• Journal of Environmental Science International
• /
• v.20 no.5
• /
• pp.611-621
• /
• 2011

This study aims to find out an effect of 3 types of environment worksheets used for 5th elementary graders's environmental class on their environmental perceptions and behavior. 104 of 5th graders in M elementary school in Ulsan Metropolitan City were selected and divided into A group(35), B group(34) and C group(35) for this study, and to A group, a class used worksheet of the photo taken clean, unpolluted environment, and to B group, a class used worksheet of the photo taken polluted environment and to C group, a class used worksheet of only text without photo were carried out. The worksheet used class was conducted 5 times, and then after the classes, the student's change in environmental perceptions and behavior by group was put into verification Below are the study results. First, the worksheets used for the environment class have incurred significant differences in student's environmental perceptions by their types. A. B groups were higher than C group in their post-test environmental perceptions score, a statistically significant differences. Meanwhile, statistically insignificant differences appeared in environmental perceptions score between A and B groups. Second, the type of worksheet used for environment class represented considerable differences in he students' environmental behavior. A group was higher than B. C groups in post test environment behavior score, the difference of which was statistically significant. While statistically insignificant difference represented in environmental behavior between B, C groups. Third, the both types of worksheets of the photo of positive environment and that of negative environment appeared to be effective statistically in changing the elementary students' environmental behavior, while the worksheets of the photo of positive environment appeared to be effective statistically in their environmental behavior.

• Environmental Mutagens and Carcinogens
• /
• v.16 no.1
• /
• pp.24-29
• /
• 1996

In this study, the micronucleus test with peripheral blood using acridine orange coated slides was evaluated in mice treated with mitomycin C(MMC) at doses of 0.5, 1.0 and 1.5 mg/kg body weight. The peripheral bloods were obtained at 0, 24, 48 and 72h after treatment. The frequencies of micronucleated reficulocytes(MNRET) in the MMC-treated groups increased dose-dependently, and showed a peak time at 48h after treatment. We also performed the sex differences of MNRET frequency in 0.5 mg/kg MMC treated group, and we observed no sex differences in this experiment. And we evaluated the usefulness of a direct acting clastogen, N-methyl-N-nitrosourea and a indirect acting clastogen, benzo(a) pyrene as the positive control in this supravital micronucleus test. They also caused a significant increase in MNRET frequencies. These results suggest that the supravital staining micronucleus test using MNRET can be useful tool to evalulate the quantitative and qualitative assessment of genotoxicity in vivo compared to classical in vivo micronucleus test using bone-marrow cells.

• Journal of Environmental Science International
• /
• v.6 no.4
• /
• pp.379-384
• /
• 1997

The biodegradable characteristics of poly-$\beta$-hydroxybutyrate(PHB) film by fun맥 and soil burial are Investigated. As the results of the American Standards for Testing and Materials(ASTM) method, the you of Aspergillus niger was apparent on the PHB containing plate. This suggests that PHB was utilized as the sole carbon source by Aspergillus niger and ASTM method may have applications as measuring means of biome gradability of polyhydroxyalkanoic acid(PHA). PHB film was studied by monitoring the time-dependant changes in weight loss of PHB film under 30% and relative humidity 80 % during pot-test. As the results of pot-test, PHB film was decomposed about 87 % in 30 days by soul microorganisms. PHB film was more slowly degraded than PHB/HV film.

• Journal of the Korean Society of Groundwater Environment
• /
• v.7 no.1
• /
• pp.20-23
• /
• 2000

A general solution for determining the storage coefficient from multi-step pumping test recovery data is suggested. This solution is essentially based on the method of Banton and Bangoy (1996), which used single-step pumping test recovery data. The suggested solution can be applied to any-step pumping test recovery data. We have demonstrated the applicability of the general solution to single-, double-, and triple-step pumping and/or step-drawdown test data partially described in Lee and Lee (1999). The estimates of storage coefficient as well as transmissivity are well consistent with the values from other methods for pumping phase data.

• Environmental Analysis Health and Toxicology
• /
• v.15 no.4
• /
• pp.157-163
• /
• 2000

2- [(4- Cyanophenyl)amino] -3-chloro-1, 4- naphthalenedione (NQ-Y15) was asssayed for its genotoxic potential by using Salmonella typhimurium reversion assay and in vitro chromosome aberration test on Chinese hamster lung cells. In the Ames test, NQ-Y15 induced his + revertants of Salmonella typhimurium TA 98 and TA1537, reaching levels twice the negative control values. But, NQ-Y15 induced only his+ revertants of Salmonella typhimurium TA1537 more than twice the control values under the condition with metabolic activation system. In the cytogenetic test on chinese hamster lung cells. NQ -Y15 showed significant chromosomal aberrations, but the incidence was significantly reduced in the presence of metabolic activation.

• Korean Journal of Ecology and Environment
• /
• v.40 no.2
• /
• pp.173-183
• /
• 2007

The Ministry of Environment plans to introduce the Whole Effluent Toxicity (WET) system in Korea. The WET test is well established in developed countries with recognizing of the limitations of physicochemical analysis method and potential risk of chemicals in water medium. Therefore, it is essential to build the ecotoxicity infrastructure for the induction of WET test. In this study, we extensively collected the domestic and foreign toxicity test methods which employ native test species to Korea. And we suggested that the domestic ecotoxicity test methods with domestic test species in Korea through extracting the range of test conditions. Five domestic fish species selected were Carassiu auratus (Crucian carp), Cyprinus carpio(Common carp), Gasterosteus aculeatus (Three spine stickleback), Misgurnus anguillicaudatus (Oriental weather fish) and Oryzias latipes (Japanese medaka), The toxicity test methods with native test species to Korea were collected from the standard methods (OECD, U.S. EPA, ASTM), government reports, SCI papers and domestic papers. We collected the 32 test methods, and suggested the suitable aquatic toxicity test methods for fish. It is expected that this study could prove a useful information to establish the ecotoxicity test methods with domestic aquatic organisms in Korea henceforth.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2006.03a
• /
• pp.506-513
• /
• 2006

In this study, multi-level hi-direction pile load tests for drilled shaft pile socketed into the gravel were performed. The lower and upper hi-direction load test assemblies were located on tip of pile and 15m above the tip of pile. Based on the results of pile load test, it was analyzed bearing capacity of gravel, skin firction of upper soils and skin friction of lower soils. It was confirmed that drilled shaft socketed into the gravel had enough bearing capacity.

• Journal of Power System Engineering
• /
• v.20 no.5
• /
• pp.52-59
• /
• 2016

Environmental Qualification has been almost developed except those of Non-Material Sub-components for valves and pumps though the time has only passed about 10years since EQ test launch of Korea. However EQ test has been performed by a few of engineers under the conditions that experience of EQ test is insufficient and EQ system is not developed completely. In recent years, Strengthen Nuclear Safety Regulation is being done Strictly Nuclear safety components Verification Procedure for Non-Material Sub-components, but the reports contain only performance test results, not Enviro nmental test methods relating to real Aging Degradation. In this Study, there were developed to performance systematically research to acquire EQ technology for five specimens of the Non-Material Sub-components in the Nuclear Power Plant.

• Environmental Mutagens and Carcinogens
• /
• v.17 no.2
• /
• pp.92-96
• /
• 1997

The micronucleus test using peripheral blood reticulocytes (RETs) was evaluated in ICR mice treated with N-methyI-N-nitrosourea (MNU) and benzo(a)pyrene [B(a)P] as model clastogens. The frequency of micronucleated reticulocytes (MNRETs) in both positive compounds was similar to other results which were reported previously. On the other hand, an anticlastogenic effect of the natural antioxidant, $\beta$-carotene and one of taroholds, galangin as model anticlastogens were investigated using simultaneous treatment. Mice were treated with a model clastogen alone, or with a model clastogen and a model anficlastogen simultaneously. Both $\beta$-carotene and galangin showed anticlastogenic effects against MNU- or B(a)P-induced micronuclei in mice. However, galangin has stronger activity than $\beta$-carotene. Results from our experiment suggest that the in vivo supravital staining micronucleus test using peripheral blood is useful in the evaluation of clastogenic and anticlastogenic effects.

• Journal of Environmental Science International
• /
• v.11 no.9
• /
• pp.851-855
• /
• 2002

A comparison of Daphnia magna, Ceriodaphnia dubia and Simocephalus mixtus toxicity test was performed to study the relative sensitivities and discrimination abilities with both pore and elutriate water of Woopo wetland sediments. Sediment risk assessment has been done by standardized preparation method of pore and elutriate water described in the joint US EPA-US Army Crops of Engineers manual. Simocephalus mixtus which was obtained from Woopo wetlands in Korea was cultured and applied to sediment toxicity test. Water quality in Woopo wetland had great site and seasonal variations. S. mixtus was more sensitive than D. magna in heavy metal toxicity test. The toxicity results with S. mixtus reflected the water quality of elutriate and pore water. The results also suggested that S. mixtus could be used as a test organism in estimating potential risk of contaminated sediments.