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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Management Science Review
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Journal DOI :
The Korean Operations and Management Science Society
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Volume & Issues
Volume 26, Issue 3 - Nov 2009
Volume 26, Issue 2 - Jul 2009
Volume 26, Issue 1 - Mar 2009
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Multi-ring Design Algorithm for Survivable WDM Networks
Chung, Ji-Bok ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 1~9
In this paper, we present mathematical models for the ring covering problems arising in the design of multi-ring WDM networks. Also, we present efficient algorithms to solve the suggested models. By the computational experiment, our model can solve the medium-sized networks efficiently and shows better performance than the existing heuristic method. Although we propose an efficient method for the column generation procedure, branching rule that does not destroy the column generation structure is unsolved. Further research is required to develop an effective branching rule.
Cultivation Marketing and Effect Measurement for Improving Sale and Retention of Additional Service Product of A Mobile Telephone Company
Chun, Heui-Ju ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 11~21
In this paper, we proposed some valuable analysis results of cultivation campaign marketing in A mobile telephone company. The cultivation campaign marketing is a new outbound TM campaign strategy composed of 4 steps for new subscribers. During the analyses, attrition rate of A mobile company, outbound TM rejection rate, contact rate/call success rate and additional service attrition rate after subscription are measured as an effect of cultivation campaign. The results showed that there were no statistical significance in improving retention rate between customers experienced 4 step cultivation campaign and control group. However, the cultivation campaign had a better effect on improving response rate and success of selling additional service product of mobile company compared to general selling campaign. This is because cultivation campaign group had been taking care of from subscription time. It is suggested that cultivation campaign had better confined customers more likely to buy additional service to outbound TM for the sake of financial efficiency.
Optimization Model for Location Management in WCDMA Networks
Chung, Yong-Joo ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 23~35
This study deals with the location management in WCDMA (Wideband Code Division Multiple Access) networks. The new location management method is the one of the many techniques used to provide the packet switched (PS) services effectively in WCDMA networks. WCDMA introduces RA (routing area) for the PS services in addition to LA (location area) for the circuit switched (CS) services. WCDMA system also adopts the cooperative paging and the combined area update which are to decrease signaling traffic using the PS network resources for the CS services. Considering the characteristics of the WCDMA networks, this study formulate into the mathematical programming problem for the location management. Rather than the existing researches which consider the single MSC/SGSN networks, we deal with the multi MSC/SGSN networks, where both MSC area and SGSN area should be determined as well. Fairness between traffic loads of MSC/SGSN and the system cost incurred to MSC/SGSN are also incorporated into our model, which make the model more realistic. We propose greedy algorithms for the problems, which consists of the merger of two neighboring areas and the movement of an area. Extensive experiment has been done based on the realistic problem examples. Followed by the analysis of parameter effect on the final solutions and the quality of final solutions obtained by our greedy algorithms. Our proposed model and analysis result can be used to determine WCDMA system areas and to predict the system performance measures by the determination.
Case Study: e-Learning for Management Sciences Course
Um, Myoung-Yong ; Kim, Tae-Ung ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 37~54
E-learning is a networked phenomenon allowing for instant revisions and distribution, and goes beyond training and instruction to the delivery of information and tools to improve performance. The proponents of e-learning emphasizes that students learn more effectively when they interact and are involved with other students participating in similar endeavors. The paper outlines the process of development and design of e-learning based Management Sciences course, with the aim of ensuring widespread use, in undergraduate business program. Experiences in introducing students to e-learning course are reported. Feedback from students has been very positive but also indicates the need for ongoing support and direction. In addition, a survey was used to identify the determinants of students' academic performance of Management Science, and PLS based model is developed to analyze the results. Statistical results concerning the hypothesized model are provided.
Clustering Optimal Design in Wireless Sensor Network using Ant Colony Optimization
Kim, Sung-Soo ; Choi, Seung-Hyeon ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 55~65
The objective of this paper is to propose an ant colony optimization (ACO) for clustering design in wireless sensor network problem. This proposed ACO approach is designed to deal with the dynamics of the sensor nodes which can be adaptable to topological changes to any network graph in a time. Long communication distances between sensors and a sink in a sensor network can greatly consume the energy of sensors and reduce the lifetime of a network. We can greatly minimize the total communication distance while minimizing the number of cluster heads using proposed ACO. Simulation results show that our proposed method is very efficient to find the best solutions comparing to the optimal solution using CPLEX in 100, 200, and 400 node sensor networks.
Price Competition in Horizontal and Vertical Differentiation : Focusing on the WiBro and HSDPA
Kim, Dow-Han ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 67~78
In this paper, I analyze the mobile broadband services market characterized by vertical and horizontal differentiation. Vertical differentiation as service quality differentiation is based on the transmission speed of mobile internet service and horizontal differentiation as spatial differentiation is based on the service coverage. Theoretical explanations for the competitive price policy have been developed in the game context of WiBro which represent the high quality within the limited service coverage and HSDPA which represent relatively low quality with nation-wide service. When the WiBro has a mobile broadband service quality advantage and the difference in quality is sufficiently low, the price of WiBro with limited service coverage is relatively lower than that of HSDPA. This occurs because the advantage of WiBro's vertical service differentiation is offset by the disadvantage of horizontal differentiation. The difference in the quality of mobile internet service, however, is not too high, the price of WiBro is relatively higher than that of HSDPA. Moreover, when the service quality of WiBro is sufficiently high, the low quality HSDPA service faces no demand.
Post-Adoption Behavior : Role of Customer Satisfaction and Customer Loyalty in the Next-Generation Service Upgrading
Son, Min-Hee ; Han, Kye-Sook ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 79~100
Recently, most tech-based products are of multiple generations, since new-generation products are replacing the older ones as technologies continue to improve. Although, this means that research is needed to examine as much about the role of post-adoption behavior as the missing link between the adoptions of successive generation as first adoption of innovation, there is a dearth of literature explicitly examining consumers' post-adoption behavior, especially in the context of subscription-based service. For the subscription-based services, in spite of the important role of consumer satisfaction, research on the post-adoption behavior can not carefully examine the direct impact of consumer satisfaction on their decision to upgrade by considering usage instead of satisfaction as the missing link between buyers' first adoption and their next-generation adoption. This study identified two types of attribute satisfaction such as basic attribute and core attribute using both literature review and FGI (Focus Group Interview), and tries to investigate how two types of attribute satisfaction has influence on customers' intention to upgrade to the next-generation services. and a moderating role of customer loyalty between attribute satisfaction and intention. The empirical results show that core-attribute satisfaction has a negative influence on customers' intention to upgrade, due to the moderating role of customer loyalty, but it can raise their intention to upgrade next-generation services. However, basic-attribute satisfaction, on the other hand, appears to positively influence both customer loyalty and the intention to upgrade. We also find that the consumer attribute satisfaction is influenced by consumer innovativeness, her perception of service and the usage of each features' type in different ways. Finally, academic and practical implication is made, limitation is clarified and a direction for further studies is suggested.
A Technology Mining Framework in Developing New Wireless
Lee, Young-Ho ; Shim, Hyun-Dong ; Kim, Young-Wook ; Byun, Jae-Wan ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 101~115
In this paper, we propose a technology mining framework for mobile communication industry. We develop a two phase approach of new technology identification and service enhancement. The new technology identification process consists of R&D issues analysis, technology theme design, and emerging technology sampling. On the other hand, existing service enhancement process has technology landscaping, keyword based search, and technological growth analysis. By implementing these two phase frameworks, we develop a technology portfolio for mobile communication industry.
Seat Allocation Model for Single Flight-leg using Linear Approximation Technique
Song, Yoon-Sook ; Lee, Hwi-Young ; Yoon, Moon-Gil ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 117~131
Over the last three decades, there are many researches focusing on the practice and theory of RM in airlines. Most of them have dealt with a seat assignment problem for maximizing the total revenue. In this study, we focus on a seat assignment problem in airlines. The seat assignment problem can be modeled as a stochastic programming model which is difficulty to solve optimally. However, with some assumptions on the demand distribution functions and a linear approximation technique, we can transform the complex stochastic programming model to a Linear Programming model. Some computational experiments are performed to evaluate out model with randomly generated data. They show that our model has a good performance comparing to existing models, and can be considered as a basis for further studies on improving existing seat assignment models.
The Differences between Patients and Guardians in the Impacts of Service Quality Factors on Overall Satisfaction of Medical Treatment Service
Park, Sang-June ; Jin, Cheon-Moon ; Kim, Eun-Jeong ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 133~144
In this study, we investigated the effects of service quality factors on overall satisfaction of medical treatment service. Especially, we focused on the differences between patients and guardians in impact of service quality factors. The data was gathered by using a structured questionnaire from 220 patients and 220 guardians. Based the factor analyses, we derived the five factors of medical service quality-process, speciality, kindness, convenience of facilities, and cleanness. Then, we examined the effects of the five service quality factors on guardians' satisfaction as well as on patients' satisfaction. The results of the empirical study showed that the kindness is more important to patients than to guardians whereas the speciality is more important to guardians than to patients.
The Optimal Spare Level of a Weapon System having Phase-type Repair Time
Yoon, Hyouk ; Lee, Sang-Jin ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 145~156
The probability distribution of the repair process should be determined to choose the optimal spare level of a weapon system with a queueing model. Though most weapon systems have a multi-step repair process, previous studies use the exponential distribution for the multi-step repair process. But the PH distribution is more appropriate for this case. We utilize the PH distribution on a queueing model and solve it with MGM(Matrix Geometric Method). We derive the optimal spare level using the PH distribution and show the difference of results between the PH and exponential distribution.
Calculation TRL using Integration Readiness Between Technologies for Supporting Technology-transition of Defense Technologies to the Defense Weapons System
Bae, Yoon-Ho ; Choi, Seok-Cheol ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 157~167
Technology transition from defense technology to weapon system is an important process for defense acquisition program. Many countries such as USA, UK, Australia and Republic of Korea use technology readiness level (TRL) as a tool for technology transition by identifying critical technology elements (CTEs) and assessing the technology maturity. In this paper we review a transition process for the defense acquisition. Then we suggest a method to evaluate system's TRL using each component TRL and integration readiness level (IRL) between each technologies. We apply the method to an ACTD project. A result show that technology maturity is influenced by integration between technologies.
A Study on Antecedents of Customer Switching Behavior in Mobile Services
Yoon, Jung-In ; Sung, Su-Jung ; Lee, Jung-Woo ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 169~184
Recently, mobile telecommunication businesses contend with each other to expand their customer base by using aggressive marketing strategies. In order to determine if there strategies are effective, customer's switching behavior needs to be studied. This study identifies and analyzes direct, indirect factors that may customer switching behavior : attractiveness of alternatives, network externality, and switching cost. Results reveals that attractiveness of alternatives, network externalities have a direct impact on customer switching behavior. These two factors also have moderating effects on customer switching behavior but the switching cost does not In short, network externalities and alternatives strategically determine the success of 3.5G service. In this regard, mobile business should improve their own attractiveness of alternatives by developing specialized service in 3.5G service.
A Study on the Effects of Technology Acceptance and Economic Factors on the Loyalty of Power Bloggers
Hong, Jin-Young ; Park, Sun-Ju ; Chung, Seung-Wha ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 185~204
Power bloggers have become one of the most important resources of blog service companies, and only those who attract and secure power bloggers will be able to have competitive edge and profitability in blog related businesses. This study examines the effects of technology acceptance factors and economical factors on the loyalty of power bloggers. The analysis results show that the usefulness, power of social influence and enjoyment positively affect the attitude and intention to continuous use. The relationship between the attitude and intention to continuous use is demonstrated as significant. The economical benefit exhibits weakly positive influence on the attitude to blogging, but not on the intention. This indicates that although many power bloggers receive economic benefits through their blogging activities, such economical benefits do not have big impact on their activities and the intention to use. The blog service providers may use the analysis results when developing new blog services. In particular, the usefulness, which is often considered as one of the most important factors in the success of the blogosphere, is found to have less impact than the enjoyment among power bioggers. This is because blog users, especially power bloggers, use the blog not for a specific purpose or for generating a special product; most of them use the blog to satisfy their own personal desires. When developing blog services, therefore, it is important to cater to the users' enjoyment and their psychological compensation. What is surprising is that the effect of the economical factor is not ad significant as one might have expected. This implies that the new blog services that provide profit sharing or advertising revenue sharing may not be as successful as one would have hoped for in maintaining the loyalty of power bloggers.
An Analysis on the Factors Affecting Perception, Adoption, and Implementation of RFID Technology
Park, Yong-Jae ; Rim, Myung-Hwan ;
Korean Management Science Review, volume 26, issue 3, 2009, Pages 205~221
Countries around the world are actively investing in development and industrial application of RFID, a new wireless communications technology widely perceived as a next-generation growth engine with the potential for creation of new business value. In this paper, we empirically study factors influencing the acceptance of RFID by stage of introduction, to contribute making policies aimed at stimulating demand for this technology and accelerating its penetration. The process of acceptance of RFID was divided, in this paper, into three stages: perception, adoption and implementation, and influence factors, both Internal and external to an organization, drawn from existing literature, are analyzed. A conceptual model comprising internal influence factors, including technical, organization and economic factors, and external factors related to environment and this model was tested through structural equation analysis. To obtain data for empirical analysis, we surveyed public institutions and general companies that are potential users of RFID. The data thus collected were analyzed to determine factors influencing the acceptance of RFID by stage, and practical implications for the RFID promotion policy at the level of demand creation and industrial application were derived from the results of this analysis.