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장중순(Joong Soon Jang),엄윤섭(Y . S . Um),최경희(K . H . Choi),이정태(J . T . Lee) 대한설비관리학회 1996 대한설비관리학회지 Vol.1 No.1
N/A An automatic measuring system for scanning jitters of laser beam printers is developed. Scanning jitters are critical defects for high resolution printing. Two types of scanning jitters are possible' horizontal and vertical. Horizontal jitters are mainly
장중순(Joong Soon Jang) 대한설비관리학회 1999 대한설비관리학회지 Vol.4 No.4
N/A FMEA is a widely used tool to assess reliability by identifying potential failure modes or defects at the stage of design and development of products or processes. Performing FMEA has two different objectives: reliability assurance and reliability problem
발전설비 보일러 튜브 용접부의 잔여수명평가 신뢰성 향상을 위한 기계적 물성 변화 연구(SA213-T12)
오병진,장중순,Oh, Byungjin,Jang, Joong Soon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.3
Boiler equipment in power plant is always being operated in harsh conditions and severely exposed to the extreme environment of high temperature. Therefore periodically the state of devices should be checked, diagnosed, and analyzed to ensure the reliability of the equipment. Traditionally, such a diagnosis is based one or two physical properties of the sample taken from the equipment like hardness, microstructure, etc.. However, to enhance the confidence of the diagnosis, it is necessary to synthesize those properties together. This paper is to propose such a synthetic procedure for SA213-T12(1Cr-0.5Mo) which was developed to be used in $565^{\circ}C$ below condition. Creep test and accelerated degradation test were performed simultaneously, and the physical properties such as microstructure, tensile strength, yield strength, hardness, and indentation properties were measured. This paper proposes a method of determining the remaining life by quantitative comparison. It will provide the basis of evaluating life assessment more objective and reliable.
발전설비 보일러 튜브 용접부의 잔여수명평가 신뢰성 향상을 위한 기계적 물성 변화 연구
오병진,장중순,Oh, Byungjin,Jang, Joong Soon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.5
Boiler equipment in power plant is always being operated in harsh conditions and severely exposed to the extreme environment of high temperature. Therefore periodically the state of devices should be checked, diagnosed, and analyzed to ensure the reliability of the equipment. Traditionally, such a diagnosis is based one or two physical properties of the sample taken from the equipment like hardness, microstructure, etc.. However, to enhance the confidence of the diagnosis, it is necessary to synthesize those properties together. This paper is to propose such a synthetic procedure for T23 which was developed to be used in $569^{\circ}C/596^{\circ}C$ condition. Creep test and accelerated degradation test were performed simultaneously, and the physical properties such as microstructure, tensile strength, yield strength, hardness, and indentation properties were measured. This paper proposes a method of determining the remaining life by quantitative comparison. It will provide the basis of evaluating life assessment more objective and reliable.
스크리닝 변수를 이용한 공정 평균 설정 : 검사 오류가 있는 경우
서영대,장중순,Seo, Young-Dae,Jang, Joong-Soon 한국품질경영학회 1994 품질경영학회지 Vol.22 No.4
This study is concerned with determination of an optimal target value in a filling process. Complete inspection procedures are widely used to improve outgoing quality of products. In many cases, however, it may be impossible or noneconomical to measure the quality characteristic, performance variable, directly. In such cases, it is a common practice to select an easily measurable variable which is highly correlated with the performance variable and perform screening products for the variable. This study proposes a model to determine the target value and the inspection rule based on the screening variable. This, study deals with the cases in which rejected products would be scrapped and sold at a reduced price in secondary markets.
형광체 변환 고출력 백색 LED 패키지의 가속 열화 스트레스
천성일,장중순,Chan, Sung-Il,Jang, Joong-Soon 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.4
포화 수증기압이 고출력 형광체 변환 백색 LED 패키지의 열화현상에 미치는 주요 스트레스 인자임을 확인하였다. 또한 LED 패키지의 가속 수명시험을 통하여 포화 수증기압이 효과적인 가속 스트레스 인자임을 확인하였다. 실험조건은 350 mA 전류를 인가한 것과 인가하지 않은 2가지 조건에 대해 $121^{\circ}C$, 100% R.H. 환경에서 최대 168 시간동안 진행하였다. 실험결과 두 실험 모두 광 출력 감소, 스펙트럼 세기의 감소, 누설전류 및 열 저항이 증가하였다. 고장분석 결과 광 특성의 열화는 봉지재의 변색과 기포에 의해 발생한 것으로 나타났다. LED 패키지의 변색과 흡습에 의해 유발되는 기계적 (hygro-mechanical) 스트레스에 의한 기포 발생은 패키지 열화의 중요한 인자로써, 포화 수증기압이 고출력 LED의 수명시험 시간을 단축하기 위한 스트레스 인자로 적합함을 알 수 있었다. We found that saturated water vapor pressure is the most dominant stress factor for the degradation phenomenon in the package for high-power phosphor-converted white light emitting diode (high power LED). Also, we proved that saturated water vapor pressure is effective acceleration stress of LED package degradation from an acceleration life test. Test conditions were $121^{\circ}C$, 100% R.H., and max. 168 h storage with and without 350 mA. The accelerating tests in both conditions cause optical power loss, reduction of spectrum intensity, device leakage current, and thermal resistance in the package. Also, dark brown color and pore induced by hygro-mechanical stress partially contribute to the degradation of LED package. From these results, we have known that the saturated water vapor pressure stress is adequate as the acceleration stress for shortening life test time of LED packages.