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Review by Nate Ota CS294 8/28/03

Review: Analysis of Wireless Sensor Networks for Habitat Monitoring Polastre, Szewczyk, Mainwaring, Culler. Review by Nate Ota CS294 8/28/03. The Application: Great Duck Island. Motivation: use a habitat monitoring application to deploy a long term network Problem

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Review by Nate Ota CS294 8/28/03

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  1. Review: Analysis of Wireless Sensor Networks for Habitat MonitoringPolastre, Szewczyk, Mainwaring, Culler Review by Nate Ota CS294 8/28/03

  2. The Application: Great Duck Island • Motivation: use a habitat monitoring application to deploy a long term network • Problem • Human interaction impact w/ environment • Node interaction impact w/ environment • “shadowing effect” • Cost of equipment and personnel • Approach • Use tiered architecture sensor network to address problems and make data available locally and remotely (sensor patch, gateway, base station)

  3. The Application: Great Duck Island

  4. Packet Loss • Expected 4.8M, Actual 1.1M readings • Pattern of packet loss despite expected CSMA correction • Sources • Packet collisions • Clock skew and capture effect • Not major source of loss • Use signal strength meter to avoid false “pkts” • Environmental Conditions • Failed temp correlated to failed humidity sensors • High humidity correlated with significant voltage drop • Battery state • Drain due to moisture, but not a cause of node failure • Related to high moisture

  5. Power Management • Only 5 nodes exhaust battery • Non-graceful degradation • Battery not meant periodic use

  6. Last Points • Failure • Abnormally high moisture • Clock skew • Exposure to wildlife • Battery matching to application • Sensor readings can be used to predict node failure

  7. Before the slaughter… • Anyone need a partner for the assignment

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