• Journal of Digital Convergence
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• v.18 no.9
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• pp.423-431
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• 2020

The purpose of this study is to examine how the level of participation in dance classes affects the development of social skills and peer relationship. The results are as follows: First, in terms of social skill development and peer relationship based on demographic characteristics, competition-a sub-factor of peer relationship-was higher in male students. In terms of grade level, confidence-a sub-factor of peer relationship-was high in second year students. Second, in terms of the effect of dance class participation on social skill development, autonomy, achievement, and cooperation-sub-factors of social skill-were significantly influenced by the period of participation in dance classes. Participation frequency, on the other hand, was found to significantly impact accountability and activity. Such results indicate that longer dance class participation periods more significantly influences social skill development. Third, in terms of the influence of dance class participation in peer relationship, students who participated in dance classes longer experienced positive impacts regarding sub-factors of peer relationship. Longer participation periods were correlated with lower hostilities. That is, longer participation period and time, as well as, higher participation frequency, have impact on peer relationship.

• Clean Technology
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• v.25 no.3
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• pp.189-197
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• 2019

In this study an optimization of the preparation conditions of activated carbon with a ternary metal ion material to treat $H_2S$, which is classified as a representative odor substance, was carried out. For a metal ion material for enhancing the adsorption performance of hydrogen sulfide, performance enhancement was confirmed by combining Li and Fe or a ternary combination (K, Li, Fe) based on KI, which is a substance promoting hydrogen sulfide adsorption performance. Also, it was determined by XRD analysis that the reaction of each active substance with $H_2S$ was because of binding. The adsorption performance increased more than 3 times with heat treatment of the adsorbent with nitrogen compared with heat treatment with air. The maximum adsorption constant ($q_m$) value of the optimum adsorbent was 97.07, which is 6 times higher than that of the existing K-based impregnated activated carbon. It was confirmed that the objective adsorption amount ($0.3g\;g^{-1}$) was secured by an equilibrium between the mass transfer rate and adsorption rate. From the results, it was confirmed that the performance improvement was noticeable even when activated carbon with a reagent grade activated carbon particle size was modified. It was confirmed that the adsorption performance exists at high relative humidity levels of 60 and 100%, and the optimized preparation can be applied to a wet process such as a scrubber downstream.

• Journal of the Korea Society of Computer and Information
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• v.26 no.7
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• pp.65-73
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• 2021

The purpose of this study is to cornpare the differences in clinical competence, knowledge of patient safety management and confidence of patient safety management according to the clinical practice experience of nursing students, Of the 73 nursing students who experienced clinical practice and 35 nursing students who did not experience, a total of 108 students in the third grade were analyzed, In the results of this study, clinical competence(t=.88, p=.377) knowledge of patient safety management(t=-.29, p=.773), and confidence of patient safety management(t=1.11, p=.267) the difference between was not statistically significant in the two groups. In the two groups, the score of the sub-area according to each variable is the lowest. First, the sub-area of the nursing process a lowest score in clinical competence, and the second, the sub-area of measuring knowledge about concept of near miss was the Knowledge of patient safety management. The score was the lowest in, and thirdly, the sub-area of writing an incident report when an error occurred had the lowest score in confidence of patient safety management. Therefore, in order to improve the quality of clinical competence of nursing students, it is necessary to develop a strategic educational guideline to improve the clinical practice education environment, to improve patient safety management capabilities and to cultivate correct attitudes toward patient safety management.

• Korean Chemical Engineering Research
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• v.62 no.4
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• pp.335-343
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• 2024

This study was conducted to confirm the potential of adhesive resins formulated with rapeseed flour (RSF), which is a residue in the production of edible oil, for the manufacture of medium-density fiberboards (MDF). The RSF-based adhesive resins were formulated with the weight ratio of RSF hydrolyzates (80, 70, 60 wt%) to PF prepolymer(20, 30, 40 wt%), MDF was fabricated in accordance with its resin content and target density using the RSF-based adhesive resin, and then the physical properties(density, moisture content, bending strength, internal bonding strength and thickness swelling) and formaldehyde emission of the MDF were measured. The effect of the weight ratio of RSF hydrolyzate to PF prepolymer was the greatest, followed by that of target density and resin content. The values of MDF fabricated with RSF-based adhesive resins exceeded those with urea-formaldehyde resins, which is mostly used as a resin in the manufacture of MDF. Based on the results of MDF per experimental factors, the optimal conditions were determined to target density of 0.7 g/cm³, resin content of 5% and PF-prepolymer weight ratio of 40 wt% in RSF-based adhesive resin, and physical properties and formaldehyde emission of the MDF fabricated with the conditions satisfied the requirements for MDF and E₀ grade, which was designated by National Institute of Forest Science, except for thickness swelling. In conclusion, the potential of RSF-based adhesive for the production of MDF could identify on the basis of the results of this study. However, the stable securement of RSF through the development of bio-refinery process for rape plant is required to commercialize RSF-based adhesive resins for MDF production.

• Analytical Science and Technology
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• v.24 no.6
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• pp.477-483
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• 2011

This work is on the synthesis of EMI-$BF_4$ (1-ethyl-3-methylimidazolium tetrafluoroborate) and purification of spectroscopic grade using aluminium oxide method, activated charcoal method, and liquid/liquid fractional extraction method in order to make supercapacitor finally. But the aluminum oxide method and the activated charcoal method were not suitable for obtaining high-purity ionic liquids. The liquid/liquid fractional distillation method turned out that as the concentration of solvent ($H_2O$) was increased, the higher purity of EMI-$BF_4$ was obtained and the electrical capacity of this compound was increased to higher value. When the solvent was changed to from methylene chloride to 1,2-dichloroethane, the higher purity of EMI-$BF_4$ was obtained.

• Tunnel and Underground Space
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• v.10 no.1
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• pp.80-91
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• 2000

Open cut mining of limestone is generally considered to be more advantageous than underground mining in recovery, grade control, economics, and safety, but it causes substantial environmental pollutants such as ground vibration, noise, dust. It also changes ground surface and may destroy vegetation. The Halla limestone mine which lies adjacent to Baikdu mountains range is selected for a model study. To reduce environmental hazards, and to conserve original surface and woods, both open cut and underground mining methods must be adopted. In case of sub-level sloping. a unit block of 87m high, 70m wide, and 100∼l20m long is suggested with an estimated overall recovery of 42%. Some suggestions to reduce the environmental hazards are also included. The followings must be considered in determining the degree of fragmentation; the discontinuity conditions in the rock mass and the charge concentration both at the bottom and column of the hole. In addition to adopting a barrier wall for reducing environmental hazards, the probable production from underground mining is also discussed.

• Journal of Science Education
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• v.41 no.3
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• pp.499-518
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• 2017

In this study, the meta-analysis technique was applied to investigate the effectiveness of gifted-mathematics programs on development of creativity. Studies conducted the outcomes form the 20 studies were used for meta-analysis. Research questions are as follows; first, what is the overall effect size of the gifted mathematics programs on development of mathematical creativity. Second, what are effect sizes of sub-group(fluency, flexibility, originality) analysis. Third, compare the effect sizes of those in compliance with the grade and the class type. Results from data analysis are as follows. First, the overall effect size for studies related the gifted-mathematical programs was .66, which is high. Second, it was found that each sub-group differed from its effect on learning outcomes. Fluency(.76) was the highest of all, which was followed by flexibility(.60) and originality(.50) in a row. Lastly, the overall effect size for gifted elementary school students related the gifted-mathematical programs was .69, which is high than gifted middle school students was .46.

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.11 s.158
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• pp.1538-1549
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• 2006

The purpose of this study was 1) to identify gender differences in appearance management behavior and influencing variables(media involvement, body satisfaction and self-esteem), 2) the effects of influencing variables on appearance management behavior, and 3) to analyze the relationships among influencing variables. The data were collected ken 458 fifth and sixth grade girls and boys of five elementary schools ill Seoul, Korea via self-administered questionnaires, and were analyzed by factor analysis, t-test, and multiple regression analysis. The results of this study were as follows: Regarding the gender differences in research variables, preteen girls showed more interest in clothing/hair style management, weight management, TV involvement and celebrity imitation than preteen boys. Girls showed lower level of satisfaction than boys. Multiple regression analyses were conducted to identify the effects of media involvement, body satisfaction and self-esteem on appearance management behavior. For boy group, clothing/hair style interest was influenced by celebrity imitation, and weight management by TV involvement, body satisfaction and school self-esteem, and height management by celebrity management and school self-esteem. For girl group, clothing/hair style management was influenced by celebrity imitation and general self-esteem, and weight management by body satisfaction, general self-esteem, celebrity imitation and TV involvement, and height management by school self-esteem, TV involvement, time spent watching TV and general self-esteem. From the results of analyzing relationships among influencing variables, it was found that media involvement influenced self-esteem; TV involvement and celebrity imitation influenced school self-esteem; body satisfaction had the effect on all three sub dimensions of self-esteem in boy group. For female group, TV involvement had the effect on body satisfaction, and celebrity imitation on general self-esteem, the family self-esteem and school self-esteem, and body satisfaction on all three sub dimensions of self-esteem.

• Journal of dental hygiene science
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• v.17 no.5
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• pp.439-446
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• 2017

The purpose of this study was to investigate the effect of empathic ability and campus life stress on the stress coping behaviors among 395 dental hygiene students. The analysis was performed using PASW Statistics ver. 18.0, and the following conclusions were obtained. The empathic concern factor was the highest in the subscale of empathic ability (3.60). The interpersonal relationship stress was 1.65 and the task-related stress was 2.72. The stress coping behaviors were the highest among the sub-domains, with 3.69 for wishful thinking. The differences of stress coping behaviors according to general characteristics were as follows. The lower the age and grade, the higher the problem-focused coping; when they were religious there was a high pursuit of seeking social support. When they were satisfied with their economic level, wishful thinking was high. There was a low negative correlation between empathic concern and interpersonal relationship stress in campus life (p<0.01). There was a positive correlation between personal distress and task-related stress (p<0.001). The relationship between empathic ability and stress coping behaviors was most associated with personal distress and wishful thinking. Among the sub-domains of stress coping behaviors, factors that have a common impact on personal distress and seeking social support are viewpoint acceptance. Factors supporting emotional focus and wishful thinking were task-related stress. Dental hygiene students are not able to completely eliminate the stress that they are actually under. However, as the research results show, it is necessary to use stress coping techniques to cope effectively with individual tendencies and situations, and to improve the ability to sympathize with another individual.

• Journal of Environmental Health Sciences
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• v.38 no.1
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• pp.42-50
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• 2012

The purpose of this study was to investigate the concentration and distribution characteristics of $PM_{10}$ at high schools classrooms in Ulsan and its surroundings. This study evaluated $PM_{10}$ levels in classrooms at 79 high schools in Ulsan from May 2008 to May 2009. The average $PM_{10}$ level was 63.8 ${\mu}g/m^3$, and the rate of exceeding the statutory maintenance limit was 16.0%. The average $PM_{10}$ level was higher in general schools (64.9 ${\mu}g/m^3$) compared to professional schools (59.2 ${\mu}g/m^3$), and private schools (66.6 ${\mu}g/m^3$) was higher than that of public schools (62.5 ${\mu}g/m^3$). The average $PM_{10}$ level (68.4 ${\mu}g/m^3$) in general classrooms was significantly (p < 0.01) higher than that in multi-purpose ones (54.6 ${\mu}g/m^3$), and first-year student classrooms (73.3 ${\mu}g/m^3$) was significantly (p < 0.05) higher than that in second or third grade ones (67.6 ${\mu}g/m^3$, 51.5 ${\mu}g/m^3$, respectively). The $PM_{10}$ level in schools in Dong-Gu in the vicinity of assorted industrial complexes was higher than that of schools located in other districts around the Ulsan Metropolitan Area. The regression model showed that $PM_{10}$ level was positively associated with number of students and relative humidity.