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김광로,이영신,Kim, Kwang-Ro,Lee, Young Shin 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
The mirror which is considered in designing a MFD is off-axis primary one and its dimension is wide 556mm height 345mm. The MFD(Mirror Fixation Device) load specification is generated for the high resolution mirror. The optical WFEs for unit loads are calculated from mirror sensitivity analysis and they are compared with allocated allowable optical WFE. The parasite load for the MFD is calculated from their comparison. The MFD compliant with the parasite load is designed.
김광로,강휘원,설창원 항공우주시스템공학회 2018 항공우주시스템공학회지 Vol.12 No.3
The Monte Carlo simulation (MCS) method and the Guide to the Expression of Uncertainty in Measurement (GUM) are the most widely used approaches for uncertainty estimation. In this paper, MCS and GUM were used to estimate the confidence of MOI measurement equipment developed in-house. According to the results, the GUM estimated uncertainty was slightly underestimated compared to the MCS method. This difference is due to the approximation used by GUM. MOI uncertainties estimated by both methods were less than 1% of the estimate, which shows the high measurement reliability of the developed MOI measurement system. 몬테카를로 시뮬레이션 방법과 측정불확도 표현 지침은 불확도 평가를 위해 가장 널리 사용되는 방법들이다. 본 논문에서는 자체 개발된 질량관성모멘트 측정장비의 신뢰도를 평가하기 위해 몬테카를로방법과 GUM방법이 사용되었다. 결과에 따르면 GUM방법에 의해 평가된 불확도가 몬테카를로 방법에의한 것보다 약간 과소평가되었고 그 차이는 GUM방법의 근사화에 기인한 것으로, 두 방법에 의해 평가된 관성모멘트 불확도들은 추정량의 1% 미만으로 개발된 관성모멘트 측정시스템의 높은 측정신뢰성을 보여준다.
김광로,이영신,Kim, Kwang-Ro,Lee, Young-Shin 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
In this paper, using the mass/CG measurement equipment and the MOI measurement equipment developed in-house, Pitch MOI and Roll MOI of test specimen were measured and measurement uncertainties on MOI were studied. The possible factors of the measurement uncertainty that could affect accuracy of MOI measurement were mass, spring, frequency, and length measurement-related elements. The each combined standard uncertainty of pitch MOI and roll MOI was estimated from the uncertainties of the above various factors.
김광로,이영신 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
To deal with the difficulties of current acoustic emission (AE) source location methods, such as classical approaches based on times ofarrival and artificial neural networks based on AE signal features, the least squares support vector machines (LS-SVM) approach wasattempted in acoustic emission (AE) source location of plate-like structures. The AE events were produced by pencil lead breaks, and theresponse wave was received by piezoelectric sensors. The time of arrival, determined through the conventional threshold-crossing technique,was used to prepare delta t feature for the input to LS-SVM. Training and testing data sets were generated for the case of platesmonitored by four transducers and were adopted to validate the source location methodology using LS-SVM with delta t feature. Experimentaltests were carried out, with the source positioned at predetermined points evenly distributed within the plate area. A satisfactorycorrelation was found between the actual source locations and those predicted by the trained LS-SVM model. The results of the experimentsshow that the LS-SVM-based location method, with delta t feature, permits an alternative effective positioning in plate-like structures.