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Montréal, Canada

Roy C.,Cole de Technology Superieure | Dziong Z.,Cole de Technology Superieure | Gregoire J.-C.,INRS - Institute National de la Recherche Scientifique
2011 IEEE GLOBECOM Workshops, GC Wkshps 2011

Wireless mesh networks (WMN) are efficient and low cost solutions for the deployment of broadband access in various environments. To support real-time applications such as multimedia and emergency services, WMNs must provide quality of service (QoS) guarantees and QoS continuity protection. While the capacity of single radio WMNs may severely limit the QoS for such traffic, multiradio WMNs can overcome this restriction and provide additional links to support better QoS mechanisms. This paper describes the design and implementation of a mechanism to switch channel in IEEE 802.11s multiradio WMNs. This semi-centralized mechanism decreases the delays required to switch channels and ensures a continuous connectivity between mesh points and mesh portal points. Intended for self-configuration and self-healing mechanisms, the performance of our new channel switch mechanism is evaluated in a simulated environment. We show that time performance results obtained to optimize topologies or to recover from failures are well below the time constraints of real-time applications. © 2011 IEEE. Source

Rinaldi G.,Department of National Defence | Stiharu I.,Concordia University at Montreal | Packirisamy M.,Concordia University at Montreal | Nerguizian V.,Cole de Technology Superieure | And 2 more authors.
Measurement Science and Technology

Utilizing in situ dynamic pressure measurement is a promising novel approach with applications for both control and condition monitoring of gas turbine-based propulsion systems. The dynamic pressure created by rotating components within the engine presents a unique opportunity for controlling the operation of the engine and for evaluating the condition of a specific component through interpretation of the dynamic pressure signal. Preliminary bench-top experiments are conducted with dc axial fans for measuring fan RPM, blade condition, surge and dynamic temperature variation. Also, a method, based on standing wave physics, is presented for measuring the dynamic temperature simultaneously with the dynamic pressure. These tests are implemented in order to demonstrate the versatility of dynamic pressure-based diagnostics for monitoring several different parameters, and two physical quantities, dynamic pressure and dynamic temperature, with a single sensor. In this work, the development of a dynamic pressure sensor based on micro-electro-mechanical system technology for in situ gas turbine engine condition monitoring is presented. The dynamic pressure sensor performance is evaluated on two different gas turbine engines, one having a fan and the other without. © 2010 IOP Publishing Ltd. Source

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