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Thermal Cycling 열처리가 AISI 4330 강의 현미경조직과 기계적 성질에 미치는 효과에 대한 연구
김태일,천성순 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.3
Thermal Cycling treatments have been applied to AISI 4330 steel for improving the strength and impact toughness. The constant and alternate cycling have been applied. Experimental results showed that a remarkable grain refinement can be obtained by thermal cycling treatments. The strength and impact value were increased by constant cycling, but the strength tended to decrease with increasing the impact value in alternate cycling. It was found that the best thermal cycling condition was the fourth cycle of constant cycling, and the grain size was reduced from about 15∼20㎛ mean grain diameter to 2∼3㎛, by this treatment. The grain refinement can be attributed to the low austenitizing temperature and short soaking time due to the rapid heating rate and the accumulation of residual stress during repeated thermal cycling. It is believed that the increase in strength is caused by the grain refinement and fine carbide precipitation, and increase in impact value is mainly due to the reduction of plate martensite which deteriorates the toughness.
옥수수 불검화 추출물(Zea Mays L.)과 후박(Magnoliae cortex) 추출물 혼합물의 치주질환원인균에 대한 항균작용 및 치은섬유아세포 활성도에 미치는 영향
김태일,최은정,정종평,한수부,구영,Kim, Tae-Il,Choi, Eun-Jeong,Chung, Chong-Pyoung,Han, Soo-Boo,Ku, Young 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.1
Zea Mays L. has been known to be effective for improving tissue health and Magnoliae cortex to have effective antibacterial and antimicrobial activity against pathogenic microbes. The purpose of this study was to examine the antimicrobial effects of Zea Mays L. and Magnoliae cortex extract mixtures on periodontal pathogens(Prevotella intermedia, Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Streptococcus mutans )and to examine the effects on human gingival fibroblast cellular activity. Zea Mays L. and Magnoliae cortex extracts and their mixtures were prepared with various mixing ratios (0.5:1, 1:1, 1.5:1, 2:1). These extracts were loaded to periodontal pathogen cultured petri dish for antimicrobial test and also loaded to cultured human gingival fibroblast for cellular activity test. Each test was repeated 3 times and data were analyzed by one-way ANOVA with 95% confidence level. Mixture of these two extracts showed greater amount of inhibition area on periodontal pathogen and more improved gingival fibroblast activity as Zea Mays L. ratio reduced. So, mixture ratio 0.5:1 (Zea Mays L. : Magnoliae cortex) group showed statistical significance in antimicrobial activity and cellular activity among various mixtures(p < 0.05). In conclusion, 0.5:1 (Zea Mays L. : Magnoliae cortex) mixture possessed best gingival fibroblast cellular activity and antimicrobial activity toward periodontal pathogens.
한국의류학회지에 게재된 설문조사 연구의 방법론적 특성 분석
김태일,이미영 한국의류학회 2002 한국의류학회지 Vol.26 No.6
The purpose of this study is to examine methodological issues of empirical research using survey methods in Journal of the Korean Society of Clothing and Textiles. We reviewed 95 articles from Journal of the Korean Society of Clothing and Textiles in 1996, 1998, and 2000. Methodological issues were categorized into four areas: questionnaire and scale development, sampling and collecting data, variable construction, and external validity(generalization). In each area, a check list was made and 95 articles were reviewed based on this list Major findings were discussed and some suggestions were made for future research.