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- Chedid, Michel, 1977-, et al.
(författare)
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Electromagnetic Coupling To a Wearable Application Based On Coaxial Cable Architecture
- 2006
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Ingår i: Progress In Electromagnetics Research, PIER. - 1070-4698. ; 56, s. 109-128
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Tidskriftsartikel (refereegranskat)abstract
- A radiated susceptibility problem has been identified and solved by means of simulations for a wearable computer system in the frequency range 30 MHz – 1 GHz. Simulation strategy is presented for analyzing the effects induced by an electromagnetic plane wave within the system comprising infra-red sensors connected by coaxial cables. A procedure of creating a TLM model of the coaxial cable with controlled electromagnetic coupling characteristics on a coarse grid is proposed. Results are verified by means of theoretical calculations. Different sensor enclosures and filtering circuits are analyzed and implemented to meet the hard electromagnetic compatibility requirements while not interfering with the functionality of the wearable application.
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- Chedid, Michel, 1977-, et al.
(författare)
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Evaluation of Conductive Textile for Wearable Computer Applications
- 2006
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Ingår i: The IMAPS Nordic Annual Conference. - 9519800298 ; , s. 220-227
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Konferensbidrag (refereegranskat)abstract
- Wearable systems put high demands on wearability and robustness. Conductive fabrics are very likely to be used in wearable systems due to their textile-like characteristics. However conductive fabrics must be able to resist environmental stresses (wearing, laundering, etc.) in the same way as clothing in order to fully comply with the requirements. A demonstrator, TxWear, was constructed to exploit conductive fabrics in building a conductive textile transmission line for intermodular communication and power transmission (DC power line communication bus), thus eliminating the need for cables between the modules. The hardware modules are connected to the conductive line through connectors from textile industry, i.e., snap fasteners. Different types of conductive fabrics (Ni/Cu plated polyester fabrics and stainless-steel based elastic ribbon) were evaluated and compared according to their conductivity, flexibility and robustness characteristics. The effect of washing on the electrical properties (per-unit-length parameters) of the textile transmission line was studied. Different coating processes, i.e., parylene and silicone coating, were studied and evaluated in order to isolate and enhance the robustness of the conductive textile. Ni/Cu plated polyester ripstop fabric was found to be not appropriate for wearable applications, while conductive elastic ribbon showed good robustness to laundry induced stresses.
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- Chedid, Michel, 1977-, et al.
(författare)
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Experimental Analysis and Modelling of Textile Transmission Line for Wearable Applications
- 2007
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Ingår i: International Journal of Clothing Science and Technology. - : Emerald Group Publishing Limited. - 0955-6222 .- 1758-5953. ; 19:1, s. 59-71
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Tidskriftsartikel (refereegranskat)abstract
- Purpose – By means of measurement and modelling, evaluate frequency dependent per-unit-length parameters of conductive textile transmission line (CTTL) for wearable applications and study deterioration of these parameters when CTTL is subjected to washing. Design/methodology/approach – The studied transmission line is made of Nickel/Copper (Ni/Cu) plated polyester ripstop fabric and is subjected to standard 60oC cycle in a commercial off-the-shelf washing machine. The per-unit-length parameters (resistance and inductance) and characteristic impedance of the line are extracted from measurements before and after washing. Using the measurement data an equivalent circuit is created to model the degradation of the line. The circuit is then integrated in a three-dimensional Transmission Line Matrix (TLM) model of the transmission line. Findings – Both an electrical equivalent circuit and a TLM model are developed describing the degradation of the conductive textile when washed. A severe deterioration of the electrical parameters of the line is noticed. Experimental and modelling results are in good agreement in the addressed frequency band. Research limitations/implications – Analysis is performed for frequencies up to 10 MHz. The developed TLM model can be used to conduct parametric studies of the CTTL. To counteract the degradation of the line, protective coating is to be considered in further studies. Originality/value – Experimental and simulation based characterization of the conductive textile transmission line when subjected to washing cycles.
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- Chedid, Michel, 1977-, et al.
(författare)
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Low Power High Bandwidth Power-Line Communication Network for Wearable Applications
- 2010
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A DC power-line communication (PLC) network for wearable applications is proposed and studied. The DC-PLC network enhances wearability compared to other types of wired networks by requiring minimum amount of wiring. The DC-PLC transceiver is designed based on a low power high bandwidth active inductance circuit, thus not jeopardizing the low power property of the wired solution. The DC-PLC network is implemented in a wearable application and compared to a wireless wearable network by studying and comparing the bit-energy of these networks. The bitenergy study is based on a statistical model of the communication where message size and rate, preamble time and power measurements are included. The DC-PLC network showed shorter latency and lower bit-energy compared to the wireless alternatives when preamble time is kept at reasonable level.
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- Chedid, Michel, 1977-, et al.
(författare)
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Modelling and Characterization of Electrostatic Current Noise Induced Mechanically in Wired Wearable Applications
- 2010
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Ingår i: Journal of Electrostatics. - : Elsevier BV. - 0304-3886 .- 1873-5738. ; 68:1, s. 21-26
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Tidskriftsartikel (refereegranskat)abstract
- By means of statistical modelling and measurement, the triboelectric current noise spectral density is evaluated for shielded cables in body-borne wired network subjected to mechanical stresses. Assuming a shot noise model, an expression for the current spectral density of the noise is derived. The efficiency of the methodology is demonstrated by measuring the triboelectric current noise in two shielded cables subjected to bending. Thereafter the parameters of the noise pulses’ waiting time and amplitude probability density functions are extracted from measurement, thus enabling the computation of the current spectral density of the noise induced mechanically in body-borne wired networks.
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