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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
Editor in Chief :
Volume & Issues
Volume 32, Issue 4 - Dec 2007
Volume 32, Issue 3 - Sep 2007
Volume 32, Issue 2 - Jun 2007
Volume 32, Issue 1 - Mar 2007
Selecting the target year
Determining the Number of Storage Rooms and the Layout of the Storage Room in Warehouses for Pyramid-typed Stacks
Park, Twae-Kyung ; Kim, Kap-Hwan ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 1~15
This paper proposes a method for determining the number of storage rooms and designing the storage layout in warehouses for pyramid type stacks whose example are slacks for steel coils, paper rolls, and drums for oils. Formulas are derived for estimating the expected values and the variances of various handling times by cranes. From the derived formulas, the expected queuing time of road trucks is estimated. Base on the derived formulas, this study derives the cost function for determining the optimal numbers of rows, bays, and tiers of stacks and sizing cranes under the condition that the requirement for storage space is satisfied. Results of numerical analysis are provided.
A Study on the Effects of Visual Aesthetics and Usability of Web Site Design on their Performance
Kim, Seung-Kyung ; Lee, Jae-Kwan ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 17~40
Most research on web site design has focused on technological factors, while visual aesthetic factors have been considered less important. In contrast, this study focuses on visual aesthetic factors in web site design. Findings of this study can be summarized as follows : (1) The result of SPSS-factor analysis shows that there are 3 distinct factors, 'classical aesthetics', 'expressive aesthetics', and 'usability' 'Classical aesthetics' and 'expressive aesthetics' can be described by visual aesthetic design, 'Visual aesthetic design' can be distinguished from 'usability'. This conceptual confusion relating to 'usability' and 'visual aesthetic design' can be clarified by these findings. (2) As a result of multiple regression analyses, 'classical aesthetics', 'expressive aesthetics', and 'usability' have a positive influence on 'interactivity' and 'web site evaluation'. This research clarifies the concepts of 'expectations' of Grier  and 'engagement' of Rosen and Purinton  as the 'interactivity' between users and web sites. Furthermore, this research suggests a valid model with high
(interactivity, 48% : web site evaluation, 68%). (3) Empirical tests show that the differences among users in 'entry point' are related to the characteristics of web sites and the personal characteristics of users. The differences among users in terms of 'scanning time' are closely related to the attitudes and evaluation tendencies of users with respect to web sites. These findings could contribute to the 'search phase' of the Faraday model , enabling it to be more precise and extensible. The managerial implication of this study is that customers' preferences regarding web site designs are differences, as their preferences are based on their individual characteristics. Therefore, marketing managers should consider promotional tools on web sites that are relevant to the target market. An optimal strategy for web design could be a carefully-selected combination of factors that are relevant to the 'interactivity' and 'evaluation' of web sites. Additionally, if marketing managers want to attract more favorable attitudes and more affirmative evaluations from users, web sites should be designed so that they are understood more quickly by users. finally, this study suggests that 'good design' for web sites depends on understanding how to attain the appropriate balance between 'classical aesthetics' and 'expressive aesthetics', based on the target customer.
The Effect of 'Process' Factor and 'Infra' Factor in Quality Management on Manufacturing Capabilities and Performance
Chang, Deok-Shin ; Kim, Soo-Wook ; Park, Jeong-Soo ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 41~51
We categorize quality management practices as two factors ; 'infra factor' and 'process factor.' We confirm the factors' statistical significance with empirical investigation about 167 manufacturing companies in nationwide. Moreover, we find the two factors affect positively on the manufacturing capabilities of differentiation and reliability, and on the performances as improving products and process. We prove these results with empirical method of structural equation model and AMOS program.
Analyzing the Relationships among Intention to Use, Satisfaction, Trust, and Perceived Effectiveness of Review Boards as Online Feedback Mechanism in Shopping Websites
Kim, Seung-Woon ; Kang, Hee-Taek ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 53~69
Internet shopping websites have offered comfort to consumers in shopping and built trust relationships with them by providing electronic agents for recommendation, escrow services, and customer centers etc. But as there is little big difference among the shopping websites in terms of technical competence, website design, operational policy, they recognize online feedback (reviews or recommendation of consumers or experts) and online feedback mechanism as important marketing tools. Based on online feedback related studies, this study explores antecedents (consensus, vividness of reviews, interactions in review boards) of the perceived effectiveness of review boards which are text-based feedback mechanisms and its consequences such as trust, satisfaction, and intention to use. The results show that the perceived effectiveness of review boards is significantly affected by vividness of reviews and interactions in review boards, and the impact of interaction in review boards on the perceived effectiveness of review boards is stronger than that of vividness of reviews. The results also show that the perceived effectiveness of review boards has a significant influence on trust and satisfaction with the shopping websites, and intention to use is influenced by both trust and satisfaction.
Mobile IS Success in Mandatory Usage Context : The Role of Compatibility with Work
Kim, Yong-Young ; Ahn, Joong-Ho ; Yang, Hee-Dong ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 71~88
This study investigates the factors that influence the user's (postal workers') satisfaction with using PDAs in the Korea Postal Services. This study is concerned about the success of IS when employees are mandated to use IS to increase their productivity. The factors examined in this study include independent variables (information quality and system quality), dependent variables (perceived usefulness and user satisfaction), and mediator (compatibility with work). All these factors were found significant for causal relations. We especially notice the role of compatibility with work as full mediator.
Algorithms for Maximum Integer Multiflow and Multicut in a Ring Network
Myung, Young-Soo ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 89~97
We study the maximum integer multiflow problem and the minimum multicut problem in a ring network. Both problems in a general network are known to be NP-hard. In this paper, we develop polynomial time algorithms to solve the problems. We also prove that even In a ring network, maximum multiflow is not always integral, which implies that the amount of maximum integer flow does not always reach the minimum capacity of multicut.
Robust EOQ Models with Decreasing Cost Functions
Lim, Sung-Mook ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 99~107
We consider (worst-case) robust optimization versions of the Economic Order Quantity (EOQ) model with decreasing cost functions. Two variants of the EOQ model are discussed, in which the purchasing costs are decreasing power functions in either the order quantity or demand rate. We develop the corresponding worst-case robust optimization models of the two variants, where the parameters in the purchasing cost function of each model are uncertain but known to lie in an ellipsoid. For the robust EOQ model with the purchasing cost being a decreasing function of the demand rate, we derive the analytical optimal solution. For the robust EOQ model with the purchasing cost being a decreasing function of the order quantity, we prove that it is a convex optimization problem, and thus lends itself to efficient numerical algorithms.
On a New Evolutionary Algorithm for Network Optimization Problems
Soak, Sang-Moon ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 109~121
This paper focuses on algorithms based on the evolution, which is applied to various optimization problems. Especially, among these algorithms based on the evolution, we investigate the simple genetic algorithm based on Darwin's evolution, the Lamarckian algorithm based on Lamark's evolution and the Baldwin algorithm based on the Baldwin effect and also Investigate the difference among them in the biological and engineering aspects. Finally, through this comparison, we suggest a new algorithm to find more various solutions changing the genotype or phenotype search space and show the performance of the proposed method. Conclusively, the proposed method showed superior performance to the previous method which was applied to the constrained minimum spanning tree problem and known as the best algorithm.
The Weights Analysis of Evaluation Areas and Items for the Informatization Program by means of the AHP
Kim, Sang-Hoon ; Choi, Jeom-Ki ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 123~140
This study focuses on establishing theoretically-reasonable framework of evaluation areas and items for the informatization program and analyzing the weights for each area and item by means of the AHP. To obtain the goal of this research, firstly, based on broadly reviewing previous literature and logical reasoning, the evaluation criteria were Identified and conceptualized, which were 3 evaluation phases, 5 evaluation areas, and 22 evaluation items. Secondly, The data used for calculating the weight values for the evaluation criteria were collected from 48 academic and practical experts in the field of the informatization program promotion using internet survey. Thirdly, the relative weights among evaluation phases, evaluation areas, and its items were derived by AHP analysis. The findings of this study are thought not only to be useful as a practical guideline in performing evaluating the informatization program but also to provide significant basis for constructing the theoretical framework of evaluating method and management of the informatization program.
Busy Period Analysis for the GI/M/1 Queue with Working Vacations
Chae, Kyung-Chul ; Lim, Dae-Eun ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 141~147
We consider a GI/M/1 queue with vacations such that the server works with different rate rather than completely stops working during a vacation period. We derive the transform of the joint distribution of the length of a busy period, the number of customers served during the busy period, and the length of the subsequent idle period.
An Empirical Approach to the Influence of IT Assets Security and Information Security Service on Information Security Qualify and Satisfaction
Kwon, Soon-Jae ; Lee, Kun-Chang ; Kim, Chang-Hyun ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 149~162
In the era of the internet and ubiquitous computing, IS users are still facing a variety of threats. Therefore, a need of more tightened information security service increases unprecedentedly. In this sense, this study is aimed at proposing a new research model in which IT assets (i.e., network, system, and information influence) Security and Information Security Service (i.e., confidentiality, integrity, nonrepudiation, authentication) affect information security quality positively, leading to users' satisfaction eventually. To prove the validity of the proposed research model, PLS analysis is applied with valid 177 questionnaires. Results reveal that both IT assets Security and Information Security Service influence informations security qualify positively, and user satisfaction as well. From the results, it can be concluded that Korean government's recent orchestrated efforts to boost the IT assets Security and Information Security Service helped great improve the information security quality and user satisfaction.
A Evaluation System Integrating Cost-Cross Effects of Big Scale R&D Projects
Kwon, Cheol-Shin ; Lee, Soon-Cheon ; Park, Jooh-Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 32, issue 2, 2007, Pages 163~175
has been wifely used to evaluate economic efficiency of R&D projects, but most of cost-effectiveness evaluation systems have some problems such as systematic method for setting and evaluating cost factors, estimation of single effect on each R&D project, and estimation of cross effects among R&D projects. To solve these problems, we have designed a new evaluation indicator called a
Cost-Cross Effect Integration Indicator
including cross effects developed in this research. The major research findings are summarized as follows : (1)
Coist Estimation Model
, which estimates the cost factors divided into two classes of assembly product and system product and then integrates the total cost values, has been designed. (2) A new method for estimating parameters of cross effects among R&D projects has been developed. (3)
Cross Effects Estimation Model
to estimate multi-effects and cross effects by completion time among several projects has been designed. (4)
Integration Estimation Indicator
for setting priority on a project group has been extracted by combination of total cost value and total effect value.