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VMDSVehicle Mounted Data System (routing system)
VMDSVideo Motion Detection System
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References in periodicals archive ?
Droplets were measured for volume median diameter (VMD), calculated using the Yeomans method.
Droplets were measured as described for the previous Trial Sets, and VMD, numerical median diameter (NMD), and droplet density were calculated for each sampling station.
One hundred drops (if available) were counted from each slide, and VMD, NMD, and droplet density were recorded.
Droplet VMD ranged from approximately 32 [micro]m 1,700 ft (518.2 m) from the aircraft release point, increasing to approximately 50 [micro]m at 3,400 ft (1036 m) and 5,100 ft (1,554.5 m), followed by a roughly linear decrease in VMD at 13,600 ft (4,145.3 m) from release point.
The VMD of droplets was greatest at sampling station 1, exceeding 50 [micro]m, and ranged from 28-42 [micro]m at the remainder of the stations.
Droplet size (VMD) ranged from approximately 43 [micro]m at the sampling station 2500 ft (762 m) downwind, generally decreasing to 27 [micro]m 10,000 ft (3048 m) downrange.
GIS is now being marketed to other organisations around the country and it is thought that local authority fire brigades, in particular, could capitalise on the VMDS potential.
As described by Damjanovski in his book CCTV, video motion detection (VMD) analyzes a video signal at its input and determines whether its contents have changed.
Sources of movement such as birds, animals, blowing debris, dust, snow, ram, fog, and cloud shadows, as well as camera shake, may cause invalid alarms, although individual VMDs vary in their susceptibility to these factors.
Two types of VMD sensors are available: one detects contrast changes and is best suited for indoors or for very short range applications outdoors; the other, an exterior model, uses digital signal processing to detect not only contrast changes but also factors such as target size, speed, and movement.
Prices to the end-user are expected to rise by no more than 3 percent per year, with the possible exception of VMDs. VMDs experienced exceptional growth in 1994 as security managers realized that, coupled with CCTV, this technology could noticeably reduce false alarm rates.
Growth will help end-users by increasing competition and putting downward pressure on prices of VMD units, which are expensive.