• Progress in Superconductivity
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• 제1권1호
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• pp.68-72
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• 1999

Since the discovery of high Tc superconductors, great efforts have been focused to develop high performance HTS magnets for the ultimate applications to power system devices. Magnet designers, however, have had difficulties in the estimation of the maximum operating current of the designed magnet from the tested short sample data, due to the degradation of the critical current density in the magnet. Similar story applies to the HTS electrical bus bar. It has been found that the critical current of Bi-2223 stacked tapes is much less than the total summation of critical currents of each tape, which is mainly attributed to the self magnetic fields. Furthermore, since the critical current degradation of Bi-2223 tape is greater in the normal magnetic field (to the tape surface) than in the parallel one, detailed magnetic field configurations are required to reduce the self field effects. In this paper, we calculate the self field effects of a stacked conductor, defining self field factors of normal and parallel magnetic fields to the tape surface. Finally, the critical current degradations in the HTS magnet are explained by the introduced self field factors of the stacked conductor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.302-304
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• 1998

Self magnetic field in a Bus bar usually degrades the critical current in it. Actually the total critical current of a Bus bar is not the same as the sum of total critical current of each stacked HTS tape. This is due to the self field effects in a bus bar. To reduce the degradations of critical current in a bus bar, we need to analyze the self field distributions in a bus bar. Conceptually, by rearranging the each stacked tapes, the self field effects can be minimized. In this paper, we calculate the self magnetic field distributions across a bus bar analytically, with the variations of the relative angle of the two conductors in a go-and-return pair. As a result, we suggest that the optimum relative angle exist which minimize the self field effect in a bus bar.

• 대한치과기공학회지
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• 제44권3호
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• pp.81-88
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• 2022

Purpose: This study was conducted to verify the effects of self-esteem and critical thinking disposition on dental laboratory technology students' field practice stress. Methods: The subjects of the study were 198 dental laboratory technology students with clinical practice experience located in Gyeongsangbuk-do and Gyeongsangnam-do. The collected data were analyzed by t-test, ANOVA, correlation analysis, and linear regression analysis using IBM SPSS Statistics ver. 22.0 (IBM). Results: The average self-esteem, critical thinking disposition, and field practice stress scores were 3.76, 3.50, and 2.40, respectively. There was a significant correlation between self-esteem, critical thinking disposition, and field practice stress. It was found that the higher the self-esteem, the lower was the field practice stress. On the contrary, among the sub-items of critical thinking disposition, when intellectual fairness increased, the field practice stress decreased; however, when healthy skepticism increased, the field practice stress increased. Conclusion: Self-esteem and critical thinking disposition were both found to have a substantial effect on field practice stress. Therefore, various educational programs need to increase self-esteem and cultivate critical thinking skills for a successful field practice and field practice stress relief of laboratory technology students.

• Transactions on Electrical and Electronic Materials
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• 제1권1호
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• pp.12-16
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• 2000

In this paper, we analyze self field effects of Bi-2223 tape-stacked cable assuming constant current density in the cross section of stacked cable. Generally, the critical current of Bi-2223 tape-stacked-cable in much less than the total summation of critical currents of each tape, which is mainly due to the self magnetic fields of the cable itself. Therefore, to predict the critical current of Bi-2223 tape-stacked-cable, we needs to analyze the self filed effects on the stacked cable as well as critical current density data(J$\_$C/) of one tape. To make it more complex, the critical current degradation of Bi-2223 tape is an-isotropic; the critical current is lower in the normal magnetic field(to the tape surface) than in the parallel field. In the paper, a novel approach to predict the critical current of a Bi-2223 tape-stacked-cable from a J$\_$C/-B curve of one tape is presented with the assumption of constant current density across the stacked cable, The approach basically includes the load analysis of the stacked tapes, and its usefulness is confirmed by the experimental data.

• Journal of the Optical Society of Korea
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• 제1권1호
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• pp.23-25
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• 1997

In this paper we will show theoretically that a refractive index grating exhibits a retro-self-focusing effect and an accompanying pinholing effect under the Gaussian intensity distribution of an incident optical field. Those effects result from an effective wave number change of the medium due to the intense optical field.

• 디지털융복합연구
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• 제15권6호
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• pp.273-282
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• 2017

본 연구는 보건의료분야 대학생들의 메타인지와 학습몰입의 관계에서 자기효능감의 매개효과를 규명하기 위하여 시행되었다. 연구대상은 간호학과와 보건행정학과에 재학 중인 300명의 학생이었으며, 2016년 11월 23일부터 12월 2일까지 자기기입식 설문지를 통하여 자료를 수집하였다. 수집된 자료는 SPSS/WIN 23.0 프로그램을 이용하여 평균과 표준편차, t-test, ANOVA, Pearson correlation coefficients, hierarchical regression analysis로 분석하였다. 연구결과 메타인지는 학습몰입에 긍정적인 영향을 주는 것으로 나타났으며(${\beta}=.678$, p<.001), 메타인지와 학습몰입의 관계에서 자기효능감이 부분 매개하는 것으로 나타났다. 이러한 결과는 보건의료분야 대학생의 학습몰입에 메타인지가 매우 중요하며, 이 관계에서 자기효능감이 영향을 미친다는 것을 의미한다. 본 연구에서 보건의료분야 대학생의 메타인지가 자기효능감을 매개로 하여 학습몰입에 미치는 영향이 달라진다는 것을 확인하였으므로, 대학에서는 수업 시 메타인지를 높일 수 있는 다양한 교수학습 전략을 개발하여 적용할 필요가 있다.

• 한국산학기술학회논문지
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• 제12권3호
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• pp.1128-1135
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• 2011

본 연구는 육상 투척 선수들의 자기관리와 심리적 행복감의 관계를 실증적으로 규명하기 위한 것으로 연구의 대상자는 대한육상경기연맹에 등록된 고등부, 대학, 일반실업 육상투척선수로서 제91회 전국체전 대회에 출전한 고등부, 대학, 일반실업 선수(남:82, 여:102)로서 총 184명을 대상으로 조사하였다. 수집된 자료를 분석하기 위해 변량분석(ANOVA)과 중다회귀분석(multiple regression)을 실시한 결과 다음과 같은 결론을 얻었다. 첫째, 투척선수들의 사회인구학적 특성에 따른 자기관리 및 심리적 행복감에는 차이가 없는 것으로 나타났다. 둘째, 투척종목 선수들의 자기관리와 심리적 행복감에는 유의한 인과관계가 있는 것으로 나타났다. 즉, 자기관리는 심리적 행복감에 유의미한 영향을 미치는 것으로 나타났다. 이상의 결과을 종합해 볼 때, 이 연구에서는 육상경기 중 투척경기의 선수들의 사회 인구학적 특성에 따른 자기관리와 심리적 행복감에는 차이가 없고, 자기관리는 심리적 행복감에 긍정적인 영향을 미치는 것으로 나타났다. 따라서 선수들의 심리적 행복감을 통한 최적의 경기수행을 이끌어 내기 위해 철저한 자기관리를 위한 프로그램을 제공해야 한다는 종합적인 결론을 제시할 수 있다.

• 복식문화연구
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• 제26권4호
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• pp.519-530
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• 2018

Nail-care services are growing rapidly. If causes for the increase in nail-care service consumption is diversion or self-satisfaction, we can speculate that consumers perform self-care through nail-care services. Nail-care-service consumption should be allowed to increase because of the positive psychological effects such as improving mood or alleviating depressed emotions. Moreover, the psychological effects of nail-care services differ according to consumers' tendencies. Therefore, this study divides the types of consumers, to investigate whether there is a difference in the psychological effects of nail-care services depending on the types. This study used the questionnaire survey method. Results of the study revealed that the sub-factors of self-esteem, extracted as two factors, were "personal self-esteem" and "social self-esteem". Consumers were classified according to the sub-factors of self-esteem into four groups. There were differences in the psychological effects of nail-care services according to these four groups. It was found that all groups had psychological effects above the average value. This result indicates that only the degrees of psychological effects differ in accordance with the types of self-esteem, and that psychological effects generally play a large role in all types. Since psychological effects were positive for everyone regardless of their self-esteem, utilizing nail-care services considerably reduces the depression and anxiety of modern people. Nail-care services expected to become the basis of the nail therapy field.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.245-254
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• 2022

This study is a study to empirically verify the mediating effect on college life adaptation and career preparation behavior of college students. The purpose of this study is to empirically analyze the multi-mediated effects of major satisfaction, job stress, and self-directed learning. For this study, 216 university students were enrolled. For the collected data, SPSS Process macro was used. The result is as follows. First, there were multiple parallel mediating effects and multiple serial mediating effects on major satisfaction, job stress, and self-directed learning between college life adaptability and career preparation behavior. Second, the path of simple mediation and double mediation effect was found between college life adaptation and career preparation behavior. Based on the research, the necessity of revitalizing the program for revitalization of teaching activities and industry-academic cooperation activities in the major field and improvement of career preparation behavior and university life adaptation ability and follow-up research were suggested.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.191-202
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• 2024

Self-efficacy is a major factor related to performance and needs to be improved in business and education field. This study explains the effectiveness of school career assistance to improve college students' self-efficacy. Furthermore, it demonstrates the moderating effects of grit and regulatory focus (promote and prevention). School career assistance is based on group support, and moderating variables in this paper are individual characteristics. In these group and individual dimensions, if the effectiveness of school career assistance varies depending on individual characteristics, schools will be able to establish self-efficacy improvement strategies more appropriate for individual students. School would understand individual characteristics such as grit and regulatory focus, then could make individual strategy for enhancing self-efficacy and performance. Hence, it is expected that the performance of school and student will improve through the self-efficacy improvement plan presented in this study.