• 한국환경과학회지
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• 제19권2호
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• pp.229-236
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• 2010

As air pollution has emerged as one of the most pressing urban environmental concerns, many studies have investigated the influence of air pollutants(ex: $O^3$, $NO^2$, $SO^2$, Acid rain, etc.) on roadside trees and urban grove. In Korea, population density started to increase since the industrialization. Since dense population aggravates our living conditions, it's very important for us to preserve and keep a lively and refreshing nature in order to live with green nature in harmony under the current artificial environment-dominating world. In metropolitan cities, the production of pollutants increases in proportion to population growth. The vehicle exhaust gas and air pollutants from cooling and heating systems have been the major causes of acid rain. Furthermore, tire particles which are naturally produced by tire wearing on roads and other toxic substances in exhaust gas have caused a problem in human health directly and indirectly. In fact, a lot of studies have analyzed air pollution, roadside trees and plants in Korea. However, they are mostly limited to covering the influence of air pollution on the growth of plants. No paper has clearly explained why air pollution-resistant or-vulnerable species has shown different reactions yet. Even though a lot of urban roadside trees have died or stopped to grow from time to time, this kind of problem has not been properly examined. This paper is aimed to comparatively analyze physio-ecological characteristic such as photosynthesis, chlorophyll contents, soil volume water figure out their relationship with environmental factors against the expanding roadside trees in Cheong-ju, and provide basic data for management of roadside trees and elaboration of urban environment preservation policies.

• 한국물환경학회지
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• 제26권5호
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• pp.860-870
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• 2010

Long term monthly monitoring data showed that the water quality of streams flowing into Lake Paldang has been improved by various strategy for water. However, the effect of quality on Lake Paldang is still insufficient because of nonpoint source from watershed. In order to evaluate quantifying methods for pollution source and make a suggestion on improvements, Storm Water Management Model (SWMM) was constructed by using data set from the water quality and streamflow monitoring network in the Kyoungan watershed for Total Maximum Daily Loads (TMDLs). Load duration curve (LDC) based on the result of the Kyoungan watershed SWMM indicated that the water quality criterion on $BOD_5$ was often exceeded in up-stream than down-stream. From flowrate-load correlation curve, SS load significantly increased as streamflow increases. 75.3% of streamflow and 62.1% of $BOD_5$ loads is discharged especially in the zone of high flows, but monitoring data set didn't provide proper information about the conditions and the patterns associated with storm events. Therefore, it is necessary to acquire representative data set for comparing hydrograph and pollutograph through monitoring experimental watershed and to establish methods for quantifying point and nonpoint source pollutant loads.

• Advances in Traditional Medicine
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• 제1권2호
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• pp.52-58
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• 2000

In order to develop convenient and reproducible methods for identification of ginseng drugs at a DNA level, RAPD (randomly amplified polymorphic DNA) and PCR-RFLP (PCR-Restriction fragment length polymorphism) analysis were applied within Panax species. To authenticate Panax ginseng betvyeen Chinese and Korean ginseng population, RAPD analysis were carried out using 20 mer-random primer. The similarity coefficients among the DNA of ginseng plants analyzed were low, ranging from 0.197 to 0.491. In addition, using PCR-RFLP analysis, very different fingerprints were obtained within Korean ginseng plants. These results suggest that these methods are able to authenticate the concerned Panax species. Broader application of this approach to authenticate other morphologically similar medicinal materials is rationalized.

• 농약과학회지
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• 제5권3호
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• pp.54-57
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• 2001

새로운 bicyclic 4,5,6,7-tetrahydroindazole 유도체들을 합성하여 논 조건에서 제초활성을 시험하였다. 이 화합물들은 $0.063{\sim}0.25kg/ha$ 범위의 처리에서 벼에는 안전하면서도 피와 물달개비 등을 효과적으로 방제하였다.

• Korean Journal of Mathematics
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• 제21권3호
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• pp.311-318
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• 2013

We continue the study of power-Armendariz rings over IFP rings, introducing $k$-power Armendariz rings as a generalization of power-Armendariz rings. Han et al. showed that IFP rings are 1-power Armendariz. We prove that IFP rings are 2-power Armendariz. We moreover study a relationship between IFP rings and $k$-power Armendariz rings under a condition related to nilpotency of coefficients.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 추계학술발표논문집 2부
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• pp.996-999
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• 2010

본 연구는 성인 남성들의 비만도에 영향을 주는 요인을 사회 경제적, 건강관련 행동적 측면에서 규명하기 위하여 일개광역시 A부대에 2009년 4월과 5월에 입소한 장병 4,923명을 대상으로 건강관련 행태관련 설문조사를 한 후 비만도를 산출하고 비만과 관련 요인을 분석하였다. 입대전 가구의 월평균 소득이 비만과의 관련성에서 긍정적 효과를 주는 것으로 판단된다. 그러나 우리나라의 경우 아직까지 경제적 수준에 따른 비만의 유병률에 대한 일관성 있는 결과가 도출되고 있지 못한 실정으로 연령, 유전, 직업, 교육수준, 소득 등의 지표들을 사용한 비만과의 관련성에 대한 구체적인 후속 연구가 필요할 것으로 생각된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.339-339
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• 2010

Photo-assisted wet chemical etching of GaN thin film was studied using KOH based solutions. A $2{\mu}m-2{\mu}m$ titanium line-and-space pattern was used as a etching mask. It is found that the etching characteristics of the GaN thin film is strongly dependent on the pattern direction by unisotropic property of KOH based solution. When the pattern was aligned to the [$11\bar{2}0$] directions, ($10\bar{1}n$)-facet is revealed constructing V-shaped sidewalls.

• 동의생리병리학회지
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• 제23권5호
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• pp.1012-1018
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• 2009

The purpose of this research was to investigate the pharmacological effects of preparations containing beta-carotene, $Beautycarotene^{TM}$. $Beautycarotene^{TM}$ increased the collagen synthesis in CCD-986sk cells, DPPH radical scavenging activity and tyrosinase inhibitory activity in vitro system. In addition, it enhanced the viability of murine thymocytes and the population of splenic $CD4^+$ cells. Also, it increased the phagocytic activity of murine peritoneal macrophages. These results indicate that $Beautycarotene^{TM}$ can have a protective effect of skin via the diverse action, such as the stimulatory action of collagen synthesis, antioxidative action, tyrosinase inhibitory action and immune regulatory action.

• Journal of Dairy Science and Biotechnology
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• 제31권2호
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• pp.161-164
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• 2013

The prevalence rate of osteoporosis in older men and women has recently increased, and thus bone health is a major concern in Korea. This concern, along with increasing concern regarding youth height, has led to growth of the functional food industry for children, reaching approximately 200 billion won. It is necessary to develop safe and effective functional materials for bone growth and health. Foods are excellent sources of functional material as they are safe to use. It is well known that the phosphopeptide casein, which is derived from milk, is effective against osteoporosis by aiding in the absorption of calcium. In our study, collagen peptides derived from porcine skin were evaluated as a functional material for bone growth, as several peptides have been shown to aid in osteoblast formation.

• 전기학회논문지
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• 제56권12호
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• pp.2184-2188
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• 2007

We developed a novel method of partial discharge(PD) location based on the fact that the waveform of PD signal propagate along the GIB (Gas Insulated Bus) is composed of several modes of electromagnetic wave with different group velocities and cut-off frequencies. From the PD waveform, measured at a broadband PD sensor attached on the GIB, we could derive arrival time and frequency components of different modes using the short term Fourier transform or etc. After the group velocities of different modes are calculated, the location of the PD source could be estimated. To show the effectiveness of this new locating method in a real on site application, we used this method to locate the position of a PD source at a 76 m long 345 kV GIB substation. The estimated location of the PD source using the method proposed above was in good agreement with the actual location found from the inspection result of internal component in the GIB with 2.4% of the estimation error.