But the disadvantages are heavy communication cost and corresponding influence on enegy cost , network communication load and positioning time
4.
The study result shows that the complete dynamic response process of structure varying with loads is showed with time history method , and the position time and damaging style are showed when the cracks appear
5.
In the lamost ( large area multi - object fiber spectroscope telescope ) project , 4000 optical fibers are mounted on its focal plane which diameter is 1 . 75m . the positioning precision less than 40 microns , and positioning time less than 30 minutes
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