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강덕수 ( Duck Soo Kang ),김지선 ( Jee Sun Kim ),홍준희 ( Jun Hee Hong ) 한국외국어대학교 언어연구소 2007 언어와 언어학 Vol.0 No.39
Duck-soo Kang.Jee-sun Kim.Jun-hee Hong. 2007. A Study of Obstruents in Yakut through Analysis of Borrowed Words from Russian. Language and Linguistics 39, 1-16. One of the most important constraints in Yakut is connected with syllabic structure. Its syllabic structure is based on CV. So the constraint of "NoGeminates" is strictly applied. And the harmony between features is also considered important. Yakut has the strict constraint on the phonotactical relations. In Yakut a feature [constricted glottis] works more vigorously than [voiced]. This feature is combined with a feature [+back] or [+lab], making new constraints on the initial place: *#[+back, -CG], *# [+lab,+CG]. Finally, consonantal assimilation in obstruents of Yakut is dominated by 2 lows of constraints. VowelHarmony >> Ident-CV[pl] >> NCP >> *[+palatal]# >> Ident-IO; *#[+back, -cont][+back,-high] >> *#[+back,-CG], *# [+lab,+CG] >> [+cont] >> NoGem >> Ident-IO >> *[+voiced]#
복수 협력 여유 관절 로보트 매니퓰레이터 시스템의 관절럭 최적화
강희준 울산대학교 1993 공학연구논문집 Vol.24 No.2
본 논문에서는, 복수의 여유 관절 매니퓨레이터들이 협력하여 하나의 공통 물체를 정해진 경로에 따라 움직이고자 할 때, 이 시스템 내부에 존재하는 여유도(redundancy)를 이용한 관절력 최적화 문제가 고려된다. 관절력 최적화 문제에서 흔히 발생하는 관절력의 불안정성을 해결하기 위하여 널 스페이스 댐핑 방법이 제안, 적용된다. 고려된 방법의 효율성은 3개의 복수 협력 로보트의 시뮬레이션을 통하여 입증된다. In this article, joint torque optimization is considered for multiple cooperating redundant manipulators rigidly handling a common object. This work focuses on finding the optimal distribution of the operational forces of a multiple redundant manipulator system to the individual mainipulators. Two joint torque optimization schemes(local joint torque minimization and natural joint motion) are formulated and compared. From the simulation results of a system of three cooperating redundant manipulators, the natural joint motion scheme is shown to be better than the local joint torque minimization scheme with regard to global torque minimization capability and the resulting stability of motion. However, in order to guarantee the stability, the null space damping method is required for the both schemes. The effectiveness of the null space damping method is demonstrated by simulation. Additionally, the condition for the distribution of the operational forces required to drive the given system along a natural joint motion trajectory is addressed.
전태원,정청희,이강헌 師範大學 體育硏究所 1994 서울大學校 體育硏究所論集 Vol.15 No.2
The purpose of this study was to investigate the effect of the MC² learning systems on cognitive ability. Twenty male university students were sellected as subjects and were randomly assigned to both a control (10) and an experimental group (10). Subjects were then pre-tested for simple, and choice reaction time, movement time, short-term memory, probeability and concentration. The practice were for 30 minutes each, 3 days a week for 4 weeks. The finding of this study were as the follows. ① MC² learning system did not increase simple & choice reaction time. ② MC² learning system partly improved of movement time. ③ MC² learning system partly increased short-term memory. ④ MC² learning system did not increased probeability. ⑤ MC² learning system increased the concentration ablility. These test were done with limited subjects over very short experimental period and only a few programs were selected from among the whole MC² learning system. Therefore, more research will be required in well controlled laboratory & field situations to determine the long term effect of MC² learning system.
자기베어링시스템 강성의 실험적 고찰을 통한 안정화 특성에 관한 연구
강성구,강종규,홍준희 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
Due to the lack of stiffness and difficulties of control, it is hard to achieve well balanced magnetic levitation. In this paper, we analysis the current and position stiffness change according to bias current through experiment. Then, compensation equations were presented. After obtaining PD gain for each bias current and PD gain region through levitation experiment, we consider the characteristics.
姜錫浩,宋希準,安熙官 嶺南大學校 工業技術硏究所 1978 연구보고 Vol.6 No.1
In order to study the flow characteristics of spherical glass-beads ranging from 40 mesh to-115 mesh, its angle of repose and angle of rupture were measured as a function of average particle size, addition of fine powder as glidant or lubricant, and admixture of 2 or 3 adjacent fractions of beads classified by screening. The angle of repose of the glass-beads increases with increasing particle size of above 100 mesh, but for beads smaller than 100 mesh, the angle of repose increases with decreasing particle size. Fine glidant of montmorcalite added to the beads in very small concentrations of 0.6wt, % decreases the flow angles, while it tends to increase strongly the flow angles at higher concentrations.
광파이버 변위 센서를 적용한 자기베어링 정적 부상 제어 연구
강종규,신우철,홍준희 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
Five expensive sensors are necessary to control a magnetic bearing system. The sensor price rate of magnetic bearing system is high. So it is necessary that cheap and good sensor is developed. The optical fiber displacement sensor is adaptive to satisfy this condition. We can design magnetically suspended spindle based on static characteristic of optical fiber displacement sensor developed. The controller can be designed by decoupled feedback PD. Therefore, it is simpler than any other controller comparatively.
광파이버 변위 센서를 이용한 자기베어링 계의 부상 제어
강종규,신우철,송관의,홍준희 충남대학교 공업교육연구소 2003 論文集 Vol.26 No.1
Five expensive sensors are necessary to control a magnetic bearing system. The sensor price rate of magnetic bearing system is high. So it is necessary that cheap and good sensor is developed. The optical fiber displacement sensor is adaptive to satisfy this condition. We can design magnetically suspended spindle based on static characteristic of optical fiber displacement sensor developed. The controller can be designed by decoupled feedback PD. Therefore, it is simpler than any other controller comparatively.
로보트 매니플레이터의 KIC-Based 동력학적 모델링의 개선 방안 연구
강희준 울산대학교 1993 공학연구논문집 Vol.24 No.2
본 논문은 기존의 KICs(Kinematic Influence Coefficients)에 근거한 로보트 매니퓰레이터의 동력학적 모델링 방법과 그 적용의 장점을 소개하고, 이 방법의 단점인 계산의 비효율성을 극복하기 위한 개선 방안을 제시한다. 제시된 방법은 Generalized Augmented Body 개념을 기초로 하고, 기존의 방법에 비교하여 동력학적 모델을 구하는데 필요한 계산의 갯수(Computational Counts)의 44% 감소를 이루었다. In this paper, the current KIC(Kinematic Influence Coefficients) based dynamic modeling algorithm of robot manipulators is modified to overcome its computational inefficiency. The modification is made by the introduction of the generalized body concept. This modified algorithm allows a 44% computational saving over the current optimized method.
능동자기베어링 시스템의 제어기 설계 및 불균형 진동 분석
강종규,신우철,홍준희 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
Active magnetic bearings (AMB's) have become practical in many industrial fields and numbers of studies for magnetic bearing systems have been reported. However, AMB systems are open-loop unstable and thus require feedback control for robust stabilization and performance. In this paper, first, a rotation of the rotor around the inertial axis is considered and a rigorous modeling of a magnetic bearing system in which the rotation of the rotor is on its axis of inertia is developed. Next, to stabilize the AMB system a PID controller is used and experimentally analyze its rotational response.