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申澈洙,金鍾喆,姜宇政,李先基 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-
In order to understand the influence of the inducer inlet angle on cavitation and suction performance, experiments were carried out for two kinds inducer, which have the same outlet angle distribution, length and number of inducer blades. The results showed that the change of inducer inlet angles influenced not only internal flow conditions but also cavity flow and suction performance. The improvement of suction performance by using inducer were also discussed.
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.
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.
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.
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.
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.
신철수 한국교통대학교 2015 한국교통대학교 논문집 Vol.50 No.-
The three dimensional steady flows of blood and blood analogue fluids in the abdominal aortic bifurcation are simulated using the finite volume method. The objective of this investigation is to understand the generation and progression of specific atherosclerosis from a hydrodynamic point of view. Due to complexity of blood in conducting experimental study, aqueous polymer solution are used as the substitutional fluids. For comparison purpose of the flow characteristic of blood and substitutional fluids, rheology different fluids such as water soluble polymers of Carbopol-934 and Separan AP-273 are employed for the numerical simulation. In order to understand the role of hydrodynamic in the formation and development of atherosclerosis lesions flow velocities, pressures and shere stresses along the vessel are calculated for steady flows
友禪染의 技術導入 活用方案 : 日本 加賀友禪染을 中心으로
劉喆淵 상명대학교 논문집 1982 상명대학교논문집 Vol.10 No.-
Yuzen dye is a sort of dyeing art and craft which uses crimson, vieolet, green, cobalt blue, and yellowish brown as its favorite colors to produce the shapes of beautiful printed designs. Also it is a kind of traditional industrial art which is characterized by its delicate, graceful and gorgeous beauty. Kaga Yuzen dye has been encouraged to retain its tradition in the field of cultural policies, developed and utilized in various ways. The purpose of this study is to make use of Yuzen dye in the daily practical life. Its main contents are as follows; Ⅰ. Preface Ⅱ. The Main Articles 1. Background of Yuzen Dye 1) Birth of Yuzen Dye 2) Characteristics of Yuzen Dye 2. Manufacturing craft and process of Yuzen Dye 1) Material and Instrument used in the Dyeing 2) Manufacturing process 3. Applying method of Yuzen Dye to Korean traditional printing designs 1) Expressional thought of Yuzen Dye 2) Applying method to Korean raditional folk printing designs and Sip-Jang-Saeng Ⅲ. Conclusion The improvement and prospect of Korea Industrial dyeing arts. I have visited Japan several times to study the technical utilization of the method of Yuzen dye of Japan for Korean dyeing art. The main purpose of this study is to introduce their special dyeing art to our unique dyeing art. I dare say this little study will contribute to our Korean industrial dyeing art if we solve a few problems. The improving problems are; 1. The specialization of craftsmanship in the industrial dyeing art 2. The training of the craftsman of dyeing 3. The manufacturing of the instruments in the home industry of dye 4. The quality of water in dyeing 5. The utilizing method of the printing designs