• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2002.04a
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• pp.333-338
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• 2002

자기베어링의 회전정밀도에 영향을 미치는 인자로 PWM 전력증폭기, 위치 센서 등과 같은 자기베어링 구성 장치의 동특성 및 정밀도, 시스템의 정확한 모델링, 제어기법, 런아웃 등이 있다. 본 연구에서는 능동 자기베어링을 제어하기 위해 자기베어링의 PWM 전력증폭기와 회전축을 모델링하고 이를 바탕으로 능동 자기베어링 제어를 위한 PID 제어기를 구성하였으며, 변위 센서의 부착위치 및 회전축의 진원도의 영향으로 발생하는 주기적인 런아웃 요소를 첨가하여 런아웃의 영향을 확인하였으며, 런아웃 (Runout)에 의해 발생하는 에러(Error)를 효과적으로 제어하여 자기베어링의 제어 정밀도를 향상시키기 위한 방법으로 기본적인 PID 제어기에 최소평균자승(Least Mean Square, LMS) 알고리즘을 적용한 적응 피드포워드 제어기를 구성하여 자기베어링의 능동 제어에서 발생하는 주기적인 런아웃을 효과적으로 제어할 수 있음을 MATLAB을 통한 시뮬레이션을 통해 확인하였다.

• Journal of the Korea Convergence Society
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• v.11 no.2
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• pp.139-145
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• 2020

The purpose of this study was to investigate the relationship between mindfulness (K-MAAS), Gratitude(Gratitude Questionnaire, GQ-6), and career decision-making self-efficacy (CDSES-SF) as a factor influencing adults career development. Subjects were 89 adults in cyber university and graduate school. SPSS 23.0 and PROCESS Macro were used for data analysis. As a result, there was a significant correlation between gratitude, mindfulness, and career decision-making self-efficacy. Also, the mediating effect was shown between GQ-6, CDSES-SF, and K-MAAS. The direct effect of GQ-6 and CDSES-SF was found to be a positive relationship, and indirect and total effects were also significant. This suggests that mindfulness is mediated in part by the relationship between gratitude and career decision-making self-efficacy. To improve career decision-making self-efficacy, group counseling and education programs are needed to experience gratitude and mindfulness.

• Journal of Digital Convergence
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• v.18 no.7
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• pp.255-263
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• 2020

According to the notion that anxious attachment may not explain depression fully, there has been abundant studies investigating the mediating factors affecting the relationship between anxious attachment and depression. However, there was no previous study examining the mediating effect of self-absorption. Therefore, the present study examined the mediating effect of self-absorption on the relationships between adult anxious attachment and depression for 283 college students. To examine relationships among variables, structural equation modeling analysis was utilized. and the present study found a partial mediation effect of self-absorption in the relationship between anxious attachment and depression. This result suggests that anxious attachment influences attentional process and as a result, the maladoptive self-focused attention can precipitate depression. Current findings can contribute to the field by providing knowledge about risk factors and cognitive mediators affecting mental health of college students who are in "transitional period" in their life. Future studies can investigate interactions among risk, protective, and mediating factors affecting the relationship between anxious attachment and depression among college students.

• The Journal of the Korea Contents Association
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• v.22 no.10
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• pp.816-826
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• 2022

The purpose of this study is to examine the effect of improving academic self-efficacy and self-directed learning ability by conducting a self-directed learning program for college students. To this end, a program was conducted for 28 college students. In order to examine the effectiveness of the program, a single-group pre-post design method was used, which compared the pre-score before the program and the post-score after the program. The program was conducted during the 8 session. The research results are as follows. First, the pre-post scores of the academic self-efficacy of the students who participated in the program increased, but it was not statistically significant. Second, the pre-post score of the self-directed learning ability of students who participated in the self-directed learning program increased significantly. Through these results, the implications of the self-directed learning program for college students and suggestions for follow-up research were presented.

• Korean Journal of Weed Science
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• v.31 no.2
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• pp.192-198
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• 2011

This study was conducted to investigate the herbicidal activity against Scirpus planiculmis (SCPPL) which has been reported as resistant biotype on sulfonylurea (SU) herbicides at the west coast reclaimed area first and proliferated continuously at Hwasung and Pyeongtaek in Gyeonggi province, and some Chungnam province. In order to investigate resistance breakability against SCPPL, new rice herbicides containing tefuryltrione [p-hydrophenyl pyruvate dioxygenase (HPPD) inhibitor], pyrimisulfan and triafamone[actolactate synthethase (ALS) inhibitor] were tested. In both lab and field experiments, tefuryltrione GR, 4-HPPD inhibitor showed growth retardation with a bleaching on the young leaves of SCPPL at early time after treatment. However, it restored and regerminated with insufficient control effect. On the other hand, pyrimisulfan+mefenacet SC, triafamone+tefuryltrione GR, and ALS inhibitor showed excellent control effect on SU-resistant SCPPL with growth retardation and necrosis. In particular, pyrimisulfan+mefenacet SC showed excellent controlling effect on SU-resistant SCPPL in regional field experiments.

• The Journal of the Korea Contents Association
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• v.16 no.10
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• pp.350-363
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• 2016

The purpose of this study was to examine the relationships between emotional intelligence and job performance. Also, the study explore the effects of self-efficacy as a mediating variable and person-supervisor fit as a moderating variable on the mentioned relationships. In order to verify the assumptions related to this research, a survey of 173 sales representatives working in various organizations was conducted. Survey results supported the assumption that higher emotional intelligence resulted in higher job performance. And another assumption that job performance could be predicted more precisely through mediating effect of self-efficacy. Finally, results revealed that the relationships between emotional intelligence and self-efficacy became stronger when the scores of person-supervisor fit were higher. Theoretical and practical implication were reviewed and limitations of the study and suggestions for future research were discussed.

• The Journal of the Korea Contents Association
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• v.21 no.1
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• pp.579-589
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• 2021

The study is to verify the mediating effect of self-compassion in the relationship between abandonment anxiety and relationship addiction. To this end, a questionnaire survey was conducted on 250 men and women in early adulthood, using the scales of abandonment anxiety, self-compassion, and relationship addiction, of which 237 were used for the final analysis. Descriptive statistics and correlation analysis were performed using the SPSS 21.0 program, and mediating effects were confirmed using the PROCESS macro. The results of the study are as follows. First, abandonment anxiety showed negative correlation with self-compassion, and positive correlation with relationship addiction. Self-compassion showed negative correlation with relationship addiction. Second, in the relationship between abandonment anxiety and relationship addiction, self-compassion showed a partial mediating effect. Through this study, the relationship between abandonment anxiety and relationship addiction and the effectiveness of self-compassion to manage it were confirmed. Based on the results of this study, the significance and limitations of this study and suggestions for subsequent studies were presented.

• The Journal of the Korea Contents Association
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• v.20 no.7
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• pp.516-524
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• 2020

The purpose of this study was conducted to test mediating effects of self-efficacy in the relationship between aggressiveness and smartphone addiction in adolescents. A self-reprting survey was conducted on 665 adolescents. The research findings are as follows: First, there were significant correlations among aggressiveness, smartphone addiction, self-efficacy. Aggressiveness had positively correlations with smartphone addiction. Aggressiveness had a negative correlation with self-efficacy and smartphone addiction had negatively correlation with self-efficacy. Secondly, self-efficacy had a significant partial mediating effect between aggressiveness and smartphone addiction. Based on the results of this study, that the improvement of youth self-efficacy influence on the prevention and solution of smartphone addiction was discussed.

• Journal of the Korean Magnetics Society
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• v.3 no.1
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• pp.29-33
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• 1993

Magnetoresistance was studied for the ferromagnetic tunneling junction in $Permalloy/Al_{2}O_{3}/Co$ prepared by evaporation in a vacuum of $1{\times}10^{-6}$Torr. We measured voltage-current characteristic and magnetic valve effect of prepared ferromagnetic tunneling junction sample. We investigated field-dependency of tunnel resistance by Wheat-stone bridge method and measured magnetic hysteresis curve by vibrating sample magnetometer. The tunneling is confirmed by measuring voltage-current characteristic. The hysteresis curve of magnetoresistance corresponds well with that of magnetization. The magnetoresistance ratio ${\Delta}R/R$ is 0.6% at room temperature.

• Journal of the Korean Magnetics Society
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• v.7 no.1
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• pp.1-6
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• 1997

The frequency dependence of magnetoimpedance (MI) effect in amorphous $Fe_{78}B_{13}Si_9$ alloy has been obtained. Magnetoimpedance (MI) effect is a high-frequency phenomenon, which describes the changes of impedance in any ferromagnetic sample, when a magnetic field is applied on it. MIR (Magnetoimpedance ratios) is defined as $\Delta$ Z/Z ≡ [Z (0) / Z ($H_s$)]-1 where $H_s$ is the saturating field along the long side of the sample, The MIR of the samples annealed in vacuum has been decreased normally except that the sample annealed at 5 MHz has been reached as much as 58%.