• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.43 no.2
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• pp.1-8
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• 2011

The presence of high silica in bamboo hinders the use of this material for production of rayon grade pulp. Research has been carried out to overcome this deficiency and improve quality of rayon grade pulp with the modification in pulping and bleaching process. Effect of acid boosted water prehydrolysis, sulphuric acid pre-treatment of unbleached pulp, chlorination stage at lower pH and treatment of bleached pulp with $SO_2$ water were evaluated. Acid boosted water prehydrolysis of chips reduces prehydrolysis time by 50 minutes as compared to water prehydrolysis. Treatment of unbleached pulp with sulphuric acid reduces ash, acid insoluble, silica, calcium and iron contents of the pulp by 56, 31, 82, 84 and 60% respectively. The addition of acid, increase in kappa factor in $C_D$ stage and combination of both were effective in removing silica in the pulp. Treatment of final bleached pulp with $SO_2$ water removes silica to a great extent and improves optical properties of the pulp as compared to $H_2SO_4$ or PAA. Pretreatment of the pulp with acid and modification in the bleaching process can reduce silica substantially and improve the quality of rayon grade bamboo pulp.

• Journal of Families and Better Life
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• v.33 no.5
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• pp.117-131
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• 2015

The purpose of this study was to investigate the difference of adolescent self-conscious emotion, empathy, forgiveness and prosocial behavior across gender and grade, to analyze the difference between the correlations among prosocial behavior and other variables across gender and grade, and to investigate the effects of adolescent self-conscious emotion, empathy, forgiveness on prosocial behavior in each gender and grade group. The subjects were 272 adolescents who were recruited by purposive sampling in the Chungbuk area. The results indicated that the empathy of girls was higher than that of boys. Boys showed a stronger correlation between prosocial behavior and guilt than girls. Next, boys' prosocial behavior was predicted by cognitive empathy, guilt, and pride, whereas girls' prosocial behavior was predicted by forgiveness toward others, pride, cognitive empathy and emotional empathy. Last, middle school students' prosocial behavior was predicted by pride and guilt, whereas that of high school students' was predicted by cognitive empathy, guilt, pride, and forgiveness toward others and the situation. In conclusion, self-conscious emotions, empathy, and forgiveness all predicted adolescent prosocial behavior but in different ways across gender and grade. It implies that adolescents need diverse educational programs according to their gender and grade, to promote their self-conscious emotions, moral emotions, and prosocial behavior.

• Research in Community and Public Health Nursing
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• v.12 no.1
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• pp.71-80
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• 2001

In an attempt to measure the needs of sexuality education according to sex. grade. type of school. this study was carried out. For this study, the questionnaires were given to 600 students of 4 high-schools in Seoul from March to April. 1999. Students never being received sexuality education were 32.5%. Even though in students being received sex education, the answer of being very instructive was only 2.2%. The needs of sexuality education in boy-student was high in sexual behavior and relationship domain as compared with the girl-student, especially high in masturbation and sexual dysfunction. In girl-student, the needs of sexuality education were high in abortion. sexual damage. In third-grade, the needs of sexuality education were high in personal skill domain as compared with the first and second-grade. And the second-grade's needs were high in sexual behavior domain. In academic school students, the needs of sexuality education were high in sexual behavior and sexual health domain as compared with vocational school. In conclusion, a variety of systematic sex education programs suitable for each characteristic of adolescence should be in need of being developed to the base on the sex educational needs of the students.

• Journal of dental hygiene science
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• v.9 no.4
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• pp.381-385
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• 2009

This study carried out to provide basic educational material of primary school children to improve the children's oral health by oral health checkup and survey over 215 students in the first grade and the fourth grade at the primary school in Hwaseong city. The collected data were analyzed by SPSS Win 12.0 program 1. The rate of students who have decayed permanent teeth was 57.2%, and there seemed to be a significant difference between the two genders showing 61.6% for male students and 53.3% for female students. Also 1st grade showed 56.0% and 4th grade 58.1% respectively. 2. The male students who claimed 'bleeding gum' against questions about oral illness experiences were 15.7% whereas female students were 28.0%. There was a significant difference(p<0.05) by the gender. 3. The 4th grade students who said 'Toothache while eating cold food' about questions of oral symptoms appeared as 19.4% and 1st grade students were 8.8%. Also there was a significant difference(p<0.05) by the grade. 4. Regarding oral health improvement behavior, there were significant differences in frequency of toothbrushing a day, the number(p<0.05) of eating snacks a day and the number(p<0.01) of experience of visiting dental clinic(p<0.01). 5. About oral health behavior frequency of daily toothbrushing was found as twice(50.2%), twice of eating snacks a day(70.2%), using fluoride toothpaste 60.9% and visiting a dental clinic(60.0%), were shown as the highest numbers.

• Journal of the Korean School Mathematics Society
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• v.26 no.2
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• pp.87-110
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• 2023

This study aimed to proposed repeated reading aloud, which combines repetitive reading and reading aloud, as a method for teaching and learning mathematics. We investigated the effect of repeated reading aloud on students' academic achievement and cognitive load, and explored the implications of repeated reading aloud as a method for teaching and learning mathematics. To this end, we conducted a case study involving repeated reading aloud for two units: the limit of a function and the number of cases. The study targeted four 9th-grade students and four 10th-grade students, analyzing how their academic achievement and cognitive load changed. As a result, the eight students showed positive changes in academic achievement and cognitive load as the repeated reading aloud accumulated. When comparing the units, the academic achievement was lower for the limit of function than the number of cases. In terms of cognitive load, students exhibited higher cognitive load in the unit on the limit of function. When compared cognitive load by grade, there was no significant difference after 3rd repeated reading. However, in both units, the academic achievement of four 10th-grade students was higher than that of four 9th-grade students. Nonetheless, the gap narrowed as the reading aloud was repeated.

• Journal of Hydrogen and New Energy
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• v.34 no.1
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• pp.83-89
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• 2023

In this study, a computer simulation work has been performed for the separation of electronic grade highly pure carbon dioxide more than 7 N purity through a cryogenic distillation process. For the cold utility as a cooling medium for a condenser of the cryogenic distillation column, propylene was utilized as a refrigerant in the vapor-recompression refrigeration cycle. Through this work, it was concluded that the cryogenic distillation column with two stage compression and refrigeration cycle were essential to obtain a highly-pure liquefied CO₂.

• Journal of The Korean Association For Science Education
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• v.31 no.8
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• pp.1175-1185
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• 2011

Language skills in science education seem to have a great impact on student achievement. Most of the language skills affecting students' science learning can be accounted for an understanding of scientific terms. The ultimate goal of this study is selecting and grading the scientific terms for science education. As a basic research, we investigated scientific terms contained in science textbooks, because they are the most basic and selected terminologies. As a result of investigation of scientific terms in physics units of middle school science textbooks, we made a list of 556 scientific terms by grade level. This includes 249 words for grade 7, 170 words for grade 8, and 137 words for grade 9.

• Journal of Gifted/Talented Education
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• v.3_4 no.1
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• pp.158-166
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• 1994

The nature of the classroom environment is an important variable to understand when fostering creativity for elementary children. Studies of the classroom climate, structure or interaction commonly depend on behavioral observations or reports from the teacher or other adult-observer. Recent studies have used self-report instruments completed by students regarding their perceptions of various aspects of their class (see Fraser, 1991). The purpose of this study was to determine the developmental differences in the ratings of classroom environment between Korean students who are gifted and their American peers. The My Class Inventory was administered to 141 elementary students in grades three, four, and five. There were 65 Korean students and 76 American students who were identified as gifted by their schools. Reliability coefficients were calculated for all scales (satisfaction = .68: friction, .67; competition = .57; cohesion = .73; difficulty = .22). Results of a multivariate analysis illustrated significant differences between students from Korea and students from America on the MCI. Univariate analysis of variance of cultural group by grade level were conducted for four of the five scales. Significant differences were found by country for the cohesion scale and by country at grade levels for the satisfaction scale. American children expressed greater satisfaction than their Korean counterparts at all grade level, but particularly at grade five. Implications for further research are discussed.

• The Mathematical Education
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• v.50 no.3
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• pp.367-381
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• 2011

It is important to concern about individual difference on every subject and every class. How can we know the individual difference? It is helpful for that to find out students' math learning style and learning type. In this paper, I conducted a survey to look for math learning style and math learning type of 4th, 5th and 6th grade students, and analyzed those data. The research findings are summarized as follows; First, 4th, 5th and 6th grade students prefer the visual learning style to the verbal style, and they have more wholistic tendency than analytical tendency in the domain of the cognitive learning style. Second, they prefer the authoritative and goal-oriented learning style to the practical and recreational learning style, and they have more interior-oriented than exterior-oriented in the domain of affective learning style. Third, the representative math learning type of 4th, 5th and 6th grade students is visual/holistic/authoritative and goal-oriented/interior-oriented. The math learning styles of students have a lot of influence on their learning, so that an appropriate teaching method for each student could arouse a maximum effect in the math study.

• Asian Pacific Journal of Cancer Prevention
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• v.15 no.22
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• pp.9841-9846
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• 2014

Objectives: To compare the metabolic indices, lipid profile, androgens, and prostate specific antigen between prostate cancer and BPH and between grades of prostate cancer in a cross-sectional study. Materials and Methods: The study enrolled 95 cases of prostate cancer and 95 cases of benign prostatic hyperplasia (BPH). Prostate gland volume was measured using transrectal ultrasound. We compared insulin, testosterone, dihydrotestosterone, prostate specific antigen levels and lipid profile between prostate cancer of different grades and BPH. Further, prostate cancer patients were classified into low grade and high grade. Unpaired t-test for normally distributed variables and Man-Whitney U test for non-normal variables were used to assess differences. Results: We found that prostate cancer patients had significantly higher levels of insulin, testosterone, PSA, cholesterol, triglycerides, low-density lipoprotein (LDL) and very low-density lipoprotein (VLDL) in comparison to their BPH counterparts. Higher levels of these parameters also correlated with a higher grade of the disease. Conclusions: We conclude that higher levels of insulin, testosterone, PSA, and cholesterol correlate with a higher risk of prostate cancer, and also with a higher grade of the disease.