Go to the main menu
Skip to content
Go to bottom
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
Editor in Chief :
Volume & Issues
Volume 33, Issue 4 - Dec 2008
Volume 33, Issue 3 - Sep 2008
Volume 33, Issue 2 - Jun 2008
Volume 33, Issue 1 - Mar 2008
Selecting the target year
A Study on Determinants of Category Diversification of Internet Portals in Korea
Park, Kyung-Min ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 1~12
The study suggests an answer to the question of what determines category diversification of Internet portals in Korea. First, as external factors, competition intensity and market growth are hypothesized to have influence on the degree of category diversification. Second, an internal factor, user loyalty to portals, is hypothesized to influence negatively category diversification. The study performed empirical analysis based on weekly portal-specific panel data of eighteen internet portals in Korea during the period between 2001 and 2004. The result shows that category diversification increases as competition intensity increases, and that category diversification decreases as user loyalty increases. There was no effect of market-level growth rate on category diversification.
An Exploratory Study on the Suppliers' Strategy for Developing Long-term Relationship with Buyers
Lee, Youn-Suk ; Shin, Ho-Jung ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 13~30
We explore the determinants of long-term relationship between the buyer and the supplier to help suppliers develope a strategy to build long-term relationship with their buyers. Based upon an extensive literature review, we propose three droops of independent variables which may affect long-term relationship, including (a) environmental factors (product complexity, product importance, source dependence, price sensitivity), (b) relational factors(trust, commitment, satisfaction, intention of expansion), (c) operational performance(quality, delivery, cost capability, technical knowhow). The buyer's actual period of relationship with its main supplier is used as a dependent variable. Using hierarchical multiple regression analysis, we empirically test hypotheses, analysing a sample of 290 manufacturing firms in the U.S. The statistical results indicate that the buyer's source dependence, price sensitivity and the supplier's commitment play a significant role in establishing long-term relationship between the buyer and the supplier. However, the supplier's cost capability and technical knowhow in operational performance negatively affect long-term relationship in contrast with our hypotheses. Due to this controversial result, we divide the sample group Into dual sourcing and multiple sourcing environments and reconduct regression analysis in a post hoc manner. The findings show that the supplier's cost capability and technical knowhow are negatively associated with the length of relationship only in the multiple sourcing environment. The results may confirm that both parties' opportunistic behavior is more salient in the multiple sourcing environment than in the single sourcing environment.
System Development Considering User Preferences on Context-Aware Computing Environment
Kim, Jun-Young ; Hong, Jong-Yi ; Suh, Eui-Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 31~51
Predicting the preferences of users and providing the personalized services/products based on users' preferences is one of the important issues. However, the research considering users' preferences on context-aware computing is a relatively insufficient research field. Hence, this paper aims to propose a framework for providing the personalized services based on context history in context-aware computing. Based on this framework, we have implemented a prototype system to show the feasibility of the framework. Previous researches have reasoned the preferences of the user considering only the user's input, but this research provides the personalized services using the relationship between users' profile and services.
A Note on Production and Shipment Lot Sizing in a Vendor-Buyer Supply Chain with Transportation Cost
Kim, Chang-Hyun ; Kim, Tae-Bok ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 53~61
Recently, Ertogral et al. suggested two models considering the transportation cost based on single-vendor single-buyer integrated production-inventory problem. Although their problem-solving algorithm guarantees solutions obtained are optimal, a limitation is revealed that its performance can be inefficient due to complete enumeration search in a certain range. In this paper, a more efficient algorithm in finding optimal solutions is suggested for the same problem suggested by Ertogral et at.. Numerical examples are presented for illustrative purpose.
Optimized Structures with Hop Constraints for Web Information Retrieval
Lee, Woo-Key ; Kim, Ki-Baek ; Lee, Hwa-Ki ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 63~82
The explosively growing attractiveness of the Web is commencing significant demands for a structuring analysis on various web objects. The larger the substantial number of web objects are available, the more difficult for the clients(i.e. common web users and web robots) and the servers(i.e. Web search engine) to retrieve what they really want. We have in mind focusing on the structure of web objects by introducing optimization models for more convenient and effective information retrieval. For this purpose, we represent web objects and hyperlinks as a directed graph from which the optimal structures are derived in terms of rooted directed spanning trees and Top-k trees. Computational experiments are executed for synthetic data as well as for real web sites' domains so that the Lagrangian Relaxation approaches have exploited the Top-k trees and Hop constraint resolutions. In the experiments, our methods outperformed the conventional approaches so that the complex web graph can successfully be converted into optimal-structured ones within a reasonable amount of computation time.
An Aggressive Formulation of Cross-efficiency in DEA
Lim, Sung-Mook ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 83~100
We propose a new aggressive formulation of cross-efficiency in Data Envelopment Analysis(DEA). In the traditional aggressive formulation, the efficiency score of a test DMU is maximized as the first goal while an average of efficiency scores of peer DMUs is minimized as the second goal. The proposed model replaces the second goal with the minimization of the best efficiency score of peer DMUs. We showed the model is a quasi-convex optimization problem, and for a solution method we developed a bisection method whose computational complexity is polynomial-time. We tested the model on 200 randomly generated DEA problems, and compared it with the traditional model in terms of various criteria. The experimental results confirmed the effectiveness and usefulness of the proposed model.
An Exploratory Comparison of Supply Chain Integration Practices of Korean and International Manufacturing Plants in Automotive, Electronics, and Machinery Industries
Hur, Dae-Sik ; Kim, Kil-Sun ; Choi, Jeong-Wook ;
Journal of the Korean Operations Research and Management Science Society, volume 33, issue 4, 2008, Pages 101~118
This study compares supply chain integration practices of high performing manufacturing plants in Korea and those in the U.S., Japan, and six European countries. Data were drawn from the High Performance Manufacturing(HPM) Round 3, a joint data-collection effort on manufacturing and supply chain management. Specifically, in the automotive, electronics, and machinery industries, we selected twenty Korean plants with high performance reputation and chose the same number of non-Korean plants(HPM top 20), based upon their competitive manufacturing capability index and customer satisfaction index. The Korean plants do not significantly differ from HPM top 20 plants in that internal value creation activities are coordinated and integrated at the corporate level and between plants. The Korean plants, however, demonstrated more integration with suppliers than with customers, and only the two of them were classified as 'outward facing', which pursues greater integration with both customers and suppliers. Unbalanced and lower integration with customers of the Korean plants was attributed to the lower than expected manufacturing capability and customer satisfaction. Implications for supply chain professionals were discussed.