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변용규,조형석,Byun, Yong-Kyu,Jo, Hyung-Suck 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.2
In this paper, a new kinematic structure of a parallel manipulator with six Cartesian degrees of freedom is proposed. It consists of a platform which is connected to a fixed base by means of 3-PPSP(parameters P, S denote the prismatic, spherical joints) subchains. Each subchain has a link which is concected to a passive prismatic joint at the one end and a passive spherical joint at the other. The spherical joint is then attached to perpendicularly arranged prismatic actuators which are fixed at the base. The spherical joint is then attached to perpendicularly arranged prismatic actuators which are fixed at the base. This arrangement provides a basis to control all six Cartesian degrees of motion of the platform in space. Due to its efficient architecture, the colsed-form solutions of the inverse and forward kinematics can be obtained. As a consequence, this new kinematic structure can be servo controlled using simple inverse kinematics becaese forward kinematics allows for measuring the platform's position and orientation in Cartesian space. Furthermore, the proposed structure provides an effective functional workspace. Series of simulations are performed to verify the results of the kinematics analyses.
안태옥,변용규,An, Tae-Ock,Byun, Yong-Kyu 한국음향학회 1994 韓國音響學會誌 Vol.13 No.e2
본 연구는 단어 패턴 중 유사한 특성의 정보에 기초를 둔 DMS(Dynamic Multi-Section) 모델을 제안한다. 이 모델은 각각의 단어를 몇 개의 구간(Section)의 시계열로 분할하고, 각각의 구간 모두에 지속 시간 정보와 구간을 대표하는 특징 벡터를 구간의 정보로 등록해 둔 것이다. 단어 패턴에서 모델을 작성하는 절차는 대표 특징 벡터와 지속 시간의 정보를 거리에 따라 반영하면서 단어 패턴과 모델과의 매칭을 반복하여 매칭에 의한 누적 거리가 최소로 되도록 하는 것이다. 제안된 음성 인식 실험을 수행하는 것 이외에도 비교를 위해 DP 방법, HMM 방법 및 MSVQ 방법에 의한 음성 인식 실험을 같은 조건하에서 같은 데이터로 수행하였다. 또한 제안된 DMS 모델을 이용한 음성 인식시에도 DMS/DP 방법에 의한 인식 및 DMS/VQ에 의한 인식률은 89.3%이다. 또한 DMS 모델을 이용한 DMS/DP에 의한 인식률은 95.8%이고, DMS/VQ에 의한 인식률은 96.8%이다. 그러므로, DMS 모델을 이용한 DMS/VQ 방법에 의한 인식이 일반적으로 많이 이용되고 잇는 DP 방법이나 HMM 방법 및 MSVQ 방법과 비교해 볼 때 인식률도 우수하며, 기억 용량 및 계산량도 감소되어, 본 연구에서 제안하는 DMS 모델의 유용성이 입증되었다. This paper proposes a DMS(Dynamic Multi-Section) model based on the information of the similar features in word pattern. This model represents each word as a time series of several sections and each section implies duration time information and typical feature vectors. The procedure to make a model in the word pattern is that typical feature vector and duration time information are reflected in the distance, when matching between word pattern and model is repeated. As the result of it, the accumulated distance by matching is to be minimized.
김정주,전정일,변용규,노광춘,정정주,전태건,Kim, Chung-Joo,Chun, Jeong-Il,Byun, Yong-Kyu,Ro, Kwang-Choon,Chung, Chung-Choo,Jeong, Tae-Gun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
As track density needs to increase to the order of 10, 000 tpi, the suspension has become a critical component in hard disk drives. One of the main obstacles to attain high track density is the structural resonances of the suspension in lateral direction. We investigate the suspension dynamics through the experimental modal analysis and the finite element method. An LDV (Laser Doppler Vibrometer) is employed to measure the response of the suspension which is excited by a shaker and an inpulse hammer for the free condition and the loaded condition, respectively. After comparing the experimental and numerical results, we study how the initial geometry of the bend region affects the suspension dynamics. It is found that the natural frequency of the sway mode decreases as the bend ratio and the bend angle increase. The shape of torsional mode changes as the mass of a slider increases, resulting in a local decrease in the natural frequency.
마이크로 드라이브의 충격 저감을 위한 충격 전달 경로 절연 기법
김도균(Do-Gyoon Kim),이준화(Jun-Hwa Lee),김광준(Kwang-Joon Kim),변용규(Yong-Kyu Byun),한우섭(Woo-Sup Han),홍민표(Min-Pyo Hong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
To improve the shock resistance of the microdrive under non-operating conditions, an isolator was attached to the contacting part of the microdrive. Through FE analysis, design parameters for satisfying the allowable acceleration level of the spendle motor bearing part were presented, which is a most possible critical part of the microdrive.
변용규 서울産業大學校 1986 논문집 Vol.23 No.1
The LSI chips for speech synthesizer are available in many applications since the anouncement of "Speak and Spell", Texas Instrument, 1978. This paper surveys the development of the LSI chips for speech synthesizer up to now, and also discuss the future trends and some problems on them.
邊龍圭 서울産業大學校 1980 논문집 Vol.13 No.1
The design of a versatile active filter which has three functions of high-pass. band-pass, and lowpass is studied and this multifunction filter is realized. The experimental results of the characteristics of the filter has shown to be good.
ARQ를 갖는 상호 연결된 토큰링 네트워크의 전송지연 시간 해석
변용규,안태옥 서울産業大學校 1990 논문집 Vol.32 No.1
In this paper, we analyzes the transfer delay time of the interconnected token ring network with ARQ- single rings are interconnected-to transfer not only interrings but also outer-rings. We assume the same token rings to be interconnected, the same average frame arrival rates on all station, the same frame arrival rates when the station is outer-ring and error recovery. Therefore, we analyzes transmission performance on the transfer delay time.