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정동호,탁기덕 동양대학교 2010 동양대학교 논문집 Vol.14 No.1
DC-DC buck converters with closed-loop pulse width modulation(PWM) are strongly nonlinear systems which are potentially chaotic. We investigated experimentally a modified buck converter using low pass filter(LPF) or error amplifier or pulse filtering circuit for conduction noise problems occurring in the output voltage. The proposed circuit is simple and improve efficiency and stability above 50% of duty ratio. In this paper, they reveal high efficiency and smaller ripple voltage for wide industrial application.
Control Graph를 이용한 3차원 개인 얼굴모델 생성
이현철,허기택 한국정보전략학회 2002 한국정보전략학회지 Vol.5 No.1
In this paper, we propose a method of generating an arbitrary person's facial model by using one and/or two photographs which take his full face and profile. Making the generated model shows one's features and characteristics adequately, we manage and adjust control graphs on the characteristic part of face. A node in a control graph is a characteristic point on a part of face, and an edge is a segment which connects two points in the same graph. We can make control easily and fast by adjusting nodes and edges on graphs of the interesting parts only, because each part is defined as a separate graph.
誘導 電動機의 電源 周波數 可變에 의한 最適 制御에 관한 硏究
李五杰,李浚析,鄭基和,禹靖仁 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1
In general, unstable phenomena of induction motor are oftenly appeared at low speed and light load. This paper discribes eigenic unstable regions of I.M. itself by computer simulations and the results are Compared to experimental ones. And also the Optimal design parameters of I.M. which the un-stable region can be minimized are determined.
공단 폐슬러지에 있어서 응집제첨가에 따른 탈수특성에 관한 연구
엄태규,라원식,엄원탁,한기백 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1
To reduce the rate of water contained in the sludge of the industrial wastewater, this study was conducted by comparatively considering the dewatering effect according to addition of coagulant and dewaterability properties of sludge. The result of this study is summarized as follows. 1. The dewaterability properties of sludge presented that the suitable difference in pressure necessary a good dewaterability seems to be 200, 300㎜Hg. 2. When adding an ploymer coagulant to the sludge, its dewaterability properties showed that the higher the rate of addition, the better its dewaterability. Also, it appeared that the adequate rate of addition is about 0.3-0.7% when SS concentration of sludge is 18,000㎎/l, and that is about 0.3-0.4% when SS concentration of sludge is 35,000㎎/l, when this rate is more than 0.5%, it was shown that the dewaterability is insufficient due to both initial moment dewaterability and closing condition of the filter basin. 3. When adding 0.4% ploymer coagulant, the adding rate of inorganic coagulant indicated that the more the added inorganic coagulant, the lower the specific resistance. When the rate of addition is more than 9.0%, however, the filter water indicated a light yellow. For the reason, it is expected that the inorganic coagulant flows out ineffectively. It is expected that the adequate rate of inorganic coagulant addition is between 6.0-9.0%, therefore, while it is better to use both polymer and inorganic coagulant for dewatering the sludge.
Two newly recorded species of Pyraustine moths (Lepidoptera: Crambidae) in Korea
Tak-Gi Lee,Dong-June Lee,Ulziijargal Bayarsaikhan,Hyeong-Kyu Kim,Yeong-Bin Cha,Sol-Moon Na,Young-Min Shin,Bo-Sun Park,Yang-Seop Bae 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The Pyraustinae is one of the large subfamily in Crambidae. In Korea, more than 60 species in 20 genera of the Pyraustinae have been reported. Recently, Demobotys pervulgalis (Hampson, 1913) and Ecpyrrhorrhoe dissimilis (Yamanaka, 1958) were recorded by Choi et al. (2015). Among of the Pyraustinae, the genera Callibotys and Sinibotys were established by Munroe and Mutuura (1969). In this study, we report two species of genera Callibotys and Sinibotys from Korea for the first time, with a newly recorded genus Callibotys. Illustrations of adults, male and female genitalia, description are provided.
First report of the subfamily Cybalomiinae Marion, 1955 (Lepidoptera, Crambidae) in Korea
Tak-Gi Lee,Sol-Moon Na,Dong-June Lee,Ulziijargal Bayarsaikhan,Hyeong-Kyu Kim,Yeong-Bin Cha,Chang-Mun Jang,Yang-Seop Bae 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Cybalomiinae is a small subfamily of the family Crambidae, reporting 18 genera, 122 species in the world. However, this subfamily of species are still included in subfamily Pyraustinae in Korea with two species: Trichophysetis cretacea (Butler, 1879) and T. rufoterminalis (Christoph, 1881). Recently, these species transferred to Cybalomiinae by Shaffer et al. (1996). However, it was not considered in Korea. In the present study, we report the subfamily Cybalomiinae from Korea for the first time, with a newly recorded genus. Illustrations of adults, male and female genitalia, diagnosis, description are provided.