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- Johansson, Alf, 1947-, et al.
(författare)
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An ANT based wireless body sensor biofeedback network for medical E-health care
- 2011
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Ingår i: 7th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2011. - Wuhan : IEEE conference proceedings. - 9781424462520 ; , s. Art. no. 6040656-
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Konferensbidrag (refereegranskat)abstract
- This paper presents an ultra low power wireless insole sensor biofeedback and gait analysis system for rehabilitation of balance control for post stroke patients and gait related rehabilitation. The system integrates ANT wireless protocol, a wireless home E-health care sensor network and open-source mobile device technology. The paper also presents methods to time synchronize the two sole sensors. The system has been evaluated and it shows good performance in power consumption, communication latency, coexistence with WiFi/BlueTooth/GSM. © 2011 IEEE.
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| 2. |
- Nazir, Mian Hammad, 1985-, et al.
(författare)
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Optimal Dynamic Frame-Slotted Aloha : (ODFSA)
- 2011
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Ingår i: Optimal Dynamic Frame Slotted Aloha, Proceedings of the 7th International Conference on Wireless Communications Networking and Mobile Computing, Wuhan China, Sep 23, 2011 - Sep 25, 2011. - IEEE : IEEE. ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- Passive UHF RFID systems using Dynamic Frame-Slotted ALOHA (DFSA) adjust the frame size according to the number of tags, but frame size N is equals to 2^Q and cannot be adjusted exactly to the number of tags to be identified. In this paper, we propose an optimal Aloha algorithm (ODFSA), which uses probabilistic approach for tags to access the frame. The Query or Query Adjust packet contains both the parameter Q and P called frame access probability, which represents the ratio of number of active tags in the current frame to the estimated total number of tags which remain to be identified in the system. Estimation of number of unread tags is updated after end of each frame; parameters Q and P are calculated and informed at the beginning of each frame. Mathematical analysis and computer simulations show that the proposed Aloha achieves maximum system efficiency, utilizes less number of slots compared with other algorithms and also takes less identification time.
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| 3. |
- Shen, Wei, et al.
(författare)
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Smart Border Routers for eHealthCare Wireless Sensor Networks
- 2011
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Ingår i: The 7th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). - : IEEE conference proceedings. - 9781424462520 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- With advances in low-power and low-cost wireless and sensor technologies, using WSNs in eHealthCare system has yielded tremendous efforts in recent years. However, most of previous researches adopt a remote server to process large scale of health sensor data forwarded by gateways that allow for interconnecting WSNs to IP network. In this paper, we present a prototype of a smart 6LoWPAN border router aimed to locally make decisions of health states using a Hidden Markov Model and enable wireless E-health care sensor network to seamlessly connect with IP network.
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| 4. |
- Chedid, Michel, 1977-, et al.
(författare)
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Realization of an active inductance for a low power high bandwidth DC power line communication network transceiver
- 2010
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Ingår i: AEU - International Journal of Electronics and Communications. - : Elsevier. - 1434-8411 .- 1618-0399. ; 64:10, s. 947-952
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Tidskriftsartikel (refereegranskat)abstract
- An active inductor based on an improved gyrator circuit is proposed. The active inductor is developed to be implemented in a high impedance transceiver for a wearable DC power line communication network where requirements such as low power consumption, high bandwidth and numerous nodes support are prioritized. A load isolation step is introduced to ensure the stability of the active inductance's size on different load currents. The proposed gyrator circuit is analyzed and optimized by means of theoretical calculations. The theoretical results are then verified by simulations and experiments in the frequency range up to 10MHz.
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| 8. |
- Lindgren, Mats, et al.
(författare)
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Multi-disciplinary Approach to Design of a Power Electronics Module for Harsh Environments
- 2009
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Ingår i: Thermal, Mechanical and Multi-Physics simulation and Experiments in Microelectronics and Microsystems, 2009. - 9781424441600 ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- A set of experimental and computer simulation methods has been applied to reliability analysis of a newly designed resin transfer molded power electronics module for automotive applications, comprising the glass-fiber epoxy multi-layer PCB, populated with various electronic packages. Evaluation of thermo-mechanical stability, determination of moisture ingress, and testing the adhesion quality between the molding compound and the module PCB have been performed along with investigation of heat transfer paths in the module. The experiments in harsh environments have revealed thermo-mechanical stability and acceptable moisture ingress for the module test samples with relatively large BGA components on the glass-fiber epoxy PCBs of different thickness and different solder mask types. Thermal images of the module have been obtained and the CFD model was created and validated with temperature measurements in power-on tests. Extreme heat dissipation modes have been studied by modeling.
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