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Wedge 형상을 가지는 덕트의 입구유동 조건변화에 따른 열전달 특성에 대한 연구
유원경(Won Kyung Yoo),양장식(Jang Sik Yang),손창민(Chang Min Son),이성한(Sung Han Lee),안대현(Ahn Dai Hyun),황계하(Kye Ha Hwang),김성하(Sung Ha Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This paper studies the effect of inlet cross flow on the heat transfer in narrow radial ducts with the aspect ratio of 12. Total three geometries, one smooth, two wedged ducts, are modeled for analytical studies. Reynolds number is varied in the range from 13100 to 21000. Ratio of the mass flow rate of main flow and cross flow is maintained to 0.5. Heat transfer characteristics of cross flow are compared to those of no cross flow. Normal-inflow (without cross flow) case results show that area-averaged Nu number of smooth duct is highest. Nu number of Wedge 1 duct is 5% lower than smooth duct and Wedge 2 duct is 21% lower than smooth duct. Cross flow case result also show that area-averaged Nu number of smooth duct is highest. Nu number of Wedge 1 duct is 2% lower than smooth duct and Wedge 2 duct is 18% lower than smooth duct. Cross flow case of smooth duct Nu number is decreased 11% than normal inflow case result, Wedge 1 duct is decreased 8% and Wedge 2 duct is decreased 7%.
호흡기 ; 의료시설폐렴의 임상적 및 세균학적 특성 의료시설폐렴의 임상적 및 세균학적 특성
윤원경 ( Won Kyung Yoon ),김민 ( Min Kim ),김이영 ( Yi Young Kim ),이윤지 ( Yun Ji Lee ),황보엽 ( Yup Hwang Bo ),최금주 ( Keum Ju Choi ),황준현 ( Jun Hyun Hwang ),정승욱 ( Seung Wook Jung ),유승수 ( Seung Soo Yoo ),이신엽 ( Shin 대한내과학회 2010 대한내과학회지 Vol.78 No.6
Background/Aims: Healthcare-associated pneumonia (HCAP) occurs outside hospitals, but its characteristics are similar to those of hospital-acquired pneumonia (HAP). We evaluated the clinical and microbial characteristics of HCAP in Korea. Methods: Of 130 subjects with suspected pneumonia, 49 were classified as HCAP and 81 as HAP. We retrospectively examined the clinical presentations, outcomes, pathogens, and drug resistance rates of Pseudomonas aeruginosae in both groups. Results: The clinical presentations, including the symptoms and laboratory findings, at the time of hospitalization were comparable in both groups. The hospital mortalities of HCAP (28.6%) and HAP (34.6%) did not differ significantly; the length of the hospital stay was similar for all of the survivors (14 vs. 17 days, respectively). Of the identified pathogens, methicillin-resistant Staphylococcus aureus was significantly less common in HCAP than in HAP (two vs. 18 cases, respectively, p<0.01), whereas Klebsiella pneumoniae was more common in HCAP (five vs. zero cases, respectively, p<0.01). The frequency of other Gram-negative rods was similar in both groups. The rate of resistance to antibiotics in P. aeruginosae in both groups was substantial, with the highest resistant rate to ciprofloxacin (50% and 61.5% in HCAP and HAP, respectively). Conclusions: Although the clinical features and outcomes of HCAP were comparable to those of HAP in the study population, the frequency of methicillin-resistant S. aureus was significantly lower in HCAP compared to HAP. (Korean J Med 78:709-716, 2010)
자동 번역용 대용량 번역 지식 DB 관리 시스템 설계 및 구현
장현숙(Hyun-Suk Jang),임점미(Jum-Mi Lim),유원경(Won-Kyung Yoo),홍기형(Ki-Hyung Hong),박상규(Sang-Kyu Park) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1B
본 논문은 영/한, 한/영 자동 번역용 대용량 번역 지식의 효과적인 관리를 위한 시스템 개발이다. 현재 개발 중인 ETRI의 영/한, 한/영 자동 번역 시스템의 개발 환경을 분석하고, gdbm 기반의 번역지식관리의 문제점을 정리하였다. 본 논문에서 제시한 번역 지식 관리 시스템은 클라이언트/서버 구조를 가지는 MS SQL 서버 기반의 시스템이다. 번역 지식은 관계형 DB로 모델링하여 스키마를 설계하고 구현하였다. 관리 시스템에는 기존에 gdbm 파일로 구축해 놓은 지식을 번역지식 DB로 변환하기 위한 이전 도구, 번역지식 DB에 저장된 번역 지식을 검색하기 위한 검색 도구, 번역지식의 삽입, 삭제, 변경을 지원하는 구축도구를 구성된다.