• Proceedings of the Korean Operations and Management Science Society Conference
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• 1993.04a
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• pp.49-56
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• 1993

We consider a B/G/1 queueing system with vacations, where the server closes the gate when it begins a vacation. In this system, customers arrive according to a Bernoulli process. The service time and the vacation time follow discrete distributions. We obtain the distribution of the number of customers at a random point in time, and in turn, the distribution of the residence time (queueing time + service time) for a customer. This system finds an application in the performance evaluation of the DQDB protocol which has been adopted as the standard protocol for IEEE 802.6 MAN.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2001.10a
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• pp.334-337
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• 2001

기존의 통신사업자는 전통적 음성서비스를 고도화하기 위한 백방의 노력을 기울이고 있다. 여러 가지 부가서비스의 개발 등을 통해 차별화 전략을 구사하고 있는데, 이중에서도 결합서비스의 제공은 가격측면이나 마케팅적 측면에서 가장 손쉬운 서비스 고도화전략이라고 볼 수 있다. 그러나 현재 우리나라의 경우, 시장지배적 기간통신사업자의 결합 서비스 제공은 원천적으로 금지되어 있다. 이에 본 논문에서는 결합서비스의 전반적 상황을 총괄해보고, 결합서비스의 제공에 관한 개념적 확립 및 세계 각국의 현황과 국내 제도적 현황을 분석해봄으로써 향후 나아가야 할 올바른 방향에 대해 다각적인 고찰을 해보고자 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2001.10a
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• pp.383-386
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• 2001

In this paper, we propose a new personalized information service method using multiple regression analysis for Internet shopping malls. We then apply the proposed method to Internet bookstore, and compare personalized Internet bookstore providing personalized book information with ordinary Internet bookstore providing random book information. Experiment results show that the personalization of Internet bookstore increases satisfaction and purchasing intent of customers.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2001.10a
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• pp.391-394
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• 2001

본 연구에서는 기업이 ASP(Application Service Provision)도입을 추진할 때, 사용자 입장에서 인지될 수 있는 위험요인들을 기존의 정보시스템 아웃소싱과 ASP의 문헌연구를 통해 도출하여 각각을 차원별로 범주화하고, 둘 간에 어떤 차이점과 유사점이 있는지를 알아봄으로써 기업이 성공적으로 ASP를 추진할 수 있는 토대를 제시함을 목적으로 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2007.11a
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• pp.413-417
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• 2007

본 논문에서는 응용서비스 제공자가 망사업자의 망을 이용하여 응용서비스를 제공하고 망사업자에게 사용대가를 지불하는 경우를 다루었다. 우리는 Stackelberg 게임을 이용하여 두 사업자간의 계약(contract)설계 문제를 정형화하였고 이 게임의 균형점 (equilbrium)이 유일하다는 것을 보였고 또 이 균형점이 망사업자의 위험선호도에 따라서 어떻게 바뀌는지를 고찰하였다.

• Journal of the Korean Operations Research and Management Science Society
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• v.6 no.1
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• pp.75-82
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• 1981

This paper considers urban emergency service systems that dispatch vehicles (facilities) from fixed bases with the objective of finding an optimum allocation of emergency facilities. A case study of fire station problem of Seoul city is conducted to analyze the deployment of fire-fighting resources and develop a class of improved deployment strategies with Parameteric Allocation Model (P.A.M.). The study shows a long term plan leading to balanced fire protection for most fire hazardous districts as well as low alarm districts.

• Journal of the Korean Operations Research and Management Science Society
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• v.15 no.1
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• pp.63-72
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• 1990

This problem in this paper concerns the determination of safety stock for multi-echelon invenetory system. In this model the criterion is to minimize system safety stock subject to a service level constraint and expected annual total cost. Then, safety stock is determined by minimizing expected annual total cost and satisfying given service level. This expected annual total cost is obtained by expected total inventory holding cost plus the expected total stockout cost. Numerical example is given in a three-echelon inventory system. The results obtained by the use of the Hill Algorithm.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.10a
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• pp.182-185
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• 1996

This paper analyzes how the international callback services affect on the international telecommunications market. We present a simple game-theoretic model to compare the equilibrium outcomes before and after the arrival of callback operator. We find that the callback service arises from the inefficiencies in the national telecommunications market and the accounting rate system between international telecommunications carriers. Also, we identify the conflicting interests among the governments and carriers, by examining how the callback service affects the collection rate, quantities demanded, carrier's profit and social welfare of each country.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.288-290
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• 2006

본 논문은 RFID 기반 유비쿼터스 환경이 인터넷 에스크로 서비스와 연계 되었을 때 특히, EPCglobal 네크워크에 기반한 EPC IS (Electronic Product Code Information Service)와 연계된 RFID 기반 상품 라이프 사이클 관리 및 추적 기술과 금융 서비스인 인터넷 에스크로 서비스의 상호 연동에 관한 내용을 다룬다.

• Journal of the Korean Operations Research and Management Science Society
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• v.11 no.2
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• pp.69-78
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• 1986

The outlook for the Civil Service Pension (CSP) program in Korea indicates several problems. First, the balance of the benefit among the pension recipients is not well maintained. Second, the program is running out of funds as benefit increases exceed the growth in revenues. In this article, we analyze these problems by using linear programming model and discuss the alternatives. We propose an addition of the age limit to the benefit eligibility and a reconsideration of the government subsidy's level.