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C.W. Kim,M. Kawatani,R. Ozaki,N. Makihata 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.4
This paper presents recovering of missing vibration data of a bridge transmitted from wireless sensors. Kalman filter algorithm is adopted to reconstruct the missing data analytically. Validity of the analytical approach is examined through a field experiment of a bridge. Observations demonstrate that, even a part of recovered acceleration responses is underestimated in comparison with those responses taken from cabled sensors, dominant frequencies taken from the reconstructed data are comparable with those from cabled sensors.
Kim, C.W.,Kawatani, M.,Ozaki, R.,Makihata, N. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.4
This paper presents recovering of missing vibration data of a bridge transmitted from wireless sensors. Kalman filter algorithm is adopted to reconstruct the missing data analytically. Validity of the analytical approach is examined through a field experiment of a bridge. Observations demonstrate that, even a part of recovered acceleration responses is underestimated in comparison with those responses taken from cabled sensors, dominant frequencies taken from the reconstructed data are comparable with those from cabled sensors.
Structural evolution of graphene in air at the electrical breakdown limit
Son, J.,Choi, M.,Choi, H.,Kim, S.J.,Kim, S.,Lee, K.R.,Vantasin, S.,Tanabe, I.,Cha, J.,Ozaki, Y.,Hong, B.H.,Yang, I.S.,Hong, J. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.99 No.-
<P>In application of graphene to real electronics, understanding the mechanism of the electrical breakdown of the graphene in harsh environments should precede many activities in tamed conditions. In this article, we report the unusual structural evolution of microbridge graphene in air near the electrical current-breakdown limit. In-situ micro-Raman study revealed that Joule heating near the electrical breakdown gave rise to a substantial structural evolution: a previously unknown broad amorphous-like and partially reversible phase at an on-and off-current of similar to 3.0 X 10(8) A/cm(2), which finally drove the phase to the electrical current-breakdown. Our calculations suggest that the phase originates from the broken symmetry caused by defect formations during Joule heating. In particular, these formations are bonds of carbon-oxygen and vacancies-oxygen. A collection of energetically favorable vacancies-oxygen pairs results in porous graphene, and its evolution can be the key to understanding how the breakdown starts and propagates in graphene under high current density in air. (C) 2015 Elsevier Ltd. All rights reserved.</P>