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유현철(Hyun Chul Yu),박승조(Seung Cho Park) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.10
불소이온을 함유한 폐수로부터 불소 이온제거는 입자상 알루미늄 충전복극전해조를 사용하여 실험적으로 검토하였다. 실험결과 불소제거효율은 전압, 전해시간, 전극간격, 충전율 등에 의존적이었다. 10 V와 15 V의 전압으로 30분간 전해했을 때 불소제거효율은 각각 77, 89%이였다. 전하부하 35.0 F/m3에서 70%의 불소이온 제거효율은 70%이었고 55.0, 85.5 F/m3에서 불소제거효율은 각각 85, 92%였다. The removal of fluoride ion from wastewater containing fluoride ion was experimentally investigated using a bipolar packed bed electrolytic cell with granular aluminium. The experimental results showed that the removal efficiency of fluoride ion depended upon the applied cell voltage, electrolysis time, distance of electrode and volume of packed bed loaded with granular aluminium. When the sample solution electrolysed during 30 min under the conditions of 10 V and 15 V cell voltage, removal efficiency of fluoride ion was 77% and 89%, respectively. Fluoride ion removal efficiency was 70% for a 35.0 F/m3 charge loading and 85% and 92% for a 55.0 and 85.5 F/m3 charge loading, respectively.
전해 Cu Via-Filling 도금에서 염소이온이 가속제와 억제제에 미치는 영향
유현철(Hyun-Chul Yu),조진기(Jin-Ki Cho) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.4
Recently, the weight reduction and miniaturization of the electronics have placed great emphasis. The miniaturization of PCB (Printed Circuit Board) as main component among the electronic components has also become progressed. The use of acid copper plating process for Via-Filling effectively forms interlayer connection in build-up PCBs with high-density interconnections. However, in the case of copper-via filled in a bath, which is greatly dependent on the effects of additives. This paper discusses effects of Cl ion on the filling of PCB vias with electrodeposited copper based on both electrochemical experiment and practical observation of cross sections of vias.
CFD를 활용한 수처리공정 대형관에서 압력수 혼합공정 평가
조영만 ( Young-man Cho ),유현철 ( Hyun-chul Yu ),장경혁 ( Gyeong-hyuk Jang ),정용준 ( Yong-jun Jung ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.3
Mixing is a very important unit in water treatment process. A mechanical stirring method is generally used for mixing, but recently, the use of pressurized water mixing method (pump diffusion flash mixer) has gained interest because it is more advantageous in terms of mixing time, noise, energy consumption, and maintenance. The following conclusions were obtained from the study of pressurized water mixing method by Computational Fluid Dynamics. Firstly, the mixing degree in the pipe increased as the density of water increased. Secondly, even if the relative velocity between flow rate in the pipe and the pressurized water was constant, the mixing degree decreased as the flow velocity in the pipe increased. Thirdly, the stronger the injection energy the higher the mixing degree. It was also found that the mixing degree was greatly affected by the injection velocity as compared to the injection flow amount. Finally, the required energy to achieve 95% mixing degree at the distance of 10 times diameter in big pipes of 500 mm to 3000 mm was 0.3 to 4.5 kJ. The result of this study could be used in the process design of injection with water purification chemicals, such as, ozone, chlorine, and coagulant.
유현철,김정섭,곽명화,윤철종,이희인,박승조 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1
Problems of wastes that pigs produce are increasing rapidly in the hog raising industry nowadays. consequently, the generation volume of excreta also is increasing but most of that is not disposed appropriately and exposed in eco-system therefore the disposal of stock excreta is becoming more and more serious. considering the physical and chemical characteristics of livestock excreta, the pollution loading rate - BOD, COD etc. - is very high. as alternative plan, that is, as one method kind of composisting, the utilization of the soil reformation agent will become one solution in managing the upper problems. also, the flyash of 3.7 million tons are producing every year and about 32.2% of that, 1.18 million ton is recycled as concrete, cement, cementassistance, road etc. consequently, the discharged flyash is not abandoned and a plan of recycling is needed acutely. gypsum of 4.16 million tons in 1998 presently was produced and about 57.2% of that, 2.38 million tons was recycled as cement, construction materials. the present stock is 25 million tons. therefore, in this study, because organic materials can be obtained in pig excreta and calciums can be obtained in gypsum, the small amount of elements can be acquired in flyash for the soil reformation agents, mixing the three materials - pig excreta, gypsum, flyash - adequately, investigated technique of making the soil reformation agents and described below in comparrision with the changes of temperature, PH TOC, T-N, TOC/T-N ratio etc.
유현철,신남철,우성훈,박승조 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-
We have investigated physicochemical characteristics and behavior of chlorpyrifos(CPF) in the agricultural soil, soil + dry waste food(DWF) and soil +manure. Experiments were accomplished biological degradation of samples loaded with chlorpyrifos in incubator at 27℃ during 30days in laboratory. In this study, Sample containing soil + manure has shown to be better biological degradation than sample of soil + DWF. The kinetics of chlorpyrifos oxidation catalyzed by agricultural soil, soil + DWF, and soil + manure can be described by Henri-Michaelis-Menten equation, V=(Vmax)/( Km+ C), where Vmax is the maximum velocity and Km the concentration of the substrate(C) corresponding to an initial(V) half of Vmax. The value of Vmax and km is 0.0588㎍CPF/g.soil.hr and 7.3529㎍CPF/g.soil in agricultural soil, 0.0601㎍CPF/g.soil∙hr and 4.4117㎍CPF/g.soil in the soil loaded DWF and 0.0890㎍CPF/g.soil∙hr and 4.2818㎍CPF/g.soil in the soil added manure. Therefore the order of Vmax. were Manure> DWF> Agricultural soil.
이경화,김정섭,유현철,최성우,윤철종,우성훈,박승조 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1
Adsorption equilibrium of heavy metals ion on the peat moss was confirmed Frundlich isotherm Removal efficiency of heavy metals ion was increased from pH 2 to 10 and heavy metal removal efficiency was increased in the sequence of Cu(Ⅱ) > Pb(Ⅱ) > Cd(Ⅱ) > Mn(Ⅱ) on the PM(Peat Moss). The PM is likely to be more effective adsorption than the PAC to removal of metal ions in the solution, since PM's weakly acidic functional groups which is not founded on the PAC, in addition to its high surface area and porosity. But, the PM is not separated from the solution water by sedimentation process. So, a liquid and solid seperation between the PM and the solution water could be considered for the PM's field application. But peat moss was low cost adsorbent. Thus author propose to adopt PM as a adsorbent for heavy metal removal.
김은정,박정훈,김정섭,유현철,이봉섭,곽명화,우성훈,박승조 東亞大學校 環境問題硏究所 2005 硏究報告 Vol.27 No.1
Spent pig bone was consist of hydroxyapatite. And then we thought that it have a possibility as a adsorbent. The preparation of bone char prepared from spent pig bone in this study. We study on the recycling possibility as a adsorbent is able to adsorb copper ion from their single aqueous solutions. The results are summarized as follows. Bone char that prepared from spent pig bone at 105, 400, 700℃. The adsorption removal efficiency of copper ion onto bone char as adsorbent was above 90% for 15 hours. Increase in the initial pH of the copper ion solution result in an increase in the copper ion uptake per unit weight of the adsorbent. Freundlich isotherm model was found to be applicable for the experiment data of copper ion. The results showed that spent pig bone can be used for the absorption of the copper ion.
김영환,박정훈,김정섭,유현철,이봉섭,곽명화,우성훈,박승조 東亞大學校 環境問題硏究所 2005 硏究報告 Vol.27 No.1
This study was carried out to remove copper ion in case of activated carbon impregnated sulphur(ACS) dose and different pH using activated carbon impregnated sulphur that prepared from activated carbon at sulphur dioxide atmosphere. Removal copper ion concentration was increased as increasing the ACS dose when copper ion concentration was 10 mg/L. Optimum dose of ACS 13.3 g ACS/L and maximum removal efficiency was 93%. The results obtained from adsorption experiment in the condition of ACS optimum dose when the pH was 3, 4, 5 respectively was pH 5 was excellent.