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정일현,전해수 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.2
반응기 내 유체를 전기화학 반응시켜 만든 추적자를 이용하여 반응기를 해석하였다. 주입점 전역에서 추적자가 균일하게 발생되도록 분산판을 이용하여 이상적인 단계 함수를 주입하여 이때 얻어진 응답만으로 고정층 반응기에 대한 단일 매기 변수(one parameter) 모델식의 축 방향 분산 계수 산출의 여러 방법을 비교 검토하였다. 그 결과 분포 곡선의 최대치는 실험 값보다 모두 크게 나타났으며, 오차가 가장 작은 방법(method) III는 1.04% 이내의 오차를 나타내었다. 이 방법으로 부터 구한 축 방향 분산 계수는 다음과 같이 나타낼 수 있다. D_L = 0.82U^(0.983)_S dp^(0.933), (㎠/sec) The reactor was analysed by a tracer, which was made by electrochemical reaction out of fluid. Tracer was injected as a step of idealized shape in distributor, which evenly made the tracer. Axial dispersion coefficients are estimated from various methods of parameters model in inert fixed bed reactor by the analysis of the ideal step function technique. As a result, maximum values of distribution curves are higher than experimental value, and the response signals predicted are then compared with the measured signal; Method III agrees well with the measured signal: Method IV is very close to the measured signal, but Method II deviates significantly from the measured signal: Method IV is found to give parameter values close to those of the Method III analysis, from which the most realiable values are obtained. Next to the Method IV are, in order of Method IV fitting, the Method V and Method I and Method II. The experimental error of Method II is 1.04 %. Using the axial dispersion coefficient estimated from Method III, we could obtained the following relationship. D_L = 0.82U^(0.983)_S dp^(0.933), (㎠/sec)
정일현,현상원 단국대학교 1999 산업기술연구 Vol.1 No.-
In this study, we prepare non-porous plasma membrane that is made by CHF_3 the plasma polymerization of CHF_3 on the Al_2O_3 substrate with the different pore size from the Al_2O_3 membrane with the different pore size by using CHF_3 monomer and research the permeability characteristics of the plasma polymer membrane after plasma polymerization. Also, we research the effect on gas permeation mechanism with substrate pore size. The selectivity is very increased according to Ar plasma treatment time and rf-power at closing the intervals of substrate and cathode, but the permeability is decreased. It is applied solution-diffusion model to non-porous membrane, but it is applied Knudsen diffusion model to the Al_2O_3 membrane with the different pore size. We know that the pore size of Al_2O_3 membrane influence on the permeability and the intervals of substrate influence on selectivity.
에탄올-물 혼합 용매 속에서 포화염의 활동도 계수(1)
鄭一鉉,朴慶愛 단국대학교 1988 論文集 Vol.22 No.-
A model for Estimation of the ionic activity coefficient for ternary solution system was developed from the basis of binary solution system model analytically. In consideration of ionic effect abd nonionic effect in the electrolyte solution, the activity coefficients of mixed solvent were calculated by the presumed parameters. Therefore, mean molal ionic activity coefficient in the ethanol-water saturated solution wuth sodium chhloride was estimated with this ternary solution system model corrected by these presumed parameters, G_(±t) and Z_(±t). The measuring experiment of solubility was carried out by measuring of electromotive force of the ternary solution in the whole range of the ratio for ethanol to water.
정일현,나춘기 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-
Cathode ray tubes(CRTs) in television and computer monitors are one of the most common components of discarded electronics in the solid waste stream. CRTs present a disposal problem because of their growing magnitude in municipal solid waste (MSW) and their role as a major source of lead in MSW. Using the EPA Toxicity Characteristic Leaching Procedure(TCLP), lead leachability from CRTs was studied. Lead leached from the CRT samples at an average concentration of 18.5㎎/ℓ. This exceeded the regulatory limit of 5.0㎎/ℓ. Several factors affected the lead concentration of each CRT sample.
정일현,김종오 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-
The objective of this study was to investigatae the biodegradation of organics, nitrogen, and phosphorus with BNR (Biological Nutrient Removal) technology. The BNR performance was monitored in terms of HRT (Hydraulic Retention Time). The BNR was capable of achieving nitrogen removal efficiency as much as 57% and phosphorus removal efficiency as much as 72%. The optimal condition at HRT of 2 hr was obtained. As a result of kinetic experiment, k and K_s were found to be 0.025 d^-1 and 30.4㎎/ℓ, respectively.
정일현 목포대학교 연안환경연구소 2000 沿岸環境硏究 Vol.17 No.1
Composting process of organic wastes, closely related to the mechanization of organic farming, could induce the uses of the compost to restore farmlands. This study was to compost the mixture of night-soil treatment sludge and rice wine-lees waste, both of which are organic wastes, and to systemize the proper composting process of organic waste so as to recycle them for agricultural purposes. Also the purpose of this study is to examine the possibility to retrieve the fermenting heat produced in the produced in the process of composting, to improve the unit operation skills for producing compost and using it, and to present a method for reusing highly concentrated organic wastes as a resource of agricultural productivity.