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아연처리 볍씨의 발아중 ${\alpha}-Amylase$ 활성과 유리 Proline 함량 변화에 미치는 Kinetin 침종의 영향
김상국,이상철,Kim, Sang-Kuk,Lee, Sang-Chul 한국환경농학회 1997 한국환경농학회지 Vol.16 No.3
The study was carried out to elucidate the changes of ${\alpha}-amylase$ activity and free proline content for zinc toxicity in two rice cultivars(Ilpumbyeo and Namchunbyeo) during germination and early growth stages. Plant height in all kinetin treatments was promoted but zinc 120ppm treatment was decreased. Soaking treatment of kinetin $10^{-3}M$ increased germination rate of both cultivars, Ilpumbyeo and Namchunbyeo by 95% and 96% as compared with zinc 120ppm. Chlorophyll content of Ilpumbyeo was higher than that of Namchunbyeo. Activity of ${\alpha}-amylase$ in kinetin $10^{-3}M$ of both rice cultivars was most highest in the 3days after treatment of zinc 120ppm. Free proline content in all rice cultivars of zinc 120ppm treatment was sharply increased at the 3days after treatment of zinc 120ppm. As a result, the effects of kinetin treatment were recognized to promote the plant height and germination rate under zinc toxicity(120ppm) during rice seed germination and early growth stages.
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수직진동 rheometer를 이용한 전도유체의 점탄성 연구
김상국,김동찬,최영진,조민성,Kim, Sang-Guk,Kim, Dong-Chan,Choe, Yeong-Jin,Jo, Min-Seong 한국재료학회 1996 한국재료학회지 Vol.6 No.11
본 연구에서는 직접 제작된 전도유체(electrorheological fluid)용 수직진동 rhemeter 기기상의 구조 해석 및 실험을 실시하였다. 수직진동 rheomether는 간단하게 제작이 가능하고, 고전압 발생장치를 연결하므로 전동유체의 점탄성 특성을 비교적 쉽게 측정할 수 있다. Rheometer의 구조적 변수와 측정된 힘, 변형 등을 이용하여 복소 점도(complex viscosity), 복소 전단 변형률(complex shear modulus), loss tangent 등의 선형 점탄성 물질 함수를 직접 계산할 수 있으며, corn starch를 polybutene/kerosene에 분산시킨 전동유체를 이용하여 전기장하의 점탄성을 측정하였다.
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분극성을 갖는 미세 입자/유전유체 분산계에서의 전기유변효과
김상국,최윤대,Kim, Sang-Guk,Choe, Yun-Dae 한국재료학회 1993 한국재료학회지 Vol.3 No.2
Abstract Electrorheological effect on the dispersive system of polarizable fine powder/dielectric oil has been investigated. ER effect was explained divided into following 3 mechanisms; (1) surface conductance, (2) bulk conductance, and (3) induced polarization. Mathematical model which predicts the interactive force between two fine particles in the electrorheological fluid has been introduced based on the induced polarization mechanism. This model may provide guide to select materials for strong ER effect. The attractive force between two particles was calculated using the above model for the selected 7 materials such as ceramics, ferrites, polymers etc. From the calculation result, it was found that the ceramics and ferrites are good materials which show a strong ER effect.
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과학기술 정보유통 품질경영시스템(ISO 9001 : 2000)에관한 연구-한국과학기술정보연구원의 ISO 9001 : 2000 인증 사례 연구 -
김상국,이재광,서태설 한국문헌정보학회 2004 한국문헌정보학회지 Vol.38 No.3
a lot of business processes, and the renewed processescontribute new paradigms of the 21th century. As one of the rev olutions, ISO 9000 becomes a standard for developingefficient quality management systems which provide any-time and Thus, it becomes important to research on quality management sy stems for improving quality in information flowingand service domain. In this paper, we describe the applicable d irection and the case study of ISO 9001:2000 whicho help for the quality enhancement. 정보사회에서의 정보혁명은 많은 분야에서 전통적으로 행하던 업무 프로세스의 변화를 가져왔고 이러한 프로세스를 기반으로 21세기 지식정보사회의 패러다임이 새롭게 형성되어가고 있다. 이러한 환경변화 속에서 ISO 9000은 조직의 품질관리시스템을 개발하기 위한 국제적인 표준이 되었다. 효과적인 품질관리시스템은 기업의 제품 또는 서비스가 언제든지 고객의 요한 품질경영시스템의 도입에 대한 연구가 진행되어지고 있다. 본 연구에서는 지식정보의 유통과 서비스에 있어서 질적인 향상을 위한 노력의 일환으로 지식정보 유통·서비스 분야의 품질체계를 확립하는 ISO 9001:2000 인증제도의 도입과 운영에 대한 방향 및 사례를 제시함으로써 지식정보 유통·서비스 품질향상에 도움이 되고자 한다.
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전기유변유체를 동작매체로 하는 실험용 토크 전달장치 제작 및 성능평가
김상국,정동운,최윤대 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10
In this work, an experimental type of torque converter has been constructed and its characteristics have been evaluated by adapting an electrorheological fluid(ERF) as an operating medium. The device was designed by using the equations which were proposed by Carlson et al. The correlation between the rheological behaviour of an ERF and mechanical parameters of the clutch has been investigated. The torque generated by an ERF in this device is sum of one due to the yield strength by polarizing dispersed particles in dielectric oil and one due to the viscous drag. The experimental results are presented in terms of torque and current density as a function of rotational speed at various electric field strength applied. Experimental results showed that the measured torque was rapidly increased with the increase of the electric field, generally being proportional to the rotational speed of the motor. The measured current was shown to be increased with the increased electric field. Also, the current was decreased with the increase of increased with the increased electric field. Also, the current was decreased with the increase of the rotational speed of the motor and reached plateau region after f = 5 Hz.
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