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불소와 생귀나리아 함유치약의 초기우식법지랑질에 대한 효과
홍석진,박기철,이상대,정성숙,김완규 단국대학교 치과대학 예방치과 1997 예방치과 세미나집 Vol.- No.11
The purpose of this study way to test potential cariostatic benifit of dentifrices containing both fluoride(F) and sanguinaria (SG) in a silica abrasive formula using microbial remin/demin cycle model. Subsurface lesion on bovine extracted enamel specimens were prepared by exposing to a lactate Carbopol buffer system for 44-hours. The specimens were assigned to 7 test groups of 12 specimens each by randomized blocks with VHN stratification. The test groups were a placebo, 2 NaF-silica dentifrice (with and without SG) and four MFP-DCPD dentifrices(different F level). Negative and positive control dentifrices were selected by the guidelines of the American Dental Association. The microbial cyclic sequence and pre- and post-treatment assays were same as described previously[Hong et al., J Dent Res 75:232, 1996]. The results of △ VHN ± S.E. for each group were; placebo, 26.70 ± 2.54; MFP(250ppm F)/DCPD, 42.34±1.90; MFP(1,000 ppm F) plus 2.0% Bamboo Salt(BS.Jukyom)/DCPD, 44.70±3.43; MFP(1,000 ppm F)/DCPD(Fresh Mint), 46.20±2.46; MFP(1,100 ppm F)/DCPD (Colgate), 55.82±4.18; NaF(1,100 ppm)/Silica(Cerst), 84.98±4.17; NaF(1,000 ppm)/Silica plus 0.1% SG(Denta Q), 92.16±5.21. The data were then statistically analyzed using ANOVA for the significance of differences among treatment groups. △ VHNs for groups treated with dentifrices containing 1,000 ppm F from MFP with or without BS were significantly higher than the placebo. The groups treated with dentifrices containing F from NaF/Silica with or without SG had significantly higher(p<0.01) △ VHNs than that with F from MFP/DCPD(p<0.01)). The △ VHNs treated with dentifrice containing both F-SG demonstrated the highest among test groups, indicating that there is an additive benefit in remineralizing the incipient subsurface lesion.
홍석진,박성우 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Numerical simulation for the self propulsion was carried out using FLUENT, commercial CFD code, and the propeller code embedded in WAVIS. The double model flow was concerned for the 6,500TEU container and 160K tanker. The Effect of propeller rotation was applied to the moving grid scheme and body force in form of source term. The Interface module was developed for I/O data between FLUENT and propeller code. Self propulsion factors were computed using moving grid with application of the realizable k-e and body force method to compare realizable κ-ε with reynolds stress turbulent model. The wake on the propeller plane and the pressure field around an appendage are investigated also. The Computational results can be expected to ship resistance and self propulsion characteristics.
홍석진,육지호,유웅열,Hong, Seok-In,Youk, Ji-Ho,Yu, Woong-Ryeol 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.2
A shape memory polyurethane (SMPU) with a transition temperature of $28^{\circ}C$ was synthesized to investigate its fiber formation characteristics. Based on the thermal analysis a melt spinning process was designed, from which mono- and multi-filaments of SMPU fibers were manufactured. The shape memory performance of both SMPU film and fibers was evaluated using a thermo-mechanical cyclic test. The results revealed that SMPU fibers show similar shape memory behavior to that of SMPU film. The effect of post treatments such as annealing, drawing and heat-set on the shape memory performance of SMPU fibers was investigated and their effects on the micro-structural change of SMPU fibers were analyzed using a molecular configuration model. It was demonstrated that the properties of SMPU fibers can be tailored using these post treatments, thereby shape memory woven fabrics can be developed using SMPU fibers.
홍석진 부산유아교육학회 2003 유아교육논총 Vol.11 No.-
본 연구는 동화와 관련한 최근의 학위논문의 연구 동향을 알아보기 위한 것이었다. 국회도서관 DB에서 나타난 1997년부터 2001년도까지의 논문 457편의 목록에서 404편(88.4%0을 분석기준에 근거하여 분석하였다. 분석결과 나타난 주요한 결과는 다음과 같다. 첫째, 동화와 관련한 논문이 꾸준히 증가하고 있고, 1999년 이후 100편이상의 논문이 나오고 있으며 기초연구보다는 응용연구가, 비실증연구보다는 실증연구를 더 많이 하였다. 둘째, 연구방법은 실험연구와 문헌연구를 많았고 1999년부터 실험연구가 50%이상이 되었다. 넷째, 조사연구와 실험연구를 제외하면 예비조사를 실시하지 않은 연구가 많았다. 넷째, 자료수집방법은 검법과 내용분석법을 많이 사용하였고 도구는 자작도구와 외국번안도구를 많이 사용하였다. 특히, 문헌연구는 내용분석법과 자작도구를 많이 이용하였다. 다섯째, 유아와 초등학생을 대상으로 한 동화를 이용한 교육적 효과에 관한 연구는 언어 발달, 사회성 발달, 정서 발달과 관련되는 것이 주류를 이루었다. 마지막으로 동화와 관련한 연구는 일반대학원보다는 특수대학원의 석사논문이 많았다. The purpose of this study is to analyze the studying trends for the master and doctoral dissertations related with fairy tales. The subjects of this study were 404 pieces out of 457 pieces from 1997 to 2001 years. These researches are kept in the Library of Congress database The major finding of this study were as followings. First, the number of dissertations about fairy tale have been continuously increased. Especially the number of these researches which have been studied during one year since 1999 is more than 100. Applied researches than basic researches and statistical methods than unstatistical methods are more studying Second, the methods of the researches is like that experimental and survey researches are numberous and the number of experimental researches which have been studied during one year since 1999 is more half than the total number which have studied during one year since 1999. Third, These researches which gave been not conducted prior study are numberous except of survey and experimental researches. In the data accumulation method, test method and content analysis method appeared in order. Use of the study tool appeared a result that frequently used one’s own method and translate method. Fourth, These researches which are chosen young children and elementary schooler as subject of research mainly studied about language development, social development, or emotional development. Finally, These researches were more master dissertations of unregular graduate school than master dissertations of regular graduate school.