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대청호 수질오염 평가를 위한 부영양도 지수산정, 공간적 구배 특성 및 경험적 모델
권혁현 ( Hyuk Hyun Kwon ),안광국 ( Kwang Guk An ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9
The objectives of this study were to analyze reservoir trophic state, based on Trophic State Index (TSI), spatial variation patterns of three zones (riverine, transition, and lacustrine zone), and empirical models through 20-years long-term data analysis. Trophic variables of TP and CHL-a were highest during the summer monsoon, and decreased along the main axis from the riverine to lacustrine zone. In the mean time, TN did not show the trend. Ratios of N:P and Secchi disc transparency (SD) increased from the riverine to lacustrine zone. The analysis of trophic state index (TSI) showed that mean TSI (TP) and TSI (CHL-a) were 62 and 57, respectively, and these values were highest in the transition zone during the summer. This zone should be managed well due to highest lake water pollution. The analysis of Trophic State Index Deviation (TSID) showed that algal growth was primarily limited by light penetration, and this was most pronounced in the monsoon season. The analysis of empirical models showed that the value of R2, based on CHL-SD model, was 0.30 (p < 0.0001) in the transition zone and the R2, based on TP-SD model, was 0.41 (p < 0.0001) in the transition zone.
권혁일(Kwon Hyuk Il),한승훈(Han Seung Hoon) 한국퍼실리티매니지먼트학회 2016 한국퍼실리티매니지먼트학회지 Vol.11 No.1
Today, it is emphasizing that we should strive to improve structure s insulation and sealant. And the increasing of thermal efficiency bring about positive effect on environment protection and economic side. In this reseach, for making pleasant and healthy air, transform common electric precipitator into buliding electric precipitator. For efficiency evaluation of the building electric precipitator, we executed demonstration in nursery and steel mill office. Consequently, after installing machine in common nursery, we assure that decontamination fator rose in comparison with non-install spot. We set device up in steel mill office and operated too, the result turned out that it is helpful to decline fine dust despite unfavorable air condition of steel mill and the surrounding area.
보문 : 참당귀 추출물의 나노입자를 통한 피부 미백 효과 연구
권혁년 ( Hyuk Nyun Kwon ) 대한미용학회(구 대한미용과학회) 2014 대한미용학회지 Vol.10 No.3
Angelica gigas (AG) root extract is one of the most widely used herbal medicines in Asia and is known to have antioxidant activity and skin whitening effect. This study was carried out to evaluate skin-whitening effects of nanoparticles of AG root extract on cell penetration by comparison with AG root extract, and lecithin and cholesterol were used to encapsulate AG root extract to make nanoparticles. Nanoparticles were spherical liposomes by SEM (scanning electron microscope) and varied in size from a range of approximately 100~500 nm compared to 1,000~5,000 nm for ethanol extracts as measured by ELS (electrophotonetic light scattering spectrophotometer). Cell viability of the nanoparticles in NIH/3T3 fibroblasts was similar to that of the extract. Mushroom tyrosinase inhibition activity of nanoparticles was lower than the extract. Confocal fluorescence micrographs using fluorescent dye showed that the nanoparticles more effectively penetrated into NIH/3T3 fibroblasts than the ethanol extract with higher affinity and mobility to the cells. From these results, it is speculated that nanoparticles could be applied as additive in cosmetics.
5.16군사정부기 미 대한원조정책의 성격과 AID-유솜의 역할
권혁은(Kwon Hyuk-eun) 한국역사연구회 2017 역사와 현실 Vol.- No.105
Contrary to previous understanding, the U.S. policy of Korean aid was actually shifting during the Kennedy administration. The magnitude of Korean aid which included aiding 600,000 Korean troops was becoming a burden for the U.S., and was preventing the U.S. government from adopting its new foreign aid policy to Korea immediately. The U.S. government planned to commence the policy shift in Korea in 1964, which was essentially a switch from military aids to economic aids, accompanied by an establishment of a long-term aid plan as well as an offer of a development loan. The reason that the U.S. government did not actively support the first 5-Year Economy Development Plan in the early years of the “5.16” Military regime was not only because it differed in opinion of developmental strategy with the military government, but also because it was hard to shift its entire aid policy to Korea immediately. The Ulsan Industrial Complex(UIC), which also included the central factories for the first 5-Year Economy Development Plan, shows us how the Kennedy administration’s foreign policy was shifting at the time. In this transitional period, AID-USOM played more than an active role, by mediating American civilian investments for the UIC, and forcing changes in the military government’s initial plans for construction. This was a strategy of the U.S. foreign aid office designed to compensate for any problem that might arise due to the shift in policy itself. In the end, UIC was constructed not with the U.S. government’s development loan as hoped by the Korean military government, but with U.S. private -and direct- investments aggressively mediated by the U.S. foreign aid authorities.