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( Tae Hwan Ha ),( Tae Hoon Oh ),( Sung In Yu ),( Min Kim ),( Jong Wook Kim ),( Won Ki Bae ),( Jae Hyung Kim ),( Seung Suk Baek ),( Mi Jin Ryu ),( Ye Na Choi ),( Ji Young Park ),( Eileen L Yoon ),( Tae 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Non-variceal upper GI bleeding (NVUGIB) is a common medical problem that has signifi cant association with morbidity and mortality. Angiographic detection and subsequent transarterial embolization (TAE) is a primary treatment option when medical and endoscopic treatments fail. We investigated clinical factors that could affect the success of the angiographic detection and prognosis after TAE in patients with NVUGIB refractory to endoscopic therapy. Methods: A retrospective analysis of the clinical data was done in patients with failed endoscopic treatment who underwent angiography for the treatment of acute NVUGIB between May 2002 and May 2013. Patients were divided into detection or non-detection groups according to the presence of bleeding stigmata in angiographic fi nding. Rebleeding defi ned as subsequent bleeding event within 7 days and mortality within 30days were analyzed as outcome parameters after TAE following detection in angiography. Results: A total 45 patients 37 (male, mean age, 65.9±14.9 years) were analyzed and classifi ed as a detection group (n=25, 55.5%) and non-detection group (n=20, 44.6%). Peptic ulcers were the most common cause of refractory NVUGIB. Larger transfusion amount (5.7±3.9 unit vs. 3.5±2.8 unit; P=0.03), prolonged aPTT level (34.2±17.3 sec vs. 21.8±13.8 sec; P=0.01) and short time interval between last endoscopy and angiography (17.5±25.9 hours vs. 34.3±59.5 hours; P=0.04) were found to be signifi cant factors for predicting angiographic detection. TAE was performed in all patients detected in angiography. Rebleeding (44%) was significantly associated with higher Rockall score (8.3±1.5 vs. 6.6±2.4; P=0.046) and mortality (12%) was signifi cantly associated with higher Rockall score (9.3±0.6 vs. 7.1±2.2; P=0.002) and higher level of BUN (55.3±47.4 vs. 27.6±17.4; P=0.01). Conclusions: Clinical characteristics associated with angiographic detection in patients with NVUGIB refractory to endoscopic therapy were severe bleeding, bleeding tendency and early angiographic intervention. The Rockall score is useful parameter for predicting rebleeding and mortality after TAE.
Switched Reluctance Motor의 진동, 소음 특성해석에 관한 연구
정태욱,최태완,이태환 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7
Switched reluctance motor(SRM) drive system is to be compatible for wide range adjustable speed motoring system because it has the same driving characteristics of DC series motor, easy control principle and high efficiency characteristics. By this reason, SRM drive system will be applied to many commercial adjustable speed application that requires economic advantages and high performance abilities. But, SRM drives generate large vibration and acoustic noise because it is rotated by step pulse mmf and switching commutation mechanism. This disadvantage has been obstacles to applicate SRM drives as generalized motor drive system. The main origin of vibration and noise is caused by commutation method which applies step pulse waveform mmf to stator pole and removes the mmf suddenly. This sudden variation of stator flux vibrates stator frame by radial direction and excites natural vibration mode of stator. This paper analyzes the characteristics of vibration and acoustics noise of SRM from the viewpoint of natural mode and driving coidition, and consider the reduction strategy of that.
최종운, 유태환, 김수균, 안성옥 배재대학교 공학연구소 2014 공학논문집 Vol.16 No.1
본 논문은 Unity3D 게임엔진을 이용하여 쉽게 접할 수 있는 아케이드 형식의 미니게임을 제작하는데 목적이 있다. 우리는 미니 게임을 통하여 창의력, 반사 신경을 향상시키도록 하였고, 또한 일상생활에서 볼 수 있는 애완동물이라는 소재를 사용하여, 게임에 접근하기 어려운 사람들에게 친근감을 주게 하는 것을 특징으로 한다. 또한 랭킹 시스템을 도입하여 유저들에게 경쟁을 유도하게 하여 유저들의 게임 참가율을 증대하도록 하였다. 본 논문에서는 Unity3D 엔진을 이용하여, 게임의 개발시간을 단축하여 개발 비용을 줄일 수 있으면서도 게임의 질은 떨어지지 않도록 하였다
하중작용강도 변화에 따른 회전굽힘 피로특성에 관한 연구(2)
안태환 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
This study has been made investigation for the difference of fatigue strength under variable cyclic-rate, compared with three types cyclic-rate 2700cpm, 750cpm and 100cpm using smooth specimens(Kt=1.025) and center holed specimens(Kt=2.02) of SCM 440 steel were obtained through fatigue tests in the rotating. The following conclusions were obtained 1. The specimen(SCM 440) is continuously softened in the field of low cyclic rate. 2. The fatigue strength become high in case of big stress intensity factor. 3. The crack growth life become fast in high stress level. 4. The time of failure can be predicted in the same conditions.
양태홍,이우철,김정래,박승환 서울보건대학 1997 서울보건대학 부설 병원경영연구소 논문집 Vol.3 No.1
Recently, the domestic business of medical equipment have many difficult things in the development and sale of new product. To overcome them, it is needed to solidify the co-work system of industry-education marriage. This paper is undertakened to serve an aid in the field of medical equipment. The analysis of data is attempted through the survey by questionaires, and an object of study is the medical business corporation at Seoul area. As a result to review the data it was identifided that this study is able to be applied to the basis material to reconstruct a right role and phase to medical business Also, it`s expected that we're able to use its results as the educational materials to bring up the more qualified students fit to the industrial need.
간접 혈구응집반응(IHA)을 이용한 간흡충증의 혈청학적 진단에 관한 연구
김태성,주경환,임한종 고려대학교 의과대학 1987 고려대 의대 잡지 Vol.24 No.1
Detection of infections with Clonorchis sinensis has been accomplished through various serodiagnostic procedure including complement fixation test, gel diffusion test, indirect fluorescent antibody test and enzyme linked immunosorbent assay etc. In 1960, Pacheco, et al. reported that indirect hemagglutination test showed relatively more sensitive reaction than CFT in experimentally infected animal and 3 human cases. However, more detailed studies on the use of IHA in serodiagnosis of clonorchiasis were not accomplished. Evaluation of an indirect hemagglutination test was made in 100 egg positive cases in comparison with 51 parasite infected cases other than C. sinensis and 58 parasite free control. Kagan's modification of Boyden technique was employed using ether treated borate buffer extract adult worm antigen with 0.5㎎/ml concentration by Chaffee's method. The results obtained were as follows: 1. Ether treated borate buffer extract adult worm antigen was more sensitive than that of veronal buffered salt extract. 2. Sensitivity of IHA test was 84.0%) among 100 Clonorchs egg positive cases when cut-off titer of 1:16 was applied. Only 1 control sera out of 58 cases(98.3%) specificity) showed positive reaction. 3. Sensitivity was only 80.0% in light infection, 87.1% in moderate infection. However, only 1 case showed false negative reaction among 14 cases in heavy and very heavy infection category. 4. ELISA was more sensitive than IHA test, showing 90.0% sensitivity and 98.3% specificity. 5. Only 2 cases infected with Paragonimus westermani showed positive cross reaction in either IHA test or ELISA. 6. A positive correlation was found between results of ELISA and IHA test of patients with clonorchiasis. And the results obtained in both techniques were same in 86% of positive sera and 100% of negative sera. In conclusion, it is suggested that in addition to ELISA, IHA is a relatively sensitive and reliable test for the sere-diagnosis and sero-epidemiological survey of C. sinensis infection.