• 한국강구조학회 논문집
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• 제16권1호통권68호
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• pp.145-153
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• 2004

기존교량의 내진성능개선 및 신설교량의 지진보호에 납-고무 베어링은 좋은 효과를 보여주고 있다. 그러나 납-고무 베어링은 사용상에 있어 문제점이 있으며, 이를 개선하기 위하여 형상기억합금(shape memory alloy)을 이용한 면진장치를 본 연구에서 제시하였다. 3경간 연속 고속도로 강교량의 지진해석을 통하여 납-고무베어링과 고무베어링 및 형상기억합금 와이어와의 조합 면진장치의 지진거동을 비교하였다. 해석결과 형상기억합금 와이어+고무베어링 시스템이 납-고무베어링과 거의 유사한 거동을 보여주었으며, 특히 제시된 면진장치는 상대변위의 제어 및 잔류변형에 있어 기존의 납-고무 베어링에 비해 성능이 우수했다.

• 한국진공학회지
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• 제15권3호
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• pp.273-279
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• 2006

Si기반 고주파집적회로의 차단재로서 간접전극 양극산화법으로 형성된 다공성 Si을 활용하기 위한 기초 연구로서 전류밀도, 시간에 따른 기공의 크기와 깊이등을 조사하였고 기공 도입 전,후 Si의 격자상수 변화를 측정하여 유발되는 내부응력의 크기를 평가하였다. 기공의 크기와 깊이는 대개 전류밀도와 시간에 따라 증가하였다. 기공이 형성됨에 따라 Si의 격자상수가 증가하여 약 8MPa의 압축응력이 유발되었다. 간접전극 양극산화법으로 형성된 다공성 Si은 공정이간단하고 기공으로 유발되는 내부응력의 크기가 작아 Si YLSI공정 적합성이 우수하므로 고주파 직접회로의 효과적인 차단재로서 적합한 재료로 판단된다.

• 한국추진공학회지
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• 제20권4호
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• pp.87-93
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• 2016

직접 연결식(DC) 고도모의 엔진시험 수행 시, 공기 흡입 덕트와 항공용 엔진 사이에 래버린스 씰이 설치된다. 래버린스 씰은 이 둘을 기계적으로 격리시킴으로써 주추력 및 측추력을 보다 정확하게 측정할 수 있도록 돕는다. 하지만 덕트 내부 공급공기에 높은 수직 온도구배가 발생할 경우, 래버린스 씰의 격리가 파괴되어버린다. 본 논문에서는 이러한 접촉 문제를 해결하기 위한 노력의 일환으로 래버린스 씰 온도 제어장치를 제작/설치하였다. 본 장치를 실제 항공용 엔진시험에 적용한 결과, 높은 수직 온도구배가 생성되어도 래버린스 씰의 격리가 잘 유지되는 것을 확인할 수 있었다.

• 전기전자학회논문지
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• 제27권3호
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• pp.303-307
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• 2023

본 논문은 Buried Channel Array Transistor(BCAT) 소자의 Oxide 내부에 Total Ionizing Dose(TID) effects으로 인한 Electron-Hole Pair의 생성이 유도되어, Oxide 계면의 Hole Trap Charge의 증가에 따른 누설전류의 증가와 문턱 전압의 변화를 기존에 제안한 Partial Isolation Buried Channel Array Transistor(Pi-BCAT)구조와 비교 시뮬레이션 하여, Pi-BCAT 소자의 증가한 Oxide 면적과 상관없이 변화한 누설전류와 문턱 전압에서의 특성이 비대칭 도핑 BCAT 구조보다 우수함을 보여 준다.

• 전자공학회논문지A
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• 제31A권12호
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• pp.106-114
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• 1994

The local oxidation of silicon (LOCOS) technology, which uses a silicon nitride film as an oxidation mask and a pad oxide beween the silicon nitride and the silicon substrate, has been widely used in integrated circuits for process simplicity. But, due to long brid's beak length, there are difficulties in scabilities. Many advanced isolation techniques have been wuggested for the feduction of bird's beak length. In this paper, we presented reduced bird's beak length using the polybuffered oxide and the silicon nitride as the sidewall. Also, investigating the electrical behavior of the parasitic Al-gate MOSFET on LOCOS, we proved the validity for new isolation process.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.900-903
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• 2014

Fly-wheel, Gimbal antenna, CMG, Spaceborne cyrocooler generate micro-vibration during their on-orbit operation as well as implementing their own function. To comply with the mission requirement of high resolution observation satellite, additional technical efforts have been required to isolate the micro-vibration derived from such payloads by applying the vibration isolator. In this study, we proposed a passive isolator using SMA mesh washer, which guarantees the structural safety of both micro-vibration disturbance source and itself under harsh launch vibration loads without an additional holding mechanism and the micro-vibration isolation performance on orbit environment. To verify the micro-vibration isolation performance of the proposed vibration isolator, we performed the micro-vibration isolation measurement test using the dedicated micro-vibration measurement device proposed in this study.

• 국제초고층학회논문집
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• 제11권3호
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• pp.207-219
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• 2022

During the structural design of urban over-track high-rise buildings, two problems are most likely encountered: the abrupt change of story stiffness between the podium and the upper towers, as well as the demand for train-induced vibration control. Traditional earthquake-resistant structures have to be particularly designed with transfer stories to meet the requirement of seismic control under earthquakes, and thus horizontal seismic isolation techniques are recommended to solve the transfer problem. The function of mitigating the vertical subway-induced vibration can be integrated into the isolation system including thick rubber bearings and 3D composite vibration control devices. Engineering project cases are presented in this paper for a more comprehensive understanding of the engineering practice and research frontiers of urban over-track high-rise buildings in China.

• IEIE Transactions on Smart Processing and Computing
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• 제5권3호
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• pp.164-168
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• 2016

A low insertion-loss, high-isolation switch based on single pole double throw (SPDT) for a 2.4GHz Bluetooth low-energy transceiver is presented in this paper. In order to increase isolation, the body floating technique is implemented. Based on characteristics whereby the ratio of the sizes of the shunt and the series transistors significantly affect the performance of the switches, the device sizes are optimized. A simple matching network is also designed to enhance the insertion loss. Thus, the SPDT switch has high isolation and low insertion loss without increasing the complexity of the circuit. The proposed SPDT is designed and simulated in a complementary metal-oxide semiconductor 65nm process. The switch has a $530{\mu}m{\times}270{\mu}m$ area and achieves 0.9dB, 1.78dB insertion loss and 40dB, 41dB isolation of transmission, reception modes, respectively.

• 한국공간구조학회논문집
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• 제18권3호
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• pp.105-116
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• 2018

The objective of this study is to investigate the response reducing effect of a seismic isolation system installed between 300m dome and supports under both horizontal and vertical seismic ground motion. The time history analysis is performed to investigate the dynamic behavior of single layer lattice domes with and without a lead rubber bearing seismic isolation system. In order to ensure the seismic performance of lattice domes against strong earthquakes, it is important to investigate the mechanical characteristics of dynamic response. Horizontal and vertical seismic ground motions cause a large asymmetric vertical response of large span domes. One of the most effective methods to reduce the dynamic response is to install a seismic isolation system for observing seismic ground motion at the base of the dome. This paper discusses the dynamic response characteristics of 300m single layer lattice domes supported on a lead rubber seismic isolation device under horizontal and vertical seismic ground motions.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.132-138
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• 2013

Natural gas as a clean fuel of the world demand for the trend is gradually increasing demand for clean energy in the country and there is growing interest. Therefore, LNG storage tanks and related facilities in the country of the importance of leading a community-based facility has emerged. So common sense that an earthquake with a seismic isolation device LNG storage tank similar to the actual behavior of the analytical model which can describe the development and construction of storage tanks to enhance the safety and economic design techniques need to be developed. In this study, a base isolation system, seismic analysis procedure of LNG storage tanks, and Triple-FPB developed a mathematical model of the present crystallized and complexity factors to the sum over histories model simplifies the complex behavior of the LNG storage tank with base isolation system how to interpret the seismic isolation is proposed.