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컴퓨터모델의 확률적 보정 및 탄소성 압착문제의 신뢰도분석 응용
유민영(Min Young Yoo),최주호(Joo Ho Choi) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.9
컴퓨터 해석모델은 물리현상을 바탕으로 단순화된 모델을 구축하고 해를 구하는 유용한 도구이나, 많은 경우 단순화 가정 또는 입력변수 정보의 미비나 불확실성으로 인해 실제와 차이가 발생한다. 본 연구에서는 이러한 문제에 대해 베이지안 확률이론을 이용하여 실측데이터를 통해 해석모델을 보정하는 방법을 소개하고 이를 파이로 작동기구의 탄소성 압착 문제에 적용한다. 파이로 작동기구는 고에너지의 재료를 원격으로 폭발시켜 작동하는 장치로 그 작동의 신속한 계산을 위해서 단순한 수학모델을 구축하고 실험데이터를 토대로 미지의 입력변수를 확률적으로 보정하였다. 이 때, 확률적 추정을 위해서는 현대적 계산통계기법의 하나인 Markov Chain Monte Carlo 기법을 이용하였으며, 최종적으로 그 결과를 압착거동해석에 활용하여 작동기구의 신뢰도를 평가하였다. A computer model is a useful tool that provides solution via physical modeling instead of expensive testing. In reality, however, it often does not agree with the experimental data owing to simplifying assumption and unknown or uncertain input parameters. In this study, a Bayesian approach is proposed to calibrate the computer model in a probabilistic manner using the measured data. The elasto-plastic analysis of a pyrotechnically actuated device (PAD) is employed to demonstrate this approach, which is a component that delivers high power in remote environments by the combustion of a self-contained energy source. A simple mathematical model that quickly evaluates the performance is developed. Unknown input parameters are calibrated conditional on the experimental data using the Markov Chain Monte Carlo algorithm, which is a modern computational statistics method. Finally, the results are applied to determine the reliability of the PAD.
유민영(Yoo, Min Young),김해은(Kim, Hae Eun),김승인(Kim, Seoung In) 한국디지털디자인협의회 2014 (사)한국디지털디자인협의회 conference Vol.2014 No.5
Due to the development of technology of using the information and knowledge service, the role of public service became important. And as the tourists increased due to the growth of tourism industry, the necessity of tourism information delivery matching its demand emerged. What appeared in this background is kiosk, the road digital technology. This study analyzed the problem of currently installed kiosk by comparing and analyzing the two representative places having the different regional natures. Among them, kiosk in Gangnam station which had most floating populations and convenient traffic in Seoul and one in Insadong which had Korean inherent traditional culture were compared and analyzed. As a result of study, it took many unnecessary times to find the information of target area because currently installed kiosk was poorly managed and contained a wide range of tourism information, and it did not consider the regional nature and user’s usability. Tourism kiosk should arrange the information matching the regional nature and recognize quickly and understand, and understand easily in obtaining the information using the infography or pictogram and be able to gain the interest. Kiosk should be designed to play a role of public service which reflects the nature of relevant region in accordance with original object rather than delivering all information. Therefore, kiosk users are going to be surveyed by questionnaire based on the honeycomb model of reorganized Peter Moville in the secondary paper based on this study result.