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기술사마당_기술자료 - 하상여과공법의 유지관리를 위한 조사장치 개발 및 현장 성능평가
오기식,조태호,Oh, Ki-Sik,Cho, Tae-Ho 한국기술사회 2010 技術士 Vol.43 No.2
This research is about the inspection system which is for maintenance of laterals of local RBF(River bed Filtration). Inspection system is designed for local use in order to endure water resistance up to 50m and it also can examine the internal condition and colgging of laterals by moving inside of the laterals about 100m back and forward. We will conduct performance test of inspection system at the lacal RBF site and present its result.
동전해정제시 음극분극전위에 미치는 첨가제의 영향에 관한 연구
오기식,유용주,김영홍 울산대학교 1985 연구논문집 Vol.16 No.2
전해첨가제를 동전해액(황산동-황산)에 각각 단독으로 또는 복합적으로 첨가하여 음극분극전위를 측정함으로써 다음과 같은 결론을 얻었다. 1) 첨가량이 많아짐에 따라 아교와 글리신은 음극분극전위를 현저히 높이며, 아비톤-A는 약간 증가시키고, 티오요소는 소량 첨가할 경우 감소시키나 첨가량이 많아지면 상당히 상승시킨다. 그리고 Cl?은 음극분극전위에 영향을 거의 미치지 않는다. 2) 아교를 주 첨가제로하고 티오요소 및 아비톤-A를 첨가했을 때 티오요소와 아비톤-A는 분극전위에 거의 영향을 미치지 못하고 주로 아교가 영향을 미친다. 3) 아교 5mg/l, 티오요소 3mg/1, Cl? 20mg/l를 가한 전해액을 이용한 일반적인 전해정제로 2.5A/dm²의 고전류밀도에서 평활하고 치밀한 전착면을 얻을 수 있었으며, 불순물의 제거가 가능하고 부동태현상이 발생 하지 않았다. Cathodic polarization potentials during the ectrorefining of copper have been measured under various conditions of addition agents in the copper electrolyte (CuSO₄-H₂SO₄). The results obtained are as follows. 1) The cathode polarization potential is affected by the kind of addition agents and the amount of addition to the electrolyte. Glue and glycine show remarkable increasing effects on the polarization potential, Aviton-A has a little effect. However, thiourea causes the polarization potential to increase considerably at high concentration, but showing a decreasing effect at low concentration. Chlorine has little effect on the polarization potential. 2) In the case of using the electrolyte containing glue with Aviton-A and glue with thiourea as additives, thiourea and Aviton-A have little effect on the polarization potential, while glue shows remarkable effect. 3) The electrorefining was carried out successfully using the electrolyte added glue 5mg/l, thiourea 3mg/l, and chlorine 20,g/l, with the current thiourea 3mg/l, and chlorine 20mg/l, with the current density of 2.5A/dm² for 68hrs at the pilot plant. The surface of deposit copper was smooth and its thickness was uniform, showing the purity of 99.99( copper.
이규택,오기식 전북대학교 공업기술연구소 1985 工學硏究 Vol.16 No.-
Solven extraction is a separation technique in which a solute is transferred from one liquid phase to another immiscible or partially miscible liquid which is in contact with the first phase. In hydrometallurgy, the aqueous phase contains the metal which is to be concentrated into the organic phase. It has been found that Lix 64N are able to separate Cu form Fe, An, Ni, As, etc. ions. The extraction of copper with Lix 64N was carried out at varied pH of aqueous and concentration of organic solvent. The experimental results obtained are summarized as follows ; 1) Loading capacity of Cu^2+ ion increased with raised pH of aqueous but equilibrium extraction was pH 2.0. 2) Loading capacity of Cu^2+ ion lineary increased with increasing concentration of Lix 64N. 3) Continuous solvent extraction circuit was run a stream generated by sulfuric acid leaching solution. the circuit consisted to for extraction stage and two strip stage. It could be seen that was strongly extracted at pH 1.4-1.7 while Fe, Zn, As, and Ni are not extracted.
미얀마 문화유산 관리시스템 구축 배경과 의미 고찰: 문화부문 ODA 사업의 사례
박순철,홍신화,오기식,함한희 무형유산학회 2021 무형유산학 Vol.6 No.2
This paper analyzes the achievements and limitations based on the experience of carrying out ODA (Official Development Assistance) projects, which are somewhat unfamiliar in the field of cultural heritage. The donor country of this project is the Republic of Korea, and the recipient country is Myanmar. In this project, this research team is in charge of building the Myanmar Digital Cultural Heritage Management System (MCHMS), and suggests the meaning of ODA in the cultural heritage sector and future tasks. First, we review the status of ODA in the cultural field in the initial stage in Korea. Second, we examine how the MCHMS was developed. Third, we will analyze the achievements of establishing the MCHMS. Fourth, a reflective analysis is presented in the course of examining the meaning and functions of MCHMS.
이재하,윤정모,오기식 全北大學校 1986 論文集 Vol.28 No.-
Sulfuric acid leaching from converter flue dust and Arsenic slime was studied at varied concentration of H_2SO_4, leaching time, stirring rate, pulp density and leaching temperature in atmosphere. In addition of oxygen gas also examined. To obtain a better understanding of sulfuric acid leaching behaviours of copper Arsenic and Zinc was studied. The experimental results obtained are summarized as follows; 1) Extraction rate of copper, Arsenic and Zinc was 95% at leaching temperature 90℃, pulp density 100g/ℓ, sulfuric acid concentration 70g/ℓ, stirring rate 600rpm, leaching time 80 min. in addition to oxygen gas 200mℓ/min. 2) Extraction rate of copper and Arsenic was 97% at leaching temperature 90℃, pulp density 200g/ℓ, sulfuric acid concentration 90g/ℓ, stirring rate 600 rpm, leaching time 180 min. in addition to oxygen gas 200 mℓ/min. 3) The leaching residues of converter flue dust and Arsenic slime was sulfuric lead.