當歸水鍼이 鎭痛效果에 미치는 影響에 關한 硏究

朴快煥,姜成吉 慶熙大學校韓醫科大學韓醫學硏究所 1984 慶熙韓醫大論文集 Vol.7 No.-

지면판위 복수장애물 주위 유동장의 가시화 (Ⅱ)

강성환,김계현,이동환 울산대학교 1992 공학연구논문집 Vol.23 No.1

地面板위에 모양이 서로 다른 복수 장애물을 바람방향과 평행으로 배열한 후(Tandem Arrangement)액체4염화 티타늄은 관찰대상 표면에 직접 도색하여 2차원 및 3차원 유동장을 효과적으로 可視化하였다. 유동장의 動的特性, 즉 박리영역의 양상, 방출 후류의 모양이 구조물의 배치모양과 구조물 사이의 간격에 크게 영향을 받고, 慝히 박리영역 내부의 역유가 확인 되었다. Flow patterns around two-bluff cyliders in the tandem arrangements on a gound plane are effectively visualized using liquid titanium tetrachloride. As results, it was observed that the form of seperated lines on the ground plane and the shedding of vortices from two cylinders were varied with both the gap width anda pair of different cylinders.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

LPF와 반복삽입을 이용한 효율적인 오디오 워터마크 추출

강혜원,이우선,정성환 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

We propose a method to decrease greatly the of original signal and improve efficiency in extraction process by modifying the existent audio watermarking extraction process. In the extraction process, we improve the efficiency of watermark extraction through repeated insertion of watermark and usage of a simple low frequency filter to remove a signal similar to an original signal as a preprocessing. As the result of experiment using some actuality audio data, we get watermark detection rate improvement of about 79%.

UV/TiO₂공정의 최적 운전조건 결정

강성환,전은주,임재명 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-

This research aims to analyze influencing factors and determine optimal operation conditions on UV/TiO₂process for piggery wastewater treatment. Relation between influencing factors and optimum operating conditions were determined by Response Surface Methodology, which was mathematical and statistical method for the modeling of process. The removal rates of TCOD and color increased with increasing temperature, dissolved oxygen concentration, and pH, but decreased with increasing initial TCOD concentration. As the result of RSM, optimum operating conditions TCOD and color removal were temperature of 35~43 ℃. DO concentration of 503~6.3 ㎎/L, less than 110 ㎎/L of initial TCOD concentration, and more than 6.3 of pH. According to RSM modeling, effect of initial TCOD concentration for TCOD and color removal was greatest, and secondly, temperature and DO concentration were influential, and the effect of pH and interaction between influencing factors were negligible. As the result of the comparisons of experimental data with modeling data of RSM, the relationship was very high. 본 연구의 목적은 UV/TiO₂공정에서 돈사폐수의 TCOD와 색도 제거를 위한 영향인자 해석과 최적 운전조건을 반응표면분석이라는 통계적 기법을 통해 도출하는 것이다. 반응표면 분석결과 TCOD와 색도의 제거율은 온도, 용존산소 농도, 그리고 pH가 증가할수록 높아졌으며, 유입 TCOD 농도가 증가할수록 낮아지는 것으로 나타났다. TCOD와 색도 제거율에 미치는 영향은 유입 TCOD 농도가 가장 크고, 그 다음은 온도, 용존산소 농도의 순으로 나타났으며, pH 및 영향인자 상호작용에 의한 영향은 미미한 것으로 나타났다. 또한 TCOD와 색도 제거를 위한 최적 운전조건은 온도 35~43 ℃, 요온산소 농도 5.3~6.3 ㎎/L, 유입 TCOD 농도 110 ㎎/L 이하, 그리고 pH 6.3 이상으로 나타났다. 마지막으로 방응표면분석에 의한 2차 회귀모형을 검증한 결과 모형의 유의성이 매우 높은 것으로 나타났다.

우리 나라에서 재해방지를 위한 개선안 생활변화단위 모형 개발 및 응용

강영식,함효준,양성환 대한설비관리학회 2003 대한설비관리학회지 Vol.8 No.2

The major cause of the industrial accidents is often induced by the human error. It brings about all kind of accidents. Moreover, the more the information and system complicates, the more the human error brings about. So the active accident prevention policy by human behavior, life style, culture, and psychology should develop at this time. Especially, the behavior models have provided the accident proneness concept through the life change unit factors. According to the existing studies on the life change unit models, the oriental behavior models differs from the western model in the life style and ideas. Therefore, the purpose of this paper is to develop the proposed life change unit model by the improved life change unit factors, and to evaluate its application in real fields. The proposed model can be simply applied in real fields in order to minimize the industrial accidents

풍력 발전 시스템의 피치제어

강상수,강승균,임종환,허종철 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1

Wind turbine system converts wind energy into electric energy. Since the velocity of wind is random in nature, control of the angular velocity of the blade is necessary in order to generate high quality electric power. The control of the blade can be divided into the stall regulation type and the pitch control type. The stall regulation type which utilizes an aerodynamic stall is simple and cheap, but it suffers from fluctuation of the resulting power. On the contrary, pitch control type is based on the fact that the torque of the blade can be changed by varying the pitch angle of the blade. It is mechanically and mathematically complicated, but the control performance is better than that of the stall regulation type. This paper derives a mathematical modeling of the wind turbine system, and suggests a pitch control algorithm. The validity of the algorithm is demonstrated with the results produced through sets of experiments.

[논문]용접부의 피로 파손모드 평가에 대한 구조응력기법의 적용에 관한 연구

강성원,김명현,김정환 釜山大學校生産技術硏究所 2006 生産技術硏究所論文集 Vol.65 No.-

반복 하중을 받게 되는 하중전달형의 필릿 용접이음에서는 용접 토우부 뿐만 아니라 용입 부족부 선단에서도 응력집중을 일으키고 피로균열이 발생/ 전파하는 경우가 있다. 특히/ 용접 루트부에서 발생한 균열은 육안관찰이 불가능하고 초음파 탐상등에 의한 비파괴 검사에 의해서도 검출이 곤란한 경우가 많다. 이것은 중대한 손상을 일으키기 까지 방치되는 경우가 많기 때문에 용접 루트부에서 발생하는 균열에 대한 연구는 현재 활발히 진행되고 있다. 본 연구에서는 최근 유한요소 해석시 요소의 크기에 둔감하다고 알려진 구조응력 기법을 이용하여 용입 부족부를 가지는 하중전달형 필릿 용접부의 피로 파손모드를 평가하였다. 용접부 다리길이의 변화에 따른 사례 연구를 통하여 용접 루트부의 파손을 피할 수 있는 용접부 시공기준에 관한 연구를 수행하였으며 이에 대한 구조응력 기법의 적용 가능성을 검토하였다.

24주간 추적하는 임상 연구에서 한국인 남자 알코올 의존 환자의 비재발률

강철중,김성곤,남궁기,조동환,이병욱,최인근,최용성,박성봉,제영묘,김현경,김성연 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.1

Objetives : In order to provide useful data tbr the further clinical studies with Korean alcohol-dependent patients, enrollment and non-relapse rates were investigated while alcohol-dependent patients wcre followed up for 24 weeks. Methods : The subjects of this study were alcohol-dependent male patients who, for the first time, visited a hospital among 3 groups of hospitals, University Hospital, General Hospital or Mental Hospital, or those who needed to be followed up after discharge from those hospitals. After assigning 12 subjects to each hospital, we investigated enrollment and non-relapse rates while cognitive-behavioral therapy and pharmacotherapy were provided. Results : 1) Forty-eight patients were enrolled and the rate of enrollment was 36.4%. The enrollment rate in the University Hospital group was 52.1%, in the General Hospital group 50.0%. and in the Mental Hospital group 10.4%. 2) In 48 patients, non-relapse rate was 27.1% at 12 week and 18.8% at 24 weeks after starting follow-up. It was 24.4% and 20.0% at 12 and 24 weeks, repectively, in the University Hospital group while the General Hospital group showed 33.3% and 16.7%, respectively, and the Mental Hospital Group showed 20.0% at both 12 and 24 weeks. Conclusion : These results provide important data for further clinical studies of Korean alcohol-dependent patients.

특징 영역 기반의 칼라 얼굴 영상 인식

강영미,정성환 國立 昌原大學校 精報通信硏究所 1998 精報通信論文集 Vol.2 No.-

In this paper, a face recognition system is proposed, which extracts the feature region in a color face image an recognizes a face using neural net. First, we transform RGB color model into HSI and seek a facial region by hue component range. Next, using Wavelet transform, we remove unnecessary details and extract a feature region. Finally, we recognize the face of an extracted feature region using ART2 neural net. The proposed method does not require individual feature extraction because a feature region preserves its detailed information for each face. It can also process the information in Wavelet transform domain. Therefore, the proposed method can extract features efficiently in large image databases. In the experiment with 150 facial images, the proposed method shows about 93% recognition rate.