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김영묵,이상용,김만구,신승철,Kim, Young Muk,Lee, Sang Yong,Kim, Man Goo,Shin, Seung Cheol 대한토목학회 1993 대한토목학회논문집 Vol.13 No.5
본 고는 폐기물 매립지반의 지반개량을 위하여 1992년 3월 16일부터 1992년 10월 25일까지 수행된 동다짐공사 결과에 대한 연구사례이며, 개량대상지역은 대전시 갑천변에 위치하는 폐기물 매립부지로 1983년부터 1989년까지 주로 도시생활 쓰레기, 연탄재, 구조물 해체 잔해물 및 일부 산업폐기물로 매립되어 형성된 지역이다. 동다짐 공사는 2개 지점에서 시험동다짐을 시행하여 그 결과를 기준으로 수행되었으며, 개량효과 분석 및 품질관리를 위하여 각종 현장확인 시험 및 지반거동 계측을 수행하였다. 또한 동다짐시 인접된 구조물에 미치는 영향을 분석하기 위하여 진동측정을 시행하였다. 제반 현장시험 및 계측자료 분석결과 전체적으로 지반의 강도증가 및 압축효과가 양호한 것으로 확인되어 본 지역의 폐기물 매립지반에 대한 동다짐공법 적용은 효과적인 것으로 나타났으며, 향후 본 지역과 유사한 폐기물 매립지반에 대한 동다짐공법 적용시 참고가 될 수 있을 것으로 기대된다. This article is a case study of the ground improvement project which was carried out for manmade landfill. The project area is located near to Kapchun, Teajon and composed of the municipal wastes dumped, demolished building debris, coal ash and industrial waste made between 1983 and 1989. The DDC(dynamic deep compaction) based on the results of the test compaction at two representative locations was carried out from March 16, 1992 to Oct. 25, 1992. Field measurements and laboratory tests were carried out for ground improvement assessment and quality control for the DDC(dynamic deep compaction) work. From the results of field measurements and laboratory tests, it was found that the DDC work was successful: waste landfill was compressed considerably (${\fallingdotseq}$ 15% of full depth); and the strength was increased satisfactorily (${\fallingdotseq}$ 100% of original penetration resistance), Also, it is expected that the results of this work could be a guide to the future DDC work with the similar ground conditions, i.e. man-made landfills.
20대 치과환자의 현존 우식상태와 치아우식활성도와의 상관관계에 관한 임상적 연구
金龍成,申承澈,李銀淑 단국대학교 치의학연구소 1992 논문집 Vol.4 No.-
The author had examined the caries status on 62 female dental patients of age 20's and performed the modified Snyder tests by use of Cariostat, in order to compare the correlation between the present caries status and the results of Cariostat test. The data from each patients were calculated to obtain the correlation coefficiency between two factors. The obtained results were as followings. 1. There were no evidence of correlation between the present caries or filled status and the results of caries activity tests by use of Cariostat in dental patients of age 20's with ordinary oral status. 2. It was recommended that modified Snyder tests by use of Cariostat would be effective to for children with rampant caries of dental patients with dental appliance to estimate the caries activity in clinical.
Apatite-Wollastonite Glass-Ceramics 材料開發 및 치면열구전색재로의 이용을 위한 동물실험 연구
金龍成,申承澈,金豪健,申建澈,小久保正 단국대학교 치의학연구소 1991 논문집 Vol.3 No.-
The authors has experimented with Apatite - Wollastonite - Glass -Ceramic of MgO-CaO-SiO_2-P_2O_5-CaF_2 as biomaterials in order to find out the possibility for use of pit & fissure sealants. 2-rabbits would be selected with insertion of AWGC powder at lower anterior teeth after flap operation. X-ray taking has been done after 2 weeks and 4 weeks breedings. Extracted tooth had been used as samples for SEM observation after sacrificing every 2 weeks. Every samples had been observed at material portion as well as tooth. Such components as Si, Ca and P had been checked by use of EDX and compared the periodic changing data. The obtained results are as follows; 1. Apatite - Wollastonite glass ceramics were prepared with the component of MgO-CaO-SiO_2-P_2O_5-CaF_2 successfully. 2. On intraoral X-ray findings for teeth, A-W materials had been shown the slightly absorption at 2 weeks breeding sample and A-W material had been remove out by attrition otherwise it had been shown the generally radiolucent area as decalcification at 4 weeks breeding sample. 3. On SEM finding for tooth sample after insertion of A-W, the band like intermadiate zone had been found more remarkably at 2nd and 4th week breeding samples, rather than that of the sample which prepared at right after insertion. And this band zone had been fingured diffuse image by gradual. 4. Si and P might be drawn out from A-W material by disolution of A-W through the time, and it was estimated that calcium phosphate as apatite crystal, newly formed biomaterial, would be made of P component from A-W and Ca component from Tooth. 5. It was estimated that A-W material would be more useful at bone than at teeth and adaptable cement should be needed between tooth surface and A-W in case of using for pit & fissure sealant. So more studies for developing the adaptable cement would be needed.