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고속 고밀도 디지털 회로에서 사용되는 디커플링 캐패시터의 고주파 모델링과 영향
손경주,김진양,이해영,최철승,변정건 한국마이크로전자및패키징학회 2000 추계 기술심포지움 논문집 Vol.2 No.1
Simultaneous Switching Noise (SSN) propagated through parallel power and ground planes in high-speed multilayer printed circuit boards (PCBs) causes malfunction of both digital and analog circuits. To reduce SSN, decoupling capacitors are generally used in the PCBs. In this paper, we improve the equivalent circuit model of decoupling capacitor in high-frequency range to analyze the effect of SSN reduction accurately. The analysis is performed by the microwave arid RF design system (MDS) method and the finite difference time domain (FDTD) method. We compared the results by the ideal capacitor model with those by the proposed model.
광대역 디커플링 캐패시터 모델을 이용한 정확한 SSN 분석
손경주,권덕규,이해영,최철승,변정건 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.7
고속 다층 인쇄 회로 기판의 전원 평면과 접지 평면을 통해 전파되는 SSN 잡음의 영향을 감소시키기 위하여 일반적으로 디커플링 캐패시터를 사용한다. 본 논문에서는 디커플링 캐패시터에 대한 간단한 고주파 측정 방법 을 제시하고 고주파 기생 성분들을 고려한 광대역 (50 MHz ~3 GHz) 등가 회로 모델을 제안하였다. 제안된 모델은 SSN의 영향을 분석하기 위한 전원 평면과 접지 평면의 SPICE 모델과 쉽게 결합할 수 있다. 제안된 모델이 연결된 회로 해석 결과는 측정 결과와 잘 일치하며, 제안된 모델을 이용한 회로 해석을 통해 디커플링 캐패시터 값에 따른 잡음 감소 효과를 빠르고 정확하게 분석할 수 있음을 확인하였다. Decoupling capacitors are commonly used to reduce the effect of SSN propagated through parallel power and ground planes in high-speed multilayer printed circuit boards (PCBs). In this paper, we introduced a simple high frequency measurement and proposed a wideband (50 MHz ∼3 GHz) equivalent circuit model for decoupling capacitor considering high frequency parasitic effects. The proposed model can be easily combined with the SPICE model of power supply planes far SSN analysis. The circuit simulations with the proposed model show good agreement with the measurement results. Also, we expect to accurately analyze the noise reduction effect as a function of value and location using the proposed model of decoupling capacitor.
손경주(Kyoung-Ju SOHN),서영범(Young-Bum SEO),김철수(Chul-Su KIM),김정규(Jung-Kyu KIM) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The growth behavior of the transverse crack, which was one of the most dangerous damages of rail<br/> defects, was investigated under mode I and mixed mode loading in rail steel. In the case of variable<br/> amplitude loading, the fatigue crack growth behavior was discussed using characteristic stress intensity<br/> factor ranges . In addition, characteristic comparative stress intensity factor ranges was<br/> proposed to evaluate the quantitative effects of the variable amplitude under mixed mode loading. As a<br/> result, crack growth rate under variable amplitude loading was faster than that under constant amplitude<br/> loading.
비대칭 적설하중 적용을 통한 단층 래티스 지붕 구조물의 좌굴하중 특성
황경주,이승재,손수덕 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.3
A single-layerd steel lattice roof, which has 50m span, was constructed. In order to figure out the realistic buckling load level, the structural analysis of this roof structure was performed especially by local snow load. Due to the characteristics of application of snow load, the load combinations of snow should be considered not only global area but also local part so that the critical buckling load could be observed as easy as possible. Geometrical imperfection was simulated to consider inaccurate shape of structure. And then nonlinear analysis were performed. Finally, this paper could investigate that the local snow load with geometrical imperfection decreased the level of buckling load significantly.
군사시설 내 지열 히트펌프 시스템 적용에 따른 에너지 성능과 비용 절감 효과 평가
손병후,조경주,조동우,손병후 한국 지열 · 수열에너지학회 2022 한국지열에너지학회논문집 Vol.18 No.4
The Ministry of National Defense of the Republic of Korea is showing a lot of interest in net zero-energy buildings (NZEBs) to reduce energy consumption of military facilities and to promote green growth policy in military sector. The application of building passive technologies and renewable energies is essential to achieving NZEBs. This paper analyzed energy performance and energy cost on the conventional heating and cooling system (baseline scenario) and three different alternative scenarios (ALT 1, ALT 2 and ALT 3) applied in a hypothetical military building. A building modeling and simulation software (DesignBuilder V6.1) with EnergyPlus calculation engine was used to calculate the energy consumption for each scenario. Overall, when the GSHPs are applied to both space airconditioning and domestic hot water (DHW) production, Alt-2 and Alt-3, the amount of energy consumption for target building can be greatly reduced. In addition, when the building envelope performance is increased like Alt-3, the energy consumption can be further reduced. The annual energy cost analysis showed that the baseline was approximately 161 million KRW, while Alt-3 was approximately 33 million KRW. Therefore, it was analyzed that the initial construction cost increase could be recovered within about 6.7 years for ALT 3. The results of this study can help decision-makers to determine the optimal strategy for implementing GSHP systems in military buildings through energy performance and initial construction cost assessment.