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SAN 기반 공유파일 시스템을 사용한 웹 서버에서의 효율적인 웹 분배 방식에 대한 연구
안철우(Chul Woo Ahn),백광호(Kwang-Ho Baik),황주영(Joo-Young Hwang),김경호(Kyung-Ho Kim),이철(Chul Lee),박규호(Kyu-Ho Park) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
본 논문에서는 SAN(Storage Area Network) 기반의 공유파일시스템인 Asphodel 파일 시스템을 이용하여 클러스터 웹 서버를 구성하였다. 그리고 Asphodel 공유 파일 시스템이 가지는 락(lock) 서버를 이용하여 효율적인 웹 분배정책인 CARD(Cache-Aware Request Dispatch)를 제안하고 이를 설계 구현하였다. 그 결과 후위 서버의 메모리 캐쉬의 적중률을 높임으로써 보통의 분배 정책인 라운드로빈(Round-Robin) 방식에 비해 웹 서버의 throughput 과 latency에서의 성능 향상을 보였다.
춘천 지역에서의 위암 발생률에 관한 연구, 2000-2002년
김성중 ( Sung Jung Kim ),백광호 ( Gwang Ho Baik ),윤광희 ( Kwang Hee Youn ),송성욱 ( Sung Wook Song ),김동준 ( Dong Joon Kim ),김진봉 ( Jin Bong Kim ),민슬기 ( Seul Ki Min ),백일현 ( Il Hyun Baek ),박철희 ( Cheol Hee Park ),장현주 대한내과학회 2007 대한내과학회지 Vol.73 No.4
Background: Stomach cancer is the most common cancer in Korea, and it can be easily diagnosed by performing endoscopy. Helicobacter pylori (H. pylori) is associated with stomach cancer, and there has been much recent interest in the epidemiology of stomach cancer. Therefore, we estimated the incidence of stomach cancer in Chuncheon-si during 2000-2002. Methods: From July 1st, 2000 through June 30th, 2002, we investigated the subjects who were confined to be newly diagnosed cases living in Chuncheon-si. The data was collected from the medical records from all the medical facilities located in Chuncheon-si. Results: The total number of cases of newly diagnosed stomach cancer during this period (2000-2002) was 186 (117 males and 69 females). The annual crude incidence rate of stomach cancer was estimated to be 37.0 per 100,000 persons overall, and 47.0 and 27.2 in the males and females, respectively. The annual age standardized incidence rate for the Korean population was 33.7 per 100,000 persons overall, and 42.2 and 25.1 for the males and females, respectively. The major symptoms of stomach cancer patients were epigastric pain (61.8%) and weight loss (31.2%). The proportion of early gastric cancer was 34.9% (60 among 172 persons) of the cases of stomach cancer. 64 patients (74%) were H. pylori positive. Conclusions: We report here on the estimated incidence rate of the stomach cancer and the characteristics of the stomach cancer patients in Chuncheon-si during 2000-2002. This study has generated basic epidemiologic data to identify the effect of H. pylori eradication on the future incidence rate of stomach cancer.(Korean J Med 73:368-374, 2007)
송성욱 ( Sung Wook Song ),백광호 ( Gwang Ho Baik ),양하나 ( Ha Na Yang ),손경민 ( Kyoung Min Sohn ),김대용 ( Dae Young Kim ),김영묵 ( Young Mook Kim ),윤광희 ( Kwang Hee Youn ),김성중 ( Sung Jung Kim ),김진봉 ( Jing Bong Kim ) 대한내과학회 2008 대한내과학회지 Vol.74 No.6
Background/Aims: Endoscopic heat probe coagulation (HP) and argon plasma coagulation (APC) are considered to be safe and effective for the treatment of peptic ulcer bleeding. The aim of this study was to evaluate the efficacy and safety of APC and HP for treating bleeding peptic ulcer. Methods: Between May 2004 and November 2006 we conducted a prospective randomized trial on 99 patients with peptic ulcer bleeding and for whom a visible vessel or active bleeding was identified. The patients were randomized into two groups: the APC group that was comprised of 56 patients who received argon plasma coagulation and HP group that was comprised of 43 patients who received heat probe coagulation. Results: There were no significant differences between the study groups in terms of age, risk factors, the initial hemoglobin values, the number of patients who showed signs of hemodynamic impairment, the location of ulcer and the bleeding activity. The initial hemostatic rate was 89.3% in the APC group and 93% in the heat probe group (p=0.521). After successful initial endoscopic treatment, rebleeding was observed in 4 cases of the APC group (7.1%) and in 4 cases of heat probe coagulation group (9.3%). Conclusions: Argon plasma coagulation and heat probe coagulation are equally effective for controlling bleeding from peptic ulcer.(Korean J Med 74:611-618, 2008)