• 지역사회간호학회지
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• 제25권3호
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• pp.187-197
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• 2014

Purpose: The aim of this study was to identify the roles, duties and tasks of elementary health teachers. Required knowledge, skills, and worker behaviors were also examined. Methods: Elementary health teachers' jobs were analyzed by DACUM workshop. First, the health teachers' roles and related jobs were described, and then the jobs were divided into duties and subordinate tasks. The identified roles, duties and tasks were reviewed and refined, and then were organized in a DACUM chart. DACUM committee members discussed not only general knowledge, skills and work behaviors but also future trends and concerns. Results: The DACUM chart for elementary health teachers consisted of 8 duties and 52 tasks. Required knowledge, skills and worker behaviors were also listed. Conclusion: Elementary health teachers play roles as health manager, health care provider, and teacher in school. Their roles, duties and tasks are being changed. Thus, their jobs need to be redefined legally, politically, and institutionally.

• 대한기계학회논문집
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• 제18권2호
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• pp.502-511
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• 1994

A video deck mechanism is composed of various cams, links, and gears, and it requires precise movement. So kinematic motion between parts should be considered to get desired movement depending on the timing chart which defines movement of each part to get desired mode. Also dynamic effects should be considered to get right tape tension and to estimate motor force required to obtain accurate motion. The design process of the deck mechanism of VCR is explained briefly. The loading block of the deck mechanism is divided into a tape translational group and a brake control group. Each group is modeled for kinematic and dynamic analysis. Finally, two groups are combined together to analyze the loading block of the deck mechanism. Results are used to understand and modify an existing design.

• 한국항공운항학회지
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• 제14권4호
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• pp.94-100
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• 2006

The purpose of this case study is to determine the possibility of Numerical Forecasting of sea fog at West Sea in spring time. For practical method of analyzing the data collected from 24th to 26th March 2003, Numerical Weather Prediction model MM5(Mesoscale Model Version 5) and synoptic field study using synoptic chart, upper level chart, and sea surface temperature were employed. The results of synoptic field analysis summarized that sea fog at West sea in spring is intensified by the inflow of the warm flow from west or southwest, low sea surface temperature to increase the temperature difference between air and sea surface, and inversion layer to disturb the disperse. It appears that the possibility of sea fog forecasting by MM5, in view of the result that the MM5 output is similar to the synoptic fields analysis.

• International Journal of Reliability and Applications
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• 제9권1호
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• pp.17-30
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• 2008

Analysis of measurement systems is important to determine if the measurement process is adequate to measure the part-to-part variability in the process. Control chart techniques provide an effective, and easy-to-use method for performing this analysis. However, application with the real data for the evaluation procedure for multiple measurement systems have not been demonstrated. This research will provide a methodology for the evaluation of part-to-part variation and variation of different measurement systems step by step followed by number of case studies for each methodologies provided.

• 대한안전경영과학회지
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• 제10권1호
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• pp.191-195
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• 2008

The present study contributes reviewing and suggesting various models for measurement system analysis (MSA). Measurement errors consist of accuracy, linearity, stability, part precision, repeatability and reproducibility (R&R). First, the major content presents split-plot design, and the combination method of crossed and nested design for obtaining gage R&R. Second, we propose $\bar{x}-s$ variable control chart for calculating the gage R&R and number of distinct category. Lastly, investigating the determination of gage performance curve which establishes the control specification propagating calibration uncertainties and measurement errors is described.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.863-874
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• 2009

The engineering characteristics and the reinforcement effect of the elephant foot method were discussed with parametric study. The elephant foot method is adopted to support the loads transferred from tunnel crown and improve bearing capacity of elephant foot in poor ground condition. The evaluation of reinforcement effect, which has the mechanical relationship between ground condition, footing size and reinforcement system, was carried out through the previous research and numerical analysis. In addition, the simple design chart was proposed to estimate the applicability of the elephant foot reinforcement method. It will be practical for the engineer to determine the optimum reinforcement method for safe tunnelling in soft ground condition.

• 한국전산구조공학회논문집
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• 제35권5호
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• pp.317-324
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• 2022

본 논문에서는 등가 단자유도를 이용하여 구조부재의 정적변위를 고려하는 해석기법을 제시하였다. 기존의 단자유도 비선형 동적 해석 알고리듬을 구조부재의 초기정적변위의 영향을 고려할 수 있도록 개선하였다. 가정된 폭발하중 지속시간과 부재의 고유주기 비에 따라 정적변위가 최대응답에 미치는 영향의 차이와 폭발하중의 방향과 초기변위의 방향에 따른 차이를 확인하였다. 이에 따라 기존의 응답 차트를 정적변위를 고려할 수 있도록 폭발하중의 형태에 따라 각각 제시하였다. 설계 예제를 정적변위가 고려된 응답 차트에 적용하여 부재의 최대 변위를 비교 및 분석하였다. 본 연구의 결과를 통해 초기 정적변위를 고려한 구조부재의 최대응답을 쉽게 산정할 수 있으며 본 연구에서 제시한 응답 차트는 플랜트 또는 군사시설물의 내폭 설계에 활용될 수 있다.

• 한국항공우주학회지
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• 제50권4호
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• pp.241-250
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• 2022

본 논문은 제어 모멘트 자이로를 장착한 위성의 효율적인 기동성능 분석을 위한 지표로 활용되고 있는 유효 각운동량 차트(FAM Chart)를 설계 및 분석한다. 최근 인공위성의 고기동성에 대한 요구가 증가함에 따라 위성에게 주어진 임무를 보다 효과적으로 수행하기 위하여 고 토크 발생기인 제어 모멘트 자이로(CMGs)에 대한 관심이 상승하고 있는 추세이다. 다만 CMG는 특정 방향으로 제어 토크가 발생하지 않는 특이점 문제가 존재하므로 이를 개선하기 위하여 본 논문은 지붕형 배치를 따르는 두 쌍의 제어 모멘트 자이로(TPCMGs)를 장착한 위성 시스템에 대하여 고려하였으며, 특이점 발생 가능 공간 및 구동기 제한으로 인한 토크 오류 발생 공간을 제외한 김벌 공간을 새롭게 정의하여 이에 따른 유효 각운동량 공간을 FAM 차트라 칭함으로써, 해당 공간 내의 위성 3축 파라미터들을 수학적으로 도출해낼 수 있으므로 효과적인 위성 기동성능 분석이 가능함에 의의가 있다.

• Journal of the Korean Data and Information Science Society
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• 제16권3호
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• pp.507-514
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• 2005

In this paper we consider an operating methodology of SPC(statistical process control) system in the TFT-LCD industries. The main contents are real time process monitoring, significant difference test, outlying glass analysis, process capability analysis and chart viewing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.22-24
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• 2006

The installations of power quality monitoring system have increased drastically over the past several decades. These systems have been effectively used to monitor, analyze and diagnose the conditions of power system, and furthermore can be used to improve the present asset maintenance policy, scheduled (time-based) method, into the advanced, cost-effective and labor-effective maintenance methods, such as condition-based maintenance, predictive maintenance and reliability centered maintenance. As an approach to this, this paper introduces the statistical methods, three kinds of control charts (Shewhart chart, CUSUM chart and EWMA chart), and discusses the applicability of these methods to recognize the changing trends of power quality indices and to estimate the system's condition, using Matlab.