• Journal of the Korean Data and Information Science Society
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• v.24 no.5
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• pp.975-987
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• 2013

The Hadoop system was developed by the Apache foundation based on GFS and MapReduce technologies of Google. Many modern systems for managing and processing the big data have been developing based on the Hadoop because the Hadoop was designed for scalability and distributed computing. The R software has been considered as a well-suited analytic tool in the Hadoop based systems because the R is flexible to other languages and has many libraries for complex analyses. We introduced Rhipe which is a R package supporting MapReduce programming easily under the Hadoop system, and implemented a MapReduce program using Rhipe for multiple regression especially. In addition, we compared the computing speeds of our program with the other packages (ff and bigmemory) for processing the large data. The simulation results showed that our program was more fast than ff and bigmemory as the size of data increases.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.2
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• pp.443-461
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• 2014

Overlay routing has emerged as a promising approach to improve reliability and efficiency of the Internet. For one-hop overlay source routing, when a given primary path suffers from the link failure or performance degradation, the source can reroute the traffic to the destination via a strategically placed relay node. However, the over-heavy traffic passing through the same relay node may cause frequent package loss and delay jitter, which can degrade the throughput and utilization of the network. To overcome this problem, we propose a Load-Balanced One-hop Overlay Multipath Routing algorithm (LB-OOMR), in which the traffic is first split at the source edge nodes and then transmitted along multiple one-hop overlay paths. In order to determine an optimal split ratio for the traffic, we formulate the problem as a linear programming (LP) formulation, whose goal is to minimize the worse-case network congestion ratio. Since it is difficult to solve this LP problem in practical time, a heuristic algorithm is introduced to select the relay nodes for constructing the disjoint one-hop overlay paths, which greatly reduces the computational complexity of the LP algorithm. Simulations based on a real ISP network and a synthetic Internet topology show that our proposed algorithm can reduce the network congestion ratio dramatically, and achieve high-quality overlay routing service.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.10
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• pp.4703-4710
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• 2012

The purpose of this study was to examine the impact of the social maturity of sustained sport-for-all participants on their physical and mental health. The subjects in this study were 190 company employees who were selected by convenience sampling from among the residents in Gangwon Province. The selected office workers continued to participate in sport-for-all programs. After a survey was conduced from November 7 to 25, 2011, the statistical package SPSS WIN 18.0 was employed to analyze the collected data. To find out the general characteristics of the subjects, frequency analysis was made, and the reliability test of the instrument and factor analysis were carried out. Descriptive statistics analysis was made by factor, and multiple regression analysis was utilized to look for connections among their variables. As a result, it's found that the social maturity of the sustained sport-for-all participants made a significant difference to their physical health, and that their social maturity made a significant difference to mental health as well. As sustained sport-for-all participation was found to be correlated to their physical and mental health, office workers should be given a chance to participate in sport-for-all on a long-term basis.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.11
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• pp.5539-5543
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• 2012

Objective: The smoking prevalence in Malaysia is high, especially among men and adolescents. This study aimed to determine the prevalence and associated factors towards cigarette smoking among school teachers in Malaysia. Methodology: This study was a school-based cross-sectional study conducted among 495 secondary school teachers. The questionnaire used in this study consisted of 29 questions categorized into two sections: socio-demographic characteristics and smoking behaviour. Data were analyzed using the Statistical Package for the Social Sciences (SPSS) program 13.0. ANOVA; t-tests were used in univariate analysis; multiple linear regression was applied for multivariate analysis. Results: The majority of the participants were female (81.6%), in the age group ranged between 30-39 years (44%), Malay (90.1%), married (89.7%), degree holders (85.1%), with monthly income ranged between 3000-3999 Ringgit Malaysia (33.5%), from urban areas (94.7%), their specialty is social studies (33.9%) and with no family history of cancer (83.6%). The prevalence of smoking among school teachers in Malaysia was found to be 7.8%. Regarding reasons to start smoking among school teachers: the major reason was found to be relaxation (33.3%), followed by stress-relief (28.2%). Univariate analysis showed that sex, educational status, monthly income and residency were significantly associated with smoking among school teachers (p<0.001, p=0.004, p=0.031, p=0.010; respectively). Multivariate analysis showed that gender and marital status were significantly associated with smoking among school teachers (p<0.001, p=0.033; respectively). Conclusion: The prevalence of smoking among school teachers in Malaysia was found to be relatively low. Sex, marital status, educational status, monthly income and residency were significantly associated with smoking among school teachers.

• Culinary science and hospitality research
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• v.21 no.3
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• pp.181-197
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• 2015

This study examined the influence of perceived value, perceived quality, reasonable price of subtropical vegetables on trust, purchase intention and word of mouth among hotel chefs. For this investigation, a survey was carried out targeting hotel chefs in Korea with experience with subtropical vegetables. A total of 380 questionnaires were distributed to selected chefs over 20 days from October 1st to October 20th, 2014, of which 353 valid questionnaires were used after the exclusion of responses missing values or too much weighted tendency. A frequency analysis, factor analysis, correlation analysis, and multiple regression analysis were conducted with the use of the SPSS 18.0 package. The analysis results are as follows. First, perceived value, perceived quality and reasonable price had a positive influence on trust. Second, trust had a positive effect on purchase intention and word of mouth. Third, purchase intention positively influenced word of mouth.

• Culinary science and hospitality research
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• v.15 no.4
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• pp.172-186
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• 2009

This study investigates the relationship between the difference of the importance of physical environment by use behavior and customer satisfaction based on the customers who have visited domestic fine dining restaurants and tries to develop a marketing strategy to promote sales in fine dining restaurant business suffering from the global economic hard times. A survey was conducted to examine the customers who were older than 20 years old and have visited a fine dining restaurant, 'Wood & Brick' and 'Benigni', located at Sejongro Junction in Seoul for 61 days from May 1 to June 30, 2009. SPSS 14.0 statistical package was used to process data. Frequency analysis, reliability test, ANOVA, and multiple regression were executed. The result shows that the difference of the importance of physical environment by use behavior depends on the number of visits per month and the cost per capita. On the relationship between physical environment and customer satisfaction, cleanness, space arrangement, charm, and accessibility have positive effects on customer satisfaction.

• Journal of Families and Better Life
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• v.27 no.6
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• pp.215-227
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• 2009

The subject of this study is a cohort of elderly women who are older than 60 years of age and reside S city in and Jeonnam. The sample size of this study is 386. The statistics used for data analysis were frequency, percentage, mean, standard deviation, reliability, ANOVA, correlation, and multiple regression analysis through the SAS package program. The major study result were as follows. First, the physical satisfaction of elderly women is low, and the life satisfaction of the married group is higher than for the widowed group. Second, according to the results. For the women from the married group, the effect were from economic state, age, and physical satisfaction. There were also significant interaction effects according to economic state$\times$physical satisfaction, age$\times$economic state$\times$physical satisfaction, and age$\times$physical satisfaction. As for women from the widowed group, the effect were from physical satisfaction, economic state, and age. There were also significant interaction effects according to economic state$\times$physical satisfaction, age$\times$physical satisfaction, age$\times$economic state$\times$physical satisfaction, and age$\times$economic state. Fourth, the married group gave significance to life satisfaction, economic state, physical satisfaction, and age. The group of widows gave significance to life satisfaction, physical satisfaction, economic state, and age. The results of this study suggest that we should be concerned about the physical satisfaction of older women and should foster a social atmosphere to establish a positive image of elderly women.

• Journal of the Korea Fashion and Costume Design Association
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• v.14 no.3
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• pp.111-122
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• 2012

This study analyzed the differences in value perception and purchasing intention for natural cosmetics by LOHAS class and investigated what influences people's value perception for natural cosmetics had on their purchasing intention. Total 450 questionnaires were distributed to adults of over 20s to 50s for the period from Dec. 1, 2011 to Dec. 14 and 410 questionnaires were used as analysis data. As for collected data, the statistical package SPSS 18.0 Version was used for factor analysis, frequency analysis, reliability test, one-way ANOVA, Chi-Square test, Scheffe-test, correlations analysis and multiple regression analysis. LOHAS class was divided into three groups (higher, middle and lower) based on LOHAS index. Through factor analysis, the value perception for natural cosmetics were divided into three factors (social value, emotional and functional value perception). The results of this study were obtained as below. First, in case of the value perception for natural cosmetics by LOHAS class, it was demonstrated that the higher LOHAS classes they were, the higher value perception for natural cosmetics (social, emotional and functional value perception) they had. Second, in case of the effects of the value perception for natural cosmetics by LOHAS class on their purchasing intention (intention to use and recommendation of usage), it was found that their value perception influenced their purchasing intention. Social value perception and functional value perception, especially social value perception largely affected the purchasing intention of all LOHAS classes, while emotional value perception didn't affected the purchasing intention.

• Journal of Technologic Dentistry
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• v.13 no.1
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• pp.99-122
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• 1991

This study was conducted to investigate the job satisfaction of the dental technicians and evalate the relationship between it’s scores and certain variables. One hundred eighty dental technicians were sampled from 300 among the 2552 dental technicians by wide distribution method, in September 1990. Data were collected by administering the instrument, the researcher developed for measuring the independent and dependent variables. The statistical methods utilized in this study were one-way analysis of variance, correlation and multiple regression analysis. The data were analyzed by SPSS(Statistical Package for Social Science), utilizing PC. The statistical significance was tested at 0.05 level. The major findings of the study were as follows : 1. The job satisfaction measuring instrument, the researcher developed, could measured the job satisfaction of dental technicians. The Maximum score of the instrument was 125, the highest score of dental technicians was 106, the lowest score was obtained 38, the mean score was 72.228 and standard deviation was 12.804. 2. The personal variables of dental technicians were related with the job satisfaction scores. The job satisfaction scores were positively correlated, at 0.01 level, with the scores of age(r=0.379), year(r=0.218), aptitude(r=0.415), marry(r=0.202), income(r=0.381), career(r=0.316). 3. The family variables scores of dental technicians were not correlated with the job satisfaction scores. 4. The personal characteristics of dental technicians were related with the job satisfaction. The job satisfaction score were positively correlated beyond the significant level, with the cheerfulness scores(r=0.398) and stability scores(r=0.224). 5. The job-related variables of the dental technicians were related with the job satisfaction scores. The correlation coefficient between job satisfaction scores and turnover scores was r=0.23, and quantity scores was r=0.300.

• Korean Journal of Health Education and Promotion
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• v.22 no.2
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• pp.111-124
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• 2005

Objectives: The purpose of this study is to evaluate the impact of psycho-social factors on smoking especially the impact of a social support and stress on smoking among boy's high school students. Methods: This study was conducted by administering a questionnaire to 442 boys' high school students living in Deajeon, Korea. This data were analyzed with the SPSS statistical package using t-test and logistic regression. Major findings of this study are as follows: Results: 1. Analysis of the relationship of smoking, stress and social support: The relationship between stress and smoking and between friend's support and smoking had a positive correlation. But the relationship between parents' support and smoking and between teacher's support and smoking had a negative correlation. 2. Multiple logistic analysis of the impact of stress, social support and general characteristics on smoking: The relationship between stress and smoking had a positive correlation as social support and general characteristics were controlled. In contrast, the relationship between social support -parents', friend's, teacher's support- and smoking had no significant correlations as stress and general characteristics were controlled. The risk factors of smoking of boy's high school students were smoking friends, drinking, a type of school, pocket money per month, and stress. And the most powerful predictor of smoking was smoking friends(OR=12.35). Conclusions: The results showed that the variables affecting mainly on smoking were the personal background -smoking friends, drinking, a type of school, pocket money per month- and stress. Therefore, these findings give useful information for constructing a program against smoking or educating about smoking.