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고장물리 기반 수중 매설형 PBA에 대한 신뢰성 설계 연구
김지영(Ji-Young Kim),이기원(Ki-Won Lee),윤홍우(Hong-Woo Yoon),이승진(Seung-Jin Lee),허준기(Jun-Ki Heo),권형안(Hyeong-Ahn Kwon) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.4
Purpose: PBA buried in underwater requires high reliability because of its mission critical characteristic and harsh operational environment during its life cycle. Therefore, various reliability improvement activities are necessary. The defect on PBA manufacturing process have been studied, as a result, many activities and standards have been presented. However, there are less studies regarding failure pattern on physical features based on design. In this paper, we studied a possible failure patten based on physical features that is related with manufacturing process of PBA. And reliability improvement design based on PoF (Physical of Failure) were intruduced in this paper . Methods: A reliability prediction simulation were performed on the components A and B of the H system using Sherlock Software which is a PoF commercial tool from DFR solution. Solder fatigue and PTH fatigue analysis based on thermal cycling profiles and random vibration was analyzed on three earthquake response spectrum. Result: It was validated that life time and reliability improvement design through solder fatigue and PTH fatigue analysis in case of component. For compoenet B, random vibration fatigue was additionally analyzed and validated reliability for earthquakes profile. Conclusion: In design stage prior to manufacturing, PoF can be analyzed, and it is possible to make a reliability improvement/validated design using design data. This study can be applied in every design step and contribute to make more stable development product.
300톤 급 미만 선박용 VHF 대역의 비상 조난신호 발생기 구현
왕철용(Chul-Yong Wang),조재형(Jae-Hyoung Cho),최민호(Min-Ho Choi),허준기(Jun-Ki Heo),이원부(Won-Boo Lee),박동국(Dong-Kook Park) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
본 논문에서는 300톤 급 미만 선박에서 사용가능한 VHF 주파수 대역의 EPIRB(비상 조난신호 발생기)를 구현 하였다. MCU를 이용하여 회로 각단을 제어하고 Sea Water Contact Switch가 물에 잠기게 되면 Voice Recoder에서 음성신호가 발생 되여, 이 신호를 송신기의 반송파에 실어 방사되는 시스템을 구현하였다. In this paper, EPIRB(Emergency Position Indicating Radio Beacon) is designed to be used for the less than 300 ton vessels using VHF Frequency band. This system is controlled by MCU which controls each parts. And when Sea Water Contact Switch contacts water, the transmitter radiates a carrier wave mixed analog signal which is generated at Voice Recorder.
300톤 급 미만 선박용 VHF대역의 비상 조난신호 발생기 구현
왕철용(Chul-Yong Wang),조재형(Jae-Hyoung Cho),최민호(Min-Ho Choi),허준기(Jun-Ki Heo),이원부(Won-Boo Lee),박동국(Dong-Kook Park) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
본 논문에서는 300톤 급 미만 선박에서 사용가능한 VHF 주파수 대역의 EPIRB(비상 조난신호 발생기)를 구현 하였다. MCU를 이용하여 회로 각단을 제어하고 Sea Water Contact Switch가 물에 잠기게 되면 Voice Recoder에서 음성 신호가 발생 되여, 이 신호를 송신기의 반송파에 실어 방사되는 시스템을 구현하였다. In this paper, EPIRB(Emergency Position Indicating Radio Beacon) is designed to be used for the less than 300 ton vessels using VHF Frequency band. This system is controlled by MCU which controls each parts. And when Sea Water Contact Switch contacts water, the transmitter radiates a carrier wave mixed analog signal which is generated at Voice Recorder.
이중 공진을 고려한 소나 트랜스듀서의 전기적 등가회로 모델링 및 임피던스 변동에 따른 효과 분석
목형수(Hyung-Soo Mok),최재혁(Jae-Hyuk Choi),한수희(Soo-Hee Han),박상준(Sang-Zoon Park),김성주(Sung-Joo Kim),허준기(Jun-Ki Heo) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.2
The present study proposes a method for modeling a SONAR transducer with dual resonance. The Butterworth van-Dyke (BVD) model, a conventional SONAR transducer modeling method, can model only one resonance point. Hence, to address its disadvantage and to model the dual resonance, a dual resonance BVD model consisting of two serial BVD models is proposed. The two BVD models are connected in a series, and each simulate resonance at low frequency and high frequency, which allows the modeling of two resonance points. Eight elements compose the equivalent circuit by connecting the BVD models in a series, which is twice as great as that of the existing BVD model. The element value of the dual resonance BVD model is extracted by using the particle swarm optimization method. Analysis was also performed to identify the effects of changes in the value of elements that compose the equivalent circuit on the impedance characteristics of the equivalent circuit through simulation in which element values varied.