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변재동,손용선 고려대학교 공학기술연구소 1986 고려대학교 생산기술연구소 생기연논문집 Vol.22 No.1
The effects of excess TiO₂ and sintering atmosphere on the grain growth and on the dielectric properties of SrTiO₃-based boundary layer ceramic capacitors were investigated. The ceramic capacitors were prepared by doping the strontium titanate having excess amount of TiO₂ with 0.3 mole %, Nb₂O₃ and sintering them in inert gas atmosphere (e.g., nitrogen gas atmosphere). Te sintered bodies were annealed at 1100℃ for 20 to 90 min. in air. These ceramics are characterized by the peculiar structure that every semiconductive grain is surrounded by thin insulating layer which is formed by the solidifcation of Ti-rich liquid phase existing at sintering temperature and oxidation of this in the air. These capacitors exhibited excellent dielectric properties. In the present study, SrTiO₃-based boundary layer capacitors having apparent permittivity of 90,000 to 145,000 with loss factor of 1 to 4% measured at 1 ㎑ were obtained. It was also found that the grain growth behavior of SrTiO₃-based ceramics with excess TiO₂ was sensitively affected by the atmosphere and by the preheating before the sintering.
산업장 근로자를 대상으로 실시한 한방 건강검진의 만족도
한현정,정재열,권소희,손용선,장두섭,이기남 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2
The examinees who received oriental and western health examination both and submitted questionnaire were 257 workers in workplace for 1 month during health examination for industrial workers. The research was to compare the satisfaction of oriental and western health examination by the questionnaire. The data that were collected by health examination were analyzed into frequencies, ANOVA, T-test with use of SPSS 10.0 program by the research purposes. The results were as follows: 1. Health examination in satisfaction comparison by the general characteristics of subject was significant in oriental health examination for the subjects who had 9-10 working hours(P〈0.05). 2. The workers who had high confidence in result of health examination, affirmative thinking for requirement of health examination, arbitrary decision for receiving the health examination, had high satisfaction in oriental and western health examination both, It was statistically significant difference. 3. For the difference in subjective health condition's recognition, the subject who answered " Healthy" had high satisfaction in western health examination, and it was statistically in western health examination, and it was statistically significant The subject who answered "Healthy" for the early detection of disease had high satisfaction in western health examination, The subject who answered skeptical for the early detection of disease had high satisfaction. in oriental health examination and it was statistically significant. 4. The respondent who said "Yes" for the question, whether you know about oriental health examination or not before receiving oriental health examinatgion had relatively high satisfaction For the question about including of oriental health examination continuously in the coming future, the subject who replied affirmative answer had high satisfaction in average, and it was significant difference(P〈0.05). 5. For the question that will be needed in the item of oriental health examination, the highest item was the requirement of specific oriental health examination for various diseases, followed by the requirement of medical specialist for individual need of medical examination by the item, and the prescription of herbal medicine, the medical examination of cancer, the interview for folk remedies, the parallel treatment for acupuncture cupping, etc, the medical examination for adult disease, the requirement of room for medical examination etc.