제51차 춘계학술대회 : 증례보고 2 ; 선천성/유전성/대사 : Linear and whorled nevoid hypermelanosis 2예

차정훈,김문범,장호선,오창근,권경술 대한피부과학회 1999 초록집 Vol.37 No.10

제52차 춘계학술대회 : 일반 포스터 ; 화농성 육아종 양상을 보인 Spitz 모반 1예

차정훈,장호선,오창근,권경술 대한피부과학회 2000 대한피부과학회 학술발표대회집 Vol.52 No.1

회수 가능 CANDU 사용후핵연료 처분터널에 대한 열 해석

차정훈,이종열,최희주,조동건,김상녕,윤범수,지준석,Cha, Jeong-Hun,Lee, Jong-Youl,Choi, Heui-Joo,Cho, Dong-Keun,Kim, Sang-Nyung,Youn, Bum-Soo,Ji, Joon-Suk 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.2

Thermal assessment of a new CANDU spent fuel disposal system, which improves the retrievability of the spent fuel and enhances the densification factor compared with the Korean Reference disposal System, is carried out in this study. The canisters for CANDU spent fuels are stored for long term and cooled by natural convection in the proposed disposal system for the retrievability. The steady state thermal analyses for proposed CANDU disposal system are carried out with the ANSYS 10.0 CFX code. The thermal analyses are performed through two steps. At the first step, the sensitivity of the disposal tunnel spacing is analysed. The differences of maximum temperatures by several tunnel spacings are calculated at three points in the disposal tunnel. The result shows that the differences of the temperature at the three points are almost negligible because 99% of the decay heat is removed by natural convection. At the second procedure, 60m tunnel spacing with a ventilation system instead of natural convection is considered. The result is applied to the calculation of the canister surface temperature in disposal tunnel as boundary conditions. Consequently, the average and the maximum surface temperature of disposal canisters are $79.9^{\circ}C$ and $119^{\circ}C$, respectively. The inner maximum temperature of a basket in the disposal canister is calculated as $140.9^{\circ}C$. The maximum temperature of the basket meets the thermal requirement for the CANDU spent fuel cladding.

목질마루바닥재와 벽체용 재료를 이용한 평판열류계법과 MTPS (Modified Transient Plane Source)법의 열전도율 상관관계 분석

차정훈,서정기,김수민 한국가구학회 2011 한국가구학회지 Vol.22 No.2

These days global warming is the most important problem and the most important factor is high emission of carbon dioxide. The 23% of carbon dioxide emission for building construction must be reduced. Thermal conductivity is the most basic factor that can decrease the energy consumption especially insulation. Therefore, an accurate and continuous thermal conductivity measurement can be a way to save energy. In this paper, there are methods about how to investigate thermal conductivity measurements and comparing two methods which are the Heat Flow Meter 436 and TCi.

Prediction from Linear Regression Equation for Nitrogen Content Measurement in Bentgrasses leaves Using Near Infrared Reflectance Spectroscopy

차정훈,김경덕,박대섭,Cha, Jung-Hoon,Kim, Kyung-Duck,Park, Dae-Sup Turfgrass Society of Korea 2009 한국잔디학회지 Vol.23 No.1

Near Infrared Reflectance Spectroscopy(NIRS) is a quick, accurate, and non-destructive method to measure multiple nutrient components in plant leaves. This study was to acquire a liner regression equation by evaluating the nutrient contents of 'CY2' creeping bentgrass rapidly and accurately using NIRS. In particular, nitrogen fertility is a primary element to keep maintaining good quality of turfgrass. Nitrogen, moisture, carbohydrate, and starch were assessed and analyzed from 'CY2' creeping bentgrass clippings. A linear regression equation was obtained from accessing NIRS values from NIR spectrophotometer(NIR system, Model XDS, XM-1100 series, FOSS, Sweden) programmed with WinISI III project manager v1.50e and ISIscan(R) (Infrasoft International) and calibrated with laboratory values via chemical analysis from an authorized institute. The equation was formulated as MPLS(modified partial least squares) analyzing laboratory values and mathematically pre-treated spectra. The accuracy of the acquired equation was confirmed with SEP(standard error of prediction), which indicated as correlation coefficient($r^2$) and prediction error of sample unacquainted, followed by the verification of model equation of real values and these monitoring results. As results of monitoring, $r^2$ of nitrogen, moisture, and carbohydrate in 'CY2' creeping bentgrass was 0.840, 0.904, and 0.944, respectively. SEP was 0.066, 1.868, and 0.601, respectively. After outlier treatment, $r^2$ was 0.892, 0.925, and 0.971, while SEP was 0.052, 1.577, and 0.394, respectively, which totally showed a high correlation. However, $r^2$ of starch was 0.464, which appeared a low correlation. Thereof, the verified equation appearing higher $r^2$ of nitrogen, moisture, and carbohydrate showed its higher accuracy of prediction model, which finally could be put into practical use for turf management system.

제51차 추계학술대회 : 증례 발표 4a ; 종양 2 : 다발성으로 발생한 고전적 Kaposi 육종 1예

차정훈,장호선,오창근,권경술 대한피부과학회 1999 대한피부과학회 학술발표대회집 Vol.51 No.2

2016년도 테니스 그랜드슬램 경기분석

차정훈,권중호 한국스포츠학회 2017 한국스포츠학회지 Vol.15 No.4

본 연구는 테니스 그랜드슬램대회별 남녀 각각 7경기에 대한 경기내용 측정항목에 대한 차이와 남녀선수의 랭킹과 경기내용 측정항목간의 관계를 확인함으로써 국내선수들과 현장지도자들에게 제공함으로써 지도와 훈련에 밑거름이 되는데 그 목적이 있다. 2016년 테니스 그랜드슬램 대회 전호, 전불, 전영, 전미오픈의 남녀단식 8강부터 결승전까지 총 112 경기(남자 56, 여자 56)내용의 결과자료를 이용하였다. 그 결과, Aces, Double faults, Unforced Errors, Winning on 1st Serve, Winning on 2nd Serve, Winners (Including Service), Receiving Points Won(%), Total Point Won, Fastest Serve(KMH), Average 1st Serve Speed(KMH), Average 2nd Serve Speed(KMH)가 남녀선수에 따라 차이가 있었고, 남자선수의 경우, 랭킹과 Winning % on 2nd Serve, Receiving Points Won(%), Net Approaches(%)는 유의한 부적상관을 보였고, 여자선수의 경우, 랭킹과 Aces, Winning % on 1st Serve, Winners (Including Service)는 부적상관을 보였다. The purpose of The purpose of this research is to supply tennis coaches and athletes with research data from international competitions that can be used to teach and aid in the development of training. The object of this research was to analyze the final seven games of each of the four Grand Slam tennis competitions; Australia, Roland Garros, Wimbledon, and the U.S. Open. These were for the men's and women's singles matches starting from the quarter finals through to the finals. We used the statistics program SPSS(Statistics package for the Social Science)WIN Korean version 22.0 for this research. Independent t-test is operated to know the concluding difference between the men and women in performance to significant difference of .05 in the Grand Slam competitions. Spearman's ρ correlation analysis was used to analyze the sample ranking and performance correlation. Therefore, we obtained the following conclusion. First, There were differences performance as related to Aces, Double faults, Unforced Errors, Winning on 1st Serve, Winning on 2nd Serve, Winners (Including Service), Receiving Points Won(%), Total Point Won, Fastest Serve(KMH), Average 1st Serve Speed(KMH), Average 2nd Serve Speed(KMH). There was no difference relating to 1st serve(%) in, Break Point Conversions(%), Net Approaches(%). Second, In regards to male athletes' ranking and performance, there was a direct correlation with Winning % on 2nd Serve, Receiving Points Won(%), Net Approaches(%). In regards to females' ranking and performance, there was a direct correlation with Aces, Winning % on 1st Serve, Winners (Including Service).

여자 초등학생 체질량 성장곡선의 세대간 변화

차정훈,박재현,이동준 한국발육발달학회 2005 한국발육발달학회지 Vol.13 No.1

세대간 변화(secular trend)는 동일지역 혹은 동일특성을 대상으로 장기간 동안의 변화를 의미하는데, 일반적으로 한 세대를 나타내는 20-30년 이상의 변화를 설명할 때 사용되고 있다. 이 연구는 지난 35년(1955년부터 1990년까지)동안 3학년부터 6학년 여자 초등학생의 체질량지수(BMI)가 어떻게 변화되었는지를 규명하기 위한 목적으로 설계되었다. 이 목적을 위하여 여자초등학생의 3학년부터 6학년까지의 종단적 자료와 횡단적 자료가 함께 수집되었다. 종단적 자료는 서울시내 2곳의 초등학교의 건강기록부자료를 통하여 수집되었으며 횡단적 자료는 통계청에서 발행하는 국가 통계자료에 근거하였다. 평균과 표준편차 등의 기술 통계치는 윈도우용 SPSS 11.0을 이용하여 산출하였다. 국가통계자료로부터 얻어진 평균과 표준편차를 다시 개인별 자료로 복원시키기 위해 컴퓨터 시뮬레이션을 수행하였는데, 이때 MS-Excel과 Poptoos 4.1 프로그램을 사용하여 모의실험을 수행하였다. 컴퓨터 시뮬레이션을 통해 재생산된 종단적 자료를 분석하기 위하여 구조방정식모형(Structural Equation Modeling: SEM)에서의 잠재성장모형(Latent Growth Model: LGM)을 적용하였다. 출생년도별로 범주를 나누어 신장, 체중 및 BMI를 구분하여 분석하였다. 이러한 방법을 통하여 얻어진 결과는 다음과 같다. 첫째, 지난 35년 동안 여자 초등학생들의 과체중 및 비만현상은 빠르게 증가하는 것으로 나타났다. 이는 낮은 신체활동환경이 주된 원인으로 판단된다. 신장, 체중과 BMI의 세대간 변화를 보면 각각 출생년도별로 3학년부터 6학년까지의 성장곡선은 다른 것으로 나타났다. 3학년 때 BMI의 출생년도별 차이보다 6학년 때 BMI의 출생년도별 차이가 더욱 커지는 것으로 나타났다. 따라서 3학년부터 6학년 시기에 여자 초등학생의 덩치가 과거보다 점점 커지고 있으며 특히 90년도 출생 여학생의 4학년이후의 체중증가가 두드러지게 증가했다는 사실을 알 수 있다.

유도선수들의 스포츠자신감 수준이 귀인형태에 미치는 영향

차정훈,홍재표,전승훈 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

“디지털 경제”로의 대전환, 핵심 주역은 혁신 스타트업

차정훈 산업연구원 2021 월간 KIET 산업경제 Vol.- No.268