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설수덕,이병선,최재욱,이내우,이수길 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
In an incident using the numerical method of CPQRA (Chemical Process Quantitative Risk Anslysis), it was estimated a risk for the dispersion of toxic materials as MIC, Acrolein and Toluene. Because CPQRA contained a many variation elements in spite of the approval error as the conditions of wind speed, weather stability class and dispersion coefficients etc., we could know that its accuracy is very high and it calculate an effect distance for each concentration, concentration for calculated spots and effect categories and areas in dispersion of toxic materials. Using these data, it would be used of a basic method in the evaluation of a risk degree and the prevention and protection of an incident. Also it would be used to motive for development of new difpersion model at the atmosphere which is near by real conditions for the numerical method of CPQRA, especially it would provide basic information and a development of nontoxic alternative materials in human body.
表內淑,趙榮濟 釜山大學校 附設 體育科學硏究所 1989 體育科學硏究所 論文集 Vol.5 No.-
This study was proposed to explore the present level of personal maladjustment in Pusan elite athletes. In order to achieve the purposed of the study 112 high school male and 68 university male students were selected by systematic sampling from the list of the students in Pusan elite athletes. They were asked for completing a questionnaire of Derogatics' Symptom Check List-go for personal maladjustment. The following conclusion were delineated. In Personal maladjustment, high school maleplayers showed higher personal maladjustment level than that of university male players on the whole. Among them, high school volleyball players, basketball players and university wrestlers showed the highest level of maladjustment personality.
치과용 콤포짓트 레진의 수분 흡수에 따른 압축강도와 굴곡강도의 변화에 관한 연구
정내정,김정욱,이상훈 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.1
콤포짓트 레진의 다양한 성분은 기계적 성질에 많은 영향을 미치고, 수복물 주위의 환경 또한 재료의 성질에 많은 영향을 줄 수 있다. 구강 내에서 수복된 콤포짓트 레진은 항상 수분에 노출되어 있고, 콤포짓트 레진의 매트릭스는 수분을 흡수할 수 있으므로, 그 결과 콤포짓트 레진은 팽창하게 된다. 또한 콤포짓트 레진의 수분 흡수가 표면강도와 마모저항의 저하와 관계된다고 알려져 있는바 저자는 치과용 콤포짓트 레진의 수분 흡수에 따른 압축강도와 굴곡강도의 변화에 관하여 알아보고자 하였다. 재료는 1군을 Z-100(3M, U.S.A.), 2군을 Spectrum(Dentsply, U.S.A.), 3군을 Clearfil AP-X(Kuraray, Japan), 4군을 Pyramid(Bisco, U.S.A), 5군을 Heliomolar(Vivadent, Germany)로 나누어 7일, 30일, 60일, 120일간 증류수에 넣어 37℃에서 보관한 후 Instron 6022(Instron, U.K.)를 이용하여 압축강도와 굴곡강도를 측정하여 다음과 같은 결과를 얻었다. 1.7일, 30일, 60일, 120일로 기간이 증가함에 따라 모든 군에서 압축강도가 감소하였다(p〈0.05). 2.7일, 30일, 60일, 120일로 기간이 증가함에 따라 모든 군에서 굴곡강도가 감소하였다(p〈0.05). 3.Hybrid type인 1, 2, 3군에 비해 matrix 비율이 높은 microfine type인 5군이 강도가 낮았다. The difference of composition of composite resin may affect the mechanical properties of composite resin and the environment is important for the properties of materials. The composite resin restoration is always exposed to fluid in oral cavity and the composite resin matrix is able to absorb water, which is accompanied by some swelling of the composite. The uptake of water by composites has been correlated with decreases in surface hardness and wear resistance. The purpose of this study was to investigate the effects of water storage in 37℃ distilled water after 7days, 30days, 60days, 120days on compressive strength and flexura1 strength of dental composite resin, Z-100(group 1), Spectrum(group 2), Clearfil AP-X(group 3), Pyramid(group 4), Heliomolar(group 5). The compressive and flexural strength were measured by instron machine. The following results were obtained : 1.There were significant reduction of compressive strength as water storage time increased, 7days, 30days, 60days, 120days(p〈0.05). 2.There were significant reduction of flexural strength as water storage time increased, 7days, 30days, 60days, 120days(p〈0.05). 3.Group 1, 2, 3 -hybrid type showed higher compressive and flexural strength than group 5-microfine type which had lower filler contents.
朴來正 弘益大學校 1976 弘大論叢 Vol.8 No.-
When pure cellulose was pyrolyzed at 300℃ under nitrogen current for 2.5hrs, with collection traps of air cooling, water cooling, and dry ice-acetone bath cooling, 12.3% of tar, 0.01% of water-soluble liquid and 0.25% of light oil were collected and 46.9% of carbonized residue was left in the reactor. Also 41.7% of total sample was volatilized into gas. The components of water-cooled and dry ice-acetone bath cooled traps were separated by gas chromatograph with Porapak Q column. The condensate in water-cooled trap was separated into ten peaks in the chromatogram under temperature programming, 120-120℃, 2℃/min. According to the retention time compared with standard alchohols, aldehydes, ketones, and organic acids, methanol, formaldehyde,acetone, acetaldelyde, and acetic acids were primarily identified in both materials.