• 품질경영학회지
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• 제44권4호
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• pp.713-733
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• 2016

Purpose: The primary objective of this case study is to establish a COQ(Cost of Quality) management system for power generation industries. Key topics of this study include collecting COQ elements, their classifications, COQ computation formula, and determining COQ improvement projects. Results: A comprehensive set of COQ elements have been isolated for electric power generation companies. The COQ elements were classified in such a way that they could be managed according to the PAF model as well as the SIPOC diagram. This study showed that a systematic approach could be established for monitoring the COQ elements and using them in the process of improving quality competitiveness. Methods: The PAF(Prevention-Appraisal-Failure) model has been employed in the process of collecting COQ elements for a power generation company. All the cost of quality elements were first examined through an extensive review of articles and books in the field of quality. The cost elements were then refined and augmented by conducting a comparative study with international standards. The COQ elements have been verified by a group of quality managers and classified according to both the PAF model and the SIPOC diagram for better understanding in the entire organization. An improvement strategy has been also proposed by using a typical COQ level of power generation companies. Conclusion: The conventional PAF model was used in establishing a COQ management system for power generation industries. This case study illustrates the procedure about identification, classification and computation of quality costs, including selection of improvement projects. The system can be used not only for observing the current state of cost elements related to quality, but also for planning an improvement strategy using the ratio of cost classification.

• 정보저장시스템학회논문집
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• 제1권2호
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• pp.137-142
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• 2005

In this paper, we propose a new servo system design strategy to reduce the position error signal(PES) and track mis-registration(TMR) in magnetic disk drive systems. The proposed method provides a systematic design procedure based on the plant model and an optimal solution via an optimization with a 'Robust Random Neighborhood Search(RRNS)' algorithm. In addition, it guarantees the minimum PES level as well as stability to parametric uncertainties. Furthermore, the proposed method can be used to estimate the performance at the design stage and thus can reduce the cost and time for the design of the next generation product. The reduction of PES as well as robust stability is demonstrated by simulation and experiments.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.460-465
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• 2004

ESPR project started in 1999 with METI and NEDO support as five-years program in order to develop necessary technologies for the next-generation SST engine. In ESPR program, jet noise reduction technologies are focused as environmentally compatible technologies, which are critical to realize next-generation SST. In designing a lobed mixer nozzle which is a jet noise suppression system, there are many difficulties to understand the detailed flow phenomena occurred in the system because of its complexity. Large Eddy Simulation (LES) was applied to the lobed mixer nozzle flow analysis in ESPR project. The results demonstrated that LES approach was capable of predicting mixing characteristics of a complicated flow.

• 한국수소및신에너지학회논문집
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• 제24권5호
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• pp.353-358
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• 2013

To develop preferential CO oxidation reaction (PROX) catalyst for small scale hydrogen generation system, supported Pt catalysts have been applied for the target reaction. The supports were systematically changed to optimize supported Pt catalysts. $Pt/Al_2O_3$ catalyst showed the highest CO conversion among the catalysts tested in this study. This is due to easier reducibility, the highest dispersion, and smallest particle diameter of $Pt/Al_2O_3$. It has been found that the catalytic performance of supported Pt catalysts for PROX depends strongly on the reduction property and depends partly on the Pt dispersion of supported Pt catalysts. Thus, $Pt/Al_2O_3$ can be a promising catalyst for PROX for small scale hydrogen generation system.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.134-136
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• 2014

차세대 에너지 관리시스템에서 계통 해석 프로그램은 집중원격감시 시스템으로부터 취득된 데이터를 이용해 토폴로지, 상태추정, 조류계산, 상정사고, 고장해석 등의 해석 정보를 계통 운영자에게 전달한다. 지속적으로 증가하는 전력수요에 신속하게 대처하기 위해서 계통 해석 프로그램은 대규모 계통의 계획과 운영을 빠르고 정확하게 분석하여 대책을 수립할 수 있어야 한다. 본 논문에서는 계통 해석 프로그램들 중 특히 많은 시간이 소요되는 상정사고 해석 프로그램의 특성을 분석하고 성능 개선 방안을 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.62-64
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• 2002

Power quality monitoring system is devoted to more concern than before, because the innovation of industrial technology needs more accurate instruments and more advanced power quality. Therefore, this paper is proposed to use digital protective relays for power quality monitoring. In addition, taking power quality events, Electrical magnetic phenomenon of IEEE std 1159, proposing that adaptive power quality event list consider limitation memory capacity and signal processing ability of protective relay. The prototype S/W of power quality analysis is also developed. Especially this prototype S/W analysis scheme is verified through many kinds of power quality events (gathering protective relay data) in EMTP simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 C
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• pp.1837-1839
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• 2003

Recently deep interests have been paid on the effective generation of ozone, which has been widely used for water treatment, deoderization, color removal and chemical processing of exhausted smoke. The silent discharge reaction has been proposed as the most effective in the many ozone generation methods by electric discharge, because silent discharge excel others in the condition of high ozone generation yield and low power consumption. In this paper, ozone water generated system measure with silent discharge characteristics and pulsed power supply.

• 한국항공우주학회지
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• 제42권8호
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• pp.713-721
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• 2014

현재 유럽과 미국에서는 각각 GRC(Green Rotorcraft) 와 SRW (Subsonic Rotary Wing program) 프로그램을 통하여 차세대 회전익기 개발이 진행 중에 있다. 이들 프로그램의 최종 목적은 현재 사용 중에 있는 단거리 여객기를 일부 대체 할 수 있는 틸트로터 타입의 중/소형 민간 회전익기 개발에 목적을 두고 있다. 또한 이들 틸트 로터의 민간 운영에 운영할 수 있는 안전한 운행을 위하여, 각각 개발 중인 air transport management(ATM) 시스템인 SESAR(Single European Sky ATM Research) 와 NextGen(Next Generation Air Transport System)과 융합하는 기술도 병행되고 있다. 이들 프로그램들은, 최종 목표인 틸트 로터기의 개발이 진행되는 중간 과정으로, 현재 사용되고 있는 헬리콥터의 성능의 향상도 병행하고 있다. 이러한 성능 개발은 좀 더 효율적인 추진기관, 능동 로터 시스템, 내/외부의 소음 감소 등에 중점을 두고 있다. 특히 유럽의 GRC 프로그램에서는 소음, 연료소비율, 배기가스 (CO2, NOx)의 절감 등에 매우 구체적인 목표를 설정하여 기술 개발을 진행 중에 있다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 하계학술대회 논문집
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• pp.521-523
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• 2007

기존의 PCS는 저 출력에서 효율과 전력 품질이 낮은 단점을 가지고 있다. 이로 인하여 발전 사업자용 태양광 발전 인버터로 사용 시 전력 생산량이 떨어지게 된다. 이를 개선하기 위해서, 한 대의 단일 PCS 내에서 두 대의 인버터 스택을 적용, 개별/병렬 운전하여 효율과 전력품질을 향상시키고자 하며, 향후 500kW급 인버터 개발에 기초 기술개발을 위하여 본 논문에서는 50kW급 계통 연계형 병렬 운전 PCS를 개발하였다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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• pp.232-239
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• 2004