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허병용,서양곤 경상대학교 환경보전연구소 1996 環境保全硏究所報 Vol.4 No.1
Fenton's reaction is one of the well-known homogeneous oxidations with ferrous ion as a catalyst and hydrogen peroxide as an oxidant. Fenton's reagent produces hydroxyl radicals by the interaction of ferrous ion with hydrogen peroxide. It can decompose organic substances easily because hydroxyl radicals have the powerful oxidizing ability. In this paper, it was carried out to study on the decomposition of hydrogen peroxide by Fenton's reagent and silica-supported ferrous ion catalyst. The Fenton oxidation was most efficient in the pH range of 3∼5. Increasing the ratio of ferrous iron improved the efficiency of hydrogen peroxide decomposition, but excess dose of ferrous ion over some level did not improve. The optimum ㏖ ratio of ferrous ion to hydrogen peroxide was 1:3. This trend was observed for the silica-supported ferrous ion catalyst. And in this work, the optimum loading of ferrous ion to silica gel for hydrogen peroxide decomposition was 10wt%. If organic compound such as phenol coexists in the solution, hydrogen peroxide can be decomposed rapidly and easily.
TFT-LCD Fab에서의 설비 비부하 원인 분류 및 개선
정병용,허연호,박만헌,장석철 대한산업공학회 2010 대한산업공학회 추계학술대회논문집 Vol.2010 No.11
지난 수십 년간 반도체, LCD 등의 Fab. 기반의 제조업에서는 설비의 최적 활용을 통한 생산성 향상에 많은 노력을 기울여 왔다. 그러나 Job shop 방식의 설비 배치와 Reentrant 방식의 사이클 구조를 가진 제조 프로세스는 생산계획 및 자재흐름의 복잡도를 증가시켜 주요 설비에 대한 운영 관리의 어려움을 야기 시켜왔다. 이에 본 논문에서는 주요 설비의 부하율 향상을 위하여 CET(Cassette Exchange Time)을 정의하고 설비의 Idle을 유발하는 원인에 대한 분류 기준을 정립하였으며 이를 기반으로 주요 설비의 부하율 향상을 위한 관리 방안을 제시하였다.
기타산업공학 : TFT-LCD Fab에서의 설비 비부하 원인 분류 및 개선
정병용,허연호,박만헌,장석철 대한산업공학회 2010 대한산업공학회 추계학술대회논문집 Vol.2010 No.-
지난 수십 년간 반도체, LCD 등의 Fab. 기반의 제조업에서는 설비의 최적 활용을 통한 생산성 향상에 많은 노력을 기울여 왔다. 그러나 Job shop 방식의 설비 배치와 Reentrant 방식의 사이클 구조를 가진 제조 프로세스는 생산계획 및 자재흐름의 복잡도를 증가시켜 주요 설비에 대한 운영 관리의 어려움을 야기 시켜왔다. 이에 본 논문에서는 주요 설비의 부하율 향상을 위하여 CET(Cassette Exchange Time)을 정의하고 설비의 Idle을 유발하는 원인에 대한 분류 기준을 정립하였으며 이를 기반으로 주요 설비의 부하율 향상을 위한 관리 방안을 제시하였다.
서양곤,허병용 경상대학교 환경보전연구소 1995 環境保全硏究所報 Vol.3 No.1
In the last 20 years or so has been as increasing concern about the contamination of drinking water supplies with organic compounds used as solvents in industry. The widely adopted chlorination of potable water has also been shown to have led to the formation of halogenated organic compounds. The removal of low levels of organics is an important problem in drinking-water and wastewater treatment. In this paper, ultraviolet(UV) light irradiation is combined with hydrogen peroxide(H₂O₂) or ozone(O₃) and ferrous ion-hydrogen peroxide system (Fenton's reagent) are reviewed. The processes exhibit a synergistic effect leading to the formation of reactive hydroxyl radicals which can bring about more complete oxidation as well as react with a wider range of organics. New designs that combine hydroxyl radical generation system with ozone, hydrogen peroxide, and UV may emerge as the best commercial prospects for advanced oxidation processes in water and wastewater treatment.
비이온성 수지를 이용한 음이온 계면활성제의 흡착에 관한 연구
서양곤,안주현,허병용 한국환경과학회 1996 한국환경과학회지 Vol.5 No.3
The adsorption of the anionic surfactants, sodium lauryl sulfate (SLS) and sodium dodecylbenzene sulfonate (SDBS) anion surfactants from aqueous solutions with nonionic resins, Amberlite XAD-2, XAD-4 and XAD-7 at temperatures in 15∼45℃ range was studied. Several adsorption isotherm models were used to fit the experimental data. The best results were obtained with the Redlich-Peterson equation and the Freundlich model provided remarkably good fits. For a particular resin at a particular temperature, SDBS was more extensively adsorbed than SLS. The highest adsorption were obtained with XAD-4 resin and the specific surface area of the resins plays a major role in adsorption of the surfactants. Estimations of the isosteric heat of adsorption were indicative of an exothermic process, and their magnitudes manifested a physisorption process.