Traditionally, expensive custom hardware has been required to implement data-intensive sonar beamforming algorithms in real-time. We develop a sonar beamformer in software by merging the following recent technologies: (1) symmetric multiprocessing on Unix workstations, (2) lightweight POSIX threads

Direct manipulation is one approach to the creation of software which can make use of the high resolution graphics and pointing device available on a workstation like a Sun 3. A direct manipulation tool is typically used to manipulate a complex system like, for example, a le system, and works

to non-sighted users, it will be necessary to develop a new interface which replaces the visual communication with audio and tactile communication. This paper describes the Mercator Environment---an auditory and tactile interface to X Windows and Unix workstations designed for the visually impaired

to collect and analyze file system statistics for UNIX-based file systems. The collection system runs in user-space and requires no modification of the operating system kernel. The statistics package provides details about file system operations at the file level: creations, deletions, modifications, etc

The paper describes the the development of a customised computer software package for easing the analysis of the 1991 Sample of Anonymised Records. The resulting USAR package is designed to be portable within the unix environment. It offers a number of features such as interactive table design

in the process). A modem is a device which turns computer babble into a form which can travel along phone lines and which can be converted back with little or no loss (see section 4.2 below) by another modem. We bought a bunch of modems and I tried to hook them up to various Unix workstations. It should have

Traditionally, expensive custom hardware has been required to implement data-intensive sonar beamforming algorithms in real-time. We develop a sonar beamformer in software by merging the following recent technologies: (1) symmetric multiprocessing on Unix workstations, (2) lightweight POSIX threads

Coda is a file system for a large-scale distributed computing environment composed of Unix workstations. It provides resiliency to server and network failures through the use of two distinct but complementary mechanisms. One mechanism, server replication,stores copies of a file at multiple

TreadMarks is a distributed shared memory (DSM) system for standard Unix systems such as SunOS and Ultrix. This paper presents a performance evaluation of TreadMarks running on Ultrix using DECstation-5000/240's that are connected by a 100-Mbps switch-based ATM LAN and a 10-Mbps Ethernet

I would like to dedicate this report to my wife, Dara Marie, and to our 14-month-old daughter, Sabrina Fair. Thank you for providing me with the quiet time I needed to complete this report. Once again, I can join in the chase. And also to my parents and extended family, for their encouragement, and for always stressing the value of education. Acknowledgements I would like to thank the talented people in the Advanced Sonar Group at Applied Research Laboratories, The University of Texas at Austin, for their years of guidance and support, and for providing me the time and equipment to produce this research. I would especially like to thank Terry Brudner, Mike DeSimone, Steve Morrissette, and Jeff Napper for their insight and assistance. August 10 th, 1998 v Real-Time Sonar Beamforming on a Symmetric Multiprocessing