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기술정보 : 난분해성 후렉소잉크 폐수중 유기물 및 색도제거를 위한 철촉매 공기산화 공정의 적용
조용덕 ( Yong Duck Cho ),윤현희 ( Hyon Hee Yoon ),박상준 ( Sang Joong Park ),김종성 ( Jong Sung Kim ),이상화 ( Sang Wha Lee ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.4
The oxidation processes of metal catalysis were practically applied into the flexographic inks wastewater treatment to derive the most effective and economical system among all the processes of iron-salts coagulation, iron-catalyzed air oxidation, and coagulation followed by biological treatment. The iron concentration and pH were optimized as 2.8×10(-3) mol and 5.5~6.0, respectively, for all the oxidation processes. At the optimal reaction conditions, the removal efficiencies of TCOD(Mn) and Color were as follows for the respective process: ⅰ) 75% TCOD(Mn) and 77% Color removals for iron-salts coagulation, ⅱ) 91% TCOD(Mn) and 90% Color removals for iron-catalyzed air oxidation, ⅲ) 74~92% TCOD(Mn) and 81~90% Color removals for coagulation followed by biological treatment. Based on the economical and technological aspects, iron-catalyzed air oxidation was confirmed as the most effective process in the treatment of industrial wastewater.
지배미분방정식 해법을 이용한 P.S.C 보의 시간 종속적 처짐해석
조용덕 ( Cho Yong-duck ),이용학 ( Lee Yong-hak ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
A governing differential equation (GDE) of prestressed concrete (PSC) beam considering the long term losses including concrete creep, shrinkage, and PS steel relaxation is derived based on the two approaches. The first approach utilizes the force and moment equilibrium equations derived based on the geometry of strain states decomposed of the uniform and curvature strains while the second one utilizes the principle of minimum total potential energy formulation. The identity of the two GDE's is verified by comparing the coefficients consisting of the GDE's. In addition, the boundary conditions resulting from the functional analysis of the variational calculus are investigated. The applicability of the GDE's is illustrated through the numerical analysis of the rectangular-typed section PSC beam with prestressing and nonprestressing steels.
유한차분법을 이용한 PSC 거더의 시간 종속적 거동해석
조용덕 ( Cho Yong-duck ),주영태 ( Ju Young-tae ),이용학 ( Lee Yong-hak ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
Time-dependent Governing Differential Equations (GDE) of prestressed concrete (PSC) bridge girders considering the long term losses including concrete creep, shrinkage, and PS steel relaxation are derived based on the principle of minimum potential energy. The GDE's are solved using the Central Finite Difference Method with the various boundary conditions in which the shape of deflection curve is assumed to be a second order polynomial. The formulation covers the straight and curved PS steel layouts, and the constant and variable cross sections. Time dependent numerical analysis of PSC flexural members with rectangular cross section reveals the applicability for the proposed numerical procedures and show a good agrement with the experimental results.
증례 : 류마티스 ; 다운증후군 환자에서 병발한 재발성 다발연골염과 괴저성 농피증 1예
조용덕 ( Yong Duck Cho ),이연아 ( Yeon Ah Lee ),박지나 ( Ji Na Park ),이상훈 ( Sang Hoon Lee ),양형인 ( Hyung In Yang ),홍승재 ( Seung Jae Hong ) 대한내과학회 2009 대한내과학회지 Vol.76 No.5
염증성 장질환과 괴저성 농피증이 동반되어 나타나는 경우는 다수 보고되었지만, 재발성 다발연골염과 괴저성 농피증이 동반한 경우는 현재까지 보고된 바 없다. 본 저자들은 다운증후군 환자에서 괴저성 농피증을 동반한 재발성 다발연골염 1예를 경험하였기에 문헌고찰과 함께 이를 보고하는 바이다. Relapsing polychondritis (RP) is a rare multisystem disorder of unknown etiology that affects cartilaginous tissues, such as the auricular, nasal, and laryngotracheal cartilages. It may be accompanied by a wide spectrum of skin lesions, including erythema nodosum, erythema multiforme, and panniculitis. Pyoderma gangrenosum is a rare chronic cutaneous disease that usually presents as a painful nodule or pustule and progressively forms an enlarging ulcer. It may be associated with inflammatory bowel disease, rheumatoid arthritis, systemic lupus erythromatosus, leukemia, and myeloproliferative disorders. Pyoderma gangrenosum is rarely associated with RP. RP and pyoderma gangrenosum have been reported in a patient with myelodysplastic syndrome (MDS), and the appearance of skin lesions in MDS may herald its progression to acute myeloid leukemia. Here, we report the first case of RP coexisting with pyoderma gangrenosum in a patient with Down`s syndrome. (Korean J Med 76:632-636, 2009)