• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1412-1417
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• 2011

Safety is soaring up as a core value in accordance with the recent improvement of operating speed & incidents. rolling stock is a kind of system which works together with several components. one component has an effect on the sub-system, which can cause to the train safety operation, therefore reliability management of the major components of rolling stock is a kind of solution to the safety operation of train, but realistically maintenance in korea performed based on period rather than TBO of major components, but Japan does new maintenance system based on the major components, which optimizes maintenance tasks. actually Japan can apply to new maintenance system because they are ready in planning step but in this study, making a reliability data of major components and review the adaptability of new maintenance system to the rolling stock operating in Ansan line.

• JSTS:Journal of Semiconductor Technology and Science
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• v.9 no.4
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• pp.257-265
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• 2009

Recent progress in development of CMOS power amplifiers for mobile terminals is reviewed, focusing first on switching mode power amplifiers, which are used for transmitters with constant envelope modulation and polar transmitters. Then, various transmission line transformers are evaluated. Finally, linear power amplifiers, and linearization techniques, are discussed. Although CMOS devices are less linear than other devices, additional functions can be easily integrated with CMOS power amplifiersin the same IC. Therefore, CMOS power amplifiers are expected to have potential applications after various linearity and efficiency enhancement techniques are used.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.104-107
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• 2002

Direct Metal Manufacturing (DMM) is a new additive process that aims to take die making and metalworking in an entirely new direction. It is the blending of five common technologies : lasers, computer-aided design (CAD), computer-aided manufacturing (CAM), sensors and powder metallurgy. The resulting process creates parts by focusing an industrial laser beam onto a tool-steel work piece or platform to create a molten pool of metal. A small stream of powdered tool-steel metal is then injected into the melt pool to increase the size of the molten pool. By moving the laser beam back and forth, under CNC control, and tracing out a pattern determined by a computerized CAD design, the solid metal part is built line-by-line, one layer at a time. DMM produces improved material properties in less time and at a lower cast than is possible with traditional fabrication.

• Journal of the Society of Naval Architects of Korea
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• v.52 no.5
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• pp.365-371
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• 2015

Hull plate consists of various types of curved plates and there also exists corresponding processing methods. Typically, curved plates can be divided into convex type and saddle type. Large amount of research has been conducted mainly focusing on application of processing method of convex type, saddle type and hybrid type, but research on determination and processing method application of the most difficult S-shaped curved plate that has inflection lines has not been carried out yet. In this paper, as the fundamental research of appropriate processing method application, a calculation method is proposed to calculate inflection lines on curved plates. In order to calculate inflection lines, normal curvature and information of fabricated curved plates should be utilized. We compare the workability of the fabrication for hull plate using inflection line.

• Journal of Fashion Business
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• v.9 no.4
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• pp.30-43
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• 2005

The purpose of this study is to examine the ladylike style of Grace Kelly focusing on her costume design of 1950s movie and star image, and to understand how she became a fashion icon today. Her city elegant look was usually composed of A line or H line suits and dresses, pearl jewelry, gloves, handbags and her classic ladylike attitude. Kelly's luxury casual look epitomized a relaxed elegance based on the American sporting image including the Hermes "Kelly" bag. Her sexual elegant look showed the combination of freshness, ladylike virtue and underlying sex appeal. Her self-confident, ladylike style appeals to modern fashionable women who likes to be elegant but also sexy.

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.946-949
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• 2003

In this paper, a DDFS(Direct Digital Frequency Synthesis)chip has been designed focusing on the reduction of ROM size and implemented using FPGA. When calculating the sine value for the input phase value, we used the Taylor series expansion approximation method to reduce the number of addresses of ROM. We also used the piecewise straight line approximation method, ie, the stored value int the ROM is the difference of the sine value and the straight line approximation. Using this method, we could reduce four bits for each ROM data.

• Proceedings of the Korean Society for Information Management Conference
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• 1997.08a
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• pp.113-116
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• 1997

본 논문은 온라인목록시대에 돌입한 오늘날 정보자료를 찾고자 하는 이용자들의 접근점이 되는 표목이 어떻게 변천되어 왔는지를 KCR과 AACR을 중심으로 살펴보고, 현행규칙을 체계적으로 분석하여 문제점을 파악하여, 온라인환경에서 표목을 어떻게 규정할 것인지 미래에 어떠한 변화가 예견되는지를 고찰하여 온라인환경에서의 한국편목규칙의 표목부에 합리적으로 적용될 수 있는 구체적인 방안을 제시하고자 한다.

• Journal of Korean Society for Quality Management
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• v.32 no.3
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• pp.153-165
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• 2004

Recently, financial service industry of Korea started to pay attention to private banking targeting to the rich. However, as the advanced foreign competitors have entered the market, strategic approaches are needed focusing on the general rich rather than the exceptional VIPs. In this paper, we use QFD to provide marketing strategies for Korean financial service providers. Our finding is that ‘intangible service provided by private banker’ and ‘off-line sales’ have marketing priority and ‘investment management’ and ‘value-added service’ follow.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.125.4-125
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• 2001

The problem of recongurable ight control is investigated, focusing on model reference adaptive control(MRAC) through imprecise fault diagnosis. The method integrates the fault detection and isolation(FDI) scheme with the model reference adaptive control, and can be implemented on-line and in real-time. The algorithm can cope with the fast varying parameters. The Simulation results demonstrate the ability of reconguration to maintain the stability and acceptable performance after a failure.

• Journal of Korea Technology Innovation Society
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• v.8 no.3
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• pp.1199-1224
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• 2005

This study analyzes various factors affecting a firm's investments, focusing on both a firm's ownership structure and CEO's incentives. While previous empirical works focus on various financial data in order to test the Schumpeterian Hypotheses, this paper is using various ownership structure data as well as financial data. Empirical results show that the greater a firm's CEO has the company's own stock, the less he spends in R&D investments. The main empirical results of this study is in line with past empirical studies on various markets outside of Korea.