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ER 유체와 압전작동기를 이용한 엔진마운트의 모델링 및 제어
최승훈,최영태,최승복,Choi, Seung-Hoon,Choi, Young-Tai,Choi, Seung-Bok 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.2
This paper presents a new prototype of an engine mount for a passenger vehicle featuring ER(elector-rheological) fluids and piezoactuators. Conventional rubber mounts and various types of passive or semi-active hydraulic engine mounts have their own functional aims on the limited frequency band in the board engine operating frequency range. However, the proposed engine mount covers all frequency range of the engine operation. A mathematical model of the proposed engine mount is derived using the bond graph method which is inherently domain, the ER fluid is activated upon imposing electric field for vibration isolation while the piezoactuator. Computer control electric fluid for the ER fluid H.inf. cotrol technique is adopted for the piezoactuator. Computer simulation is undertaken in order to demonstrate isolation efficiency of the engine mount over wide operating frequency range.
최세진,전진숙,최영태,Choi, Se-Jin,Cheon, Jin-Sook,Choi, Young-Tai 대한생물정신의학회 2000 생물정신의학 Vol.7 No.2
Objectives : Risperidone is a new antipsychotic drug developed to overcome the therapeutic limitation of conventional antipsychotics. It responses to negative as well as positive symptoms by blocking both dopaminergic and serotonergic receptors, causing no significant side effects such as agranulocytosis and seizure. It is, however, not known whether it induces any serious cardiovascular side effects as evoked by other conventional antipsychotic drugs. The aims of this study were to evaluate the effect of risperidone on cardiovascular function, and to discuss the factors affecting the cardiovascular function. Methods : For 42 patients(22 males and 20 females) diagnosed as schizophrenia, schizophreniform disorder or schizoaffective disorder according to the DSM-IV classification, the cardiovascular fuctions such as heart rate, systolic and diastolic blood pressure, PR interval, QRS interval and QT interval were successively checked before and after 2 weeks and 4 weeks risperidone administration. Furthermore, variables such as body weight, Brief Psychiatric Rating Scale(BPRS), Clinical Global Impression(CGI), Extrapyramidal Symptom Rating Scale(ESRS), Anticholinergic Rating Scale(ARS), serum cholesterol level, serum triglyceride level, serum high-density-lipoprotein level, serum WBC, serum Hb, serum platelet level, prothrombin time and partial thromboplastin time were also analyzed before and after 2 weeks and 4 weeks risperidone administration. Results : 1) Risperidone treatment resulted in a significantly decreased heart rate and increased QT interval after 4 weeks administration(p<0.005 respectively). 2) The scores of BPRS and CGI were significantly decreased after 2 weeks and 4 weeks risperidone administration as compared with baseline(p<0.001 respectively). The scores of ESRS and ASRS were significantly increased after 2 weeks and 4 weeks risperidone administration as compared with baseline(p<0.001 respectively). 3) There were positive correlations between heart rate after 4 weeks and total dose(P<0.05). Blood pressure was significantly(p<0.05) correlated with sex(higher in male) and significantly(p<0.05) positive correlated with body weight. QT interval was significantly(p<0.05) correlated with sex(longer in female) and smoking history(shorter in smokers). Conclusions : Risperidone could induce significant change in heart rate and Q-T interval. Therefore, the cardiovascular safety for risperidone should be reconsidered according to the duration and dosage increase.
한국에서 노인용 미시간주정의존선별검사의 적용을 위한 예비연구
전진숙,오병훈,최영태,Cheon, Jin-Sook,Oh, Byoung-Hoon,Choi, Young-Tai 대한생물정신의학회 1999 생물정신의학 Vol.6 No.1
Objectives : The alcohol dependence in elderly people has been prevalent because of increase in geriatric population. However, it is difficult to find out alcohol dependence in the aged, because they have less specific clinical features as compared with adult alcoholics. The aims of this study were to screen alcohol dependence among elderly Koreans and to know the clinical characteristics of Korean delerly alcoholics. Methods : The questionnaires translated into Korean such as Michigan Alcoholism Screening Test(MAST-K), the Brief MAST and the MAST-Geriatirc Version (MAST-KG) were used to screen alcohol dependence in the elderly alcoholic inpatients aged over 60(N=43), adult alcoholic inpatients within 20-59 Yrs of age(N=60), which were compared with age matched normal healthy aged(N=18) or adult controls(N=45). The demographic data such as sex, age, education, occupation, socioeconomic status, marital status, numbers of children, dwelling and religion as well as alcohol history such as duration of alcohol drinking, onset age, family history, impulsivity, somatic illness and motivation were also obtained to identify characteristic features of Korean aged alcoholics by structured interviews. Results : 1) The aged alcoholics had the charateristic features of more in males, lower age, low education levels, more in blue-collar workers, lower socioeconomic class, more in single, few babies, more living alone, having no religion without statistical significance. 2) The onset age of alcohol dependence was significantly higher in the aged alcoholics($45.3{\pm}13.6Yrs$) than in the adult alcoholics($27.7{\pm}8.7Yrs$)(p<0.0001). The duration of problematic alcohol drinking was significantly longer in the aged alcoholics($22.0{\pm}15.1Yrs$) than in adult alcoholics($14.2{\pm}8.4Yrs$)(p<0.01). Otherwise, there were no significant difference between aged and adult alcoholics in the family history, imulsivity, somatic illness and motivation. 3) The mean score of the MAST-K was significantly higher in the aged alcoholics($20.6{\pm}5.4$) than in the normal aged($6.7{\pm}4.4$)(p<0.0001), which was significantly lower than in the adult alcoholics($26.2{\pm}8.0$) and in normal adult controls($9.5{\pm}3.2$)(p<0.05). The mean score of the Brief MAST was significantly lower in the aged alcoholics($9.3{\pm}3.5$) than in the adult alcoholics($14.5{\pm}6.6$)(p<0.0001). The mean score of the MAST-KG was significantly higher in the aged alcoholics($10.6{\pm}3.5$) than in the normal aged($4.8{\pm}4.3$)(p<0.0001). The former was significantly lower than in the adult alcoholics($12.9{\pm}4.3$)(p<0.005), and the mean score was $4.5{\pm}2.8$ in normal adult controls. 4) The items which showed statistically significant differences between aged alcoholics and normal aged controls could be found in 10 items of the MAST-K(items 2, 3, 4, 5, 11, 14, 17, 21, 22 and 23), 2 items of the Brief MAST(items 2 and 9), and 7 items of the MAST-KG(items 6, 13, 18, 19, 22, 23 and 24)(p<0.01). Conclusions : The scores of the MAST-K, the Brief MAST and the MAST-KG were significantly lower in the aged alcoholics than those in the adult alcoholics (p<0.05). The statistically significant differences between aged alcoholics and normal aged controls could be found in 10 items of the MAST-K, 2 items of the Brief MAST and 7 items of the MAST-KG. Therefore, a briefer rating scales around 10 items are needed to screen alcohol dependence among Korean elderly people.
김한석 ( Han-seok Kim ),서영교 ( Young-gyo Seo ),최영태 ( Tai-young Choi ) 한국폐기물자원순환학회 2007 젊은 연구자 학술연구발표회 Vol.6 No.0
본 연구는 선행연구를 토대로 불소고분자의 구조와 특성을 파악하고 전자빔가속기를 이용하여 폐 PTFE 재활용하여 고부가가치의 제품을 만들기 위한 실험실 규모의 연구를 수행하였다. 전자 빔가속기에서 고에너지를 PTFE에 조사하면 비결정 부분의 주쇄 절단에 의한 저분자화 및 결정 상태 증가로 연성이 사라지고 brittle하게 되어 미 분쇄가 가능하다. 이때 전자빔 조사선량에 따라 개질의 정도에 차이가 있어 요구 되는 입자크기별 분쇄 한계가 결정된다. 입자크기의 정밀 제어를 위해서 분급(사이클론)하고 PTFE powder를 고부가가치 제품에 적용하기 위해서 열분석(열중량 분석기), 주사전자현미경, 입도분석기로 전자빔에너지의 PTFE에 미치는 영향을 살펴보았다. PTFE 스크랩을 조분쇄하여 시료의 크기를 2mm로 조절하고, 빔 에너지 세기를 0.3MeV, 전류량을 1.0mA로 하였으며 시료는 컨베이어 시스템에 의해 이송속도 0.2m/s로 스케닝 방식으로 조사하였다. 조사된 시료의 TGA 실험에서 250℃에서 분해가 시작되었고, 주사전자현미경으로 시료의 형태 및 상태를 관찰 하였고, 입도분석을 통하여 조사선량이 100kGy일 때 평균 입자크기가 약 80pm임을 확인하였다.