• Journal of the Korea Safety Management & Science
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• v.3 no.2
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• pp.13-23
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• 2001

These days, there are many companies who are concerned with "Safety Management System"", which enables them to not only evaluate their safety but also control and prevent the risk of accidents. As plenty of institutes are developing and providing it for companies in addition to testing its operation, such companies take that system into account in a very positive way. This paper makes it possible for our company to introduce an appropriate program into its workplace by comparing and analyzing such Safety Management Evaluation Systems.uation Systems.

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.349-356
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• 2002

This paper describes a mathematical programming model for constructing the rolling stock assignment plan. This plan is a schedule which assigns daily routings, maintenance activities, and other tasks to trainsets. A generalized set partitioning model which is a kind of integer programming model is suggested as a model for constructing the assignment plan. And a column generation method are suggested as a solution method.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.52 no.2
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• pp.81-84
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• 2003

This paper presents a proper rational transfer function synthesis in the continuous time system from noisy measurements. The proposed method identifies the coefficients vector of the transfer function from an overdetermined linear system that develops from rearranging the two dimensional system matrices and output vectors obtained from the observed frequency responses. By computer simulation, the performance improvement is verified.

• 발명특허
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• v.18 no.1 s.203
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• pp.12-13
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• 1993

본회가 주최한 제 107회 발명 교실이 지난 1월 9일 발명장려관 연구실에서 개최됐다. 매월 둘째 토요일 오후 1시 30분에 개최되는 발명교실은 이 달에도 1백여 명이 참석하여 성황을 이루었다. 이날 발명교실에서는 코우드 전자 주식회사대표 정중석씨의 성공사례 발표에 이어 황종환 변리사의 $\ulcorner$산업 재산권제도$\lrcorner$에 이어 김관형 본회 상근이사의 $\ulcorner$발명의 창출과 사업$\lrcorner$에 대한 강의와 토론이 있었다. 발명가의 성공사례를 간추려 소개한다.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2003.05a
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• pp.360-365
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• 2003

많은 온라인 컨텐츠 회사들이 최근 온란인 광고수입의 한계를 느끼기 시작하면서 자신들의 서비스에 요금을 부과하는 경향이 있어왔다. 이 논문은 왜 온라인 컨텐츠회사들이 왜 자신의 서비스에 요금을 부과를 하게되었는지를 인터넷 시장의 성숙과 관련하여 살펴보고, 기존의 오프라인 컨텐츠회사들이 온라인시장에 진입시에 따른 전략을 고찰한다. 또한 온라인컨텐츠 시장에서의 가격전략과 관련된 시사점을 논의한다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1649-1652
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• 2005

Line constants are composed by impedances and susceptances. We don't need all line constants on electric railway system. Depending on where they are applied, The algorithm to get line constants Is different. We suggest two algorithm to measure them.

• Journal of the Korean Society for Precision Engineering
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• v.31 no.11
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• pp.969-974
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• 2014

Previously fabricated electronic devices were used for vacuum manufacturing processes such as conventional semiconductor manufacturing. However, they are difficult to apply to continuous processes such as roll-to-roll printing, which results in very high device manufacturing and processing costs. Therefore, many developers have been interested in applying continuous processes to contact printing or noncontact printing technologies and they proposed various continuous printing techniques instead of conventional batch coating. In this paper, we proposed improved gravure offset printing process as one of the contact printing technique. We used etching pattern geometry with soft core blanket roll for printing of ultra fine line below the 10um.Using this technique we obtained flexible metal grid mesh film as transparent conductive film.

• Transactions of The Korea Fluid Power Systems Society
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• v.3 no.3
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• pp.14-19
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• 2006

Recently, the cylinder of the excavator is applied in the various environment. So, we need the development of the simulator for the excavator. The simulator has the effects of the decrease of the cost and improvement of the cylinder's performance. In this paper, we design the simulator for the excavator and makes an analysis of the dynamics and structure. The simulator was applied to the excavator's models of 10ton, 20ton and 30ton because we built the data base of a real excavator's cylinder of information in the experiment. And we used the FEM analysis for the comparative study on the characteristics.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.150-157
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• 2011

Nowadays, high speed train has settled down as a fast and convenient environment-friendly transportation and it's need is gradually increasing. However increased train speed leads to increased aerodynamic noise, which causes critically affects comfortability of passengers. Especially, the pantograph of high speed train is protruded out of train body, which is the main factor for increased aerodynamic noise. Since aerodynamic noise caused pantograph should be measured in high speed, it is difficult to measure it and to analysis aerodynamic noise characteristics due to the various types of pantograph. In this research, aerodynamic noise of pantograph is predicted by CFD (Computational Fluid Dynamic) and FW-H (Ffowcs Williams-Hawkings) equation. Also, Wind tunnel test results and numerical simulation results were compared. As a result, Simulation results predicting sound pressure level is very similar with wind tunnel test result. This research will draw major factor in aerodynamic noise of pantograph and will be utilized for predict sound pressure level of pantograph.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.95-96
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• 2014

In this study, the nano-particle emitted from Gasoline Direct Injection(GDI) vehicles was measured using the Engine Exhaust Particle Sizer(EEPS) on a chassis dynamometer. In addition, driving mode were divided into cold start mode(CVS-75, NEDC) and hot start mode(NIER-6, NIER-9) to evaluated the characteristics in the various operating conditions. The Particle Number(PN) concentration was analyzed for various driving patterns, i.e., acceleration, deceleration, idling, cruising and the phases of mode. In a result, Total concentration of PN for size was concentrated from 50 to 100 nm and acceleration represents the highest concentration among the driving pattern. It is believed that the increases quantity of fuel, and mixture will be richer than other patterns.