• Transactions of the Korean Society of Automotive Engineers
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• v.19 no.3
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• pp.57-64
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• 2011

In general, the durability performance of a large-sized military truck has been checked through a field durability test which required many man-hours and costs. To reduce these expenses, the durability analysis using a VTL(Virtual Test Lab) at an initial design stage was introduced recently. In this paper, the VTL with a multi-post testrig template for a large-sized truck was developed to compute the load histories transferred to cabin and chassis frame. The VTL consisted of trimmed FE models of cabin, chassis frame, and deck, dynamic models of front and rear suspensions, and a 8-post testrig template. The basic characteristics of the VTL were correlated with experimental results which had been extracted from actual driving test, modal test, and static weight test. The fatigue analysis using MSM(Modal Superposition Method) was applied to evaluate the durability performance of a large-sized military truck. From a series of analytic methods, it is shown that the fatigue analysis process using the VTL could be a useful tool to estimate the fatigue lives and weak areas of a large-sized military truck.

• Korean Journal of Occupational Health Nursing
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• v.26 no.3
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• pp.151-159
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• 2017

Purpose: The purpose of this study was to identify the effects of service orientation on the organizational commitment and management performance of public health center workers. Methods: A cross-sectional survey design was used. A convenience sample of 280 workers was recruited from six public health centers in J province, South Korea. Data were collected by self-report questionnaires, including general characteristics, service orientation, organizational commitment, and management performance. Data were analyzed with descriptive statistics, Pearson correlation coefficients, independent t-test, one-way ANOVA, and hierarchical regression using the SPSS 22.0 program. Results: The service orientations explained 34.1%of the variance in organizational commitment and explained 31.4% of the variance in management performance. The service orientation was a significant predictor of organizational commitment and management performance. Conclusion: The results of this study suggest that better strategies for service orientations will be helpful to enhance organizational commitment and management performance in the public health center.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.4
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• pp.163-171
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• 2020

The study aims to examine the effects of inward every presence of foreign investment, import, and real exchange rate shocks on export performance in Vietnam. This study employs a time-series sample dataset in the period of 2009 - 2018. All data are collected from the General Statistics Office of Ministry of Planning and Investment in Vietnam, World Development Indicator and Ministry of Finance, State Bank of Vietnam. This study employs the Augmented Dickey-Fuller test and the vector error correction model with the analysis of cointegration. The results demonstrate that a higher value of import significantly accelerates export performance in the short run, but insignificantly generates in the long run. When the volume of registered foreign investment goes up, the export performance will predominantly decrease in the both short run and long run. Historically, countries worldwide are more likely to devaluate their currencies in order to support export performance. According to the study, the exchange rate volatility has an effect on the external trade in the long run but no effect in the short run. Finally, Vietnam's export performance converges on its long-run equilibrium by roughly 6.3% with the speed adjustment via a combination of import, every presence of foreign investment, and real exchange rate fluctuations.

• Journal of the Korean Home Economics Association
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• v.42 no.4
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• pp.69-84
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• 2004

The purpose of this study was to compare the grandmothers' role performance toward their grandchildren in the elementary school between working and nonworking mother families. The subjects were 274 grandparent-grandchild pairs. The structured questionnaires, from both grandmothers and grandchildren were collected in 2001. Using statistical techniques such as factor analysis, t-test, Pearson's correlation, and multiple regression analysis, the major findings were as fellows: 1) The level of the grandmothers' role performance is moderate in general. However, the grandmothers in working mother families perform surrogate mother roles more strongly than the grandmothers in nonworking mother families.2) While contact between grandmother and grandchild is associated with the grandmother's role performance in working mother families, the grandmother's age and the closeness between grandmother and mother are related to the level of the grandmother's role performance in nonworking mother families. In conclusion, the grandmothers' role performance in working mother families was found to be more important in the supporting system than in nonworking mother families.

• Journal of muscle and joint health
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• v.27 no.1
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• pp.41-49
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• 2020

Purpose: This study was a descriptive correlation research to identify the relationships between nursing performance, compassion fatigue, and job stress in emergency room nurses and to provide basic data on reducing job stress in emergency room nurses. Methods: For the research, this study collected data from August 4 to September 26 with 133 nurses who worked at emergency rooms at 3 general hospitals in Gyeonggi-do with 500 beds, and analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficient with the SPSS 21.0 program. Results: Correlation analysis between nursing performance, compassion fatigue, and job stress demonstrated that the job stress had a significant positive correlation with compassion fatigue and nursing performance. On the other hand, there was no statistically significant correlation between compassion fatigue and nursing performance. Conclusion: The study results showed that the emergency room nurse experienced job stress due to intensive compassion fatigue and nursing performance. Thus, it is necessary to develop intervention programs to reduce job stress in emergency room nurses by alleviating compassion stress and having moderate level of nursing performance.

• English Language & Literature Teaching
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• v.11 no.4
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• pp.139-166
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• 2005

The aim of this study was to examine the effects of remedial instruction on self-efficacy improvement in elementary school students with low self-efficacy, which may have been formed through negative experience with learning such as poor performance and poor grades. Nine 6th grade students with low self-efficacy were selected for the present study. A remedial class was set up and instruction was given once a week for 14 weeks. The purpose of the remedial class was to give the students a positive experience with English learning and have students reflect on their achievement. The contents and class activities were adjusted to the subjects' English abilities and also closely related to those of the regular classes so that students could have more confidence during regular English classes. The data were collected from a test of self-efficacy in English learning, achievement tests given before and after the experiment, achievement tests after each lesson, a general self-efficacy test, a basic questionnaire, interviews, journals, and students' self-evaluation. The results showed that the remedial instruction was very successful in providing students with a sense of achievement and improving students' self-efficacy in English learning. However, this study failed to find significant improvement in general self-efficacy tests and achievement tests given before and after the experiments. A longer period of remedial instruction may have been necessary to obtain more concrete results from the variety of data collected.

• Research in Community and Public Health Nursing
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• v.8 no.2
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• pp.250-261
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• 1997

In Korea, visiting nursing services in pubic health centers have been in place since 1991. The purpose of this study is to compare the job characteristics, job motivation and job performance between visiting nurses and other public health nurses. 196 subjects were sent mailed questionnaires from Aug. to Sep., 1997. The response rate was 65.3%. Data were analyzed by a SPSSWIN program with a t-test, $X^2-test$, ANCOVA. The results were as follows : 1. The level of job ability in visiting nurses was higher than that of other public health nurses, but it was an insignificant difference(t=1.5975, p=.2078). Among job characteristics, skill variety was significantly higher in other public health nurses(t=8.2121, p=.0046); autonomy and feedback were significantly higher in visiting nurses(t=8.1877, p=.0047/t=7.7026, p=.0085). 2. There was no significant difference in the level of job motivation(t=.6485, p=.4216) and in job performance between the two groups (t=2.7393, p=.0995). In job performance, general nursing and organizational jobs were significantly higher in other public health nurses (t=4.8486, p=.1288/t=9.4237, p=.0024). 3. It was reconfirmed that there was, a significant difference in the level of skill variety, autonomy and feedback in analyzing age and career as covariates. 4. Significant positive relationship was found in job characteristics and job motivation(r=.5488, p=.0000). No significant relationship was found in job characteristics and job performance(r=.0486, p=.498). Through these results, it was supported that there were differences in some of the job characteristics and job performance between visiting nurses and other public health nurses. Therefore, it is requested to redesign job standards, training programs and management styles focusing on the job characteristics of visiting nurses.

• Journal of Korea Port Economic Association
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• v.35 no.4
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• pp.31-50
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• 2019

The retail industry has been coping with changes in the retail market environment for the past decade or so. Using a total of 14 companies, this study aims to reveal the effect of differences in sales channels and retail business styles on the management performance of retail companies. The financial statements of these companies were used to analyze the five key indicators of their management performance. As research variables, sales channels, retail business style and business period were used as factors affecting their management performance. ANOVA or MANOVA was performed to test differences in management performance between groups according to the number of factors. The effect of three factors on the management performance of retail companies was found to be significant. The multi-comparison test revealed significant differences among retail business styles in terms of the five key indicators. TV home-shopping performed better than others in terms of stability and profitability. Internet and mobile shopping companies performed poorly in terms of profitability compared to others and performed higher than department stores in terms of growth, activity, and productivity.

• Journal of the Korea Convergence Society
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• v.12 no.11
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• pp.155-160
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• 2021

This study analyzed the awareness and performance of physical therapists' infection control using IPA. The four areas were divided into handwashing, personal management, Treatment room environment management, and infection control education, and a survey was conducted on awareness and practice. General characteristics were analyzed for frequency, and recognition and performance were analyzed through paired t-test and Pearson's correlation. Handwashing was both high and infection, control education had high performance, but low awareness. The performance of Treatment room environment was high, but the awareness was low, and personal management was both low. Therefore, based on this study, there is a need for a strategy to improve the awareness of infection control education, a strategy to improve performance in the treatment room environment, and a strategy to improve both performance and awareness in Personal management.

• Journal of Advanced Marine Engineering and Technology
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• v.22 no.1
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• pp.67-76
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• 1998

Friction materials for brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat, and then either to absorb or to dissipate heat. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. In this study, Al powder, Al bronze powder and Mo powder used in general for automobile brake was sprayed on automobile brake disc to restrain rust and to maintain friction performance. Dynamo and corrosion tests have been carried out. It is concluded that the sprayed disc with Al bronze powder has the most improved frictional performance and anti-corrosive characteristics. The main results obtained can be summarized as follows; 1. From the corrosion current density test for gray cast iron and sprayed disc with powders of Al, Al bronze and Mo, it was cleared that the spray treatment with Al bronze powder showed the most superior anti-corrosive characteristics than other powders. 2. By anode polarization toward the noble direction from corrosion potential, corrosion current density with sprayed brake disc by Al-bronze powder was the lowest. 3. Mean frictional coefficients obtained from dynamo test are as follows : the sprayed disc with Al(99.99%) powder was 0.190 ; the sprayed disc with Al-bronze powder was 0.312 ; the sprayed disc with Mo powder was 0.257 ; the non-sprayed disc of gray cast iron was 0.331. In the case of the sprayed disc Al-bronze powder showed the most excellent frictional characteristics . 4. Amount of burnish quantity obtained from burnish test by dynamometer is as follows : the sprayed disc with Al-powder was 1.079 mm : the sprayed disc with Al-bronze powder was 0.155 mm : the sprayed disc with Mo powder was 0.253 mm : the non-sprayed disc of gray cast iron was 0.241 mm. Al-bronze powder also showed the most excellent burnish characteristics.