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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Operations Research and Management Science Society
Journal Basic Information
Journal DOI :
The Korean Operations and Management Science Society
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Volume & Issues
Volume 38, Issue 4 - Dec 2013
Volume 38, Issue 3 - Sep 2013
Volume 38, Issue 2 - Jun 2013
Volume 38, Issue 1 - Mar 2013
Selecting the target year
A Study on Inferior Products Effects in the Pharmaceutical Market
Jung, Heonsoo ; Kim, Kyungtae ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 1~12
DOI : 10.7737/JKORMS.2013.38.3.001
The increased interest in the market movement towards generic products has been observed these days. Throughout the attraction theory, this study first explains how generic product introduction has an impact on original products. This study also shows how the social conformity theory is empirically applied to explanation of the attraction effects regarding generic products.
A Study on the Optimal Appointment Scheduling for the Ship Maintenance with Queueing System with Scheduled Arrivals
Ko, Jae-Woo ; Kim, Gak-Gyu ; Yun, Bong-Kyu ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 13~22
DOI : 10.7737/JKORMS.2013.38.3.013
Queueing system with scheduled arrivals is useful in many fields where both customers` waiting time and servers` operation time (utilization) are important, and arrival time of customers is possible to be controlled. In this paper, we analyzed the operation of ship maintenance with the queueing system with scheduled arrival. Based on the model presented by Pegden and Rosenshine , who dealt with exponential service time, we extended the service time distributions to phase-type distribution which is able to include a wide range of real stochastic phenomena. Since most activities in the military are carried out under tight control and schedule, scheduled arrival queue has quite good applicability in this area. In this context, we applied queue with scheduled arrival to the optimal booking time decision for the ship maintenance in the navy.
A Study on Railroad Track Capacity According to Transit Railway Demand
Kim, Ickhee ; Kim, Incheol ; Bae, Yeong-Gyu ; Wang, Yeondae ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 23~35
DOI : 10.7737/JKORMS.2013.38.3.023
It is very important that the calculation of railroad track capacity in infrastructure investment analysis and train operation planning. The dwelling time is one of the factors that influence in railroad track capacity. Current research in dwelling time has been focusing on theoretical investigation, the state of the research in effective variable (dwelling time etc) is insufficient. In this paper, we clearly draw the concept of railroad track capacity and the estimate on modeling of relationship railway demand and dwelling time. Also, we compare and analyze the variation of railroad track capacity according to transit railway demand in Gyeongin Line (Guro~Inchon). This paper is expected to contribute for improving on the in-using equations and methods in train operation planning as well as for improving level of service on railway user.
Types of Train Delay of High-Speed Rail : Indicators and Criteria for Classification
Kim, Hansoo ; Kang, Joonghyuk ; Bae, Yeong-Gyu ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 37~50
DOI : 10.7737/JKORMS.2013.38.3.037
The purpose of this study is to determine the indicators and the criteria to classify types of train delays of high-speed rail in South Korea. Types of train delays have divided into the chronic delays and the knock-on delays. The Indicators based on relevance, reliability, and comparability were selected with arrival delay rate of over five minutes, median of arrival delays of preceding train and following train, knock-on delay rate of over five minutes, correlation of delay between preceding train and following train on intermediate and last stations, average train headway, average number of passengers per train, and average seat usages. Types of train delays were separated using the Ward`s hierarchical cluster analysis. The criteria for classification of train delay were presented by the Fisher`s linear discriminant. The analysis on the situational characteristics of train delays is as follows. If the train headway in last station is short, the probability of chronic delay is high. If the planned running times of train is short, the seriousness of chronic delay is high. The important causes of train delays are short headway of train, shortly planned running times, delays of preceding train, and the excessive number of passengers per train.
Adoption and Diffusion Speed of New Technology with Network Externality in a Two-level Supply Chain : An Approach to Relative Factors in Buyer-Supplier Relationships
Choi, Daeheon ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 51~70
DOI : 10.7737/JKORMS.2013.38.3.051
This paper develops a model to predict the adoption and level of usage of network technology in a two-level supply chain with buyer-supplier relationships. A firm`s adoption of a new technology depends not only on its own beliefs of the new technology`s costs and benefits, but also on the adoption decisions of other firms in the supply chain. A model first analyzes an individual supplier`s decision about a new technology adoption considering with multiple suppliers and buyers. Individual suppliers` decisions are aggregated with a population model to project how new technology diffuses across the supply chain and examine the pattern of diffusion process. This study found that as more firms adopt in initial periods, the total amount of information to the potential adopters in the population increases, and then the number of firms persuaded by the information increases as the process moves up the distribution of adoption process. We consider three factors influencing the diffusion speed of the new technology in a supply chain network : mean benefits, cost sharing, and information provision. This study examines how such factors affect the reduction of threshold levels, which implies that reductions in threshold levels have an aggregate effect by accelerating the rate of adoption. In particular, we explore relationship factors available in practice in a buyer-supplier relationship and numerically examines how these relationship factors contribute to increase the diffusion speed of the technology in a two-level supply chain.
A Study on Determinants of Growth of Social Commerce : Roles of Social Media and Customer
Choi, Sungho ; Park, Kyung Min ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 71~86
DOI : 10.7737/JKORMS.2013.38.3.071
This research explores the question how interactions between customer and firm affect firm growth. To test suggested hypotheses, this study collects data on social commerce industry in Korea during the period from the beginning of social commerce industry in Korea, May 2010, to March 2012, and investigates the effect of social media on the growth of social commerce firms. We suggest two hypotheses in this study. First, as web traffic inflow through social media into a focal social commerce increases, the growth rate of the focal social commerce increases. Second, the more diverse social media channel through which web traffic inflows into a focal social commerce, the weaker the positive effect of web traffic inflow on the growth rate of the focal social commerce. Analysis of data shows that inflow through social media is positively related to the growth of social commerce. In addition, our analysis shows that inflow channel diversity weakens the positive relationship between web traffic inflow through social media and growth rate of social commerce firms. These results suggest that firms need to concentrate on few social media in order to attract customers. The study contributes to understanding how interaction between firms and customers influences the growth of the firm.
Analytical Effect of Retailers Pull-to-center Behavior on Determining Optimal Buyback Price
Lee, Jung Min ; Seo, Yong Won ; Park, Chan-Kyoo ;
Journal of the Korean Operations Research and Management Science Society, volume 38, issue 3, 2013, Pages 87~101
DOI : 10.7737/JKORMS.2013.38.3.087
The purpose of this paper is to analyze supplier`s optimal decision of the buyback price facing irrational retailers. It has been known that retailers show irrational ordering behaviors, such as pull-to-center effect. We model the retailer`s pull-to-center behavior and derive the supplier`s optimal buyback price considering the retailer`s bounded rationality. The result shows that the supplier`s profit can be significantly improved exploiting the retailer`s irrationality in the ordering behavior.