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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 29, Issue 3 - Nov 2012
Volume 29, Issue 2 - Jul 2012
Volume 29, Issue 1 - Mar 2012
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TDOA-Based Localization Algorithms for RFID Systems Using Benchmark Tags
Joo, Un Gi ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 1~11
DOI : 10.7737/KMSR.2012.29.3.001
This paper considers a localization problem in time difference of arrival (TDOA)-based radio frequency identification (RFID) systems. To estimate the position of a target tag, this paper suggests three localization algorithms that use benchmark tags. The benchmark tags are the same type as the target tag, but either the locations or distance of the benchmark tags are known. Two algorithms use the benchmarks for auxiliary information to improve the estimation accuracy of the other localization algorithms such as least squared estimator (LSE). The other one utilizes the benchmarks as essential tags to estimate the location. Numerical tests show that the localization accuracy can be improved by using benchmark tags especially when an algorithm using the LSE is applied to the localization problem. Furthermore, this paper shows that our benchmark algorithm is valuable when the measurement noise is large.
Conjoint Analysis on the Academia-Industrial Cooperative Research Project Attributes for Culture Technology Research
Jung, Uk ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 13~21
DOI : 10.7737/KMSR.2012.29.3.013
As culture technology is recognized as the important element of national industry, the necessity of the related policy development for enhancement of culture technology is magnified. In this study, we use conjoint analysis to investigate how the researchers from industry and academia think differently on the importance of several attributes in government-supported culture technology research project such as research period, size of research fund, inter-affiliated research requirement and interdisciplinary research requirement, and preference on those attribute levels. Also, we describes how a simulation experiment is designed to simulate participation shares of four alternative hypothetical research project profiles. This study will help establish the more effective policy of the national research program by understanding the preferential differences between industry and academia on the research project attributes.
The Effect of Capital Market Consolidation Act on the Efficiency of the Korean Financial Industry
Kang, Soo-Min ; Min, Jae H. ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 23~43
DOI : 10.7737/KMSR.2012.29.3.023
Enacted for enhancing the competitiveness of the Korean capital market and financial industry, Capital Market Consolidation Act (CMCA) was intended to induce considerable changes such as adopting the concept of financial investment products, regulating financial investment functionally, extending financial investors' business areas and intensifying protection for investors. Employing DEA (Data Envelopment Analysis), this study measures and compares the efficiencies of domestic financial companies between the before and after the enactment of the Consolidation Act. We categorize the financial companies into 4 groups (banks, life insurance companies, property and casualty insurance companies and securities companies) depending on their business types, and evaluate how much and in which direction the Consolidation Act affects the efficiency of each group respectively. The study shows that there is no significant difference between the average efficiency of banks and that of property and casualty insurance companies due to the trade-off between opportunities and threats of the Act. To the contrary, it shows that the respective average efficiencies of life insurance companies and securities companies moved in the opposite directions to a considerable extent. Through empirical tests, we demonstrate the effect of the Act on the efficiency of Korean financial companies, and suggest the countermeasures for each financial group against the Act.
Development of Evaluation Method for Performance of Weapon System using Axiomatic Design based Inner Dependence AHP
Cho, Hyunki ; Kim, Woo-Je ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 45~65
DOI : 10.7737/KMSR.2012.29.3.045
Test and evaluation of weapon system is an important task to evaluate the performance of overseas weapon system purchasing project. Especially, quantitative evaluation of performances is hardly completed in defense projects where multiple criteria are conflicted each other. In order to solve this problem, we apply Axiomatic Design (AD) and Inner Dependence AHP method. First, finite functional requirements (FRs) are categorized in hierarchy structure by selecting proper design parameters (DPs) to implement their corresponding FRs. If there are no ways to select DPs when design is coupled between FRs and DPs, then inner dependence is allowed to overcome the strict rule of independence in AHP. Second, the weights of DPs are calculated by applying both Inner Dependence AHP method for coupled design and normal AHP method for uncoupled or decoupled design. Finally, information axiom of AD is applied to the proposed weapon systems by calculating information contents for all parameters. Weapon system with minimum sum of information contents is considered as the best solution. The proposed method in this study should be used in multiple criteria decision making problems involving various conflicting criteria.
The Effect of Environment Uncertainty and Local Infrastructure on the Firm Culture, Operations Performance and Marketing Performance
Ju, Ki-Jung ; Kim, Jang-Ho ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 67~80
DOI : 10.7737/KMSR.2012.29.3.067
This study analyzes the relationship among environment uncertainty, local infrastructure, flexible-open firm culture, operations performance and marketing performance focus on SMEs. This research has revealed that the relation among firm size, firm type, firm culture, operations performance and marketing performance as well. The findings show that firm has its culture which is preparing environment uncertainty and local infrastructure influence on forming firm culture. Change-oriented and leaning-oriented firm cultures affect operations performance and marketing performance. In conclusion, this study suggests implication and limitations for further research.
Robust Parameter Design Based on Back Propagation Neural Network
Arungpadang, Tritiya R. ; Kim, Young Jin ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 81~89
DOI : 10.7737/KMSR.2012.29.3.081
Since introduced by Vining and Myers in 1990, the concept of dual response approach based on response surface methodology has widely been investigated and adopted for the purpose of robust design. Separately estimating mean and variance responses, dual response approach may take advantages of optimization modeling for finding optimum settings of input factors. Explicitly assuming functional relationship between responses and input factors, however, it may not work well enough especially when the behavior of responses are poorly represented. A sufficient number of experimentations are required to improve the precision of estimations. This study proposes an alternative to dual response approach in which additional experiments are not required. An artificial neural network has been applied to model relationships between responses and input factors. Mean and variance responses correspond to output nodes while input factors are used for input nodes. Training, validating, and testing a neural network with empirical process data, an artificial data based on the neural network may be generated and used to estimate response functions without performing real experimentations. A drug formulation example from pharmaceutical industry has been investigated to demonstrate the procedures and applicability of the proposed approach.
A Study on Selection Capability and Investment Efficiency of Korean Venture Capitals
Sohn, Dong-Won ; Hur, Wonchang ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 91~105
DOI : 10.7737/KMSR.2012.29.3.091
This paper examines the investment efficiency of Korean venture capitals during 1987~2006 (20 years), focusing on their selection capability. Despite the Korean government's efforts, venture capital industry has evolved in a slow speed. Since the genesis of venture paradigm in Korea at 1997, venture capital industry as a macro unit has been fully discussed in Korean contexts. But venture capital's activities at micro level regarding each investment's outcome have not been examined. This study attempts to fill the voids of micro knowledge about each investment success rates by venture capitals. We analyzed venture investment records in 4,791 venture startups and their success rates. Their investment criteria were relevant to high potential industries and amount of tangible assets. But their criteria were not relevant to R&D intensity and financial growth of venture firms, which may indicate low level of maturity about Korean venture capital industry. We found that Korean venture capital's investment pattern may be originated from the low return of investment, so that efficiency of IPO markets is a prerequisite for the upgrade of venture capitals' efficiency. Some policy implications are discussed.
An Effective Genetic Algorithm for Solving the Joint Inventory and Routing Problem with Multi-warehouses
Jung, Jaeheon ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 107~120
DOI : 10.7737/KMSR.2012.29.3.107
In this paper we propose an effective genetic algorithm for solving the integrated inventory and routing problem of supply chain composed of multi-warehouses and multi-retailers. Unlike extant studies dealing with integrated inventory and routing problem of supply chain, our model incorporates more realistic aspect such as positive inventory at the multi-warehouses under the assumption of inventory policy of power of two-replenishment-cycle. The objective is to determine replenishment intervals for the retailers and warehouses as well as the vehicles routes so that the total cost of delivery and inventory cost is minimized. A notable feature of our algorithm is that the procedure for evaluating the fitness of objective function has the computational complexity closing to linear function. Computational results show effectiveness of our algorithm.
Component Procurement Planning with Demand Uncertainty Under Assemble-to-Order Environments
Lee, Geun-Cheol ; Kim, Jung-Ug ; Hong, Jung Man ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 121~134
DOI : 10.7737/KMSR.2012.29.3.121
In this study, we consider a component procurement planning problem where the procurement amounts of components are determined under assemble-to-order systems with demand uncertainty. In the problem, procurement amount of each component is decided before the demands of finished products are known and after the demands are identified the assembly amounts of the finished products are decided. In this study, the objective function of the problem is minimizing the total costs which are composed of purchase and inventory costs of the components and the backorder costs of the finished products. We assume that the uncertain demand information is given as multiple scenarios of the demands, and we propose procurement planning methods based on stochastic models which considering the multiple demand scenarios. To evaluate the performances of the proposed methods, computational experiments were carried out on the proposed methods as well as benchmarks including a method based on deterministic mathematical model and a heuristic. From the results of the computational tests, the superiorities of the proposed methods were shown.
The Factors Affecting the Intention to Purchase Digital Items and Continuance Intention in Social Networking Communities： Focused on Relationship Maintenance Mechanism and Expectation-Confirmation Model
Kang, Heetaek ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 135~156
DOI : 10.7737/KMSR.2012.29.3.135
Due to the rapid growth of social networking community (SNC), research into SNC user's behavior has recently emerged as an important issue in information systems. An individual makes a decision whether or not to continually use his or her own SNC and to purchase digital items to decorate it. Most previous research has focused on a user's continuance intention and has ignored the importance of purchase intention. This study develops and empirically tests an integrated model designed to predict a user's two types of behavioral intention：continuance intention and purchase intention based on the expectation-confirmation model (ECM) and a dual model of relationship maintenance mechanism.The results indicate that perceived usefulness, satisfaction, personalization, and switching cost have important influences on the formation of SNC continuance intention. The results also show that perceived usefulness and satisfaction does not have any significant impacts on purchase intention, while personalization, learning, attractiveness of alternatives, and continuance intention significantly affect it.
Order Promising Methods Considering Scheduling and Order Releasing in Parallel Machine Shops
Shim, Sang-Oh ; Lee, Geun-Cheol ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 157~168
DOI : 10.7737/KMSR.2012.29.3.157
In this study, we consider an order promising problem at parallel machine shops where orders arrive dynamically. We develop methods for the problem, which instantly quote the due-dates of arrived orders. In this study, we first propose methods which can estimate flow times of orders, in which the current and future inventory status as well as the specific scheduling scheme used in the shop are taken into account, and then the due-dates are set by the order promising methods using the estimation results. The quoted due-dates of orders are compared with the actual completion times of those which are obtained from the simulation runs. The series of computational experiments show that the superior performance of the proposed methods in terms of the accuracy of due-date quotation.
Co-Evolution between Open Innovation and Absorptive Capacity in Korean SMEs
Sohn, Dong-Won ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 169~182
DOI : 10.7737/KMSR.2012.29.3.169
This study examines the co-evolutionary process between open innovation and firms' absorptive capacity. The effects of open innovation can be maximized through the capacity to absorb the knowledge from the external sources such as universities, government-support research institute, and private R&D centers. This study used data of STEPI technology innovation survey conducted at 2002, 2005, and 2008 (3 points measures). The data were analyzed through a structural equation model. Results suggest that open innovation at t0 point influences positively the absorptive capacity at t1 point, which subsequently enhances the intention of open innovation at t2 point. This result suggests the existence of co-evolutionary process between open innovation and firms' absorptive capacity. When knowledge comes from universities, the co-evolution has sustained; whereas when knowledge comes from private firms' R&D centers, the co-evolution has not effected. Theoretical and practical implications are discussed.
A Mathematical Model for Airline Ground Crew Scheduling Problem
Ko, Young Dae ; Oh, Yonghui ;
Korean Management Science Review, volume 29, issue 3, 2012, Pages 183~192
DOI : 10.7737/KMSR.2012.29.3.183
For the past several decades, personnel scheduling and rostering problem has been one of the most popular research topics in optimization area. Among the numerous applications, airline (aviation) industry has been given most attention due to the economic scale and impact. Most of the literatures about the staff scheduling problem in airline industry are dealing with the air crew, pilots and flight attendances, and the rest of the literatures are about the ground staff, by whom cleaning, maintenance, fueling of aircraft and handling luggage are done from landing to taking off. None of the literatures found by the authors are dealing with the airline ground crew. In this paper roster of airline ground crew, who is responsible for issuing boarding pass, checking baggage, etc, is introduced, formulated and solved using CPLEX. Some expressions of the mathematical formulations, which are not suitable input format of the CPLEX, were transformed. Numerical examples are presented for the validation of proposed scheduling system.