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.

유기용제 폭로가 여성 근로자들의 월경에 미치는 영향

김대환,이채관,김휘동,강동묵,문덕환,김정호,손병철,이창희,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.1

유기용제는 산업장에서 널리 사용되고 있다. 특히 여성근로자들의 폭로기회가 증가하고 있으며 이로 인한 자연유산, 수태능력 감소, 월경이상 등이 보고되고 있다. 따라서 유기용제 폭로가 여성근로자들의 월경에 미치는 영향을 보기 위해 설문조사와 월경주기별 여성생식 호르몬(progesterone, estrogen) 분석을 하였다. 그 결과 폭로군에서 progeterone의 억제효과가 유기용제에 폭로되는 여성근로자들의 다양한 월경이상을 초래할 가능성이 있는 것으로 생각된다. ■ Objectives This study was conducted to evaluate the effects of menstrual function in female workers exposed to organic solvents. ■ Methods Rates of menstrual disorders were studied in 87 female workers with exposure to organic solvents(Cn/Hn-value 0.713) in a factory manufacturing shoes and compared with 83 general female workers who had no exposure to organic solvents, Detailed menstrual and reproductive histories were obtained by personal interview using structured questionnaire, and plasma concentrations of progesterone and estrogen were assayed by radioimmunoassay(RIA). ■ Results The rates for menstrual irregularity, menstrual duration, blood clot in menstrual flow and dysmenorrhea were not significantly different in both groups. Number of using menstrual pad was significantly higher and the plasma level of progesterone during 6-11th day of menstrual cycle was significantly lower in the exposed group compared with non-exposed group(P<0.05). ■ Conclusions It seemed to be suppression effect of organic solvents on the reproductive hormones(progesterone and estrogen) in female workers. But there was no evidence that menstrual disorder was likely to result from exposure to organic solvents, because other behavioral, psychological and work related factors may also affect menstrual function.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

원위 대퇴골의 고립성 골연골종에서 발생한 속발성 연골 육종 1례 보고

정필현,황장수,강석,김용민,오형호,채동주,김종필 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

연골육종은 비교적 서서히 자라며 늦게 전이하는 악성 연골 종양으로 알려져 있다. 골 연골종에서 발생한 속발성 연골육종은 발생빈도는 드물며 타부위로의 전이가 적고 악성도가 낮은 경우가 많아 적합한 수술적 치료로서 좋은 예후를 보이는 것으로 보고되고 있다. 본 동국대학교 정형외과학 교실에서는 우측 대퇴골 원위부 골간단부에 생긴 고립성 골 연골종에서 이차적으로 발생한 연골육종을 치험한 바 문헌고찰과 함께 보고하는 바이다. A case of Secondary Chondrosarcoma Arising from Solitary Osteochondroma of the Distal Femur Department of Orthopaedic Surgery, College of Medicine, DongGuk University Phil Hyun Chung M.D., Jung Su Hwang M.D., Suk Kang M.D., Yang Mln Kim M.D., Hyung Ho Oh M.D., Dong Ju Chae M.D., Jong Pil Kim M.D. Chondrpsarcoma is a malignant cartilage-forming tumor that grows slowly and metastasis of this tumor occurs in late stage. Secondary chondrosarcomas arising from a solitary osteocartilaginous exostosis are rare and those have a better prognosis than other chondrosarcomas, and they rarely metastasize. We present our experience with a case of secondary chondrpsarcoma arising in solitary osteochondroma of distal metaphysis of right femur with clinical details.

망원경에 대한 초등 예비 교사들의 개념 조사

채동현,양종천,김은영 전주교육대학교 과학교육연구소 2001 科學 敎育 硏究 論文集 Vol.23 No.1

Presevice students' conceptions on the telescope were Investigated. Samples consisted of 63 students in Chonju National University of Education. The open-ended written questionnaire were used. The result were that students' naive theories on the telescope were numerous. For example, 87% students held the idea that when someone salts a object through the telescope, the object could be seen larger. This study was also discussed the teaching strategies to overcome these naive theories on the telescope.

암석종류에 따른 암석층에서의 현장타설 말뚝의 거동

채동석,김명학,윤민승 인제대학교 2010 仁濟論叢 Vol.25 No.1

In this study for the analysis of ultimate bearing capacity of drilled shaft socketed into different rock types, the results of load transfer data of Kimhae bridge, Namhang and Inchon grand bridge were used to compare the measured and theoretical formular values. The most of bearing capacities by the theoretical formular were lower than the results of static load test, which means that the theoretical formular punderestimate the actual bearing capacity of piles. For Kimhae bridge, the amount of maximum settlement was 17.79mm under 1650 ton applied and remaining settlement was 4.71mm. 76.5 percent of side resistance was transfered in sedementary layer, while 23.6 percent in weathered rock layer. To establish the reasonable design method in domestic site, the data of static load test including axial load transfer analysis should be accumulated and analyzed. In recent, new load test like as both direction load test would be used in sites, the ultimate bearing capacity of drilled shaft could be evaluated more precisely.

열확산법으로 만든 CdTe p-n 다이오드의 특성에 관한 연구

채건식,김영국,설정식,전동성 慶南大學校 附設 基礎科學硏究所 1990 硏究論文集 Vol.2 No.-

Single crystals of CdTe were grown by Bridgman method from a melt. They were contained the element of 0.1, 0.15, 0.2mole % In and 0.1mole % P as a dopant respectively. The crystallographic direction of the grown CdTe have zinc blende structure which is(331) plane 2θ=62.6。 in X-ray method. The etch pits on the (100), (110) and (111) surfaces grown to characteristics shapes with E-Ag or PBr was found to consider with the crystallographic direction denoted by simple Miller indices as is depicted schematically. Here the pits on (100), (110) and (111) show rectangular, triangular and conical shapes respectively. The results of PL measurements of undoped and In-doped CdTe showed the maximum peak at 7475 Å and 7503 Å, and P-doped CdTe by thermal diffusion showed the maximum peak at 6943 Å and 7478 Å , the former was shown by Al and the later by phosphorous. The values of the electrical chracteristics have been compared with the Yamada's and we showed the good agreements between them. The thickness if Al thermal diffusion to the CdTe crystals were propotional to the diffusion time. The properties of these cells have good rectification with forward and reverse voltage.

개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성

채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-

The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.

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.