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차량용 연료전지 스택의 안정적 반응 가스 공급을 위한 중앙 유동 분배기 형상 설계에 관한 수치적 연구
정혜미(Jung, Hye-Mi),엄석기(Um, Suk-Kee),정희석(Jeong, Hui-Seok),이성호(Lee, Seong-Ho),서정도(Seo, Jeong-Do),손영진(Son, Yeong-Jin) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
In this study, two types of central flow distributor designs are presented and compared to obtain the optimal compact design which has the least flow resistance and the uniform flow distribution in a vehicular fuel cell stack. For effective and reliable prediction on the thermo-flow characteristics of the reactants flow over the entire fuel cell stack domain, open channel flow in the bipolar plates of the power generating cells were simulated by applying a simplified flow resistance model with an empirical porous concept. A number of case studies were performed to figure out an optimal configuration of a central flow distributor device in terms of the time-dependent thermo-flow behavior and load-dependent flow distribution. The results showed that the stable and load-independent thermo-flow uniformity is very design specific, which is closely associated with the design of central manifolding devices in order to achieve the enhanced volumetric power density and the reliable long-lasting operating of fuel cells.
이상협(Sang Hyup Lee),정희석(Hui Seok Jung),최세영(Se Young Choi),정재동(Jae Dong Chung),이재혁(Jae Hyouk Lee),고기성(Ki Sung Ko),고기남(Ki Narm Ko),명순철(Soon Chul Myung) 대한비뇨기종양학회 2012 대한비뇨기종양학회지 Vol.10 No.2
The metabolic syndrome includes insulin resistance, hypertension and obesity. It is well known as risk factors for cardiovascular diseases. Urologic diseases are also linked to metabolic syndrome. Recent researches note that the metabolic syndrome associated with prostate tumors, hypogonadism, nephrolithiasis, overactive bladder, and erectile dysfunction. Urologists need to be aware of the relationships between metabolic syndrome and urologic diseases. But evidence based data are not enough to understand its associations. The relationships between metabolic syndrome and urologic diseases are very extensive issues. So, in this article we will focus principally on the influence of established aspects of the metabolic syndrome and benign prostate hyperplasia/lower urinary tract symptoms.
웹 로봇 에이전트의 하이퍼링크 분석기법을 이용한 음란메일 차단 시스템의 구현
이승만(Seung-Man Lee),정희석(Hui-Sok Jung),한상(Sang Han),송우석(Woo-Seok Song),이도한(Do-Han Lee),홍지영(Ji-Young Hong),반의환(Eui-Hwan Ban),양준영(Joon-Young Yang) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.1C
이메일은 누구나 쉽게 정보를 교환할 수 있는 편리함 때문에 인터넷에서 가장 중요한 수단으로 사용되고 있다. 그러나 순수한 의사소통의 수단이 아닌 스팸메일의 범람은 성인뿐만 아니라, 어린이 · 청소년에게도 무차별적으로 전송됨으로써 심각한 부작용을 낳고 있다. 본 논문은 점차 지능화 되는 신 유형의 음란스팸메일로부터 청소년을 보호하기 위하여 새로운 방법의 음란메일 차단시스템을 제안하고자 한다. 기존의 스팸메일 차단시스템은 사용자가 직접 음란한 메일이라고 판단되는 메일에 대해 일일이 키워드를 설정하거나, 메일 내용 중에 텍스트만을 추출하여 패턴 매칭방법으로 분류하는 것이 대부분이었지만, 본 논문은 기존 방법의 문제점을 해결하기 위하여 이미지 내 Skin-Color분포의 Human Detection 알고리즘과 웹 로봇 에이전트의 하이퍼링크 분석기법을 사용하였다. 성능 측정결과, 형태소 분석과 Human Detection 알고리즘을 병합하여 적용한 경우 성능 측정에서 90% 정도의 F-measure를 보였지만, 추가적으로 웹 로봇에이전트의 하이퍼링크 분석기법을 병합하여 적용한 경우 97% 이상의 F-measure를 보이며, 신뢰성이 높은 음란스팸메일 차단 시스템을 구현할 수 있다는 것을 증명하였다.
음영욱 ( Young Ook Eum ),김현 ( Hyun Kim ),정희석 ( Hui Seok Jung ),최경석 ( Kyung Suck Cheoi ),이미연 ( Mi Yun Lee ),이원익 ( Won Yik Lee ),손준성 ( Jun Seong Son ) 대한신장학회 2006 Kidney Research and Clinical Practice Vol.25 No.6
Mercury is one of the heavy metals that cause intoxications. Mercury can cause muscular tremor, psychic irritability, renal toxicity and so on. Mercury intoxications usually occur chrough chronic respiratory ingestion. We describe a case in that a woman had applicated inorganic mercury to her whole body and developed mercury intoxications which can be characterized by the whole body skin rash, fever, acute renal failure and the hepatotoxicity appeared. We managed the patient with diuretics, antibiotics and continuous veno-venous hemodiafiltration. On the 6th hospital day, serum creatinine was normalized. Since then, the skin rash and hepatotoxicity were gradually alleviated. (Korean J Nephrol 2006;25(6):1019-1023)
신세포암에서 하대정맥 혈전제거술 중 암색전증 예방을 위한 일시적 하대정맥 내 필터 유치
정희석 외 중앙대학교 의과대학 의과학연구소 2010 中央醫大誌 Vol.35 No.3/4
Patients with renal cell carcinoma (RCC) frequently have tumor thrombus of the renal vein and inferior vena cava (IVC) and the incidence is approximately 4-25%. In case of tumor thrombus invasion in IVC, an active management has been needed, especially radical nephrectomy with thrombectomy. Because the risk of complication such as pulmonary and tumor embolisms is high during manipulation of IVC for tumor isolation at radical nephrectomy, RCC with tumor thrombus into the IVC remains a difficult operative challenge. Placement of a suprarenal "temporary" IVC filter placed at time of radical nephrectomy to eliminate the possiblility of perioperative pulmonary embolus and avoid potential long-term sequelae of a permanent suprarenal IVC filter.