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Filter Driver 와 NAND FLASH Memory를 이용한 HDD 장치의 성능 개선에 관한 연구
김재경,김우길,김영길,Kim, Jae-Kyung,Kim, Woo-Gil,Kim, Young-Kil 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.8
본 논문에서는 NAND FLASH Memory를 HDD 의 Cache 로 사용하기 위해 I/O 용 Filter Driver의 구현을 제시 했으며, 이를 통해 HDD 저장장치의 느린 I/O 성능을 개선하기 위한 방법에 대해 연구했다. 반도체 부품으로서 빠른 I/O 성능을 보이는 NAND FLASH Memory이지만, 비싼 가격 때문에 HDD를 통째로 대체할 수 없음에서 본 개선 방법을 제안했다. 본 연구는 SSD의 빠른 I/O성능과 Filter Driver 의 Cache 관리 성능을 통해서 적은 비용으로 HDD의 높은 Performance를 이루어 냄을 목적으로 한다. In this paper, we research the method for HDD I/O Performance improvement by Filter Driver & NAND FLASH Memory. This paper was started from NAND Flash Memory can not be replaced by HDD because of high cost. So We consider that using NAND Flash Memory as cache for HDD. It can be achieved high HDD Performance through Filter Driver by low cost.
장결핵 (腸結核 ) 34예에 대한 임상적 (臨床的) 고찰
김상준,김우길,이수석,라성균,장선택 ( Sang Jhoon Kim,Woo Kil Kim,Su Suk Lee,Rha Sung Kyun,Sun Taik Chang ) 대한소화기학회 1974 대한소화기학회지 Vol.6 No.2
Levy and Granmark had introduced double contrast study in 1896 for the first time. Since Daval and Beclere had human experiment of double contrast air study, so many methods for diagnosis of ge.stric diseases are discovered and improved. 'Aiain valuable purpcses for double contrast study of stomach and duodenum are early diagncsis of stomach cBilcer and differectial diagncsis of ulcer forming malignancy frcm benigncy. In ='d ticn to t4ese, differentiation of gastroauoe.al defects, intrin-ic or extrins!c, is also v'orthwlii!e by tl;e metho3 of doub!e cc,ntrast air study of stomach and duodenum. Hvpotonic duodenography is exclusive of misinterpretation of duocenal non lesion in conventi,.nal barium study, as it attributes in cor firmation of nature, extention of lesion, and differer..iation betv;een intrinsic or extrinsic, cr duodenal or papillary lesion in origin, Hypotonic 3uodenogrzphy is helpful in carly diagnosis of disease and avoid misleading unneccessary fv.rther study or explorat- ory laparotomy.
총수담관 결석에 있어서 총수담관 십이지장 문합술과 경십이지장 괄약근 성형술식 비교
김곤홍(Kon Hong Kim),전형천(Heoung Cheon Jeon),김우길(Woo Kil Kim) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.4
N/A There were various reports that the occurrence rate of choledocholithiasis in Korea is higher than Occidental. Therefore, it is predicted that the frequency of retained or recurrent stone after biliary surgery for the choledocholithiasis may be high too, but it can be minimized if we apply more reliable operation method to various conditions of choledocholithiasis. A cornpara- tive retrospective clinical analysis was undertaken to assess the operative results in 100 con- secutive patients with choledocholithiasis who underwent choledochoduodenostomy(CDD group,' 51 cases) or transduodenal sphincteroplasty(TDS group,' 49 cases) during the period from May,1981 through October, 1992. Median duration of follow up was 45 rnonths(range 5 to 128 months) in CDD group and 38 months(range 7 to 98 months) in TDS group. The two groups were comparable with respect to age, operative urgency, associated disease and follow up duration except sex ratio. There was tendency of choice as first time operation in TDS group(82% vs 61%) rather than 2nd or 3rd time operation which were more frequently per- formed in CDD group(p<0.05). Main operative indication was CBD stone with combined IHD stones(61%) in CDD group and was impacted ampullary stone(49%) in TDS group. Mean di- ameter of CBD was greater in CDD group(2.3cm) cornpared to TDS group(1.6cm)(p<0.01). Median operative time and duration of hospital stay were shorter in CDD group compared to TDS group(139minutes vs 174minutes, p<0.001; 13days vs 17days, p<0.05 respectively). There was no difference in change of the postoperative liver function test between two groups. About 60 70% of patients with preoperatively elevated SGOT, SGPT, ALP and bilirubin value were returned to norrnal within 7 days following operations. Early postoperative evalua- tion revealed no differences between the CDD and TDS group with respect to retained stone (16% respectively), wound infection (4% vs 8%)(p=0.63) and operative mortality (2% vs 4 %)(p=0.97), but major and overall morbidity rate were higher in TDS group compared to CDD group (41% vs 20%, and 51% vs 25%, p<0.01, respectively). Late evaluation with long term follow up, showed no differences between the CDD and TDS group with respect to as- cending cholangitis(24% vs 12%, p=0.227), recurrent stone(12% vs 4%, p=0.295). These results lead to the conclusion that CDD is more safer, simpler, less time consuming procedure with short hospital stay and equal effectiveness compared to TDS, but TDS is primarily indicated in patients with impacted ampullary stone and srnall CBD diameter or biliary pancreatitis.(Korean J Gastroenterol 1994; 26: 683 689)