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JOURNAL OF THE KOREAN ENVIRONMENTAL SCIENCES SOCIETY

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수록범위 : 1권1호(1992)~27권10호(2018) |수록논문 수 : 3,227
한국환경과학회지
27권10호(2018년) 수록논문
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KCI등재

1Effect of Hydrocarbon Additives on SNCR DeNOx Characteristics under Oxidizing Diesel Exhaust Gas Conditions

저자 : Changmo Nam

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 809-820 (12 pages)

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DeNOx experiments for the effects of hydrocarbon additives on diesel SNCR process were conducted under oxidizing diesel exhaust conditions. A diesel-fueled combustion system was set up to simulate the actual cylinder and head, exhaust pipe and combustion products, where the reducing agent NH3 and C2H6/diesel fuel additives were separately or simultaneously injected into the exhaust pipe, used as the SNCR flow reactor. A wide range of air/fuel ratios (A/F=20~40) were maintained, based on engine speeds where an initial NOx level was 530 ppm and the molar ratios (β=NH3/NOx) ranged between 1.0~2.0, together with adjusting the amounts of hydrocarbon additives. Temperature windows were normally formed in the range of 1200~1350K, which were shifted downwards by 50~100K with injecting C2H6/diesel fuel additives. About 50~68% NOx reduction was possible with the above molar ratios (β) at the optimum flow #1 (Tin=1260K). Injecting a small amount of C2H6 or diesel fuel (γ=hydrocarbon/NOx) gave the promising results, particularly in the lower exhaust temperatures, by contributing to the sufficient production of active radicals (OH/O/HO2/H) for NOx reduction. Unfortunately, the addition of hydrocarbons increased the concentrations of byproducts such as CO, UHC, N2O and NO2, and their emission levels are discussed. Among them, Injecting diesel fuel together with the primary reductant seems to be more encouraging for practical reason and could be suggested as an alternative SNCR DeNOx strategy under diesel exhaust systems, following further optimization of chemicals used for lower emission levels of byproducts.

KCI등재

2Effects of LED Light Quality of Urban Agricultural Plant Factories on the Growth of Daughter Plants of 'Seolhyang' Strawberry

저자 : Kook-han Lee

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 821-829 (9 pages)

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This study was conducted to examine the influence of Light-Emitting Diode (LED) light quality in urban agricultural plant factories on the growth and development of Seolhyang strawberry daughter plants in order to improve the efficiency of daughter plant growth and urban agriculture. LED light quality by demonstrated that above-ground growth and development were greatest for daughter plant 2. Daughter plant 1 showed the next highest growth and development, followed by daughter plant 3. Among the different qualities of LED light, the stem was thickest and growth rate of leaves was highest for R + B III (LED quality: red 660 nm + blue 450 nm/photosynthetic photon flux density (PPFD): 241-243 μmol·m-2·s-1) and lowest for R (red 660 nm/115-117 μ mol·m-2·s-1). Plant height, leaf width, petiole length, and the leaf growth rate were highest for W (white fluorescent lamp/241-243 μ mol·m-2·s-1) and lowest for R + B Ⅰ (red 660 nm + blue 450 nm/80-82 μ㏖·m-2·s-1). For above-ground growth and development, as the plants surpassed the seedling age, mixed light (red + blue), rather than monochromatic light (red or blue), and higher PPFD values tended to increase development. Regarding the quality of the LED light, daughter plant 2 showed the highest chlorophyll content, followed by daughter plant 1, and daughter plant 3 showed the least chlorophyll content. When the wavelength was monochromatic, chlorophyll content increased, compared to that when PPFD values were increased. Mixed light vitality was highest in daughter plant 2, followed by 1, and 3, showed increased photosynthesis when PPFD values were high with mixed light, in contrast to the results observed for chlorophyll content.

KCI등재

3Determining Optimum Pumping Rates of Groundwater in Ttansum Island Related to Riverbank Filtration

저자 : Chung-mo Lee , Se-yeong Hamm , Yeon-woo Choo , Hyoung-soo Kim , Jae-yeol Cheong

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 831-844 (14 pages)

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Riverbank Filtration (RBF) is a kind of indirect artificial recharge method and is useful in obtaining higher-quality source water than surface water when procuring municipal water. This study evaluated optimal riverbank filtered water and the productivity of the radial collector wells on Ttansum Island in the area downstream of the Nakdong River, where Gimhae City is constructing a municipal water plant for the purpose of acquiring high-quality water. The RBF wells are planned to provide water to the citizens of Gimhae City through municipal water works. Groundwater flow modeling was performed with the following four scenarios: (a) 9 radial collector wells, (b) 10 radial collector wells, (c) 10 radial collector wells and two additional vertical wells, and (d) 12 radial collector wells. This study can be useful in determineing the optimum production rate of bank filtrated water not only in this study area but also in other places in Korea.

KCI등재

4Characteristics of Andong Dam Inflow during Non-rainfall Seaso

저자 : Gey-hwan Park , Ki-bum Park , In-soo Chang

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 845-851 (7 pages)

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In this study, the runoff characteristics of the non-rainfall period were examined using daily rainfall data from 1977 to 2017 and the data of runoff into the dam. Results showed that, the mean runoff decreases with longer non-rainfall periods in the Andong dam basin. The correlation coefficient between non-rainfall days and average runoff reaches 0.85. The results of the analysis of the runoff characteristics during the non-rainfall period, based on the preceding rainfall of Andong dam are as follows. The runoff characteristics of the entire non-rainfall period, shows that, for a rainfall of 1.0 mm or less, the runoff height was larger than the rainfall size and the base runoff larger. The correlation between the antecedent rainfall and runoff height was reached as high as 0.9864 in the 30 ~ 50 mm interval of the antecedent rainfall period, and this is the interval where the linearity of rainfall and runoff was at its maximum in the Andong dam basin. The correlation between the antecedent rainfall and the runoff height reached 0.92 for rainfalls of 100.0 mm. However, for rainfalls of 100.0 mm greater, the correlation between the antecedent rainfall and runoff height during the rainfall period was 0.64, which is relatively small. In this study, we investigated the runoff characteristics of the rainfall period in the Andong dam watershed. As a result, it was confirmed that the mean runoff decreased with rainfall duration. The linearity was found to be weak for rainfall events greater than 100.0 mm. The results of this study can be used as data for water balance analysis and for formulating a water supply plan to establish water resource management of Andong dam.

KCI등재

5Characterization of Biocompatible Lipid-Based Vesicles Contained with Medicinal Herb Extracts

저자 : Kyu-jin Lee , Sun Young Park , Geuntae Park

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 853-863 (11 pages)

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In order to increase the medicinal herbs efficiency of drug delivery, vesicles contained with medicinal herbs were prepared by phosphatidylcholines and surface active agent. Vesicles loaded with medicinal herbs were characterized by UV-spectroscopy, Zetasizer. The antioxidant activity of vesicles was measured by DPPH assay and ABTS radical scavenging assays. Also, an analysis was conducted to determine the effects of anti-inflammatory of vesicles contained medicinal herbs. In addition, the whitening effects of vesicles contained medicinal herbs extract were studied via tyrosinase inhibition assay. The results of vesicles were as follows. Vesicles appeared an average diameter of approximatively 164-599 nm. All studied vesicles contained with medicinal herbs showed antioxidant, anti-inflammatory and whitening effects in a dose-dependent manner. Therefore, this experiment achieves its purpose of synthesizing of vesicles. In conclusion, we recommended that the vesicles loaded with medicinal herbs have ability for anti-aging materials. Specifically, it will apply to cosmetic ingredients.

KCI등재

6A Study on the Development of Fruit Tree Experience Programs Based on User Segmentation

저자 : O Man Kwon , Junga Lee , Daeyoung Jeong , Jin Hee Lee

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 865-874 (10 pages)

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Fruit trees are a key part of agriculture in rural areas and have recently been a part of ecotourism or agrotourism. This study analyzes user segmentation based on user motivation to determine characteristics of potential customers in fruit tree farms, and thereby develop fruit tree experience and educational programs. We conducted a survey of 253 potential customers of fruit tree experience programs in September 2017. Data were evaluated using factor and cluster analyses. The results of the cluster analysis identified four distinct segments based on potential customers' motivations, that is, activity-oriented, learning-oriented, leisure-oriented, and purchase-oriented. These clusters showed that significant differences in the preference of potential customers exist. Different markets were segmented based on the benefits sought by users. The segments' characteristics were identified and activities relevant to each segment were proposed for rural tourism. Lastly, this study suggests directions for development of fruit tree farm experience and educational programs.

KCI등재

7Leaf Growth of Seven Fruit Trees in Response to Different Lights for Garden Tree

저자 : Yu Kyeong Nam , Jin Hee Lee , O Man Kwon

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 875-881 (7 pages)

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To select fruit trees suitable for shaded urban garden with Elaeagnus umbellata var. coreana, Malus domestica 'Alps Otome', Malus domestica 'Fujii', Prunus mume, Prunus persica for. persica, Rubus fructicosus, and Vaccinium corymbosum 'Reka', leaf growth in response to different light was investigated two years after 35% shade treatment. Leaf area of E. umbellata var. coreana, M. domestica 'Alps Otome', P. mume, P. persica for. persica, and V. corymbosum 'Reka' increased in shading. Fresh weight of leaves make inconsistent response to shading in every species but dry weight of E. umbellata var. coreana and P. persica for. persica showed the highest 150% and 148%, increment, respectively. Althought leaf water content of E. umbellata var. coreana decreased in shading, there is no difference in P. persica for. persica. Chlorophyll value of E. umbellata var. coreana and P. persica for. persica that showed higher than any other species is correlated with dark leaf green. Compared to specific leaf weight of E. umbellata var. coreana, P. persica for. persica, and V. corymbosum 'Reka' showed lower than any other species in shading, that of M. domestica 'Fujii', and R. fructicosus increased in reverse. These results indicate that E. umbellata var. coreana and P. persica for. persica that showed high value in several invesetigaton items are suitable for shady urban condition considering leaf growth in response to shading.

KCI등재

8An Analysis of Long-term Changes in Water Quality of Geumho River using Statistical Techniques

저자 : Kangyoung Jung , Sohyun Cho , Donwoo Ha , Taewoo Kang , Yeong Jae Lee , Kunyeun Han , Kyunghyun Kim

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 883-899 (17 pages)

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In this study, water quality data of eight main sites in the Geumho River watershed were collected and analyzed for long-term changes in water quality over the period from 2005 to 2015. The results showed that BOD concentration was gradually improved by the Total Maximum Daily Load (TMDL), stages 1 and 2. Recently, a tendency of increasing BOD concentration was observed in the downstream section of the river. The concentration of COD was analyzed to be contaminated throughout the water system regardless of the water quality improvement project, and the TN concentration tended to increase in the midstream of the river from 2013. The TP concentration has clearly decreased from 2012 after the second stage of TMDL. For the statistical analysis of PCA ordination, monthly water qualities (pH, DO, Electrical Conductivity (EC), Water Temperature (WT), BOD, COD, TN, TP, TOC, and SS) and flow rate data for 5 years from 2012 to 2016 were used. Seasonally the Geumho River showed an increase in the TN concentration at point sources during the dry season (December to February). TP showed the effect of non-point sources in the summer, because rainfall has caused a rise in flow rate in the upstream. Besides, the origin of pollution source was changed from non-point sources with BOD, COD, and TOC.

KCI등재

9A Molecular Dynamics Study of the Interaction of Oxygen Molecules with a Water Droplet

저자 : Matthew Stanley Ambrosia

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 901-906 (6 pages)

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Water and oxygen are two of the most essential molecules for many species on earth. Their unique properties have been studied in many areas of science. In this study, the interaction of water and oxygen molecules was observed at the nano-scale. Using molecular dynamics, a water droplet with 30,968 water molecules was simulated. Then, 501 oxygen molecules were introduced into the domain. A few oxygen molecules were attracted to the surface of the water droplet due to van der Waals forces, and some oxygen molecules actually entered the water droplet. These interactions were visualized and quantified at four temperatures ranging from 280 to 370 K. It was found that at high temperatures, there was a higher possibility of the oxygen molecules penetrating the water droplet than that at lower temperatures. However, at lower temperatures, oxygen molecules were more likely to be found interacting at the surface of the water droplet than at high temperatures.

KCI등재

10Impact of Topsoil Stockpiling Methods on the Viability of Seed Banks

저자 : Myung-hoon Yi

발행기관 : 한국환경과학회 간행물 : 한국환경과학회지 27권 10호 발행 연도 : 2018 페이지 : pp. 907-923 (17 pages)

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The aim of this study was to determine the appropriate stockpiling methods for revegetation by comparing the germination status of seed banks before and after preservation for 2 years. Soil temperature in stockpiled topsoil was higher in open treatment and at 1.5 m, whereas soil water content was maintained at lower levels (14.06-19.08%), than those in the control group. The seed banks in stockpiled topsoil had 48 species and 1,559 individuals, among which perennials showed the highest number in terms of life forms, whereas Compositae and Gramineae were dominant in terms of families. Based on seed bank type, persistent seed banks had the highest number of species, while transient seed banks had the highest number of individuals. By stockpiling period, the number of species in the seed bank started to increase after 24 months, while the number of individuals began increasing after 12 months and exceeded that of the control group after 24 months. Regarding the treatment of stockpiling methods, the number of species and individuals in open treatment were closer to those of the control group. When analyzed by height, the number of species and individuals were higher at 0 m, but still lower than those of the control group. A multivariate analysis of variance (MANOVA) showed that the optimal combination was obtained in open treatment and the number of individuals increased with the lengthening of the stockpiling period.

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