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김필근,박맹언,성규열,임성택,오설미,Kim, Pil-Geun,Park, Maeng-Eon,Sung, Kyu-Youl,Lim, Sung-Taek,Oh, Sul-Mi 대한자원환경지질학회 2009 자원환경지질 Vol.42 No.2
The distribution characteristics of heavy metals for surface sediments in east oceanic dumping area (EDA) and west oceanic dumping area (WDA) are evaluated by grain sizes, minerals, sedimentation rates and compositions of heavy metals. The mean grain sizes in EDA and WDA range from $7.95{\Phi}$ to $8.51{\Phi}$ and $7.42{\Phi}$ to $8.15{\Phi}$, respectively. These are mostly belonging to the M (mud) type. Minerals in the surface sediments consist of illite with chlorite, smectite, and kaolinite. Sedimentation rates estimated by $^{210}Pb$ method in EDA and WDA are 1.11 mm/yr$\sim$1.73 mm/yr and 1.87 mm/yr, respectively. According to the interrelationship, concentrations of Ni, Cu, Cr, and Zn are closely associated with mean grain size, Al, and Fe, whereas concentrations of Cd and Pb are poorly associated with ones. The enrichment factors of these elements are higher than 1.5, suggesting that the concentrations of Cd and Pb in the surface sediments are affected by anthropogenic sources. The $I_{geo}$-class numbers of Cd and Pb in the surface sediments are mostly classified in 2 to 4, showing moderate to strongly polluted. These numbers in EDA are higher than that of WDA, and the highest number is 4, indicative of the strongly polluted class. Our results show that the disposed wastes at EDA include mineralogical wastes, dredged materials from sewage disposals, and sludges from constructions having materials of WDA. The annual amount of oceanic dumping in EDA is double than that in WDA.
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김필근,성규열,박맹언,Kim, Pil-Geun,Sung, Kyu-Youl,Park, Maeng-Eon 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.4
This study aims to evaluate the mechanical-chemical stability of used coal ash blocks, for improving fishing grounds. The surface of weathered ash blocks in seawater showed a decrease in the Ca and an increase in the Mg contents, compared to that of fresh blocks. This result reflects the substitution of Ca by Mg in seawater. The compressive strengths of ash blocks submerged into seawater during 12 months ranged from 235.23 to $447.43\;kgf/cm^2$; this is higher than the standard strength of wave-absorbing blocks($180\;kgf/cm^2)$ that are used for harbor construction. In addition, the compressive strength of ash blocks tends to increase with increasing installation time in seawater. The result of leaching experiments on coal ash blocks by Korean Standard Leaching Test(KSLT) method showed that leached concentrations of most metals except Cr(that leached up to 50 ppb, approaching standard concentration) do not exceed the seawater quality standards. A long-term(112 days) heavy metal leaching test to analyze seawater without mixing-dilution also showed that the concentrations of leached heavy metals, except for Cu, under anaerobic conditions do not exceed the seawater quality standards. Accordingly, the use of coal ash blocks in marine environments appears to be safe from chemical and mechanical factors that decrease the efficiency of concrete. Also, leaching concentration of Cu seems to be stable by decrease of leaching concentration due to dilution of seawater.
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방오도료 용출수의 조피볼락과 알테미아에 대한 급성독성 평가
김필근,박맹언,이인원,전호환,박현,Kim, Pil-Geun,Park, Maeng-Eon,Lee, In-Won,Chun, Ho-Hwan,Park, Hyun 해양환경안전학회 2010 해양환경안전학회지 Vol.16 No.4
해양구조물 수중부의 해양생물 부착을 방지하는 효과적인 방법으로 방오도료를 사용하고 있다. 트리부틸틴(Tributyltin, TBT) 화합물은 우수한 방오성능을 가져 지금까지 광범위하게 사용해 되어 왔으나, 유해물질 사용금지에 따라 새로운 기술을 적용한 방오도료 개발이 진행되고 있다. 신규 방오도료는 낮은 독성을 가지면서도 우수한 방오성능을 가져야 한다. 본 논문에서는 상용 TBT-free 방오도료 3종(아산화동 함유 자기마모형 도료(Cu SPC AF), 아산화동을 함유하지 않는 자기마모형 도료(Cu-Free SPC AF), Foul-release 실리콘 도료(Foul release AF)의 용출수가 가지는 환경영향성을 조피볼락과 알테미아를 사용하여 평가하였다. 용출수에 대한 급성독성을 조사한 결과 방오도료 용출수의 농도와 생물종의 생존율은 반비례하는 경향을 나타내었으며, 자가마모형 도료가 Foul-release 실리콘 도료보다 상대적으로 높은 급성독성을 가지는 것을 확인할 수 있었다.
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배명우,방원석,김필근,박균열 국제인문사회연구학회 2024 Studies on Humanities and Social Sciences (SHSC) Vol.6 No.5
This study aims to analyze the life philosophy and leadership of the 1st Chief of Staff of the Navy, who is considered a symbol of military leadership. By examining his life history, we intend to analyze the life philosophy and leadership of the first Chief of Naval Operations, who is considered a symbol of military leadership, and present him as a role model of leadership, thereby finding a direction to lead the mental power that will become the foundation of a strong national defense force with the spirit of the second founding of the military. This study analyzed the life of Admiral Son Won-il, 1st Chief of Staff of the ROK Navy, from the perspectives of physical and cultural focus, life coping style, Admiral Son Won-il's values and vision, based on a chronological life history. As a leader with a pioneering spirit who loves his country and the sea, Son Won-il sets a firm goal and presents implications of leadership through his life story, in which he achieved it with his colleagues with great passion and conviction.
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