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Computers RSS FeedsData Processing in the Early Cosmic Ray Experiments in Sydney - The cosmic ray air shower experiment set up at the University of Sydney in the late 1950s was one of the first complex experiments in Australia to utilize the power of an electronic computer to process and analyse the experimental data. The paper provides a brief overview of the design and construction of the equipment for the experiment and the use of the computer SILLIAC in the processing and analysis of the data. The central role of Chris Wal...Feed Source: comjnl.oxfordjournals.org Three Kinds of Probabilistic Induction: Universal Distributions and Convergence Theorems -
We will describe three kinds of probabilistic induction problems, and give general solutions for each, with associated convergence theorems which show that they tend to give good probability estimates. The first kind extrapolates a sequence of strings and/or numbers. The second extrapolates an unordered set of strings and/or numbers. The third extrapolates an unordered set of ordered pairs of elements that may be strings and/or numbers. Given th... Wallace's Approach to Unsupervised Learning: The Snob Program -
We describe the Snob program for unsupervised learning as it has evolved from its beginning in the 1960s until its present form. Snob uses the minimum message length principle expounded in Wallace and Freeman (Wallace, C.S. and Freeman, P.R. (1987) Estimation and inference by Compact coding. J. Roy. Statist. Soc. Ser. B, 49, 240–252.) and we indicate how Snob estimates class parameters using the approach of that paper. We will survey the e... Some Comments on C. S. Wallace's Random Number Generators -
We outline some of Chris Wallace's contributions to pseudo-random number generation. In particular, we consider his recent idea for generating normally distributed variates without relying on a source of uniform random numbers and compare it with more conventional methods for generating normal random numbers. Implementations of Wallace's idea can be very fast (approximately as fast as good uniform generators). We discuss the statistical quality ... Multiplier Evolution: A Family of Multiplier VLSI Implementations -
This paper provides an overview of four floating point multiplier implementations spanning microprocessor designs from 1992 to the present. The algorithm of each multiplier is explored in detail, and key measures of area, delay and design complexity are compared. The approaches span from a simple linear array to a full tree-based network, each targeted at efficient very-large-scale integration implementation. The designs show a progression of im... Password-Capabilities and the Walnut Kernel -
The Walnut kernel is a capability-based operating system kernel that was developed in the Department of Computer Science at Monash University during the 1990s. This kernel is heir to many of the ideas that were implemented in the Password- Capability System. Focusing on the programmer's view, this paper describes the password-capability model and the features of the Walnut kernel and the design decisions taken in creating it. An ANSI compliant s... DNA Profiles Link Dope to Its Source - 09 Jul 03
Forensic scientists in the U.S. are applying DNA fingerprinting methods to the cannabis plant. They say the technique, which is being used to create a database of DNA profiles of different marijuana plants, will help them to trace the source of any sample.
'It links everybody together: the user, the distributor, the grower,' says the database's creator, Heather Miller Coyle of the Connecticut State Forensic Science Laboratory in Meriden... Mathematics: Does the Proof Stack Up? - by George Szpiro
03 Jul 03
Just under five years ago, Thomas Hales made a startling claim. In an e-mail he sent to dozens of mathematicians, Hales declared that he had used a series of computers to prove an idea that has evaded certain confirmation for 400 years. The subject of his message was Kepler's conjecture, proposed by the German astronomer Johannes Kepler, which states that the densest arrangement of spheres is one in which they are stack... Scientists Discover Planetary System Similar to Our Own -
The image shows an impression by David A. Hardy of a possible scene from a moon orbiting the extra-solar planet in orbit around the star HD70642. Photo Credit: David A. Hardy.
... Hacker How-To Good Summer Reading - by Michelle Delio
27 Jun 03
Stealing the Network: How to Own the Boxby Ryan RussellSyngress, 330 pp., $49.95
Stealing The Network: How to Own the Box, a compendium of tales written by well-known hackers, is a perfect summer read. The stories are fictional. The technology and techniques described are very real.
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