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저탄소 Al-킬드강의 연속 어닐링에서 과시효 처리공정 중 탄화물 석출거동에 관한 연구
김성호,한봉희,박용범 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.8
Precipitation behavior of carbides and texture change in a deep drawing sheet steel were studied by heat treating in a production scale continuous annealing line. Effect of annealing, quenching and overaging temperatures were investigated. The site of carbides precipitated during overaging treatments became larger and the Vickers hardness number decreased as the temperatures for quenching and overaging increased. After a overaging treatment at 350℃, finely dispersed plate-like carbides were precipitated in the matrix, white at overaging treatments of 400℃, carbides precipitated along grain boundaries in a form of film and within matrix in a form of coarse particles. The recrystallized structure showed a (111) type texture with the main component of (111) [1 ̄1 ̄2]. The(111) pole intensity and I_(222) I_(200) became higher as the annealing temperature increased within the α-phase region.
가비지 컬렉션과 마모도 평준화 대상 블록의 구분을 위한 블록 소거 횟수 기반 모니터링 기법
김성호,황상호,이명섭,곽종욱,박창현,Kim, Sungho,Hwang, Sang-Ho,Lee, Myungsub,Kwak, Jong Wook,Park, Chang-Hyeon 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.3
In this paper, we propose BCMR (Block Classification with Monitor and Restriction) to ensure the isolation and to reduce the interference of blocks between a garbage collection and a wear leveling. The proposed BCMR monitors an endurance variation of blocks during the garbage collection and detects hot blocks by making a restriction condition based on this information. The proposal induces a block classification by its update frequency for the garbage collection and the wear leveling, so we will get a prolonged lifetime of NAND flash memory systems. In a performance evaluation, BCMR prolonged the lifetime of NAND flash memory systems by 3.95%, on average and reduced a standard deviation per block by 7.4%, on average.