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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 39, Issue 4 - Nov 2014
Volume 39, Issue 3 - Sep 2014
Volume 39, Issue 2 - Jun 2014
Volume 39, Issue 1 - Mar 2014
Selecting the target year
A Note on the M/G/1/K Queue with Two-Threshold Hysteresis Strategy of Service Intensity Switching
Choi, Doo Il ; Kim, Bo Keun ; Lee, Doo Ho ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 1~5
DOI : 10.7737/JKORMS.2014.39.3.001
We study the paper Zhernovyi and Zhernovyi [Zhernovyi, K.Y. and Y.V. Zhernovyi, "An
system with two-threshold hysteresis strategy of service intensity switching," Journal of Communications and Electronics, Vol.12, No.2(2012), pp.127-140]. In the paper, authors used the Korolyuk potential method to obtain the stationary queue length distribution. Instead, our note makes an attempt to apply the most frequently used methods : the embedded Markov chain and the supplementary variable method. We derive the queue length distribution at a customer's departure epoch and then at an arbitrary epoch.
An Extension of SWCL to Represent Logical Implication Knowledge under Semantic Web Environment
Kim, Hak-Jin ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 7~22
DOI : 10.7737/JKORMS.2014.39.3.007
By the publications of RDF and OWL, the Semantic Web is confirmed as a technology through which information in the Internet can be processed by machines. The focus of the Semantic Web study after then has moved to how to provide more useful information to users for their decision making beyond simple use of the structured data in ontologies. SWRL that makes logical inference possible by rules, and SWCL that formulates constraints under the Semantic Web environment are some of many efforts toward the achievement of that goal. Constraint represents a connection or a relationship between individual data in ontology. Based on SWCL, this paper tries to extend the language by adding one more type of constraint, implication constaint, in its repertoire. When users use binary variables to represent logical relationships in mathematical models, it requires and knowledge on the solver to solve the models. The use of implication constraint ease this difficulty. Its need, definition and relevant technical description is presented by the use of the optimal common attribute selection problem in product design.
Measuring Operational Efficiency of Korean Online Game Companies with DEA Window Analysis
Chun, Hoon ; Lee, Hakyeon ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 23~40
DOI : 10.7737/JKORMS.2014.39.3.023
This paper measures the operational efficiency of domestic online game companies and analyze its trends and patterns by using data envelopment analysis (DEA). DEA is a non-parametric approach to measuring the relative efficiency of decision-making units (DMUs) with multiple inputs and outputs. 14 online game companies are selected as DMUs and three inputs (number of employees, capital and asset) and three outputs (sales, operating profit and net profit) are selected as DEA variables. First, the output-oriented BCC model and super-efficiency model are employed to measure the static operational efficiency of the online game companies from 2003 to 2012. We also conduct the dynamic analysis with DEA window model to capture the trends of their operational efficiency influenced by internal and external environmental changes. The results are expected to provide fruitful implications for strategic decision making of online game companies and policy making for the online game industry.
The Analysis of Government Financial Subsidies for the Electric Car Market
Kim, Kihoon ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 41~49
DOI : 10.7737/JKORMS.2014.39.3.041
Several developed countries have recently provided electric vehicle consumers and producers with financial subsidies. There has been some empirical research on the impact of government subsidies on the consumers' purchase of electric cars. However, little analytical research on the government subsidies for the electric car market exists. This research analyzes the impact of the government financial subsidies on the electric car price and technology level as well as the consumers' adoption of electric cars. This research also suggests that the government should subsidize only the electric car market to further improve the electric car technology.
A Study on Developing a CER Using Production Cost Data in Korean Maneuver Weapon System
Lee, Doo-Hyun ; Kim, Gak-Gyu ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 51~61
DOI : 10.7737/JKORMS.2014.39.3.051
In this paper, we deal with developing a cost estimation relationships (CER) for Korean maneuverable weapons systems using historical production cost. To develop the CER, we collected the historical data of the production cost of four tanks and five armored vehicles. We also analyzed the Required Operational Capability (ROC) of the weapons systems and chose cost drivers that can compare operational capabilities of the weapons systems We used Forward selection, Backward selection, Stepwise Regression and
selection as the cost drivers which have the greatest influence with the dependent variables. And we used Principle Component Regression, Robust Regression and Weighted Regression to deal with multicollinearity and outlier among the data to develop a more appropriate CER. As a result, we were able to develop a production cost CER for Korean maneuverable weapons systems that have the lowest cost errors. Thus, this research is meaningful in terms of developing a CER based on Korean original cost data without foreign data and these methods will contribute to developing a Korean cost analysis program in the future.
The Redemption Behavior of Loyalty Points and Customer Lifetime Value
Park, Dae-Yun ; Yoo, Shijin ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 63~82
DOI : 10.7737/JKORMS.2014.39.3.063
The main objective of this research is to investigate whether the RFM (recency-frequency-monetary value) information of a customer's redemption behavior of loyalty points can improve the prediction of future value of the customer. The conventional measurement of customer value has been primarily based on purchase transactions behavior although a customer's future behavior can be also influenced by other interactions between the customer and the firm such as redemption of rewards in a loyalty program. We theorize why a customer's redemption behavior can influence her future purchases and thereby the customer's total value based on operant learning theory, goal gradient hypothesis, and lock-in effect. Using a dataset from a major book store in Korea spanning three years between 2008 and 2010, we analyze both purchase transactions and redemption records of over 10,000 customers. The results show that the redemption-based RFM information does improve the prediction accuracy of the customer's future purchases. Based on this result, we also propose an improved estimate of customer lifetime value (CLV) by combining purchase transactions and loyalty points redemption data. Managerial implications will be also discussed for firms managing loyalty programs to maximize the total value customers.
Parallel Machine Scheduling with Identical Jobs and Sequence-Independent Setup Times
Choi, Byung-Cheon ; Park, Myoung-Ju ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 83~91
DOI : 10.7737/JKORMS.2014.39.3.083
We consider the problem of scheduling identical jobs with sequence-independent setup times on parallel machines. The objective is to minimize total completion times. We present the pseudopolynomial-time algorithm for the case with a fixed number of machines and an efficient approximation algorithm for our problem with identical setup times, which is known to be NP-hard even for the two-machine case.
Collaboration Management Strategies and Product Development Performance
Hong, Yunsook ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 93~115
DOI : 10.7737/JKORMS.2014.39.3.093
In collaborative product development with multiple suppliers, buyers must manage the suppliers' activities. This empirical research investigates the performance impacts of three strategies that buyers use to manage suppliers who design interdependent components. These strategies are: Instructionism (giving clear instructions to suppliers), Teaming (forming an interactive development team with suppliers), and Delegation (transferring component development responsibilities to suppliers). Data were collected through a cross-industry web-based survey of buying firms in manufacturing industries whose products require multiple, interdependent components. A path analysis utilizing 318 survey responses indicates that Instructionism has a positive effect on design quality, and Teaming has a positive effect on design quality and component innovation. The use of Delegation is not related to any of the performance indicators. The practical implication of this research for product development managers is that both Instructionism and Teaming can be effective strategies. For the purpose of assuring design quality, a buyer should give clear instructions in detailed specifications or work closely with suppliers in development teams. If competitive priority is product innovativeness, however, the buyer should work closely with its suppliers during component development processes using a Teaming strategy.
Internal Marketing Approach to Internal Satisfaction, Loyalty and Organization Performance : Using Logistics Regression
Son, Hee-Young ; Kang, Man-Su ; Park, Sang-Kyu ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 117~131
DOI : 10.7737/JKORMS.2014.39.3.117
As interests in the management of government-owned corporation rise, in these days, debt reduction and normalization of management of those companies have been proceeding under the lead of government. At this point, it is very important to seek internal marketing method for improvement of internal employees' satisfaction, loyalty and organization performance. This study analyzes impact of factors of internal marketing effect on organization satisfaction, loyalty and organization performance in the context of the domestic public companies, the Korea Electric Power Corporation (KEPCO) and the Korea Water Resources Corporation (K-WATER)'s employees empirically. There are some significant differences between the two publics. It is proved that delegation of the authority influences on internal satisfaction and organization performance in the case of KEPCO, and education and training influence on internal satisfaction and organization performance in the case of K-WATER. On the other hand, in the case of K-WATER, any internal marketing factors don't influence on loyalty. The results of this study show somewhat different characteristics depending on the characteristics of firm, however, it is expected that this study can be very useful in regards to similar public enterprises or businesses.
Analysis of the Optimal Degree of Search Result Modification
Woo, Soohan ; Lee, Eun Hee ; Kim, Kihoon ;
Journal of the Korean Operations Research and Management Science Society, volume 39, issue 3, 2014, Pages 133~144
DOI : 10.7737/JKORMS.2014.39.3.133
Naver, a leading search engine in South Korea, may show modified and reorganized search results for some trendy and popular keywords; when popular words such as the titles of soap operas and films are searched for,all the detailed and well-organized information regarding them can be presented. By recognizing that search engines may modify and reorganize search results for some popular keywords, we mathematically model the impact of the degree of modification of search results on the search engine's profit to derive its optimal modification degree. We show how the optimal degree of search result modification may change according to the different shapes of the search engine's advertising revenue function.