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임승철 한국원자력산업회의 1996 원자력산업 Vol.16 No.10
우리 나라의 원자력 연구 개발 중장기 계획은 92년부터 2001년까지 10년간을 사업 기간으로 정하고 있으며, 현재 5차 연도 연구 사업이 진행중이다. 그 동안 국내의 원자력 연구 개발을 활성화시키면서 많은 성과를 거둔 이 계획은, 96년도에 들어서면서 여러 요인에 의해 원자력 연구 개발 추진 환경에 커다란 변화를 가져옴에 따라, 현행 계획에 대한 평가 및 보완이 불가피한 것으로 보인다. 그간의 추진 경과 및 주요 결과를 돌아보고, 앞으로의 원자력 연구 개발 추진 전망을 살펴본다.
임승철 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
This paper concerns an articulated space robot with flexible links. Its equations of motion are derived to be nonlinear. Assuming that magnitude of elastic motions are relatively small the perturbation approach is taken to seperate the original equations of motion into linear equations describing perturbed motions and nonlinear equations purely rigid motion of the robot. To effect the planned payload motion open loop control inputs are first determined based on the inverse dynamics of the latter. In order to reduce the positional error during that maneuver, an active vibration suppression scheme is desired. To this end, a feedforward control is applied for disturbance cancellation as much as possible. For performance robustness against residual disturbance, an optimal feedback control is additionally designed based on the linear perturbation equations and the LQR theory modified with a prescribed degree of stability. Numerical simulation show the effectiveness of such a control scheme.
林勝哲 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
This paper presents vibration analyses of hard disk drive (HDD) spindle systems based on the finite element method. The systems under investigation have a cantilevered shaft rotating on hydrodynamic bearings. In particular, the influence of stator's flexibility on major modes has been taken into account by employing relatively macroscopic elements instead of extremely fine ones popular in commercial codes. In order to prove the effectiveness of such a formulated model, two types of HDD prototypes featuring different hub and stator structures are selected as examples. Compared to the first, the second type has a reinforced stator that would raise the natural frequency of the hub’s translational (or sideway) mode. Both free and forced vibration characteristics are computed, and subsequently compared with experimental data. Conclusively, the proposed distributed model method is an efficient design tool for state-of-the-art HDD spindle systems
임승철,최각진 대한전자공학회 1993 전자공학회지 Vol.20 No.1
본 고에서는 개인통신에 대한 각국의 기술전망을 분석하고 다양한 통신서비스를 지원할 수 있는 개인통신의 지능화 국내의 개인통신의 진화방안에 대해서 기술하고자 한다.
임승철,어윤범,Lim, Seung-Cheol,Eao, Yun-Beom 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
This paper concerns a 2-axis PR type pneumatic manipulator system translating in vertical and rotating in horizontal directions. A simplified linear model is mathematically formulated similar to the pneumatic acturators in dynamic responses in order to devise an appropriate position control scheme. A PD controller preceding the on/off solenoid valve turns out not only economical but also effective in reducing rise time and amplitude of limit cycles, if its control gains are determined on the basis of frequency response. And, additional implementation of symmetric or asymmetric deadband at the PD controller output greatly helps minimize valve opening numbers, positional error, and undesirable direction-dependent property due to the gravitational load. Such a control concept is synthesized through numerical simulations and next applied to the experimental set-up, featuring enhanced positional servo characteristics.
임승철,정해성,Im, Seung-Cheol,Jeong, Hae-Seong 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.1
Most quadruped walking robots under current research are individually controlling every joint ic make them step or walk according to an integrated strategy. Such methods are characterized by at least one pair of an actuator and a sensor installed per each 'oint so that the robots weigh execssively and move inefficiently in terms of energy expenditure. In addition, the task of controlling all the joints simultaneously is quite complex and prone to destabilize the robot motion. These respects keep the existing walking robots away from realistic applications such as transportation even if they have potentially, outstanding adaptability to swamps or uneven terrains as opposed to wheeled vehicles. So, this paper presents a new conceptual quadruped robot developed to walk and steer only with a minimal number of actuators owing to a closed-chain mechanism. To prove its actual performance including the adaptability to various types of terrains. experiments are done with the mammal-type prototype. And. it is also shown that the same concept can be easily extended to carry out different gait forms. for instance, that of spiders only with minor modifications.
임승철 한국소음진동공학회 1999 소음 진동 Vol.9 No.1
현, 판, 막의 진동을 이용하는 피아노, 실로폰, 드럼, 북 등의 악기류를 제외하고는 일반적으로 구조물의 진동은 억제 대상이며 최근에 와서는 이에 관련된 환경 소음 및 진동에 대한 규제가 더욱 강화되는 추세이다. 그러나 자원 및 에너지 소비의 절감을 통한 제품단가의 인하뿐만 아니라 폐기물의 감소등 환경오염의 예방차원에서도 제품의 경량화가 지속적으로 추진되고 있고, 또한 제품성능에 대한 소비자의 기대는 상대적으로 저렴한 가격에 동일하거나 더 높아짐으로써 진동제어 문제가 더욱 부각되고 있다.(중략)