• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.180-181
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• 2013

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.24 no.3
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• pp.247-252
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• 2014

This paper presents a novel impact sensor which can be fabricated with smart paint made of grapheme. This smart nano paint can be easily installed on structures using a spray-on technique and that can make the sensor low cost and practical. The graphene effectively improves the piezoresistivity of the smart paint and that is available to achieve sensitive impact sensor with high gauge factor. The nano smart-paint can detect sufficient impact to cover the damaged energy range of the composite around 1~3J. The voltage outputs from the sprayed paints show fairly linear responses after signal processing. The impact makes deformation of the structure and it brings change of piezoresistivity of the paint and those converts into voltage output consequently by means of a simple signal processing system. The nano smart paint is lightweight and easily applied to the structural surface, and there is no stress concentration. The nano smart paint is expected to be a cost effective and sensitive multi-functional sensor for composites and other damage monitoring applications in the field of structural health monitoring.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.273-276
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• 2015

센서를 통한 제조업 생산 공정 데이터양의 폭발적 증가와 제조업의 서비스화 추세, 제조업의 미래산업과 빅데이터의 융합 추세를 고려해 보았을 때 앞으로 제조업에서 빅데이터의 영향은 점점 커질 것으로 예상된다. 따라서 한국의 제조업도 세계의 제조업 첨단화에 발맞추기 위해서 빅데이터의 활용을 장려하고 지원할 필요가 있다. 제조업의 실질적 효율성을 제공하는 효과의 임팩트가 가장 큰 기술 분야에서는 빅데이터 분석이 먼 미래에 도입을 고려할 분야가 아닌 현재의 최대 이슈이다. 제조업에서의 빠른 대응, 민첩성, 신뢰도 향상에서 기업들은 비용을 절감하고 자산의 효율적인 활용 측면에서도 단순한 제조공정에서 벗어나 많은 제조 기업들이 공장을 디지털화하고 스마트한 제조 공정 시스템 확보에 빅데이터를 구현, 활용해야 하는 단계이다. 빅데이터 활용은 현 시점에서 산업에 주는 영향으로 가장 파괴적인 기술이 될 것으로 예상된다.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.5
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• pp.785-796
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• 2023

In this study, a methodology for real-time classification and prediction of defects that may appear in PVDF(Polyvinylidene fluoride) sensors, which are widely used for structural integrity monitoring, is proposed. The types of sensor defects appearing according to the sensor attachment environment were classified, and an impact test using an impact hammer was performed to obtain an output signal according to the defect type. In order to cleary identify the difference between the output signal according to the defect types, the time domain statistical features were extracted and a data set was constructed. Among the machine learning based classification algorithms, the learning of the acquired data set and the result were analyzed to select the most suitable algorithm for detecting sensor defect types, and among them, it was confirmed that the highest optimization was performed to show SVM(Support Vector Machine). As a result, sensor defect types were classified with an accuracy of 92.5%, which was up to 13.95% higher than other classification algorithms. It is believed that the sensor defect prediction technique proposed in this study can be used as a base technology to secure the reliability of not only PVDF sensors but also various sensors for real time structural health monitoring.