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2층형 제진 강판을 이용한 온도 조건에 따른 제진재의 손실계수 및 탄성계수 측정
이장명,이준 한국소음진동공학회 2001 한국소음진동공학회 논문집 Vol.11 No.9
The characteristic values of damping materials are variant on frequency and temperature. We measure the characteristic values(loss factor, young\\\\`s modulus) of damping materials in vibration test. We can not measure characteristic values of damping materials by themselves. So, we proposed a method, sticking damping material to thin steel beam and measuring of characteristic values of damping material on frequency and temperature. We didn\\\\`t use constraining layer but we measured characteristic values on conditioning temperature.
이장명,Gi-Gun Nam,Bong-Ki Lee,Jang-Myung Lee 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.4
This paper introduces a novel approach that can provide the three dimensional information about the movement of a spreader by using two CCD cameras and a laser distance measuring unit in order to derive ALS (Automatic Landing System) in the crane used at a harbor. So far a kind of 2D Laser scanner sensor or laser distance measuring units are used as corner detectors for the geometrical matching between the spreader and a container. Such systems provide only two dimensional information which is not enough for an accurate and fast ALS. In addition to this deficiency in performance, the price of the system is too high to adapt to the ALS. Therefore, to overcome these defects, we proposed a novel method to acquire the three dimensional spreader information using two CCD cameras and a laser distance measuring unit. To show the efficiency of proposed method, real experiments are performed to show the improvement of accuracy in distance measurement by fusing the sensory information of the CCD cameras and a laser distance measuring unit.
Weighted-Chebyshev, Nonrecursive, Digital Filter의 設計에 관한 硏究
李章明 釜山工業大學校 1984 論文集 Vol.26 No.-
Two techniques are described which can be in the design of weighted-chebyshev bandpass digital filters. The first Technique is a new initialization scheme which improves convergence in the design of bandpass filters. The second technique is an improved search algorithm which can be used to locate the maxima of the error function. It incorporates square interpolation with a selective step-by-step search as well as the selective step-by-step search proposed by Antoniou recently. The new design method will lead to a little saving in the amount of computation time. To search a maxima of the error function three different error values must be calculated in Antoniou's cubic interpalation, but only two different error values will be required in this paper. To prove thereasonability of this search algorithm, the error function given by initialization scheme, was drawn for each band of a bandpass filter. The superflous maxima are eliminated by rejecting the extra frequencies for which error value is lowest. This improvement is achieved without degrading the robustness of the Remez exchange algorithm to a significant extent and based on the Antoniou's improvement.
이장명 부산대학교 공과대학 1992 工大論文集 Vol.44 No.-
공정자료 집중화를 위한 마이크로프로세서를 활용한 하드웨어적인 설계의 기본을 제시하고 또한 그 운용의 방법을 보여주는 것이 본 논문의 주 요지이다. 공정자료 집중화는 그 사용의 편이성과 자료 자체의 정확성이 함께 요구되어 지므로, 사용의 편의성을 고려하여 상용의 개인용 컴퓨터를 활용하는 것이 바람직하고, 정확한 공정자료의 측정관리를 위하여서는 고유의 단일 CPU Board를 설계해 줄 필요성이 있다. 이 단일 CPU Board는 아날로그의 공정신호를 입력받아 대응되는 물리적 디지탈값으로 변환시켜주는 Analog부분과 전체의 연산 및 제어를 관장하는 Digital부분으로 구성되어 있다. 아울러, 잡음이 신호 레벨보다 큰 공장의 라인에서부터 사무실까지의 Data 전송에 있어서의 신뢰성을 높이기 위한 통신방식이 보여져 있다. 이러한 하드웨어적인 설계 바탕위에 실제적으로 공정관리 시스템의 운용은 어떻게 행해질 수 있는가를 예시해 주고 있다.
Additive White Noise가 添加되어 있는 Image의 Enhancement에 관한 硏究
李章明 釜山工業大學校 1983 論文集 Vol.24 No.2
In image processing field, It is necessary to emphasize and suppress information in a image selectively, with the aim of increasing the image's usefulness. A new enhancement technique involving contrast enhancement and noise smoothing has been developed for computer aided identification of simple images including additive white noises. Only SNR is necessary for the implementation of this technique. These algorithms do not require the use of any kind of transform. All computations are based on selected local statistics. The first step is to obtain the contrast range for each region. Having the contrast range, each pixel is then replaced by a new calculated value. If the contrast range is less than the threshold, the value is replaced by the average of the region. If the contrast range is larger than the threshold, the value is replaced by the sum of the average plus the product of 3, the contrast range and the deviation from the mean. The results indicate that the contrast of the selected signal region may be improved and noise regions smoothed by this procedure. This approach has the advantages of speed simplicity for use in real time digital image processing.
이장명,권오상 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During the analysis of the complicated intake system, the limitaion of the four-pole parameter with I-D theory appears and it is demonstrated comparing with the exact solution. For the intake system analysis, the usage of the BEM is introduced describing its disadvantage, To combine the benefit of the both method, a hybrid method is introduced. This hybrid method consists of the four-pole parameter with I-D theory and the BEM. The developed method is applied into an automobile intake system analysis to get the transmission loss.<br/>