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5MW급 해상풍력발전시스템용 Suction Caisson 하부구조물 적합성 연구
김용천(Kim, Yong-Chun),정진화(Chung, Chin-Wha),박현철(Park, Hyun-Chul),이승민(Lee, Seunug-Min),권대용(Kwon, Dae-Yong) 한국신재생에너지학회 2010 신재생에너지 Vol.6 No.3
Foundation plays an important role in the offshore wind turbine system. Different from conventional foundations, the suction caisson is proven to be economical and reliable. In this work, three-dimensional finite element method is used to check the suitability of suction caisson foundation. NREL 5MW wind turbine is chosen as a baseline model in our simulation. The maximum overturning moment and vertical load at the mudline are calculated using FAST and Bladed. Meanwhile the soil-structure interaction response from our simulation is also compared with the experiment data from Oxford university. The design parameter such as caisson length, diameter of skirt and spacing of multipod are investigated. Accordingly based on these parameters suggestions are given to use suction caisson foundations more efficiently.
ZnGa<sub>2</sub>O<sub>4</sub> 형광체 타겟의 제작 및 특성분석
김용천,홍범주,권상직,김경환,박용서,최형욱,Kim, Yong-Chun,Hong, Beom-Joo,Kwon, Sang-Jik,Kim, Kyung-Hwan,Park, Yong-Seo,Choi, Hyung-Wook 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.12
The ZnGa$_2$O$_4$ phosphor target was synthesized through solid-state reactions as calcine and sintering temperature in order to deposit ZnGa$_2$O$_4$ Phosphor thin film by rf magnetron sputtering system. The x-ray diffraction patterns of ZnGa$_2$O$_4$ phosphor target showed the position of (311) main peak. The cathodoluminescence(CL) spectrums of ZnGa$_2$O$_4$ phosphor target showed main peak of 370 nm to 400 nm, and maximum intensity at the calcine temperature of $700^{\circ}C$ and sintering temperature of 130$0^{\circ}C$. It was possible to prepare The ZnGa$_2$O$_4$ phosphor thin film with synthesized ZnGa$_2$O$_4$ phosphor target and The prepared ZnGa$_2$O$_4$ phosphor thin film showed the position of (311) main peak.
김용천,황성수,Kim, Yong-Chun,Hwang, Seong-Soo 대한물리치료과학회 1995 대한물리치료과학회지 Vol.2 No.2
This article reviews the concepts of motor ability and motor skill and the models, theories, and treatment approaches of motor contorl. Reflex, hierarchical, and systems models of motor control are discussed. And muscle reeducation, neurodevelopment, motor relearning program, and contemporary task-oriented approach is also discussed. We consider that the concept of motor control is being changed and the treatment approach also is being changed. There are a number of reasons, the first is traditional trteatment approach has limitation. Second is theories of motor control is contineously developed. Third is new approach is coming to us. therefore, the therapists shoulder strive for acquisition of motor skill and motor ability. This article hope the successful integration of models and treatment approaches and its application in physical therapy practice.
기판온도 및 Annealing에 따른 ZnGa<sub>2</sub>O<sub>4</sub> 형광체 박막의 특성
김용천,홍범주,권상직,이달호,김경환,박용서,최형욱,Kim, Yong-Chun,Hong, Beom-Joo,Kwon, Sang-Jik,Lee, Dal-Ho,Kim, Kyung-Hwan,Park, Yong-Seo,Choi, Hyung-Wook 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.2
A ZnGa$_2$O$_4$ phosphor target was synthesized through solid-state reactions at a calcine temperature of 700 $^{\circ}C$ and sintering temperature of 1300 $^{\circ}C$ in order to deposit ZnGa$_2$O$_4$ phosphor thin film at various temperature using rf magnetron sputtering system. A ZnGa$_2$O$_4$ phosphor thin film was deposited on Si(100) substrate and annealed by a rapid thermal processor(RTP) at 700 $^{\circ}C$, for 15 sec. The x-ray diffraction patterns of ZnGa$_2$O$_4$ phosphor target and thin film showed the main peak (311) direction. ZnGa$_2$O$_4$ thin film has better crystalization due to as function of increasing substrate and annealing temperature. The cathodoluminescence(CL) spectrums of ZnGa$_2$O$_4$ phosphor thin film showed the main peak 420 nm wavelength and the maximum intensity at the substrate temperature of 500 $^{\circ}C$ and annealing temperature of 700 $^{\circ}C$, for 15 sec.
김용천,오경환,황성수,오경아,권혜정,Kim, Yong-Chun,Oh, Kyung-Hwan,Hwang, Seong-Soo,Oh, Kyung-A,Kown, Hei-Jeoung 대한물리치료과학회 1994 대한물리치료과학회지 Vol.1 No.2
This article considers the trend of Korea physical therapy reaearch. Because physical therapy research is important for the continued growth of the physical therapy profesion. Such research results in improved patient care and heightens the professional standing of the physical therapy field. The purpose of this article is to discuss a current research trend and to suggest a direction for developing a physical therapy research. We discussed a research design, purposes, and methods. Measurement are fundamental to the practice of physical therapy. The physical therapy evaluation is the foundation for the measurement of the outcome of our therapertic intervention. And we must measure thess outcomes. Achieving a high quality of physical therapy practice requires us to evaluate the client, selecting and adminstering a variety of tests and measurent. For the future study, physical therapist has a good treatment model and research program for evaluating and assessment.
권대용(Kwon, Dae-Yong),박현철(Park, Hyun-Chul),정진화(Chung, Chin-Wha),김용천(Kim, Yong-Chun),이승민(Lee, Seung-Min) 한국신재생에너지학회 2010 신재생에너지 Vol.6 No.3
With growing of wind turbine industry, offshore wind energy is getting more attention in recent years. Among all the components of offshore wind turbines, the foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, the 5 MW NREL reference wind turbine with rated speed of 11.4 m/s is used for load calculation. Wind and wave loads are calculated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is to simulate systemic and optimized load cases for the foundation analysis of wind turbine system.
이승민(Lee, Seunug-Min),권대용(Kwon, Dae-Yong),김용천(Kim, Yong-Chun),박현철(Park, Hyun-Chul),정진화(Chung, Chin-Wha) 한국신재생에너지학회 2010 신재생에너지 Vol.6 No.4
With the development of wind industry, rated power of the wind turbine also increases gradually. Accordingly, size of the wind turbine tower is becoming larger. Tower base diameter of the 2MW wind turbine is about 4m. Larger tower is expected for 4MW or 5MW turbines. Due to limitation of transportation, new type of tower with smooth transportation and effective cost is needed. In this work, a hybrid tower consisting of steel and concrete is designed and analyzed. The optimum ratio of steel and concrete of the hybrid tower is calculated as well as the thickness of the concrete part. Different FE analysis including modal analysis, buckling analysis and static analysis are performed to check the design of hybrid tower comparing with the steel tower. Redesign is also expected after various analyses.