1. Research Bytes Bob Kinicki October 13, 2006

2. Network Protocols and Wireless Networks

3. Research Bytes October 13, 2006 3 Streaming Video Video Frames Slide courtesy of Huahui Wu

4. MediaPlayer ™ vs. RealPlayer ™ A Comparison of Network Turbulence

5. Research Bytes October 13, 2006 5 Real vs WMP Playout Rate RealPlayer buffers at a higher rate

6. Research Bytes October 13, 2006 6 Streaming Video over Wireless Video Frames Wired network AP

7. Research Bytes October 13, 2006 7 Wireless Streaming Multimedia Lab Topology Slide courtesy of Mingzhe Li

8. Research Bytes October 13, 2006 8 Wireless Measurement Study Slide courtesy of Feng Li

9. Research Bytes October 13, 2006 9 Frame Retries and Packet Loss Figure 7: Wireless Layer Retry Fraction Figure 8: UDP Ping Loss Fraction AP queue causes high packet loss

10. Research Bytes October 13, 2006 10 Rate Constrained TFRC  A seven-hop chain network was simulated.  The TFRC sending rate is manually constrained.  The MAC layer saturates at 300Kbps.

11. Wireless Sensor Networks (WSNs)

12. Research Bytes October 13, 2006 12 Camalie Vineyards Case Study in Crossbow Mote Deployment Copyright 2006 Camalie Vineyards, Not to be reproduced without written permission

13. Research Bytes October 13, 2006 13 Water in the Vineyard

14. Research Bytes October 13, 2006 14 Vineyard Installation At each Mote location: 2 soil moisture sensors 12” and 24” depth 1 soil temp sensor to calibrate soil moisture sensors

15. Research Bytes October 13, 2006 15 Power Supply  2 month max battery life now with 10 minute sampling interval  Decided to use solar power, always there when doing irrigation. Solar cell $10 in small quantities though and need a $.50 regulator.

16. Research Bytes October 13, 2006 16 Vineyard Mote Prototype 433MHz Mica2dot Solar power supply Up to 6 resistive sensor inputs

17. Research Bytes October 13, 2006 17 Network Maps Irrigation Block Map 13 nodes late 05, Now 18 nodes

18. Research Bytes October 13, 2006 18 Soil Moisture Data  Red = 12” depth soil moisture  Green= 24” depth soil moisture  Note delay deeper  More frequent, shorter watering keeps water shallow

19. Research Bytes October 13, 2006 19 WSNs for Assisted Living Berkeley Fall Detection System Alarm-Net University of Virginia

20. Research Bytes October 13, 2006 20 WSNs for Assisted Living

21. Research Bytes October 13, 2006 21 WSNs for Assisted Living Two-Tiered WSN Architecture

22. Research Bytes October 13, 2006 22 Berkeley Fall Detection System

23. Research Bytes October 13, 2006 23 Berkeley Fall Detection System

24. Research Bytes October 13, 2006 24 Thank You !! Corks