소규모사업장 용접근로자들의 소음·용접흄·망간 노출에 관한 연구

김동구,문덕환,이채관,박명희,함성애,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : This study was conducted for the purpose of investigating the level exposure of welders to noise, welding fume and Manganese(Mn) related to this process. Methods and Material : All subjects in this study were welders engaged in CO2 arc and coated arc welding process especially in small-scale enterprises classified by type of manufacture of ship building, repairing and of other fabricated metal products, which is located in Gimhae and Milyang of Kyeongsang province in south Korea. Air sampling of welding fume was measured, shipped and analyzed on the basis of national institute for occupational safety and health(NIOSH) method in U.S. and work environment measurement method established in south Korea. To measure Noise in the work environment, Noise dosimeter was used on the basis of work environment measurement method established in south Korea. Result : This study was performed during a period from January, 2000 to December, 2001 and Results were as follows: 1. Noise level measured in this work environment was higher than national criteria for permissible exposure limit on health examinations related to hearing loss. 2. The concentration of welding fume and Mn in manufacture of ship building and repairing was higher than those in manufacture of other fabricated metal products. 3. In conditions of existing in ventilation system installed and operated, the concentration of welding fume and Mn was slightly lower than those of not existing. 4. In conditions of existing in sufficient air supply from out door into the work place relied on natural exhaust system, the concentration of welding fume and Mn was slightly lower than those of in not sufficient. 5. In all subjects, a rate of wearing ear plug and respiratory mask for dust and fume was lower than that of not wearing. Conclusion : According to above results, this study suggests that more positive work environment managements such as the use of portable local ventilation system, the supply of highly qualified personal protective equipment, and consecutive education and training related to health protection should be need to acquire suitable health protection program for welders engaged in small-scale enterprises in Korea.

龜尾市의 都市쓰레기 處理 行政의 改善에 관한 硏究

채용곤,김희동 대구보건대학 1994 대구보건대학 論文集 Vol.14 No.-

Korea has taken the aim at an economic growth to get rid of absolute poverty in the process of modernization. In result, the national income has been raised by success of economic growth policy of our government, but the quantity of garbage became greatly to increase by rapid urbanization, increase of industrial activities, and increase of national income. So, our govennment policy cecame to be necessary for solving the serious problems related to garbage in every places. Accordingly, this study analyzed the present situation and actual condition of treatment of general and industrial garbages in order to grope for problems by selecting Kumi-city as an object of this study, and this study suggested the reform measures to make a contribution toward the personal development for improvement of health and hygienes, sound democratic citizens, and personal increase in income, by reutilizing the waste materials and by providing the comfortable environment through the rational garbage treatment as well as to make a contribution toward the political, economic and social development through the environmental preservation and efficient utilization of resources by a rational garbage treatment. This study consists of 6 Chapters as follows : In Chapter 1, this study brougnt up questions on the rational and efficient treatment of garbage as well as to make recognize an importance of garbage treatment that is the most serious issue of all the mankind in establishing the purpose, objects, scope and method of this study. Also, this study examined its actual condition and efficient treatment measures of garbages in Kumi-city that is the newly industrializing city on the basis of analysis on the actual conditions from 1980 to 1990(for 11 years) in order to accomplish the purposes of this study. In Chapter 2, this study established the hypothetical model and theoretical basis of investigation. This study emphasized the rational treatment of garbage administration and attributes of object of this study on the basis of the theoretical background. Also, this study divided the garbage administration by public service and administrative approach, and analyzed the theoretical analysis, after grouped for the actual condition of garbage treatment policy. In Chapter 3, this study analyzed the present situation of garbage treatment in Kumi-city. In Chapter 4, this study analyzed each treatment process on the basis of the above analysis. In Chapter 5, this study examined the reform measures on the present problems which occurr in the process of garbage treatment on the basis of investigation and analysis in this study. In Chapter 6, this study suggested the efficient measures in the adminisunation of garbage treatment as emphasizing its importance.

삼각형기반 형상모델러를 이용한 STL의 검증

채희창,김동우 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1

The verification of the STL file is essential to build the confident parts using a RP machine, because the STL file obtained from the CAD software has many errors - the orientation of triangle does not coincide with adjacent triangles or some triangles are omitted, overlpped and so forth. Especially, the STL file translated from the surface model has more errors than those translated from the solid model. In this study, all possible errors were classified with the most general form and the causes of errors were analyzed to verify and correct errors. Using the triangle based non-manifold geometric modeling, these errors were corrected. Especially, this study took the notice of the problem about the intersected triangles and non-manifold properties overlooked in the previous studies. But this study has a penalty on computing time of O(n^2)

고층 건물공사의 양중 계획 지원 프로세스 개발

채희동,장명훈,이현수 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1

The purpose of this study is to develop the process to support and evaluate experts' decision malting on vertical transportation planning in high-rise building constructions. Experts generally carry out the vertical transportation planning by heuristic methods, so there is a possibility that their decisions failed. The failure of the vertical transportation planning can be result in much loss of time and cost. The process presented in this paper evaluates experts' alternatives, organizes the results of the vertical transportation plan, and then leads to the systematic flow of materials and crews.

중학생의 가사노동에 대한 의식 및 참여도에 관한 연구

채금희,최동숙 한국 가정과 교육 학회 2000 한국가정과교육학회지 Vol.12 No.3

The major purpose of this study is to investigate the middle school students' consciousness and their participation of household work. The participants were 540 middle school students but the final data used in this study was 489. For the statistical analysis of this study, frequency, percentage, mean, standard deviation. Cronbach's α coefficient. one way ANOVA. t-test. Duncan's Multiple Range Test and Pearson's correlation were calculated. The results of this study were summarized as fallows : 1.It was appeared that the middle school students' consciousness and their participation of household work was high. 2 According to the household environmental variables. there was not any significant difference in the middle school students' consciousness of household work, but there was significant difference in the middle school student's participation of household work. 3 According to the school environmental variables. there was not any significant difference in the middle school students' consciousness of household work, but there was significant difference in the middle school students' participation of household work. 4 According to the degree of family life satisfaction, there was significant difference both in the middle school students' consciousness and in their participation of household work in whole categories. 5.According to the degree of Home Economics course cognition, there was significant difference both in the middle school students' consciousness and in their of household work in whole categories.

우리나라 정신요양시설의 이용현황 및 평가에 관한 연구

채은희,서동우,이효영 대한보건협회 2003 대한보건연구 Vol.29 No.1

After the Mental Health Act was established at 1995, mental health service in korea has continuously been changed. The demand for long-term mental health care is on rise as the number of patient among population and social costs increases. In addition, as social concern about patient s quality of life enlarged, people give weight to quality management and evaluation of long term mental health care facilities. Through the evaluation of long-term mental health care facilities, the quality of mental health care can be improved and the function of long-tern mental health care facilities will be identified in mental health care system. Therefore this article will be used as a basic data for not only enhancing their service quality, but setting role and function of long-term mental health care facilities in health care delivery system. From the evaluation of long-term mental health care facilities, the eighty percents of a total 55 facilities was high or middle level. Physical environment items were at the highest level in evaluation parts but system management items were at the lowest level. So system management should be improved. The evaluation of long-term care facilities is a chance for checking the system and finding out problems in running the facilities. Also this evaluation will help to identify the role and function of long-term mental care facilities in the health care system.

2-[(4-Cyanophenyl)amino]-3-chloro-1,4-naphthalenedione (NQ-Y15)의 돌연변이원성

김봉희,정기화,유충규,창동신,이기선,전선덕,소동수,채상호,문창규 德成女子大學校 藥學硏究所 2001 藥學論文誌 Vol.12 No.1

2-[(4-Cyanophenyl)amino]-3-chloro-1, 4-naphthalenedione (NQ-Y15) was asssayed for its genotoxic potential by using Salmonella typhimurium reversion assay and in vitro chromosome aberration test on Chinese hamster lung cells. In the Ames test, NQ-Y15 induced his+revertants of Salmonella typhimurium TA 98 and TA 1537, reaching levels twice the negative control values. But, NQ-Y15 induced only his+revertants of Salmonella typhimurium TA 1537 more than twice the control values under the condition with metabolic activation system. In the cytogenetic test on chinese hamster lung cells. NQ-Y15 showed significant chromosomal aberrations, but the incidence was significantly reduced in the presence of metabolic activation.

속도추정에 의한 유도전동기의 벡터제어에 관한 연구

김동희,정경채,김민희,황돈하,이달해 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1

Recently, the vector controlled induction motors are widely used in the industrial AC servo system requiring high accuracy and fast response. However, in the conventional vector control, by using of speed sensors for speed information of the motor, the system design has been restricted. This paper proposes te vector control system based on speed estimation controls motor speed by estimating angular speed of secondary flux linkages from voltage equations of induction motor without speed and voltage sensor. To stabilize the control system for estimation, the ??-axis flux keeps to zero by the compensation control method with state feedback. In addition, the whole control system is designed to be controlled by software in microcomputer. Computer simulations domonstrates that the control characteristics of the proposed vector control system based on speed estimation are satisfactory in both dynamic performance and accuracy.

農家所得을 위한 감의 효율적 이용을 위한 젖산발효

김순동,서정식,상채규,구경희 효성여자대학교 새마을연구소 1984 새마을硏究論文集 Vol.4 No.-

This study was carried out to improve the utility of persimmon fruit by lactic acid fermentation and drying. A strain of Streptococcus lactis was used in the fermentation. The changes in acidity, pH, number of microorganism, and the content of sugar, lycopene and tannin were determined during fermentation. Color of the fermented persimmon was checked by using a colorimeter, while quality of persimmon was evaluated by sensory test. The optimum temperature for lactate fermentation was at 25℃ showing on acidity of 50mg lactate per 100g fresh weight, when 10^7 cells per ml(1% inoclum)of Streptococcus lactis was added as the starter. By sterilization at 1kg/cm^2 for 15 minutes, the fruit was coagulated and colored reddish. The loss of brix degree was 2.3%. The content of fructose was increased while sucrose and glucose 23%, respectively. The rate of tannin and lycopene loss were 32% and 23%, respectively. Tannin slightly inhibited growth of the microorganism. Optimum temperature for drying of fermented fruit was at 60℃ with little variation in color. The fermented and dried persimmon was better in texture and taste than the raisin. From above results, it was clear that quality of persimmon fruit such as texture, and storage characteristics can be improved by lactate fermentation and drying.

톨루엔을 포함한 유기용제의 직업적 폭로로 인한 신경내분비계 영향

이채언,이종태,정의화,손혜숙,문덕환,전진호,강정학,이창희,김휘동,김종한,정귀옥 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.2

Long term occupational exposure to solvent mixtures may cause adverse effects to the central nervous system with neurobehavioral symptoms. And some organic slovents have been suggested to cause impairment of tuberoinfundibular dopaminergic activity and neurochemical mechanisms controlling pituitary secretion. For the purpose of assessing neuroendocrine effects in occupational solvents exposure, hormonal study settings (shoes-manufacturing industry & fishing products industry) and compared with nonexposed controls(33 men, 85 women). Male workers exposed to solvent mixtures had significantly lower plasma level of follicle-stimulating hormone(FSH) than nonexposed male controls. While female workers exposed to solvent mixtures had significantly lower plasma levels of growth hormone(GH), and thyroid-stimulating hormone(TSH) than nonexposed female controls. The results of significant decrease in plasma concentrations of pituitary hormones(FSH, GH, and TSH) in workers exposed solvent mixtures indicate that occupational exposure to solvent mixtures may induce neuroendocrine effects through an effect on hypothalamic pituitary axis.