http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
인공 신경회로망을 이용한 전자비례 감압밸브의 솔레노이드 형상 최적화
윤주호,웬민냣,이현수,윤장원,김당주,이동원,안경관,Yoon, Ju Ho,Nguyen, Minh Nhat,Lee, Hyun Su,Youn, Jang Won,Kim, Dang Ju,Lee, Dong Won,Ahn, Kyoung Kwan 유공압건설기계학회 2016 드라이브·컨트롤 Vol.8 No.3
Unlike the commonly used On/Off solenoid, constant attraction force which is independent of plunger displacement is a considerably important characteristic to proportional solenoid of the EPPR Valve. Attraction force uniformity is mainly affected by the internal shape design parameters. Due to a number of shape design parameters, the optimal parameter values are very complex and time consuming to find by trial and error method. Much research has been conducted or are still in progress to find the optimal parameter values by applying various optimization techniques like Genetic Algorithm, Evolution Strategy, Simulated Annealing, or the Taguchi method. In this paper, the design parameters which have primary effects on the attraction force uniformity and the average attraction force are decided by main effects analysis of Design of Experiments. Optimal parameter values are derived using finite-element analysis and a neural network model.
PVDF 압전막을 이용한 초고주파 집속 초음파 트랜스듀서의 제작 및 특성 평가
윤주호,오정환,김정순,김무준,하강렬,Yoon, Ju-Ho,Oh, Jung-Hwan,Kim, Jung-Soon,Kim, Moo-Joon,Ha, Kang-Lyeol 한국음향학회 2011 韓國音響學會誌 Vol.30 No.4
In order to obtain high resolution images, a focusing ultrasonic transducer operated in very high frequency (VHF) range was fabricated and its characteristics were evaluated. A 9-${\mu}m$ thick PVDF film with only one metalized surface for electric ground was adhered to a CCP (Copper-clad polyimide) film by using epoxy. It was pressed by a metal ball to form a concave surface and its rear side was filled with the epoxy. The radius of curvature and the f-number of the fabricated transducer are 7.5 mm and 1.7, respectively. The pulse-echo measurement results from a target located at the focal point showed that the frequency bandwidth was 35.0 MHz and the insertion loss near the peak frequency of approximately 40 MHz was about 60 dB. Those values agreed well with the simulation results by the KLM equivalent circuit analysis including the effect of the epoxy bonding layer. When the image of thin copper lines by the 35 MHz transducer of the UBM (Ultrasonic Backscattering Microscope) system was compared with the image by the transducer fabricated in this study, the fabricated transducer was observed that the axial resolution was improved although the lateral resolution was degraded. 높은 분해능의 영상을 얻는데 사용하기 위하여 초고주파 대역에서 동작하는 집속 초음파 트랜스듀서를 제작하고 그 특성을 평가하였다. 그 트랜스듀서는 한쪽 면에만 접지용 전극이 있는 두께 9 ${\mu}m$의 PVDF 압전막의 다른 쪽 면에 CCP (Copper Clad Polyimide)막을 에폭시로 접착한 후, 금속구로 압착함에 의해 구각형을 형성시키고, 그 뒷면에 에폭시를 채워 몰딩 시키는 방법에 의해 만들어졌다. 제작된 곡률반경 7.5 mm, f-number 1.7의 트랜스듀서는 초점에 있는 표적에 대한 펄스에 코 측정결과 35.0 MHz의 대역폭을 가지며, 약 40 MHz인 피크주파수 부근에서의 삽입손실은 약 60 dB 을 나타내었는데, 그 측정결과는 에폭시 접착층의 두께를 고려한 KLM 등가회로 해석에 의한 시뮬레이션 결과와 유사한 것이었다. 나아가, 그 트랜스듀서에 의해 얻어진 가는 구리선 표적에 대한 영상을 35 MHz 트랜스듀서를 장착한 UBM (Ultrasonic Backscattering Microscope) 장치에 의한 영상과 비교한 결과, 측방향 분해능은 떨어지나 축방향 분해능은 다소 향상됨을 알 수 있었다.
인공 신경회로망을 이용한 전자비례 감압밸브의 솔레노이드 형상 최적화
윤주호(Ju Ho Yoon),웬민냣(Nguyen Minh Nhat),이현수(Hyun Su Lee),윤장원(Jang Won Youn),김당주(Dang Ju Kim),이동원(Dong Won Lee),안경관(Kyoung Kwan Ahn) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.2
Unlike the commonly used On/Off solenoid, constant attraction force which is independent of plunger displacement is a considerably important characteristic to proportional solenoid of the EPPR Valve. Attraction force uniformity is mainly affected by the internal shape design parameters. Due to a number of shape design parameters, the optimal parameter values are very complex and time consuming to find by trial and error method. Much research has been conducted or are still in progress to find the optimal parameter values by applying various optimization techniques like Genetic Algorithm, Evolution Strategy, Simulated Annealing, or the Taguchi method. In this paper, the design parameters which have primary effects on the attraction force uniformity and the average attraction force are decided by main effects analysis of Design of Experiments. Optimal parameter values are derived using finite-element analysis and a neural network model.
윤주호 ( Yoon Ju Ho ) 디자인융복합학회 2017 디자인융복합연구 Vol.16 No.1
이 연구는 3년제 과정의 건축BIM 스튜디오에서 학생들의 능력향상과 창의성 증진을 위한 교수법과 교육 효과를 증진시키기 위한 방안을 모색하고자 하였다. 학생들의 수학능력에 대한 수준은 매년 점차 낮아지는 상황에서 건축 직무능력의 향상을 위한 교육과 질적인 향상이라는 관점에서 구체적이고 효과적인 건축BIM의 창의적 교수법에 대한 연구의 필요성이 있다. 건축BIM의 창의교수법에 대한 이론적 고찰과 선행연구를 분석하고 BIM교과와 연계된 건축스튜디오에서 한 학기의 관찰과 지도를 실시하여 학생들에게 나타난 교육내용의 이해 및 창의기법의 적용검토와 교수법유형을 다루고 학생의 수준과 교육내용에 대한 회귀분석과 분산분석을 통하여 건축BIM 교육의 개선점을 모색하였다. 건축BIM교과에 대한 학생들의 직무능력 향상과 창의성 증진을 위해 필요한 교수법적 전략과 대안을 제시하고자 한다. The purpose of this study is to explore teaching methods for improving students` learning competence and creativity in the 3-year course of BIM studio. With students` learning competence getting lowered, there is all the more necessary to find creative teaching methods for improve their architectural job competence. This study first reviews some theories and precedent research on creative teaching methods of architectural BIM and, based on the one-year teaching in the architectural studio related to the BIM curriculum, analyses students` learning comprehension and creativity according to each teaching method type, and last suggests some teaching strategies and alternatives to improve students` academic competence and creativity in the BIM subjects.
CFD를 이용한 EPPR 밸브 유동력 특성 분석 및 시뮬레이션
윤주호(Ju Ho Yoon),윤장원(Jang Won Youn),손호연(Ho Yeon Son),김당주(Dang Ju Kim),안경관(Kyoung Kwan Ahn) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.1
Flow force is the additional unbalanced force acting on the valve spool by fluid flow, excluding the static pressure force that is offset on the spool land wall at the same magnitude. When designing the valve spool, it is assumed that the same average value of static pressure is applied to the inlet and outlet spool land wall in one chamber. However, the high velocity of the fluid flow by the inlet or outlet metering orifice creates unbalanced pressure distribution and generates additional force in the opposite direction to that of the solenoid attraction force. This flow force has a negative effect on the control performance of the EPPR valve, which needs to develop uniform output pressure along the entire spool control range. In this study, we developed a 3D model of the EPPR valve and conducted flow force characteristic analysis using CFD S/W (ANSYS FLUENT). The alleviated flow force model was derived by adjusting the design parameters of the spool notch.
내열성 향상을 위한 폴리케톤/탄성체 블렌드 제조 및 특성
윤주호 ( Ju Ho Yun ),윤정환 ( Jeong Hwan Yoon ),하성문 ( Seong Mun Ha ),김종활 ( Jong Hwal Kim ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.1
폴리케톤은 일산화탄소, 에틸렌, 프로필렌을 단량체로 중합되는 삼중공중합체 (terpolymer)로서 폴리아미드, 플리에스테르, 폴리카보네이트 등의 일반 엔지니어링 플라스틱 소재에 비해 원료 및 중합 공정비가 저렴한 소재이다. 또한 기계적 특성과 내열성, 내화학성, 연료투과성, 내마모성 등이 우수하여 기존 엔지니어링 플라스틱 소재를 대체할 수 있는 환경 친화적인 소재로 주목을 받고 있다. 본 연구에서는 폴리케톤의 내열성을 향상시키기 위해 탄성체(Ethylene propylene copolymer, Nitrile butadiene rubber, Ethylene acrylic rubber)를 배합하여 블렌드물을 제조하였고, 각 소재에 대하여 내열성, 내유성에 평가에 따른 특성을 분석하였다. Terpolymer polymerized carbon monoxide, ethylene and propylene as monomer, Polyketone is low-cost material compared with general engineering plastics such as polyamide, polyester, polycarbonate. Moreover, it is excellent in mechanical properties, chemical resistance, fuel permeability and abrasion resistance. So, it is attracted attention as the environmental friendly material to replace conventional engineering plastics. In this study, has been prepared Polyketone/Rubber (Ethylene propylene copolymer, Acrylonitrile butadiene rubber, Ethylene acrylic rubber) blends to improve heat resistance and investigated characteristic behavior after heat/oil aging.