• Journal of the Korean School Mathematics Society
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• v.15 no.3
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• pp.487-509
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• 2012

This study, in order to contribute to improvement of the affective domain for mathematics which is one of the largest issues of mathematics education, examined the background variables influencing mathematics anxiety of middle/high school students. As the result, the middle school students showed a greater level of anxiety than the high school students did, and especially the anxiety level according to environment factor and learning strategy factor was high. Also, male students showed overall a greater mathematics anxiety than female students did, and both group of students showed a higher anxiety level according to environment factor and learning strategy factor. Besides, the greater the time spent on private education was, the higher the mathematics anxiety level, and in test/performance factor, the group with low self-initiated learning time showed a higher level of mathematics anxiety compared to other two groups. Among four subfactors of mathematics anxiety test, the students overall scored lowest in anxiety for test/performance factor, and highest in environment factor.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.40 no.3
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• pp.107-115
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• 2017

The purpose of this study is to find and compare the differences in stress level, stressor, and coping style of high school students according to their personality traits. And to identify the personality traits contributing to stress reduction. The results of the study can be used as basic data for reducing the stress of adolescents to improve their academic achievement and maintain mental and physical stability. The questionnaire survey was conducted for 10 days from June 7 to June 16, 2017 for S high school students in Chungbuk Province. The study employed four measuring instruments as Ego-gram, Ok-gram, stressor scale, and stress coping type scale. Individual personality traits were classified into ego-states and ok-states in TA (Transactional Analysis). Stressors are classified into 5 categories (school life, home life, human relationship, myself, environment) and stress coping styles are classified into 4 categories (problem-focused coping, social-support coping, feeling-focused coping, hope-thinking coping) used in the previous studies. The collected data were analyzed using T-test, ANOVA, and multiple regression analysis. As a result, the stress level of high school students showed significant differences according to sex, year, grade, sleeping time, personality traits, and coping styles. Personality traits that contributed to the stress increase were NP, AC, 'you positive', 'i negative' and personality trait that contributes to stress reduction is 'you negative.' Therefore, we can judge that individual personality traits have significant effects on stress level, stressor, and coping style and need to find the effective stress management method suitable for individual personality traits using counseling, repetition training, self-suggestion etc.

• Journal of The Korean Association For Science Education
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• v.5 no.2
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• pp.89-97
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• 1985

The measurement tad of student's attitudes towards secondary school science had been developed according to the scheme of categories of science education object by Klopfer. Sixteen background factors of student had been chosen in order to find out a difference in student's attitudes towards secondary school science for each background factor. The twenty-eighth grade student's attitudes towards secondary school science in the Province of Chung Cheong Buk Do had been investigated by the developed tool. The findings were as follow: 1. On the whole the investigated students had favorable attitudes towards secondary school science. 2. The adoption of scientific attitudes and favorable attitudes towards science and scientists were the best affirmative attitudes. 3. The correlation between enjoyment of science learning experiences and development of interest in pursuing a career in science was the highest level. 4. The seven of sixteen background factors-sex, interest in science, science mark, location of residence, sat sifaction level at science learning, familiarity level with the name of scientific instruments and intended job-affected studentss attitudes towards secondary school science.

• Geomechanics and Engineering
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• v.30 no.2
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• pp.201-210
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• 2022

This paper presents a study regarding the influence of various water levels on the characteristics of subgrade mud pumping through a self-developed test instrument. The characteristics of mud pumping are primarily reflected by axial strain, excess pore water pressure, and fine particle migration. The results show that the axial strain increases nonlinearly with an increase in cycles number; however, the increasing rate gradually decreases, thus, an empirical model for calculating the axial strain of the samples is presented. The excess pore water pressure increases rapidly first and then decreases slowly with an increase in cycles number. Furthermore, the dynamic stress within the soil first rapidly decreases and then eventually slows. The results indicate that the axial strain, excess pore water pressure, and the height and weight of the migrated fine particles decrease significantly with a low water level. In this study, when the water level is 50 mm lower than the subgrade soil surface, the issue of subgrade mud pumping no longer exist.

• Journal of the Korean Society of School Health
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• v.16 no.2
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• pp.111-123
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• 2003

The purpose of this study was to identify the expectation about school health program of primary school parents as an important variable for growth of school health program fore area locked primary school parents 631 by self-administered questionnaire between June 20 and September 29, 2001 The results were as follows 1. General characteristic of the Subjects Age rates of the subjects were 45.5% on 35~39 years old and 34.7% over 40 years old. Economic status were middle level 86%, participation rates of school health education for parent were 16.8%, recognition rates on significance of school health education were 89.9%. 2. Health knowledge of parents The mean score on health knowledge of the subjects was 6.8 from a total of 10. there was a statistically significant difference with regard to health knowledge among the 7school(F=3.46, p=.016). 3. Health behavior of parents The mean score on health behaviors of the subjects was 77.3 from a total of 100. there was no statistically difference in health behavior among the school. 4. The expectation about school health program of the parents The mean score on the expectation about school health program of the subjects was 51.1 from a total of 140. there was a statistically significant difference with regard to the expe ctation about school health program among the school(F=3.75, p=.010). 5. Health behaviors and the expectation about school health program from sociod emogr aphic Backgrounds of the Subjects. In the backgrounds of the subjects, the score on health behavior was higher the mothers(t=2.89,p=.004), the upper class(F=7.38, p=.000), the higher participation level of school health education of parent(F=7.38, p=.000) and the higher recognition level on significance of school health education of parent(F=9.94, p=.000). The score on the expectation about school health program was higher the lower recognition level on significance of school, health education of parent and on the expectation about health screening & preventive services was significant difference by age. however, the difference was not significant in the others.

• The Mathematical Education
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• v.54 no.1
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• pp.49-63
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• 2015

PISA 2012 showed that while Korean students achieved high-level math achievement in mathematics their levels are relatively lower in math self-efficacy. Students from Singapore, on the other hand, achieved high scores both in math achievement and in math self-efficacy. The results of the two countries differed although both countries has been sharing the same East Asian cultural sphere. This study analyzed the input and the process variables on the student- and school-level concerning math self-efficacy. The results were as follows. In Korea, math interest, instrumental motivation, elaboration strategies, applied and pure math tasks were the student-level variables that affected math self-efficacy. In Singapore, math interest, control strategies, elaboration strategies, applied and pure math tasks were the student-level variables that affected mathematics self-efficacy. Math club, teachers' low expectations were the school-level variables that affected math self-efficacy. For a higher-level of math self-efficacy in Korea, it is important to encourage students not only to use control strategies, but to participate in math clubs. It is equally important for teachers to have higher expectations towards students.

• The Mathematical Education
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• v.41 no.2
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• pp.139-155
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• 2002

In this paper we represented the results of surveying on the present condition of mathematics education and the contents of the mathematics text books that are usually taught in Art High Schools interest in mathematics subjects and to achieve the higher level of mathematical abilities. We would like to raise their interest in mathematics and to improve the efficiency of teaching level on the basis of the 7th Mathematics Curriculum Revision. Some suggestions are of offered by considering the level of their mathematical abilities in Art High Schools and the present contents of the mathematical subjects from following views ⑴ the aspect of studying method ⑵ the aspect of revising contents of mathematics textbooks for them ⑶ the aspect of educational policies for Art High Schools

• Journal of Fisheries and Marine Sciences Education
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• v.20 no.1
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• pp.1-11
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• 2008

The purposes of this study are to analyze sex education content in high school textbooks and to suggest new guidelines for high school sex education content from a gender equality standpoint. The study analyzes sex-related content from high school textbooks based on the 7th curriculum, including subject areas such as Technical/Home Economics, Sciences, Physical Education, Social Studies and Moral Studies. The analysis relies on the framework of Sexuality Information and Education Council of the United States that covers 4 levels and 6 categories as well as the framework of Choi (2005) that includes 36 themes in 6 different categories. The results of this study are as follows: First, high school sex-related textbooks are focused mainly on human development and human relations. Secondly, there is a lot of level 3 sex education content within the analyzed textbooks. Third, there are gender inequality issues in the coverage of such topics as pregnancy, contraception and sexual violence. Fourth, there are also gender inequality problems caused by content level. This study recommends that gender inequality issues be included in high school sex education guidelines in the future in order to provide improved and appropriate content for high school level sex education.

• Clinical and Experimental Pediatrics
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• v.60 no.2
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• pp.45-49
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• 2017

Purpose: Serum level of 25-hydroxyvitamin D (25-OHD) is considered as the most appropriate marker of vitamin D status. However, only a few studies have investigated the relationship between 25-OHD and parathyroid hormone (PTH) in children. To this end, this study was aimed at evaluating the lowest 25-OHD level that suppresses the production of parathyroid hormone in children. Methods: A retrospective record review was performed for children aged 0.2 to 18 years (n=193; 106 boys and 87 girls) who underwent simultaneous measurements of serum 25-OHD and PTH levels between January 2010 and June 2014. Results: The inflection point of serum 25-OHD level for maximal suppression of PTH was at 18.0 ng/mL (95% confidence interval, 14.3-21.7 ng/mL). The median PTH level of the children with 25-OHD levels of <18.0 ng/mL was higher than that of children with 25-OHD levels ${\geq}$ 18.0 ng/mL (P<0.0001). The median calcium level of children with 25-OHD levels<18.0 ng/mL was lower than that of children with 25-OHD levels${\geq}18.0ng/mL$ (P=0.0001). The frequency of hyperparathyroidism was higher in the children with 25-OHD levels<18.0 ng/mL than in the children with 25-OHD levels${\geq}18.0ng/mL$ (P<0.0001). Hypocalcemia was more prevalent in the children with 25-OHD levels<18.0 ng/mL than in the children with 25-OHD levels${\geq}18.0ng/mL$ (P<0.0001). Conclusion: These data suggest that a vitamin D level of 18.0 ng/mL could be the criterion for 25-OHD deficiency in children at the inflection point of the maximal suppression of PTH.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.493-495
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• 2008

A new three-level resonant converter suitable for wide input variation is proposed. A hybrid combination of a three-level converter controlled by phase-shift modulation and a half-bridge converter is presented. Since the voltage of each switch is one half of the input voltage, it has advantages of the choice and characteristics of switches. The ZVS operation of the converter is achieved by using the magnetizing current of the transformer. To verify the theoretical analysis, experimental results of the proposed converter are presented.