• 비파괴검사학회지
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• 제30권4호
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• pp.317-323
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• 2010

원자력발전소 배관 용접부에 대한 수동 초음파검사는 KPD(Korean Performance Demonstration)의 일반 절차서를 사용하여 기량 검증을 인정받고 있으나, 자동 초음파검사의 경우에는 일반 절차서가 없으며 해당 자동 검사 장비를 이용하여 절차서 기량 검증을 받아야 한다. 현재까지 국내에서 수행되고 있는 자동 초음파검사에 대한 절차서 기량검증은 대부분 펄스-반사기법을 적용한 절차서이나, 최근에 각광받고 있는 위상배열 초음파검사 기법을 이용한 절차서 기량검증은 국내에서 시행된 사례가 전무하다. 본 연구에서는 원자력발전소 가동중검사에 위상배열 초음파검사 기법을 적용하기 위하여 위상배열 초음파 신호취득 및 평가 소프트웨어를 개발하고 위상배열 초음파 탐촉자 및 웨지를 설계 하였다. 개발된 절차서에 대하여 결함 검출, 길이 및 크기 측정에 대한 기량검증을 수행하였으며, 검증된 위상배열 초음파탐상검사 절차서는 향후 원자력발전소 배관 용접부 검사에 적용할 예정이다.

• 비파괴검사학회지
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• 제24권4호
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• pp.378-383
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• 2004

국내 원자력발전소의 Class1과 Class2 배관검사에 적용할 수 있는 초음파탐상 검사자, 장비 그리고 절차서에 대한 한국형 기량검증(KPD) 시스템을 구축하였다. PD 방법을 적용한 검사결과와 전통적인 dB-drop 방법을 이용한 검사결과를 상호 비교하기 위하여 Round Robin Test(RRT)를 수행하였다. RRT 결과는 PD 방법의 신뢰성이 dB Drop 방법보다 우수한 것으로 나타났다. 이러한 결과로부터 원자력발전소 가동중검사에 PD 방법을 적용함으로써 초음파탐상검사 결과의 신뢰성이 더욱 향상될 것으로 기대된다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.564-569
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• 2007

This study describes thermal performance of solar cooling and hot water for demonstration system with ETSC(Evacuated tubular solar collector) installed at Seo-gu art center of Kwangju. For demonstration study, a reading room with about 350㎡ was heated and cooled with the solar system. The system was consisted of ETSCs, storage tank, hot water supply tank, subsidiary boiler, subsidiary tank, absorption chiller, chiller storage tank, and cooling tower. The results of the experimental study indicated that the total solar energy gain as daily performance on a sunny day (August 25, 2007) with total daily radiation of $606\;W/m^2$ was 671 kWh, the collecting efficiency of 55%. In the case of supplies to heat source more than $83^{\circ}C$, cooling time operated by solar was driven 8.8 hours, cooling energy generated by solar system was 179 kWh and the solar cooling fraction was 79.2%, and hot water supplied with surplus heat source by the solar system was 201 kWh.

• 풍력에너지저널
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• 제4권1호
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• pp.20-29
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• 2013

Load measurement, which is performed based on IEC 61400-13, consists of three stages: the stage of collecting huge amounts of load measurement data through a measurement campaign lasting for several months; the stage of processing the measured data, including data validation and classification; and the stage of analyzing the processed data through time series analysis, load statistics analysis, frequency analysis, load spectrum analysis, and equivalent load analysis. In this research, we pursued the development of an analysis software in MATLAB to save labor and to secure exact and consistent performance evaluation data in processing and analyzing load measurement data. The completed analysis software also includes the functions of processing and analyzing power performance measurement data in accordance with IEC 61400-12. The analysis software was effectively applied to process and analyse the load measurement data from a demonstration research for a 750 kW direct-drive wind turbine generator system (KBP-750D), performed at the Daegwanryeong Wind Turbine Demonstration Complex. This paper describes the details of the analysis software and its processing and analysis stages for load measurement data and presents the analysis results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.516-519
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• 2003

3kW photovoltaic (PV) systems and data acquisition system are constructed for performance analysis of PV system at field demonstration test center (FDTC) of Korea. As climatic and irradiation conditions are varied, the performance characteristics of PV system are collected and analyzed in data acquisition system. From these results, the performances of gird-connected power conditioning system (PCS) fur PV system have been evaluated and analyzed. Furthermore, performance indices of grid-connected PCS e.g. output power, efficiency, loss factor, and the other index at the site are reviewed.

• 문화기술의 융합
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• 제7권3호
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• pp.415-424
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• 2021

본 연구는 성인 여성들을 대상으로 온라인 태권도 시범 공연으로 인한 플로우(Flow) 경험이 관여도 및 재관람 의도에 미치는 영향을 파악하고, 온라인 태권도 시범 공연의 활성화 및 관람객 증진, 성인 태권도 수련생 증진을 위한 실질적 자료를 제공하고자 한다. 이에 국기원 태권도 시범단이 공연한 '하이킥' 온라인 태권도 시범 공연을 관람한 관람객 들을 모집단으로 선정하였고, 결과와 논의를 통한 결론은 다음과 같다. 첫째, 여성 관람객들의 태권도 경험 유무로 인한 플로우, 관여도, 재관람의도의 차이는 플로우 하위요인 중 즐거움 요인을 제외한 주변의식, 시간왜곡, 관여도. 재관람의도 요인에서 차이가 있는 것으로 나타났다. 둘째, 온라인 태권도 시범 공연의 플로우(Flow) 요인 중 주의집중, 즐거움, 시간왜곡 요인은 관여도에 긍정적인 영향을 미친 것으로 나타났다. 셋째, 온라인 태권도 시범 공연의 플로우(Flow) 요인은 재관람의도에 긍정적인 영향을 미치는 것으로 나타났다. 넷째, 온라인 태권도 시범 공연의 관여도는 재관람의도에 긍정적인 영향을 미치는 것으로 나타났다.

• 한국압력기기공학회 논문집
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• 제6권1호
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• pp.23-28
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• 2010

To enhance the reliability of ultrasonic testing system, MOST(Ministry of Science and Technology) bulletin 2004-13 was published in 2004.6 requiring performance demonstration in ultrasonic examination and MEST(Ministry of Education, Science and Technology) 2009-37 was published in 2009.9(formerly MOST bulletin 2004-13). In order to meet the MEST bulletin requirement and increase the reliability of ultrasonic testing, all the ultrasonic examination procedure and equipment should be performance demonstrated and qualified. In this paper, generic procedure for the ultrasonic examination of dissimilar metal welds are described and new technique are introduced.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.707-710
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• 2003

3kW grid-connected photovoltaic (PV) system and data acquisition system are constructed for performance analysis of PV system at field demonstration test center of Gwang-Ju in Korea. As climatic and irradiation conditions are varied, operation characteristics of the PV system are collected and analyzed in data acquisition system. From these results, the performances of PV system have simulated and evaluated using simulation tool in comparison with actual value of data acquisition system of field demonstration test center. Furthermore, performance of total PV system e.g. electric power and loss factor at the site are reviewed.

• KIEAE Journal
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• 제4권4호
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• pp.45-52
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• 2004

Simulation of daylighting by computer program is a method to avoid unnecessary efforts in manufacture of its testing models, to reduce its measuring tolerances and be able to provide variations of various weather conditions as well. Many simulation programs on daylighting have been released freely or commercialized for selling, however, a demonstration of their availability and validity as a tool for evaluating daylighting performance is required since each one has its own characteristics. The objectives of this study lie in suggesting an application method of evaluation tools and demonstration of limits and characteristics so as to more easily determine the daylightingperformance in the very initial stages of planning for an arbitrary office space in which windows with daylight access are built. We produced scale model of the general light inducing type side lighting with lightshelfand ceiling, and the luminance (at 78 measuring points) and illuminance (at 84 measuring points) were measured in a clear sky. And a comparison of the measured values and the calculated values from a computer simulation using the Lightscape program was performed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1353-1355
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• 2003

Total six units of 3kW photovoltaic (PV) system and data acquisition system (DAS) are constructed for analyzing performance of PV system at field demonstration test center of Gwang-Ju in Korea. As climatic and irradiation conditions are varied, operation characteristics of the PV system are collected and analyzed in data-acquisition system. Furthermore, not only performance test of each PV system component such as PV module and power conditioning system, but also performance of total PV system e.g. system efficiency, electric power and loss factor at the site are reviewed.