• Environmental Engineering Research
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• v.20 no.4
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• pp.383-391
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• 2015

Transparent type noise barrier is a desirable facility since it provides a secure view to drivers and passengers. However, reflection from this type of barrier could annoy dwellers on the sides of the road. To reduce reflection noise by transparent type barrier, modification can be made to the shapes on the front side and hence get effects by distortion of sound transmission. To achieve this, we have conducted simulation by which the effects of patterned screens of noise barrier on high-ways were investigated. The reduction effects of reflected sounds were evaluated for swelling, swelling with curved, rectangular and V-shaped screen type barriers, compared to the planar panel. The emitting noise was generated by 6-lane road and the patterned noise barriers had shown the reduction effects, especially in swelling and swelling with curved type for middle height dwellers, and the V-shaped screen type for higher elevation dweller. The swelling-type showed a decrease of 0.7~1.2 dB, performing the best diminution effect among the tested noise barriers.

• Hwankyungkyoyuk
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• v.23 no.4
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• pp.124-136
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• 2010

The purpose of this study was to develop the environmental issues instruction materials for elementary students based on IEEIA model, and to investigate the influence of on environmental literacy of 6th graders in elementary school. A reconstructed questionnaire through Jin(2004)'s test tool is used to survey the effects of applying an environmental issue instruction materials. The i-STATistics program is used to analyze the results. The results of this study are as follows. First, this instruction materials had a positive effect on elementary school students' environmental literacy in environmental issue. Second, according to qualitative analysis, students appear to be more concerned and interested in the environment and environmental problem while participating in an environmental issue instruction based on the IEEIA model. In conclusion, the environmental issue instruction materials has a positive effect on environmental literacy. Therefore, this environmental issue instruction is meaningful as a new environmental education method, and it is necessary to more intensively and systematically research on the teaching-learning activities related to this study.

• Proceedings of the Korean Environmental Health Society Conference
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• 2004.12a
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• pp.87-87
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• 2004

• Journal of the Korean Society of Food Culture
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• v.27 no.3
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• pp.251-260
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• 2012

This study was designed to provide practical environmental marketing data by measuring the effect of environmental marketing on customer loyalty and trust at coffee stores. The results were obtained by empirical analysis and are summarized as follows. The first hypothesis, the effect of environmental marketing on consumer trust at coffee stores, showed that environmental marketing at coffee stores had a statistically significant positive effect on consumer trust. Price, product, and facilities as sub-factors of environmental marketing at coffee stores had effects on consumer trust. Especially, facilities was the highest. The second hypothesis, the effect of environmental marketing on customer loyalty at coffee stores, showed that environmental marketing at coffee stores had a statistically significant positive effect on customer loyalty. Price, product, and facilities as sub-factors of environmental marketing at coffee stores had effects on customer loyalty. Especially, facilities was the highest. The third hypothesis, the effect of consumer trust on customer loyalty at coffee stores, showed that consumer trust at coffee stores had a statistically significant positive effect on customer loyalty. Improvement of consumer trust by environmental marketing was an important factor in improving customer loyalty. As for these findings, price, product, and facilities as sub-factors of environmental marketing at coffee stores had effects on consumer trust and loyalty. Consequently, these findings provide helpful information for coffee stores to plan environmental marketing strategies and establish direction, and they can be used for management activities.

• Environmental Analysis Health and Toxicology
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• v.25 no.3
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• pp.181-186
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• 2010

Perfluorinated Compounds (PFCs) are anthropogenic compounds found in trace amounts in many environmental compartments far from areas of production. Along with the highly persistent nature of PFCs, there are increasing concerns over the potential adverse effects of them on the ecosystems. Most of highly fluorinated compounds degrade into PFOS and PFOA that are very stable compounds hard to break down. So, in this study, we tried to determine the toxicity of PFOS and PFOA in the terrestrial invertebrate. Acute toxicity test using earthworm, Eisenia fetida, was performed according to the OECD test guideline 207 (Earthworm, Acute Toxicity Tests). In the 14 day acute toxicity tests, the highest concentration causing no mortality and the lowest concentration causing 100% mortality of PFOS were 160 and 655 mg/kg (dry weight), respectively. And the highest concentration causing no mortality and the lowest concentration causing 100% mortality were 500 and 1,690 mg/kg (dry weight), respectively in the PFOA-exposure group. 14 day-LC50 values were estimated at the level of 365 and 1,000 mg/kg (dry weight) in the PFOS and PFOA-exposed group. These results indicate that under laboratory conditions PFOS is about 3 times more toxic to earthworms than PFOA. Based on known environmental concentrations of PFOS in the soil of Korea, which occur in the 0.42~0.73 ng/L range, there is no apparent risk to terrestrial invertebrate, earthworms. However, further work is required to investigate long-term effects on these and other terrestrial organisms.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2000.12a
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• pp.89-89
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• 2000

• Proceedings of the Korean Society for Environmental Edudation Conference
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• 2004.12a
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• pp.153-161
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• 2004

• Environmental Analysis Health and Toxicology
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• v.11 no.3_4
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• pp.59-63
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• 1996

In present study, we fractionated polysaccharides from Croton tiglium and investigated their hepatoprotective effects on CCl$_4$ intoxication. Polysaccharide fraction of which molecular weight is over 300,000 (HP) showed the most potent hepatoprotective effects on CCl$_4$ intoxication. Lipid peroxidation, sAST and sALT were used as parameters to evaluate the liver damage. Glucose, xylose and arabinose were found to be monosaccharides composing sugar moiety of HP.

• Journal of Distribution Research
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• v.10 no.1
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• pp.85-106
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• 2005

This study has investigated the mediating effects of dependence, goal incongruence, and conflict in processing of environmental dynamism effects on the dissolution intention in the discount store industry. As the result of hypotheses test using data collected from 180 supplier samples, environmental dynamism has the positive effects on dependence, goal incongruence, and conflict. Goal incongruence has the positive effect on conflict. Goal incongruence and conflict has the positive effects on dissolution intention. But, dependence didn't decrease dissolution intention significantly. Finally, the authors discussed the theoretical contributions, managerial implications, and limitations of this study and presented the future research directions.

• Journal of Environmental Science International
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• v.27 no.9
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• pp.789-796
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• 2018

This study aims to measure the emotional effects of pet plants, which have become popular in recent years. A questionnaire regarding perceptions of these indoor plants was administered to 78 university students. Thirty of these students took care of two species of pet plants for 90 days, and the emotional effects of this exercise were determined based on the type of words used in their daily records. The questionnaire results showed that the general recognition of emotional effects was low, though awareness of the term "pet plants" was high. However, after gardening for 90 days, participants began to consider their pet plants friends or family members, noting feelings of affection and sympathy in their daily writeups. These participants also experienced positive changes in their emotional well-being, including feelings of joy, hope, relaxation, confidence, and accomplishment. This study argues that pet plants can have positive effects on emotional stability and suggests that their adoption would be beneficial to humanity at large.