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Computers RSS FeedsIntroduction to the Special Issue on Probability Models in Performance Analysis - This special issue includes research papers related to a workshop held at the Royal Society on 21st of September 2010, honouring Erol Gelenbe on his 65th birthday. The workshop brought together some 40 participants including some of Erol's former and current PhD students, colleagues and friends with whom he has interacted over the years, both in Europe and the USA. The papers focus on probability models in computer science, at the core of the fi...Feed Source: comjnl.oxfordjournals.org Neural Memories and Oscillatory Operation -
This paper develops two themes. The first is to show that the task of ‘recognition’ can be realized by an artificial neural net, and that the structures thus generated can be in close analogy to those observed in nature. The second is to note that absolute signal levels are almost meaningless in biological contexts; for these, the current state of a system is revealed by dynamic rather than static behaviour. This was Walter Freeman's... Chaotic Evolution via Generalized Probabilistic Automata (Probabilistic Arrays) -
An n-state generalized probabilistic automaton/array maps a list of d states stochastically into a next state, resulting in a degree-d polynomially nonlinear transformation of the n-component state-probability vector, in contrast with the linear transformation given by the conventional Markovian model. This nonlinearity introduces the possibility of chaotic behaviour as time (iteration) progresses. It is shown that for two-state systems, the d =... A Stochastic Geometry Model for Cognitive Radio Networks -
We propose a probabilistic model based on stochastic geometry to analyze cognitive radio in a large wireless network with randomly located users sharing the medium with carrier sensing multiple access. Analytical results are derived on the impact of the interaction between primary and secondary users, on their medium access probability, coverage probability and throughput. These results can be seen as the continuation of the theory of priorities... Scheduling Services in a Queuing System with Impatience and Setup Costs -
We consider a single-server queue in discrete time, in which customers must be served before some limit sojourn time of geometrical distribution. A customer who is not served before this limit leaves the system: it is impatient. The service of customers, the loss due to impatience and the holding of customers in the queue induce costs. The purpose is to decide when to serve the customers so as to minimize them. We use a Markov decision process w... Bounding Aggregations for Transient and Stationary Performance Analysis of Subnetworks -
We consider large queueing networks for which transient and stationary probability distributions are very difficult or impossible to obtain due to the state space explosion problem. In performance analysis, we need in general to study only a part of the network (a node or a path). Thus, we propose to define bounding systems that lead to compute bounds on performance measures of the considered subsystem. The original large state space is mapped i... An Optimal Inherently Stabilizing 2-Neighborhood Crash Resilient Protocol for Secure and Reliable Routing in Hypercube Networks -
Many fundamental problems in the area of distributed systems such as security, reliable routing, network survivability and broadening available bandwidth can be addressed through the use of disjoint paths between communication endpoints. Therefore, distributed solutions to the disjoint paths problem are of crucial importance to these fundamental problems. Disjoint paths naturally exist in traditional networks; however, these networks provide no ... Analyzer: A Complex System for Data Analysis -
Recently eXtensible Markup Language (XML) has achieved the leading role among languages for data representation and, thus, we can witness a massive boom of corresponding techniques for managing XML data. Most of the processing techniques, however, suffer from various bottlenecks worsening their time and/or space efficiency. We assume that the main reason is they consider XML collections too globally, involving all their possible features, althou... Design Techniques Targeting Low-Area-Power-Delay Product in Hyperbolic CORDIC Algorithm -
The COordinate Rotation DIgital Computer (CORDIC) algorithm is a famous technique for realizing complex arithmetic functions using simple shift-add operations. This paper presents a novel completely scaling-free CORDIC algorithm in rotation mode for high performance hyperbolic computations. We target algorithm level improvements to achieve low area and power-delay product on FPGA. Instead of complex search algorithms, we use the most significant... RNS-Based Elliptic Curve Point Multiplication for Massive Parallel Architectures -
Acceleration of cryptographic applications on massive parallel computing platforms, such as Graphic Processing Units (GPUs), becomes a real challenge concerning practical implementations. In this paper, we propose a parallel algorithm for Elliptic Curve (EC) point multiplication in order to compute EC cryptography on these platforms. The proposed approach relies on the usage of the Residue Number System (RNS) to extract parallelism on high-preci... Has Your Disk Space Reached Critical Levels? + The Secret To Checking Your Email Anytime, Anywhere + Open Up Your Internet World With iGoogle -
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... 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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