기구조작에 따른 순수 타이타늄 표면 변화와 치은 섬유아 세포 부착에 관한 연구

서성찬,송인택,임정수,김형섭,Seo, Sung-Chan,Song, In-Taeck,Lim, Jeong-Su,Kim, Hyung-Seop 대한치주과학회 1999 Journal of Periodontal & Implant Science Vol.29 No.3

This study examined the human fibroblasts cell attachment to commercially pure titanium surface which had been instrumented by 3 types of periodontal instruments. Commercially pure titanium plates were uniformly scaled using plastic, stainless steel, titanium curette. these all experimental groups 65 undirectional strokes with the designated curettes. Alteration of the surfaces due to instrumentation was evaluated by Form Talysurf(R) and reported as Ra value(mean surface roughness). Then other experimental groups were immersed in a cell suspension of human gingival fibroblasts($1{\times}10^5$ cell/ml). After 3 days of culture, cell attachment and morphology was observed by SEM, and attached cell were counted by Hemocytometer. A significant difference in mean Ra value was observed for surface instrumented by metal curette compared to either control surface or surface instrumented by the plastic curette(P<0.01). No stastically significant difference was noted between control surface and those instrumented by the plastic curette. SEM observation showed that cell morphology and attachment to the commercially pure titanium plate was similar appearance on the all experimental groups. Experimental groups instrumented by titanium curette and stainless steel curette were more attached cell number than control group, but experimental group instrumented by plastic curette were similar with control groups(P<0.01). In summary, metal curette produced an significant alteration of the commercially pure titanium surface and more favorable surface topography for cell attachment. Otherwise plastic curette was insignificantly altered the commercially pure titanium surface(P<0.01).

원저 : 개의 성대수술 후 발성음의 음성학적 분석

연성찬,서강문,권오경,남치주 (Seong Chan Yeon,Kang Moom Seo,Oh Kyeong and Tchi Chou Nam) 한국임상수의학회 1997 한국임상수의학회지 Vol.14 No.1

Poodle의 발성음

연성찬,서강문,권오경,남치주 한국임상수의학회 1996 한국임상수의학회지 Vol.13 No.2

This study was performed to analyse the common calls of poddle spectrographically : bark, growl, howl, snore, yelp and whine. The sonograms of 6 common calls were shown their own specific features. There were significant differences among each types of common callsin the parceter of minimun frequency of call (MIFC), maximun frequency of call (MAFC), duration of call (DC), interval between call (IBC), dominant frequency (DF), F1 formant, F2 formant and F3 formant (P<0.01). It was considered that it was possible to record the main common calls dogs by sonograms and it sould be applied to objective basic data for understanding the psychological stats of dogs, the social relationship among them and the relationship sith human being.

산업부산물을 혼화재로 사용한 콘크리트의 특성에 관한 실험적 연구

성찬용 ( Sung Chan Young ),조일호 ( Cho Il Ho ),서대석 ( Seo Dae Seuk ),민정기 ( Min Jeong Ki ) 한국농공학회 1999 韓國農工學會誌 : 전원과 자원 Vol.41 No.6

This study is performed to evaluate the properties of concrete using industrial wastes such as fly ash. zeolite powder and blast furnace slag powder. Seven types of concrete mixtures are made in this study. Water-reducing admixture and air entraining agent are used for all mixtures. Test results, the hydration evolution amounts are decreased by 2-31% than that of the normal portland cement and air contents of concrete are decreased by 1-1.5% and compressive strengths are increased by 2-10% at the curing age 28 days than that of the normal portland cement concrete. Accordingly, concrete using industrial wastes will greatly improve the properties of concrete.

패분 콘크리트의 비파괴 특성에 관한 실험적 연구

성찬용 ( Sung Chan Young ),서대석 ( Seo Dae Seuk ),민정기 ( Min Jeong Ki ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.2

This study is performed to evaluate experimentally the nondestructive properties on the concrete that is treated with crushed oyster shell powder of 0.15mm or smaller in diameter. The ultrasonic pulse velocity of crushed oyster shell concrete(COSC) is in the range of 4.110-4.267m/s, and the dynamic modulus of elasticity of COSC range from 288×10³ to 318×10³kgf/cm². The ultrasonic pulse velocity and dynamic modulus of elasticity are similar to those of normal portland cement concrete. The highest ultrasonic pulse velocity and dynamic modulus of COSC are measured at the 2.5% addition rate by weight of crushed oyster shell powder. The acid-resistance in increased of the content of crushed oyster shell powder. The acid-resistance of COSC with 15% addition rate by weight of crushed oyster shell power is 1.6 times greater than that of normal portland cement concrete. It is concluded that the addition of crushed oyster shell powder to normal portland cement concrete contributed to improve the nondestructive properties of concrete.

플라이 애쉬와 탄산칼슘을 混入한 透水性 폴리머 콘크리트의 工學的 性質

성찬용,한영규,윤준노,김경태,서대석,남기성 충남대학교 농업과학연구소 1998 농업과학연구 Vol.25 No.2

This study was performed to evaluate the engineering properties of permeable polymer concrete with Fly Ash and CaCo_3. The following conclusions were drawn; 1. The unit weight was in the range of 1,830∼1,932kgf/㎥, the unit weights of those concrete were decreased 16∼20% than that of the normal cement concrete. 2. The highest strength was achieved by fly ash 50% and CaCo_3 50% filled permeable polymer concrete, it was increased 26% by compressive strength, 121% by tensile strength and 275% by bending strength than that of the normal cement concrete, respectively. 3. The ultrasonic pulse velocity was in the range of 2,805∼2,904m/s, which was showed about the same compared to that of the normal cement concrete. Fly ash 50% and CaCo_3 50% filled permeable polymer concrete was showed higher pulse velocity.

고로 슬래그와 플라이 애시를 混人한 透水性 폴리머 콘크리트의 特性에 關한 實驗的 硏究

성찬용,김인수,조일호,윤준노,김영익,서대석 충남대학교 농업과학연구소 1999 농업과학연구 Vol.26 No.2

이 연구는 고로 슬래그 모래를 잔골재로 하여 고로 슬래그 미분말과 플라이 애시를 혼입한 투수성 폴리머 콘크리트의 특성을 구명한 것으로서, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 강도는 고로 슬래그 미분말과 플라이 애시를 중량비로 50%씩 충전재로 사용한 투수성 플리머 콘크리트에서 가장 크게 나타났고, 보통 시멘트 콘크리트보다 압축강도에서는 36%, 휨강도에서는 217%가 증가되었다. 2. 정탄성계수는 100×10³~130×10³kgf/㎠으로 보통 시멘트 콘크리트의 43~51%정도로서 변형성이 크게 나타났고, 충전재 배합별로는 고로슬래그 미분말과 플라이 애시를 중량비로 50%씩 사용한 투수성 플리머 콘크리트에서 가장 큰 값을 보였다. 3. 동탄성계수는 102×10³~130×10³kgf/㎠로서 보통 시멘트 콘크리트보다 작게 나타났고, 고로슬래그 미분말과 플라이 애시를 50%씩 충전재로 사용한 투수성 폴리머 콘크리트에서 가장 큰 값을 보였으며, 동탄성계수보다 약 0~4%정도 큰 값을 보였다. 4. 투수량은 4.612~5.913ℓ/㎠/h로서 배합설계에 따라 크게 좌우되었으며, 이러한 콘크리트는 투수를 요하는 구조물에 유용하게 이용할 수 있을 것이다. This study is peformed to evaluate the properties of permeable polymer concrete with blast furnace slag and fly ash. The following conclusions are drawn. 1. The highest strength is achieved by 50% filled blast furnace slag powder and fly ash permeable polymer concrete, it is increased 36% by compressive strength and 217% by bending strength than that of the normal cement concrete, respectively. 2. The static modulus of elasticity is in the range of 100×10^(3)∼130×10^(3)㎏f/㎠, which is approximately 43∼51% of that of the normal cement concrete. 3. The dynamic modulus of elasticity is in the range of 102×10^(3)∼130×10^(3)㎏f/㎠, which is approximately less compared to that of the normal cement concrete. The highest dynamic modulus is showed by 50% filled blast furnace slag powder and fly ash permeable polymer concrete. The dynamic modulus of elasticity are increased approximately 0∼4% than that of the static modulus. 4. The water permeability is in the range of 4.612∼5.913 l/㎠/h, and it is largely dependent upon the mix design.

볏짚재를 混入한 콘크리트의 工學的 性質

성찬용,이희만,김영익,김경태,서대석,남기성 충남대학교 농업과학연구소 1998 농업과학연구 Vol.25 No.2

This study was performed to evaluate the engineering properties of concrete using normal portland cement, natural aggregates and rice-straw ash. The following conclusions were drawn; 1. The unit weight was in the range of 2,250∼2,335kgf/㎥, the weights of those concrete were decreased 1∼5% than that of the normal cement concrete, respectively. 2. The highest strength was achieved by 5% rice-straw ash filled rice-straw ash concrete, it was increased 17% by compressive strength, 30% by tensile strength and 21% by bending strength than that of the normal cement concrete, respectively. 3. The ultrasonic pulse velocity was in the range of 4,059~4,360m/s, which was showed about the same compared to that of the normal cement concrete. The highest ultrasonic pulse velocity was showed by 5% rice-straw ash filled rice-straw ash concrete. 4. The acid-proof was increased with increase of the content of rice-straw ash. The acid-proof was increased 1.15 times by 5% rice straw ash, 1.45 times by 10%, 1.6 times by 15% rice-straw ash filled concrete than that of the normal cement concrete, respectively.

한국 진도견의 안과질환에 관한 연구

서강문,장광호,정종태,연성찬,이계웅,남치주 한국임상수의학회 2001 한국임상수의학회지 Vol.18 No.3

This study presented the results of ophthalmic examinations performed on 545 Korean Jindo dogs. The most prevalent ocular variation within normal limits was hyoid vessel remnant (12.7%) and prominence of lens suture was also noticed (1.7%). The most common ocular diseases were retinal scars (6.8%), focal cataract (4.6%) and persistent pupillary membrane (4.2%). Inherited ocular diseases found in this study were persistent pupillary membrane (4.2%), persistent hyperplastic primary vitreous (0.6%), retinal dysplasia (0.6%), entropion (0.4%) and progressive retinal atrophy (0.4%). The prevalence of ocular diseases was higher in Male than in Female and proportionately higher in the older dogs. The most prevalence was shown in white coat color dogs. The fundus color changes according to the age was not related in coat colors and shown same pattern.

고화재를 사용한 Soil-Concrete의 강도 및 투수특성

서대석 ( Seo Dae Seuk ),김영익 ( Kim Young Ik ),정현정 ( Jung Hyun Jung ),남기성 ( Nam Ki Sung ),이전성 ( Lee Jeon Sung ),성찬용 ( Sung Chan Yong ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-

This study is performed to evaluate the strength and permeable properties of soil-concrete. The results show that the highest compressive strength and bending strength of soil-concrete is achieved by 20% gravel, 20% excellent soil compound and 0.1% polypropylene fiber filled soil concrete. The coefficient of permeability is decreased with increase of the content of gravel and excellent soil compound, and increased with increase of the content of polypropylene fiber. Accordingly, soil concrete with polypropylene fiber will be improve the physical and mechanical properties of concrete.