自動車 運轉技士의 勞動疲勞度에 關한 調査硏究

韓光洙,金光鍾,車喆煥 中央醫學社 1983 中央醫學 Vol.45 No.2

The author has investigated the occupational effects of driving upon the general health of drivers with emphasis to the degree of fatigue. The study consisted of 27 bus drivers and 19 taxi drivers. The investigation was performed by objective tests such as flicker test, hearing loss test and white blood cells count and recognition of fatigue was obtained by personal interviews. The results are as follows: 1. Flicker values were reduced gradually as the driving time increased. Significant differences in flicker value were found before and after 8 hours work and after 18 hours work, respectively. 2. Difference of hearing acuity before and after driving was not significant. 3. The numbers of leukocyte were increased significantly after driving. 4. After driving neurosensory fatigue occurred most commonly and was followed by physical and mental fatigue. 5. The rate of mental and physical fatigue was the highest among under 39 age group. In case of neurosensory symptoms, the highest rate was noted in fifth decade group. 6. The shorter the driving career, the greater rate of mental and physical fatigue was found. Neurosensory fatigue was more common in those with longer career.

일련의 2D 영상들을 이용한 3D 정보 추출에 관한 연구

한광수 국민대학교 2003 기초과학연구소 논문집 Vol.22 No.-

일련의 2D 영상들로부터 물체의 3차원 정보를 추출하는 연구는 컴퓨터 비젼에서 중요한 문제이다. 이를 위해 스테레오 비젼, SFF, 초점 정보를 이용한 방법 등이 연구되었다. 본 논문에서는 초점 정보를 이용한 3차원 정보 추출 방법을 연구하였다. 초점 값을 측정하기 위하여 Tenengrad, SMD, SML, FSWM, modified LoG 알고리즘을 적용하였고 그 결과를 비교 분석하여 특정 형태에 최적인 초점 측정 방법을 제안하였다. Reconstruction of 3D shapes from a sequence of 2D images is an important problem in computer vision. The methods to recover 3D information include stereo-vision, shape-from-shading, depth-from-focus and depth-from-defocus. In this paper, we focused on depth-from-focus (MA) method. We used Tenengrad, SMD, SML, FSWM, modified LoG algorithms to calculate focus measure and proposed a best focus measure for certain shapes by comparing the result.

얼굴 특징 추출에 관한 연구

한광수 국민대학교 2002 기초과학연구소 논문집 Vol.21 No.-

디지털 영상에서 자동으로 얼굴과 얼굴의 특징 요소들을 추출하는 작업은 얼굴 검출 및 인식과 이를 이용한 생체 인식 보안 시스템, 캐리커춰 제작 등의 다양한 응용 분야에 필수적인 과정이다. 현재 대부분의 얼굴 인식 시스템은 통계적 방법에 기반하고 있으나 이 방법은 얼굴 각 부분의 특성과 이들의 상호 관계에 대한 표현이 쉽지 않다. 본 논문에서는 얼굴 패턴 표현을 위한 패턴 문법을 이용하여 얼굴의 구조적 정보를 구문 구조로 표현하는 방안을 제안하였다. Automated detection and extraction of facial features from a digitized image is an essential step in various application areas such as security systems using face recognition and caricature generation systems. Most of the current face recognition systems are based on statistical methods which are not adequate to express the facial parts and their relationships. In this paper, a method to express the structural information of a face using a facial pattern grammar is proposed.

크롬酸鹽 製造動勞者의 尿中 크롬量에 關한 調査硏究

韓光洙,金光鍾,車喆煥 고려대학교 의과대학 1986 고려대 의대 잡지 Vol.23 No.1

This study is aimed at investigating the correlation between the chromium concentration in urine of workers and the conditions of exposure to chromium at the factory. The study was conducted in was parts; longitudinal study and cross sectional study. The subjects of longitudinal study were 14 male workers who had been exposed to chromium without any change of their working place for five years from 1977 to 1982. During that time chromium concentrations in their urines were monitored every year. A cross sectional investigation was conducted to 71 male workers in the same factory for two months from May 1982. The investigation on concentration of chromium in the air was conducted during ten months from September 1981 to July 1982. Results of the investigation were as follows; 1. Raw-material-handling section showed highest in geometric mean concentration of chromium in the air with 0. 035mg/㎥ which was followed by sodium-chromate-manufacturing section with 0.010mg/㎥ and sodium-dichromate-producing section with 0.006mg/㎥. 2. Chromium concentration in urines from 71 workers was shown as geometric mean of 0.054mg/l in raw-material-handling workers, 0.046mg/l in sodium-chromate-manufacturing workers and 0.035mg/l in sodium-dichromate-producing workers. 3. The concentration of chromium in urine increased with duration of exposure to chromium in the factory with the moderate positive correlation coefficient (r=0.57, p<0.01). 4. According to the follow-up investigation for five years, concentration of chromium in urine from 14 chromium handling workers showed a significant increase as the period of chromium exposure increases. But it was variable in individual base. 5. The fact reveales that there is a significant correlation among the amount of chromium in urine, chromium concentration in air and duration of exposure. The regression equation was as follows; LogCr-u (ug/l) =S. S34~o&r-A(mg/㎥)+O. 118D(year) +0.905 (p<0.001) 6. Amount of chromium in urine did not revealed any significant difference amongst .age groups, symptom complaints or chest X-ray finding.

Electrosurgery를 이용한 치료증례

이상훈,이광수,한세현,윤재웅 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.3

Electrosurgical technique have been used in dentistry as an aid to soft tissue management for nearly 60 years. However, it was not until the late 1960s that the principles of electrosurgery were understood and improved equipment became available. Electrosurgery is a surgical procedure performed on soft tissue utilizing controlled high frequency electrical(radio-frequency) currents in the range of 1,500,000 to 7,500,000 cyclesper second. The radio-frequency energy used in electrosurgery is able to cut and coagulate tissue because it focuses the energy at the small, active electrode. Advantages of electrosurgery for soft-tissue management during dental procedures include improved hemostasis, ease of tissue modification, improved visibility and so on, but adverse healing response-including necrosis of soft tissue and sequestration of alveolar bone-have been reported. The present report provides examples of treatment of soft tissue and pulp tissue of primary teeth by electrosurgery. The results are as follows ; 1. Electrosurgical techniques can be used for various procedures in pedodontics. 2. Electrosurgical procedures provide improved hemostasis and visibility in the operating field, which enable to remove, reshape, and contour soft tissues easily. 3. In pulpotomy technique, it was difficult to expect the variable pulpal response based on the degree of heat accumulation and the conditions of pulp tissues. Therefore, electrosurgical pulpotomy could not be considered as a method superior to formocresol pulpotomy. 4. A greater degree of dexterity and experiences in manipulation of the electrode is required compared with the conventional scalpel surgery.

噴霧法에 依한 硫化亞鉛 薄膜의 電場發光 調査

손연규,윤지홍,권태향,한광수,이자현 안동대학교 기초과학연구소 1991 基礎科學 硏究論文集 Vol.2 No.1

The study of Electroluminescence has been begun with that the two Germans, B. Gudden & R. W. Pohl in 1920 examined the remaining lights by dint of adding Electric Field at the fluorescent substance, and from 1952 the study became brisk, in 1960 made a peak, and afterward it was diminished. The above facts were appeared through H. E. Ivey`s investigation. The cause was it that the light-efficiency and the brightness were very pessimistic, though the beginning of EL-Study was given in the development of illumination. In 1950, however, with the initiative that C. W. Jerome of Sylvania Co. deviced and announced EL-Lamp, EL-Fluorescent substances were embed and merchandised as EL-Panels, and after a while it was applied to EL-Lamps, Expression Apparatuses, Light Amplifier, Logic Circuit and so on, with which the use frequency got high, and it has been developed as a promising Electronic Industry. But in our country, considering the various conditions, in order to find out the possibility of EL-Production within the home country, Impurity was introduced to ZnS powder, EL of ZnS : Cu, Cl & ZnS : Cu, Mn, Cl could be manufactured, and surveying the Voltage Characteristics, the Frequency Characteristics, and the Spectral Response of the manufactured things, the fundamental technique-problems about the composition of ZnS powder, the introduction of impurity, the formation of thin-thickness, and the construction of Cell, etc were solved gradually. 1. The quantity of Cu must commonly be more one order than in the use of Photoluminescence, as a whole 10(-3)gm,atm/mole ZnS is fitted, and Mn suitable in about 10 times of Cu. 2. Yellow color must dope Cu as well as Mn, when the quantity of Cu fixed to a certain amount, in case that the quantity of Mn is decreased, it be turned into Yellow color, if it is increased, it be taken Orange color. 3. In vacuum flowing HzS gas and baking at the moment, it is said that EL of which brightness is high, but in the air we can secure ZnS : Cu, Cl EL. only. 4. In referring to the conditions 1, 2, 3, I can infer that EL-manufacture if possible in our country.

最近 8年間의 精神神經科 入院 外來 및 患者에 對한 統計的 考察(1960年∼1967年)

李哲奎,盧英一,張煥一,金明源,任允明,韓東洙,吳承煥,金光日 大韓神經精神醫學會 1969 신경정신의학 Vol.8 No.1

1) The number of the out-and in-patients had increased year after year (Table Ⅰ & Ⅲ). 2) Schizophrenia was the greatest number of the in-patients and its rate to whole was 49.1 percent, and neurosis was the greatest number of the out-patients and its rate to whole was 41.66 per cent (Table Ⅰ & Ⅶ). 3) In in-patients, hysteria revealed relatively large in percentage as 11.8% than the other groups (Table Ⅰ). 4) The rate of the male hysteria patients to all male patients was 3.5 per cent and the rate of female hysteria was 20.5 per cent (Table Ⅱ). 5) In in-patients, all the patients of general paresis and alcoholism were only males in sex(Table Ⅱ). 6) In in-patients of schizophrenia, the ratio of the male patients to the female patients was 57.0 : 43.0, but the each rate of each total numbers of the all diseases of the both sexes was almost same (Table Ⅲ). 7) The largest age group of the all patients was between 21∼30 years old, and the next was between 31∼40 years in in-patients (Table Ⅲ). 8) The largest age group of schizophrenia patients was between 21∼30 years and that of M.D.R patients was between 31∼40 years in in-patients (Table Ⅲ). 9) In in-patients of hysteria, the largest age group was between 31∼40 years, and the next was between 21∼30 years (Table Ⅲ). 10) The results of treatment in in-patients were as followings; Recovered; 27.6% Much improved; 43.1% Slightly improved and no changed; 28.2% (Table Ⅳ) 11) The results of treatment in schizophrenia of the in-patients were as followings; Recovered; 19.1% Much improved; 48.3% Slightly improved and no changed; 32.1% (Table Ⅴ) 12) The mode of treatment had been somewhat changed during last 8 years from 1960 to 1967 in treatment of the in-patients (Table Ⅵ). (1) The combined therapy of tranquilizers and EST had been increased, but the therapy of tranquilizer alone or EST alone had been decreased, compared to 1960. (2) The therapy of ICT in the treatment of in-patients had been much decreased.

AUTOMATED VISUAL INSPECTION USING SYNTACTIC PATTEERN RECOGNITION

Hahn, Kwang Soo 수원대학교 기초과학연구소 1992 基礎科學論文集 Vol.1 No.-

Automated visual inspection involves complex image processing and analysis. The syntactic approach for image processing uses image grammars to describe images and a parser to recognize images. Representation of images in syntactic form facilitates parsing of images so that defects can be identified as syntactical errors in the same way that programming errors are detected by a language parser. In this paper, an automated visual inspection system based on syntactic pattern recognition is proposed.

고속 고정도 영상 정렬 알고리즘

한광수(Kwang-Soo Hahn) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B

영상 정렬은 다양한 영상 처리 응용 분야에서 기본적으로 요구되는 작업으로 산업체에서 영상 처리 기술을 이용한 많은 자동화 시스템들은 고정도의 실시간 영상 정렬을 필요로 한다. 본 논문에서는 영상에서 명암 값이 급격히 변하는 경계선 부분의 미분 방향 정보를 특징으로 이용하여 밝기 변화가 있거나 초점이 흐린 영상도 빠르고 효율적으로 정렬할 수 있는 알고리즘을 제안하여 고속, 고정도 영상 정렬 시스템을 구현하였다.

컴퓨터 비젼을 이용한 정밀 측정 장비의 줌 렌즈 캘리브레이션

한광수 ( Hahn Kwang Soo ),최준수 ( Choi Joon Soo ),최기원 ( Choi Ki Won ) 한국인터넷정보학회 2005 인터넷정보학회논문지 Vol.6 No.5

본 논문에서는 컴퓨터 비전을 이용하는 정밀 측정 장비인 VMS(video measuring system)에서 줌을 서보 모터(servo motor)로 제어하는 자동화된 줌 렌즈를 보정하기 위한 효율적인 방법을 소개한다. VMS에서 사용하는 줌 렌즈는 초점과 조리개가 고정되어 있기 때문에 줌의 변화에 영향을 받는 이미지의 중심과 픽셀의 가로, 세로 크기에 대하여 보정한다. 줌 렌즈의 모든 줌 제어 단계에 대하여, 모든 카메라 변수 값들을 계산하기 위해서는 많은 계산량과 저장공간이 필요하다. 이런 문제점들을 해결하기 위하여, 효율적인 계산과 저장공간을 위하여 최소 단계의 줌 단계에 대한 보정으로도 모든 영역의 줌 단계에 대한 보정 값들을 계산할 수 있는 방법을 사용해서 VMS에서 효율적이고 간단한 줌 렌즈 캘리브레이션 방법을 제안한다. Precise visual measurement applications, like video measuring system (VMS), use camera systems with motorized zoom lens for fast and efficient measurement. In this paper, we introduce an efficient calibration method for zoom lens of VMS controlled by servo motor. For the automated zoom lens calibration of the VMS, only zoom lens setting needs to be calibrated and parameters calibrated by zoom lens settings are image center and pixel size changed by zoom levels. The extrinsic parameters, like focus and iris, do not need to be calibrated since the parameters are usually fixed. It needs a lot of time and effort to calibrate the camera for all the different zoom levels. In this paper, we also propose an efficient and fast zoom lens calibration method, which calculates the calibration parameters of the zoom lens settings for the minimum number of zoom levels and estimates other parameters for the uncalculated zoom levels using the interpolation of the calculated parameter values.