| 1. |
- de Freitas, Edison Pignaton, 1979-, et al.
(författare)
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Evaluation of coordination strategies for heterogeneous sensor networks aiming at surveillance applications
- 2009
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Ingår i: Sensors 2009 New Zealand. - Piscataway, N.J. : IEEE Press. - 9781424445486 - 9781424453351 ; , s. 591-596
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Konferensbidrag (refereegranskat)abstract
- A new challenge in the sensor network area is the coordination of heterogeneous sensors (with different sensing, mobility and computing capabilities) in an integrated network. This kind of sensor networks have clearly high relevance in surveillance systems, in which both low-end static ground sensor nodes and more sophisticated sensors carried by mobile platforms, such as Unmanned Aerial Vehicles (UAVs), cooperate. This paper provides an analysis of two different strategies to guide the collaboration among the sensor nodes mentioned above, applied to area surveillance systems. The first analyzed problem is related to the choice of the UAV instance that will respond to a given alarm issued by a ground sensor node. The second issue is the estimation of the response time until any UAV can be engaged in handling an alarm and effectively handles it. Two strategies are introduced and compared: one based on a pheromone inspired approach and another based on utility functions inspired on risk profiles that models decisions of investors in the stock market. ©2009 IEEE.
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| 2. |
- Feng, Yi, et al.
(författare)
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Development and experimental verification of analytical models for printable interdigital capacitor sensors on paperboard
- 2009
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Ingår i: 2009 IEEE Sensors. - : IEEE Sensors Council. - 9781424445486 ; , s. 1034-1039
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Konferensbidrag (refereegranskat)abstract
- Printed interdigital capacitor DWI on paperboard is a promising solution for low-cost sensors in intelligent packaging applications. The currently available analytical models of multi-layered IDCs are targeted to those fabricated by conventional semiconductor process. For this reason, we have adapted two promising models and assessed their accuracies by comparison with experimental data. We modified these models by treating the paper as non-infinite thick substrate and taking the effect of printed metal thickness into account. The models are studied further to reveal the relationship between the response of capacitance change and various geometric parameters which enables a quick way of obtaining the optimum IDC structure design. The modified Gevorgian model fits our experimental data best, and the sensitivity of IDCs is largely affected by its spatial wavelength and the thickness of sensing material layer, while the finger number, length and metallization ratio have minor impact.
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| 3. |
- Pang, Zhibo, et al.
(författare)
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Mobile and Wide Area Deployable Sensor System for Networked Services
- 2009
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Ingår i: 2009 IEEE SENSORS. - NEW YORK : IEEE. - 9781424445486 ; , s. 1329-1332
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Konferensbidrag (refereegranskat)abstract
- A mobile and wide area deployable wireless sensor system, including hardware and software, is developed to enhance the mobility, deployment and capability of wireless sensors for networked services. Due to the dual-layer dual-directional wireless communication capability of a novel WAN-SAN coherent architecture and the removal of fix-installed gateway, all sensor nodes are remotely controllable and seamlessly integrated to internet services. Hardware modules are optimized for ultra low power and compact size. Abstract and extendable application interface is developed, based on SMS and TCP/UDP protocol, to be integrated easily into existing service systems. Hierarchical CPS-LPS Adaptive Localization, is supported based on CPS, wireless cellular ID, RFID, IR-UWB and inertial prediction. Specific data compression technique is adopted for high density data source. Finally, Fresh Food Tracking service is presented as an application example, including some field test data.
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| 4. |
- Pearce, Ruth, et al.
(författare)
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Effect of Water vapour on Gallium doped Zinc Oxide nanoparticle sensor gas response
- 2009
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Ingår i: IEEE Sensors, 2009. - Piscataway, NJ, United States : IEEE. - 9781424445486 - 9781424453351 ; , s. 2039-2043
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Konferensbidrag (refereegranskat)abstract
- Zinc oxide is a wide band gap (similar to 3.4ev) semiconductor material, making it a promising material for high temperature applications, such as exhaust and flue environments where NO and NO2 monitoring is increasingly required due to stricter emission controls[1]. In these environments water vapour and background levels of oxygen are present and, as such, the effect of humidity on the sensing characteristics of these materials requires further study. The reaction mechanisms in the presence of water vapour are poorly understood and there is a need for deeper understanding of the principles and mechanisms of gas response of these materials. An investigation of the influence of changing water vapour (H2O) and oxygen (O-2) backgrounds on the response of nanoparticulate Ga-doped ZnO resistive sensors is presented.
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| 5. |
- Reggente, Matteo, et al.
(författare)
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Using local wind information for gas distribution mapping in outdoor environments with a mobile robot
- 2009
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Ingår i: IEEE sensors, vols 1-3. - New York : IEEE conference proceedings. - 9781424445486 ; , s. 1637-1642
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Konferensbidrag (refereegranskat)abstract
- In this paper we introduce a statistical method tobuild two-dimensional gas distribution maps (Kernel DM+V/Walgorithm). In addition to gas sensor measurements, the proposedmethod also takes into account wind information by modelingthe information content of the gas sensor measurements as abivariate Gaussian kernel whose shape depends on the measuredwind vector. We evaluate the method based on real measurementsin an outdoor environment obtained with a mobile robot thatwas equipped with gas sensors and an ultrasonic anemometerfor wind measurements. As a measure of the model quality wecompute how well unseen measurements are predicted in termsof the data likelihood. The initial results are encouraging andshow a clear improvement of the proposed method compared tothe case where wind is not considered.
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