http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
범희락(Hee Rak Beom),조형석(Hyung Suck Cho) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper proposes a sensor-based path planning method which utilizes fuzzy logic and neural network for obstacle avoidance of a mobile robot in uncertain environments. In order to acquire the information about the environment around the mobile robot, the ultrasonic sensors mounted on the front of mobile robot are used. The neural network, whose inputs are preprocessed by ultrasonic sensor readings, informs the mobile robot of the situation of environment in which mobile robot is at the present instant. Then, according to the situation class, the fuzzy rules are fired to make a decision on the mobile robot action. In addition, this method can be implemented real time since the number of fuzzy rules used to avoid the obstacle is small. Fuzzy rules are constructed based on the human reasoning and tuned by iterative simulations. The effective of the proposed avoidance method is verified by series of simulations.
임경화,안채헌,양손,한완희,범희락,Rim, Kyung-Hwa,An, Chae-Hun,Yang, Xun,Han, Wan-Hee,Beom, Hee-Rak 한국반도체디스플레이기술학회 2009 반도체디스플레이기술학회지 Vol.8 No.4
A SMT mounter is a kind of equipment that mounts SMD parts quickly on the printed circuit board. By using linear motors, it is controlled with high speed and precision, which is similar to semi-conductor and display process equipment. It is necessarily used in an assembly process of an electronic device. Mobile devices such as a mobile phone and PDA are required to reduce mount areas due to the demands for high performance and small size. Hence, super small sized and complex mobile devices have been developed. To improve the productivity of the corresponding equipment, designs with large sized, high speed, and multidisciplinary functions have been consistently performed. Meanwhile, a design trend of large size and light-weight on SMT mounter causes a low natural frequency of systems and vibration problems at the high speed operation. In this paper, the dynamic characteristics of the SMD mounter system were investigated through a modal test and transmissibility test, and verified by finite element method. Also, various design improvement was performed to avoid the resonance phenomena.
임재곤(Jae-Gon Lim),김만달(Man-Dal Kim),범희락(Hee-Rak Beom),홍성욱(Seong-Wook Hong) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
This paper presents a result of dynamic modeling and simulation for deploying beams. When a beam is axially deploying, lateral vibration is often observed. This paper proposes a finite element modeling technique to cope with time-varying properties of this kind of deploying beams. The simulated result from the proposed model is compared with that from a reference. Two-stage deploying beams are also investigated with the proposed dynamic modeling method.
축방향으로 전개되는 보의 중력에 의한 횡진동 저감 연구
임재곤(Jae-Gon Lim),윤원상(Won-Sang Yoon),범희락(Hee Rak Beom),홍성욱(Seong-Wook Hong) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.8
This paper presents the dynamic modeling and vibration suppression methods for axially deploying beams subjected to gravity. A modal modeling method is employed to develop the lateral vibration model for axially deploying beams. Simulation is made to validate the proposed model as well as to investigate the dynamics of axially deploying beams. This paper rigorously investigates the gravity effect as a source of vibration for axially deploying beams. In order to suppress lateral vibration for deploying beams, the moving speed command is modified by using the input shaping method. Experiments are also performed to prove the proposed vibration suppression method. The simulations and experiments show that the proposed modeling and input shaping methods are effective for the dynamic analysis and vibration suppression of axially deploying beams subjected to gravity.