• 한국응급구조학회지
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• 제8권1호
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• pp.57-70
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• 2004

This is an exploratory study to describe drinking patterns and problem drinking and alcohol-related problem in college students. The major purpose of this study is to describe the prevalence of drinking styles, the quantity of alcohol getting drunken and the describe the frequency of drunkenness in the previous 12months prior to the survey, and to examine the patterns of how various drinking behaviors are different by drinking style. We used the scale for measuring problem drinking NAST(1), AUDIT, indicated that males drank more and more and more frequently, and had episodes of drunkenness and more accepting of drinking than females, the amount of alcohol becoming intoxicated, the frequency and quantity of alcohol consumed in the month, and the frequency of intoxicated were significantly different by drinking styles in both sexes. A problem drinking rate, danger drinker 49.3% dependence drinker 3.5% in ADULT and alcohol dependency 9.7% in NAST(1) It will be necessary to discuss about adequate policy and eucation protrams to be able to curb collegiate's alcohol abuse.

• 경영과학
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• 제25권1호
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• pp.29-41
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• 2008

In the mobile communication service market, this study represents an attempt to forecast the subscribers of the IMT-2000 service market using the questionnaire of experts which is the qualitative technique is used. In this study, by using the substitution model of next generations among products in order to analyze the IMT-2000 demand of service, a demand was predicted. And by estimating the market demand prospect in which it becomes the important factor of the IMT-2000 service diffusion according to each bandwidth frequency the politically necessary approaching direction about the frequency was presented. It will be able to become the important part to not only the business carrier but also the policy maker to examine a prospect toward the subscriber of the IMT-2000 service. As a result, the market demand was exposed to be most big when the SKT 800MHz, and the KTF 800(900)MHz were used as the additional frequency. And it was likely to reach to the IMT-2000 number of subscribers to about 35.750 thousand peoples in the future at 2015.

• Industrial Engineering and Management Systems
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• 제11권1호
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• pp.48-53
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• 2012

Due to the customer needs of reducing cost and delivery date shorting, prompt change in the production plan became more important. In the multi period system (For instance, production line.) where target processing time exists, production, idle and delay risks occur repeatedly for multiple periods. In such situations, delay of one process may influence the delivery date of an entire process. In this paper, we discuss the minimum expected cost of the case mentioned above, where the risk depends on the previous situation and occurs repeatedly for multiple periods. This paper considers the optimal switching frequency to minimize the total expected cost of the production process. In this paper, first, the optimal switching frequency model is proposed. Next, the mathematic formulation of the total expectation is presented. Finally, the policy of optimal switching frequency is investigated by numerical experiments.

• 한국수자원학회논문집
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• 제55권3호
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• pp.177-189
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• 2022

본 연구는 저빈도·고강도의 확률강우량 산정을 위해, 대규모 기후 앙상블 모의실험으로 생성된 d4PDF (Data for Policy Decision Making for Future Change)를 적용하는 것을 목적으로 수행되었다. 또한, d4PDF를 이용하여 산정된 확률강우량과 관측 자료 및 빈도해석을 통해서 산정된 확률강우량을 비교함으로써 빈도해석 과정의 적용에 따라 발생하는 불확실성을 분석하였다. 이와 같은 연구는 금산, 임실, 전주, 장수 관측소를 대상으로 수행되었다. d4PDF 자료는 총 50개의 앙상블로 구성되어있으며, 하나의 앙상블은 60년동안의 기상자료를 제공하기 때문에 한 지점에서 3,000개의 연 최대 일 강우량을 수집하는 것이 가능했다. 이와 같은 d4PDF의 특징을 토대로 본 연구는 빈도해석 방법을 적용하지 않고, 3000개의 연 최대 일강수량을 비모수적 접근법(Non-parametric approach)에 따라 규모별로 나열하여, 10년부터 1000년의 재현기간을 갖는 확률강우량을 산정했다. 그 후, 관측 자료와 Gumbel 및 GEV (General extreme value) 분포를 토대로 산정된 확률강우량과의 편차를 산정하였다. 그 결과, 재현기간과 관측 기간의 차이가 증가할수록 이 편차가 증가하였으며, 이 결과는 짧은 관측 기간과 빈도해석의 적용은 재현기간이 증가할수록 신뢰하기 어려운 확률강우량을 제시한다는 것을 의미한다. 반면에, d4PDF는 대규모 표본을 이용함으로써 이와 같은 불확실성을 최소화시켜 합리적인 저빈도·고강도의 확률강우량을 제시하였다.

• 한국치위생학회지
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• 제16권3호
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• pp.435-446
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• 2016

Objectives: The purpose of the this study is to investigate parenting stress of married dental hygienists having preschool and school aged children. Methods: A self-reported questionnaire was completed by 242 married dental hygienists from September to December, 2015 via e-mail and ordinary mail. The questionnaire consisted of demographics, job-related characteristics, family life satisfaction, and parenting stress. The data were analyzed using Stata 13.0 program. Results: As for job-related characteristics, 36.6% of the subjects answered 'not possible' in work hour flexibility. The reasons why family-work balance is difficult were 'parenting and education(58.7%)' and 'burden of family-work balance(32.4%)'. Family life satisfaction was 3.03, and parenting stress was 2.41. Parenting stress gets higher if their children are younger, monthly income is lower, and mother/father's age are lower. And parenting stress becomes higher if their career as dental hygienists is less, they are contract worker, and frequency to change jobs is higher. Concerning the reason why work-family balance is difficult, parenting stress is found to be high when they choose 'parenting and education', 'burdens of work-family balance', and 'relationship in workplace'. Family life satisfaction reduced parenting stress. According to the results of multiple linear regression analysis, frequency to change job influences parenting stress. Conclusions: Parenting stress increases turnover and career interruption of married dental hygienists. It is hard to improve work environment without policy support. It will be necessary to establish policy for employed mothers and create a work atmosphere where the policy can be utilized without difficulty.

• 한국정보과학회논문지:시스템및이론
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• 제29권6호
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• pp.346-353
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• 2002

월드 와이드 웹 사용의 폭발적인 증가는 네트워크 트래픽과 서버 부하의 급격한 증가를 초래 하였다. 이러한 문제를 해결하기 위해 웹 프락시 캐싱 기술은 빈번히 요청되는 웹 문서를 사용자와 인접한 위치에 설치된 프락시(proxy)에 저장한다. 캐시 성능을 결정짓는 가장 중요한 요소는 캐시 교체 정책으로서, 가까운 미래에 빈번히 요청될 문서들을 저장하기 위해 사용된다. 캐시 교체 정책이 문서의 인기도를 정확히 예측하기 위해서는 웹 프락시 워크로드의 특성을 반영하는 것이 중요하다. 시간 지역성과 Zipf 빈도 분포는 웹 프락시 워크로드에서 빈번히 관찰되는 특성으로서 문서의 인기도를 예측하기 위한 중요한 속성들이다. 본 논문은 1) LFU를 기반으로 하여 Zipf 빈도 분포를 반영하며, 2) 문서들의 시간에 따른 인기도 감소를 효율적으로 측정하여 시간 지역성을 적응적으로 반영하는 적응형 LFU(ALFU) 캐시 교체 정책을 제안한다. 트레이스 기반의 모의 실험을 통해 다른 교체 정책들과 ALFU를 비교 분석한다. 실험 결과, ALFU는 다른 교체 정책보다 우수한 성능을 보였다.

• 지역사회간호학회지
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• 제24권4호
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• pp.438-450
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• 2013

Purpose: The purpose of this study is to identify relationships between acculturation, social network, and health-related quality of life (HRQOL) among Korean-Chinese immigrants. Methods: A cross-sectional descriptive study was conducted with 147 Korean-Chinese immigrants who were residing more than 1 year in Korea. Physical and mental dimensions of HRQOL were assessed by Short Form-12 Health Survey that consisted of a physical component summary (PCS) and a mental component summary (MCS). Data were analyzed with Pearson's correlation and multiple regression. Results: The mean PCS score was $41.14{\pm}10.72$ and the mean MCS score was $49.09{\pm}11.31$ (possible range 10-70). Depression (${\beta}$=-6.43) and Social network frequency (${\beta}$=2.44) explained 28.4% of the variance in PCS while depression (${\beta}$=-11.54) and visiting clinic/hospital (${\beta}$=-4.00) explained 34.3% of the variance in MCS. Acculturation was not significantly associated with HRQOL. Conclusion: This study confirmed that the social network frequency influences HRQOL among Korean-Chinese Immigrants. The findings suggest that social network analysis should be considered in the process of developing health intervention strategies for Korean-Chinese immigrants.

• 한국보건간호학회지
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• 제22권1호
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• pp.5-17
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• 2008

Purpose: To understand the dietary habits and factors influencing the dietary habits in adults of an urban community. Method: The data were collected via questionnaires that investigated dietary habits, health behaviors, health-related factors, and general characteristics. A total of 302 subjects were selected from those who had visited an urban public center over a 2-week period. The data of 294 subjects were analyzed using descriptive analysis, t-test, ANOVA, and multiple regression, after 8 questionnaire were excluded due to incomplete data. Results: The degree of dietary habits was in the middle range. The most positive dietary habit was 'intake fibers from vegetables, fruits, and cereals', followed by 'not enjoy salty food and salt' and 'eating breakfast everyday'. The significant predictors influencing dietary habits were age, present smoking behavior, perceived health status, and drinking frequency, and these variables accounted for 27.3% of the variance in the dietary habits score. Conclusion: Health care providers should focus on health promotion planning regarding dietary habits and other health-related behaviors in combination and use integrated strategies regarding the factors that influence dietary habits and other health-related behaviors.

• 한국환경보건학회지
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• 제49권2호
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• pp.57-65
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• 2023

Background: The association between exposure to extremely low frequency-magnetic fields (ELF-MF) and childhood leukemia has been controversial. There is a need to clarify this relationship by summarizing key conclusions from systematic review articles. Objectives: The major aim of this study is to summarize key conclusions from systematic review articles on the association between exposure to ELF-MF and childhood leukemia based on childhood exposure to ELF-MF, proximity from childhood household to high voltage cables, and parental occupational exposure to ELF-MF. Methods: This study was conducted through a brief literature review focusing on systematic, meta-analysis, and pooled analysis methods. We conducted a literature search in PubMed using the key words "ELF-MF" and "childhood leukemia" singly or combined. Results: In 2002, the World Health Organization (WHO)'s International Agency for Research on Cancer (IARC) reviewed two manuscripts to conduct pooled analysis and concluded that there is a significant association between exposure to >0.3 μT or 0.4 μT and childhood leukemia. We found a total of four manuscripts for systematic or pool analysis that have been published since the IARC's conclusion. They consistently concluded that there was a significant association between exposure to >0.4 μT and childhood leukemia compared to ELF-MF exposure to below 0.1 μT. The proximity of children's households to high voltage cable lines and occupational exposure by their parents to ELF-MF during certain periods prior to or during pregnancy were inconsistently associated with childhood leukemia. The study found that many EU countries have implemented precautionary policies to prevent potential childhood leukemia due to exposure to ELF-MF. Conclusions: This study recommends implementing a precautionary policy that includes legal exposure limits for ELF-MF to minimize exposure to ELF-MF.

• 한국문헌정보학회지
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• 제58권1호
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• pp.285-302
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• 2024

장서개발 정책은 도서관 서비스의 근간이며, 도서관의 성격과 정체성이 드러나는 성문화된 문서이다. 본 연구에서는 국립중앙도서관에서 원문 추출이 가능한 장서개발 정책 관련 원문 11개를 대상으로 빈도분석, 토픽 모델링, 네트워크 분석을 수행하였다. 장서개발 정책과 관련된 주요 키워드를 추출하고, 해당 키워드 간의 관계를 분석하였다. 그 후 대학도서관과 공공도서관의 관종별 장서개발 정책의 특징을 도출하기 위해 파이 계수 분석을 수행하였다. 분석 결과 '자료', '도서관', '장서개발', '이용자', '수집' 등의 키워드가 빈도 분석과 네트워크 중심성에서 주요 키워드로 나타났으며, 파이 계수 분석 결과 대학도서관은 '대학(0.73)', '구축', '학생', '대상', '비용' 등의 키워드가 나타나므로, 이용자의 학술적 요구와 디지털 자원에 대한 논의가, 공공도서관은 '성인', '설문조사', '특징', '종교' 등 다양한 이용자계층의 정보 요구와 관련된 키워드가 주요 쟁점으로 드러났다.