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- 저자 : 김성국(Sung Kuk Kim) (검색결과 109 건)
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김성국,박상원,Kim, Sung-Kuk,Park, Sang-Won 한국지하수토양환경학회 2004 지하수토양환경 Vol.9 No.2
Chlorinated and nitroaromatic compounds are non-degradable substances that are extremely toxic and are known to be carcinogens and mutation causing agents. Moreover, the half-lives of substances such as carbon tetrachloride, hexachloroethane and nitroaromatic compounds are several decades. In this study, the optimal conditions to detoxify chlorinated compounds by the reductive degradation were investigated. The following results were obtained in the reductive degradation of CCl$_4$, C$_2$Cl$\_$6/, C$_2$HCl$\_$5/, C$_2$Cl$_4$, and C$_2$HCl$\_$5/ by using Fe, FeS and FeS$_2$ as mediators. CCl$_4$ was reduced to CH$_2$Cl$_3$ and CH$_2$Cl$_2$in anaerobic conditions when FeS was used as a mediator. While the reduction of CCl$_4$ to CHCl$_3$ was rapidly proceeded, the reduction of CHCl$_3$ to CH$_2$Cl$_2$ was occurred slowly. Further reduction to CH$_3$Cl was not observed. Unlike CCl$_4$, C$_2$Cl$\_$6/ was degraded to C$_2$HCl$\_$5/, C$_2$Cl$_4$. C$_2$HCl$_3$ and cis-1,2-C$_2$H$_2$Cl$_2$ by complicated pathways such as hydrogenolysis, dehalo-elimination and dehydrohalogenation. A small amount of C$_2$HCl$\_$5/ was detected only in the early stages of the reduction. However, majority of the C$_2$Cl$\_$6/ was reduced to C$_2$Cl$_4$. cis-1,2-C$_2$H$_2$C1$_2$ was the only product among other possible isomers. 염소계 및 니트로계 유기 화합물은 발암물질 또는 돌연 변이성 유발물질로 인체에 매우 유독한 물질로 알려 져있다. 특히 사염화탄소,헥사클로로에탄 또는 니트로계 방향족 화합물은 자연계에서 분해되는 반감기는 수십 년이 걸린다. 이 연구에서는 염소계 유기화합물의 환원적 분해반응으로 무독화하는 것을 목적으로 한다. Fe$^{0}$ , FeS와 FeS$_2$를 반응 매개물로 이용해서 $CCl_4$, $C_2$Cl$_{6}$, $C_2$HCl$_{5}$ , $C_2$Cl$_{4}$와 $C_2$HCl$_3$의 환원적 분해반응에서 다음과 같은 결과를 얻었다. $CCl_4$ 는 FeS을 반응 매개물로 혐기성 조건에서 CHCl$_3$와 CH$_2$Cl$_2$로 환원적 분해반응을 하였다. $CCl_4$에서 CHCl$_3$으로 환원반응은 매우 빠르게 일어나는 반면 CHCl$_3$에서 CH$_2$Cl$_2$로 분해되는 반응속도는 매우 느리게 일어났다. $C_2$Cl$_{6}$는 $CCl_4$와 달리 복잡한 반응 경로로 환원적 분해 반응을 하였으며, 수소첨가 반응, 탈염소제거반응과 탈수소탈염소화반응으로 $C_2$HCl$_{5}$ , $C_2$Cl$_4$, $C_2$HCl$_3$와 cis-1,2-C$_2$H$_2$Cl$_2$의 환원 생성물로 분해되었다. 반응 초기에 소량의 $C_2$HCl$_{5}$ 생성물이 확인되었으며, 대부분 $C_2$HCl$_4$으로 환원반응 하였다. 특히 $C_2$HCl$_3$에서 환원반응 생성물로 cis-1,2C$_2$HCl$_2$만이 생성물로 나타났고, trans-1,2-C$_2$H$_2$Cl$_2$ 또는 1,1-C$_2$H$_2$Cl$_2$은 생성물로 나타나지 않았다.
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김성국,Kim, Sung-Kuk 해양환경안전학회 2015 해양환경안전학회지 Vol.21 No.6
무역장벽의 일종인 카보타지는 자국내 내항해운업을 보호하여 왔다. 자국에서 건조한 선박으로 자국 선원이 승선하여 자국의 화물을 운송한다는 카보타지를 운영한 미국은 조선산업과 해운 연관산업이 유지되어 왔다. 그리고 대부분의 국가는 경제적 이유와 유사시 대처라는 이유 때문에 자국적 선박을 통해 저탄소 운송인 내항해운을 담당하는 카보타지를 운영하고 있다. 카보타지를 유지하기 위해서는 선원의 안정적인 공급이 필요하다. 선원의 안정적인 공급은 선원양성 교육기관의 안정적인 운영에 달려있기 때문에 법률적인 검토가 필요하다. 본 연구에서는 내항해운의 안정적 선원공급을 통한 카보타지 확립에 관련하여 우리나라 내항해운의 문제점과 선원 실태를 분석하였다. 분석결과 미국과 같은 선원양성에 관련한 법률을 제정하거나 정비할 필요가 있음을 확인하였다. The cabotage rule has been protecting the domestic industry from foreign competitions as a kind of trade barrier. In the United States, the shipbuilding industry has been maintained with the help of to the strict cabotage operations by reinforcing advantages for domestic crews and ships which are built in the U.S. For most countries, cabotage has been granted legitimacy in their coastal shipping by Low Carbon Transport in terms of economic and emergency reasons. The cabotage rule is required in the stable supply of the seafarers which rely on the legitimate maritime education. This study analyzes Korean cabotage system and the problems with regard to seafarers education. It is found that the resolution is set up the cabotage act such as Jones Act, U.S.
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철 광물에 의한 헥사클로에탄의 환원적 분해: 반응 속도 연구
김성국,박상원,Kim, Sung-Kuk,Park, Sang-Won 한국지하수토양환경학회 2004 지하수토양환경 Vol.9 No.2
수용액상에서 철광물질과 유기 용매간의 반응 속도는 여러 반응인자에 따라 반응 속도 실험을 하였다 F $e^{0}$ , FeS와 Fe $S_2$를 반응 매개물로 $C_2$C $l_{6}$에 대한 반응에서 F $e^{0}$ > FeS > Fe $S_2$ 순으로 분해반응 속도가 빠르게 나타났다. 철 광물질에 대해서 $C_2$C $l_{6}$, CHC $l_{5}$ , $C_2$C $l_4$, CHC $l_3$에 대한 분해 반응 속도는 염소 치환기가 적을수록 환원반응 속도는 느리게 일어난다. 환원 반응 속도는 pH, 교반 속도, 반응 온도와 비표면적에 의존적임을 확인하였다. 1,10-phenanthroline과 EDTA화합물은 고립전자 쌍을 가진 2개의 질소 원자에 의해 형성된 두 자리 킬레이트 작용기가 철 표면에 흡착하며 전자 이동 속도를 증가시켜 분해 반응 속도를 증가시킨다. 즉 분자 $\pi$* 오비탈을 가진 질소원자는 비어있는 금속에 비편재(delocalized)되어 전자이동 속도를 증가시킨다. 그리고 hydroquinone은 반응 속도에 영향을 주지 않았다. 자연계에 존재하는 카올리나이트는 철 광물질의 부식을 유발시켜 분해 반응속도를 증가시켰다. 반면 F $e^{2+}$와 S $O_4$$^{2-}$ 와 같은 이온은 반응속도에 영향을 주지 않았다. Kinetic characteristics dependent on several factors such as iron mineral and organic solvents were investigated. When F $e^{0}$ , FeS and Fe $S_2$ were used as mediators, minerals affecting reaction rate were in the following order : $Fe_{0}$ 0/ > FeS > $FeS_2$ when in contact $C_2$C $l_{6}$ . The more chloride substituted, the higher reaction rate were observed. The reaction rates were dependent on pH, shaking rate, temperature and specific surface area. 1, 10-phenanthroline and EDTA degradation rates were fast, indicating that they adsorbed on the surface of the iron which makes the electron transfer reaction easy. Nitrate which has $\pi$* orbital of molecular can increase electron transfer rate because it is delocalized in its entity. The reaction rates were not affected by hydroquinone. Degradation rates were much enhanced with naturally occurring kaolinite because of the surface corrosion of Fe mineral. However, The reaction rate was not affected by F $e^{2+}$ or S $O_4$$^{2-}$ presented in solution.n.
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사회연결망분석(SNA)을 이용한 韓中日 Ferry 항로 분석에 관한 연구
김성국(Sung Kuk Kim) 한국해양비즈니스학회 2015 해양비즈니스 Vol.- No.32
While demand for international ferry transport in Asia has been increasing, some challenges have been recognized such as lack of design and rule standard for port facility, regarding international ferry transport between Korea, Japan and China. The purpose of this study is to find port network of coastal passenger service. Social Network Analysis is utilized to meet the conditions for this aim. This paper will carry out visualization to show the graphical representation of port network of coastal passenger services. This paper discusses the relationship of Korea, Japan and China ports by applying network analyses such as degree centrality measures, closeness centrality. The results of this paper showed Incheon Port has the highest closeness centrality as well as Busan Port indicates the highest degree centrality. The Cabotage has been becoming more important because regional economic zones in Northeast Asia are connected closely. With the increase of cargo flow between China and Japan in the near future the RoRo Ferry hub port such as Incheon and Busan port should focuses on efficiency of cargo flows.
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김성국(Sung kuk Kim),장세은(Se Eun Jhang) 한국해양비즈니스학회 2016 해양비즈니스 Vol.- No.34
Cruise tourism is a new leading tourism trend in Northeast Asia. The recent growth in recent years is attributed to the increasing cruise ships that have ports of calls such as South Korea, China, and Japan. According to this rapid growth cruise in terms of its volume and passenger numbers, South Korean government has planned the initiative project for development of the cruise industry. It is important to supply skilled workers in this industry because the human element is one of the most important variables for the industry. Thus, it is essential to provide cruise ship industry education and training hotel service skills and on board skill which requires training and supply of cruise industry professionals. In this paper, we review the expertise of professional manpower needs of the cruise ship operations and supply measures necessary for the cruise industry. If supplied a right time for cruise industry professionals, the Korean cruise industry will contribute to adequately supplying the human capital to develop the cruise industry in Korea.
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김성국(Sung-Kuk Kim) 한국해양비즈니스학회 2008 해양비즈니스 Vol.- No.11
The purpose of this study was to identify the representative consumer behaviors of water leisure sports. Form the in-dept review of literature using Q-Methodology to find the water leisure sports consumer types. Through the Q factor analysis, three distinct consumer behavior types were identified.<BR> And form the results of the analysis, 34 items were selected among 30 Q sample. Multidimensional scaling and discriminant function analysis showed that all three factors were correctly classified into their respective types; (1) "Social intercourse-oriented", (2) "Family-oriented", (3) "Self improvement". The result indicated that the scale could be used as a valid and reliable instrument to classify consumer behaviors type. Based on these results, the directions for future research were discussed.
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