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허찬욱,유병욱,김창석 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
In this paper, a speech recognition method is proposed to resolve the time variation and the frequency variation that are major reasons of decreasing recognition rates of speech recognition. The time variation of speech and the frequency variation is known to differences of vocal cord and vocaltract among men. When LPCs of speech word is divided equally to cope with the problem of the time variation. The frequency variation of speech data can be absorbed by using the fuzzy inference and the artificial neural network. The parrel fuzzy neural network are proposed with combined both systems paralley to get higher recognition rate due to doing a compensation of each system errors. The result in our proposed system is that rates of the PFN 88.5[%].
雙線刑에 의한 正規直交 Laguerre函數의 過應 디지틀 필터 適用에 관한 硏究
허찬욱 진주여자전문대학 1991 論文集 Vol.14 No.-
In real-time digital signal processing, a significant amount of computational effort can be saved if the input signals are represented in terms of orthogonal signal component. This pater proposes an IIR adaptive learning identification method alhorithm and the convergence properties of a discreate normalized system of orthogonal functions from continuous form using bilinear transformations are present. Computer simulations to demonstrate the performance of the proposed algorithm are present that the convergence performance of proposed methed is better than that of the conventioal FIR adaptive learning identification method.
GMAHN 환경에 적응하는 에러 복구기능을 이용한 AODV 라우팅 프로토콜
정찬혁,오세덕,배진승,이기원,장양근,이광배,김현욱,유충렬,하재승 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-
Mobile nodes in ad hoc mobile networks typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper proposes a solution that allows mobile nodes to access the wired Internet and to roam from base station to base station. And we also develop the efficient method that adapts in Global MANET which can be changed over time. It is observed that we can reduce not only error detection time but also network load, thus increasing the data reception rate in Global MANET Environment.
雙線形 Z-變換 方法을 使用한 Butterworth 低域通過 Digital 濾波器의 設計에 관한 硏究
허찬욱 진주여자전문대학 1987 論文集 Vol.9 No.-
This paper simulates to desiging Butterworth Low Pass Digital Filter using the bilinear Z - transform method. Through the computer simulation, the freguenay characteristic of digital filter transfer function which is satisfies the desired spec.
MANET 라우팅 프로토콜 QoS 지원서비스의 성능평가에 관한 연구
鄭燦赫,金鉉郁,李光培,姜景仁,朴京培,劉忠烈,吳世德,裵振勝,趙榮泰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
In this paper, we evaluated two main QoS supporting routing protocol on wireless ad hoc network. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS support service between source and destination becoming a very important issue. Of all routing protocols, DSR and AODV are very important routing protocol in MANET. So we simulated DSR and AODV QoS Routing Protocol Through simulation evaluation tool NS(Network Simulation) based on various environments.
Hamming Window Function을 使用한 FIR 디지탈 濾波器의 設計에 關한 硏究
許纘煜 진주여자전문대학 1988 論文集 Vol.10 No.-
本 論文은 周波數 軸상에서 Hamming Window Function (Hamming 窓 函數)을 使用하여 FIR濾波器를 設計 할 수 있음을 제시하였고, 設計한 濾波器의 特性이 通過帶域에서 ripple 現像이 없이 평탄한 特性을 갖고, 線形位相을 갖는가를 computer simulation을 通하여 조사하였다.
Chebyshev와 Butterworth Digital 濾波器의 Computer Simulation에 관한 硏究
허찬욱 진주여자전문대학 1986 論文集 Vol.8 No.-
In this paper designed Butterworth and Chebyshev Digital Filter using the impulse-invariance method for hardware implementation and frequency characteristic is defined computer simulation. Cut off frequency characteristic is good Chebyshev rather than Butteworth Digital Filter.