速度計測用 空間 filter의 設計論的 考察

盧度煥 全北大學校 1989 論文集 Vol.31 No.-

A new method of non-contact speed measurement is described. The basic principle of the method is to observe the natural irregularity of moving object through a set of parallel slits, which forms a kind of spatial filter in that it picks up particular spatial-prequency components from the irregularity. Then, the object motion generates a narrow-band random signal whose center frequency is proportional to the object spped. In this paper, the spectral density function is evaluated based on the assumption that the irreguarity is two-demensional randam process, and the dependence of filtering characteristics on parameters such as width, length, interval and the number of slits is analyzed:the results imply that the set of parallel slits acts as a narrow band spatial filter.

計測用의 狹帶域 通過 空間 filter의 最適化에 關한 考察

盧度煥 全北大學校 1991 論文集 Vol.33 No.-

In the velocity measurement using spatial filter, the parallel-slit forms a kind of narrow-band-pass spatial filter, and its selectivity is defined by the ratio of center frequency to frequency width about spatial frequency characteristics. And it is desirable that the selectivity is as large as possible. In this paper, from the above point of view, the problem of the narrow-band-pass optimal spatial filter is considered. The optimal problem is no maximize the selectivity for the fixed slit-number N, with which the frequency width is defind like a standard deviation of frequency characteristics. It is shown that this problem is equivalent to minimizing the quadratic from about a certain matrix A, and its solution is the eigen vector corresponding to the minimum eigen value of matrix A. Besides, the change of the selectivity is discussed when the random error exists in realizing the weighting function as a spatial filter.

속도계측용 공간 Filter의 설계론적 고찰 ( A Study on the Design Method of Spatial Filter for Non-Contact Speed Measurement )

노도환,김동용,김성중 대한전자공학회 1988 대한전자공학회 학술대회 Vol.1988 No.1

사영 기하학을 이용한 3차원 계측 시스템의 교정방식에 관한 연구

盧度煥,崔成求 全北大學校 1994 論文集 Vol.37 No.-

The 3-dimensional measurement using stereopsis system must achieve a camera calibration. So far, the 3-dimensional calibration technique that uses two-dimensional grid paper and the non-linear least square method has been developed and tested. But this method is inefficient because it has many calculation procedures and difficulty with analysis by a non-linear. Therefore, this paper proposes the projective geometric method which produces the calibration parameter by vanishing point. The vanishing point is producted by a cross ratio and parallel line pairs. The results of the computer simulation show utility of the proposed method.

악관절 장애에 대한 문헌적 고찰

노도환 ( Doh Hwan Roh ),이명종 ( Myeong-jong Lee ) 한방재활의학과학회 2005 한방재활의학과학회지 Vol.15 No.3

Objectives : The purpose of this investigation is to study the influence of the temporomandibular joint(TMJ) subluxation on TMJ disorder or whole body symptom. Methods : I had researched various journals and books for TMJ disorder, occlusion, occlusal appliance, biomechanical chain. Results and Conclusions : 1. TMJ disorder is caused by muscle hypertension or contracture, dental occlusal problem, subluxation of around constructure, dental parafunctional activity etc. 2. TMJ disorder is made diagnosis by general examination, simple X-ray, low leg analysis etc. 3. TMJ subluxation can be cared by exercise guide, lateral pterygoid muscle release, manuplation, occlusal treat, treatment and diagnosis based on over all analysis of symptoms and signs. 4. The cause of the TMJ disorder in the oriental medicine is an external trauma, wind-evil, cold-evil. wetness-evil and the deficiency of vitality-blood energy or liver-kidney essense. 5. The treatment of the TMJ disorder in the oriental medicine is manuplation, acupuncture and moxibustion, oral medication, external application, fixation method. If occlusal treatment is used additionally, we can hope more effect.

총백산이 비만유발 흰쥐에 미치는 영향

노도환 ( Doh Hwan Roh ),이명종 ( Myeong Jong Lee ) 한방재활의학과학회 2006 한방재활의학과학회지 Vol.16 No.3

Objectives : This study was performed to investigate the efficiency of Chongbaek-san(Congbai-san) on the Weight changes and the histological changes in Peri-Epididymal Fat, the biochemical changes of blood serum in obese rats induced by high fat diet. Methods and Materials : Experiment animals were divided into 3 groups; normal group(normal diet, non-treated), obese group(high fat diet, non-treated) and Chongbaek-san(Congbai-san) oral feeding obese group(high fat diet, treated). Results : Chongbaek-san(Congbai-san) was investigated effects of Total Body Weight, serum Glucose and Insulin content, Total Cholesterol and Triglyceride, HDL-Cholesterol, LDL-Cholesterol content, Total Lipid and free fatty Acid content, Leptin and Uric Acid, SGOT, SGPT content, the histological changes in Peri-Epididymal in animal test. However there was no significant difference in Insulin and HDL-cholesterol. Conclusions : These results indicates that Chongbaek-san(Congbai-san) showed the treatment effects on the obesity resulted from high fat diet in rats.

A Study on Displacement Measurement for High Resolution Utilizing Photo-Sensor Array

Rho, Do-Hwan 全北大學校 1992 論文集 Vol.34 No.-

본 논문은 變位計測의 高分解能化, 高精度化를 꾀하기 위하여 길이의 精密測定에 넓게 이용되는 Vernier calipers의 測定原理를 도입하여 새로운 변위측정 알고리즘을 제안하였다. 즉, 기본적인 계측수법인 合致法의 測定構造와 測定 알고리즘을 論理的으로 分析하여, main scale과 sub scale을 各各 發光素子列과 受光素子列로 置煥한 光學的 變位計測系를 구성하여 기준 sacle의 最小 pitch를 능가하는 分解能으로 變位測定이 가능한 측정알고리즘을 제안하였다. 실제로 laser diode의 光束을 photo-sensor array에 scanning하는 試作裝置를 제작하여 測定 알고리즘의 有校性을 실험적으로 검증하였다.

무한원점과 단일 비젼 시스템을 이용한 자율주행을 위한 실시간 GPS 위치 데이터 보정

정준익,노도환 대한전자공학회 2004 電子工學會論文誌-SP (Signal processing) Vol.41 No.06

In this paper, we proposed the GPS position data correction method for autonomous land navigation using vanishing point property and a monocular vision system. Simulations are carried out over driving distances of approximately 60 km on the basis of realistic road data. On a straight road, the proposed method reduces GPS position error by at least 63% within 0.5 m. However, the average accuracy of the method is not presented, because it is difficult to estimate it on other than a straight road in variable conditions. 본 논문에서는 무한원점의 특성과 단일 비젼 시스템을 이용하여 자율 주행을 위한 GPS 위치 데이터 보정법을 제안한다. 실제 도로를 약 60 km의 거리를 주행하며 제안한 방법에 적용한 주행실험 결과를 제시하였다. 제안하는 방법은 직선도로의 환경에서 GPS 위치 오차를 최소 약 63% 이상 감소시켰고, 거리로는 0.5m 이내로 추정되었다. 그러나 곡선도로와 직선이 아닌 산악도로 등의 도로환경에서 정확도를 판별하기 어려운 관계로 직선도로에서의 오차만을 제시하였다.

성분차 색분할과 검출마스크를 통한실시간 교통신호등 검출과 인식

정준익,노도환 대한전자공학회 2006 電子工學會論文誌-SP (Signal processing) Vol.43 No.2

The traffic lights detection and recognition system is an essential module of the driver warning and assistance system. A method which is a color vision-based real time detection and recognition of traffic lights is presented in this paper. This method has four main modules : traffic signals lights detection module, traffic lights boundary candidate determination module, boundary detection module and recognition module. In traffic signals lights detection module and boundary detection module, the color thresholding and the subtraction value of saturation and intensity in HSI color space and detection probability mask for lights detection are used to segment the image. In traffic lights boundary candidate determination module, the detection mask of traffic lights boundary is proposed. For the recognition module, the AND operator is applied to the results of two detection modules. The input data for this method is the color image sequence taken from a moving vehicle by a color video camera. The recorded image data was transformed by zooming function of the camera. And traffic lights detection and recognition experimental results was presented in this zoomed image sequence. 교통신호등 검출과 인식 시스템은 운전자에게 경고와 보조시스템으로 필요한 장치이다. 본 논문에서는 칼라 비젼시스템을 이용한 주행중 실시간 교통신호등의 검출과 인식법에 대해 제안하고 있다. 제안하는 방법은 크게 네 가지로 구분된다. 유사색환경에서도 신호등 빛 검출이 용이하도록 HSI 색 공간에서 채도와 밝기값의 차를 이용하여 신호등의 빛을 검출하는 신호등 검출, 신호등 외곽검출과 검출된 신호 빛을 바탕으로 교통신호등 외곽 후보영역 설정과 세 검출 결과를 토대로 교통신호등을 인식하는 부분이다. 주행중 영상을 비디오 카메라로 녹화하여 제안하는 방법에 적용하여 결과를 제시하였다. 녹화시 카메라의 줌기능을 이용하여 줌에 의한 입력 영상변화시에도 신호등을 검출 및 인식한 결과를 제시하였다.

Design of Coordinate Transformation CGH for Image Rotation

Pan, Jae-Kyung,Rho,Do-Hwan 全北大學校 1992 論文集 Vol.34 No.-

기존의 광신호처리 시스템에서 광학소자가 가지는 단점을 보완하기 위한 좌표변환 CGH를 입력영상 회전을 위하여 설계하였다. 주어진 입력영상에 대하여 임의의 각도로 회전할 수 있으며 여기에서는 입력영상의 90˚회전용CGH를 제시한다 제시한CGH는 제작의 용이성과 유용한 장비를 고려하여 2진 홀로그램 방식을 채택하였으며 Kinoform 등의 CGH방식을 이용할 경우에 보다 효율적인 처리 등이 기대된다. 이러한 영상회전용 CGH는 광을 이용한 Hough변환과 Radon변환 등에 이용 가능하다.