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최혁재(Hyuk Jae Choi),강성재(Sung Jae Kang),권칠용(Chil Yong Kwon),류제청(Jei Cheong Ryu),이석민(Suk Min Lee),문무성(Mu Seong Mun) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.9
In this study, the control method of assistive robot was developed for the elderly. The control method of gait-assistant-robot was proposed considering the change of COP (Center of Pelves), BOS (Base of Support) and comparative analysis of the moving velocity for the elderly. We analyzed the movement of COP of the body and its velocity of the elderly equipped with manual walker and gait-assistant-robot. As a result, change in COP was greater from left to right than from anterior to posterior; also, the average velocity of the movement of COP and manual walker for manual walker gait was 0.7(m/s). Therefore, it is necessary to concern more on the left-right balance and synchronization of the velocity of COP.
Chin, Byung-Doo,Suh, Min-Chul,Kim, Mu-Hyun,Kang, Tae-Min,Yang, Nam-Choul,Song, Myung-Won,Lee, Seong-Taek,Kwon, Jang-Hyuk,Chung, Ho-Kyoon,Wolk, Martin B.,Bellmann, Erika,Baetzold, John P. The Korean Infomation Display Society 2003 Journal of information display Vol.4 No.3
Laser-Induced Thermal Imaging (LITI) is a laser addressed patterning process and has unique advantages such as high-resolution patterning with over all position accuracy of the imaged stripes of within 2.5 micrometer and scalability to large-size mother glass. This accuracy is accomplished by real-time error correction and a high-resolution stage control system that includes laser interferometers. Here the new concept of hybrid system that complement the merits of small molecule and polymer to be used as an OLED; our system can realize easy processing of light emitting polymers and high luminance efficiency of small molecules. LITI process enables the stripes to be patlerned with excellent thickness uniformity and multi-stacking of various functional layers without having to use any type of fine metal shadow mask. In this study, we report a full-color hybrid OLED using the multi-layered structure consisting of small molecules and polymers.
Harmonic Analysis Model based on PSCAD/EMTDC
Lee, Han-Min,Lee, Chang-Mu,Jang, Gil-Soo,Kwon, Sae-Hyuk The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Power Engineeri Vol.a4 No.3
This paper presents the model for an AC electric railway system using the PSCAD/EMTDC program. It is composed of a scott-transformer, an auto-transformer, catenary and electric trains, etc. After obtaining the models of the fundamental elements describing the AC electric railway system and its behavior, we have analyzed and tested an actual AC electric railway system focused on the amplification of harmonic current to verify the proposed model. The simulation results from the proposed approach and the measurement data from the test are described.
구상흑연주철의 피절삭성과 내마모성에 미치는 Boron 첨가의 효과에 관한 연구
최양진,이병엽,권혁무,백상한,박용진 ( Yang Jin Choi,Byung Yehp Lee,Hyuk Mu Kwon,Sang Han Baek,Yong Jin Park ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.1
N/A It is very important to obtain high performance ductile iron by addition a small amount of alloying elements. In this study, to improve the characteristics of small piston ring tasted from ductile iron melt a small amount of boron(0∼0.008wt.%) that is powerful carbide stabilizer was added in ductile iron, and inspected it`s effects on the microstructure, wear resistance, machinability and mechanical properties. The results obtained from this study are as follows. 1. As the amount of boron increased to 0.04wt.%, the machinability of ductile iron is increased, and if the amount is in excess of 0.04wt.% the machinability is decreased conversely. 2. The wear resistance of ductile iron is improved by boron addition. 3. The recommended ladle addition of boron amount ranges from 0.04wt.% to 0:06wt.% for the use of small piston ring.
Al-xSi-2Cu-1Mg/ySiC(x:6 , 12 , 18. y:0∼10wt.%) 계 복합재료의 열적성질에 관한 연구
박상준,조원용,강세선,임윤수,권혁무,윤의박 ( Sang Joon Park,Won Yong Jo,Se Seon Kang,Yoon Su Lim,Hyuk Mu Kwon,Eui Park Yoon ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.4
N/A The purpose of this study is to obtain basic information on the particle dispersion, the coefficient of thermal expansion and the thermal conductivity of compocasted Al-xSi-2Cu-1Mg/ySiC(x:6, 12, 18. y: 0∼10wt.%) composite. With increasing the content of SiC particles, the thermal expension coefficient and the thermal conductivity decrease. The coefficient of thermal expension between 20 and 300℃ is 21.3×10^(-6)/℃∼ 18.0×10^(-6)/℃ for the Al-Si alloys and 18.4×10^(-6)/℃∼16.0×10^(-6)/℃ for the composite with 10wt. % SiC. The thermal conductivity at 300℃ is 121∼169W·m^(-1)·k^(-1) for the Al-Si alloys and 114∼159W·m^(-1)·k^(-1) for the composite with 10wt. % SiC.
다양한 샘플링 조건에 따른 선박 배기가스 내 입자상물질의 구조 특성에 관한 실험 연구
이원주,장세현,김성윤,강무경,천강우,조권회,윤석훈,최재혁,Lee, Won-Ju,Jang, Se-Hyun,Kim, Sung-Yoon,Kang, Mu-Kyoung,Chun, Kang-Woo,Cho, Kwon-Hae,Yoon, Seok-Hun,Choi, Jae-Hyuk 해양환경안전학회 2016 해양환경안전학회지 Vol.22 No.5
선박용 디젤엔진 배기가스에 포함된 입자상물질(PM) 가운데서 블랙카본(BC)은 극지방의 해빙을 촉진시키고 온난화를 유발하는 원인물질로서 큰 주목을 받고 있다. 본 연구에서는 향후 예상되는 PM/BC 배출 규제에 선제적으로 대응하고, 저감기술 개발 및 실증을 위한 기초연구의 일환으로 한국해양대학교 실습선 한바다호를 이용하여 실제 운항 중에 주기관의 배기관 수 포인트에서 PM을 샘플링하여 HR-TEM을 통해 그 구조와 특성을 분석하였다. 또한 배기가스 분석기를 이용하여 운전조건별 배기가스 내 유해물질의 배출 경향을 확인하였다. 분석 결과 엔진에서 배출된 PM의 구조는 구형 입자들의 촘촘하지 않은 체인형 결합으로 이루어져 있으며, 과급기로부터 멀어질수록 온도 저하에 의한 응집이 더 많이 관찰되었고 BC 특유의 graphitic 구조를 잃어가면서 점점 amorphous 구조를 띠는 경향이 나타났다. 또한 배기가스 분석을 통해 엔진 회전수가 증가할수록 배기 내 PM의 농도는 감소할 것으로 예측되었다. Black carbon (BC) contained in particulate matter (PM) originating from the exhaust gases of ships' diesel engines has been receiving great attention as a cause of glacial melting and warming in the polar regions. In this study, we took samples from various locations of PM emitted from the training ship (T/S) HANBADA's main engine, in cooperation with the Korea Maritime and Ocean University. We analyzed the structure and characteristics of these samples using high-resolution transmission electron microscopy (HR-TEM) and applied our findings as fundamental research for developing PM reduction technology. We also employed our results to determine appropriate preemptive action to meet upcoming PM/BC regulations. In addition, we confirmed the emission trend of pollutants from exhaust gases under various engine operating conditions using an exhaust gas analyzer. Results obtained from the analysis of HR-TEM images showed that the structure of the PM is chain-like wispy agglomerates consisting of a number of individual spherical particles. As the sampling location was moved away from the turbo charger (T/C) towards the funnel, more condensates were observed at a low temperature and the molecular structure of the PM lost its characteristic BC structure as an amorphous structure gradually appeared. Furthermore, through the analysis of exhaust gases, we predicted a decrease in PM concentration in the exhaust stream as engine rpm increase.
직류 도시철도 시스템 에너지 효율 향상 및 안정화를 위한 슈퍼커패시터 에너지 저장장치 활용 방안 연구
송지영,이계병,이한상,장길수,권세혁,이장무,이한민,김길동,Song, Ji-Young,Lee, Kye-Byung,Lee, Han-Sang,Jang, Gil-Soo,Kwon, Sae-Hyuk,Lee, Chang-Mu,Lee, Han-Min,Kim, Gil-Dong 한국전기전자학회 2009 전기전자학회논문지 Vol.13 No.1
In this paper, a simulation for the stability of the catenary voltage through charging and discharging by introducing an energy storage system in the railway system and the efficient usage of restoration energy has been performed. In order for the simulation, a simple railway model with an appropriate control technique has been introduced. The catenary voltage area is divided into two areas with voltage control and an area with normal operation and current control is performed to satisfy current limit of the supercapacitor. We confirmed the energy absorption and emission through the simulation and observed energy efficiency through charging and discharging according to the operation state of the railway. 본 논문에서는 철도 시스템에 에너지 저장장치를 도입하여 충 방전을 통한 가선전압의 안정화와 회생에너지의 효율적인 사용을 모의하였다. 이를 위해 간단한 철도 모델과 적절한 제어기법을 제시하였다. 가선전압의 영역을 제어가 필요한 두 영역과 정상운전 영역으로 구분하여 전압제어를 하고, 슈퍼커패시터의 전류제한을 충족시키기 위하여 전류제어를 병행하였다. 이를 바탕으로 에너지의 저장, 방출을 시뮬레이션을 통하여 확인하였고, 철도의 운전 상태에 따라 에너지 충 방전을 통한 에너지 효율을 살펴보았다.