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성견에서 즉시 임플란트 식립시 국내 임플란트에서의 골 유착반응에 관한 연구
서정윤,이욱재,이종철,신미란,김윤상,피성희,신형식,유형근,Seo, Jung-Yoon,Lee, Wook-Jae,Lee, Jong-cheol,Shin, Mee-Ran,Kim, Yun-Sang,Pi, Sung-Hee,Shin, Hyung-Shik,You, Hyung-Keun 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.2
This study was attempted to evaluate home-manufactured implants by placing $Stage-1^{(R)}$ Implant (Lifecore, Co., USA) whose surface is treated with REM that has already been varified clinically,$Chaorum^{(R)}$ Implant(Chaorum Co., Korea) whose surface treatment is same as that of Stage-1 Implant and $Atlas^{(R)}$ Implant(Cewellmedi Co., Korea) whose surface is treated with anodic oxidation immediately after the teeth of experimental animals were extracted to compare histological findings among them. Stage-l Implant(diameter: 3.5mm, length: IOmm), Chaorum Implant(diameter: 3.3mm, length: 8.5mm) and Cowell medi Implant(diameter: 4.0mm, length: 8.0mm) were placed into the mandible premolars of 2 adult beagle dogs immediately after their teeth were extracted, and then histological findings were analyzed at 6 weeks. After those implants were inserted directly after their teeth were extracted, the results of periotest were recorded, radiography was done, the subjects went through thorough control for 6 weeks, and then comparison among periotest, radiography and histological finding was made. After comparison of those findings, the values of periotest were satisfactory and bone healing was relatively satisfactory on radiography at 6 weeks. For osseointegration with the bone tissue, Stage-1 was 45.3%, Chaorum 55.3%, and Cowellmedi 52.5%, which was a satisfactory result. Although implant surgery immediately after teeth were extracted involves difficulties among recent implant surgeries, it is being frequently used in that it may reduce surgery hours, the frequency of surgery, and bone loss for patients. This experiment was conducted to evaluate the technological levels of home-manufactured implants that have been remarkably developed in recent years and in conclusion, those implants showed nearly similar result.
문병현,이택순,서정윤,서희정 ( Byung Hyun Moon,Taek Soon Lee,Jeoung Yoon Seo,Hee Jung Seo ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
This study was conducted to use waste oyster shell as biofilm media for biological wastewater treatment. The comparison between the activated sludge and the submerged biofilm process with oyster shell media (5% of reactor volume) for domestic sewage treatment was made at various hydraulic retention times. The effluent quality of the submerged oyster shell reactor was more stable than that of activated sludge reactor. The BOD removal efficiencies of the submerged process was above 80% at the various organic loading rates of 0.12∼0.55㎏BOD/㎥/day. The COD and SS removal efficiencies of the submerged process were higher than that of the activated sludge process. Also, TKN and T-P removal efficiencies of submerged process were higher than that of the activated sludge process. The comparison between the submerged biofilm process with oyster shell media of 10% and 18% was made at various loading rates. The hydraulic retention time was fixed to 6hr. The BOD, COD_(Cr) removal efficiencies of 10% and 18% were above 80% at organic loading rates of 1.0㎏ BOD/㎥/day and 1.5㎏COD_(Cr)/㎥/day but the removal efficiencies of 18% reactor decreased as the organic loading rates were increased. The TKN removal efficiencies of 10% and 18% were above 70% at organic loading rates of 0.2㎏ TKN/㎥/day. However, the removal efficiencies of 18% reactor decreased at the higher loading rates. The phosphorus removal efficiencies of both reactors showed similar removal efficiencies.
Pseudomonas sp. BCNU 154 유래의 유기용매 내성 리파아제
최혜정(Hye Jung Choi),황민정(Min Jung Hwang),서정윤(Jeoung-Yoon Seo),주우홍(Woo Hong Joo) 한국생명과학회 2013 생명과학회지 Vol.23 No.10
산업공단지역의 폐수에서 분리한 유기용매 내성 Pseudomonas sp. BCNU 154 리파아제의 최적조건은 37℃, pH 8로 조사되었다. BCNU 154의 crude 리파아제는 toluene에서 2시간 반응시 효소활성 약 6.01 U/ml (117.53%)로 가장 안정한 것으로 나타났다. 한편 Ca2+, Mg2+, NH₄+, Na+ 이온 및 triton X-100은 효소를 활성화시킨 반면에 Ba2+, Hg2+ 및 Zn2+ 이온은 효소활성을 억제하였다. Pseudomonas sp. BCNU 154 리파아제는 상용 고정화 효소인 Novozym 435와 비교해서도 안정한 활성을 보였다. 그러므로 유기용매 내성 리파아제는 별도의 고정화 처리없이도 화학산업공정에서 가능성 있는 whole cell 생물촉매로서 유용할 것으로 판단된다. An organic solvent-tolerant lipase of Pseudomonas sp. BCNU 154 that was isolated from wastewater in the industrial complex region had optimal activity at 37°C and pH 8. This crude extracellular lipase from BCNU 154 exhibited maximum stability in toluene, retaining about 6.01 U/ml (117.53%) activity for 2 h. Ca2+, Mg2+, NH₄+, and Na+ ions and triton X-100 activated the enzymes, whereas Ba2+, Hg2+, and Zn2+ ions inhibited their activity. Pseudomonas sp. BCNU 154 lipase revealed stable activity comparable to that of the commercial immobilized Novozym 435. Thus, this organic solvent-tolerant lipase could have potential as a whole cell biocatalyst in industrial chemical processes without the use of immobilization.
한국 영아로부터 분리한 Enterococcus faecium의 구강 병원균에 대한 억제 효과
정은경,이종철,서정윤,김성윤,김완수,윤우혁,김윤상,피성희,유형근,신형식,Jeong, Eun-Gyeong,Lee, Jong-Cheol,Seo, Jung-Yoon,Kim, Seong-Yoon,Kim, Wan-Su,Yun, Woo-Hyuk,Kim, Yun-Sang,Pi, Sung-Hee,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.1
Purpose: The probiotic effects of lactic acid bacteria have widely been researched in diverse human pathogens, but only a few effects are reported against oral pathogens. The antimicrobial effects of the Enterococcus faecium 7413 isolated from Korean infants on the 9 pathogen including 6 oral streptococci were investigated the clinical use of the antimicrobial peptide for oral microflora control. Materials and Methods: E. faecium 7413 was identified by morphological, biochemical tests and 16S rDNA sequence analysis. Inhibitory effects of culture supernatants were determined for their ability to grow on agar plate containing pathogenic bacteria. Result: The culture supernatant of Enterococcus faecium 7413 showed inhibitory effects on oral pathogens, namely Streptococcus pyogenes KCTC 3556, S. pneumoniae KCTC 5080, S. mutans ATCC 25175, S. anginosus ATCC 33397, S. constellatus KCTC 3268, S. intermedius ATCC 27823 and Shigella flexneri KCTC 2008. Whereas it did not affect the multiplication of E. coli strains, KCTC 1041 and ATCC 43894. Conclusion: The data obtained in this study could be useful for future development of effective probiotics allowing prevention for oral pathogens.
전산유체역학을 이용한 용접흄농도 간접적 예측가능성 연구
박승욱,김태형,서정윤,허영빈,임정호,강대웅,하현철,Piao, Cheng Xu,Kim, Tae Hyeung,Seo, Jeoung Yoon,He, Rong Bin,Lim, Jung Ho,Kang, Dae Woong,Ha, Hyun Chul 한국산업보건학회 2009 한국산업보건학회지 Vol.19 No.4
There are various methods for welding fume control. These methods can be divided into local exhaust system, general ventilation system and integrated control system. With the general ventilation system, we should have a good prediction tool for testing various appropriate control options. But, until now there are not many studies about how to predict the welding fume concentrations. Especially, the prediction of welding fume concentration is not a very easy task because welding fume is the particulate matters. In this study, we tried to measure $CO_2$ concentrations and welding fume concentrations in a small single room with a small ventilation opening. Using commercially available CFD (Computational Fluid Dynamics) software, we tried to predict $CO_2$ concentrations under the exactly same conditions. Then, we tried to compare the numerical $CO_2concentrations$ with the experimental results to know whether we could predict $CO_2$ concentrations. Then we tried to compare $CO_2$ concentrations with experimental welding fume concentrations to know whether we can use the numerical $CO_2concentrations$ to predict the welding fume concentration indirectly.