Brian W. Johnson

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This paper presents the design of a three-dimensional data acquisition system based on multiple, single-dimensional optical sensors. The system can operate in any of three modes: (1) the tracking of multiple, independent, point light sources (2) the automatic digitization of opaque surfaces (3) the real-time tracking of an unmarked moving object (e.g.,(More)
The consumption of powder additives applied in a simple powder form has fallen from almost 60 % to below 40% during the last 5 years. This change is not remarkable given the many problems associated with powders, ranging from health & safety to transport, storage and feeding issues. What is more remarkable is that, although a very slight increase in(More)
A model and methodology for hardware-software codesign. 85 design. For example, the representation of the service time in the case of the server unit in a queue, would be very useful to the designer. The performance modeling stage often forms the bottleneck of the system design process and also often the most diicult one. VHDL design libraries supporting(More)
A microcomputer-based optimal control system for electric wheelchairs is presented. As the weight of a wheelchair is generally small compared to that of a user, the user's actual weight can have a tremendous impact on the dynamics of the wheelchair. The velocity feedback controller presented here was designed to give an optimal response for all users by(More)
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