철갑탄 피격에 의한 금속재료의 손상유형 연구 및 설계 적용

현영진,원태훈,정재권,황정선 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.4

D₂EHPA에 의한 우라늄(Ⅵ) 추출

현영진 제주대학교 1993 논문집 Vol.36 No.-

D₂EHPA에 의한 우라늄(VI) 추출실험결과로 부터 다음과 같은 결론을 제시할 수 있었다. 1. 우라늄(VI) 추출효과를 확인하기 위한 수용상 최대 pH는 4.5로 나타났다. 2. 저부하 우라늄(VI) 추출결과는 반응에 참여하는 D₂EHPA양이 아주 적어 ?? 조건에서 설정한 추출상수 ( ?? )에 의해 해석할 수 있었고 우라늄(VI) 착체의 중합도 (j)와 자유 D₂EHPA몰수는 각각 1로 확인되었다. side reaction coeffcient α=1 이어 우라늄(VI) 착체의 가수분해를 무시할 수 있었다. 3. 고부하 우라늄(VI)이 추출결과는 반응참여 D₂EHPA 양의 증가로 중합도를 고려한 r 및 [ ?? ]항으로 표시된 추출상수 ( ?? ) 의해 해석할 수 있었고 우라늄(VI) 착체의 중합도 (j)와 자유 D₂EHPA몰수는 각각 2, ½로 확인되었다. 우라늄(VI)이 중합반응에 의해 추출되어 고부하 우라늄(VI) 추출조건은 액막에 의한 우라늄(VI) 추출의 조업범위로 제시할 수 있었다. 기호설명 α : side reaction coefficient [-] C : concentration [mol/㎥] D : distribution coefficient [-] K??? : extraction constant defined by Eqs. (3) K??? : extraction constant defined by Eqs. (10) L??? : loading ration [-] r : ratio of uranium(VI) complex species ------ (HX)₂ : D₂EHPA extractant U(VI) : ?? in aqueous phase [ ] : concentration [mol/㎥] 부호설명 - : organic phase o : initial value t : total value n : mol number of free D₂EHPA N : polymerization steps of uranium(VI) complex j : polymerization degrees of uranium(VI) complex 1 The uranium(VI extractions with the aqueous pH, the pH concentraction and the uranium(VI) concentraction were carried out. The uranium(VI) extractions to the maximum pH 4.5 were possible. The results of uranium(VI) extraction ( ?? ) were analyzed by the extraction constant ( ?? ) derived under the condition of ?? . The polymerization degree(j) of uranium(VI) complex and the mol number of free D₂EHPA respectively indicated 1. Therefore these conditions showed the uranium(VI) extraction for low loading ratio. The results of uranium(VI) extraction( ?? ) were analyzed by the extraction constant ( ?? ) derived as the terms ( ?? ) considering the polymerization degrees. The polymerization degrees of uranium(VI) complex and the mol numbers of free D₂EHPA respectively indicated 2 and ½. These conditions showed the uranium(VI) extraction for high loading ratio. Therefore they were presented as the operating ranges of uranium(VI) extraction through the liquid membrane.

극한기술에 의한 유해폐기물의 처리

현영진,오윤근 제주대학교 환경연구소 2000 환경연구논문집 : 제주대 Vol.8 No.-

에스테르화에 의한 유채유의 지방산 조성 예측

현영진,서인수 제주대학교 해양과환경연구소 2001 해양과환경연구소 연구논문집 Vol.25 No.-

This experiment was centered on th prediction of fatty acid compositions in rapedseed oil from Canada. The its conditions were molar ratio of methanol to oil(1/10), catalyst content 0.8%(w/w) potassium hydroxide, reaction temperature 45℃. The compositions in rapedseed oil depended on the country on which it grew, the cultivating region, the soil quality, the climate and the kinds of analyizing instrument. The compositions in rapenseed oil from Canada through fatty acid methyl ester reaction were 63.1% oleic acid, 22.3% linoleic acid, 9.6% linolinic acid, 5.0% palmitic and stearic acid.

글리세롤 에테르 첨가 및 바이오디젤 혼합체적%에 의한 바이오디젤유 물성 향상

현영진 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

Addition of 20wt%, 5wt%, 5wt% of glycerol ether to the biodiesel, diesel#2 and their mixed fuel was done. Mixing of diesel#2 with 10vol%, 20vol%, 30vol% of biodiesel was conducted. As the measuring results, glycerol ether addition to the fuels caused the lowering of cloud and pour points for only the biodiesel. And the cloud and pour points of mixed fuels were increased sharply for the mixing of the above 20vol% in biodiesel.

점도 모니터링에 의한 식물유의 바이오디젤화

현영진 제주대학교 공과대학 첨단기술연구소 2007 尖端技術硏究所論文集 Vol.18 No.-

The transesterification of vegetable oils such as canola oil, soybean oil and corn oil with the amount of catalyst and molar ratio of methanol to oil was performed at 60℃ and lOOOs^(-1) of shear rate on the rotary viscometer. The viscosity of fatty acid methyl ester at different temperature was estimated by Orrick and Erbar's model, he overall yield was predicted through monitoring the viscosity of fatty acid methyl esters. The overall yield at the 1:6 molar ratio and 0.6wt% NaOH for vegetable oils showed 85 - 95% for 6.1 - 6.8mm^(2)/s of viscosity in 25 minutes and was predicted well by the relation of viscosity (n_(mix)) monitored.

이중액막에 의한 우라늄(VI)연속추출의 해석

현영진 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-

The uranium(V1) extraction in the continuous vessel was carried out with the flow rates of continuous and organic phase. The initial concentration of uranium(VI) in the external aqueous phase was 1,000 ppm. The mechanism of batch uranium(VI) extraction through the double liquid membrane mediated by DzEHPA was interpreted by the corrected Advanced Front Model. The continuous uranium(VI) extraction was analyzed by the extraction efficiency due to the above model. The times required for uranium(VI) extraction equilibria decreased with the increase of flow rates in the continuous phase under the constant flow rates in the organic emulsion phase. On the other hand, the times required for uranium(VI) extraction increased with the increase with the increase of flow rates in the organic emulsion phase under the constant flow rates in the continuous phase. Therefore the extent of uranium(VI) extraction decreased with the decrease of the times required for the uranium(VI) extraction equilibria. The main operating variable to increase the uranium(VI) extraction efficiency was proved to be the flow rates of continuous phase. The prediction of the optimum operating conditions for the increase of uranium(VI) extraction satisfied with the decrease of the times required for the uranium(VI) extraction equilibria was necessary for this experiment.

알칼리 촉매 전이에스테르화에 의한 식물유의 바이오디젤유 전환

현영진 濟州大學校 基礎科學硏究所 2002 基礎科學硏究 Vol.15 No.2

전이에스테르화를 통해 대두유 유채유와 트리올레인을 바이오디젤로 전화시켰다. 반응시간, 메탈올과 오일의 몰비, 알칼리 촉매 함량, 유화제 체적 함량의 변화에 따라 식물유의 FAME 총괄수율 변화를 고찰하였다. 반응온도 45℃, 반응몰비 6/1, 반응시간 30분일때 트리올레인의 경우 1Wt% 소듐메톡시드, 유채유의 경우 1.0Wt% 포타슘 하이드록시드(1Vot% 유화제), 대두유의 경우 0.8Wt% 소듐메톡시드(1Vot% 유화제)에서 각기 총괄수율이 가장 높았다. 유화제 첨가는 각 불포화 지방산의 수율증가에 영향을 미쳤다. 그리고 식물유의 불포화지방산 함량이 오일의 전이에스테르화에 주요 인자로 나타났다. Transesterfication of such vegetable oils as soybean oil and rapedseed oil including triolein was carried out to produce the biodiesel. Sodium methoxide and potassium hydroxide were used as catalysts. The overall and FAME yield of vegetables oils incresed with time, molar ratio, weight percentage of catalyst, and volume percentage of emulsifier. So, the optimum ranges of operating variables were as follows: reaction time of 30 min, reaction temperature of 45℃, 6/1 in molar ratio of methanol to oil, 1.2Wt % sodium methoxide for triolein, 0.8Wt % sodium methoxide and 1Vol% emulsifier for soybean oil, 1.0Wt % potassium hydroxide and 1Vol% emulsifier for rapedseed oil. The weight percentage increase of unsaturated fatty acid in vegetable oils resulted in the increase of overall and FAME yield. The effect of the emulsifier on the FAME yield was more significant. Also the weight percentage of the unsaturated fatty acid in vegetable oils was proved to be a main factor in transesterfication of vegetable oils.

[특집 : 제주산업의 현황과 문제] 제주시 산지천의 오염수준 예측에 관한 조사

현영진 제주학회 1990 濟州島硏究 Vol.7 No.-

"제주시 지역의 환경오염수준에 관한 조사"

현영진 濟州大學校 海洋硏究所 1989 해양과환경연구소 연구논문집 Vol.13 No.-

"A Survey on the Levels of the Environmental Pollution in the Cheju City Area." The results of the questionnaire on the level of the environmental pollution in the Cheju city area are as follows. 1. From the views on the pollution of brooklets(66%) and the coastal area(60%) that is caused by the uncontrollable streaming of municipal wastewater, it is supposed that the brooklets are more polluted than the coastal area. The combusted gas emissionn from the cars(64%) restults in the air pollution of our area. Our area is supposed to be most polluted in summer(67%), the old Cheju City is more polluted than the new Cheju City(54%), and roadside areas crowded with stores are also polluted(40). The traffic nioses have the greatest impact on the house living(72%), and they are usually generated in summer(77%) and in the afternoon(78%). 2. Comparing the degree of purchases of the alkaline ionizer after judging the polluted level of drinkable water(47%) with the interst in the boiler life in clearing the boiler, it is supposed that the habitant in our area has the more reasonable attitude toward the water pollution than toward the air pollution. 3. protecting plans for the environmental pollution on which the frequently coming tourists for the areal peculiarity(destination) has impact(66%) are to be established.