• Journal of The Korean Society of Agricultural Engineers
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• v.55 no.2
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• pp.77-85
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• 2013

The aim of this study is to investigate strength and water purification characteristics of effective microorganism-applied volcanic ash block using flexural strength test and water quality analysis. The specimens were prepared with volcanic ash from Mt. Baekdusan and Mt. Hallasan, and cement as the ratios of 3.5:1, 4.0:1, 4.5:1, 5.0:1 with and without metakaolin. Flexural strength degraded with increasing of the amount of volcanic ash, and increased with addition of metakaolin as a binder. Based on these results, the optimal ratio for fabricating volcanic ash-cement mixture block is determined as 3.5:1 with metakaolin. Furthermore, from water quality analysis on contaminated water, removal ability of effective microorganism-applied volcanic ash-cement mixture block and caged volcanic ash block against T-N, T-P and SS was highly evaluated because of adsorption due to the large specific surface area of volcanic ash. Hence, volcanic ash-cement mixture block and caged volcanic ash block possibly contribute to water purification.

• Journal of Korean Library and Information Science Society
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• v.45 no.2
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• pp.5-27
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• 2014

This study aims to investigate the relationship between university library usage and educational achievement of academic library users. To proceed with this study, academic library usage data were collected from S university undergraduate students. Academic achievement was measured using the students' grade point average(GPA). T-test and analysis of variance were used to compare differences of means between library usage and academic achievement with the background variables. Hierarchical regression analyses were conducted to determine the association between library usage and academic achievement. As a result, a positive correlation was found between academic achievement and the use of library resources and services according to gender, year and academic subject. In addition, academic library usage had a positive significant influence on academic achievement. Students who used more library resources and facilities ultimately get better grades.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.10b
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• pp.43-46
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• 2003

Prediction of final microstructures after high temperature forming of Ti-6Al-4V alloy was attempted in this study. Using two typical microstructures, i.e., equiaxed and $Widmanst\ddot{a}tten$ microstructures, compression test was carried out up to the strain level of 0.6 at various temperatures $(700\~1100^{\circ}C)$ and strain rates $(10^{-4}\~10^2/s)$. From the flow stress-strain data, parameters such as strain rate sensitivity (m) and activation energy (Q) were calculated and used to establish constitutive equations for both microstructures. Then, finite element analysis was performed to predict the final microstructure of the deformed body, which was well accorded with the experimental results.

• Journal of Ecology and Environment
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• v.33 no.4
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• pp.307-315
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• 2010

Males of the field cricket Teleogryllus emma produce calling songs that are attractive to receptive females. The calling songs of T. emma consist of two components, the long chirp that is composed of up to 12 single pulses, followed by a variable number of short chirps. Based on the analysis of coefficient of variation (CV), temporal characters of the long chirp were less variable than those of the short chirps in male calling songs. To test for phonotactic selectivity of females, we conducted a single-stimulus playback experiment in which five stimuli (standard, long chirp only, long chirp augmented, short chirps only, and short chirps augmented) were used. The standard stimulus included both long and short chirps whose characteristics were derived from the calling songs of field populations. Results of the playback experiment showed that female crickets oriented more frequently toward the stimuli that included the long chirp (standard, long chirp only, and long chirp augmented stimuli) than toward the stimuli lacking the long chirp (short chirps only and short chirps augmented stimuli), indicating that the long chirp in the calling songs was required to elicit positive phonotaxis in the female crickets. The result of CV analysis of the male calling songs and the findings of the female phonotaxis experiment suggested that the long chirp of calling songs may play a role in species recognition in T. emma.

• Journal of the Korean Home Economics Association
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• v.39 no.8
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• pp.67-80
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• 2001

The purpose of this research was to find the relationships between use of computer games, computer game addiction and middle school boy's aggression. The subjects were 511 boys of 2 middle schools in Kwang-ju, Korea. The method was self-reporting questionnaire. For data analysis, frequency distribution, percentage, Cronbach's u coefficient were estimated. ANOVA, Duncan test, Pearson's coefficient, and multiple regression analysis were used. The major findings of the research are as follows ; First, most boys(91.4%) play computer game more than once in a week. And have over 2 years computer game experience. Second, computer game addiction score and aggression score, in general, tend to be below the mean scores. Third, boys who play computer game activities of high frequency, start play computer game at earner age, spent playing longer times of computer game, and like more on-line game were addicted to the computer game more than who don't. And boys who spent playing long times on computer game were more aggressive than who don't. Fourth, the influencies of computer game activities variables on aggression were not found significantly. But the influencies of computer game addiction were found significantly.'Negative sentiment $.$ sociality' was the most influencial variable on aggression. The influncies of 'Distortion of the reality'and 'Lost of self-control' was followed.

• Journal of the Korean Home Economics Association
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• v.50 no.1
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• pp.51-63
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• 2012

The purpose of this study was to investigate the effect of appearance management cognition on attitude toward appearance management and the effect of this attitude on appearance management behavior. It also examines how demographic factors affect these relationships. This study gave a questionnaire survey to adults between the ages of 40 and 50 in Seoul, Daegu, and Ulsan, South Korea. Data collected from 368 respondents were analyzed using descriptive statistics, t-test, factor analysis, and structural equation modeling. The study model was tested by structural equation modeling, the results of which revealed a positive effect of appearance management cognition on attitude toward appearance management and a positive effect of attitude toward appearance management on appearance management behavior. The results of t-testing showed that there were significant differences in cognition, attitude, and behavior toward appearance management by gender, age, educational level, and income.

• Journal of the Society of Naval Architects of Korea
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• v.49 no.6
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• pp.541-549
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• 2012

The study adopted a freezing prevention method of the upper deck which used heating coil, and carried out numerical analysis by using ANSYS 13.0 CFD for design guide of the vessel operating in cold region. It is based on the experimental results of the anti-icing performance tests which were carried at cold room chamber in MOERI. Numerical analysis for the design guide was performed by considering S.S.T. (Shear Stress Transport) turbulent model for flow separation effects and the turbulence which occurred in interfaces of the numerical model in order to express appropriate heat transmission phenomenon. The numerical result shows average temperature of the upper deck surface appeared similarly compared with the indoor chamber test. The design guide for optimum freezing prevention presented through heat transmission capability and interval of the heat coil in various outdoor temperature($10^{\circ}C{\sim}-30^{\circ}C$) and wind speed(1m/s~7m/s).

• Journal of Korean Public Health Nursing
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• v.20 no.2
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• pp.183-194
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• 2006

Purpose: The purpose of this study was to investigate student nurses' knowledge and attitude related to the elderly. Method: The data were collected from 519 student nurses studying in university by means of a structured questionnaire. The data were analyzed using descriptive analysis, t-test, one-way ANOVA, and Pearson correlation analysis by SPSS version 10. Results: The average score of the respondents' knowledge of the elderly was 12.02(${\pm}2.77$) out of 25. The average score of the respondents' attitude toward the elderly was 80.09(${\pm}11.69$) out of 140. There was a statistically significant difference in the respondents knowledge of the elderly depending on their degree of preference for giving nursing care to the elderly (F=7.534, p=.001). There was a statistically significant difference in the respondents attitude toward the elderly depending on their degree of preference for giving nursing care to the elderly (F=23.167, p=.000), possession of living grandparents (F=6.174, p=.002), and degree of interaction with elderly (t=5.661, p=.000). Student nurses' knowledge and attitude related to the elderly were significantly correlated. Conclusion: It is necessary to develop a program for continuous teaching and education that will help increase student nurses' knowledge of the elderly and thereby positively change their attitude toward the elderly.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.11 no.1
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• pp.59-66
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• 2004

Purpose: The purpose of this study was to investigate the relationship between eating disorder, self-esteem and depression in college women. Method: Participants were 282 college women. Data were collected between Nov. 1st and 30th, 2003, and provide basic data on eating disorder levels in college women and basic data for health control programs. The instrument was a questionnaire consisting of 8 items on general characteristics and weight control, 24 on eating disorders, 10 on self-esteem and 10 on depression. Analysis of the data was done using numbers, percentages, means and standard deviations, t-test and Pearson correlation coefficients. SPSS WIN 10.0 was used in data analysis. Result: The greatest difference for eating disorders was between the group with normal body weight and the group with low body weight (t=-6.94, p=.000). There was a high positive correlation between Body Mass Index and eating disorder (r=.383, p<.01), between eating disorder and depression (r=.161, p<.01). There was a high negative correlation between eating disorder and self-esteem (r=-.196, p<.01), and between self-esteem and depression (r=-.537, p<.01). Conclusion: These results indicate that college women need more education and counseling on dietary concerns. Also, systematic efforts to establish a more health conscious social standard for beauty should be taken. Further empirical and experimental studies are required to investigate factors influencing attitudes towards eating held by college women and to determine variables which affect various specific dimensions of these attitudes.

• Journal of the Korean Chemical Society
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• v.55 no.4
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• pp.620-625
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• 2011

A simple, rapid potentiometric back titration of Isoniazid (INH) in the presence of Rifampicin (RIF) in tablets and syrups is described. The method is based on the oxidation of INH by a known excess of copper (II) ion and the back titration of unreacted copper (II) ion potentiometrically with ascorbic acid using a lab-made Copper Based Mercury Film Electrode (CBMFE). The titration conditions have been optimized for the determination of 1.0-10.0 mg of INH in pure and dosage forms. The precision and accuracy of the method have been assessed by the application of lack-of-fit test and other statistical methods. Interference was not caused by RIF and other excipients present in dosage forms. Application of the method for INH assay in tablets and syrups was validated by comparison of the results of proposed method with that of the British Pharmacopoeia (BP) method using F- and t- statistical tests of significance.