Chapter2_Sensor - Evolution of Computing Devices Wireless...

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1 1 Wireless Sensor Networks 2 Evolution of Computing Devices RF Chips/Sensors Supercomputer Mainframe Server Workstation PC PDA Watch Smart Card ??? $10,000,000 $1,000,000 $100,000 $10,000 $1,000 $100 $10 $1 $0.1 $0.01 Cluster/ Grid Embedded systems 3 Sensor Networks Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. Sensor Node: Sensing, Computation, Communication . The sensor networks can be used for various application areas (e.g., health, military, home). For different application areas, there are different technical issues that researchers are currently resolving. 4 Mote Platform Evolution 5 Sensor Network Communication Architecture The sink may communicate with the task manager node via Internet or Satellite. Each of these scattered sensor nodes has the capabilities to collect data and route data back to the sink 6 Questions concerning sensor networks How do we (dynamically) set up an efficient tree in a sensor network? How does aggregation of results take place? Can it be controlled? What happens when network links fail?
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2 7 Revolutionary Applications • Monitoring Spaces – Env. Monitoring, Conservation biology, . .. Precision agriculture, built environment comfort & efficiency . .. alarms, security, surveillance, treaty verification . .. • Monitoring Things condition-based maintenance disaster management urban terrain mapping & monitoring 1 5 1 3 1 4 6 5 ` 1 1 8 1 29 Earthquake Response, Glaser et al. Wind Response Of Golden Gate Bridge Condition-Based Maintenance Intel Research 8 Revolutionary Applications • Monitoring Spaces – Env. Monitoring, Conservation biology, . .. Precision agriculture, built environment comfort & efficiency . .. alarms, security, surveillance, treaty verification . .. • Monitoring Things condition-based maintenance disaster management urban terrain mapping & monitoring • Interactive Environments – Ubiquitous computing – handicap assistance home/elder care asset tracking • Integrated robotics CENS.ucla.edu 9 Research on Wireless Sensor Networks Data dissemination and aggregation Sensor localization Routing protocols Sensor Scheduling • Coverage problems 10 Example: Data Aggregation Organizing a sensor network database, while storing and processing data (a) only at the operator’s site or … 11 Example: Data Aggregation Organizing a sensor network database, while storing and processing data … or (b) only at the sensors. 12 Research in WSN One essential design goal of WSN protocols is energy efficient node sleeping minimizing communication minimizing computation Location based protocols proved to be effective in energy saving due to its simplicity Location aware routing (LAR, GPSR) Geographical node scheduling (GAF) – Coverage solutions
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3 13 Complicated Environments Complicated Environments Obstructed Area Forrest, mountains, hills, areas with sizable obstacles Concave Area Valleys, rivers, streets separated by buildings Problems
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This note was uploaded on 10/27/2009 for the course CSE 830 taught by Professor Ofria during the Fall '08 term at Michigan State University.

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Chapter2_Sensor - Evolution of Computing Devices Wireless...

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