단일 단계 접착제의 변연 미세누출

조영곤,정진호,기영재,최희영,진철희,유상훈,김종욱,박병철 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.2

This study evaluated the marginal microleakage of five single step adhesives. Class V cavity preparations with occlusal margins in enamel and gingival margins in dentin were prepared on both buccal and lingual surfaces of extracted human molar teeth. Prepared teeth were randomly divided into five groups and restored using one of the single step adhesives and composite resins: Prompt L-Pop/Filtek Z-250 (Group 1), AQ Bond/Metafil CX (Group 2), One-Up Bond F/Palfique Toughwell (Group 3), Futurabond/Admira (Group 4), Xeno III/Spectrum TPH (Group 5). The restored teeth were thermocycled. Microleakage was assessed by dye penetration using 2% methylene blue dye solution. The teeth were bisected buccolingually and evaluated for microleakage under steromicroscope. The data were statistically analysed by Kruskal-Wallis test and Mann-Whitney tests. The results of this study were as follows; 1. Microleakage of enamel margins in group 3 was statistically higher than that in groups 1, 2, 4, 5 (p < 0.05) 2. Microleakage of dentin margins in group 1 was statistically higher than that in groups 2, 5, and that in group 3 was statistically higher than that in groups 2, 4, 5 (p < 0.05). 3. Dentin marginal microleakage was higher than enamel marginal microleakage in all experimental groups. In conclusion, Prompt L-Pop showed the least leakage at enamel margin, and AQ Bond showed at dentin margin in this study. Marginal miroleakage in dentin was higher than that in enamel.

자가 산부식 프라이머의 적용시간이 상아질의 미세인장 결합강도에 미치는 영향

조영곤,이영곤,김종욱,박병철,김종진,최희영,진철희,유상훈 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.5

This study evaluated the influence of application time of self-etching primers on microtensile bond strength (μTBS) to dentin using three self-etching primer adhesive systems. Dentin surfaces were exposed from forty-eight human molars. They were conditioned with three self-etching primers (Clearfil SE Bond [SE], Unifil Bond [UF], Tyrian SPE + One Step Plus [TY]) and different primining times (10s, 20s, 30s and 40s). Composite resins were bonded to dentin surfaces and specimens were made. μTBS was tested and statistically compared using by one-way ANOVA and Tukey's Test. The results of this study presented that priming time for 10s in SE and UF groups and for 30s and 40s in TY group was highly decreased μTBS to dentin.

상아질에 적용된 재 습윤제가 미세인장 결합강도에 미치는 영향

강희영,조영곤,김종욱,박병철,유상훈,진철희,최희영,기영재 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.2

This study investigated that the effect of rewetting agent on dentinal microtensile bond strength (μTBS). Human molars were sectioned to expose the superficial dentin surfaces. Samples were divided into two groups according to type of adhesives-Single Bond (S) and One-Step (0)], and again subdivided into five groups by different dentin surface treatment-dry for 15s (D) , blot dry (BD) or dry for 15s, and rewet with different rewetting agents[distil1ed water (DW), Gluma Desensitizer (GD) and Aqua-Prep (AP)]for 30s. After application of adhesive, composite resin was built up on the bonding surface. Each tooth was sectioned to obtain stick with 1mm^(2) cross sectional area and the μTBS was determined by EZ test. In the S group, the mean μTBS of GD, AP and BD group was significantly higher than that of DW and D group (p < 0.05). In the 0 group, the mean μTBS of AP, GD, BD and DW group was significantly higher than that of D group (p < 0.05). The data suggested that Gluma Desensitizer and Aqua-Prep could be successfully used as rewetting agents, and Distilled water could be acceptable in aceton based adhesive system only.

법랑질 접착에 대한 습윤 효과

고근호,조영곤,진철희,유상훈,김종욱,박병철,기영재,최희영,김종진 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

This study evaluated the microleakage and interfacial gap between enamel and composite resin under the dry and wet condition of the enamel surface, V shaped class 5 cavities were prepared on the occlusal portion of extracted human molars. Samples were divided into three groups: D group (air dry for 10-15s), BD group (blot dry with moist cotton pellet), and DR group (air dry for 10-15s and rewet with Aqua-Prep F for 20s). Cavities were filled using Aelitefil composite resin after applied One-Step. Microleakage was tested by 2% methylene blue dye solution and the data were statistically analysed by Kruskal-Wallis test and Mann-Whitney test. Also Enamel-resin interface was observed under SEM. Group BD showed statistically lower microleakage than group D (p〈0.05). but there was no statistically significant difference between group BD and DR (p)0.05). At the enamel-resin interface, group D showed the gap of 2 ㎛ thickness, but group BD and DR showed close adaptation. In conclusion, the use of blot dry and rewetting agent (Aqua-Prep F) resulted in decreased microleakage and improved adhesion between enamel and resin when using One-Step.

복합레진의 지연충전이 미세인장 결합강도에 미치는 영향

박현식,조영곤,박병철,김종욱,최희영,김종진,진철희,유상훈,기영재 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

The purpose of this study was to evaluate the effect of immediate or delayed composite resin filling on dentinal microtensile bond strength (μTBS) after applied the adhesive. The coronal dentin of human third molars was exposed. Single-Bond or One-Step was applied on the dentin surfaces, and composite resin were constructed immediately (group 1) or 5 min., 10 min., 15 min., 20 min. and 30 min. (groups 2-6) after an adhesive was applied. The specimens were sectioned and made bar-shaped. Each surface area of them was about l ㎟. The RBS test was performed by EZ test. The results were analysed by One-way ANOVA and Tukey's test at 95 % significance level. The results suggested that the μTBS of Single-Bond to dentin was decreased when the composite resin was constructed 20 min. and 30 min. after Single-Bond was applied. But the μTBS of One-Step was not affected by delayed composite resin filling.

동해안 연안어항 해수중의 COD 및 중금속 함량에 관한 연구

김영철,주충열,신응배 漢陽大學校 環境工學硏究所 1999 環境科學論文集 Vol.20 No.-

동해 연안 일부어항의 해수에 대한 수질환경 자료로 DO, ?? 총질소, 총인 그리고 납, 카드뮴, 크롬, 비소 및 수은 등의 중금속을 측정·조사하였다. 측정결과, DO 5.1∼6.2㎎/l, ?? 0.9∼2.7㎎/l, 납 trace∼0.054㎎/l, 카드뮴 trace∼0.004㎎/l, 비소 trace∼0.002㎎/l, 그리고 수은 trace로 나타났다. 이러한 결과로부터 오염의 정도를 판단하기는 어려우나 환경부가 정한 해역의 수질환경기준과 비교하여 볼 때 중금속으로 인한 오염문제는 크게 우려할 수준이 아니나 일부어항의 ?? 용존산소, 총질소, 총인의 농도로 판단할 때 Ⅱ등급 또는 Ⅲ등급 수질로 나타났다. 이들 지역이 선박이 정착하거나 출입하는 어항임을 감안할 때 비교적 양호한 결과인 것으로 분석된다. The seawater was sampled from the East Coast and the contents of DO, ?? total nitrogen, total phosphates, and heavy metals(Pb, Cd, As, Hg) in the water were measured and analyzed. DO 5.1∼6.2㎎/l, ??0.9∼2.7㎎/l, total nitrogen<0.131㎎/l, total phosphate <0.019㎎/l, Pb <0.0542㎎/l, Cd<0.0038㎎/l, As<0.0016㎎/l, and Hg(trace) were detected by the analytical techniquies such as UV-visible spectrometry and atomic absorption spectrometry. The results shows that heavy metal contamination of the East Coast is equivalent to the detection limits of the first grade seawater. But, the amount of DO, ?? total nitrogen, total phosphates shown above indicates that the seawater in the East Coast is of second or third quality. In conclusion, the samples cannot be justified as the first quality. Considering that the sampling sites were seaports, the seawater in the East Coast is not seriously contaminated.

Interleukin-5 저해 활성 chalcone 화합물의 유효 입체 구조

이기철,김민석,P. Thanigaimalai,Vinay K. Sharma,박경래,김영수,정상헌 충남대학교 약학대학 의약품개발연구소 2010 藥學論文集 Vol.25 No.-

Interleukin(IL)-5 appears to be one of the main proinflammatory mediators among the growing number of cytokines and chemokines that induce eosinophilic inflammation. Previously, our group synthesized a number of chalcone derivatives to determine their inhibitory activity against IL-5. However, the structure-activity relationship (SAR) of these chalcones was somewhat unclear, robably due to presence of three free rotatable bonds. To further, explore the SAR of these chalcones, we synthesized eight 2-(benzylidene)-2,3-dihydroinden-1-ones and 2- benzylidene)-3,4-dihydronaphthalen-1(2H)-ones 6 and evaluated for their inhibitory activity against IL-5. These rigidified chalcones 6 exhibited very weak inhibitory activity against IL-5 compared to chalcones 2. The structures of 6 closely resemble to the stretched conformations of chalcone 2, not effective conformation for the inhibition on IL-5 function.

粉末洗濟에 대한 生分解度와 重金屬에 대한 硏究

김영철,김종섭,유찬주,주충열 漢陽大學校 環境工學硏究所 1997 環境科學論文集 Vol.18 No.-

현재 국내에서 시판중인 의류용 세탁 분말세제 6종을 대상으로 미생물에 의해 분해될 수 있는 정도를 파악하기 위한 생분해도(Biodegradability)를 측정하고 동시에 인체에도 직접적인 영향을 미치는 중금속(Pb,Cd,As 및 Hg)를 분석하였다. 분석결과 전제품이 KS 기준에 모두 적합하였으나 석유계 계면활성제인 AOS 또는 LAS가 다량 포함 되어있는 제품에서는 상대적으로 생분해도가 낮다는 것을 알 수 있으며 중금속 함유량은 제품 6종 모두 화장품 원료기준에 훨씬 못미치는 우수한 제품인 것을 알 수 있었다. As the subject of study of six kinds of laundry powder detergents for clothing that come into the domestic market at present, the biodegradabilities to understand the extent of microorganisms decomposition were measured and the heavy metals(Pb, Cd, As and Hg) to have a direct effect on human body were analyzed. Analysis results show that though they all suit KS(Korean Industrial Standards) well, powder detergents containing plenty of petroleum surface active agents have the lower biodegradability than the others and Heavy metal contents are that all of them are very good at the cosmetic material standards.

寶城江댐 流域의 植生

金順熙,鄭泳喆,金琮鴻 순천대학교 기초과학연구소 1993 基礎科學硏究誌 Vol.4 No.-

The vegetation, which is based on vascular plants, in the vicinity of the Po^sung-gang dam was investigated phytosociologically over 13 times on 57 points from November, 1991 to July, 1993. Species composition, live form, and community structure of the flora, species diversity, and similarity index were determined, and the profile diagram of plant community and actual vegetation map were constructed. Vascular plant flora in the surveyed area was 34 orders, 92 families, 247 genera, 340 species, 1 subspecies, 44 varieties and 2 forma, in total 387 kinds. The composition of life form was classified into Ch-D_1-R_5-e type. Vegetation was classified into coniferous forest and deciduous broad-leaved forest. Coniferous forests were composed of the communities of Pinus densiflora and P. thunbergii as the natural forest, and P. rigida community, Chamaecyparis obtusa community and other 15 mixed forest communities as artificial forest. Deciduous broad-leaved forests were extensively composed of natural forest such as Quercus acutissima community and Q. aliena community, and artificial forest such as Alnus japonica community, C. crenata community and Robinia pseudo-acacia community, and other 6 mixed forest communities. The communities of Camellia japonica and Miscanthus sinensis var. purpurascens were observed on a small scale in the surveyed area. Species diversity index was 1.105, in coniferous forest and 1.118 in deciduous broad-leaved forest. Similarity index between the two communities was 0.555, which means those communities are remarkably different from each other in species composition. Pterophyta quantity(Pte-Q), which is 0.68, was lower than that of national average, 1.68, while urbanization index measured as 2.37 was higher than that of national average, 9.9. The vegetation of vascular plants in Po^sung-gang Dam was coincided with that of the southern area of the Korearn peninsula, in distribution types of family or genus. It was to be noted that a natural community of Scirpus radicans which is generally believed to be distributed in northern area was found in this surveyed area.

퍼지 제어기 소속함수의 추정을 위한 진화프로그래밍 이용에 관한 연구

김승철,장종승,강신출,임영도 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

On this paper, the design of fuzzy adaptive controller using an evolution programming combining fuzzy controller to be very effectove in the optimization problem will be proposed. On a proposing control structure, the optimization takes uncertain plants optimized membership function using EP, and we want to take an adaptive controller in the plant as well be adapted control structure to initiate approximate membership function in fuzzy. We show that proposed controller have a good performance than general fuzzy controller through a computer simulation and the real-time control of DC serve motor.