Research Bytes Bob Kinicki October 13, 2006

Network Protocols and Wireless Networks

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

MediaPlayer ™ vs. RealPlayer ™ A Comparison of Network Turbulence

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

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

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

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

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

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

Wireless Sensor Networks (WSNs)

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

Research Bytes October 13, Water in the Vineyard

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

Research Bytes October 13, 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.

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

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

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

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

Research Bytes October 13, WSNs for Assisted Living

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

Research Bytes October 13, Berkeley Fall Detection System

Research Bytes October 13, Berkeley Fall Detection System

Research Bytes October 13, Thank You !! Corks