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VLC-BASED MEDICAL HEALTHCARE INFORMATION SYSTEM
Ng, Xiao-Wei,Chung, Wan-Young National Taiwan University 2012 Biomedical engineering Vol.24 No.2
<P> Nowadays, wireless communication technologies are employed in medical body area networks to enhance flexibility and convenience for caregivers and patients. However, there is always the risk of disturbance from electromagnetic waves toward precision medical equipment. This study demonstrates a novel design and implementation of a medical healthcare information system using the emerging wireless visible light communication (VLC) technology. VLC technology can be implemented using visible light emitting diodes (LED), which is expected to be the main lighting source in the near future due to its energy efficient characteristic compared to conventional incandescent and fluorescent lighting. By manipulating the fast switching characteristic of LEDs, these lighting devices can be used simultaneously for illumination and wireless data communication. The prototype design of the VLC-based medical healthcare system can be used to provide data service and monitoring in radio frequency restricted hospital areas. High brightness LED (HB-LED) is used in the transmitter module to transmit medical and healthcare information using optical modulation method. High speed photodetector is used to detect the optical signal, then the signal is demodulated and conditioned at the receiver module. Medical caregivers or patients can download the biomedical data and healthcare information using a portable device with attached optical sensor. </P>
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Hazardless Biomedical Sensing Data Transmission Using VLC
Yew-Kiat Cheong,Xiao-Wei Ng,Wan-Young Chung IEEE 2013 IEEE SENSORS JOURNAL Vol.13 No.9
<P>The implementation of radio-frequency communication technologies in biomedical or healthcare applications involves multiple issues such as interference with precision medical instruments and human health hazard because of electromagnetic waves. A novel visible light communication technology for transmitting and monitoring biomedical data is presented. White beam light emitting diodes are used as optical information emitters for efficiently transmitting biomedical data such as patient information text and wavelike body sensor signals. ON/OFF keying modulation is used to modulate the data onto the visible light beam, and a high-speed p-i-n photo-detector is employed at the receiver. Experimental analysis of the data collected using this system demonstrates the effectiveness of the proposed method.</P>
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Mechanical response of rockfills in a simulated true triaxial test: A combined FDEM study
Ma, Gang,Chang, Xiao-Lin,Zhou, Wei,Ng, Tang-Tat Techno-Press 2014 Geomechanics & engineering Vol.7 No.3
The study of the mechanical behavior of rockfill materials under three-dimensional loading conditions is a current research focus area. This paper presents a microscale numerical study of rockfill deformation and strength characteristics using the Combined Finite-Discrete Element Method (FDEM). Two features unique to this study are the consideration of irregular particle shapes and particle crushability. A polydisperse assembly of irregular polyhedra was prepared to reproduce the mechanical behavior of rockfill materials subjected to axial compression at a constant mean stress for a range of intermediate principal stress ratios in the interval [0, 1]. The simulation results, including the stress-strain characteristics, relationship between principal strains, and principal deviator strains are discussed. The stress-dilatancy behavior is described using a linear dilatancy equation with its material constants varying with the intermediate principal stress ratio. The failure surface in the principal stress space and its traces in the deviatoric and meridian plane are also presented. The modified Lade-Duncan criterion most closely describes the stress points at failure.
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