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초가속수명시험(HALT) 및 고장분석을 이용한 실장기판의 신뢰성 향상방안
송병석,조재립,Song, Byeong-Suk,Cho, Jai-Rip 한국신뢰성학회 2004 신뢰성응용연구 Vol.4 No.2
HALT (Highly Accelerated Life Test) was performed to improve the reliability by removing the potential failure for newly developing PCB used for the vibration condition from 2OHz to 2OOHz. During HALT, it is found that the lead of Al electrolytic capacitor of SMD type is detached from PCB. As the result for the failure analysis and FEM (Finite Element Method), it is clarified that the root cause for this failure is the improper attachment of an Al electrolytic capacitor on PCB by the mistake of a PCB design. HALT was performed in previous condition to verify the failure analysis after molding an epoxy resin to overcome the PCB design mistake and it is not observed the same failure. Therefore, it is assumed that the same failure in field will be not occurred by the proper implementation.
광기기 저장매체 구동용 BLDC 모터의 신뢰성 평가기준
송병석(Byeong Suk Song),천성일(Sung il Chan),정해성(Hai Sung Jeong),백재욱(Jaiwook Baik) 한국신뢰성학회 2009 신뢰성응용연구 Vol.9 No.1
BLDC motors are stored in the devices such as CD-RW, COMBO, DVD-ROM and CD-ROM. It is indispensable to establish reliability assessment criteria for BLDC motors, especially in the world where IT grows rapidly. In this article, reliability certification procedure is given. The reliability certification procedure consists of two separate tests such as quality certification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.
자동차 적용기기용 위성정보시스템 모듈의 신뢰성 평가기준
송병석(Byeong Suk Song),황순미(Soon Mi Hwang),천성일(Sung il Chan),정해성(Hai Sung Jeong),백재욱(Jaiwook Baik) 한국신뢰성학회 2009 신뢰성응용연구 Vol.9 No.2
GPS(Global positioning system) system is widely used in artificial satellite, ground controlled approach system as well as in end-user environment such as in the automobile. It is exposed to a very diverse environment and consists of many complicated components and therefore needs careful approach to the enhancement of reliability of the item. In this article reliability standards for the GPS system are established in terms of quality certification tests and failure rate tests.