• International Journal of Highway Engineering
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• v.17 no.3
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• pp.69-76
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• 2015

PURPOSES : Performance evaluation of four types of asphalt concrete overlays for deteriorated national highways. METHODS : Pavement distress surveys for crack rate and rut depth have been conducted annually using an automated pavement survey vehicle since 2007. Linear and non-linear performance prediction models of the asphalt concrete overlays were developed for 43 sections. The service life of the asphalt overlays was defined as the number of years after which a crack rate of 30% or rut depth of 15mm is observed. RESULTS : The service life of the asphalt overlays was estimated as 17.4 years on an average. In 90.7% of the sections, the service life of the overlays was 15 years or more which is 1.5 times the life of conventional asphalt concrete overlays used in national highways. The performance of the overlays was dependent on the type of asphalt mixture, traffic volume levels, and environmental conditions. CONCLUSIONS : The usage of stone mastic asphalt (SMA) and polymer-modified asphalt (PMA) for the overlays provided good resistance to cracking and rutting development. It is recommended that appropriate asphalt concrete overlays must be applied depending on the type of existing pavement distress.

• The Korean Journal of Health Service Management
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• v.6 no.2
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• pp.91-99
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• 2012

The aims of this study were to investigate the relationship of depression, fatigue and quality of life (QOL) in middle-aged adults in Jinju city. This survey was conducted from October to November, 2010 and 230 responses from the survey were used. The data was analyzed by descriptive statistics, t-test, ANOVA, Pearson correlation, and stepwise multiple regression. The average score of the participants' depression was $13.16{\pm}8.26$ out of 60. the average fatigue score was $21.46{\pm}4.79$ out of 44. The average QOL score was $85.90{\pm}9.49$ out of 130. Among general characteristic of the participants level of QOL was statistically significant for gender, educational level, exercise. There was a significantly corrleation among depression, fatigue and QOL. The results revealed that depression, educational level, exercise were the significant predictors to affect the QOL in middle-aged adults. Low level of depression, higher educational background, and active exercise were closely correlated with QOL. To improve QOL in middle-aged adulthoods for the community, the programs which include lowering depression, encouraging exercise should be designed.

• Journal of agricultural medicine and community health
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• v.33 no.3
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• pp.269-278
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• 2008

= ABSTRACT = Objectives: This study was carried out to identify the relationships of family burden and mental health service needs of chronic mental patients in community. Methods: Objects of the study were 153 chronic mental patients in community of P. city in korea. Data were collected from December, 2007 to February, 2008 using structured questionnaire. Research tools of this study were family burden tool developed by Pai & Kapur (1981) and mental health service needs tool developed by Kim (2003). Results: The average grades for family burden was 1.62 points. And the biggest part of family burden was economic burden(1.74), followed by interrupt of daily life(1.67), interrupt of family relationship(1.64), interrupt of family leisure (1.57), effects of mental health(1.50), and effects of physical health(1.43). The average grades for mental health service needs was 2.72 points. And the biggest part of mental health service needs was rehabilitation service(3.09), followed by social service(2.87), and Psychiatric medical service(2.21). Positive correlation showed between all parts of family burden. And, positive correlation showed between psychiatric medical service and interrupt of daily life(r=.281, p<.01), psychiatric medical service and effects of physical health(r=.355,p<.01), social service and effects of mental health(r=.213,p<.01). Conclusion: The family burden for care giver of mental patients was related with all parts of family burden and mental health service needs of family. Thus, these results should be considered to reduce family burden for care giver of mental patients in community.

• The Korean Journal of Food And Nutrition
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• v.30 no.6
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• pp.1245-1251
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• 2017

The objective of this study is to investigate the satisfaction of elementary, middle and high school nutrition teachers in the Chungnam province concerning the free school food service. We surveyed satisfaction related to policies on school food service and the school food service center. Satisfaction on the school food service center was separated according to four dimensions; perception, food materials, operational system and service. Furthermore, we analyzed factors that affect satisfaction with the school food service center with a multiple regression model. First, satisfaction about the free school food service and dietary life education are higher than the total average of satisfaction with the policy about the school food service. Second, satisfaction about a variety of food materials and reasonable prices are lower than total average of satisfaction with the school food service center. Third, when more teachers have a high level of a positive perception and have higher satisfaction with the operational system of the school food service center, then they also subsequently display higher satisfaction with the school food service center. Therefore it is necessary to improve or make up for pricing and diversity on food materials by the school food service center.

• Journal of the East Asian Society of Dietary Life
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• v.18 no.4
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• pp.592-600
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• 2008

The perceived performance of food management and the food utilization status of school food service managers in nine sectors of management in the Kyunggido area were evaluated[ED highlight - please ensure this is correct]. The results of this study revealed that 84.5% of the service managers used domestic food and $20{\sim}40%$ used organic food, with an average of 80% using one of these types of foods. In addition, the average use of pre-handling food varied widely when compared to other food items[ED highlight - very confusing, please ensure my changes do not alter your intended meaning] Additionally, most respondents used frozen food (72.0%), processed food (83.9%), and substitute food (53.4%), for the average of 20%,[ED highlight - I cannot infer your intended meaning here, what is an average of 20%? Please clarify]; however, 40.6% did not use any food substitutes. The most common reason given for using pre-handled[ED highlight - do you mean pre-packaged or pre-prepared? Please clarify] food was to save time (32.2%), whereas frozen foods were most often used to help with menu organization (37.5%). Additionally, the respondents most common reason for using processed food was its high acceptability (47.8%), while substitute foods were most often used due to non suitable foods beingreturned (75.3%). Among the varieties of food that were used, those that are easily obtained and cooked were used the most. Furthermore, the mean score for the perceived performance of food sanitary management was $4.51{\pm}0.425$ (based on the 5-point Likert scale). Finally, it was generally believed that the overall food management well executed, but that more active management of unsatisfactory food suppliers is required[ED highlight - please ensure my changes do not alter your intended meaning].

• International Journal of Highway Engineering
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• v.20 no.2
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• pp.57-65
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• 2018

PURPOSES : The study aims to predict the service life of national highway asphalt pavements through deep learning methods by using maintenance history data of the National Highway Pavement Management System. METHODS : For the configuration of a deep learning network, this study used Tensorflow 1.5, an open source program which has excellent usability among deep learning frameworks. For the analysis, nine variables of cumulative annual average daily traffic, cumulative equivalent single axle loads, maintenance layer, surface, base, subbase, anti-frost layer, structural number of pavement, and region were selected as input data, while service life was chosen to construct the input layer and output layers as output data. Additionally, for scenario analysis, in this study, a model was formed with four different numbers of 1, 2, 4, and 8 hidden layers and a simulation analysis was performed according to the applicability of the over fitting resolution algorithm. RESULTS : The results of the analysis have shown that regardless of the number of hidden layers, when an over fitting resolution algorithm, such as dropout, is applied, the prediction capability is improved as the coefficient of determination ($R^2$) of the test data increases. Furthermore, the result of the sensitivity analysis of the applicability of region variables demonstrates that estimating service life requires sufficient consideration of regional characteristics as $R^2$ had a maximum of between 0.73 and 0.84, when regional variables where taken into consideration. CONCLUSIONS : As a result, this study proposes that it is possible to precisely predict the service life of national highway pavement sections with the consideration of traffic, pavement thickness, and regional factors and concludes that the use of the prediction of service life is fundamental data in decision making within pavement management systems.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.46 no.1
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• pp.84-90
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• 2023

ASL estimation of public building is based on how appropriate the maximum age of the asset is derived based on the age record of the asset in the statistical data owned by public institutions. This is because we get a 'constrained' ASL by that number. And it is especially true because other studies have assumed that the building is an Iowa curve R3. Also, in this study, the survival rate is 1% as the threshold value at which the survival curve and the predictable life curve almost coincide. Rather than a theoretical basis, in the national statistical survey, the value of residual assets was recognized from the net value of 10% of the acquisition value when the average service life has elapsed, and 1% when doubling the average service life has elapsed. It is based on the setting mentioned above. The biggest constraint in fitting statistical data to the Iowa curve is that the maximum ASL is selected at R3 150%, and the 'constrained' ASL is calculated by the proportional expression on the assumption that the Iowa curve is followed. In like manner constraints were considered. First, the R3 disposal curve for the RCC(reinforced cement concrete) building was prepared according to the discarding method in the 2000 work, and it was jointly worked on with the National Statistical Office to secure the maximum amount of vintage data, but the lacking of sample size must be acknowledged. Even after that, the National Statistical Office and the Bank of Korea have been working on estimating the Iowa curve for each asset class in the I-O table. Another limitation is that the asset classification uses the broad classification of buildings as a subcategory. Second, if there were such assets with a lifespan of 115 years that were acquired in 1905 and disposed of in 2020, these discarded data would be omitted from this ASL calculation. Third, it is difficult to estimate the correct Iowa curve based on the stub-curve even if there is disposal data because Korea has a relatively shorter construction history, accumulated economic wealth since the 1980's. In other words, "constrained" ASL is an under-estimation of its ASL. Considering the fact that Korea was an economically developing country in the past and during rapid economic development, environmental factors such as asset accumulation and economic ability should be considered. Korea has a short period of accumulation of economic wealth, and the history of 'proper' architectures faithful to building regulations and principles is short and as a result, buildings 'not built properly' and 'proper' architectures are mixed. In this study, ASL of RCC public building was estimated at 70 years.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.7
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• pp.332-340
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• 2019

This study examines the influence of pre-service early childhood teacher's social support and adaptability to college life on teacher's efficacy. The study subjects were 394 pre-service early childhood teachers. The instruments were Social Support Scale, Adaptability to College Life Scale and Teacher Efficacy Scale. The collected data were analyzed by using SPSS program. Frequency and percentage were used to determine the general background of the pre-service teachers. To examine social support, adaptability to college life and teacher efficacy of pre-service early childhood teachers, descriptive statistics analysis was conducted. To assess the relationship among social support, adaptability to college life and teacher efficacy of pre-service early childhood teachers, Pearson's correlation analysis was carried out. To examine the effects and relative explanation of esocial support, adaptability to college life and teacher efficacy of pre-service early childhood teachers, multiple regression analysis was conducted. From the study results, first, pre-service early childhood teachers had higher social support, adaptability to college life and teacher efficacy rates than average. Second, there was a positive correlation among social support, adaptability to college life and teacher efficacy of pre-service early childhood teachers. Third, teacher efficacy of pre-service early childhood teachers was influenced by their social support, and adaptability to college life. The study results suggest that a teacher efficacy improvement program for pre-service early childhood teachers should be provided for ensuring their social support. The study results also emphasize the necessity of social support and adaptability to college life improvement program for pre-service early childhood teachers.

• International Journal of Advanced Culture Technology
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• v.10 no.3
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• pp.1-10
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• 2022

This study examined the relationship between depression, anxiety, stress, and adaptation to college life of international students living in South Korea during the COVID-19 pandemic and the factors affecting the adaptation to college life. This study was carried out between December 3, 2021, to January 25, 2022, on international students living in South Korea. The questionnaires were composed of self-reported questionnaires, and the survey URL was sent as text messages to international students who understood the purpose and rationale of this study and consented to participate in the survey. The data were analyzed using SPSS WIN 22.0, and t-test, ANOVA, Pearson's Correlation Coefficient, and hierarchical regression were performed. As a result of the study, the average score of the study subjects was 8.44 points for depression, 8.28 points for anxiety, and 9. 28 points for stress. factors with significant differences in adaptation to college life according to general characteristics were living means and smoking. The relationship between the main variables, it was significant with depression (r=-.785, p<.001), anxiety (r=-.593, p<.001), and stress (r=-.726, p<.001). There was one negative correlation. It was found that the higher the depression, anxiety, and stress, the lower the college life adaptation. Lastly, depression (β=-.666, p<.001) was the factor affecting foreign students' adaptation to college life, and the explanatory power was 62%. Therefore, for international students to adapt to college life, it is necessary to establish an institutional strategy to detect depression, a negative psychological emotion, at an early stage and to systematically manage it. Also, it is necessary to find an intervention plan to relieve depression that can be applied in social isolation situations due to the spread of infectious diseases. Research confirming the intervention effect should be upgraded.

• Journal of the East Asian Society of Dietary Life
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• v.16 no.6
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• pp.753-762
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• 2006

The purpose of this research is to analyze the importance and satisfaction level with the service of Korean restaurants for Japanese and Chinese students in Korea. Self adminstered guestionnaires were collected from 204 Japanese and Chinese students in Korea. The data was statistically analysed using t-tests, one-way ANOVA, reliability test, factor analysis and regression test. The average values of importance-factor and satisfaction-factor were significantly different. Based on analyses of the 20 service level factors, satisfaction level was significantly lower than importance level. Satisfaction-factors such as quality of food, hygiene of restaurant and employees, service level, and atmospheres, significantly influenced the overall satisfaction level of Korean food and restaurants.