• Title/Summary/Keyword: U.J.S.

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Optimal Design of Heatsink for Inverter System by using Average Method (평균기법을 이용한 인버터 히트싱크 최적화 설계)

  • Jeon J.G.;Cho S.E.;Park N.S.;Park S.J.;Moon C.J.;Kwon S.J.;Kim C.U.
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.539-541
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    • 2006

  • 전력 반도체의 방열 특성은 수명 및 소손과 관계가 있다. 전력 반도체 자체의 열전달 특성 및 전력 반도체가 취부 되는 방열판의 전도, 대류, 방사의 열전달 특성을 고찰하기 위하여 본 논문에서는 실시간으로 방열판의 온도를 관측하여 전력 반도체의 손실을 확인하였고, 프로파일별 히트 싱크 온도 상승 측정 평균 전류와 전류 프로파일과 의 상관 관계를 분석 하여 방열판 최적화 및 히트 싱크 온도 관측 시 히트 싱크의 모델을 제시하였다.

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A Study on the Standard of Test Method for Estimation of Usage Environment Safety and Performance of U-health Medical Device (유헬스케어의료기기의 사용환경 안전성 및 성능평가를 위한 표준시험방법 연구)

  • Park, S.K.;Cha, J.H.;Hur, C.H.;Park, K.J.;Moon, I.H.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.4 no.1
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    • pp.9-14
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    • 2010

  • According to graying of population and income enlargement of people, interest about U-Healthcare of new form fusing with IT technology are enlarged. Need a estimation technology and standard of test method for safety and performance considering usage environment of U-Healthcare medical device. In this research, developed the standard of test method for usage environment safety and performance of U-Healthcare medical device referring IEC standards and KS standards.

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Voltage Comparison-type TCSC Using Recursive Discrete Fouier Transform (순차 프리에 변환(DFT)를 이용한 전압비교형 TCSC TCSC(Thyristor Control led Series Compensation))

  • Ko, S.K.;Park, S.Y.;Park, J.K.
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.79-81
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    • 1993

  • We have proposed a new technology compensating reactance component of line and load. Because capacity of SC is static, it is not appropriate to varing reactance and causes SSR problems. TCSC is introduced for the flecxible control of reactance of SC. If SC voltage is varied when the capacitor current is constant, it can be considered that capacity of SC was varied. SO capacity of SC can be controlled by controlling the voltage of SC. Control reference voltage of SC can be obtained from the condition that sum of reactive powers in all parts is zero.

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Differentially Expression Genes of Normal and Cloned Bovine Placenta

  • Kim, M.S.;Lee, Y.Y.;Park, J.J.;H.Y. Kang;Y.M. Chang;Yoon, J.T.;K.S. Min
    • Proceedings of the Korean Society of Developmental Biology Conference
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    • 2003.10a
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    • pp.82-82
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    • 2003

  • Offspring have been produced from somatic cells in a number of species. This biotechnology introduced a new phenomenon in reprogramming and differentiation of somatic cell, namely totipotency. However, birth of oversized calves and perinatal abnormalities such as increased gestation length, lack of spontaneous parturition, higher incidence of dystocia, and reduced perinatal viability of offspring are frequently observed in pregnancies of cloned bovine fetuses. Disturbance of feto-placenta has been proposed as likely causes for abnomal growth. However. Little is known the mechanism responsible for the perinatal problems. Therefore, we focused on gestation length in somatic cell nuclear recipient cows. To solve this issues, placental tissues of control and cloned bovine were obtained by a cesarean section (C-section) before 5 days of paturition. Total RNA from control and cloned bovine placenta was extractd by TRIzol reagent. GeneFishing DEG kits (Seegene) were used to identify differentially expression genes. Total RNA (3 ug) were synthesized by M-MLV reverse transcriptase (200 u/ul) with 10 uM dT-annealing control primer (ACP1) at 42C for 90 min. Then, first-strand cDNA (50 ng) was amplified using the 5 uM arbitary ACP (1-20) and 10 uM dT-ACP2 primers. Some specific expression genes were amplified, Now, we are cloning and sequencing. These finding strongly can be support to solve the problems for parturition delay in nuclear transfer cows, suggest that placenta specific proteins are key indicators for the aberration of gestation and placental function in cows.

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A Study on Development of the System Model based on u-IT for Landslide Monitoring (급경사지 붕괴 감시를 위한 u-IT 관제 시스템 모델 개발에 관한 연구)

  • Cheon, D.J.;Kim, J.S.;Lee, B.S.;Jung, D.Y.
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.619-620
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    • 2012

  • This paper proposes a model of the real time monitoring system based on Ubiquitous Sensor Network (USN) for the detection and prediction of landslides. For this purpose, the real time monitoring system with tilting sensor and USN was set up and the performance was conducted. The performance was accomplished by conducting both field examinations and the experimental evaluation of the monitoring system. The results of this study show that the movements detected by the sensor module coincide with the actual displacement of field and the data measured from the sensor modules through USN transfer to the monitoring system without errors.

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