천연 벤토나이트로부터 합성된 제올라이트 A의 특성

이재영,조승래,이홍기,심미자,이주성,김상욱,Lee, Jae-Yeong,Jo, Seung-Rae,Lee, Hong-Gi,Sim, Mi-Ja,Lee, Ju-Seong,Kim, Sang-Uk 한국재료학회 1995 한국재료학회지 Vol.5 No.8

경북 감포지역에서 산출되는 천연 벤토나이트를 이용하여 제올라이트를 합성하였으며 세제용 builder로서 가능성을 연구하였다. 최적의 합성조건은 기질의 몰비가 SiO$_2$/Al$_2$O$_3$=2, $Na_2$O$_3$/Al$_2$O$_3$=1, $H_2O$/A1$_2$O$_3$=30이고 9$0^{\circ}C$에서 3시간 반응시킬 경우였고, 이 조건에서는 A형 제올라이트가 합성되는 것을 XRD를 통하여 확인하였다. 최적 조건에서 합성된 제올라이트의 이온교환능을 측정하기 위하여 경도 40$^{\circ}$Dh의 CaCl$_2$용액과 3$0^{\circ}C$에서 IS분 접촉시킨 결과 264.9mg CaO/g-zeolite 정도로 우수한 값을 나타내었다. 이 시료의 백색도는 89%이었고, 평균 입자크기는 9.95$\mu\textrm{m}$이었다. Synthetic zeolite was prepared by using of natural bentonite from Kampo area and the application of detergent builder was investigated. The optimum synthetic condition was SiO$_2$/Al$_2$O$_3$= 2, Na$_2$O/A1$_2$O$_3$=1, H$_2$O/A1$_2$O$_3$=30 at 90$^{\circ}C$ for 3hr and it was found by XRD analysis that the zeolite synthesized under this condition was type A. When the zeolite A synthesized under the optimum condition was contacted with 40$^{\circ}$Dh CaCl$_2$solution at 30$^{\circ}C$ for 15min, the cation exchange capacity was 264.9mg CaO/g-zeolite. And the whiteness of the sample was 89% and the mean particle size was 9.95$\mu\textrm{m}$.

금속폐광산주변의 토양, 식물 및 하천의 중금속오염에 대한 지화학적 연구 -달성 및 경산광산-

이재영,이인호,이순영,Lee, Jae Yeong,Lee, In Ho,Lee, Sun Yeong 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.5

The tonnage of copper and tungsten produced at Dalseong mine by Taehan Tungsten Mining Company from 1961 to 1971 was 48,704 tons (M/T) of 4 wt.% Cu and 1,620 tons (S/T) of 70wt.% WO, but the mine was closed in 1974. Kyeongsan mine is a small abandoned cobalt mine with no data of production. To investigate the pollution level of the mine areas, soils, plants (Ohwi and Pampanini), stream waters and stream sediments were taken and Fe, Mn, Cu, Pb, Zn, Ni, Co, Cd and Cr were analysed by ICP. Soils are considerably contaminated by the heavy metals related to ore deposits, The heavy metal contents in plants vary with the species and parts of plants. Stream waters are anomalously high in heavy metals in the vicinity of the mines but the contents decrease downstream in the process of dilution and precipiation. However, heavy metal contents increase very high in stream sediments due to precipiation. To protect environmental damages caused by acid mine drainages wetlands must be constructed outside pits, and it is necessary to fill pits with waters, limestone chips and organic materials, which give reducing and alkaline condition to ores. Under the condition pyrite is protected from oxidation and aqueous iron sulphates precipitate to form stable secondary pyrite.

경상분지내 열수광상의 광화작용과 백악기 화강암류의 화학성분 변화와의 관계

이재영,이진국,이인호,김상욱,Lee, Jae Yeong,Lee, Jin Kook,Lee, In Ho,Kim, Sang Wook 대한자원환경지질학회 1994 자원환경지질 Vol.27 No.4

The Cretaceous granitic rocks show differences in rock types and chemical compositions according to metallogenic provinces of copper, lead zinc and molybdenum in the Gyeongsang basin. Jindong granites are of granodiorite~quartz diorite~diorite in Cu-province; Makeunsan/Yucheon-Eonyang granites, granodiorite~granite in Pb Zn-province; Onjeongri-Yeonghae granites, granodiorite~quartz diorite in Mo-province, and there is a trend that productive masses are less differenciated than barren masses in Cu and Pb-Zn provinces whereas productive masses are more differenciated than barren masses in Mo province. Metallogenic provinces are distinguishable by variations of major and trace elements. The Cretaceous granitic rocks are highest in the content of Ca, Mg and other basic major elements and lowest in the content of K and Na in Cu provicne; the variation trends are vice versa in Pb-Zn province. Trace elements such as Rb and Sr show variations related to K and Ca, and metallogenic provinces are also distinguishable by their ratios. The granitic rocks of Mo province have intermediate content of major and trace elements, but are clearly distinguishable from Jindong granites and partly overlapped by Yucheon-Eonyang granites. Chlorine content in biotites is higher in a productive mass than in a barren mass in Cu province. Therefore, the mineralogical and chemical compositions are applicable as geochemical index to distinguish the types of mineralizaion, and productive and barren masses of the Cretaceous granitic rocks in the Gyeongsang basin.

경북지역 폐금속광산이 환경에 미치는 영향

이재영,김종근,이인호,이진국,Lee, Jae Yeong,Kim, Jong Gun,Lee, In Ho,Lee, Jin Kook 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.4

The heavy metal contents are more abundant in stream waters, paddy soils and rice plants in the vicinity of abandoned mines compared to the surrounding areas in the Kyungpook province. However, these contents tend to decrease with distance from mines, and show some variation under different geological and geochemical environments. The Sin-stream waters have high contents of Cu=4.9 ppm, Pb=0.1 ppm, Zn=3.5 ppm and other heavy metals (Ni, Co, Cd) at Dalsung abandoned mine and low contents of Cu=0.4 ppm, Pb=0.1 ppm, Zn=0.1 ppm and other metals= 0.002 ppm in the surrounding area. The high contents decrease in the downstream in the area of calcareous sedimentary rocks. The paddy soils have high contents of approximately Cu=51 ppm, Pb=83 ppm, Zn=211 ppm, and Cd=11.3 ppm in the vicinity of Gunwi abandoned mine but low contents of Cu=4.5 ppm, Pb=2.9 ppm, Zn=60 ppm and Cd=0.4 ppm in the surrounding area. The Dadeog abandoned mine also shows similar trends to Gunwi mine. The contents of heavy metals of rice plants are high in the roots but trends to decrease through stem+leaf and become low in brown rices.

경상분지내 동광상 관련 진동화강암류에 대한 지화학적 연구

이재영,이진국,박법정,이인호,김상욱,Lee, Jae Yeong,Lee, Jin Kook,Park, Beob Jeong,Lee, In Ho,Kim, Sang Wook 대한자원환경지질학회 1994 자원환경지질 Vol.27 No.2

Jindong Granites are plotted mainly in the region of granodiorite~diorite of the Streckeisen's diagram, while Yucheon-Eonyang Granites and Onjonri Granites in the region of monzo-granite and monzo-granite~granodiorite, respectively. Jindong Granites show a differenciation trend of calc-alkaline magma, and its magmatic evolution from intermediate to acidic rocks, which might form mineralizing solution, is consistant with the general path of the Cretaceous granitic rocks including Yucheon-Eonyang Granites and Onjongri Granites. The differenciation index (D.I.) is 35~80 for Jindong Granites, which is lower than 85~95 of Yucheon-Eonyang Granites and is partly overlapped by 67~84 of Onjongri Granites. There is clear difference in content of some major and trace elements between Jindong Granites of Cu province and the other granitic rocks of Pb-Zn and Mo provinces. Between these metallogenic provicnes, Cu content is high in Jindong Granites near Haman-Gunbuk mineralized zone, while Pb and Zn are relatively abundant in Yucheon-Eonyang Granites and Mo in Onjongri Granites. Therefore, Jindong Granites of the Cu province are distinguishable by chemical compositions and their related geochemical characteristics from the other Cretaceous granitic rocks of Pb-Zn and Mo provinces. However, the content of Cu and Cl in biotite is applicable to distinguish a productive phase from a barren phase of Jindong Granites, because Cu and Cl show a trend to be concentrated in biotite of Jindong Gratites in the Haman-Gunbuk mineralized zone.

천연 제올라이트 / 에폭시 복합재료의 경화반응 속도론

이재영,천인숙,심미자,김상욱 ( Jae Young Lee,In Sook Chun,Mi Ja Shim,Sang Wook Kim ) 한국공업화학회 1996 공업화학 Vol.7 No.2

천연 제올라이트/에폭시 수지 복합재료의 경화반응 속도론을 연구하기 위해 DSC 분석법 중 승온적 방법을 이용하였다. 천연 제올라이트의 함량이 증가함에 따라 반응 시작온도와 발열피크의 온도가 낮아졌다. Diglycidyl ether of bisphenol A(DGEBA)/4,4`-methylene dianiline(MDA)/malononitrile(MN, 10phr)에 제올라이트를 20phr 충전한 경우에는 하나의 발열피크가 나타나며, 30phr인 경우에는 shoulder가 나타났다. 40phr의 제올라이트가 충전된 경우에는 발열피크가 두 개로 분리되며, 첫번째 발열피크의 활성화에너지, Ea₁은 12.30 kJ/㏖이고, 두번째 발열피크의 활성화에너지, Ea₂는 12.70 kJ/㏖이었다. Natural zeolite/epoxy resin composites were prepared and the cure kinetics was studied by dynamic DSC analysis. With the increment of natural zeolite content, the reaction starting temperature and the exothermic peak temperature were decreased. When diglycidyl ether of bisphenol A(DGEBA)/4,4`-methylene dianiline(MDA)/ malononitrile(MN, 10phr) was filled with 20phr of zeolite, DSC thermogram had one peak and when it was filled with 30phr of zeolite, a shoulder appeared on the DSC thermogram. With the filling of 40phr of zeolite, DSC thermogram was separated into two peaks and the activation energy of the first peak, Ea₁ was 12.30 kJ/㏖ and that of the second peak, Ea₂ was 12.70 kJ/㏖.

건설 노동자의 폭염으로 인한 온열질환 증상의 경험과 심리적 특성

이재영,이승수,Lee, Jae Young,Lee, Sungsu 한국재난정보학회 2020 한국재난정보학회 논문집 Vol.16 No.4

연구목적: 본 연구는 폭염으로 인한 유사 환경 조건이라도 개인의 내적 특성에 따라 다른 대처를 하게 되어 피해의 정도에 개인차가 있음을 주목하였다. 이에 개인의 심리적 특성과 온열질환 증상 경험의 영향 관계를 분석하였다. 연구방법: 건설노동자를 대상으로 온열질환 증상의 경험 유무에 따라 개인특성의 설문과 폭염 피해에 연관성이 있을 강박신념, 자아 존중감, 성격에 대한 심리척도를 통해 영향관계를 분석하였다. 연구결과: 로지스틱 회귀분석 결과, 책임감은 온열질환 증상의 경험에 정(+)의 영향, 집단에서의 자아 존중감은 온열질환 증상의 경험에 음(-)의 영향을 미치는 것으로 나타났다. 결론: 본 연구는 폭염으로 인한 피해자의 심리적 특성을 파악하기 위하여 폭염에 취약한 대상인 건설노동자를 대상으로 강박신념, 자아 존중감, 성격을 분석한 첫 번째 연구로 기초자료를 제시하였다. Purpose: This study noted that even similar environmental conditions caused by the heat wave were differentiated depending on the internal characteristics of the individual, so there was a difference in the extent of the damage. Thus, the relationship between individual psychological characteristics and experiences of the symptoms of thermal diseases was analyzed. Method: The influence of construction workers was analyzed through questioning of individual characteristics and psychological measures of self-esteem, self-esteem, and personality that may be related to heat wave damage, depending on whether they have experienced symptoms of thermal diseases. Results: Logistic regression shows that responsibility affects positive (+) experience of symptoms of heat disease and self-esteem in groups negatively (-) experience of symptoms of heat illness. Conclusion: This study presented basic data as the first study to analyze obsessive compulsive, self-respect and personality of construction workers who are vulnerable to heat waves to identify the psychological characteristics of victims of heat waves.

연구논문 - 고분자공업분과 : TG 분석에 의한 DGEBA / MDA / MDA - endcapped CTBN 계의 열분해 특성

이재영,최형기,심미자,김상욱 ( J . Y . Lee,H . K . Choi,M . J . Shim,S . W . Kim ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1994 No.1

인상채득방법과 방향에 따른 인상체의 정밀성과 체적 안정성에 관한 연구

이재영,임주환,조인호,Lee, Jae-Young,Lim, Ju-Hwan,Cho, In-Ho 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.5

Accurate reproduction of intraoral tissue is essential in the fabrication of fixed prosthesis. This selection of impression material and method is very important. In this study, vinyl polysiloxane type impression material $Panasil^{(R)}$ was used. Three impression methods ; one-step technique, individual tray technique, and individual tooth tray technique using the vinyl polysiloxane type bite registration material $Futar^{(R)}$ Occlusion, were used to take horizontal and vertical impression. Improved stone models were fabricated. The amount of occlusal surface discrepaneies, interabutment distance discrepancies, amount of marginal defect were evaluated with the $X-PLAN360d^{(R)}$ and photoscanning. The results were as follows. 1. There was no significant difference in occlusal surface according to the directions and techniques of impression taking. 2. There was no significant difference in interabutment distance discrepancies according to the directions and techniques of impression taking 3. There was no significant difference in marginal discrepancies according to the direction of impression taking but there was significant difference between one-step technique and individual tray technique, individual tooth tray technique (P<0.05). Taken together, these results suggest that individual tray technique and individual tooth tray technique are more accurate for impression taking than one-step technique.

DSC 분석에 의한 DGEBA / MDA / GN / HQ 계의 경화반응 속도론

이재영,심미자,김상옥 ( J . Y . Lee,M . J . Shim,S . W . Kim ) 한국공업화학회 1994 공업화학 Vol.5 No.5

촉매로 작용하는 HQ의 첨가에 따른 DGEBA/MDA/GN계의 경화반응 속도론 변화를 Kissinger equation과 Fractional life법에 의해 연구하였다. HQ가 첨가된 계가 첨가되지 않은 계보다 활성화 에너지는 약간 감소하였고, pre-exponential factor 값은 30% 정도 증가하였다. 그리고, HQ(1.25phr)가 첨가됨으로 인해 반응속도는 1.8배 정도 증가하였다. Cure kinetics of DGEBA(diglycidyl ether of bisphenol A)/MDA(4,4`-methylene dianiline)/GN(glutaronitrile) system with and without HQ(hydroquinone) as a catalyst was studied by Kissinger equation and Fractional life method. The activation energy of the system with HQ was somewhat lower and the pre-exponential factor of that was higher by about 30% than those of the system without HQ. As 1.25phr of HQ was added, reaction rates increased about 1.8 times.