• The Korean Journal of Applied Statistics
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• v.26 no.1
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• pp.151-162
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• 2013

Due to a growing demand for the second-hand product, especially for the expensive one, the warranty and maintenance policies for such products have been studied to improve the product reliability of late. In this paper we study a periodic maintenance model for the second-hand product which is purchased by the customer at the age of $x$. When purchased, the dealer provides a warranty of a fixed length during which the product is maintained periodically to reduce the failure rate of the product and thus, to improve the reliability after each maintenance is served. If a failure occurs between two successive maintenances, only minimal repair is conducted. As for the warranty policy, we adopt free non-renewing repair action on each failure, in addition to the periodic maintenance service during the warranty period. Thus, under the given warranty policy, all the maintenance and repair costs incurred during the warranty period are charged to the dealer. For the proposed periodic maintenance scheme, we formulate a cost model to evaluate the expected total cost charged to the dealer during the warranty period and derive an optimal upgrade level of the failure rate at each maintenance to minimize the expected total warranty cost from the perspective of the dealer. We also present numerical results for an optimal upgrade level based on the proposed methods.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1295-1297
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• 2002

This paper describes the pantograph design result for tilting train at conventional railway. EMU(Electrical Multiple Unit) Tilting Train is important tilting pantograph. Tilting train pantograh should be operated to commercial service speed 180Km/h of 200Km/h at KNR upgrade railroad. This specification pantograh tested using catenary-panto dynamic simulation

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.1202-1207
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• 2011

This article introduces the benchmarking methodologies, the results of comparative analysis on the railway electricity maintenance management - preventive maintenance, corrective maintenance, upgrade maintenance. This article also compares the Korean railway electricity maintenance management with the results mentioned above and analyses the situations of each country - France, Germany, Japan. Lastly this article tries to find the comparative position of the Korean railway infrastructure costs and discusses the direction of cost reduction in railway electricity maintenance management.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.360-366
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• 2005

This paper deals with the S/W development of web-based warehouse management system using ubiquitous RFID(Radio Frequency Identification). This S/W System supports the realtime inventory management and collaborative operations of relational companies in SCM. We expect to decrease the logistic cost and to upgrade the status of WMS and competitive power of company.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.482-485
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• 2004

A Performance Based Design procedure for retrofitting the RC frame with friction dampers is described. The Capacity Diagram Method procedure is used to estimate the inelastic response of the example model. The example models were retrofitted using SBC dampers and the retrofitted example models were computation ally modeled. The results show that the performance of the retrofitted frame satisfies the target objective.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.660-660
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• 1998

본 논문은 SUN Solaris 2.6 환경에서 동작 중인 Dynamic Linking Library (DLL)를, 이 DLL을 사용하는 응용 프로그램의 동작에 영향을 주지 않고 온라인으로 교체하기 위한 방법을 제시한다. 구체적으로 이 논문은 Solaris 환경에서의 동적 링킹의 방법과 구조를 분석하고, 이로부터 DLL을 온라인으로 업그레이드하기 위한 교체 환경과 절차 및 방법을 제시하며, 실제 업그레이드를 통해 제시된 방법의 기능을 확인한다. 또한 제시된 방법을 동적 링킹을 사용하지 않은 일반 실행 파일의 온라인 교체에 활용하기 위한 방안을 제시한다.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.116-118
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• 2012

충남도청의 이전으로 인지도가 높아진 충청남도 홍성군, 그러나 홍성하면 떠오르는 무엇인가가 없다. 홍성의 한우는 횡성의 한우와 비교하여 인지도가 떨어지고, 지리적으로 가까운 슬로시티 예산군과 머드의 고장 보령시에 비해서도 인지도 상대적으로 낮은 상태이다. 이를 위한 해결책으로 감성을 울리는 이야기 '스토리텔링'과 스포츠 방송 영화 등 대중적 인지도가 높은 스타를 내세워 기업의 이미지를 높이는 마케팅전략인 '스타마케팅'을 통하여 홍성군의 인지도와 호감도를 상승시키고자 하였다.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.119-122
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• 2003

This study was carried out to propose some useful advices for the improvement policy of the minor rural roads. From the case study on 5 country areas of Chonnam Province, it was ascertained that above a third of minor rural roads did not meet the statutory minimum level of their width, which means the necessity of substantial upgrade of road improvement works in rural areas.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10a
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• pp.279-284
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• 1988

In this paper, NCTOP is an interactive NC auto programming system for two-dimensional machining. NCTOP consists of seven modules, that is pattern form input, free form input, AutoCAD interface, logic processing, postprocessor processing, output, and database upgrade module. The geometry information of a workpiece to be machined is put into NCTOP program. Then it generates NC program which is final output. NCTOP uses the machining dates from the data base.

• Publications of The Korean Astronomical Society
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• v.7 no.1
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• pp.149-153
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• 1992

We determined the efficiencies of the aperture. beam and forward spillover and scattering of 13.7 m radio telescope at Daeduk Radio Astronomy Observatory through the observations of the planets and Moon. The main panels adjustments were carried out on September 1991 and the improvements in the efficiencies were checked by comparing the observations made before and after the panel adjustments. The efficiencies were turned out to be 0.35, 0,47 and 0.83 at 115.27 GHz for the aperture, beam and forward scattering and spillover. respectively. These marked nearly a factor of two upgrade of the efficiencies previously measured.