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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 40, Issue 4 - Nov 2015
Volume 40, Issue 3 - Aug 2015
Volume 40, Issue 2 - May 2015
Volume 40, Issue 1 - Feb 2015
Selecting the target year
A Heuristic Derivation of the Waiting Time Distribution of a GI/G/1 Queue
Lim, Dae Eun ; Kim, Bokeun ; Kim, Nam K. ; Chae, Kyung C. ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 1~4
DOI : 10.7737/JKORMS.2015.40.1.001
This paper presents a heuristic approach to derive the Laplace-Stieltjes transform (LST) and the probability generating function (PGF) of the waiting time distributions of a continuous- and a discrete-time GI/G/1 queue, respectively. This is a new idea to derive the well-known results, the waiting time distribution of GI/G/1 queue, in a different way.
Dynamic Model for Open Innovation Network
Park, Chulsoon ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 5~19
DOI : 10.7737/JKORMS.2015.40.1.005
Literatures on open innovation have two major limitations. First, either on a firm level or on an industry level did they analyze the open innovation issues. The results of a firm`s innovation can be diffused through the whole network and the firm can learn back from the network knowledge. Prior literatures did not consider the feedback loop among firms and network in which the firms are involved. Second, most open innovation research had a static perspective on firm`s innovation performance. Since the diffusion, spill-over and learning among network members are involved over time, the open innovation is intrinsically dynamic. From the dynamic perspective, we can appreciate the fundamental attributes of the open innovation network which involves diverse firms, research institutes, and universities. In order to overcome the limitations, we suggest a dynamic model for open innovation network. We build an agent-based model which consists of heterogeneous firms. The firms are connected through a scale-free network which is formed by preferential attachment. Through the diverse scenario of simulation, we collect massive data on the firm level and analyze them both on firm and industry level. From the analysis, we found that, on industry level, the overall performance of open innovation increases as the internal research capability, absorptive capacity, and learning curve coefficient increase. Noticeably, as the deprecation rate of knowledge increases, the variability of knowledge increases. From the firm level analysis, we found that the industry-level variables had a significant effect on the firm`s innovation performance lasting through all the time, whereas the firm-level variables had only on the early phase of innovation.
The Analysis of Carbon Emission Costs under Milk Run Logistics Strategy
Min, Daiki ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 21~33
DOI : 10.7737/JKORMS.2015.40.1.021
This paper develops an analytic model for minimizing the cost of distributing items by truck from one supplier to many customers under Milk run logistics strategy. The model derives formulas for not only inventory and transportation costs but also costs associated with carbon emission trading scheme. In addition, monetary investment for reducing carbon emissions is considered. We analyze how to determine optimal shipment size and carbon emission reduction investment. The purpose of this work is to evaluate the effects of carbon emission trading scheme on the Milk run logistics strategy in terms of how much to reduce carbon emissions and/or inventory and transportation costs. We analytically show that it is possible to reduce carbon emissions while reducing inventory and transportation costs by introducing cap-and-trade carbon emission trading scheme under certain conditions.
Effects of Location Based Coupon Through Smart Phone
Joo, Young-Jin ; Ji, Min-Seong ; Lim, Jong-Hyeok ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 35~55
DOI : 10.7737/JKORMS.2015.40.1.035
In this research, we analyze the effects of price discounts and scarcity message (both quantity limitation message and time limitation message) on the purchase intention in the smart-phone environment. The purchase intention becomes higher at high discount rate and with scarcity message (both quantity limitation message and time limitation message). We also analyze the moderating effects of consumer`s shopping value and distance between the consumer and the store on the effects of price discounts and scarcity message (both quantity limitation message and time limitation message) on the purchase intention. On average, the effects of price discount, time limitation message and quantity limitation message on the purchase intention become the highest levels for consumers pursuing hedonic shopping value. The effects of price discount, time limitation message and quantity limitation message on the purchase intention become higher when they are offered within a short distance between the coupon provider and the target customer.
An Empirical Analysis of the Effect of Operations Performance on Financial Performance
Kim, Younghoon ; Pyun, Jebum ; Kim, DaeSoo ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 57~73
DOI : 10.7737/JKORMS.2015.40.1.057
While many previous studies investigated the effect of operations performance on financial performance, most studies considered only a few performance indicators and ignored the characteristics of industries. Therefore, this study intends to analyze the effect of operations performance on financial performance, by selecting a rather comprehensive operations performance indicators from firms` financial data. In doing so, we used operating efficiency and supply chain performance indicators for operations performance and a firm`s profitability and future value indicators for financial performance. For the analysis, we collected 544 firms` operations and financial performance data belonging to eight key industries from the `Forbes Global 2000`. We first analysed the differences in operations and financial performance among high, medium and low supply chain performance groups based on the quantitative criteria of Gartner`s `Supply Chain Top 25` ranking procedure. Then we analysed the effect of operations performance indicators on financial performance for both entire industry and individual industries, using multiple regression. Based on the results, we provided practical insights into key operations performance indicators to focus on and manage in order to improve financial performance.
Efficiency Rating by Types of Public Institutions and Identification of Inefficiency Sources
Kim, Hyun Jung ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 75~89
DOI : 10.7737/JKORMS.2015.40.1.075
In recent years, attention to the high debt ratio in public institutions has pushed the government to make efforts in reducing the debt ratio. However, in order to stimulate the economy, the government needs drastically innovative measures that reduce debt by improving efficiency rather than moderate approaches that focus solely on debt reduction. Despite this need, no study has yet systematically analyzed the overall efficiency of domestic public institutions and identified the source of inefficiencies in each public entity. Therefore, largely two research questions are examined. First, this study compares the efficiency levels by types of public institutions. Second, this study identifies the cause of inefficiencies in each public institution and proposes directions for improving efficiency. Based on a 5-year data of 302 public institutions published in public business information systems and organizational websites from 2009 to 2013, Data Envelopment Analysis (DEA) was performed. The input variables include the number of employees and total costs while the output variables include sales and net income. Reflecting the characteristics of public institutions, the input-oriented CCR model and input-oriented BCC model were utilized. Analysis results are as follows. First, market-oriented public institutions showed the highest efficiency while fund management quasi-governmental agencies showed the highest inefficiency. Second, scale efficiency score was measured by applying the CCR model and the BCC model on the organizations with the lowest efficiency level, fund management quasi-governmental agencies. Based on these analysis results, the source of inefficiency and detailed directions for improvement were proposed for Decision Making Units (DMUs) with low CCR and BCC scores.
A Study on Eco-Efficiency in Public Sector Using Decision Tree and DEA Analysis
Lim, Mi Sun ; Kim, Jinhwa ; Choi, Soon Jae ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 91~116
DOI : 10.7737/JKORMS.2015.40.1.091
This study aims to provide public sectors with eco-efficiency information. To implement the purposes of the study, environmental and economic variables of Eco-Efficiency were identified through decision tree model, then the relative Eco-Efficiencies of 243 public sectors were evaluated through input-oriented DEA (Data Envelopment Analysis) model. Specifically, the amount of public purchasing per a staff and the amount of energy use per a staff were considered as input factors. Sales per a staff was considered as output factor. The result shows that most of the public sectors (94.2%) were evaluated as "inefficient" taking into consideration of average value, 0.501 from market-based public corporations, 0.288 from local public corporations, 0.28 from quasi-market-based public corporations, 0.269 from fund-management-based quasi-governmental institutions, 0.09 from non-classified public institutions, and 0.078 from commissioned-service-based quasi-governmental institutions. Furthermore, it is possible to establish a plan for internal Eco-Efficiency improvement based on information of the reference set. In order to improve the Eco-Efficiency in the public sectors in the long term, environmental impacts of the overall public sectors` operations (e.g., energy saving, water saving, waste reduction, and purchasing of green products) needs to be properly proposed in consideration of BSC (Balanced Scorecard) indicators of public sectors.
Efficiency Analysis of Public Service Organizations Using Stochastic Frontier Analysis
Shin, Jong Seop ; Kim, Hyun Jung ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 117~128
DOI : 10.7737/JKORMS.2015.40.1.117
An organization must restructure itself once it makes outsourcing decisions. Outsourcing is a strategy that a company adopts to direct internal efforts into strengthening its core business processes while contracting other companies for strategically less critical tasks thereby improving organizational production efficiency, and the strategy inevitably involves organizational restructuring. While public service organizations have increasingly embraced outsourcing as well, only a handful of studies analyze the change in efficiency from organizational restructuring. Therefore, this study uses Stochastic Frontier Analysis (SFA) to test whether efficiency improved in Korea Expressway Corporation`s restructured branch offices. Korea Expressway Corporation evaluated and grouped its branches based on road extensions management, traffic volume, the number of snow days, road deterioration, and the number of junctions to differentially allocate its personnel and budget. The extent of efficiency improvement in each group was compared, and results show that inefficiency did not exist in any of the groups. The efficiency index among the three group categories was similar across the board; 9 offices in the A-group with its expanded personnel and budget had an efficiency index of 0.954, 12 offices in the B-group with unchanged personnel and budget conditions had an index of 0.950, and 12 offices in the C-group with reduced personnel and budget had an index of 0.937. SFA facilitates efficiency analyses because it does not require pre-restructuring data. This study is easy to apply in practice and empirically tests efficiency improvement in organizational restructuring based on data collected from all the branch offices in Korea Expressway Corporation.
The Present Condition and Future Directions of Public Organizations
Oh, Jay In ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 129~138
DOI : 10.7737/JKORMS.2015.40.1.129
The problems associated with the excessive compensation of the public organizations in Korea have been presented not only by the press but also by the academic societies, including the management evaluation team of the public organizations, both in Korea and abroad. To analyze whether the compensation is excessive necessitates the empirical study on the present condition of the compensation system of the public organizations. Therefore, the purpose of this paper is to suggest the issues and the future directions of the compensation in the public organizations. The findings from the analysis of the data collected in this research include the expansion of the difference in compensation, the reinforcement of the job and performance-based compensation, the systematization of the model on the base compensation, and the differentiation of the compensation increase based on productivity.
The Research of Difference between Public and Private Section : Sort by Region in China
Kim, Yeonggil ; An, Qinrui ; Kim, Soowook ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 139~154
DOI : 10.7737/JKORMS.2015.40.1.139
This paper uses the Heckman model to evaluate the income difference between the public sector and the private sector based on the CHNS data. The research finds that the difference of the public sector versus the private sector between the west area and the east area is about 10% from 1989 to 2000, the transition of the income difference is smooth, that data has made sharp increase to 32% from 2000 to 2011. Considering the income difference between the west area and the central area, the central area and the east area from 1989 to 1997, the data is about 10~15%, from 2000 to 2011 is rocketing time, the data reaches 20%. This paper is very revealing about the income difference ofthe public sector versus the private sector is increasing year after year, and the economy is developing rapidly but with imbalance among different areas in China. It would provides the reference for adjust the income distribution system in future.
The Effects of CSR(Corporate Social Responsibility) on Corporate Evaluation of the Public Sector
Kang, Yeong Seon ; Lew, Joon Yeol ; Seo, Yu Mi ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 155~170
DOI : 10.7737/JKORMS.2015.40.1.155
This study examines whether CSR (corporate social responsibility) activities of the public sector affect on its corporate evaluation in their perspective of consumers. Both public and private sectors are being encouraged to conduct the CSR activities in the four dimensions of economic, legal, ethical, and philanthropic responsibility. While many previous studies have examined the relationship between CSR and corporate`s business performance, these studies focus on the private companies, not the public sector. In this paper, we offer a consumer-side study about the effect of CSR on the corporate evaluation on the public sector. The purpose of this study is to understand the effect of fit of CSR activity, perceived engagement, and perceived authenticity on the consumer`s corporate evaluation of the public sector. We conducted two quasi-experiments involving 223 respondents using the actual CSR cases of two Korean public sectors. As a result, consumer`s perception of engagement and authenticity about the CSR of public sector affects the corporate evaluation in a positive way. The 3-way interaction effect among fit of CSR activity, perceived engagement, and perceived authenticity was significant in corporate evaluation. To achieve successful CSR of the public sector, the public organizations need to increase the communication with their consumers and to implement the strategic CSR activities which can improve the consumer`s perception of authenticity about CSR.
Development of Self-Diagnosis Methodology Based on Process for Improving the Effectiveness in Public Institutions Service
Kim, Changhee ; Lee, Sanghoon ; Kim, Soowook ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 171~184
DOI : 10.7737/JKORMS.2015.40.1.171
The purpose of this study is to develop the self-diagnosis methodology based on process for improving the effectiveness in public institutions service and to suggest it. For this goal, we would like to select the management methodology which can be easily handled from the viewpoint of working personnel in the public institutions and make it as a process. First, the strategy for the public institutions and the strategic task for practicing it are acquired using BSC (Balanced Score Card) which is now under the active research. At this time, the relative degree of significance is derived using the AHP (Analytic Hierarchy Process) which is conducted for the professionals and management to get the degree of importance in the strategic tasks. The acquired relative degree of significance and the figures related to the performance of each strategic task derived from the subsequent questionnaire are used to get the final highly efficient strategic task through IPA (Importance Performance Analysis). In this study, this process based self diagnosis methodology will be explained in detail using the case of Project A in order to verify the effectiveness of the management science technique on the self diagnosis of the public institutions.
A Study on the Method for Promoting Acceptance on Performance Management : Focusing on the Public Enterprises Practices
Kim, Youn Sung ; Yoo, Hong Sung ; Kim, Sun Cheol ;
Journal of the Korean Operations Research and Management Science Society, volume 40, issue 1, 2015, Pages 185~198
DOI : 10.7737/JKORMS.2015.40.1.185
This study drew performance management factors analyzed a causal link between acceptance and satisfaction of performance management to present the method for promoting acceptance on the performance management system that most of the public enterprises, government-affiliated organizations are implementing. To achieve this, qualitative analysis and quantitative analysis were conducted in parallel through in-depth case studies and surveys. The results of this study are as follows. First, the analysis of the performance management factors with preceding studies shows that performance management indicators, performance management operations and performance management communications. Second, from the causal relationship of performance management factors affecting performance management acceptance reveals that performance management operation has statistical significance. Third, the analysis of the effect of performance management factors on the management satisfaction shows that operation and indicator of the performance management have statistical significance and reflecting the performance indicators to business, adequacy of target level, training, system support and CEO`s Leadership have been revealed as important variables to the management satisfaction. Fourth, the result of the analysis on casual connection between acceptance and satisfaction of the performance management shows that improving management acceptance has a direct impact on satisfaction because performance management receptiveness were deemed statistically significant. Fifth, the result of the in-depth case studies on improving performance management acceptance shows that public enterprises have been putting in an effort to design indicators and try to encourage internal member`s involvement during the monitoring and evaluation. The quantitative analysis based on survey has turned out that performance management operation and performance management indicators have statistical significance. The qualitative analysis by in-depth analysis shows that public enterprises put a lot of effort to performance management indicators and communication between internal members. As a result, commitment to performance management operation is required to improve the performance management acceptance. In other words, a detailed implementation plan for training, information system support, and CEO`s leadership has to be established and ought to be pushed.