• Journal of the Korean Society of Earth Science Education
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• v.9 no.3
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• pp.243-254
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• 2016

This study investigated that internalized images of earth scientist's work of 110 high school students who complete a course in Earth Science I through drawing. As a result that reflected the character of earth science as a school subject, it is shown that nearly half of the students believe that earth scientist's working place is outside. An object of study is limited to such areas as astronomy and geology, it says that students has little understanding of areas of atmospheric and oceanic sciences. There are lots of answers that tools for working are telescope or microscope, it reveals a huge difference between the results of advanced research that analyzed the typical experimental devices, and students realized that working is not invention but survey. We should try students to recognize earth scientist as a job with relation to their future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.8
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• pp.5150-5158
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• 2014

This study examined the physicochemical characteristics of mashing prepared using different Nuruks (traditional Nuruk, Nuruk added Aspergillus oryzae, Nuruk added Aspergillus kawachii, and Nuruk added Aspergillus oryzae and Aspergillus kawachii), and to obtain the basic data for Korean Cheongju production. The four different mashes were compared for their brewing characteristics and indicated a normal fermentation pattern. The Nuruk made from A. oryzae or A. kawachii showed higher fermentation ability than the other samples tested. In addition, the analyzed results of fermented mashing showed that the Nuruk made from A. oryzae or A. kawachii had a significantly higher aroma profile, such as higher alcohol and ester than the other samples tested, whereas the Nuruk made from a mixture of A. oryzae and A. kawachii had a much higher organic acid content. In conclusion, the Nuruk prepared using A. oryzae or A. kawachii had a positive effect on the complete fermentation and enhanced aroma compounds for Korean Cheongju production.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.5091-5096
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• 2013

Houttuynia cordata Thunb is a famous traditional Chinese medicine. Also it has rich in functional and bioactive substances with outstanding immunopotentiation, anti-cancer, antimicrobial, and anti-aging effects. This study was evaluated water and 70% ethanol extracts of Houttuynia cordata Thunb using in vitro system antioxidant properties methods. The scavenging DPPH and ABTS radicals of 2 mg/mL 70% ethanol extract were 91.8 and 54.8%, respectively. Also, The FRAP assay of this showed increase in activity. In results, the antioxidant properties of 70% ethanol extract increased significantly compared to water extract(p < 0.05). Therefore, 70% ethanol extract of Houttuynia cordata Thunb may contribute to antioxidant property.

• Analytical Science and Technology
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• v.13 no.6
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• pp.699-704
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• 2000

A study has been made for the electrochemical destruction of cyanide ions and removal of zinc ions from a simulated electroplating wastewater by the use of a platinum platized-titanium anode and a stainless steel cathode. Several experimental parameters, including electrolysis time, cell current, additives, and chloride concentration, have been investigated and used for efficient destruction of cyanide waste and removal of zinc ions from aqueous solutions. It was found that cell current and type of additives gave great effects on the destruction of cyanide ions and removal of zinc ions. The optimized conditions (electrolysis time: 1hr, current: 12A, additive: 0.5 M NaCl) have been defined to destroy cyanide ions and remove zinc ions with high efficiency and low operation cost. The proper reaction mechanism leading to the destruction of cyanide on the anode has also been discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.4A
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• pp.360-370
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• 2010

In this paper, a distributed beamforming problem is considered in an amplify-and-forward (AF) wireless relay network consist of multiple source-destination pairs and relaying nodes. To exploit degree of freedom of the number of beamformers, in the first step, we proposed that the sources transmit their signals through orthogonal channels. During the second step, the relays transmit their received signals multiplied by complex weights to amplify and compensate for phase changes introduced by the backward channels through one common channel. The optimal beamforming vectors are obtained through minimization of the total relay transmit power while the signal-to-interference-plus-noise ratios (SINRs) at the destinations are above certain thresholds to meet a quality of services (QoSs) level. In the numerical example, it is shown that the proposed scheme needs less transmit power for moderate network data rates than other schemes, such as space division multiplexing or time-division multiplexing scheme.

• Hwankyungkyoyuk
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• v.19 no.3
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• pp.123-137
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• 2006

Since 1985, the Ministry of Environment has supported environmental education in schools through Environment Conservation Model School initiative. Selected elementary, middle, high schools and kindergartens were designated as model schools for environment conservation programs every 2 years to develop model cases that can be adopted at other schools to promote more structured and effective environmental education. These supporting programs played a central role in developing an environmental education model for formal schools and enhance the importance of environmental education in school curriculum. This study aims to evaluate the current statues of environment conservation model schools and support to environment conservation model school initiatives which have created basic framework to enable the continued development of environmental education. For the study, documents and reports from 1985 to 2005 were analyzed, which included operation guidelines for model schools, case studies, implementation reports along with the systematic analysis of documentations. Also this study included interviews and a survey with people responsible for running programs, and consultation processes with experts to address the current status and issues related to Environment Conservation Model School initiative. Based on the present status and issues, the recommendations for improving Environment Conservation Model School initiative were provided.

• Korean Journal of Veterinary Service
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• v.40 no.2
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• pp.89-94
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• 2017

This study was conducted from May to December 2016 to investigate the prevalence of antibody titers for Newcastle disease (ND), Infectious Bronchitis (IB), Egg drop syndrome (EDS), Avian pneumovirus (APV), Fowl Typhoid (FT), Mycoplasma gallisepticum (MG), Mycoplasma synoviae (MS) in laying hens in Incheon area. In ND, 418 (99.5%) of the 420 outbreaks were positive. IB showed 330 (78.5%) positive antibody out of 420 cases. EDS showed 419 (99.7%) positive seropositive rates among 420 cases. In the case of APV, 357 cases (85%) were positive in 420 cases. In the case of PT, the positive rate of antibody was 128 (30.4%) out of 420 cases. Among the 420 cases of MG, 222 cases (52.8%) were positive for antibodies. In the case of MS, 395 out of 420 cases (94.0%) were positive. This result suggests that the positive rate of antibody for PT in Incheon area was low. And it was also clear that MS without vaccine is now rampant in Incheon.

• Journal of agricultural medicine and community health
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• v.23 no.1
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• pp.39-49
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• 1998

This paper is conducted to find out the current status of farmers's syndrome and injuries due to agricultural machines and pesticides by questionnaire during 4 days from July 31 to August 2, 1996. The subjects were 706 people, 332 of men and 384 of women those who live in a rural area in Yungduk-gun, Kyungsangbuk-do, Korea. The results obtained are as follow. 1. The rate of farmer's syndrome like that shoulder pain, lumbago, numbness, nocturia, dyspnea, insomnia dizziness and abdominal pain were generally higher in women than men except shoulder pain. Of them, lumbago was highest, 61.2% in men, and 78.1% in women respectively. It was higher in rate and older in age. 2. In the score of farmer's syndrome classified by Kumagai(1943) in Japan, the suspected cases with three points over 60.6% in men and 81.8% in women. 3. The prevalence of injuries by agricultural machine was 31.2% for a year from August 1995 to July 1996. The cumulative rate was 6.66%(11.8% in men and 2.34% in women) with previous cases from the before years. The major sites of injuries were arm, leg and chest in order. Among the injuries cases, 55.32% had been physical impediment. 4. The experience rate of intoxication by pesticides was 24.9% to total subjects. And dermatologic sign was 7.0%. Experience of treatment with only one time was 60.0%, and that with five times over, 20.0% Of them 18 cases had been administered in hospital.

• Korean Journal of Veterinary Service
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• v.37 no.4
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• pp.297-305
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• 2014

Animals and disease frequency of the rescued dogs were investigated in Incheon Veterinary Medical Association Animal Shelter from January in 2012 to December in 2013. Three zoonoses (rabies, brucellosis, and dirofilariosis) and three infectious diseases (canine distemper, canine parvoviral enteritis, and canine influenza) were examined for stray dogs. Among 5,603 heads, 647 (11.5%) went back to their owner and 969 (17.3%) were adopted to new families. Prevalence of dirofilariosis, canine distemper and canine parvoviral enteritis were 2.2% (16/718), 6.0% (24/399) and 6.1% (24/396), respectively. Positive antibody rates against rabies, B. canis and canine influenza virus were 20.5% (41/200), 0.1% (1/718) and 2.0% (4/200), respectively. Protective antibody for canine distemper virus and canine parvovirus were shown in 47.0% (94/200). The data indicate that control measures including facility standards and disease control program are one of the important aspects of the shelter management because stray dogs are exposed to various infectious agents.

• The Bulletin of The Korean Astronomical Society
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• v.38 no.1
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• pp.30.2-30.2
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• 2013

The mean color of globular cluster (GCs) systems in early-type galaxies (ETGs) is, in general, bluer than the integrated color of field stars in their host galaxies. Recently, Goudfrooij & Kruijssen (2013) reported that even red GCs in the ETGs show bluer colors than their host field stars and suggested the different initial mass function (IMF) for red GCs and field stars to explain the observed offset in color. Here we suggest an alternative scenario that explains the observed color offsets between red GCs in ETGs and the field stars in the parent galaxies without invoking to the variation of the IMF. We find that the inclusion of second-generation (SG) helium-enhanced populations in the model fully explains the observed color offset between red GCs and field stars in the host galaxies. We have also tested the effect of the IMF slope on our models, but the effect is relatively small compared to the effect of the SG population. Our new model suggests that, in order to explain far-UV strong metal-rich GCs in M87 and the observed color offset between metal-rich GCs and the field stars in ETGs simultaneously, the inclusion of the SG populations with enhanced helium abundance is a more natural solution than the model that only adopted variations in the IMF.