• Journal of Korean Society for Atmospheric Environment
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• v.16 no.5
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• pp.529-537
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• 2000

Several Pt-based oxidation catalysts with different loading were prepared with various metal precursor solutions and characterized with H$_2$ chemisorption and TEM for Pt particle size. V was added to Pt-based catalyst for inhibiting SO$_2$oxidation reaction, as result, Pt-V/Ti-Si catalyst prepared by ERMS(Free Reduced Metal in Solution) method showed high enough activity and better inhibition on SO$_2$oxidation than Pt only catalyst. Optimum Pt particle size for diesel oxidation reaction turned out to be the size of around 20 nm. A prototype catalyst was prepared for light=duty diesel passenger car, and teated for the emission reduction performance with Korean regulation test mode(CVS-75 mode) on chassis dynamometer. The catalyst shows the performance reduction of 75~94% for CO, 53~67% for HC and 10~31% for PM. In the case of heavy-duty diesel catalyst, the domestic formal regulation teat mode D-13 was adopted for both Na engine and Turbo engine. The conversions of CO and THC are high enough(86% and 41%) while the reductions of NOx and PM are relatively low(3~11%).

• Korean Journal of Human Ecology
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• v.15 no.1
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• pp.71-81
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• 2006

The purpose of this study is to examine the differences in young children's multiple intelligence and social behaviors based not only on Montessori and general programs of day care centers but also on their gender and social- demographic factors. The subjects were 329 young children (182 boys and 147 girls aged from four to five) from two day care centers in Cheongju city. The instruments used in this study were HAPI (Hillside assessment of Perceived Intelligence) to measure the surveyee's multiple intelligence and Park & Lee's scale to measure their social behaviors. The frequencies, percentiles, mean, standard deviations, Cronbach a, t-teat, F and LSD were used to analyze the collected data through SPSS WIN program. The results of this study are as follows: 1) As for young children's multiple intelligence, there are differences according to young children's gender, order of birth, parents' level of education and teacher's working period out of social-demographic factors. 2) As for the young children's social behavior, there are differences according to young children's gender, mother's level of education and teacher's working period out of social-demographic factors.

• Korean Journal of Animal Reproduction
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• v.20 no.2
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• pp.135-141
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• 1996

Growth, mammary development, serum concentrations of growth hormone, prolactin and estradiol which affect the growth and mammary development, were investigated in Korean Native heifers and Holstein heifers from 5 months old to 15 months old. From 5 months old to 15 months old, body weights in Korean Native heifers averaged 37%, lower than those in Holstein heifers of the same age (P<.01). Teat volumes in Korean Native heifers are average 67% smaller than those in Holstein heifers. Analysis of serum protein by secondary electrophoresis showed differences in protein pattern between the breeds and between the individuals. From 5 months old to 15 months old, serum concentration of growth hormone in Korean Native heifers was averge 47% lower than that in Holstein (P<.01), yet prolactin concentrations in serum were about the same between the two breeds. However serum concentration of estradiol in Korean Native heifers was average 20% higher than that in Holstein of same age (P<.01). This result showed evidently that the decrease of the growth hormone concentration in serum, while growing up, causes to retard the growth and mammary development in Korean Native heifers compared to Holstein heifers.

• The Journal of the Korea Contents Association
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• v.2 no.1
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• pp.39-45
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• 2002

Author verification system of ancient literatures or art works are important in the aspects of cultural properties control and owner's properties estimation. For this, experts of cultural properties administration have been done in inspecting the author verification. But inspection fee of experts is expensive. Therefore, social demands are increasing the automatic author verification system. For this, this paper proposes the automatic author verification system by the edge structure analysis of art works. The method of edge structure analysis is adopted because of these feature factors are significant in the several feature factors. In the near future, 1 will develope the entire system to teat the various art works by comining several feature vectors. Finally, the effectiveness of this paper is demonstrated by the several experiments.

• Journal of Veterinary Clinics
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• v.16 no.2
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• pp.397-403
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• 1999

This study was designed to examine the clincotherapeutic effect of natural honeybee (Apis mellifera) venom in sows with mastitis, metritis and agalactia (MMA) syndrome. Sows with MMA syndrome after parturition were assigned to treated and nontreated control groups. In treated group, 22 sows were bee acupunctured once a day for 3 consecutive days. Acupuncture points of Jiao-chao (GV-1, at the indentation between the base of tail and the anus), Yang-ming (ST-18, outside at the base of teat) and Hai-men (ST-25, about 1 cm lateral to the umbilicus) were stung by the natural honeybees. In control group, 20 sows were intramuscularly injected with a standard dosage of penicillin G (400,000 IU/kg of body weight) once a day for 3 consecutive days. At post-treatment, 85.0% of control sows and 90.9% of sows in treated group recovered from MMA syndrome. Bee acupuncture therapy didn't show any side effects such as allergy, intoxication, hemorrhage, or infection. It might be concluded that apitherapy was effective in controlling of sows with MMA syndrome.

• Journal of Veterinary Clinics
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• v.21 no.3
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• pp.280-285
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• 2004

Pathological and bacteriological studies were made of a total of 111 udders from slaughtered Korean native cows originating from various locations in Chonnam province. Incidence of supernumerary teats was 8.1%. Gross lesions were found in 21.4% of mucous membranes of total teat cisterns; these lesions comprised epithelial hyperplasia (12.6%), congestion (4.1%), slight fibrosis (3.8%) and severe fibrosis with congestion (0.9%). Gross lesions in the glandular tissues were found in 35.1% of cows; these lesions comprised slight fibrosis (27.9%), moderate fibrosis (6.3%) and severe fibrosis with pus (0.9%). Mastitis was found only in one cow. One hundred and twenty-five strains of microorganisms were isolated from mammary gland fragments of the cows. Pathogens most commonly isolated were Staphylococcus spp.; most of them were minor mammary pathogens. Major mammary pathogens were Streptococcus spp. (9.6%) and E. coli (2.4%). Most of the isolates were susceptible to many of 13 antimicrobial agents used, but Streptococcus spp. and Gram-negative rods showed resistance to 7 and 8 agents, respectively. 97.5% of the isolates showed susceptibility to amoxicillin, but only 55.8% to erythromycin.

• Korean Journal of Materials Research
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• v.12 no.6
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• pp.436-441
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• 2002

Effect of Sn addition on the stress corrosion cracking(SCC) resistance of the Al-Cu-Mn cast alley was investigated by C-ring teat and electrical conductivity measurement, The electrical conductivity and SCC resistance increased by Sn addition. The alley containing 0,10%Sn showed maximum electrical conductivity and the best SCC resistance. At the same composition, the electrical conductivity and SCC resistance increased from peak aged condition to ever aged condition. The PFZ and coarse precipitates along the grain boundary were observed from TEM micrographs. The fracture mode of the alloy was confirmed as intergranular type and showed brittle fracture surface. The SCC mechanism of the alloy was concluded as the anodic dissolution model, The maximum hardness was increased from 130Hv in the Sn-free alloy to 156Hv in the 0.10%Sn added alloy.

• Geotechnical Engineering
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• v.14 no.4
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• pp.163-176
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• 1998

To apply piezocone test to soil classification, several classification charts based on correlations between its results and basic characteristics of soils have been developed. However, it is necessary to investigate their applicability to Korean soil, since they were the results obtained from the limited number of foreign sites. In this study, 41 piezocone penetration bests for various sixtes spreading widely over Korean territory were carried out. Correlations between piezocone teat results and basic characteristics and the applicability of existing classification charts were investigated. Conclusively, new classification charts based, on Unified Soil Classification System were developed with a local confidence.

• Transactions of the Korean Society of Mechanical Engineers
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• v.10 no.1
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• pp.96-101
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• 1986

The average heat transfer coefficient of 2-D impinging jet has been augmented as much as 60% on the wall with large-scale wavy roughness. The mechanism of this heat transfer augmentation is studied with emphasis on two primary flow structures in the impinging flow region by using either the surface floating method or the smoke-wire technique. They are the stream-wise vortex-like structure, which is characteristic to the impining jet, and the spanwise vortiecs associated with the flow separation around the roughness. The combined effect of these structures can effectively augment the heat transfer particularly in the downstream region where the teat transfer usually deteriorates consicerably.

• The Journal of Korean Physical Therapy
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• v.11 no.2
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• pp.149-161
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• 1999

The purpose of study wan to compare the effect of balance performance in the elderly by the strengthening exercise. Thirty-one health elderly women aged 60 to 79 years participated in this study. Participants were divided into exercise(21) and control group(10). Exercise participants received strengthening exercise for 45 minutes in three times a week for 6 weeks while control subjects continued their normal activities, Exercise included resisted hip flexion, extension, abduction and adduction, knee flexion and extension, ankle dorsiflexion and plantrarflexion. All subjects were assessmented clinical test of sensory interaction and balance. one leg stance test, Berg balance test. Exercise and control subjects were teated before, midway through, and at the end of the trial. These collected data were analyzed by using oneway and repeated ANOVA, scheffe's test, 1-test and correlation. The results of this study were as fellows. 1. There were statistically significant difference in balance performance clinical teat of sensory interaction, and balance(p<.01), one leg stance test(p<.05), Berg balance test(p<.05) by the strengthening exercise. 2. There was correlation between static balance and dynamic balance(p<.01). 3. There was correlation between static balance and weight(p<.05), dynamic balance and height(p<.01), and weight(p<.01).