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李鍾豪(Jong-Ho Lee),趙浚東(Jun-Dong Cho),表正烈(Jung-Yul Pyo),朴基豪(Gi-Ho Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
In this paper, we propose a new cache structure for effective error correction of soft error. We added check bit and SEEB(soft error evaluation block) to evaluate the status of cache line. The SEEB stores result of parity check into the two-bit shit register and set the check bit to '1' when parity check fails twice in the same cache line. In tills case the line where parity check fails twice is treated as a vulnerable to soft error. When the data is filled into the cache, the new replacement algorithm is suggested that it can only use the valid block determined by SEEB. This structure prohibits the vulnerable line from being used and contributes to efficient use of cache by the reuse of line where parity check fails only once can be reused. We tried to minimize the side effect of the proposed cache and the experimental results, using SPEC2000 benchmark, showed 3% degradation in hit rate, 15% timing overhead because of parity logic and 2.7% area overhead. But it can be considered as trivial for SEEB because almost tolerant design inevitably adopt this parity method even if there are some overhead. And if only parity logic is used then it can have 5%~10% advantage than ECC logic. By using this proposed cache, the system will be protected from the threat of soft error in cache and the hit rate can be maintained to the level without soft error in the cache.
김광준(Gwang Jun Kim),최수란(Su Ran Choi),이순표(Soon Pyeu Lee),황병철(Byung Chul Whang),이의돈(Eyi Don Lee),김석영(Suk Young Kim),윤성준(Sung Jun Yoon),한은애(Eun Hye Han),안정렬(Jung Rerl Ahn),최유덕(Yu Duk Choi),최승헌(Seung Hyun 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.6
Objective : To analyze cytogenetic results of prenatal genetic amniocentesis. Methods : From January 1997 to December 2000, We analyzed 1,390 cases of midtrimester amniocentesis which were done at Gil medical center of Gachon medical school according to its indications and maternal age. Results : Chromosomal aberrations were found in 88 cases (6.3%). Of all our chromosomal aberrations, 29 cases (2.1%) of normal variants and 59 cases (4.2%) of abnormal karyotypes were found. 37 cases of autosomal numerical abnormal karyotypes and 7 cases of sex chromosomal abnormal karyotypes were diagnosed. In abnormal karyotype group, the incidence was high after 40 years of maternal age and in abnormal ultrasound findings, but no such correlations were found in normal variant group. Conclusion : In analysis of midtrimester amniocentesis, it would be better to analyze separately abnormal karyotype group and normal variant group.