the user equilibrium model, which is based on the arc travel time function in analyzing transportation networks, stable dynamics requires few parameters and is coincident with intuitions and observations on congestion. It is therefore expected to be a useful analysis tool for transportation planners. In this study, we generalize the stable dynamics into the model with variable demands. We suggest a three stage optimization model. In the first stage, we introduce critical travel times and dummy links and determine variable demands and link flows by applying an optimization problem to an extended network with the dummy links. Then we determine link travel times and path flows in the following stages. We present a numerical example of the application of the model to a given network.
Analyzing Fee Structure of Online Marketplaces Based on Competition among Sellers and Competition among Buyers
Jung, Young-Jo ; Jang, Dae-Chul ; Ann, Byong-Hun ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 85~100
An online marketplace, such as eBay, is an example of two-sided markets. In online marketplaces, there are transactions between sellers and buyers and direct competition effects among sellers and among buyers. Previous research on two-sided market has not handle these competition effects and mostly focused on indirect network externalities between sellers and buyers. We analyze the fee structure of an online marketplace considering direct competition effects among sellers and among buyers. We find that when fees for sellers and buyers can be imposed, an auction or fixed-pricing rule can be chosen according to the characteristics of a product traded. But when only fees for sellers can be imposed, an auction can be taken as a trading mechanism solely.
Evaluation of TQM Implementation in Manufacturing-based R&D Organizations
Hong, Soon-W. ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 101~121
The research literature presents that Total Quality Management (TQM) has been successfully embraced by firms for strategic and operational management in the last decades. However few studios analyze the role of TQM practices in the R&D environment. The objective of this study is to evaluate TQM practices implemented in manufacturing-based R&D organizations with respect to R&D performance. Our research model is primarily based on Malcolm Baldrige Criteria for Performance Excellence framework, including three moderating variables (industry type, organization size, quality management system certification), to propose hypotheses on the relationships between leadership practice, management practice and R&D performance. Results of canonical correlation analysis using data from 130 R&D organizations show that in aggregate leadership practice is positively related to management practice which is, in turn, positively related to R&D performance. These relationships are, however, affected by the moderating variables. Our results imply that TQM practices can be strategically adopted in the R&D organization.
The Third-Party Logistics Provider's Preference on Home Delivery Company
Park, Sang-June ; Lee, Seung-Soo ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 123~132
Third Party Logistics (TPL) providers offer outsourced logistics services to companies for part or sometimes all of their supply chain management. Although TPL market is increasing rapidly and drawing much attention from various aspects, it is not easy to find the researches dealing with relations between TPL providers and home delivery companies dealing with small-sized cargo. This study focused on service dimensions which TPL providers consider when they choose a home delivery company. In this paper, we found five factors of service dimensions including delivery charge, logistics management shills, partnership, and then investigated which dimensions affect TPL providers' preference. In addition, we showed that the logistics management skills are more important than the delivery charge which has commonly been considered the most important factor. This study offers managerial insights on TPL providers' prefer once which we can hardly find in theoretical and practical perspective.
Pricing Strategy, Profit Sharing, and Market Structure in Digital Music Contents Industry
Jang, Dae-Chul ; Ahn, Byong-Hun ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 133~152
This paper analyze the fee structures of digital music contents and the revenue sharing ratios that are now on-going debates in Korean digital contents industry. Especially we consider Korean situation where copyrighters and telecom companies have conflict of interest. We found two major results. First, the choice between the flat rate scheme and the usage-based rate scheme is not important to telecom companies and copyrighters. The important thing is that copyrighters should decide the revenue sharing ratio and given that telecom companies should decide the retail price. Consequently, this way can lead to win-win solutions between them. Second, the flat rate scheme affects the relationship between consumers and telecom companies. Under the flat rate scheme, telecom companies have more benefits than consumers. In the vertical integrated structure, particularly, this tendency is more severe.
Ant Colony System for Vehicle Routing Problem with Time Window
Lee, Sang-Heon ; Lee, Seung-Won ;
Journal of the Korean Operations Research and Management Science Society, volume 34, issue 1, 2009, Pages 153~165
This paper apollos an ant colony system (ACS) for the vehicle routing problem with time window (VRPTW). The VRPTW is a generalization of the VRP where the service of a customer can begin within the time windows defined by the earliest and latest times when the customer will permit the start of service. The ACS has been applied effectively in geographical environment such as TSP or VRP by meta-heuristic that imitate an ant's biologic special duality in route construction, 3 saving based ACS (SB-ACS) is introduced and its solution is improved by local search. Through iterative precesses, the SB-ACS is shown to drive the best solution. The algorithm has been tested on 56 Solomon benchmarking problems and compared to the best-known solutions on literature. Experimental results shows that SB-ACS algorithm could obtain food solution in total travel distance minimization.