1-1 無線網路簡介 1. wireless ad hoc network 2. wireless sensor network
Cyber Cattle on the Wireless Range 是學生 ? 還是科學怪人 ?
What Can Ad Hoc Networks Can Do for You? Paper: “Virtual Fences for Controlling Cows” by: Bulter, Corke, Peterson, and Rus from: Workshop on Applications of Mobile Embedded Systems (with MobiSys 2004)
Motivations Herding is a very labor intensive activity. Animals are rotated frequently between paddocks to prevent overgrazing of any one pasture. Farmers spend huge amounts of time and money fixing and maintaining fences. This work: the first step toward automatically controlling the location of individual animals as well as the herd.
State of the Art physical agent: sheepdog, robot, etc. stimulation device: simple collar which provides an electric shock when it is in close proximity to a buried perimeter wire
Approach of the Authors (Dartmouth College) virtual fence: smart collar for cows: GPS unit, Zaurus PDA, wireless networking, and sound amplifier sound stimulus: whose volume is proportionate to the distance from the boundary. such as roaring tiger, barking dog, hissing snake. to repel from obstacles or wireless Ad Hoc Network: formed by wireless devices with multi-hop communication capability.
Posts and barbed wire are part of the scenery on most ranches. But satellite technology is making it possible to guide animals over rangeland with electronically generated cues ( 指示 ) rather than traditional fences and cattle drives.
On the 300-square-mile Jornada Experimental Range near Las Cruces, New Mexico, technicians Rob Dunlap (left) and John Smith round up cattle the time-honored way. High-tech equipment may make roundups easier in the future.
Craig Hale (left), of Future Segue, and animal scientist Dean Anderson examine the prototype virtual fence device they invented. Audio cues generated from the device tell the cattle which way to move.
Technician Roy Libeau (left) and Anderson place a neck saddle containing the prototype virtual fence system on a cow.
The prototype virtual fence device is shown here as a neck saddle. Future versions may be reduced to the size of an ear tag or smaller.
Cattle and sheep grazing together in a "flerd." The animals are bonded socially, so they remain together.
Gary Rayson (left), an associate professor at New Mexico State University, and Anderson use fluorometry to rapidly determine diet composition of free-ranging herbivores.
Conclusions physical informaiton: location, sensing data wireless connectivity (multi-hop) multi-discipline research (need to work with farmer, biologist, etc.)
Goal of Wireless Sensor Networks Embedding wireless networking and computing in sensors with low cost.
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