• Environmental Analysis Health and Toxicology
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• v.8 no.3_4
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• pp.7-12
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• 1993

An Actinomycete strain isolated from Mt. Dea-Dun had a strong antifungal activity. The culture brith produced by isolated strain showed only antifungal activity against fungi with the exception of yeast and bacteria. It was heat stable, dissolved in ehtylacetate. The concentrated antifungal agent showed cytotoxicity against HEP-2 and HeLa as tumor cell line, and showed weak cytotoxicity against VERO 36 as normal cell line. Morphological and physiological characteristics were tested with isolated strain. The spore color of isolated strain was gray. It had a short chain and produced brown colored lytic substance in yeast extract-malt agar. The cell wall of isolated strain was composed of meso-DAP, and we suggested it as genus Actinomadura. In the existing of chemical inhibitor, isolated strain grew on the condition of 0.0001% crystal violet, 0.1% phenol, 0.01% sodium azide and 10% sodium chloride. Carbon utilization of isolated strain was shown that glucose, sucrose, manitol and sodium citrate were well utilized.

• Journal of the Korean Society of Food Science and Nutrition
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• v.15 no.1
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• pp.90-97
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• 1986

Timing of weaning is later in Korean rural and lower urban classes compared with middle and upper classes. Weaning after the international standard of six months of age has adverse effects on the growth rate of children. This occurs because supplementary foods are not provided for the child during the weaning period; rather, the infant goes directly from nursing(or bottle feeding) to the cereals and solid foods of the adult diet. Consequently, all nutrient and calorie intake, with the exception of thiamin, in Korean rural children had not yet attained the Recommended Dietary Allowance (RDA). This situation bas created an urgent need for easy to prepare, low priced. highly nutritious supplementary foods. The research team of Yonsei University developed 3 formulas prepared from rice, soybeans, sesame, dry skim milk and fish which are all plentiful and inexpensive items in Korea. A proximate analysis and amino acid determination were performed on three formula. These formulas were prepared and used as exprimental diet for an animal assay. In the animal assay, growth rate, PER evaluated and biochemical analyses were also carried out. A safety storage assay and the cost evaluation were also conducted.

• Journal of Korean Elementary Science Education
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• v.25 no.2
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• pp.149-158
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• 2006

The purpose of this study was to analyze the analogies used in elementary science textbooks. For this, the analogies were classified into the following criteria : analogy-related contents included in elementary science text-books, types of representation style, and the role of analogy. The results of this study were as follows : the total of analogies was 154 in the 6th and 166 in the 7th curriculum. Most of them were expressed in textbooks and experimental texts. More structural/functional, verbal/pictorial, concrete/concrete, concrete/abstract, simple and enriched analogies were included in the science textbooks of the 7th than those of the 6th. Most of them took the role as an aid to understanding. According to the domain of science content, energy, material, life domains were increased in the 7th than the 6th, with the exception of the earth science domain. The ratio of used analogies in the life domain was higher than the others, and in the material domain it was the lowest. From these results, it can be said that, in order to help students' understanding, further research into the application of analogies is needed.

• Journal of Korean Academy of Nursing Administration
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• v.22 no.2
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• pp.158-166
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• 2016

Purpose: This study was done to investigate the influence of organization and community job embeddedness on turnover intention of nurses in small and medium sized general hospitals. Methods: The participants, 333 nurses, were recruited from small and medium sized general hospitals in Korea. Data were collected by self-report questionnaires on job-embeddedness and turnover intention and were analyzed using descriptive statistics, Independent t-test, One-way ANOVA and $Scheff{\acute{e}}^{\prime}$, Pearson correlation coefficient, and multiple linear regression analysis with the SPSS 18.0 program. Results: The score for job embeddedness and it's 6 factors, and turnover intention were above 3 on a 5 point scale with the exception of organizational sacrifice. There was a significant difference in turnover intention according to age, marital status, salary, and position. There were significant negative correlations between the 6 factors of job embeddedness and turnover intention. Variables entered in multiple regression showed that organizational sacrifice, organizational fit and age were significant contributing factors to turnover intention. Conclusion: The findings suggest that there is a need for strategies to enhance job embeddedness, especially organization sacrifice and organization fit. These factors should be developed and used to decrease turnover intention of nurses in small and medium sized general hospitals.

• Journal of The Korean Astronomical Society
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• v.41 no.1
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• pp.7-15
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• 2008

We carried out a set of simulations to reproduce the performance of wide-field NEO surveys based on the revised population model of Near Earth Objects (NEOs) constructed by Morbidelli (2006). This is the first time where the new model is carefully compared with discovery statistics, and with the exception of population model, the simulation is identical to the procedure described in Moon et al. (2008). Our simulations show rather large discrepancy between the number of NEO discoveries made by the actual and the simulated surveys. First of all, unlike Bottke et al. (2002)'s, Morbidelli (2006)'s population model overestimates the number of NEOs. However, the latter reproduces orbit distributions of the actual population better. Our analysis suggests that both models significantly underestimate Amors, while overestimating the number of Apollos. Our simulation result implies that substantial modifications of both models are needed for more accurate reproduction of survey observations. We also identify Hungaria region (HU) to be one of the most convincing candidates that supply a large fraction of asteroids to the inner Solar System.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.645-648
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• 2017

The existing embedded tester used TCP and shared file system for log processing. In addition, the existing processing method was treated as 1-N structure. This method wastes resources of the tester for exception handling. We implemented a log processing message layer that can be distributed by messaging system. And we compare the transmission method using the message layer and the transmission method using TCP and the shared file system. As a result of comparison, transmission using the message layer showed higher transmission bandwidth than TCP. In the CPU usage, the message layer showed lower efficiency than TCP, but showed no significant difference. It can be seen that the log processing using the message layer shows higher efficiency.

• Journal of the Economic Geographical Society of Korea
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• v.11 no.3
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• pp.476-491
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• 2008

In the era of globalization, the number of international students are rapidly increasing. Korea is no exception. For a long time Korea has been one of the major countries in terms of students' outward migration at university-level, but recently the inward migration is also increasing so as to change the situation. First, this paper deals with theoretical aspects of international students' flows and reviews recent research achievements on those. Second, the paper describes the overall condition of international students in Korea using statistical data. Finally, this paper examines characteristics and backgrounds of international students in Korea.

• Journal of the Korean Home Economics Association
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• v.39 no.6
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• pp.123-133
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• 2001

The purose of this study was to investigate the effect of clothing image, benefit sought, perceived risk, demographic and consumer's characteristics on the Purchase Intention of Saenghwal-Hanbok. The questionnaire was administered to 227 women in Seoul Data were analysed by factor analysis, correlation and multipleregression. The resets of this study were as follows: 1. The clothing images of Saenghwal-Hanbok were composed of dignified, comfortable, conservative and innovative dimensions. The benefits sought of Saenghwal-Hanbok were identified to traditional aethetics, contemporary aethetics, comfortability The perceived risk of Saenghwal-Hanbok was the only risk on the negative viewpoint of others. 2. The images of Saenghwal-Hanbok with the exception of innovative image have influenced on the benefit sought and the perceived risk of Saenghwal-Hanbok. 3. The positive effects of benefits sought iud negative effect of perceived risk ell the purchase intention of Saenghwal-Hanbok were found. There were also the significant effects of demographic and consumer's characteristics on the clothing image, benefit sought, perceived risk.

• Journal of the Korean Home Economics Association
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• v.34 no.3
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• pp.47-57
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• 1996

Ther purpose of this study was to investigate the perceptual differences in brand images of national medium-low price casual clothing according to purchase volume and brand loyalty. Additionally, differences between Seoul and County of Chungnam in purchase volume of each brand of medium-low priced casual, information source and companion in purchasing the brands were analyzed. The questionnaires were administered to 540 college student living in Seoul and County of Chungnam, and the method used to analyze the data were frequency, factor analysis, and t-test. The results were as follows: 1) Perceptual mapping showed that preference ranks among the six brands were same regardless of purchase volume and brand loyalty, but heavy users and loyal consumers to medium-low priced casual brands had more favorite brand image than light users and non loyal consumers. 2) Those who live in County of Chungnam purchased all six brands more than those who love in Seoul with the exception of Hunt. Information sources such as catalogs and celebrity were more used in County of Chungnam. Most accompanied shopping alone both in Seoul and County of Chyngnam, however family members were more influential in Seoul, whereas the same sex friends were in County of Chyngnam.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.637-640
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• 2011

Recently, rapid spreading of smart-phone make an expectation for increase of practical application for MANET(Mobile Ad-Hoc Network) which is not used infrastructure like as base-station. One of important application for MANET will be VoIP(Voice over Internet Protocol) known as Internet telephony. On the other hand, information intrusions causing serious problems is not allowed exception of MANET. Especially, there are some dangerous problems of intrusions to MANET, differently to other networks, because of it's usage of military purpose or emergency application of rescue. In this paper, to analyze this intrusion problem on MANET with blackhohe attacks, effect of intrusion to transmission performance is studied. VoIP traffic is assumed as an application service on MANET, computer simulation with NS-2 is used for this analysis.