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김의한(Kim Eui-Hwan),임희천(Lim Hee-Chun) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
Currently the variety of governmental business support and research for supplying solar energy have been actively progressed. As of now, however, There are no practical testing infrastructures of grid- connected PV system which test performance of solar power facility in domestic. Therefore, KEPRI is constructing of practical testing ground of 500 ㎾ class grid-connected PV system for developing the evaluation of the performance technology including the module, inverter and etc. That is the important instrument of the PV system in Gochang area. It analyzed the site creation work for constructing the practical testing ground and new construction of control room and the unit standards, specifications and capacity of required equipment. For the system detailed design, the components of testing ground are needed to be built.
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증기발생기 세관 와전류 탐상 신호해석을 위한 주성분 분석
김영환,송성진,김의래,임창재,김기복,최영환 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
증기발생기(SG) 세관은 그 가동 특성상 결함이 발생할 가능성이 매우 높으며 이들의 건전성 확보는 원자력 발전소의 안전을 위해서는 필수적이다. 이들의 가동중검사에는 ECT가 널리 사용되고 있다. 본 연구에서는 bobbin coil probe를 사용한 원전 SG 세관 ECT신호를 해석하기 위해서 신경회로망을 이용하였다. ECT의 특징을 추출하였고, 이들 중에서 단일특징 분류성능을 분석하여 유용한 특징을 선택하였으며, 또한 주성분분석을 이용하여 유용한 특징들을 정의하였다. 이와 같이 정의된 특징들로 정의된 신경회로망을 학습시키고, 학습된 신경회로망으로 미지의 결함신호에 대해서 결함의 분류와 크기 산정을 수행하였다. 수치해석으로 만들어진 모사 ECT신호에 대해서 적용한 결과, 주성분분석으로 정의된 특징들을 사용하는 경우에 보다 적은 수의 특징을 사용함에도 불구하고 신호해석의 성능이 향상되었다. 따라서, 주성분 분석은 ECT신호와 같은 다변량 데이터를 처리하는데 매우 유용함을 알 수 있었다.
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김의한,김종달 龍仁大學校 武道硏究所 1997 武道硏究所誌 Vol.8 No.2
The purpose of this study was to analyze the biomechanical traits of individual favorite and major technique(Tokuinage), performing Seoi-nage (back-carry throw) with the 3-dimensional analysis. The subject, Korean national judoka who was a judo gold medalist in the -65kg weight category in the '95 Hukuoka Universiad was filmed on 16mm high speed cameras(50f./s. from the front, side and top view). The postural variables (joint angles and CM-to-CM angle) were computed through film analysis. From the data analysis and discussion, the following conclusions were drawn: 1) The anke joint angles of Kuzushi(the breaking of the opponent's balance) was 109∼105 degrees, Tsukuri(the preparation before throwing the opponent) was 96∼91 degrees, 1st and 2nd stage of Kake(throwing the opponent) was 80∼81 degrees. 2) Knee joint angles at the 1st and 2nd stage in Kake phase(KP) was 64 and 58 degrees in 0% level, and 37 and 39 degrees in max 100% level respectively. 3) Trunk joint angles at the 1st and 2nd stage in Kake phase(KP) was 113 and 96 degrees in 0% level, and 76 and 69 degrees in max 100% level respectively. 4) CM-to-CM angles at the 1st and 2nd stage in Kake phase(KP) was -7 and -5 degrees in 0% level, and -1 and -7 degrees in max 100% level respectively
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증기발생기 세관에서 결함 선단 변화에 따른 와전류 결함신호의 분석
송성진,김의래,김창환,김영환 성균관대학교 기계기술연구소 2001 성균관대학교 논문집 기계기술편 Vol.4 No.1
Eddy current signals from flaws with tip variation in steam generator tubes were analyzed. Using finite element models, abundant flaw signals from two dimensional axisymmetric flaws will tip variation were generated. Features of ECT signal were defined and extracted, and sensitive features for flaw classification and sifting were selected. Two neural networks were employed for flaw characterization and sizing. The intercept vector was introduced as a new feature, and its usefulness was discussed.
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