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윤동우,오성남,김갑일,손영익,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
In addition to accurate position and velocity control, force control is necessary for a successful robot operation. In this paper, we have designed a simple robot gripper using a DC motor. For its force control, a current feedback control law is presented without using additional force sensors. Experimental results prove the effectiveness of the proposed control law. A digital controller is also developed with a TMS320LF2406 processor.
오성남,윤동우,손영익,김갑일,임승철,강환일 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-
This paper aims to provide a way to improve dynamic stability of biped robots against undesirable disturbances and in a slope. By using an angular velocity sensor and an acceleration sensor on its waist, we can make a medium-sized biped robot walk stably in a slope against impulsive disturbances. In addition, it is possible for the robot to walk stably in an unknown slope. The measured signals from the sensor are used for compensating the reference angles of ankle, knee, and pelvis joints. Some experiments show that the stability of the robot is much enhanced by using cheap sensors and a simple algorithm. This work helps biped robots walk more stably in real environments.
직렬과 병렬방식 이중효용 흡수식 냉동사이클의 성능 시뮬레이션
이윤환,오종택,오후규,박기원 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
Condensing the global environmental problems such as CFCs, energy losses in heat recovery systems as well as summer peak time power demands, the development of high efficiency absorption refrigeration systems is one of the most promising method in this problems. In this study, simulation models of both series and parallel type, both using double-effect absorption cycle refrigeration systems. The results summarized as follows : ⑴ In the parallel type, the solution maximum temperature and the pressure of high temperature generator were adjusted by varing the distribution ratio of the solution, and the optimum value was found to be about 0.4. ⑵ The efficiency of the cooling cycle in both parallel and series systems were increased by decreasing the solution circulation ratio in the absorbers, while the solution maximum temperature and high temperature generator pressure were slightly increased.
박옥성,김종환,이광욱,윤성훈,강동구,이승욱,조상기 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Acute myocarditis complicating coronary vasospasm after smallpox vaccination is very rare complication that can be generally developed within less than 30 days after vaccination. Clinically and biochemically, this disorder is often mimic and highly suggestive of acute myocardial infarction. We report 21 years old man that had a history of a smallpox vaccination 3 weeks ago and prodromal symptoms(fever, malaise etc) a few days ago. hIe visited to our hospital because of abrupt onset of severe substernal chest pain, dyspnea and diaphoresis. At admission, electrocardiography was ST elevation in lead Ⅰ, aVL, V4, V5, and V6. The CK-MB level was 68 U/L, LDH level was 760 U/L, Troponin-Ⅰ was 24.64 ng/㎖, and Troponin-T was positive. 2D-echocardiograpy was normal left ventricular function, Clinically we presumed this disorder as acute myocardial infarction and we promptly performed the coronary angiography and revealed focal spasm in distal left coronary artery territory without critical stenosis in both coronary arteries. We diagnosed this disorder as coronary vasospam complicating acute myocarditis that is different with acute myocardial infarction, and we prescribed nitroglycerin and nifedipine. After discharge, he is now well without any symptoms and has been following up monthly at our outward department for 6 months.
양병환,조연규,김창현,황순택,오동열 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.2
The purpose of this study was to examine the content validity of DSM-Ⅲ-R personality disorder(PDs). A 3-point rating scale of 150 preliminary diagnostic criteria including 95 DSM-Ⅲ-R PD diagnostic criteria was sent to psychiatrists. Each item in this scale was rated by psychiatrists(n=101) in term of prototypicality to every DSM-Ⅲ-R PD. The results show that each PD criteria set of DSM-Ⅲ-R was registered high level of interrater consistency and items listed in the DSM-Ⅲ-R were, for the most part, rated as very prototypical to their DSM-Ⅲ-R diagnosis. Some criteria were, however, not rated to characteristic features to their DSM-Ⅲ-R diagnosis. 11 items of DSM-Ⅲ-R diagnostic criteria scored high not only to their DSM-Ⅲ-R diagnosis but also other diagnosis. 16 items rated as high prototypicality item of other diagnosis. Another 16 items seemed not to be appropriate to any of DSM-Ⅲ-R PD diagnosis. These results suggest that the content validity of the DSM-Ⅲ-R personality disorder is not so high.
김정념,이숭환,김정식,김진호,배윤오,박성규,윤상정,한현영,이헌영 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1
Omental infarction, the end result of impaired perfusion to the greater omentum, is a rare benign self-limiting clinical entity. The main clinical symptom is non-specific localized abdominal pain with a moderately raised white blood cell and erythrocyte sedimentation rate. These findings often mimic an abdominal surgical emergency. This condition is often misdiagnosed as acute appendicitis or cholecystitis. The characteristic feature of CT scan and ultrasonography provide non-invasive diagnosis in most patients with omental infarction. We report a case of patient whose CT scan showed the characteristic finding of omental infarction. The patient was improved spontaneously only with conservative care.