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구정완,오민화,이승한 가톨릭대학산업의학센타 산업의학연구소 1991 韓國의 産業醫學 Vol.30 No.2
Near point distance for both eyes of 71 healthy subjects. who no special eye conditions, were measured in order to clarify their distribution form and to select a measure that is suited to continuous observation of visual fatigue of VDT workers. The results were as follows: 1. Near point distance for both eyes(appear. disappear) followed normal distribution only after natural log-transformation(Shapiro-Wilk test). 2. The variance and the coefficient of variation of near point distance(appear) were 0.04 and 4.13, respectively, while they were 0.08 and 6.30 in near point distance(disappear). The findings suggested that near point distance(appear) could be a preferable measure to near point distance(disappear)in the sequential monitoring of visual fatigue. 3. The mean near point distance(appear, disappear)for both eyes of study subjects were 138,82 mm in the age4 group of 20-29 years and were 156,97 mm in the age group of 30-39 years. respectively.
Poly(4,9-di(p-acetylphenyl)diadamantane)의 합성
具廣謨,具承榮,張晋圭 慶一大學校 1996 論文集 Vol.13 No.2
4,9-Di(p-acetylphenyl)diadamantane monomer was synthesized by Fridel-Craft acetylation on 4,9-phenyldiadamantane with acetyl chloride in CS². The 4,9-diphenyldiadamantane was prepared from diadamantane and benzene in the presence of t-butyl bromide and AlCl³. The polymerization of the difunctional ketone, 4,9-di(p-acetylphenyl)diadamatane monomer under McMurry coupling reaction condition gave white powderic polymer. The chemical structure of the resulting polymer was characterized by ¹H NMR, ¹³C NMR, IR and TGA. Oligomeric polymers were slightly soluble in halogenated solvents, and the polymer was almost insoluble in any organic solvent. The temperatures of 10% weight loss were 492℃ under nitrogen and 429℃ in air at a heating rate 20℃/min.
Rutin-Fe(III) 착화합물 형성에 대한 pH 효과
구난숙,안승요 대전대학교 기초과학연구소 1997 自然科學 Vol.8 No.1
Rutin-Fe(Ⅲ) 착화합물 형성에 미치는 pH의 영향을 시험하였다. pH가 증가함에 따라 rutin-Fe(Ⅲ) 착화합물의 최대흡수파장은 2단계로 이동되었다. pH3.7∼4.2 까지는 최대흡수파장이 385nm로 일정했으며, 담록색을 띄었다. pH 4.3∼4.9 범위에서는 pH가 증가할수록 착화합물의 색이 담록색에서 암록색으로 짙어졌고, 파장도 385nm에서 399nm로 이동되었다. pH 5.0∼5.6 까지는 녹갈색의 착화합물이 형성되었으며, 최대흡수파장은 399nm였다. Rutin과 Fe(Ⅲ) 이온의 몰비도 착화합물 형성시 pH의 영향을 받았다. pH 3.6 이하에서는 몰비를 구하기 어려웠으나, pH3.7∼4.2 사이에서 1:1 착회합물이 존재함을 알 수 있었다. pH 4.3∼4.9에서는 1:1과 1:2 착화합물이 공존했고, pH 5.0 이상인 용액에서는 1:2 착화합물이 형성되었다. Rutin-Fe(Ⅲ) 착화합물 형성에 대한 산의 저해효과를 시험해 본 결과 구연산, 주석산,인산, 수산의 순서로 저해효과를 나타내었다. The effects of pH on the formation of rutin-Fe(Ⅲ) complex were examined by spectrophotometric method. With an increase in pH(2.6-6.0), the wavelength of maximum absorption and the color of rutin-Fe(Ⅲ) complex were changed. In the pH range between 3.7 and 4.2, the wavelength of maximum absorption was shifted from 385nm to 399nm and the color was dark green. Brownish green complex, having the wavelength of maximum absorption at 399nm was formed in the pH range between 4.9 and 5.6. The molar ratios at which rutin was combined with Fe(Ⅲ) ion were influenced by pH. The molar ration of rutin to Fe(Ⅲ) was 1:1 in the pH range between 3.7 and 4.2 and 1:2 above pH 5.0. In the pH range between 4.6 and 4.9, 1:1 and 1:2 complexes were formed. Below pH 3.6, the molar ratio was not determined definitely. In addition, the inhibition effects of several acids on the rutin-Fe(Ⅲ) complex formation were observed. The most effective acid was cirtic acid.
구경완,이근복,장종국,김재홍,김영환,최제영,이승훈 永同大學校 1997 硏究論叢 Vol.3 No.1
본 연구는 각종 첨단 기자재를 활용한 강의 현대화 방안을 모색함으로서 공학교육의 효율성을 도모하고 학생들의 학습동기를 유발하여 창조적 능력을 갖츤 전문기술 인력을 양성하는 데 도움을 주고자 하는 것이다. 이를 위하여 현행 공학교육의 현황과 문제점을 분석하고 강의 현대화 사례를 조사하여 본 연구의 기초자료로 삼고자 하였으며, 학부·전공별 강의 현대화 추진 실태분석 및 개선방안을 모색한 후 이상의 연구결과를 종합하여 향후의 강의 형대화 추진방향을 걸정하였다. This study aims to help bring up the well-skilled and creative engineers by searching the modernization of education using various high technology facilities. For this, we analyzed the general condition and problems of current engineering education and surveyed the case study of the modernization of education as basic study. After analyzing the existing situation of promotion searching the proper improvement methods of it, we proposed the new direction of the modernization of education from now on.
구정완,이승환,이자영 가톨릭대학산업의학쎈타 산업의학연구소 1991 韓國의 産業醫學 Vol.30 No.5
In order to investigate the effects due to visual display terminal(VDT) work of banking operations, the questionnaire survey for subjective eye symptoms was carried out on 378 bank clerks who had been engaged in VDT work for various length of work hours. The results were as follows: 1. Of the 17 items of questionnaire, the highest percentage was accounted for by 'eye strain' (61.1%),follwed by 'feel pressure in eyes'(33.3%),'eyes feel ache' (26.7%),'eyes feel heavy'(21.4%) and 'blurred vision of objectl'(16.7%) in the order of sequence. 2. The average weighetd score of subjictive eye symptoms was 13.75, 14.39, 16.78 and 13.13 in the age groups of less than 25,25-29, 30-34, and 35-44 years, respectively, it was significantly increased from the age group of less than 25 years to 30-34 years. Also, it was significantly increased according to increasing with work duration. 3. The average weighted score of female was larger than that of male and the score of green color was larger than that of black-white color by the color of cathode ray tube display. 4. Aggravating time of subuective symptioms was during the end of month in period of a month, a monday in a day of week and on duty (P.M.) in a daily work.