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한국인 전반적 급진성 치주염 환자에서 IL-6 유전자 다변성에 관한 연구
방선정,김일신,김옥수,김영준,정현주,Bang, Sun-Jung,Kim, Il-Shin,Kim, Ok-Su,Kim, Young-Jun,Chung, Hyun-Ju 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.4
Purpose: The purpose of this study was to investigate the association of generalized aggressive periodontitis with IL-6 promoter gene single nucleotide polymorphisms(SNP). Material and Methods: The study population consisted of 52 generalized aggressive periodontitis patients(GAP) and 30 periodontally healthy control subjects, who were systemically healthy non-smokers. Genomic DNA was obtained from buccal swab. The IL-6 promotor SNP at the positions of -597, -572, and -174 were genotyped by amplifying the polymorphic region using polymerase chain reaction(PCR), restriction enzyme digestion and gel electrophoresis. Result: The genotype distributions for G/G, G/A and A/A genotypes of IL-6 -597 were 30.8%, 40.4%, and 28.8% in the GAP group and 53.3%, 40%, and 6.7% in the control group and were statistically different between 2 groups(p<0.05). Allele 2 frequency of IL-6 -597 were significantly higher in the GAP group than the control group(p<0.01). At the position of IL-6 -572, the distribution for C/C, C/G and G/G genotypes were 23.1%, 55.8% and 21.2% in the GAP group and 20%, 33.3%, and 46.7% in the control group. In female subjects, the genotype distribution were significantly different between 2 groups(p<0.01). In male subjects, allele 2 frequency of IL-6-572 was significantly lower in the GAP group than the control group(p<0.05). The genotype distribution of IL-6 -174 in the GAP group were 96.2%, 3.8% for G/G, G/C genotypes whereas only the G/G genotype was detected in the control group. Conclusion: In conclusion, significant associations were found in IL-6 gene promoter(-597, -572) polymorphisms and generalized aggressive periodontitis. Further cohort study will be necessary in larger population.
The Improvement of Clone Embryo Production Applied with Aggregation Method in Bovine
Jae-Il Bang,Kyeong-Lim Lee,Jong-In Jin,Md. Fakruzzaman,Byeong-Hyun Choi,A-Na Ha,Seong-Su Kim,Er-Dan Wang,Nasser Ghanem,Il-Keun Kong 한국동물생명공학회(구 한국동물번식학회) 2013 Reproductive & Developmental Biology(Supplement) Vol.37 No.2s
The Improvement of Clone Embryo Production Applied with Aggregation Method in Bovine
Jae-Il Bang,Kyeong-Lim Lee,Jong-In Jin,Nasser Ghanem,Md. Fakruzzaman,Byeong-Hyun Choi,A-Na Ha,Seong-Su Kim,Er-Dan Wang,Il-Keun Kong 한국동물생명공학회(구 한국동물번식학회) 2013 Reproductive & Developmental Biology(Supplement) Vol.37 No.2s
Ovum Pick-Up derived Embryo Production and Its Application
Il-Keun Kong,Jong-In Jin,NasserGhanem,Byung-Hyun Choi,Hyun-Tae Jo,Seong-Su Kim,Jae-Il Bang,A-Na Ha,Md Fakruzzaman,Han-Seul Park,Yu-Gon Kim,Pu-Rum Park,Suk-Hwan Song,Kyu-Woan Cho,Jung-Gyu Lee 한국동물생명공학회(구 한국동물번식학회) 2013 발생공학 국제심포지엄 및 학술대회 Vol.2013 No.1
Su-Tae Kang,Kang-Seok Lee,Jeong-Il Choi,Yun Lee,Burak Feleko?lu,Bang Yeon Lee 한국콘크리트학회 2016 International Journal of Concrete Structures and M Vol.10 No.3
Ultra-high performance concrete (UHPC) is one of the most promising construction materials because it exhibits high performance, such as through high strength, high durability, and proper rheological properties. However, it has low tensile ductility compared with other normal strength grade high ductile fiber-reinforced cementitious composites. This paper presents an experimental study on the tensile behavior, including tensile ductility and crack patterns, of UHPC reinforced by hybrid steel and polyethylene fibers and incorporating plastic beads which have a very weak bond with a cementitious matrix. These beads behave as an artificial flaw under tensile loading. A series of experiments including density, compressive strength, and uniaxial tension tests were performed. Test results showed that the tensile behavior including tensile strain capacity and cracking pattern of UHPC investigated in this study can be controlled by fiber hybridization and artificial flaws.
Reduction Characteristics of Welding Deformation According to Cooling Distance in Heat Sink Welding
Bum-Su Go,Kyung-Hwan Oh,Soon-Il Kwon,Hee-Seon Bang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.11
When assembling a welding structure, welding deformation occurs inevitably due to the locally applied heat source. This not only decreases the strength of the structure but also decreases productivity efficiency. In recent years, in-process control welding by an additional cooling source has been applied for thin-plate structures. In the present study, a numerical analysis of Heat Sink Welding (HSW) was performed to examine the effect of the heat sink source on the degree of welding deformation. Then the numerical result was compared with that of conventional welding. Moreover, the result predicted from the numerical analysis was compared with the experimental result on displacement to be validated. As a result, a cooling zone appeared on the welding metal surface. In the case of the heat-affected zone (HAZ), it was confirmed that the maximum temperature decreased from 596 to 545 K compared to the conventional welding method. In addition, the displacement in the thickness direction decreased by about 5%, from 0.83 to 0.79 mm. The overall results obtained in numerical analysis indicated that the cooling efficiency significantly increases as the cooling distance is shorter.