• 한국시뮬레이션학회논문지
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• 제11권1호
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• pp.11-22
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• 2002

In this paper, a RAID system is modeled and simulated by using the DEVS formalism. The RAID system interacts with a host system by using the high-speed Fibre channel protocol and stores data in an array of IDE disks. The DAVS formalism specifies discrete event systems in a hierarchical, modular manner. The RAID system model is composed of three units: primary-PCI unit, secondary-PCI unit and MCU unit. The primary-PCI unit interfaces with the host system and I/O data caches. The secondary-PCI unit includes disks. The MCU unit controls overall system. The control algorithm of MCU and PCI transactions are analyzed and modeled, From the analysis of simulation events, we can conclude that the proposed model satisfies given requirements.

• 한국식생활문화학회지
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• 제25권6호
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• pp.755-763
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• 2010

The purpose of this study was to select market variables that a foodservice company should consider when expanding overseas and to regional market analysis by variables. Twenty-three different variables were derived from 17 previous studies. These were: population, urbanization rate, women employed, enrollment in tertiary education, gross domestic product, value added by service, total number of mobile cellular telephone subscribers, number of internet users, total Asian highway, inward foreign direct investment, total service imports, inflation rate, international tourist arrivals, energy use by industry, growth rates of the food consumer price index, access to urban sanitation, per capita total expenditure on health, male life expectancy at birth, adult literacy rate, contributing women family workers, passenger car, and country risk assessment. The selected variables were collected as secondary data from the UN, Asian Development Bank, International Bank for Reconstruction and Development, and Michigan State University.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2023년도 제68차 하계학술대회논문집 31권2호
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• pp.377-380
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• 2023

본 논문에서는 중등 교육에 적합한 데이터 리터러시 핵심 역량을 도출하기 위해 국내외 중등 교육과정의 내용을 분석하였다. 고등 교육 졸업생들을 대상으로 개발된 기존 데이터 리터러시 역량 프레임워크를 분석 매트릭스로하여 한국, 영국, 호주, 싱가포르, CSTA의 교육과정 내용을 분석한 결과, 중등 교육과정에서 공통적으로 나타나는 역량과 기존 프레임워크에 있으나 중등 교육과정에는 포함되지 않은 역량, 기존 프레임워크에 없지만 중등 교육과정에서 공통적으로 나타나는 내용 등을 확인할 수 있었다.

• Educational Technology International
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• 제24권2호
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• pp.115-141
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• 2023

The aim of this research is to understand the perceptions of primary and secondary teachers regarding educational resource sharing systems(ERS) by using a qualitative approach. This study conducted Focus Group Interview(FGI) with 20 primary and secondary school teachers. Interview data were analyzed through inductive content analysis method. The results are as follows. First, teachers placed significant emphasis on high-quality, convenient functions, and reward system for sharing resources. Specifically, teachers identified the necessity for a diverse array of materials, systematic categorization of these resources, and the provision of monetary compensation as essential components. Second, the study participants advocated strategies for revitalizing ERS including enhancing accessibility, constructing user-friendly features, increasing awareness, and establishing a reward system to incentivize the resource sharing. In particular, teachers proposed strategies such as developing mobile-based services and AIdriven data recommendation system. These results provide actionable insights for stakeholders engaged in the design, implementation, and evaluation of resource sharing platforms.

• 대한간호학회지
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• 제50권4호
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• pp.631-640
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• 2020

Purpose: This study aimed to examine premenstrual symptoms (PMS) of shift nurses and identify the association between PMS, sleep, and occupational stress. Methods: This study was conducted with a secondary data analysis that used data from the Shift Work Nurse's Health and Turnover study. The participants were 258 nurses who were working in shifts including night shifts. PMS, sleep patterns (sleep time and sleep time variability), sleep quality, and the occupational stress of each participant were measured using the Moos Menstrual Distress Questionnaire, a sleep diary, an actigraph, the Insomnia Severity Index, and the Korean Occupational Stress Scale, respectively. Data were analyzed using SPSS 23 and STATA 15.1 to obtain descriptive statistics, Pearson's correlation coefficients, multiple linear regression with generalized estimating equations (GEE) and Baron and Kenny's mediating analysis. Results: The average PMS score, average sleep time, average sleep time variability, average sleep quality score, and average occupational stress score of the participants was 53.95 ± 40.45, 7.52 ± 0.89 hours, 32.84 ± 8.43%, 12.34 ± 5.95, and 49.89 ± 8.98, respectively. A multiple linear regression analysis with GEE indicated that sleep time variability (B = 0.86, p = .001), and sleep quality (B = 2.36, p < .001) had negative effects on nurses' PMS. We also found that sleep quality had a complete mediating effect in the relationship between occupational stress and PMS. Conclusion: These findings indicate that both sleep time variability and sleep quality are important factors associated with PMS among shift work nurses. To improve shift nurses' PMS status, strategies are urgently needed to decrease sleep time variability and increase sleep quality.

• 융합정보논문지
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• 제10권1호
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• pp.51-59
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• 2020

본 연구의 목적은 우리나라 다문화청소년의 폭력 피해경험과 정신건강과의 관련성을 파악하여 다문화청소년의 정신건강증진 중재를 개발하는데 기초자료로 활용되기 위함이다. 본 연구는 2018년도 청소년건강행태조사결과를 기초자료로 한 이차자료 분석연구이며, 우리나라 다문화청소년 835명을 대상으로 하였다. 자료 분석은 IBM 25 ver. SPSS를 이용하였으며 복합표본을 이용하여 로지스틱 회귀분석을 실시하였다. 본 연구 결과 다문화청소년의 정신건강 특성에 공통적으로 영향을 미치는 요인은 폭력피해경험, 성별, 주관적 건강인지이며, 폭력피해 경험이 있고, 여학생이며 주관적 건강인지가 나쁠수록 슬픔, 절망감 경험, 자살사고, 자살계획, 자살시도가 높은 것으로 나타났다. 본 연구는 이차자료 분석연구로 폭력피해와 정신건강 인과관계를 파악하기 어려운 제한점이 있으나 전국적 규모의 청소년 조사자료를 이용하여 분석함으로써 연구결과의 대표성을 가지며, 다문화청소년을 대상으로 분석하였다는데 의의가 있다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.385-388
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• 2004

Many environmental destruction factors are accompanied in the mining development work and the secondary environmental disaster and the induction factors are inhered. We aquired digital data using aerial photogrammetry to analyze the terrain current situation according to the development situation of the mining restoration plan. We made the object area to 3D model and conducted terrian change monitoring. Then, we presented the decision-making information to improve rational management according to the original state plan.

• 대한지리학회지
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• 제44권3호
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• pp.395-409
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• 2009

이 논문에서는 퇴적물 입도분포지도 사례 연구를 통해 원격탐사 자료를 부가자료로 이용하는 경우 크리깅 기법이 원격탐사 자료와의 통합과 더불어, 원격탐사 자료의 영향을 분석할 수 있는 불확실성 모델링에 효율적으로 이용될 수 있음을 예시하고자 하였다. 안면도 동쪽 해안과 천수만 연안 지역에서 현장 조사 자료와 입도와 연관성이 높은 Landsat TM 자료의 반사도를 부가 자료로 이용하여 입도 분포도를 작성하였다. 사례 연구 결과, 조건부 분산의 분석을 통해, 샘플링 되지 않은 지역에서의 불확실성은 원격탐사 자료를 부가 자료로 이용함으로써 현저하게 줄어듦을 확인할 수 있었다. 이러한 크리깅 기반 불확실성 모델링 방법론은 입도 분포도 작성뿐만 아니라, 부가 자료의 이용이 가능한 다른 분야에서의 지표환경 주제도 작성에 유용하게 사용될 수 있을 것으로 기대된다.

• 대한기계학회논문집B
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• 제29권10호
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• pp.1092-1100
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• 2005

In the present study, characteristics of steady state laminar flows of a straight duct connected to a 180$^{o}$ curved duct were examined in the entrance region through experimental and numerical analyses. For the analysis, the governing equations of laminar flows in the Cartesian coordinate system were applied. Flow characteristics such as velocity profiles and secondary flows were investigated numerically and experimentally in a square cross-sectional straight duct by the PIV system and a CFD code(STAR CD). For the PIV measurement, smoke particles produced from mosquito coils. The experimental data were obtained at 9 points dividing the test sections by 400 3m. Experimental and numerical results can be summarized as follows. 1) Reynolds number, Re was increased, dimensionless velocity profiles at the outer wall were increased due to the effect of the centrifugal force and secondary flows. 2) The intensity of a secondary flow became stronger at the inner wall rather than the outer wall regardless of Reynolds number. Especially, fluid dynamic phenomenon called conner impact were observed at dimensionless axial position, x/D$_{h}$=50.

• Nuclear Engineering and Technology
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• 제23권3호
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• pp.275-284
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• 1991

핵연료봉의 정방형 또는 삼각형 배열내의 2차 난류 유동의 해석은 연료봉내의 온도분포와 열전달 과정의 해석에 있어서 중요한 문제이다. 비등방성 난류모델과 등방성 난류모델을 사용하여 속 도장을 구하였고 열수력학적 성질이 일정하다는 가정하에 지배방정식을 유한 요소법을 사용하여 수치해석적인 방법으로 해를 구하였다. 또한 연료봉 표면 근처에서는 유체의 유동이 난류가 아니기 때문에 축 방향 속도는 벽의 법칙에 의해서 계산하였다. 이러한 방법에 의해서 구해진 해는 실험 결과와 비교되었고 비교적 잘 일치하였다.