• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.299-304
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• 2021

This study examined the effects of childcare teachers' empathy, teaching commitment, and feelings of happiness. The subjects were 111 childcare teachers in U city. The frequency, reliability, and correlation analysis were performed using the SPSS 22.0 program, and regression analysis was performed on the causal relationship between the variables. First, the childcare teacher's cognitive empathy factor had a positive effect on the sense of happiness. On the other hand, the emotional empathy factor, a sub-factor of the empathy ability, did not affect the feeling of happiness. Second, the childcare teacher's teaching commitment had a significant positive effect on happiness. This means that a higher cognitive empathy factor, a sub-factor of the childcare teacher's empathy ability, resulted in a higher sense of happiness. Moreover, a higher instructional commitment factor indicated a higher sense of happiness. This study provides basic data for preparing measures to improve the sense of happiness of childcare teachers by grasping the relationship between childcare teachers' empathy ability, teaching commitment, and feelings of happiness.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.38-38
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• 2009

Wafer thickness of crystalline silicon is an important factor which decides a price of solar cell. PC1D was used to fix a condition that is required to get a high efficiency in a crystalline silicon solar cell using thin wafer($150{\mu}m$). In this simulation, base resistivity and emitter doping concentration were used as variables. As a result of the simulation, $V_{oc}$=0.6338(V), $I_{sc}$=5.565(A), $P_{max}$=2.674(W), FF=0.76 and efficiency 17.516(%) were obtained when emitter doping concentration is $5{\times}10^{20}cm^{-3}$, depth factor is 0.04 and sheet resistance is $79.76{\Omega}/square$.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2221-2223
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• 1997

The proposed converter has a merit of simple controlled circuit because the input current control discontinuously. And it is improve to input power factor that the snubber capacitor's energy regenerate to the AC source side. Specially using the discontinuous current mode in the reactor. This topology is reduced a current /voltage stresses of resonant devices in addition to a partial resonant strategy. The result of simulations of the proposed topology included in this paper.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.253-256
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• 2001

$3{\sim}5$ types of proteins were expressed by toluene and heat during $30{\sim}60$min. Generally it is reported that proteins below 10kDa function as transcription factor. In this study we certified that 7kDa was induced by organic solvent and the rate of expression was 2 folds at $30{\sim}45$min.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1997.10a
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• pp.120-126
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• 1997

This paper examines the crack growth behavior of 7075-T651 aluminum alloy under high-low block loading condition. The cantilever beam type specimen with a chevron notch is used in this study. The crack growth and closure are investgated by compliance method. The applied initial stress ratios are R=-0.5, R=0.0 and R=0.25 Crack length($\alpha$), effective stress intensity factor range(ΔKeff), ratio of effective stress intensity factor range(U) and crack growth rate(d$\alpha$/dN) etc. are inspected fracture mechanics estimate.

• Asian-Australasian Journal of Animal Sciences
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• v.23 no.11
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• pp.1412-1420
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• 2010

In this study, changes in testicular tissues of rats subjected to xylene and formaldehyde inhalation were evaluated. Three experimental groups were included in the study. Each group of rats was exposed to formaldehyde (6 ppm), technical xylene (300 ppm) or a combination of these two agents (150 ppm+3 ppm) for 8 weeks (8 h/d). Control groups were maintained for a period of eight weeks under the same conditions. Staining methods (triple staining, strep ABC method) were applied to examine histometric changes and relaxin like factor (RLF) expression in the testicular tissue. Immunostaining for RLF showed that density of staining for RLF decreased in rats exposed to formaldehyde. Formaldehyde or a combination of formaldehyde and xylene led to a decrease in seminiferous epithelial height. In conclusion, exposure of rats to formaldehyde and xylene-formaldehyde combinations adversely affects Leydig cells (RLF) and seminiferous epithelium of testicular tissue.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.397-399
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• 1994

In this parer, the development of input power factor and the harmonic distortion of line current were showed in the proposed three phase AC-DC converter. We identified that DC voltage in the output terminal has fast dynamic response and has nearly ripple. Moreover, the converter also possesses the regenerative capability which is useful for many applications. The switching frequency of this converter operated with constant in the range of 2KHZ. Finally, simulation and experiment results are presented.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.522-524
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• 1994

This paper presents power factor and distortion improvement methods via active boost converter and mode select. This method not only reduces the current and voltage distortion but also the physical size and expected low cost. Optimum parameter values arc derived to minimize the harmonise in the input current. A theoretical analysis, simulation and experimental results arc presented.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.15 no.1
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• pp.54-60
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• 2007

According to U.S. NTSB, from 1989 to 1992, Situation Awareness (SA) was a major factor causing 80% of all aircraft accidents in scheduled airlines. Therefore, the prevention of accidents through effective training in SA became a pivot in aviation safety. Furthermore, during the past 10 years, since all helicopter accidents in Korea were caused by the factors related to SA, an appropriate countermeasure has been required. This study, which uses survey data, examines various factors related to SA that could affect helicopter pilots. Recognition of and countermeasures for the factors in emergency situations were analyzed. The results show that, while the factors associated with SA and vigilance have lower correlations with each other, the factors associated with recognition, diagnosis, and generation and implementation of solutions have higher correlations with each other. Thus, the results demonstrate the need for better SA through educational training.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1052-1054
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• 2001

This paper describes a boost converter to be operated at the boundary of continuous current mode(CCM) and discontinuous current mode(DCM) for power factor correction and low cost. A control method to be utilized in simulation is a average-current mode method in case of operating in CCM. The simulation results show that Better is the CCM converter then the DCM converter in harmonic content and input current waveform. And A Double-boost converter is superior to single-boost converter for input-current harmonic.