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액체식 평판형 태양열 집열기 성능 실험의 표준화에 관한 연구
윤석범 한국산업안전학회 1990 한국안전학회지 Vol.5 No.3
Standardization of solar collector test method is desirable for improvement solar collector quality and Valuation of collector thermal performance. In the present work, test loop proposed by Chun, is modified for convenience of test and obtained accurate collector thermal performance. An experimental investigation has been carried out with a modified collector test loop under a real sun condition in ordor to confirm the utility of modified test loop and study the effect of variation of flow rate on thermal efficiency, the range of optimum flow rate and critical incident angle.
尹錫範 연세대학교 산업경영연구소 1977 산업과경영 Vol.4 No.1
본 논문은 가변수(dummy variables)가 선형회귀모형에 설명변수(explanatory variables)로 포함되었을 때, 가변수계수의 추정량이 해당 회귀오차의 산출평균이 되는 것을 보이기 위한 짧은 주석이 된다. 흔히 가변수라 함은 변수가 크기에 있어서 기수적(cardinal)성격을 갖지 못하거나, 또는 질적인 현상을 설명하는 경우, 변수를 구체적인 크리고 추정하여 표시하는 대신 이진수(binary numbers) 즉 영 또는 1로만 표기하므로서 이질적인 상황만을 구분하고자 할 때 사용되는 변수를 말한다. 경제학에서 다루어지고 있는 통게적 현상이 모두 수량적 개념으로 표시되지 못하고, 때에 따라서는 "그렇다" 또는 "아니다" 등 이분적(dichotomous)인 상황으로 박에는 표시되지 못하는 수가 허다하다. 가변수는 따라서 시계열 자료의 계절적 특이성을 수량적으로 분리한다던지, 전시와 평시의 소비성향을 구분한다던지, 또는 횡단면자료에서 어떤 특정관찰치의 이변적인 성격을 수량적으로 분리하는데 사용되고 있다.
2차원 및 3차원 초음파를 이용한 태아표면의 해부학적 선별 검사에 관한 연구
윤석범,이해혁,이정재,최경훈,이순곤,이임순,이권해 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2
Objective : Our purpose of this study was to determine the clarity and consuming time of fetal surface screening in thirty-eight fetuses from 24 to 32 weeks of gestation by use of two and three-dimensional ultrasonography. Methods : From May 1998 to July 1998, we performed the fetal surface screening of the fetal face, extremities, and spine. Thirty-eight fetuses of 24-32 weeks of gestation (thirty-seven normal fetuses and one abnormal fetus) were studied by use two-dimensional (AI 5200S, 3.5-5.0MHz; Acoustic Imaging Technologic Cooperation, U.S.A.) and three-dimensional ultrasonography (Volusion 530D, 3.5-5.0 MHz ; Kretz-Medicine, Korea). On the fetal face, we evaluated both orbits, nose, lips and brow. Both hands and feet, five digits and toes should be seen in this study. We evaluated cervical spine and lumbosacral junction of the spine. Results : The maternal average age of 38 patients was 29.9 years and the average gestational age was 29.7 weeks. The results of fetal surface screening were as follows : face (both orbits 89.5%, lips 92.1%, nose 92.1%, and brow 89.5%), extremities (both hands 68.4% and feet 73.7%), and spine (cervical spine 94.7% and lumbosacral junction 97.4%) by use of two-dimensional ultrasonography. By use of three-dimensional ultrasonography, results were as follows : face (both orbits 76.3%, lips 81.6%, nose 81.6%, and brow 78.9%), extremities (both hands 76.3% and feet 78.9%), and spine (cervical spine 71.1% and lumbosacral junction 73.7%). Consuming time for two-dimensional ultrasonography were 4.7 minutes for face, 11.6 minutes for extremities, and 5.7 minutes for spine. Using three-dimensional ultrasonography results were 12.8 minutes for face, 17.9 minutes for extremities, and 11.7 minutes for spine. Average consuming time of all fetal anatomic screening was 22.0 and 42.4 minutes by use of two and three dimensional ultrasonography. In one abnormal fetus had cleft lip and polydactyly of right foot which were detected all by three-dimensional ultrasonography, but we couldn't detect the polydactyly by two-dimensional ultrasonography. Conclusion : Three-dimensional ultrasonography was more time-consuming method, but we suggested that three-dimensional ultrasonography was superior than two-dimensional ultrasonography in fetal surface screening.