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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.
이장명,권오상 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To decide best sound quality with given audio system in the automobile, several factors should be considered such as the positioning of the speakers. the boundary condition of the wall, the dimensions of the room, etc.<br/> Among of these factors, the positioning of the speakers has been considered to find better location of the speakers. In establishing the test system, one regular microphone has been used instead of using the dummy head.<br/> It has been verified for the suggested location using the subjective test by 10 people.<br/>
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.
자동차용 흡.차음재의 성능분석을 위한 통계적 에너지 기법의 적용
이장명,이준,김대곤 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.1
Interior parts of a vehicle are getting important to reduce interior noise. Therefore, prior analysis of cabin noise related with interior parts are necessary at first design stage. Recently, Statistical Energy Analysis(SEA) has been suggested as a possible way for high frequency range noise analysis of interior parts. The validity of noise analysis with SEA to interior parts has been preyed by comparing with experimental result, and the developed method with SEA has been applied in finding optimized interior parts package.
단일 홀센서 힘반영 조이스틱을 이용한 모바일 로봇 원격제어
이장명,전찬성,조승근 한국로봇학회 2006 로봇학회 논문지 Vol.1 No.1
Though the final goal of mobile robot navigation is to be autonomous, operators intelligent and skillful decisions are necessary when there are many scattered obstacles. There are several limitations even in the camera-based tele-operation of a mobile robot, which is very popular for the mobile robot navigation. For examples, shadowed and curved areas acnnot be viewed using a narrow view-angle camera, especially in bad weather such as on snowy or rainy days. Therefore, it is necessary to have other sensory information for reliable tele-operations. In this paper, sixteen ultrasonic sensors are attached around a mobile robot in a ring pattern to measure the distances to obstacles. Acollision vector is introduced in this paper as a new tool for obstacle avoidance, which is defined as a normal vector from an obstacle to the mobile robot. Based on this collision vector, a virtual reflection force is generated to avoid the obstacles and then the reflection force is transferred to an operator who is holding a joystick to control the mobile robot. Relying on the reflection force, the operator can control the mobile robot more smoothly and safely. For this bi-directional tele-operation, a master joystick system using a hall sensor was designed to resolve the existence of nonlinear sections, which are usual for a general joystick with two motors and potentiometers. Finally, the efficiency of a force reflection joystick is verified through the comparison of two vision-based tele-operation experiments, with and without force reflection.