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초전도 저장장치의 신경회로망 모형 및 이를 이용한 안정도해석 앨고리즘 개발에 관한 연구
林裁尹,張勝燦,金正勳,姜亨求 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
Recently the need of energy storage device such as the pumped-storage has more and more increased in power system in order to aid a side reliability. But it has the problem of environment. As an alternative way of installing it, the Superconducting Magnetic Energy Storage(SMES) is widely study in a power system. Generally the SMES might divide in two class ; the storage use and the stability use. For use in storage SMES never has been construct, because of its expensive cost. Actively progressing the field of the study is for use in stability SMES, so as construction cost is relatively inexpensive. In order to application of the SMES in the power system, it has to be proven of stability efficiency through stability analysis. Stability analysis need modelling of the SMES. The existing model has been used only mathematical model that presented by first order delay time function, so that the SMES has fast response characteristic. But this kind of mathematical model of dynamic system have some problems when stability analysis requests more precision analysis. The problems are the complexity of equation, long calculus time and error of model-decision. For the purpose of settling this problems, this paper proposed an artificial neural network(ANN) methodology to make SMES modelling. ANN is presented using the input-output power characteristics of SMES. when it uses ANN which functions as a model-free system, network construction and parameters determination are carefully chosen to represent the complicated nonlinear input-output relation from the black-boxed SMES system. So far medelling of SMES by ANN never used stability analysis. In this paper, the proposed ANN-based SMES model is applied to analyze the power system stability and the simulation results provide the property of this approach.
노인 뇌경색 환자(70세 이상)의 임상적 특징에 관한 연구
임재환,박형국,성기범,신현길 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1
Stroke is one of the most important diseases in the elderly, but studies on the elderly stroke(age ≥70 years) are rare. The authors evaluated clinical characteristics of ischemic stroke in the elderly and compared them with those in the young(age ≤69). The conclusion obtained are as follows. 1. The strokes with multiple risk factors and combined diseases were more common in the elderly than in the young. 2. Middle cerebral artery territory was most frequently involved in the two groups, but vertebrobasilar territory was more frequently involved in the elderly than in the young. 3. The incidence of recurrent stroke and pathogenesis did not differ significantly between the two groups. 4. Among the complications, urogenital diseases were more common in the elderly than in the young.
프리캐스트 포스트텐션 콘크리트 넓은 보-기둥 내부 접합부의 비탄성 거동
황재환,최윤철,김영찬,김대중,임재형,권기혁,문정호,이리형 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this paper is to evaluate the response of Precast Prestressed Concrete Interior Wide Beam-Column Joint subjected to cyclic lateral loading. To this end, the experimental investigation was performed with six half-scale specimens of interior connection. The design parameters are the beam to column depth ratio, and the number of tendons within column core. One of the specimens, IJH-6, is modeled for the connection at the top floor of a structure. The test results showed that the specimens sufficiently resist up to limiting drift ratio of 0.035 in accordance with the provisional standard by ACI of acceptance criteria for concrete special moment frames.
침 치료가 오십견(五十肩) 환자의 적외선 체열촬영에 미치는 영향
김건형,이로민,남동우,김종인,임사비나,이두익,최도영,이윤호,이재동 경희대학교 동서의학연구소 2006 東西醫學硏究所 論文集 Vol.2006 No.-
Objectives : To observe the effect of acupuncture treatment on Digital Infrared Thermographic Imaging(DITI) in frozen shoulder patients. Methods : 17 voluntary patients received acupuncture treatment on LI15, TE14, GB21 and Master Dong's acupuncture points, Shin-gwanand Gyun-joong, twice a week for 4 weeks. The patients were instructed to practice self exercise during their daily lives. Evaluations were made before treatment, after 1 week of treatment, after 2 weeks, 3 weeks and after 4 weeks of treatment. Constant Shoulder Assessment(CSA), Shoulder Pain and Disability Index(SPADI), Range of Motion(ROM) and the patient's satisfaction concerning the treatment was measured by Visual Analogue Scale(VAS). DITI was measured before treatment and after 4weeks of treatment. The obtained data was analyzed. Results : CSA, SPADI, VAS, adduction and extension showed significant(p<0.05) improvement. Abduction and flexion both improved after 4 weeks of treatment, but the improvement was statistically insignificant(p>0.05). DITI showed improvement but the improvement was insignificant(p>0.05). Conclusion : 4 weeks of acupuncture treatment significantly improved CSA, SPADI, VAS, adduction and extension in frozen shoulder patients(p<0.05). The improvement of abduction and flexion after 4 weeks of acupuncture treatment was insignificant(p>0.05). DITI results improved after 4 weeks of acupuncture treatment. But the change of thermal difference was insignificant(p>0.05).
STWS를 이용한 유도전동기의 토오크 전류측정용 관측기 설계에 관한 연구
심재선,임윤희,김민형 三陟大學校 1997 論文集 Vol.30 No.1
This paper propose a method, observer design for torque current measurement of induction motors, by using single term walsh series(STWS). If the torque currents of induction motors need to know for induction motors driving correctly, it is observed by proposed observer directly. Since the observer which is presented in this paper has an algebraic form, it is more attractive than the conservative others.
愼宰賢,任亨洙,徐大敎 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
One of the recent procedures, the slip line field theory is adopted to find out the exact blank profile for deep drawing square and rectangular cups with a uniform height. The uniformity of drawn cup heights with ideal blanks by this theory is compared with that from other blanks. Drawing forces and thickness distributions are also described experimentally. From this approach, the use of ideal blanks could be suggested to obtain the deeper and the better square and rectangular cups with uniform heights which reduce the trimming allowance to a minimum.