• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1139-1143
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• 2003

HILS(Hardware-In-the-Loop Simulation) is a scheme that incorporates hardware components of primary concern in the numerical simulation environment. Due to its advantages over actual vehicle test and pure simulation, HILS is being widely accepted in automotive industries as test benches for vehicle control units. Developed in this study is a HILS system for EHB(Electro-Hydraulic Brake) systems that include a high pressure generator and a valve control system that independently modulates the brake pressures at four wheels. An EHB control logic was tested in the HILS system. Test results under various driving conditions are presented and compared with the VDC logic.

• 한국기계가공학회지
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• 제19권3호
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• pp.86-91
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• 2020

An important factor of rough road modeling is analyzing the shear behavior properties of the rough road. These properties influence the drawbar pull of the tool when interacting with the soil used in agriculture. Furthermore, shear behavior properties are important because sinkage and shear stress are generated when wheels drive on rough roads. In this study, we performed a direct shear test to investigate the shear behavior properties of soils and compare with the direct shear simulation; shear force derived by the coupled analysis of discrete element method; and multi-body dynamics. Soil contact parameters were measured in a wheel and soil contact simulation followed by comparison of the simulated and experimentally measured shear force.

• 중환자간호학회지
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• 제1권1호
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• pp.59-71
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• 2008

Purpose: This study was to identify the effects of simulation-based training for advanced cardic life support on the competence of nurses in critical care settings. Methods: In this study, a nonequivalent control pretest-post test quasi-experimental design was used. Data were collected from May 1 to June 1, 2006 at one general hospital in W city. Among 40 nurses in critical care settings, twenty were assigned to the experimental group and twenty to the control group. Nurses in the experimental group received simulation-based training for advanced cardiac life support. Measurement tool were ACLS related knowledge and skills developed by AHA & Mega Code (2005) and some items were modified. The collected data were statistically processed using SPSS version 12.0 for Windows, and analyzed using descriptive statistics, $X^2$test, t-test, paired ttest, Pearson correlation coefficients. Results: 1) Hypothesis 1“: Nurses who received simulationbased training would have more knowledge of advanced cardiac life support than nurses who received traditional training”, was supported (t=11.51, p=.00). 2) Hypothesis 2: “Nurses who received simulation-based training would have better advanced cardiac life support skills than nurses who received traditional training”, was supported (t=2.38, p=.00). Conclusion: Simulation-based training for advanced cardiac life support is an effective strategy for increasing the competence of nurses in advanced cardiac life support in critical care settings.

• 한국학교보건학회지
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• 제24권1호
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• pp.33-40
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• 2011

Purpose: The purpose of the study was to determine the effects of Simulation-Based Training on anxiety, depression and self-efficacy in nursing students. Methods: A quasi-experimental research design (one group pre-test and post-test design) and a questionnaire for measuring anxiety, depression and self-efficacy were used in this study. The participants were 97 students of a nursing college. Data were collected before the program and immediately after the program. Means, SD, paired t-test, and Cronbach's ${\alpha}$ with the SPSS/WIN 12.0 program were used to analyze the data. Results: There was a statistically significant decrease in anxiety (p=.012) and a statistically significant increase in self-efficacy (p=.048), but not in depression (p=.439) among the nursing students who underwent Simulation-Based Training. Conclusion: From the findings of this study, it was demonstrated that Simulation-Based Training interventions had effects on anxiety and self-efficacy. Therefore, future and/or repeat studies will actively apply Simulation-Based Training interventions.

• Smart Structures and Systems
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• 제28권6호
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• pp.727-735
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• 2021

Recently, non-destructive health monitoring methods such as magnetic flux leakage (MFL) method, have become popular due to their advantages over destructive methods. Currently, numerical study on this field has been limited to simplified studies by only obtaining MFL instead of induced voltage inside coil sensor. In this study, it was proposed to perform a novel numerical simulation of MFL's coil sensor by considering vital parameters including specimen's motion with constant velocity and saturation status of specimen in time domain. A steel-rod specimen with two stepwise cross-sectional changes (i.e., 21% and 16%) was fabricated using low carbon steel. In order to evaluate the results of numerical simulation, an experimental test was also conducted using a magnetic probe, with same size specimen and test parameters, exclusively. According to comparative results of numerical simulation and experimental test, similar signal amplitude and signal pattern were observed. Thus, proposed numerical simulation method can be used as a reliable source to check efficiency of sensor probe when different size specimens with different defects should be inspected.

• 한국시뮬레이션학회논문지
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• 제19권3호
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• pp.17-25
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• 2010

선박 조종 시뮬레이션을 구성하는 기동 모델은 대상 선박의 동역학적인 특성을 현실에 가깝게 구현해야 하며, 신속한 계산 및 결과 처리가 가능하여야 한다. 다중 선박을 대상으로 하는 실시간 조종 시뮬레이션에서는 계산 시간 단축을 위해 일반적으로 선회각이나 선회율, 또는 전진 속도에 대한 1차 미분방정식 모델을 사용하여 선박의 움직임을 구현하게 된다. 본 논문에서는 대상 선박의 선회 시험 정보가 주어져 있을 경우 이를 이용한 선박의 단순 기동 모델링 및 계수 추정법을 제안하였다. 전진속도가 일정한 모델과 전진 속도의 변화를 고려한 모델의 계수 추정법을 수학적으로 전개하였으며, 실선 선회 시험 자료를 이용하여 제안된 모델의 유용성을 검증하였다.

• 통합자연과학논문집
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• 제15권1호
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• pp.9-18
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• 2022

This research examines the power of bootstrap two-sample test, and compares it with the powers of two-sample t-test and Wilcoxon rank sum test, through simulation. For simulation work, a positively skewed and heavy tailed distribution was selected as a population distribution, the chi-square distributions with three degrees of freedom, χ²₃. For two independent samples, the fist sample was selected from χ²₃. The second sample was selected independently from the same χ²₃ as the first sample, and calculated d+ax for each sampled value x, a randomly selected value from χ²₃. The d in d+ax has from 0 to 5 by 0.5 interval, and the a has from 1.0 to 1.5 by 0.1 interval. The powers of three methods were evaluated for the sample sizes 10,20,30,40,50. The null hypothesis was the two population medians being equal for Bootstrap two-sample test and Wilcoxon rank sum test, and the two population means being equal for the two-sample t-test. The powers were obtained using r program language; wilcox.test() in r base package for Wilcoxon rank sum test, t.test() in r base package for the two-sample t-test, boot.two.bca() in r wBoot pacakge for the bootstrap two-sample test. Simulation results show that the power of Wilcoxon rank sum test is the best for all 330 (n,a,d) combinations and the power of two-sample t-test comes next, and the power of bootstrap two-sample comes last. As the results, it can be recommended to use the classic inference methods if there are widely accepted and used methods, in terms of time, costs, sometimes power.

• 한국시뮬레이션학회논문지
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• 제27권1호
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• pp.111-117
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• 2018

영상탐색기가 적용된 유도무기체계의 경우 영상 추적 성능이 체계 성능에 큰 영향을 미치기 때문에 유도탄 비행 중 강인한 영상 추적 성능을 확보하는 것이 필수적이다. 유도탄의 실사격 비행시험이 실제 영상 추적 성능을 확인하기 위한 가장 확실한 방법이나, 실사격 시험만으로 영상 추적기법을 실험 및 수정/보완할 경우 매우 큰 비용 손실이 발생하게 된다. 따라서 영상탐색기를 유도탄 비행 궤적을 모의할 수 있는 비행체에 탑재 후 추적 성능을 시험하는 탑재비행시험(CFT; Captive Flight Test)을 수행하게 된다. 하지만 탐색기를 탑재하는 항공기가 유도탄의 완벽한 거동을 모의하는 것은 불가능하기 때문에 탑재 비행시험만으로 체계 성능을 확인할 수는 없다. 본 논문에서는 기존 영상추적기법 단독 성능 확인에만 한정되어 있던 탑재비행시험 영상을 통합비행 시뮬레이션에 적용하여 체계 성능 확인이 가능하도록 한 기법 연구 결과에 대하여 기술하였다. 이 연구는 탑재비행시험 영상의 활용도를 증대시킬 뿐만 아니라, 기존 합성영상 기반의 통합비행 시뮬레이션 기법의 사실성을 보완할 수 있어 다양한 측면에서 체계 성능 검증을 가능하게 하였다.

• 한국융합학회논문지
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• 제12권12호
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• pp.519-528
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• 2021

본 연구는 간호 대학생을 대상으로 시뮬레이션 기반 인수인계 교육프로그램을 적용하여 학생들의 인수인계 수행능력과 인수인계 자신감에 미치는 효과를 검증하고자 한다. K도 소재 P시와 A시 소재 간호 대학생 104명에게 사전·사후 실험설계의 비동등성 대조군 유사 실험연구를 수행하였다. 자료 수집 기간은 2017년 10월 30일부터 11월 10일까지이며, 수집된 자료 분석은 SPSS WIN 21.0 프로그램을 이용하여 x² test, Fisher's exact test, independent t-test, ANCOVA with pretest value as covariate를 실시하였다. 효과를 검증한 결과 인수인계 수행능력에서 유의한 차이가 있는 것으로 나타났다. 본 연구에서 개발된 시뮬레이션 기반 인수인계 교육 프로그램은 간호대학생의 인수인계 수행능력을 증진하는 데 효과적인 인수인계 교육 프로그램으로 적용될 수 있을 것이다.

• 한국항공운항학회지
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• 제26권2호
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• pp.76-82
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• 2018

A test simulator is needed to develop a fuel quantity measurement system that takes into account the roll and pitch motion of the aircraft. In this paper, we develop a test simulator that consists of attitude simulation equipment, fueling equipment, and data storage equipment. The attitude simulation equipment simulates the aircraft attitude. It is manufactured to operate pitch angle and roll angle movement. The fueling equipment supplies fuel to the supplementary fuel tank. The data storage equipment collects and stores the measured data. We also develop an automation software that operates the test simulator and collects data automatically. The test simulator has been automated to prevent testers from being exposed to toxic fuel. Through automation software, the collection period is reduced by one quarter compared to manual collection. The developed fuel quantity measurement system is verified through the test simulator.