• International Journal of Human Ecology
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• 제13권2호
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• pp.1-13
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• 2012

This study examined the effects of academic self-concept (internal factor) and maternal parenting behaviors (external factor) on academic delay of gratification (ADOG). Additionally, models predicting ADOG were compared between Korean and Malaysian children. The participants of this study were 100 Korean third graders and their mothers, and 100 Malaysian third graders and their mothers. The children completed the modified versions of the Academic Delay of Gratification Scale for Children, and Academic Self-Concept Questionnaire. The mothers completed the Parenting Attitude Test. Pearson's correlation tests, independent t-tests, and multiple regression analyses were conducted to test the research hypotheses. The results showed that Korean children reported higher ADOG and academic self-concept scores than that of Malaysian children. Moreover, academic self-concept was found to have a significant positive effect on ADOG among both Korean and Malaysian children. There was no significant gender difference in ADOG for both Korean and Malaysian children. However, the effects of maternal parenting behaviors on ADOG were only detected among the Malaysian children, particularly on Achievement Press. That is, only for the Malaysian children, maternal pressure about academic achievement was found to have a significant positive effect on ADOG. In conclusion, only academic self-concept was found to be a significant predictor explaining the variance in ADOG among Korean children. On the other hand, academic self-concept and maternal parenting behaviors were shown as significant predictors explaining the variance in ADOG among Malaysian children.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.296-296
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• 2015

The aim of this paper is to numerically explore the feasibility of designing a Mini-Hydro turbine. The interest for this kind of horizontal axis turbine relies on its versatility. For instance, in the field of renewable energy, this kind of turbine may be considered for different applications, such as: tidal power, run-of-the-river hydroelectricity, wave energy conversion. It is fundamental to improve the turbine performance and to decrease the equipment costs for achievement of "environmental friendly" solutions and maximization of the "cost-advantage". In the present work, the commercial CFD code ANSYS is used to perform 3D simulations, solving the incompressible Unsteady Reynolds-Averaged Navier-Stokes (U-RANS) equations discretized by means of a finite volume approach. The implicit segregated version of the solver is employed. The pressure-velocity coupling is achieved by means of the SIMPLE algorithm. The convective terms are discretized using a second order accurate upwind scheme, and pressure and viscous terms are discretized by a second-order-accurate centered scheme. A second order implicit time formulation is also used. Turbulence closure is provided by the realizable k - turbulence model. In this study, a mini hydro turbine (3kW) has been considered for utilization of horizontal axis impeller. The turbine performance and flow behavior have been evaluated by means of numerical simulations. Moreover, the performance of the impeller varied in the pressure distribution, torque, rotational speed and power generated by the different number of blades and angles. The model has been validated, comparing numerical results with available experimental data.

• Journal of Nutrition and Health
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• 제46권2호
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• pp.156-165
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• 2013

This study examined how achievement of session goals contributes to outcomes of subjects after participation in a 12-week lifestyle intervention program in men with metabolic syndrome (MetS). Thirty office workers with MetS, aged $47.2{\pm}6.6$ years, participated in this study, from March to July, 2011. The intervention program included face-to-face counseling five times during the 12-week period. Counselors and subjects designed session goals for each round. The average of the goal achievement rate was calculated based on compliance for each round. The subjects were divided into three groups according to their tertiles of achievement rate: Low-compliance group (LC, < 59%), medium-compliance group (MC, 59-70%), and high-compliance group (HC, > 70%). Anthropometry, biochemical index, and nutrient intake were examined at baseline and at the end of the 12-week intervention program. After the intervention, diastolic blood pressure (DBP) showed a significant decrease in the LC group, and waist circumference (WC) showed a significant decrease in the MC group. Systolic blood pressure (SBP), DBP, and low-density lipoprotein cholesterol (LDL) showed a significant decrease in the HI group. Changes in SBP and DBP were significantly lower in the HC group than in the MC group (p < 0.05, p < 0.01). Changes in LDL were significantly lower in the HC group than in the MC group (p < 0.05). Results for intake of total energy, protein, fat, and sodium, as well as rates of carbohydrate and fat intake, showed a significant decrease in all participants (p < 0.05). The change in fiber was significantly higher in the HC group than in the MC group (p < 0.05). The change of fruit serving size showed a significant increase in the HC group (p < 0.01). The number of risk factors for MetS showed a significant decrease in the LC and HC groups (p < 0.05), however, no significant mean differences were observed among the three groups. In conclusion, participation in this intervention program resulted in positive effects on risk factors for MetS, nutrient intake, and dietary habits, especially in the High-compliance group.

• 한국심리학회지 : 문화 및 사회문제
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• 제28권4호
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• pp.529-553
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• 2022

본 연구는 지각된 부모의 학업성취압력과 자녀의 정신건강의 관계에서 정체성 발달의 매개효과를 확인하고자 하였다. 구체적으로, 지각된 부모의 학업성취압력과 자녀의 정신건강 간의 관계가 정체성 발달의 긍정적 측면과 부정적 측면 중 어느 측면을 통해 매개되는지 살펴보았다. 이를 위해 한국 대학생 110명을 대상으로 온라인 설문을 진행하였다. 참여자들은 지각된 부모의 학업성취압력과 정체성 발달, 웰빙, 우울을 묻는 설문지에 응답하였다. 분석 결과, 지각된 부모의 학업성취압력은 참여자의 웰빙과는 부적, 우울과는 정적 상관관계에 있었다. 다음으로, 학업성취압력과 정신건강 관계에서 정체성 발달의 매개효과를 알아본 결과, 정체성 발달의 부정적 측면만이 유의하게 나타났다. 즉, 부모로부터 학업성취압력을 높게 지각한 참여자의 정체성은 제대로 발달하지 않았는데, 이는 곧 낮은 정신건강으로 이어졌다. 본 연구는 자녀가 지각한 부모의 학업성취압력과 자녀의 정신건강 간의 매개변인으로 정체성 발달을 제시하며 정체성 발달의 긍정적 측면과 부정적 측면 중 부정적 측면이 두 변인의 관계를 매개한다는 것을 밝혔다는 점에서 의의가 있다. 연구 결과를 바탕으로 입시 경쟁이 치열한 한국사회에서 정체성 형성 과정에 대한 개입이 부모의 학업성취압력과 자녀의 정신건강 간의 관계에서 부정적 영향력을 상쇄할 수 있는 방안이 될 수 있음을 시사하며 본 연구의 제한점과 후속 연구를 제안하였다.

• 한국수소및신에너지학회논문집
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• 제20권6호
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• pp.464-470
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• 2009

In order to analysis the possibility of high expansion and performance without backfire in a hydrogenfueled engine using external mixture injection, combustion characteristics and performance enhancement were analyzed in terms of retarding valve timing and increasing the boosting pressure. As the results, it was found that thermal efficiency increased by retarding intake valve timing with the same level of supplied energy is over 6.6% by the effect of high expansion including effect of combustion enhancement due to supercharging. It was also shown that the achievement of high power (equal to that of a gasoline engine), low brake specific fuel consumption and low emission (NOx of less than 16 ppm) without backfire in a hydrogen-fueled engine is possible around a boosting pressure of 1.5 bar, intake valve opening time of TDC and $\Phi$=0.35 in fuel-air equivalence ratio.

• 간호행정학회지
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• 제22권1호
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• pp.57-66
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• 2016

Purpose: This exploratory study was done to categorize medical personnel's perceptions of burnout and analyzed the characteristics. Methods: Q methodology was applied using a 45 Q-sample categorized on an 11-point scale which was completed by nurses and doctors working at a university hospital in Seoul, Korea. Collected data were analyzed using the PC-QUANL program. Results: Medical personnel's perceptions of burnout were categorized into three types; 33.83% of the total variance was explained. The first type was 'functionally deteriorating pressure' the second type was 'daily powerlessness' and the third was 'achievement-oriented re-energization'. Conclusion: There is a need to establish and apply intervention strategies for each type to alleviate medical personnel burnout and increase work efficiency to qualitatively improve medical services.

• 설비공학논문집
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• 제13권8호
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• pp.763-770
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• 2001

The high pressure side rotary compressor is investigated in this study. The temperatures at 29 points of main components and the refrigerant and the performance of the instrumented compressor are measured at various operating conditions. The complex heat transfer mechanism between the components, such s cylinder, suction pipe and stator of motor, is fairly clarified. It is also confirmed that the achievement of a high efficiency by reducing the heat transfer loss in the rotary compressor is possible.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.171-172
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• 2017

There is some recognition that Decoration Wood-based Flooring Board in Korea is a material that inhibits the heat transfer from the substrate to the room. There is a lack of substantial research literature on the surface heat transfer and condition of Decoration Wood-based Flooring Board, which is insufficient to deal with false perceptions. In this study, the purpose of this study is to analyze the surface heat transfer characteristics of Decoration Wood-based Flooring Board and to obtain basic data to cope with recognition.

• 가정과삶의질연구
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• 제24권5호
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• pp.251-270
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• 2006

This study examined how the households used and combined financing sources to pay for college education. It compared the probability of using each source (current incomes, saving, education loans and grants) by households' socio-economic characteristics and analyzed which factors influence the decision to use each source and the amounts from each source for financing college education. Data for this study were from a questionnaire completed by 4-year college students (n=623) and were analyzed by t-tests, ANOVA and Heckman's two-step estimation models. The findings of this study were as follows: First, the most frequent source for college education was parents' savings and the second one was parents' incomes. Also, the most frequent combination of sources was saving and current incomes and the second was combination of three sources, saving, incomes and education loans. Second, the probability of using incomes was higher for younger students than for older students. The number of siblings showed significant differences among income, savings and education loans. Those who had higher incomes were more likely to use current incomes, saving, but less likely to borrow for financing college education. Middle-class income groups were more likely to borrow for education. Third, household incomes and asset holdings had generally positive impacts on the probability of using incomes and savings for college education, while total debt burden decreased both the probability and amounts of income and saving sources. The college costs had significantly positive effects on both the probability and the amounts of all of financing sources. Total grants received significantly decreased the amounts from incomes, savings and borrowing sources.

• 한국과학교육학회지
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• 제25권5호
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• pp.547-554
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• 2005

본 연구에서는 고등학교 물리교과의 '기체분자 운동론'단원에 대한 개별 웹 활용 모의실험을 개발 적용하여 과학 수업에 대한 태도, 학습동기, 학업성취도에서 미치는 효과를 조별 전통실험 집단과 비교하여 알아보았다. 농촌지역에 위치한 고등학생(조별 전통실험 집단 1학급, 개별 웹 활용 모의실험 집단 1학급)을 대상으로 기체 분자 운동론 단원에 대하여 실험 처치를 2차시동안 실시하였다. 모의 시험은 기체에 대한 실험에서 눈에 보이지 않는 기체를 시각화하여 눈에 보이는 입자로 표현되었고, 온도 및 압력을 자유롭게 변화시킬 수 있도록 개발되었다. 웹 활용 모의실험 집단은 개발된 모의실험을 이용하여 개별적으로 실험하였고, 전통실험 집단은 교과서에 나오는 실험을 4인 1조로 실시하였다. 사전 검사로 사전 과학 수업에 대한 태도 검사, 사전 학습동기(PALS) 검사, 논리적 사고력 검사를 실시하였다. 실험 처치 후 학생들의 사후 과학 수업에 대한 태도 검사, 사후 학습동기(IMMS) 검사, 학업 성취도 검사를 실시하였고, 자료를 수집하여 공변량 분석을 실시하였다. 분석 결과, 개별 웹 활용 모의실험과 조별 전통실험 집단간의 과학 수업에 대한 태도는 유의미한 차이가 없었다. 또한, 학습동기와 학업 성취도는 개별 웹 활용 모의실험 집단이 조별 전통실험 집단에 비해 유의미하게 높았다.