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김옥현,이희복,이민기,홍정희,곽용운,Kim, Ock-Hyun,Lee, Hee-Bok,Lee, Min-Ki,Hong, Jeong-Hui,Kwak, Yong-Woon 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
Magnetic fluid seal is characterized by its simple design, low friction and being dustless. Those advantages are deduced from the fact that the sealing element is not a solid such as rubber or plastic but it is a fluid. Those are critical for application to a rotating shaft which is inserted into a vacuum chamber where high level of vacuum and cleanness are required. For the reason the magnetic fluid seal has become a standard for vacuum chambers for semiconductor and LCD processing. It should be noted that its sealing performance is sensitive to temperature. If necessary, water cooling should be considered. Thus anticipation of the temperature distribution of the magnetic fluid seal is important before applying it. In this paper an FEM analysis of the heat transfer has been executed and compared with experimental results. An overall convective heat transfer coefficient has been adopted for the analysis, which results in satisfactory consistency of the theoretical and experimental results.
천연 소재 BF-7의 어린이 장ㆍ단기 기억력 향상 효과
김도희(Do-Hee Kim),김옥현(Ok-Hyeon Kim),여주홍(Joo-Hong Yeo),이광길(Kwang-Gill Lee),박금덕(Geum Duck Park),김대진(Dae-Jin Kim),정윤희(Yoon-Hee Chung),김경용(Kyung-Yong Kim),이원복(Won-Bok Lee),윤영철(Young Chul Youn),정윤화(Yoonhwa C 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.3
본 연구는 BF-7이 어린이의 장기 및 단기 기억을 현저하게 촉진시킴을 보여주었다. 기존 임상 시험 결과를 통해 입증된 바와 같이 천연 소재인 BF-7의 안전성을 고려할 때, BF-7은 어린이 장기 및 단기 기억력, 기억유지도 및 기억의 효과적 활용 등 전반적인 기억 수행 능력 향상에 도움을 주는 매우 안전하면서 효과가 탁월한 천연소재임을 확인하였다. It has been shown that BF-7 enhances short- and long-term memory and attention in normal person. BF-7 was addressed to clinical study for children if BF-7 is also effective to children, since accumulated verification of safety and effectiveness is needed for young ages, in special. We administered BF-7 and a placebo control to two different groups of children (7-12 years old, 9.78 on averages). Their memory enhancement was tested with Rey-Kim Memory Test for Children before and after the administration of BF-7 and a placebo, in a double blinded way. The results showed that long- and short-term memories were significantly improved by the administration of BF-7. Interestingly, the degree of memory preservation, the ability of memory application and awareness of complex thing were also significantly improved. These results indicate that BF-7 is a promising substance from natural resource improving learning and memory of children as well as cognitive function of adults
김옥현 ( Ock Hyun Kim ) 충북대학교 산업과학기술연구소 2016 산업과학기술연구 논문집 Vol.30 No.2
Suppression of vibrations of a car is important for driving safety and comfort. To suppress the vibrations, suspension systems are provided for most of cars. The suspensions have been concerned with only the up-down motion(vertical motion) of cars and the back-forth motion of cars has been ignored. Actually the back-forth motion would be ignored when a car is running. But just after a car stops with deceleration, the back-forth motion is activated and the driver feels more discomfort by the back-forth motion because of its higher frequency. In this study a vibrational model of a car has been suggested to consider the back-forth motion and the model parameters have been estimated by some experiments. Vibrational motions of a car when it stops with some constant decelerations have been simulated. Through the study it is verified that when a car stops with deceleration the back-forth motion occurs much larger than other up-down motion, which may raise necessity of a suspension device to suppress the back-forth motion.
마찰판의 마모 영향을 고려한 건식 클러치의 성능 모델에 대한 연구
김옥현(Okhyun Kim),김상국(Sangkook Kim),임원식(Wonsik Lim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study is analyzed a operation principal of dry-type clutch for development of prediction model of clamp and release operation point. And it is studied factors of dry-type clutch operation point decision, and travel characteristic of operation point with considering the wear. Then, the characteristic change of clamp load-travel and release load-travel are considered. Also, it is developed the performance prediction model of an assembly clutch is equipped with diaphram spring, cushion spring, and so on. The change factor of pressure plate contact point for improvement of clutch control performance of AMT is studied. Finally, it is studied decision process of actuator"s operation force and travel of release system in AMT.
김옥현 ( Ock Hyun Kim ),이규호 ( Kyu Ho Lee ) 충북대학교 산업과학기술연구소 2011 산업과학기술연구 논문집 Vol.25 No.2
This paper contributes to design of a static air bearing. Performance of the air bearing is characterized by its load capacity and consumed air flow rate. Performance of the air bearing has been estimated theoreticallyby a numerical analysis based on the Reynolds equation. For the numerical analysis finite difference formulation of the Reynolds equation has been provided. A prototype air bearing has been designed and fabricated. Its performance of load capacity has been tested and compared with the numerical solutions. The result matches well with each other, which convinces that the numerical approach can be used as an efficient tool to anticipate air bearing performances. Effects of design parameters on the bearing performance have been analyzed by Taguchi’s experimental methods. It is shown that the clearance is the most influential parameter and the next is the number of holes.
김옥현 ( Okhyeon Kim ) 관광경영학회 2020 관광경영연구 Vol.98 No.-
In east asia, confucianism has had a great influence not only on people's minds but also on economic development. This study was designed to understand the impact of confucian values on the sustainability of Korean longevity restaurants(老鋪). The purpose of this study is to derive the Confucian values that influenced the establishment of the core values of longevity restaurant. This can be used as information for building capabilities of restaurant that faced lots of barriers. In-depth interview method was conducted on 9 old korean restaurants with over 50 years of history and family succession. Key findings are following as; (1) Confucian values related to business succession; Filial piety (孝), Patriarchy (家父長制) (2) Confucian values related to business purpose; Righteousness(義) (3) Confucian values related to customer relationship; Benevolence or Human-heartedness (仁) (4) Confucian values related to Organization Membership; familism(家). Finally, based on these research results, academic and practical implications were provided.
김옥현(Ock-Hyun Kim),이희복(Hee-Bok Lee),이민기(Min-Ki Lee),홍정희(Jeong-Hui Hong),곽용운(Yong-Woon Kwak) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.3
Magnetic fluid seal is characterized by its simple design, low friction and being dustless. Those advantages are deduced from the fact that the sealing element is not a solid such as rubber or plastic but it is a fluid. Those are critical for application to a rotating shaft which is inserted into a vacuum chamber where high level of vacuum and cleanness are required. For the reason the magnetic fluid seal has become a standard for vacuum chambers for semiconductor and LCD processing. It should be noted that its sealing performance is sensitive to temperature. If necessary, water cooling should be considered. Thus anticipation of the temperature distribution of the magnetic fluid seal is important before applying it. In this paper an FEM analysis of the heat transfer has been executed and compared with experimental results. An overall convective heat transfer coefficient has been adopted for the analysis, which results in satisfactory consistency of the theoretical and experimental results.