• Journal of Power System Engineering
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• v.18 no.1
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• pp.106-111
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• 2014

This article describes effect of post heat treatment on wear characteristics of thermally sprayed Co-based self-flux alloy coating. Co-based self-flux alloy coatings were deposited on steel substrates using a flame spray process. Post heat treatments were carried out at 800, 900, 1000 and $1100^{\circ}C$ for 30min in a vacuum chamber. For analysis of effect of post heat treatment on mechanical properties, wear test and hardness test were performed for post heat-treated coating specimen. Microstructures of heat treated coating layer and wear track were examined using SEM and EDS. Wear loss and hardness became lower with increasing post heat treatment temperature.

• Korean Journal of Child Studies
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• v.35 no.2
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• pp.63-84
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• 2014

The purpose of this study was to explore the effects of parental differential treatment and social support perceived by adolescents with siblings with special needs on their self-esteem and internalized problems. The subjects comprised one hundred 12- to 18-year-old adolescents with siblings with special needs. The major results of this study were as follows. First, there were significant differences in adolescents' self-esteem by participation in support programs for siblings of children with special needs. Second, there was no significant effect of parental differential treatment on adolescents' self-esteem. Third, there was a significant effect of social support (family, friends, and teachers) on adolescents' self-esteem. Fourth, there was no effects of paternal differential parenting on adolescents' internalized problems. However, there was a significant effect of differential maternal affection on adolescents' internalized problems. Fifth, there was a significant effect of social support, especially in terms of support provided by friends, on adolescents' internalized problems. In conclusion, social support and differential maternal affection both have an important role in adolescents' self-esteem and internalized problems.

• The Journal of Korean Medicine
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• v.43 no.1
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• pp.87-98
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• 2022

Objectives: The purpose of this study was to investigate the effect of weight loss in Korean Medicine (KM) obesity treatment combined with self-monitoring and to identify the relevant factors which are related to successful weight loss. In addition to this, adverse events reported by the patients were analyzed to assess the safety of KM treatments for obesity Methods: This was a retrospective observational study that analyzed the medical records of the patients that participated in the 10-week of KM treatment. All patients took herbal medicine for weight loss and were instructed to reduce calorie intake and adhere to self-monitoring. Clinical data including body weight were collected for evaluating the effect of the treatments. Behavior factors affecting weight loss were collected. The correlation between each factor and weight loss was analyzed. Adverse events (AEs) were collected at each time to evaluate the safety of the intervention. Results: One hundred eighteen patients' records were included in this study. The average weight loss was 7.64kg(74.59kg to 66.95kg). 94.9% of patients lost 5% or more of their initial weight. The degree of weight loss was identified to be related to self-assessment of diet control and self-assessment of appetite control. The average self-weighing frequency significantly increased(2.45 times/week before treatment and 4.70 times/weeks during treatment). Constipation, insomnia, and dizziness were found to be the most frequent AEs, and except for one case, most AEs were mild cases. Conclusion: From this study, we found that KM obesity treatment combined with self-monitoring showed significant weight loss without serious AE.

• Journal of Korean society of Dental Hygiene
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• v.17 no.2
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• pp.203-213
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• 2017

Objectives: A study investigated the effect that a dental orthodontics treatment has on the social life and self-worth perceived by the patient. The study was conducted to collect information on patients worried about dental orthodontics in later life. Methods: A survey was conducted on patients with dental orthodontics living in Seoul and Gyeonggi-do, from December, 2016. Of the collected 200 aquatic samples, 182 were used for the analysis, corresponding to 91% of the collected data, while excluding 18 insufficient responses. Results: The difference in self-worth and perceived social life before and after dental orthodontic treatment were investigated. Self-worth increased by 0.53 points after dental orthodontics treatment. Perceived social life increased by 0.81 points after dental orthodontics treatment. Conclusions: The relationship between self-worth and perceived social life after dental orthodontics treatment was found to be closely correlated. The study provides information on people hoping for treatment in accordance with the insurance benefits that should be offered.

• The Korean Journal of Elementary Counseling
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• v.4 no.1
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• pp.85-98
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• 2005

This study aimed at examining an effect of a group art treatment program on isolated children's self-concept and adaptation to the school life in an elementary school. To achieve this goal, the two hypotheses were made. Hypothesis 1. Children in the experimental group that participated in the group art treatment program will show more improvement in self-concept than those in the control group. Hypothesis 2. Children in the experimental group that participated in the group art treatment program will show more improvement in the ability to adapt themselves to the school life than those in the control group. To test the hypotheses, the socio-emotional isolation test developed by Heo Seung-hi (1993) was carried out with 120 third-graders at K elementary school in Busan; then, 24 isolated children (12 boys and 12 girls) at the upper 25 percent level were randomly sampled and assigned to each of experimental and control groups. The five-stage art treatment program as a reconstruction of the prior study to meet the goal of this study was provided to children in the experimental group at the researcher's classroom after school for 13 sessions, two sessions per week. The self-concept test manufactured by Song In-seop (1996), the school life adaptation test developed by Lee Yeong-seon (1997), and the experimental group's school life drawing (KSD) were used to test an effect of the program. For data analysis, two methods, a quantitative analysis of two tests and a qualitative analysis of KSD, were used. The findings were as follows: After implementing the art treatment program with the experimental group, there was significant improvement in all areas. This study concluded that if a group art treatment program is applied to elementary school practice, it will help isolated children improve their self-concept and ability to adapt themselves to the school life.

• Research in Mathematical Education
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• v.13 no.2
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• pp.109-122
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• 2009

This study investigates the change in two theoretical constructs, attitudes toward mathematics and mathematics self-efficacy, among college students involved in a learning community model. The case of this study was a developmental mathematics class offered at a historically black college located in the southeastern United States. Subjects included 31 students enrolled in an introductory mathematics course, some of whom participated in a learning community (treatment group). The participants completed mathematics attitudes and mathematics efficacy instruments twice: at the beginning of the semester and again at the end. Data was analyzed using descriptive statistics and a non-parametric statistic. The results showed that students' attitudes toward mathematics and mathematics self-efficacy are strongly correlated; the mathematical problem-solving efficacy changed significantly over time and it is significantly higher in the treatment group than in the control group; and the treatment group produced better outcomes. These findings indicate that a learning community model can increase students' mathematics self-efficacy beliefs. It is recommended that mathematics self-efficacy and attitudes toward mathematics be measured over an extended period of time when a learning community is implemented.

• Journal of Fisheries and Marine Sciences Education
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• v.13 no.2
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• pp.194-211
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• 2001

This study was conducted to investigate the effects of cooperative learning applying Jigsaw II on learner's self-regulated learning ability, achievements, self-esteem & cooperation. 12 graders were assigned to experimental group(applying Jigsaw II treatment) & control group(applying traditional instructional treatment). Experimental group was trained to ask comprehension & thought-provoking questions on the material when in tutor role & to explain material to group members when acting as tutee. Tutorial sessions followed over 8-week treatment. As a results, Experimental group outperformed control group on ability to construct learner's self-regulated learning ability, achievements, self-esteem & cooperation both during their tutorial interaction & on written measures.

• Journal of the Korean Society of School Health
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• v.20 no.1
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• pp.37-44
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• 2007

Purpose: The purpose of this study was to explore the effect of aromatherapy on speech anxiety and self-esteem of elementary students. Methods: Sixty-eight elementary students were studied for one week during which they underwent lavender fragrance treatment using vaporizer. All subjects were in 4th grade of elementary school in Seoul. Before and after treatment, the severity of speech anxiety and self-esteem was evaluated by questionnaire. Results: After treatment, the score of speech anxiety had decreased significantly from 20.1 to 18.5 (p=0.000) and the score of self-esteem had increased significantly from 28.9 to 30.3(p=0.020). Conclusion: According to the study results, it can be concluded that aromatherapy showed effect on speech anxiety and self-esteem of elementary students.

• Journal of Korean Society of Water and Wastewater
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• v.24 no.6
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• pp.683-690
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• 2010

Renewable and unutilized energy (biogas power generation, wind power, solar, small hydro-power, sewage heat source, etc.) seems to be suitable to install for the sewage treatment facilities. There are 357 sewage treatment plants in 2007. 17 plants among these have been operating for self-supporting energy by using solar power, small hydro-power and biogas in 2008. Newly built sewage treatment plant of 96,000 $m^3$/day for a newtown is expected to get up to energy consumption of 10 GWh/yr. If solar energy, small hydro-power and biogas-equipments were applied to the new treatment plant, self-supporting energy of the new sewage treatment plant will get up to 56.1%. As a results, about 2,379ton $CO_2$/yr $CO_2$ emission reduction can be expected by using renewable energy. These efforts for self-supporting energy will lead sewage treatment plant to new energy recycle center.

• Journal of Power System Engineering
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• v.11 no.1
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• pp.121-126
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• 2007

This study aims at investigating the effect of heat treatment conditions on the dry sliding wear behavior of thermally sprayed Ni-based self-flux alloy coatings. Ni-based self-flux alloy powders were sprayed onto a carbon steel substrate and then heat-treated at 700, 800, 900 and $1000^{\circ}C$ for 30 minutes in a vacuum furnace. Dry sliding wear tests were performed using sliding speed of 0.4 m/s and applied load of 6 N. AISI 52100 ball(diameter 8 mm) was used as counterparts. Microstructure and wear behavior of both as-sprayed and heat-treated Ni-based self-flux alloy coatings were studied using a scanning electron microscope(SEM), energy dispersive X-ray spectroscopy(EDX), electron probe micro-analysis(EPMA) and X-ray diffraction(XRD). It was revealed that microstructure and wear behavior of thermally sprayed Ni-based self-flux alloy coatings were much influenced by heat treatment conditions.