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이동진(Dong-Jin Lee),조윤호(Younho Cho),장강원(Kang-Won Jang),조승현(Seung-Hyun Cho),안봉영(Bong-Young Ahn) 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.1
MEMS/NEMS 구조체의 개발과 응용기술의 발달로 박판 및 박막의 기계적 물성 평가에 대한 요구가 점차 늘어나고 있다. 기계적 물성은 주로 인장시험이나 초음파의 속도 측정으로 평가되어 왔으나, 박판/박막 구조의 경우 기존의 기술로는 측정에 한계가 있어 나노압입시험법, 유도초음파법 등의 새로운 기술이 개발되고 있다. 본 연구에서는 박판 구조의 금속재료의 탄성계수를 평가하기 위하여 EMAT으로 송수신된 박판내에서의 유도초음파 진행 속도를 측정하였으며, 이론적으로 계산된 유도초음파 군속도와 실험적인 군속도의 최적화 과정을 통해 최종적으로 박판의 탄성계수를 평가하였다. 두께 50 μm의 니켈 박판에서 측정된 영률은 201.6 GPa이었으며, 나노압입시험법으로 측정된 207 GPa, 참고문헌의 203.7 GPa과 비교하면 약 3% 내에서 일치하는 결과이다. As the development of MEMS/NEMS structure and application technology the demand for an assessment of the mechanical properties have increased. The mechanical properties are mainly evaluated by using tensile test or ultrasonic wave measurement. However, the new technology have been developed such as nano-indentation, guided wave method because they have a limitation in case of a thin plate and thin film. In the study, the guided wave velocities are measured by electromagnetic-acoustic transducer(EMAT), the material properties of thin metallic foils are obtained using optimization process of the theoretical and experimental group velocity of guided wave. The Young"s modulus obtained by the optimization process(201.6 GPa), nano-indentation(207.0 GPa) and literature value(203.7 GPa) of a 50 μm thick nickel thin plate shows good agreement within 3%.
홍봉영(Bong-Young Hong),유규열(Kyu-Yeol Lyu),이대순(Dae-Soon Lee),이재영(Jae-Yeong Lee) 한국정책분석평가학회 2006 政策分析評價學會報 Vol.16 No.3
The purpose of this paper is to evaluate a relative efficiency of operation for defense industries. In this paper, we used DEA model which is possible to evaluate both relative efficiency and its reason for inefficiency. To apply DEA model, we selected top 19 defense industries based on total sales of production, and assumed 3 variables (manpower, fixed assets, material cost) as, an input variable and total sales of production as an output variable. We also proposed a course of action how to apply the result of analysis to improve the way of operation for each industry. This paper is the first application of DEA model to the field of defense industries, and the result of analysis showed that DEA model can be used to the assessment of defense industries.
정상인 20 대 남자에서 Holter 심전도를 이용한 부정맥에 관한 연구
윤봉영(Bong Young Yoon),이정미(Jung Mee Lee),김영조(Young Jo Kim),심봉섭(Bong Sup Shim),이현우(Hyun Woo Lee) 대한내과학회 1991 대한내과학회지 Vol.41 No.4
N/A A 24-hour Holter EK(i was monitored, during ordinary activities, on 51 medical students and interns without heart or other systemic diseases in order to compare the difference of arrythmia between waking and sleeping hours. During waking hours, the mean, maximal and minimal heart rates were 85.8±7.2/min, 144.9±14.2/min, and 52.0±5.9/min, respectively; during sleeping hours, they were 65.2±9.6/min, 128.5±11.6/min, and 47.1±7.3/min. During sleep the mean heart rate was found to be significantly slow. Sinus arrythmia was noted in all subjects without a difference in sleeping and waking periods, and no sinus pause (more than 2.0 seconds) was noted. Twenty subjects (39.2%) showed supraventricular premature beat. Arrythmia was noted in 15 subjects (75%) during waking, 2subjects (10%) during sleeping, and 3subjects (15%) during both waking and sleeping hours. Ventricular premature beat was noted in 13subjects (25.5%), and this arrythmia was noted in 12subjects (92.3%) during waking and 1 subject (7.7%) during sleeping hours. No case developed VPB`s during the sleeping period alone. Atrioventricular conduction defect was noted in 5subjects (9.8%), and all were noted during the sleeping period. Among them Morbitz type I (Wenckebach block) A-V block was noted in 4subjects (80%) and first-degree A-V block in 1 subject (20%).
정봉영,원리숙,이부룡,이채호,Bong Young Chung,Lee Sook Won,Boo Ryong Lee,Chai Ho Lee Korean Chemical Society 1982 대한화학회지 Vol.26 No.2
싱싱한 은행잎으로 부터 새로운 화학성분을 분리하여 그 구조식이 3-(펜타뎃-8-에닐)페놀임을 밝혔다. A new chemical constituent was isolated from the green leaves of Ginkgo biloba L. and identified as 3-(pentadec-8-enyl) phenol.