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항공장비용 환경제어시스템의 제어변수별 운전특성에 관한 실험적 연구
박형필(Hyungpil Park),강훈(Hoon Kang),김용찬(Yongchan Kim),지용남(Yongnam Chi),최희주(Heeju Choi),변영만(Youngman Byeon),김영진(Youngjin Kim),오광윤(Kwangyoon Oh) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Environmental control system is installed to dissipate the thermal load in avionic equipments which is mounted under aircraft. The operating characteristics of the system changes with the variations of control parameters. In this study, the environmental control system was designed and built by adopting vapor compressor cycle using R-124. The operating characteristics of this system was experimented varying control parameters, such as refrigerant charging amount, expansion device opening, compressor rotating speed, blower rotating speed. The effect of the control parameters on the environmental control system was analyzed and the optimum control method was suggested.
항공장비용 환경제어시스템의 운전특성에 관한 실험적 연구
박형필(Hyungpil Park),강훈(Hoon Kang),지용남(Yongnam Chi),최희주(Heeju Choi),변영만(Youngman Byeon),김영진(Youngjin Kim),오광윤(Kwangyoon Oh),김용찬(Yongchan Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.9
환경제어시스템은 항공전자장비로부터의 열부하를 제거하기 위한 목적으로 설치되어지며, 본 환경제어시스템은 제어변수의 변화에 따라 다양한 운전특성을 나타낸다. 본 연구에서는 냉매 R-124를 작동유체로 하는 증기압축 사이클 방식을 적용한 환경제어시스템을 설계 및 제작하였다. 냉매충전량, 팽창밸브개도, 압축기 및 송풍기 운전회전수와 같은 제어변수의 변화에 따른 환경제어시스템의 성능 및 운전 특성 변화를 실험하였다. 각 제어변수가 시스템에 미치는 영향을 분석하였으며, 최적제어를 위한 방안을 제안하였다. An environmental control system is installed to dissipate the thermal load in avionic equipments that are mounted under an aircraft. The operating characteristics of the system change with variations in the control parameters. In this study, an environmental control system was designed and built using R-124 by adopting a vapor compression cycle. The operating characteristics of this system were observed by varying the control parameters, such as refrigerant charging amount, opening of the expansion device, compressor rotation speed, and blower rotation speed. The effect of the control parameters on the environmental control system was analyzed and an optimum control method was identified.
PC-HT 소재의 사출압력에 압력의존계수가 미치는 영향
박형필(Hyungpil Park),최명진(Myoung Jin Choi) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Injection molding analysis uses the Cross-WLF viscosity model to predict injection pressure. However, the high heat-resistant PC-HT (Covestro: APEC 2097) material does not have the pressure dependence constant D3, which is one of the viscosity model coefficients. Therefore, there is a problem that the injection pressure is predicted to be lower than the actual result. In this study, we try to estimate the appropriate pressure dependence constant D3 of the Cross-WLF viscosity model in order to increase the accuracy of predicting the injection pressure of PC-HT material. We estimated the value of the pressuredependent constant by applying the concept of a free volume model to examine the cause of the decrease in fluidity and increase in injection pressure of PC-HT. In the injection molding analysis, it was confirmed that the difference between the actual and predicted injection pressure was very large when the D3 of the Cross-WLF viscosity model was not applied. The injection pressure applying the estimated pressure dependence constant was able to obtain the predicted result within about 10% of the actual result.
Challenges and implemented technologies used in autonomous drone racing
Moon, Hyungpil,Martinez-Carranza, Jose,Cieslewski, Titus,Faessler, Matthias,Falanga, Davide,Simovic, Alessandro,Scaramuzza, Davide,Li, Shuo,Ozo, Michael,De Wagter, Christophe,de Croon, Guido,Hwang, Su Springer-Verlag 2019 INTELLIGENT SERVICE ROBOTICS Vol.12 No.2
Vision-based Modular Docking System for Cooperative Mobile Robots
김용태,Hyungpil Moon,Jae Hoon Park,최혁렬,노흥식,Jin-Woo Jung 동국대학교 정보융합기술원 2009 International Journal of Assistive Robotics and Sy Vol.10 No.1
Even though small robots with simple driving mechanisms have advantages in manufacturing cost and ability to navigate through narrow environments, not many small-size mobile robots are used for navigating outdoor environments due to their limited mobility. In this paper, we design a modular docking device for physical connection between such small mobile robots to enhance their mobility. Such a docking mechanism is required to tolerate relative position and orientation errors between the robots while docking each other. The docking module is designed to employ a peg and cup where the base of the peg is mounted to a ball-socket joint and the motion of the peg is restrained by spring forces. We also provide a vision-based docking scheme between the modular robots under the unknown environments. Successfully connected mobile robots can cooperatively maneuver rough environment with improved mobility. We experimentally demonstrate the effectiveness of the proposed vision-based modular docking method with two small-size mobile robots.
Right Calf Claudication Revealing Leriche Syndrome Presenting as Right Sciatic Neuropathy
Do Hyun Yoon,Hyungpil Cho,Seung Jun Seol,Taikon Kim 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.1
The syndrome of aortoiliac occlusive disease, also known as Leriche syndrome, is characterized by claudication, pain, and diminished femoral pulse. We highlight an unusual case of right sciatic neuropathy caused by Leriche syndrome, which was initially misdiagnosed. A 52-year-old male, with a past medical history of hypertension and bony fusion of the thoracolumbar spine, visited our hospital complaining of right leg pain and claudication, and was initially diagnosed with spinal stenosis. The following electrophysiologic findings showed right sciatic neuropathy; but his symptom was not relieved, despite medications for neuropathy. A computed tomography angiography of the lower extremities revealed the occlusion of the infrarenal abdominal aorta, and bilateral common iliac and right external iliac arteries. All these findings suggested omitted sciatic neuropathy associated with Leriche syndrome, and the patient underwent a bilateral axillo-femoral and femoro-femoral bypass graft.
Youngjin Choi,Joono Cheong,Hyungpil Moon IEEE 2010 IEEE/ASME transactions on mechatronics Vol.15 No.5
<P>This paper describes a new trajectory planning method for the output tracking control of linear flexible systems; this method computes the exact solution of the equilibrium manifold. We establish a system of differential equations by combining kinematic and dynamic constraints and reformulate them in a singularly perturbed dynamics to obtain the equilibrium manifold in the form of an infinite series, which is our planned trajectory. We show that for the desired output defined by exponential functions, the equilibrium manifold becomes a converging geometric series that has a succinct form of summation. In addition, the inverse torque, which is the feedforward command, is easily produced by using the computed exact equilibrium manifold. We validate the effectiveness of the proposed method through simulations and experimental studies using a single-link flexible arm.</P>