• Journal of Food Hygiene and Safety
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• v.20 no.1
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• pp.58-63
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• 2005

To assess clastogenic effects of the wild ginseng culture extract (WGCE) in vivo micronucleus test was performed using 7 weeks old ICR mice. At 24 hours after 2nd treatment with wild ginseng culture extract at the doses of 0, 500, 1,000, and 2,000 mg/kg/day by peritoneal route mice were sacrified and marrow cells were prepared for smear slides. As a result of counting the micronucleated polychromatic erythrocyte (MNPCE) of 2,000 polychromatic erythrocyte(PCE), all treatment groups did not show statistically significant increase than negative control group. And there was no clinical sign connected with injection of wild ginseng culture extract. It was concluded that wild ginseng culture extract did not induce micronucleus in the marrow cells of ICR mice.

• Journal of the Korean Applied Science and Technology
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• v.37 no.4
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• pp.915-924
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• 2020

This study was a descriptive research study to identify the influencing factors on learning commitment of nursing students. Method: Data were collected from nursing students in two different universities in D and G metropolitan city. The data collection period was from November 26 to December 7, 2018. The analyzed by descriptive statistics, t-test, Scheffe test, Pearson's correlation coefficients, and multiple regression analysis using SPSS/WIN 21.0. Results: Learning commitment of the participants showed statistical differences according to grade level, satisfaction in major and interpersonal relationship. Learning commitment was positively correlated with self leadership (r=.738, p<.001). The factors affecting learning commitment were the needs for grade level (β=-.212, p=.011), satisfaction in major (β=.248, p=.001) and self leadership (β=.598, p<.001) explaining 58% of the total variance of learning commitment. Conclusion: As a result of this study, increase learning commitment in student nurses, it is necessary to develop program promoting satisfaction in major and self leadership.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.655-658
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• 2011

기초의학 강의 요원의 부족은 교육에 대한 부담과 연구활동 위축이라는 이중고를 초래하고 있다. 기초의학 강의의 효율성을 높이기 위하여 다양한 연구 및 해결책이 제시되어 왔으며, 통합강의 역시 그 대안의 하나로서 대두되고 있다. 따라서 본 연구에서는 새롭게 부각되고 있는 기초의학 통합강의에 대한 가상강의(cyber lecture) 적용의 실효성과 타당성을 설문조사와 교과목 운영의 경험을 중심으로 분석하였다. 설문조사에 대해 학생들은 가상강의의 내용, 난이도, 진행 및 멀티미디어 컨텐츠 등에 대해 대체로 만족스러운 의견을 제시하였다. 또한 가상강의가 통합강의 운영을 보완해주는데 효율적일 것이라는 의견과 더불어, 향후 통합강의에서 가상강의의 비중을 학대할 필요성에 대해서도 찬성의견이 반대의견보다 지배적임을 알 수 있었다. 뿐만 아니라, 통합강의 실습의 일부분을 가상강의에서 운영하는 방안에 대해서도 대체로 긍정적이었다. 통계분석 결과, 가상강의에 대해 긍정적이거나 부정적인 의견들은 기초신경학 통합강의 성적이 우수한 학생과 보통이하인 학생들 사이에 유의한 차이를 보이지 않았으나 (${\chi}^2$ 검증 결과), 성적이 우수한 학생일수록 가상강의의 효율성에 대해 긍정적이라는 경향은 알 수 있었다(Spearman 등위상관계수를 산출한 결과). 본 연구결과를 통해 제시된 개선방안과 축적된 경험을 바탕으로 점차 가상강의의 비중을 높이고 강의교수들 간의 유기적 협조가 이루어진다면 가상강의는 향후 기초의학 통합강의 운영의 새로운 패러다임(paradigm)이 될 것으로 사료된다.

• Journal of Preventive Medicine and Public Health
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• v.29 no.2 s.53
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• pp.255-264
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• 1996

To study reliability and validity of PWI, this newly developed self-administered questionnaire which measures stress, was given to medical students. All respondent(133) were followed 4 weeks later and 92 were retested. Cronbach's $\alpha$ coefficient of data was 0.93. Test-retest reliability measured by Pearson's correlation coefficient was 0.72(P<0.01). Exploratory factor analysis(EFA) performed by principal axis factor method without iteration and by varimax rotation explored 13 principal components(eigenvalues > 1). After exploring 4 factor structure according to previous study results, factor 1 showed good agreement but other factors did not. Confirmatory factor analysis(CFA) showed poor fit of 4 factor model to data. In the further study, it may be considered to model that has unidimensional factor structure.

• Journal of Convergence for Information Technology
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• v.8 no.2
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• pp.11-18
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• 2018

The purpose of this study was to analyze the effects of Socio-demographic Characteristics, perceived stress and depression of college students in Daegu and Kyungbuk provinces on problem drinking behavior. The subjects of the study were 295 college students who understood and agreed on the purpose of this study and conducted questionnaires using structured questionnaires. Data were analyzed with frequency, percentage, mean, standard deviation, t-test, ANOVA, Scheffe test, pearson correlation coefficient, and multiple regression analysis. The results showed that depression was the most influential factor in the problem drinking behavior of college students in Daegu and Kyungbuk provinces, followed by gender, academic performance, and residental type. Therefore, it is necessary to develop an intervention program that takes into account the social psychological approach to prevent depression of college students and the characteristics of gender, academic performance, and residental type in order to prevent problem drinking of college students.

• Journal of Convergence for Information Technology
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• v.8 no.3
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• pp.127-136
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• 2018

This study was to identify factors influencing satisfaction on clinical practice of dental hygienist students located in G, J region. The data was analyzed by t-test, Anova, Pearson correlation coefficient, and multiple regression using SPSS 21.0 program. There were significant in satisfaction of score(F=2.925, p<.05), perceive heath status(F=8.108, p<.001), satisfaction on department(F=8.198, p<.001). The relationship on peers with score(r=.277, p=.01) and perceive health status correlations with relationships on peers(r=.327, p=.01), The satisfaction on clinical practice had positive correlations with score(r=.127, p=.05), perceive health status(r=.226, p=.01), relationship on peers(r=.240, p=.01). The factors influencing satisfaction on clinical practice were satisfaction of relationship on peers, satisfaction of department, perceive health status. The results suggest that development of program to improve satisfaction on clinical practice of dental hygiene students.

• Journal of Korean Society of Forest Science
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• v.110 no.4
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• pp.530-542
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• 2021

To establish the basic unit for the ecological management of the Larix kaempferiplantations in the Baekdudaegan protected area, we classified the vegetation types using TWINSPAN and DCA ordination analysis based on the vegetation information collected from 119 plots and analyzed their spatial arrangement status. Vegetation types were classified into seven types, including Quercus mongolica-Rhododendron schlippenbachii type, Q. mongolica-Lespedeza maximowiczii type, Cornus controversa-Morus australis type, Q. mongolica-Carpinus cordata type, Lindera erythrocarpa-Rosa multiflora type, Q. serrata-Zanthoxylum schinifolium type, and Q. serrata-Sasa borealis type and they have usually reflected differences in the floristic composition according to latitude, elevation, establishment period, operation history, characteristics of the surrounding stands, and degree of disturbance. Furthermore, using the Jaccard coefficient to comparethe floristic composition similarity between Larix kaempferiplantations and surrounding potential natural vegetation (Q. mongolica and Q. serrata forests), although some differences depended on vegetation types, it was 0.21 on average with Q. mongolica forest and 0.32 with Q. serrata forest, indicating that the floristic composition was still heterogeneous.

• The Korean Journal of Nuclear Medicine
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• v.34 no.1
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• pp.74-81
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• 2000

Purpose: The purpose of this study was to develop in vivo dosimetries using both chromosomal aberrations and micronuclei in mice to assess biological effects of radiations. Materials and Methods: Five each mice were irradiated with 0, 1, 2, 3, 4, 5, 10 Gy of Cs-137 gamma-rays. We scored numbers of chromosomal aberrations in metaphase spreads and numbers of micronuclei in bone marrow smears under light microscope, and obtained the dose-response relationships. We also examined the relationship between the two dose-response curves. Results: The frequency of both chromosomal aberrations and micronuclei increased with dose, in a linear-quadratic manner The delta, beta, and alpha coefficients were 0.0176, 0.0324, and 0.0567 for metaphase analysis (r=1.0, p<0.001) and 0.0019, 0.0073, and 0.0506 for micronuclei assay (r=1.0, p<0.001). The frequency of chromosomal aberrations and micronuclei in different radiation doses was significantly correlated (r=0.99, p<0.01). Conclusion: In vivo dosimetry using either metaphase analysis or micronucleus assay was feasible in mice. These methods could be useful to evaluate biological effects of radiation.

• Journal of Animal Science and Technology
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• v.51 no.4
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• pp.321-328
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• 2009

A total of fourteen, 1-wk-old male Holstein calves were allotted into two groups consisted of control (CON) and IGY which was orally administrated with immunoglobulin yolk (IgY) for 1wk. Calves in both groups were provided with milk replacer according to feeding program and had ad libitum access to timothy hay for the entire experimental period (7wks). At 0, 7 and 49 day of experiment, blood samples were collected from the jugular vein of calves to investigate blood biochemical profiles and the differential count (%) of white blood cell (WBC). We also monitored growth performance and colony forming unit (CFU) of fecal microbial population in calves. The adminstration of IgY in calves did not affect body weight and weight gain during 49 days feeding trial compared with control group. The CFU of E. coli and Lactobacilli in the feces of calves were not significantly affected by IgY treatment, whereas the score of the calf scours during day 43 to 49 in IgY group showed a significant (P<0.05) solid type. There were no differences in plasma biochemical components including total protein, albumin, immunoglobulin and the other indicators. As for WBC differential count (%), there was no statistical difference in the percentages of neutrophil, lymphocyte, monocyte, eosinophil and basophil at 0, 7 and 49 days after the oral supplementation of IgY. In conclusion, the oral supplementation of IgY as an immunostimulant did not affect growth performance, fecal microbial population, blood biochemical profile and WBC differential count in Holstein calves.

• Solar Energy
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• v.15 no.3
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• pp.75-90
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• 1995

This paper is concerned about alternative refrigerants for HCFC22 used in room air conditioners and heat pumps. Computer simulation of residential air conditioners using refrigerant mixtures is carried out. Following refrigerants are selected as the pure refrigerants constituting the mixtures studied: R32, R124, R125, R134, R134a, R143a and R152a. Simulation results are presented fur the following mixtures: R32/R134a, R32/R152a, R32/R134, R32/R124, R143a/R134a, R143a/R152a, R143a/R124, R125/R134a, R125/R152a, R125/R124, R32/R152a/R134a, R32/R152a/R134, R32/R152a/R124. The best fluid is found to be the ternary mixture of R32/R152a/R124. For that mixture, the coefficient of performance(COP) and volumetric capacity for refrigeration(VCR) are 13.7% larger and 23% smaller than the respective values for HCFC22. R32/R124 mixture is the best binary fluid pair whose COP and VCR are 13.4% larger and 9.6% smaller than those for HCFC22.