• Journal of the Korean Data and Information Science Society
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• 제24권5호
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• pp.975-987
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• 2013

최근 Hadoop은 빅데이터의 저장, 처리 및 분석을 위한 표준시스템으로 인식되고 있으며, 많은 빅데이터 관련 시스템들이 Hadoop에 기반하여 구축되고 있다. 또한 R은 다른 소프트웨어와의 연동이 쉽고 다양한 분석 라이브러리들을 탑재하고 있어서 Hadoop 환경하에서 빅데이터의 분석을 위한 공통 분석 플렛폼으로 여겨지고 있다. 본 논문에서는 Hadoop 환경에서 분산 데이터 처리를 위한 R패키지인 Rhipe를 소개하고 빅데이터를 이용한 병렬 다중회귀분석을 위해 MapReduce 프로그램을 작성하는 방법을 예시하였다. 또한 시뮬레이션을 통해 기존의 대용량처리를 위한 R 분석패키지인 ff와 bigmemory와의 연산속도를 비교하였으며, 데이터의 크기가 커짐에 따라 Rhipe를 이용한 MapReduce 프로그램의 계산속도가 ff와 bigmemory에 비해 우수함을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권2호
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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.

• 한국산학기술학회논문지
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• 제13권10호
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• pp.4703-4710
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• 2012

본 연구는 지속적인 생활스포츠 참여자의 사회적 성숙이 신체적 정신적 건강에 미치는 영향을 알아보고자 시행하였다. 대상자는 지속적으로 생활체육프로그램에 참가하고 있는 강원도 거주 직장인들로써 2011년 11월 7일부터 25일까지 편의추출법을 이용하여 190명을 설문조사하였고 SPSS WIN 18.0 프로그램을 활용하여 빈도분석과 측정도구의 신뢰도 및 요인분석 실시로 조사 대상자의 일반적 특성을 조사(하고), 각 요인에 대한 기술통계분석과 변수간의 관계를 위한 상관관계 다중회귀분석을 실시하였다. 직장인의 지속적인 생활스포츠 참여로 인한 사회적 성숙은 신체적 정신적 건강에 유의한 차이가 있었다. 지속적인 생활스포츠 참여가 직장인의 신체적 건강과 정신적 건강 간의 상관관계가 있는 것으로 나타났다. 그러므로 직장인들에게 지속적인 생활스포츠 참여 기회를 부여하는 것이 필요하다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권11호
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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.

• 한국조리학회지
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• 제21권3호
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• pp.181-197
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• 2015

본 연구를 수행하기 위하여 호텔 조리사들의 아열대 채소에 대한 인지된 가치, 품질, 가격에 대한 인식을 조사하여 조리사들의 아열대 채소에 대한 신뢰와 이용의도, 구전의도 등을 조사하였다. 이 연구를 수행하기 위하여 서울 시내에 있는 호텔 조리사 중 아열대 채소를 경험해본 조리사들을 대상으로 연구를 진행하였다. 2014년 10월 1일부터 20까지 총 20일 동안 380부의 설문을 배포하여 불성실한 응답을 제외하고 총 353개의 설문을 분석에 이용하였다. 353개의 설문을 가지고, 빈도분석, 요인분석, 상관관계분석, 회귀분석을 실시하였다. 분석결과, 아열대 채소의 지각된 가치, 지각된 품질, 합리적 가격요인은 신뢰에 긍정적인 영향을 주었고, 신뢰는 구매의도와 구전의도에 긍정적인 영향을 주었다. 마지막으로 구매 의도는 구전에 긍정적인 영향을 주었다. 그러므로 아열대 채소의 품질을 높이고, 가격을 합리적인 수준으로 생산량을 늘리고, 제품에 대한 영양적, 기능적 연구에 노력하여 좋은 식재료가 될 수 있도록 노력해야 한다.

• 한국조리학회지
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• 제15권4호
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• pp.172-186
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• 2009

본 연구에서는 국내 파인다이닝 레스토랑을 이용한 경험이 있는 소비자를 대상으로 이용 행태에 따른 물리적 환경의 중요도 차이와 고객 만족과의 관계를 파악하여 경기 불황으로 인해 어려움을 겪고 있는 파인다이닝 레스토랑 업계의 영업활성화를 위한 마케팅 전략 수립에 도움을 주고자 한다. 설문조사는 2009년 5월 1일부터 6월 30일까지 61일간 저녁 시간대에 실시하였으며, 서울 세종로 사거리에 위치한 파인다이닝 레스토랑 'Wood & Brick'과 'Benigni'를 방문한 서울지역 20세 이상 남녀 내국인 거주자를 대상으로 하였다. 자료의 처리는 SPSS 14.0 통계패키지를 사용하여 빈도분석, 신뢰도 검증, 요인분석, ANOVA, 다중회귀분석을 사용하였다. 그 결과 이용 행태에 따른 물리적 환경 중요도 차이는 월평균 이용 횟수와 1인당 이용 비용에 따라 차이가 나타났으며, 물리적 환경과 고객 만족과의 영향 관계에서는 청결성, 공간 배치, 매력성, 접근성이 고객 만족에 긍정적인 영향을 미치는 것으로 나타났다.

• 가정과삶의질연구
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• 제27권6호
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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.

• 한국의상디자인학회지
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• 제14권3호
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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.

• 대한치과기공학회지
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• 제13권1호
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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.

• 보건교육건강증진학회지
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• 제22권2호
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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.