Micromanganese-Nodule의 選鑛에 관한 硏究(제1보)

엄제현,박동기,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.4

For the purpose of researching of the manganese recovery from the micromanganese-nodule, the test was performed by means of the ζ-potential measuring and of the floatation experiment for manganese recovery of the micromanganese nodule obtained from siliceous deep sea clay. The floatation condition in the floatation experiment were as follow. Sample size : 65mesh∼200mesh. Condition time : 10 min. Flotation time : 4 min. Air amount : 20㎖/min. Promoter : DAS, NaDS. Kerosene Dpresser : Na_2SiO_3(Water glass) PH regulator : HCl, CaO From the above test the flotation results were summerized as follow. (1) ζ-potential of micromanganese-nodule was minus(-) in the pH 3∼12. (2) The manganese recovery from the micromanganese- nodule was the best at pH 7. (3) The manganese recovery from the micromanganese- nodule was the best using DACI 50㎎/ℓ + kerosene 200㎎/ℓ in the promoter at pH 7. (4) The best manganese recoverv of the micromanganese-nodule was 80% using DACI 50㎎/ℓ + kerosene 200㎎/ℓ in the promoter and water glass 500㎎/ℓ in the depresser at pH 7. In the futurity, continuous study of the micromanganese-nodule in many kinds of site should be required.

특징 형상 모델러의 치수 정보 표현에 관한 연구

오익수,변문현 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.1

Features are generic shapes with which engineers associate certain attributes and knowledge useful in reasoning about the product. Feature-based modeling systems support additional levels of information beyond those available in geometric modelers. The objective of this study is to develop a PC level feature-based modeling system which explicitly represents dimensions of the part. The feature-based modeler retains all the benefits of traditional B-rep. solid models, and represents the dimensions at a high level of an abstraction so that dimension driven geometry can be achieved.

고혈압 환자에서 Leukoaraiosis 정도와 망막증과의 연관성 : 예비연구 Preliminary Results

신동익,한현정,서대희,이광훈 關東大學校 醫科大學 醫科學硏究所 2002 關東醫大學術誌 Vol.6 No.1

Changes in the cerebral white matter (leukoaraiosis;LA) are detected with increasing frequency by computed tomography (CT) and magnetic resonance imaging (MRI) in elderly patients with diabetes mellitus and hypertension. The purpose of this study is to determine whether the severity of retinopathy is correlated with degree of LA in patients with hypertension. Twenty-three consecutive patients with patients with hypertension admitted in the department of neurology were evaluated for degree of LA and severity of retinopathy. 8patients were 15female. The age distribution was between 52 and 85 years(mean 69.1years). The duration of hypertension was between 1 and 30 years(mean8.2 years). The degree of LA was correlated with severity of hypertensive retinopathy(p<0.05), especially in relatively young patient, short periods of disease, and female paitents(p<0.05). We can make a rough estimation of degree of LA with fundus examination without CT or MRI evaluations in hypertensive patients, especially in relatively young and female patients with short durations of disease. However, more broad study should be made for these value and relationship.

Todorokite와 δ-MnO₂의 浮遊性에 關한 硏究

엄제현,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2004 産業科學技術硏究論文集 Vol.9 No.1

For the purpose of reserching the floatability of Manganese-nodule, the test was porformed by means of the Zeta potential measuring and the flotation experiment for Todorokite, δ-MnO₂ The flotation condition in the flotation experiment were as follow. sample : Todorokite, δ-MnO₂ sample size : 65 mesh - 200 mesh condition time : 10 min flotation time : 4 min air amount : 20 ㎖/min promoter : D.A.Cl, S.D.S pH regulator : HCl, CaO From the above test the flotation result were summerized as follow. 1. The point of zero charge(PZC) of Todorokite in the Zeta potential measuring was pH4.3. 2. The point of zero charge of δ-MnO₂ in the Zeta potential measuring was pH3.0. 3. The best floatability of 8 δ-MnO₂ was 85% as a function of pH3.5 using DACl 10㎎/ℓ 4. The best floatability of Todorokite was 40% as a function of pH3.5 using DACl 10㎎/ℓ 5. The most difference of floatability of the δ -MnO₂ and Todorokite was 40% using DACl 10m㎎/ℓ at pH3.5

10Å Manganite와 δ-MnO_(2)의 부유성에 관한 연구

엄제현,김익수,성일용,김종윤,김진석 三陟大學校 2006 論文集 Vol.39 No.-

For the purpose of researching the floatability of 10Å Manganite and δ-MnO_(2) from Manganese layer, the test was performed by means of the Zeta potential measuring and the floatation experiment for 10Å Manganite, δ-MnOcc. The floatation condition in the floatation experiment were as follow. Sample : δ-MnO_(2), 10Å Manganite from Manganese layer Sample size : 65mesh ~ 200mesh. condition time : 10min. Flotation time : 4 min. Air amount : 20ml/min. Promoter : DACl, NaDS, Kerosene Dpresser : Na_(2)SiO_(2)(Water glass) PH regulator : HCl, CaO From the above test the floatation result were summerized as follow. 1) It was PH 2.3 that the PZC of the 10Å Manganite - rich from Manganese nodule in the ξ - potential measuring. 2) It was PH 3.0 that the PZC of the δ-MnO_(2)- rich from Mangnaese nodule in the ξ - potential measuring. 3) It was 35% using DACl 15mg/l at PH 2.7 that the most difference of floatability of the δ-MnO_(2)- rich and 10Å Manganite - rich.

황산화 부선법에 의한 방연광의 억제에 관한 연구

엄제현,박동기,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.1

The applicability of a sulphation-floatation process was considered in order to depress of galena in a mineral processing process of complex sulphide ores. The galena will be depressed in the floatation step because of the formation of a PbSO₄ film on the surface of galena. when a PbS bulk concentrate is treated with sulphuric acid. The optimum conditions of the sulphation treatment for depressing galena were found to be 30%. and about 5 minutes of retention, with 18 Vol. % H₂SO₄. under these conditions. galena was sulphated only slightly and thus in complete depression in the floatation.

이혼·별거 전후의 소득변화와 영향요인

박현정,정익중 梨花女子大學校 社會科學大學 社會科學硏究所 2012 사회과학연구논총 Vol.28 No.-

이혼·별거 가구의 빈곤문제가 심각함에도 불구하고 이에 대한 종단적 연구는 부족한 실정이다. 따라서 본 연구는 이혼·별거 전후의 소득변화와 그에 영향 미치는 요인을 살펴보고자 한다. 한국노동연구원이 1998년부터 2008년까지 조사한 한국노동패널 1~11차년도 자료를 사용하였고 분석대상은 총 244명이었다. 잠재성장모형의 분석결과, 소득은 남녀 모두 이혼·별거 전후에 걸쳐 계속 감소하는 변화궤적을 보여주었다. 소득의 초기치에 영향을 미치는 요인은 연령, 주거이동 유무, 성인과의 동거여부, 취업유무로 나타났다. 연령이 높을수록, 주거이동 경험이 없는 경우, 혼자 사는 경우, 취업자의 경우 소득의 초기치가 높은 것으로 나타났다. 소득의 변화율에 영향을 미치는 요인은 학력, 주거이동 유무, 자녀와의 동거여부로 나타났다. 학력이 높을수록 소득이 급속히 감소하는 것으로 나타난 반면 주거이동 경험이 없거나 자녀와 동거할 경우 소득이 완만히 감소하는 것으로 나타났다. 본 연구결과는 이혼·별거 전후 소득변화를 이해하고 사회복지 개입방안 모색에 필요한 기초자료를 제공하였다. In spite of serious poverty of divorced·separated families, studies on them are insufficient. Therefore, this study is to examine the change of income before and after divorce·separation and factors having an effect on it. It used Korean Labor & Income Panel Study data from the first year(1998) to the eleventh year(2008), administered by Korea Labor Institute and study sample was total 244 people. The income of men and women was continuously decreased throughout the last year, the year and the next year of divorce·separation. Based upon results of latent growth models, the factors having an effect on the intercept were age, residental moving, living with adults, and whether working or not. The intercept was high as age is old, and case with no residental moving showed higher intercept than case with residental moving. Both cases who lived alone and worked at that time showed higher intercept. The factors having an effect on slope were academic background, residental moving and living with children. Income was rapidly reduced as education level is high. And case with no residental moving and living with children showed smoothly reduced income than case with residental moving and living alone. The results of this study can provide the fundamental background which is necessary to understand the change before and after divorce·separation. Finally, implications for family welfare practice were discussed.

Mn-nodule의 선광에 관한 연구(제1보)

김익수,박동기,성일용,김승혁,엄제현 三陟大學校 2000 論文集 Vol.33 No.1

For the purpose of reserching the floatability of Managanese-nodule, the test was proformed by means of Zeta potential measuring and the flotation experiment for 10Å Manganite. The flotation condition in the flotation experiment were as follow. sample : Todorokite (0.3gr) sample size : 65 mesh ~ 200 mesh condition size : 10 min flotation time : 4 min air amount : 20 ㎖/min promoter : D.A.cl, S.D.S. PH regular : Hcl, CaO From the test the flotation result were summerized as follow. 1. The isoelectric point of 10Å Manganite in the Zeta potential measuring was pH 4.3. 2. The floatability of 10Å Manganite was 80% as a function of pH5 using 10mg/ℓ of D.A.cl. 3. The recovery of 10Å Manganite was best when the floatability of 10Å Manganite was 90% as using D.A.cl 80mg/ℓat PH 2.7.

NURBS 곡면과 경계표현에 의한 솔리드모델의 결합에 관한 연구

변문현,오익수 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2

Geometric modeling system is a fundamental module in the CAD/CAM system. Solid medeling has been usually used in analytical geometric shape modeling and surface modeling is very useful to represent a free form surface. But the most of industrial products consisit of compound surfaces that are formed with free form surface and analytical surface. Therefore, solid modeling system should support to form a compound surface. In this study, a solid model and a NURBS surface are combined to represent a compound surface and all the compound surfaces are represented by halfedge data structure.

특징 형상 모델링에서의 DDG(Dimension Driven Geometry)를 위한 표현 구조에 관한 연구

오익수,변문현 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

Most of the geometric modeling system uses CSG or boundary representation scheme. But these representation schemes can only support limited topological and geometric information. In an automated CIM environment, the additional data such as dimension, tolerance, feature information must be prepared in the design stage. Feature-based design implies a more convenient design environment and can provide more useful data in the CAM application. Dimension-driven geometry mechanism provides a natural and efficient method for modifying geometry. This study presents a representation scheme for explicitly representing dimensions and form reatures in boundary representation solid models.