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김재이,고영권,전숙희 東新大學校 1999 論文集 Vol.11 No.-
In this paper, various emission patterns of vacuum cleaners were investigated. The typical models of each marker were selected in the study. The frequency and included voltage of EMI(electromagnetic interference) from each vacuum cleaners were measured by using electromagnetic receptor. As the result, we were found that the vertical deflection frequency and induced voltage is about 1~8[㎒] and 6~20[㏈㎶] respectively.
김재이,고영권 동신대학교 환경연구소 2002 환경연구 Vol.7 No.1
오늘날 우리는 많은 정보통신 단말기, 사무자동화기기 그리고 측정기기를 사용하고 있다. 본 논문에서는 가장 대표적인 PA용 CRT 모니터에서 방출되는 유해전자파방출패턴을 조사하였다. 각 제작사의 대표적 모델이 본 연구를 위해 선정되었으며, 각 CRT로부터 방출되는 유해전자파의 유기전압과 주파수는 특별히 제작된 전자파수신기를 사용하여 측정 하였다. 연구결과로서, 메쉬방법을 이용한 EMI차폐 효과는 매우 안전하고 효과적임을 확인하였다. Nowadays, we are using many information and communication apparatus, office automation machinery and tools and measurement instruments. In this paper, various emission patterns of typical cathode-ray tubes were investigated. The typical models of each maker were selected in the study. The frequency and induced voltage of EMI(Electromagnetic interference) from each cathode-ray tubes were measured by using special electromagnetic receptor. As the result, we knew that the EMI shielding effect by mesh method is very effective and safe.
김재덕,임종성,이병권 한국공업화학회 2002 공업화학 Vol.13 No.6
오존층 파괴물질에 관한 몬트리얼의정서에 의해 CFC냉매의 규제가 시작된 이후 새로 개발된 CFC대체냉매에 관한 연구현황과 주요 합성방법을 정리하여 기술하였다. 대체냉매로는 HFC-134a와 R-407C, R-410A 등의 HFC계 혼합냉매, 탄화수소, 이산화탄소 등 자연냉매 등이 많이 사용되고 있다. HFC-134a, HFC-125, HFC-143a, HFC-32 등 현재 많이 사용되는 HFC계 대체냉매의 제조방법은 이미 많은 연구가 진행되었고 차세대 냉매의 개발 및 제조연구는 현재도 계속 이루어지고 있다. Research trend and synthesis methods of alternative of CFC refrigerants which is banned by Montreal protocol that depletes the ozone layer. HFC-134a, HFC mixtures, such as R-407C, R-410A, natural refrigerants, such as hydrocarbons, carbon dioxide etc., were promising replacement of CFC. Many researches on manufacturing methods of HFCs including HFC-134a, HFC-125, HFC-143a, HFC-32, etc. were well carried out. The research on the development and manufacturing techniques of next generation refrigerant is on - going now.
STS요소를 도입한 중학교 과학교육과정 개발 연구 : 물리 영역을 중심으로
박재호,김학수,박은미,백남권 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-
The purpose of this study was to develop an STS curriculum and a sample of STS contents. The materials of daily affairs, social experiment and the interaction of Science-Technology-Society were considered. This study investigated the middle school students' science-related attitude and acknowledgement of STS education. The subjects were 191 students of middle school in Pusan. The results of this investigation can be summarized as following : 1. The science-related attitude investigation showed that many students weren't interested in the science classes, felt tiresome of new scientific introductions and didn't like the science-related works. 2. The acknowledgement-investigation of STS education showed that many students thought science should be related to technology and society, and desired daily affairs to be ralated to materials of the science class.
훈련 받은 집단과 받지않은 집단간의 과학적 창의성 비교 연구 : 국민학교 4·5학년 중심으로
박재호,김학수,김현아,백남권 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-
This study examined the possibility of development of scientific creativity by training, and put on an emphasis if there is any difference in scientific creativity depending on the gender and the grade. The subjects of study are 40 students who trained scientific creativity and 80 students of K elementary school in Pusan : insincerely answered students were excluded and the rest was random sampling according to the gender and the grade. As result of verification of average difference between the trained group of S.C and untrained, the trained group bring out meaningful difference about the flexibility, the fluency, and the originality in some of lower parts of scientific creativity. This proves that scientific creativity can be developed by training. There are no statistically significant difference between the trained group of scientific creativity and the untrained group each other about the distinction of the gender. It proves that scientific creativity is not based on the distinction of the gender. According to the grade, the average of scientific creativity shows that the 5th grade students in the trained group, and the same meaningful difference on the whole. But there is no difference depending on the grade.
양광영,윤성운,김재열,김인권 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
This paper presents experimental and analytical studies of ultimate strength of [30_2/-30_2/90]_s carbon/epoxy laminates with free-edge delamination under uniaxial tension. We performed tensile test for laminates with Telflon inserted on interfaces to simulate initial free-edge delamination. The experiment reveals that extensional stiffness of the laminate decreases by the initiation of the delamination, and that strength of the laminate without delamination is smaller than that of the laminated with delamination. Generalized quasi-three dimentional finite element analysis, which employs energy release rate and maximum stress criteria, predicts the ultimate strength of the laminates with sufficient accuracy.
Serial Ultrasonographic Appearance of Normal Uterus during Estrous Cycle in Miniature Schnauzer Dogs
Kim, Jae-Hong,Park, Chul-Ho,Mun, Byeong-Gwon,Kim, Hee-Su,Kim, Bang-Sil,Lee, Ju-Hwan,Park, In-Chul,Kim, Jong-Taek,Suh, Guk-Hyun,Oh, Ki-Seok 韓國受精卵移植學會 2009 한국동물생명공학회지 Vol.24 No.2
Serial ultrasonography was performed to measure the normal appearance of uterine during estrous cycle and to determine whether the unterine appearance was related to the sex hormone, progesterone and estrogen. The uterine appearances, shape, diameter and echogenicity were daily monitored with ultrasonography in 9 Miniature Schnauzer dogs undergoing II estrous cycles. During proestrus and estrous, the uterus became hypoechoic but developed hyperechoic luminal echo. In the longitudinal view, the shape of the uterus occasionally changed from rectangular to coiled or serpentine, compared to other stages of the cycle. The diameter of the uterus during proestrus and estrous was larger (range: 0.600.86 mm) than other stages (range: 0.480.62 mm) of the cycle. The rising estrogen concentrations (range: 14.5116.86 pg/ml) in plasma during proestrus correlated with changes in the uterus (p<0.05). Progesterone concentrations were 0.080.15 ng/ml at the onset of proestrus, but rose 1.061.26 ng/ml at the end of proestrus. There was no relation to progesterone concentration from onset of estrus (p>0.05). There was dramatical changes in normal uterus and sex hormone during estrous cycle. Especially, the appearance, shape and diameter of uterus were related to plasma estrogen concentration during proestrus, correlated with other stages of the cycle.