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이성식,강봉근,김종화 ( Sung Sik Lee,Bong Geun Kang,Jong Hwa Kim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
Fly ash as industrial waste can be divided into coal fly ash and heavy oil fly ash. Since the fly ash contains lots of metallic oxides, it can be treated as a second resource from which various valuable metals may be separated, recovered and refined. The leachants of fly ash are hydrochloric acid, sulfuric acid and water. The heavy oil fly ash contains a high concentration of Ni, V, Ga and so on, while the leaching solution from coal fly ash has poorer contents of soluble metal ions than the heavy oil fly ash. Before the recovery, the adsorption or ion exchange method was used as pre-treatment. For an efficient leaching, two steps were taken to prevent any disturbance from other metal ions. Such extractants as LIX51, TBP(100%), TOPO, TOMAC and D2EHPA were used in order to separate, recover and refine Ga and V from the leaching solution. Gallium was extracted as much as nearly 100% at the concentration of 2 M-HCl when used to the concentration of 0.1 M TOMAC as extractant, and the extraction of Fe(III) showed a similar tendency. The selective extraction of Ga could be proceeded after Na₂S two times as much as Fe equivalent was added to aqueous solution. The refinement by way of vanadium extraction appeared in the order of TOMAC>DP-8R>LIX51 at the range of pH 0-3. The precipitation of co-existent iron ions from raffinate could be removed by controlling pH at 3 or higher.
이성식 ( Seong Sik Lee ),강은영 ( Eun Young Kang ),최수형 ( Soo Hyung Choi ) 대한범죄학회 2015 한국범죄학 Vol.9 No.2
이 연구는 청소년들의 스마트폰 이용의 증가로 인한 스마트폰중독의 부작용으로 그것이 스마트폰 이용상 사이버비행의 가해와 피해에 얼마나 영향을 미치는지를 살펴보고자 했다. 스마트폰중독의 원인으로는 우울, 낮은 자기통제력, 자긍심 및 부모, 학업, 친구관계에서의 긴장을 제시하고 이 요인들과 무엇보다 스마트폰중독이 사이버비행의 가해와 피해에 영향을 미치는지의 연구모형을 구성하고, 경기도 303명의 초, 중, 고등학생 남녀 청소년을 대상으로 조사한 자료를 Lisrel 분석을 통해 검증하였다. 이 연구에서는 스마트폰중독의 원인으로 낮은 자기통제력과 학업긴장이 중요하다는 결과를 나타냈다. 그리고 스마트폰중독은 스마트폰 이용상 사이버비행의 가해에 영향을 주지는 않았지만 사이버비행의 피해에는 유의미한 영향력을 갖는다는 결과를 제시했다. 아울러 부모긴장과 학업긴장은 스마트폰 이용상 사이버비행피해에 직접적인 영향력을 갖기도 했다. 그 결과를 통해 기존 인터넷중독에서의 결과와 비교하고 대책방안을 모색한다. This study tests whether smart phone addiction has an influence on both cyber delinquent offending and victimization. In addition, this study explores causes of smart phone addiction such as depression, low self-control, self-esteem, and strains in each family, school, peer relationships, constructs a structural causal model and tests it. Using data 303 elementary, middle, and high school students in Kyunggi area, results show that low self-control and strains in school have significant influence on smart phone addiction. Results also reveal that smart phone addiction has a significant effect on cyber victimization, even though it has no significant effect on cyber offending. In addition, parental and school strain have direct effects on cyber delinquent victimization. Those results are compared with the case of internet addiction and policy implications are discussed.
산 침출액에서 EHPNA 에 의한 코발트와 니켈 금속 이온의 추출평형
이성식(Sung Sik Lee),전성균(Sung Kyun Jeon),양종규(Jong Gyu Yang),강봉근(Bong Geun Kang) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.3
Extraction equilibrium formulations were studied for the distribution coefficient of cobalt and nickel ions from acidic leach solutions by using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester(EHPNA) dissolved in n-heptane at 298。K. The extration equilibrium constants, K_(ex) of cobalt and nickel by EHPNA were investigated and they were different from each other that by DEHPA. Complex form of cobalt and nickel in the organic phase was CoR₂·2HR, NiR₂·4HR. With metal extraction processes, considering that the activity is one of the basic parameters in characterizing the solution itself, the mean activity coefficients of solutes, γ_±[Co(NO₃)₂], γ_±[Ni(NO₃)₂], γ_±(HCl), γ_±(H₂SO₄) in aqueous mixed electrolyte solutions were calculated by Mckay-Perring method and its modified form using the equi-water activity data of those solutions experimentally determined. The mean activity coefficients had an effect on extraction curve and experimental results agreed with well those calculated by Modified Mckay-Perring method on extraction profiles except at low acid concentrations.
이성식 ( Seong Sik Lee ),강은영 ( Eun Young Kang ),정유현 ( Yoo Hyun Jung ) 대한범죄학회 2007 한국범죄학 Vol.1 No.1
약물남용은 최근 주요 사회문제 중 하나이다. 이 연구는 현재 약물사범이 어떠한 처우를 받고 있는지의 실태와 처우의 만족도, 그리고 아울러 약물중단을 예측하는 치료요소가 무엇인지를 경험연구를 통해 살펴봄으로써 효과적인재활 및 치료방안을 모색하려는 것에 주목한다. 2005년도 672명의 약물사범을 대상으로 조사한 결과에 따르면, 약물사범에게 전문적인 처우가 실시되지않음을 발견했으나, 약물사범들은 전문치료요소에 더 만족하고 또 전문치료가 필요하다는 응답을 제시했다. 사회내처우 약물사범의 경우는 사회적 지지나 치료공동체 요소인 상호지지가, 시설내처우 약물사범의 경우는 취업이나 치료에 있어서 가족참여가 약물중단에 기여할 수 있다는 결과를 제시했으며, 심리사회요소들로는 우울이나 자긍심, 약물태도, 자기통제력 등의 요소가 약물중단과 관계가 없었던 반면, 약물로 결과되는 손실인지도는 약물중단을 예측하는 주요 요인으로 나타났다. Drug abuse has been considered one of the emerging major social problems. For developing an effective treatment strategy for drug abusers, this study examines the current treatment for drug abusers, their satisfaction with treatment, and the demand and types of treatment which they want. This study also finds effective treatment factors which can explain stop or desist from drug abuse. This study uses data from 326 drug-involved probationers and 346 drug inmates in 2005. It is shown that drug abusers are not currently treated by specialized programs, but satisfied with those treatments among the various programs, and also want to need more specialized treatment programs. This study finds that social supports or self-help/mutual support program would be effective for their recovery of drug-involved probationers and it is also shown that occupational training and participation of family members in treatment process would be effective for drug inmates. In addition, although some factors of psycho-social characteristics such as depression, self-esteem, pro-attitudes toward drug, and lower self-control, etc. do not explain drug abusers`` intention of cessation, results show that the perceived negative costs of drug abuse have the explanatory power to predict the perceived possibility of their cessation from drug abuse.