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Y.Q. Ni,B. Li,K.H. Lam,D.P. Zhu,Y. Wang,J.P. Lynch,K.H. Law 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.2
As a testbed for various structural health monitoring (SHM) technologies, a super-tall structure –the 610 m-tall Guangzhou Television and Sightseeing Tower (GTST) in southern China – is currently under construction. This study aims to explore state-of-the-art wireless sensing technologies for monitoring the ambient vibration of such a super-tall structure during construction. The very nature of wireless sensing frees the system from the need for extensive cabling and renders the system suitable for use on construction sites where conditions continuously change. On the other hand, unique technical hurdles exist when deploying wireless sensors in real-life structural monitoring applications. For example, the low-frequency and lowamplitude ambient vibration of the GTST poses significant challenges to sensor signal conditioning and digitization. Reliable wireless transmission over long distances is another technical challenge when utilized in such a super-tall structure. In this study, wireless sensing measurements are conducted at multiple heights of the GTST tower. Data transmission between a wireless sensing device installed at the upper levels of the tower and a base station located at the ground level (a distance that exceeds 443 m) is implemented. To verify the quality of the wireless measurements, the wireless data is compared with data collected by a conventional cable-based monitoring system. This preliminary study demonstrates that wireless sensing technologies have the capability of monitoring the low-amplitude and low-frequency ambient vibration of a super-tall and slender structure like the GTST.
Ni, Y.Q.,Li, B.,Lam, K.H.,Zhu, D.P.,Wang, Y.,Lynch, J.P.,Law, K.H. Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.7 No.2
As a testbed for various structural health monitoring (SHM) technologies, a super-tall structure - the 610 m-tall Guangzhou Television and Sightseeing Tower (GTST) in southern China - is currently under construction. This study aims to explore state-of-the-art wireless sensing technologies for monitoring the ambient vibration of such a super-tall structure during construction. The very nature of wireless sensing frees the system from the need for extensive cabling and renders the system suitable for use on construction sites where conditions continuously change. On the other hand, unique technical hurdles exist when deploying wireless sensors in real-life structural monitoring applications. For example, the low-frequency and low-amplitude ambient vibration of the GTST poses significant challenges to sensor signal conditioning and digitization. Reliable wireless transmission over long distances is another technical challenge when utilized in such a super-tall structure. In this study, wireless sensing measurements are conducted at multiple heights of the GTST tower. Data transmission between a wireless sensing device installed at the upper levels of the tower and a base station located at the ground level (a distance that exceeds 443 m) is implemented. To verify the quality of the wireless measurements, the wireless data is compared with data collected by a conventional cable-based monitoring system. This preliminary study demonstrates that wireless sensing technologies have the capability of monitoring the low-amplitude and low-frequency ambient vibration of a super-tall and slender structure like the GTST.
Mortar formulation for a class of staggered discontinuous Galerkin methods
Kim, H.H.,Chung, E.T.,Lam, C.Y. Pergamon Press ; Elsevier Science Ltd 2016 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.71 No.8
<P>A mortar formulation is developed and analyzed for a class of staggered discontinuous Galerkin (SDG) methods applied to second order elliptic problems in two dimensions. The computational domain consists of nonoverlapping subdomains and a triangulation is provided for each subdomain, which need not conform across subdomain interfaces. This feature allows a more flexible design of discrete models for problems with complicated geometries, shocks, or singular points. A mortar matching condition is enforced on the solutions across the subdomain interfaces by introducing a Lagrange multiplier space. Moreover, optimal convergence rates in both L-2 and discrete energy norms are proved. Numerical results are presented to show the performance of the method. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Choi, D.,Moon, J. H.,Kim, H.,Sung, B. J.,Kim, M. W.,Tae, G. Y.,Satija, S. K.,Akgun, B.,Yu, C.-J.,Lee, H. W.,Lee, D. R.,Henderson, J. M.,Kwong, J. W.,Lam, K. L.,Lee, K. Y. C.,Shin, K. The Royal Society of Chemistry 2012 Soft matter Vol.8 No.32
<P>X-Ray and neutron reflectivity measurements on systems composed of a 1,2-dipalmitoyl-<I>sn</I>-glycero-3-phosphocholine (DPPC) bilayer and transcription-activating-factor derived peptides (TDPs) have allowed us to determine the mechanism of membrane translocation. By monitoring the structural changes of the bilayers caused by the binding of TDPs while systemically varying temperature and TDP concentration, our results revealed the detailed molecular structures of the stepwise interactions that occurred during the translocation of TDP across the lipid bilayers. While little indication of membrane perturbation was observed at low TDP concentrations, we found that the TDP movement across the membrane induced defect formations in the membrane at higher TDP concentrations.</P> <P>Graphic Abstract</P><P>X-Ray and neutron reflectivity have allowed us to reveal the detailed molecular structures of cell penetrating peptides across the supported lipid bilayers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm25913c'> </P>
Lam, V D,Tung, N T,Cho, M H,Park, J W,Jang, W H,Lee, Y P Institute of Physics [etc.] 2009 Journal of physics. D, applied physics Vol.42 No.11
<P>This report investigates the effect of the dielectric layer thickness on both magnetic and electric resonances of cut-wire-pair (CWP) structures in the microwave frequency regime. It was found that the resonances are sensitive to the thickness of the dielectric layer. As the thickness increases, the bandwidth of the magnetic resonance is slightly extended to a higher frequency, while the low-frequency edge of the electric-resonance band is remarkably shifted to a lower frequency. It was also found that the dependence of the magnetic resonance frequency on the dielectric layer thickness follows the trend of the closed formula based on the cavity model for the coupled metallic elements (Cai <I>et al</I> 2007 <I>Opt. Express</I> <B>15</B> 3333). In addition, we also studied the effect of the dielectric layer thickness on the left-handed behaviour of a combined structure consisting of CWP and continuous wire. The actual measurements are compared with the numerical simulation values to show a good coincidence.</P>