• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.245-248
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• 2006

The first of korean 750kW gearless type wind turbine is developed. The wind turbine is designed, manufactured and tested by GE regulation and obtained the design certificate by GL. And the performance test is being performed at the demonstration site now. This paper presents the history of development and performance test for 750kW gearless type wind turbine.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.312-314
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• 2006

포항공과대학교의 포항풍력에너지연구소(PoWER Center)가 개발에 참여했던 750kW급 직접구동형 국산화 풍력발전시스템(KBP-750D)은 그 개발이 완료되어 2005년 말경 대관령의 풍력실증단지에 설치되었고 현재는 시험운전이 수행되고 있다. KBP-750D의 상용화를 위하여 출력성능 및 하중측정을 통한 실증연구가 진행되고 있으며, 현재는 KBP-750D에 대한 출력성능 및 하중 측정을 수행하기 위하여 계측장치가 설치되어 시험 측정이 진행되고 있다. 본 발표에서는 풍력발전시스템에 설치된 계측장치의 구성 및 설치 결과를 상세히 보고한다.

• 한국정보시스템학회지:정보시스템연구
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• 제24권2호
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• pp.97-116
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• 2015

Purpose This study suggested the four forms of inter-organizational relationships(IORs): partnerships, inter-dependence relationship, trust relationship, and market relationship. The purposes of this study include the demonstration of four forms of IORs and the investigation of the relationships among forms of IORs, inter-organizational information flow(IOIF), kinds of e-commerce strategies, and the supply-chain performance of a firm. Design/methodology/approach The empirical data were collected through post-survey. 92 survey data were collected. With a cluster analysis, we confirmed four types of IORs, and the relationships among critical variables. Findings The results of cluster analysis showed that according to the types of IORs, the frequency and quality of IOIF are different. Appropriate kinds of e-commerce strategies were examined under the each types of IORs, which cause specific patterns of IOIF. It was found that the adoption of e-procurement strategy can improve the supply-chain performance of a firm in trust relationship. It was also observed that under partnerships, the use of e-partnerships strategy can contribute to the improvement of supply-chain performance.

• Structural Engineering and Mechanics
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• 제23권3호
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• pp.279-292
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• 2006

Natural hazards, including the wind hazard and others, threaten the integrity of the modern society. A transportation system usually consists of roadways, bridges and related vehicles. Harsh environmental conditions, caused by such as wind, exist in the real world frequently and affect the dynamic performance of the transportation system through their interactions. Long-span bridges are usually the backbones of transportation lines. In windy conditions, the information about the dynamic performance of bridges and vehicles considering full interactions of environmental factors is very essential for people to assess the overall operational conditions and safety risks of the transportation lines. Most of existent approaches target specifically at several isolated tasks considering partial interaction effects. In order to improve the understanding of these related-in-nature problems integrally as well as the consistency of different approaches, a unified approach to integrally predict the dynamic performance of long-span bridges and vehicles under wind is introduced. Such an approach can be used as a general platform to predict the dynamic responses of vehicles and bridges under various situations through adopting both commercial and in-house software. Dynamic interaction effects can be fully considered automatically for each situation. An example of a prototype bridge in US is given for the purpose of demonstration.

• 한국자동차공학회논문집
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• 제15권3호
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• pp.99-105
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• 2007

Currently, BLDC fuel pump was applied on LPi vehicle using 3rd fuel supply system as liquified phase LPG injection method had already shown better performance than others. Its cost, however, is rather expensive because of drawbacks such as complicated structure, a fault of localization of system. In this work, demonstration system for a developed turbine type fuel pump to replace BLDC system was setup and investigated. This study results that fuel mass flow rate of turbine type pump and injection performance of injector were better compared to BLDC type. Comparing flow rate of summer LPG with that of winter LPG, the flow rate decreased about 25% using winter LPG. Performance applying turbine type LPi fuel pump to engine is confirmed.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.404-409
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• 2007

For a hermetic reciprocating compressor, it has been known that the gas pulsation in the suction line affects the compressor performance, and suction muffler design has been focused on both of noise reduction and minimum pressure drop across the muffler. Some studies have been carried out on the mutual interaction between the gas pulsation and the cylinder pressure to investigate some supercharging effects, but their efforts were limited on rather simple geometries. In this paper, interaction of the gas pulsation in the compressor suction line with cylinder pressure via suction valve motion has been calculated; for the gas pulsation analysis, modeling of Helmholtz resonators in series was used, and for cylinder pressure calculation, energy equations was set up for the gas inside the cylinder. For demonstration of this calculation method, four different types of suction line configurations for a hermetic reciprocating compressor were compared in terms of compressor performance and gas pulsation level.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권8호
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• pp.509-516
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• 2004

The concerns of distributed generations including photovoltaic(PV) system have been increased around the world since PV system is becoming widespread as a clean and gentle energy source for earth. In the future high density grid-connected PV systems will be interconnected with distribution network. As a result, the stability and long-term reliability of PV systems have become more important issues in this area. Grid-connected PV systems have been installed and monitored at field demonstration test center(FDTC) and also data acquisition system(DAS) has been constructed for measuring and analyzing performance of PV system to observe the overall effect of environmental conditions on their operation characteristics. The performance of PV system has been evaluated and analyzed for component perspective (PV array and power conditioning system) and global perspective (system efficiency, capacity factor, and electrical power energy) by field test and loss factors of PV system.

• 설비공학논문집
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• 제20권10호
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• pp.645-653
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• 2008

Spiral-jacketed thermal storage tanks can greatly simplify solar heating systems while maintaining the thermal performance at a similar level as conventional systems with an external heat exchanger. Proper design of the spiral-jacket flow path is essential to make the most of solar energy, and thus to maximize the thermal performance. In the present work, computational fluid dynamics (CFD) analysis was carried out for a spiral-jacketed storage tank installed in a solar heating demonstration system. The results of the CFD analysis showed a good agreement with experimentally determined thermal performance indices such as the acquired heat, collector efficiency, and mixed temperature in the storage tank. This verified CFD modelling approach can be a useful design tool in optimizing the shape of spiral-jacket flow path and the flow rate of circulating fluid for better performance.

• 한국추진공학회지
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• 제9권4호
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• pp.81-88
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• 2005

가스터번 엔진의 성능을 예측하기 위해서는 자신의 성능 특성을 포함한 구성품 성능도가 요구된다. 본 연구에서는 유전 알고리즘을 이용하여 압축기 성능도를 제작사에서 제공한 성능덱으로부터 역으로 식별하는 방법을 제안하였다. 알고리즘은 경사 로터 방식 스마트 UAV를 위한 PW206C 터보축 엔진에 적용하였다. 제안된 방법을 검증하기 위하여 새롭게 만들어진 압축기 성능도를 이용한 해석 결과와 제작사에서 제공한 EEPP(Estimated Engine Performance Program) 덱(deck)을 이용한 해석 결과를 비교하였다. 또한 기존의 스케일링 방법을 이용하여 얻어진 구성품 성능도를 이용한 해석결과와도 비교하였다. 그 결과 운용 영역이 설계점에서 멀어질수록 기존의 스케일링 방법을 이용한 구성품 성능도를 사용한 경우 오차가 크게 증가하였다. 반면 유전알고리즘을 이용하여 생성된 압축기 성능도를 사용한 경우 EEPP의 해석결과에 더 근접함을 확인할 수 있었다.

• 한국연극학
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• 제49호
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• pp.171-208
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• 2013

Site-specific performance is always the real on-site work taking place at the site. Hence, it deals with the reality, in other words, the time of creation and formation. And it creates value and meaning through the interaction and continuous direct communication process between the performers, audience and the local residents. In this performance, the audience's status as the passive observer changes. They become the co-agent who actively lead and complete the performance through their own experience. We have examined the The Working Methods of Site-specific Performance and Aesthetics of Effect through four Korean performances ; Marie, An aesthetic experiment of site as the storyteller; Heterotopia and Urban Movement Research or Play: We Will Move Your Sofa, as performances which have Revealed history, politics, institution engraved in the site ; A Song of Mandala and Miracle, as a ritualistic site-specific performance at the historic site. Some remarks on Site-specific performance ; First, In Site-specific performance, the habitus peculiar to the stage art and the mode of reception are changed. Second, a new mode of theatrical communication requires creator and audience to have a sharp aesthetic sensibility and to change one's perceptual habit. Third, Site-specific performance can act as a demonstration for the viewpoints of political activism through what could be called a dramatic close-up effect. Fourth, Site-specific performance also has the risk of merely becoming an unfocused and scattered performance or degenerating into a pseudo-sightseeing. To avoid this, an in-depth study of the site and its socio-cultural context, and the clear motivation with which one is trying to reveal and tell from the site must be indispensable. As the co-agent, the audience should also be aware and think about what the given performance signifies today.