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忠南大學校 綜合캠퍼스 細部施設計劃 : 農學館, 人文串 및 基礎科學館을 中心으로
李昌甲,任洪彬,朴萬植,權五憲,李殷雄,李遠勳 충남대학교 공업교육연구소 1978 論文集 Vol.1 No.1
Systematic approach for the campus planning and the facility programming has been already developed and widely employed. This approach was principally applied to this program. This program was intended to suggest the guidance for the construction works of the Agricultural Bldg., Liberal Arts Bldg. and Basic Science Bldg. of Chung Nam National University in terms of facility requirements and allocated spaces based upon curricula analysis and unit plan. The results were reviewed and compared with the criteria and allowance per capita of foreign countries and showed to be in use with highly intensive cycle.
Hong, S.,Yim, U.H.,Ha, S.Y.,Shim, W.J.,Jeon, S.,Lee, S.,Kim, C.,Choi, K.,Jung, J.,Giesy, J.P.,Khim, J.S. Pergamon Press 2016 CHEMOSPHERE - Vol.144 No.-
Bioaccessibility of toxic substances in sedimentary residual oil is a crucial factor that needs to be considered for accurate risk assessments posed by oil spills. However, information on oil weathering processes and bioaccessibility of residual oil is often not sufficient and clear. In the present study, bioaccessibility of aryl hydrocarbon receptor (AhR)-active polycyclic aromatic hydrocarbons (PAHs) in coastal sediments near the site of the Hebei Spirit oil spill (Korea, 2007) was assessed by Tenax extraction in effect-directed analysis (EDA). Sediment samples collected 6 years after the oil spill were extracted using Soxhlet or Tenax, and EDA was performed using a battery of H4IIE-luc bioassay and GC/MSD analysis. Concentrations of PAHs and alkyl-PAHs in Soxhlet extracts ranged from 210 to 53,000 μg kg<SUP>-1</SUP> dry mass. However, concentrations of PAHs and alkyl-PAHs in Tenax extracts were approximately 20-fold less compared to those in Soxhlet extracts. In Soxhlet and Tenax extracts, the major AhR-active PAHs were identified as C1-chrysene, C3-chrysene, and C4-phenanthrene. Concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) equivalents (TEQ<SUB>PAHs</SUB>) explained 31% and 60% of the bioassay-derived TCDD-EQ concentrations in Soxhlet and Tenax extracts, respectively. Overall, bioaccessibility of PAHs and alkyl-PAHs in sedimentary residual oils depended on hydrophobicity (log K<SUB>ow</SUB>) and degree of weathering of crude oil. The results of the present study provide further evidence in support of the biological and ecological recoveries of oil spill sites.
Marine Environmental Emergencies in the North Pacific Ocean: Lessons Learned from Recent Oil Spills
Yim, U. H.,Short, J. Springer Science + Business Media 2017 Archives of environmental contamination and toxico Vol.73 No.1
<P>Increasing marine vessel traffic, and oil and gas exploration and development throughout the North Pacific basin brings increasing risks of oil spills. Recognizing the serious challenges presented to response authorities, this Special Issue was organized by the North Pacific Marine Science Organization to provide an introduction to the current state of scientific understanding regarding the environmental effects of oil spills. Because interactions of spilled oils with biota and their habitats are complex, the most serious environmental damages from these spills are not necessarily those of greatest immediate concern by the public. Our overarching goal for this Special Issue is to provide an efficient introduction to the most important ways that oil spills can harm biota, habitats, and ecosystems through invited, targeted mini-reviews augmented by original research articles. We provide a brief background on the challenges posed by large oil spills to response authorities, summarize findings from the articles published in this Special Issue, and highlight some key research needs.</P>
Environmental Impacts and Recovery After the Hebei Spirit Oil Spill in Korea
Yim, U. H.,Khim, J. S.,Kim, M.,Jung, J. H.,Shim, W. J. Springer Science + Business Media 2017 Archives of environmental contamination and toxico Vol.73 No.1
<P>The Hebei Spirit oil spill (HSOS) on December 7, 2007 was the worst oil spill recorded in Korea, with the release of approximately 10,900 tons of crude oil and 375 km of coastline polluted along the west coast of Korea. Cleanup operation was conducted by official and contract responders as well as volunteers for massive oil containment and removal of heavy accumulations of stranded oil. Together with the oil cleanup, a long-term environmental impact assessment (EIA) of the HSOS was initiated based on the Marine Environmental Management Act, which covers oil contamination in a multimedia environment, toxic effects on organisms, and ecosystem injury. This review summarizes the long-term monitoring results of HSOS EIA focused on (1) pollution status of seawater, sediment, and bivalves, (2) ecotoxicological effects, and (3) ecosystem recovery. Overall, concentrations of petroleum hydrocarbons in the environment indicated that their concentrations were well down to at or near background or pre-spill contamination levels at most sites after 1 year. The potential toxic effects of residual oils in sediments have decreased to background levels in most coastal areas of Taean. The entire ecosystem in the most affected area of the Taean coasts appear to be considerably, but not fully, recovered at present, namely after 8 years of the HSOS. The presence of lingering oil and elevated contamination levels at several sites still require continuous long-term monitoring.</P>
Fingerprint and weathering characteristics of stranded oils after the Hebei Spirit oil spill
Yim, U.H.,Ha, S.Y.,An, J.G.,Won, J.H.,Han, G.M.,Hong, S.H.,Kim, M.,Jung, J.H.,Shim, W.J. Elsevier Scientific Pub. Co 2011 Journal of hazardous materials Vol.197 No.-
After the Hebei Spirit oil spill in December 2007, mixtures of three types of Middle East crude oil were stranded along 375km of coastline in Western Korea. Stranded oils were monitored for their identity and weathering status in 19 stations in three provinces. The results obtained using a weathering model indicated that evaporation would be a dominant weathering process immediately after the spill and the sequential changes of chemical composition in the field verified this prediction positively. In the early stages of weathering, the half-life of spilled oil was calculated to be 2.6 months. Tiered fingerprinting approaches identified background contamination and confirmed the identity of the stranded oils with the spill source. Double ratios using alkylated phenanthrenes and dibenzothiophenes in samples after the spill clearly reveal the impact of weathering on oil. However, to derive defensible fingerprinting for source identification and allocation, recalcitrant biomarkers are extremely useful. Weathering status of the stranded oils was evaluated using composition profiles of saturated hydrocarbons, polycyclic aromatic hydrocarbons and various weathering indices. Most samples collected 8 months after the spill were categorized in either the advanced or extreme weathering states. Gradual increase in toxic components in the residual oil through weathering emphasizes the need for adaptive ecotoxicological approaches.
Optical characteristics of In(Ga)As quantum dots on (100) InP substrate for 1.5μm laser diodes
Yim, J.S.,Lee, J.H.,Jang, Y.D.,Kim, M.D.,Lee, D.,Kim, H.D.,Pyun, S.H.,Jeong, W.G.,Kim, J.S.,Hong, S.U.,Oh, D.K. Elsevier 2005 Microelectronics Journal Vol.36 No.3-6
<P><B>Abstract</B></P><P>We report on round quantum dots grown on InP (100) substrate, which emit around 1.55μm. At 10K the full width at half maximum is as small as 28meV, attesting a rather uniform size distribution. The carrier lifetimes are almost the same across the whole photoluminescence band, indicating the good isolation of quantum dots. Continuous-wave lasings are observed at room temperature from laser diodes made of these quantum dots.</P>
임홍재(H.J.Yim),이호용(H.Y.Lee),최동운(D.U.Choi),박재건(J.K.Park),권성은(S.Y.Koun),이명식(M.S.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
A section analysis and design program named SECOPT has been developed to compute cross section properties of general thin-walled open, close, single, or multi-cellular sections. SECOPT, a program developed especially to help designers of vehicle structures where non-standard geometrical shape of beam section are encountered. The program integrates optimization of beam section with automatic calculations and satisfaction of constraints on section properties. The section optimization function of SECOPT provides with the ability to design minimum weight sections that meet a specified set of constrains on moment of inertias and torsional constant.<br/>