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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.
국내 정신의학 연구에 사용된 심리검사도구에 대한 검토(Ⅰ)
장환일,반건호,김교헌,염태호 大韓神經精神醫學會 1989 신경정신의학 Vol.28 No.4
The purpose of this article is to delineate the trends of the use of the psychological test instruments in psychiatric research. The subjects for the study were 125 scientific articles published in "Neuropsychiatry"(Journal of the Korean Neuropsychiatric Association) from 1985 through 1987. The results were as follows; 1) Psychological test instruments were used in 125 articles among 205 articles which were published in the journal "Neuropsychiatry" for 3 years. The number of psychological test instruments used in 125 articles was 214 ; only one instrument was used in 75 articles and more than 2 instruments in 50 articles. 2) All psychological tests instruments were classified into projective technique, self-report inventory, observation method, intelligence test and unknown. The most commonly used type was the self-report inventory(57.0%). 3) 27.1% of the psychological test instruments were made by the authors themselves;48.1%, already-existing ; 24.8% unclassified. 4) The most common purpose of using thd psychological test, was for the psychodiagnostic tool. Through this study the following problems or questions were raised. 1) Defects in methodology of assessment in psychiatric research(especially when using psychological test instruments) 2) Absent or insufficient explanation about the reason why the psychological test instruments were selected and used in the article 3) Uncertainty in validity and reliability, especially in cases of the psychological test instruments of the author's self-made 4) Insufficient coping method to overcome the weakpoint of the self-report type 5) Various problems resulted from the absence of the clinical psychological in the process of psychiatric research using the psychological test 6) Does the content of the article not depend upon the peculiar psychological test so much? 7) It might be necessary to establish the criteria for classification of psychological test instruments 8) Further study would be necessary to assess the appropriateness and quality of the psychological test instruments used in psychiatric research.
김을환,양태홍,이영자,최한영 서울保健大學 1990 論文集 Vol.10 No.1
This study was performed to investigate the content of a few inorganic metals and the degree of water temperature pH, DO, BOD, COD, SS, TH, Cl^(-), SO_(4)^(-), total alkali and PO_(4)^(3)-P in Singal Lake. In general they are favorable as the water to see but compared with the several terms which are measured in 1976 the pollution of the water increased by five or six times.
이온교환법에 의한 탈질소공정개발의 기초연구 : 회분식 실험 Batch Experiment
이동환,채용곤,김장일,윤태경,주창식,이민규 동의대학교 기초과학연구소 1998 基礎科學硏究論文集 Vol.8 No.1
Ion exchange performance to remove nitrate in water was studied using commercially available strong base anion exchange resin of Cl^- type in the batch reactors. Anion exchange resin was more effective than activated carbon or zeolite. With large resin amount or high temperature or low initial concentration, nitrate removal characteristics for a typical gel-type resin was increased. The curves showed the generally accepted selectivity sequence as SO₄^2-$gt;NO₃^-$gt;NO₂^-$gt;HCO₃^-.