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An unusual event occurred on February 12, 2001: a manmade satellite safely landed on the surface of a twentyone mile long hunk of space rock two hundred million miles from Earth. It then sent(More)
This design allows generation of a wide range of waveforms from subaudio to ultrasonic directly via software. Waveforms may be calculated on the fly by suitable algorithms or produced from previously(More)
Machine vision is an important component of medical systems engineering. Inexpensive miniature solid state cameras are now available. This paper describes how these devices can be used as artificial(More)
Around 4 o'clock this morning a large storm cell blew through Houston, knocking down trees and disrupting power service. The thunder was deafening; it was impossible to go back to sleep. As I sat in(More)