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논문집 초록 : 학술발표일정 ; 3. 포스터발표 : 유기염소계 농약 Endosulfan의 생물학적 분해
서유덕,조정우 한국환경관리학회 2003 하계학술연구발표회 Vol.2003 No.-
본 연구는 P. chrysosporium으로 유기염소계 농약인 Endosulfan의 생물학적 분해에 관한 연구를 수행하였다. P. chrysosporium 균주의 영양원별 성장특성 실험에서 질소원중 평균 건조균사체량이 0.6∼0.7g/L로 모두 비슷하게 나타났으며, 그중 urea를 첨가하였을 때 조금 높은 성장을 보였다. 탄소원별 성장특성 실험에서 saccharose와 sorbitol이 평균 건조균사체량이 0.24g/L와 0.25g/L로 높은 성장을 보였다. GC 및 GC/MS 분석에서 a-Endosulfan은 retention time 22.93분에서 β-Endosulfan은 24.10분에서 각각 나타났다. a-Endosulfan, β-Endosulfan의 분해율은 28.8% 및 22.3%로 a-Endosulfan의 분해율이 6.5% 높게 나타났다. 배양시간 0h 및 80h에서 Endosulfan의 EI spectrum은 거의 동일하게 나타났다. White-rot basidiomycetous fungi are primarily responsible for the degradation of lignin in wood. Recently, it has been shown that Phaenerochaete chrysosporium belonging to the white-rot basidiomycete can metabolize many other aromatic compounds such as anthracene, phenanthrene, dibenzo-p-dioxin, and so on. In this work, We have examined the possibility of biodegradation for an organochlorine pesticide, endosulfan, by using P. chrysosporium. As an initial step, medium composition and culture conditions were optimized. The optimum pH was near 7.0. It was found that (NH_1)_2SO_4 was best nitrogen source for the cell growth of P. chrysosporium. Meanwhile, both saccharose and sorbitol exhibited better cell growth than other carbon sources. Upon GC/MS analysis, the retention times of a-Endosulfan and β-Endosulfan were found as 22.93min, 24.10min, respectively. Biodegradation experiments demonstrated that P. chrysosporium can degrade 28.8% of a-Endosulfan and 22.3 of β-Endosulfan at the concentration of 1mM endosulfan. Gas chromatograms at 0 and 80h cultivations were almost the same, suggesting that no significant intermediates were found during biodegradation.
回韓圓板生物膜法으로 都市下水 處理時 圓板表面積과 附着汚尼量에 대하여
李正奎,朴永圭,李哲熙,徐裕德 嶺南大學校 環境問題硏究所 1987 環境硏究 Vol.6 No.2
This paper discussed on the sruface area of disc and the amount of attached biomass by kinetics cinstant at each stage, for treating sewage with rotating biological contactor (RBC). The results are shown as follows; 1. It was found in all experiment that substrate removal could bo divided into two phase. Over 60% of substratre was removed in the first phase. The first phase consisted of the first stage. The remaining substrate removed in the second phase consisting of the second, third and fourth stages. Since the majority of the substrate was removed in the fitst stage and very little in the remaining stages, reducing the distance between the disc in the second phase was necessary for better efficiency in RBC design. 2. The determined saturation constant (㎏) and area capacity constant (p) for calculation of the surface area of disc were ; 69.0, 70.4 at first stage, 88.0, 74.6 at second stage and 137.0, 82.0 ar third and fourth stages, respectively. 3. Thickness of the attached biomass (film) was between 0.34mm and 3.3mm, and the percentages of contained water in the film was approximately 97%. It was also observed that the maximun value of the dry sludge index (DSI) was almost unchanged beyond the effluent concentration of 60㎎/ℓ.
서유덕(Yu-Deok Seo),윤성기(Sung-Kie Youn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Recently, spline finite element analysis was proposed for the purpose of direct interaction between modeling and numerical analysis. In this method, spline basis functions and control points which determine geometries play the same roles with shape functions and nodes in FEM, respectively. Since the CAD data of geometries such as NURBS(Non-Uniform Rational B-Splines) are employed for numerical analysis, finite element analysis can be performed in natural way with efficiency and geometrically exact analysis results can be obtained. In this work, for the integration of analysis and optimization, structural optimization approach incorporating with spline finite element analysis is presented. Control points are used as design variables and spline basis functions are used to represent geometry, field variables and optimal design. The validity and efficiency of the proposed approach is verified by applying benchmarking problems.
서유덕(Yu-Deok Seo),김현중(Hyun-Jung Kim),박상훈(Sang-Hoon Park),김지연(Ji-Yeon Kim),엄태경(Tae-Kyoung Uhm),윤성기(Sung-Kie Youn),이상률(Sang-Ryool Lee),이승훈(Seung-Hoon Lee),이덕규(Deog-Gyu Lee),이응식(Eung-Shik Lee),장홍술(Hong-Su 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Optical performance of mirror for satellite camera is highly dependent on the adhesive properties of its support. Therefore, in order to design the mirror with high optical performance, the mechanical properties of adhesives should be well defined. In this paper, the mechanical properties of three kinds of space adhesives are studied. First, the elastic moduli of the adhesives are investigated. Tension tests of the adhesives are performed at some chosen temperatures within the prescribed temperature range. From the tension test results, the elastic moduli of the adhesives are expressed as a function of temperature and the sensitivity with respect to temperature are discussed. Secondly, the adhesive strengths of the adhesives are investigated by the lap shear test. The lap shear tests are performed with Zerodur-to-metal lap shear specimen as well as metal-to-metal one. And it is also investigated whether reliable adhesive strength can be secured after the specific thermal cycle.