Showing papers by "Albert Kai-Sun Wong published in 1995"

Asynchronous transfer mode switch architecture

Abstract: A high capacity packet switch is implemented using an expansion module that divides an incoming packet cell into a plurality of segments and supplies the segments, based on their sequential order, to respective ones of a plurality of concentrator units contained in the expansion module. Each concentrator unit includes a plurality of concentrator logic units and one of those logic units accepts a segment for storage based on routing information contained in the packet cell. The stored segments forming a packet cell are thereafter unloaded and recombined in proper sequence for routing to a packet switch module, which then forwards the packet cell toward its destination.

Design of a focal-plane array thermographic system for stress analysis

Abstract: A state-of-the-art thermographic system has been developed based on a 512×512 focal-plane array thermal imager. The system, dubbed FAST (for focal-plane array for synchronous thermography) is able to deliver high-resolution full-field thermoelastic stress scans in minutes rather than hours. The paper itemizes the hardware components together with their functions.

Performance of the FAST system for stress analysis

Abstract: A state-of-the-art thermographic system has been developed based on a 512×512 focal-plane array thermal imager. The system was primarily designed to perform stress analysis, but has applications in other areas where small cyclic temperature variations are encountered. A detailed analysis of its performance relative to an existing equipment (SPATE) revealed that, at least for low frequency applications, the proposed system out performs SPATE by some two to three orders of magnitude such that high-resolution area scans can now be achieved in minutes instead of hours. It is suggested that higher frequency applications (i.e., order of 102 Hz) can be achieved with more up-to-date imagers.

Dynamic ATM network access control using an availability parameter at each port in the path

Abstract: A facility is provided in an ATM network to control the level of data traffic that a source of data supplies to the network for transmission over an associated connection. Such control is achieved by associating a scout cell with an availability parameter (Ac) and also associating each output port serving a segment of a connection with an availability parameter (Ap) indicative of the level of congestion at the port. Responsive to receipt of a scout cell, an output port overwrites the availability parameter (Ac) contained in the scout cell with its availability parameter (Ap) only if the latter value is less than the former value. The output port then forwards the scout cell to its intended destination. The destination port performs the same function, and then returns the scout cell to its originator via the reverse direction of the connection. Accordingly, the value of the availability parameter Ac contained in a returned scout cell thus indicates whether or not congestion exists at a point along the forward direction of a connection. That is, the value of Ac will be a minimum of all of the port availability parameters (Ap1, Ap2, .... Apn) values that the cell encountered as it traversed the associated connection. The level of such control is then determined as a function of the value of the availability parameter contained in the received scout cell.