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의약품 유통 관리용으로 사용되는 UHF 대역 RFID Tag의 가속수명시험법 개발
양일영(Il Young Yang),유상우(Sang Woo Yu),박정원(Jung Won Park),조원서(Won-Seo Joe) 한국신뢰성학회 2014 신뢰성응용연구 Vol.14 No.2
RFID (Radio Frequency IDentification) system is recognition technology which can maintain various object’s information. Reliability of RFID tags is the most important factor in RFID system. In this paper, we proposed ALT (Accelerated Life Test) method for UHF RFID tags. Temperature and humidity were adopted as stress factors and the accelerated life tests were conducted in three different conditions. We performed failure analysis for identifying failure mechanism and statistical analysis of test data. In the statistical analysis, we employed Inverse Power law for relationship between tag’s life and stress. Through the statistical analysis, we proposed acceleration factor for several levels of temperature-humidity. The reliability qualification test plans were also designed for the tag’s target reliability.
파렛트 유통관리용 RFID 태그의 신뢰성 평가기준 개발
조완수(Wan-Su Jo),양일영(Il-Young Yang),유상우(Sang-Woo Yu),유환희(Hwan-Hee Yoo) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
RFID(Radio Frequency Identification) tags are used in purpose of pallet supply management. As demand company requires a life expectancy of pallets, it is essential to secure reliability. Tags take lots of influence on characteristic surrounding environmental conditions. This study developed environment test plan and life test plan by analysing field research and standard.
박효빈 ( Hyo-bin Park ),박주민 ( Ju-min Park ),문진석 ( Jin-seok Moon ),유상우 ( Sang-woo Yu ),장유수 ( Yu-soo Jang ),김영종 ( Young-jong Kim ),박진호 ( Jin-ho Park ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
한국의 어린이 10만 명당 교통사고 사망자 비율은 약 1.3명으로 영국 0.5명, 일본 0.7명 등 OECD주요국보다 월등히 높다. 이에 스쿨존에서 어린이 교통사고 예방을 위한 스마트 보행자 안전보장 시스템을 개발하여 보행자와 운전자에게 위험 알림을 통해 사고를 예방할 수 있다.
양일영(Il Young Yang),강준구(Jun Gu Kang),유상우(Sang Woo Yu),오근태(Geun Tae Oh),나윤균(Yoon Gyoon Na) 한국신뢰성학회 2016 신뢰성응용연구 Vol.16 No.3
Purpose: The purpose of this study was to develop the accelerated life test method for Constant Electrical Potential Electrolysis gas sensor (CEPE gas sensor). Methods: The parts and modules of CEPE gas sensor were analyzed by using Reliability Block Diagram (RBD). Failure Mode and Effect Analysis (FMEA) and Quality Function Deployment (QFD) methods were performed for each part to determine the most affecting stress factor in its life cycle. The long term testing was conducted at three different dry heat levels and the acceleration factor was developed by using Arrhenius relationship. Conclusion: The acceleration factor for CEPE gas sensor was developed by using FMEA, QFD, and statistical analysis for its failure data. Also qualification tests were designed to meet the target life.
서동환(Donghwan Seo),강태엽(Tae Yeob Kang),민준기(Joonki Min),이강영(Kang Young Lee),구영권(Young Gwon Gu),이강영(Kang Yung Lee),양일영(Il Young Yang),홍정표(Jeong Pyo Hong),김성규(Sung Kyu Kim),유상우(Sang Woo Yu) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.2
Purpose: Nowadays, it is necessary to ensure that defense systems, which have become very complex and modernized, are highly reliable. To prove the reliability of defense systems, reliability demonstration tests are usually required. The present study develops a method to design reliability demonstration tests for missiles stored in ammunition igloos without maintenance. Methods: The procedure followed herein is as follows. (1) Analysis of operation environments and effective stresses; (2) classification of fault mechanisms and their causes; (3) derivation of an accelerated factor (AF); (4) design of an accelerated test. Results: The reliability target of the missile is B10 : 10 years. Conditions for the test plan are as follows: shape parameter = 1, number of samples = 5, AF = 48.544, and confidence level = 60%. Finally, the test period according to the designed accelerated test plan was 3,139 h. Conclusion: We proposed a method to design reliability demonstration tests for missiles in the development period. The results of this study are expected to contribute to the development of reliable missiles that can be stored for long periods.
조형준(Hyung Jun Cho),백정호(Jung-Ho Baek),여봉기(Bong-Ki Yeu),강태석(Tae-Seok Kang),김길수(Kil-Sou Kim),양일영(Il Young Yang),유환희(Hwan Hee Yoo),유상우(Sang Woo Yu),김용수(Yong Soo Kim) 한국신뢰성학회 2016 신뢰성응용연구 Vol.16 No.2
Purpose: The purpose of this study was to analyze the failure modes of an auto transfer switch (ATS), determine the most common failure mechanisms, and iterate the design to improve reliability. Methods: We carried out failure mode and effect analysis (FMEA) to determine the failure modes and mechanisms. We identified the parts or modules that required improvement via two-stage quality function deployment based on FMEA, and improvements to reliability were monitored using the Gomperz growth model. Results: The main failure modes of the ATS were damage to, and deformation of, the stator / movable element due to repetitive movements. Five iterations of design modification were carried out, and the mean time to failure (MTTF) increased to 14,539 cycles, corresponding to 85% of the target MTTF. The Gompertz growth model indicates that the 10th iteration of design modification is expected to achieve the target MTTF. Conclusion: We improved the reliability of mechanical parts via failure mode analysis, and characterized the iterative improvements in the MTTF using the Gompertz growth model.