Vectorial Approach to Fast Correlation Attacks

A new, vectorial approach to fast correlation attacks on binary memoryless combiners is proposed. Instead of individual input sequences or their linear combinations, the new attack is targeting subsets of input sequences as a whole thus exploiting the full correlation between the chosen subset and the output sequence. In particular, the set of all the input sequences can be chosen as the target. The attack is based on a novel iterative probabilistic algorithm which is also applicable to general memoryless combiners over finite fields or finite rings. To illustrate the effectiveness of the introduced approach, experimental results obtained for random balanced combining functions are presentedMost of this work was done while he was with Rome CryptoDesign Center, Gemplus, Italy     

Soft modelling in risk communication and management: examples in handling food risk

Our aim in this paper is to explore the use of soft modelling in an integrated risk communication and management process for managing uncertainties and ‘scares’ in the public domain, particularly in the area of food risk and safety. Much has been written in the past 20 years on the issues relating to the management and communication of food risks and safety issues to the public. Most of this research has been based upon post hoc studies of what went wrong—or, occasionally, right. Here we survey those findings briefly, and draw these into a general framework for risk management and communication. By integrating these into a coherent common framework, we believe that public authorities, food producers and industry may develop more effective strategies for managing and communicating risks which, in turn, will enable the public to make more informed decisions on their diet.     

On the Motion of a Dynamic System with Minimal Dissipation

The motion of a holonomic scleronomic non-conservative mechanicalsystem with minimal dissipation is considered. As applicationsof the theory several problems are studied in detail.     

Consensus of opinion

In a decision analysis, it is often necessary to combine a group of individuals' beliefs into a consensus probability distribution. This paper addresses the question whether it is possible to base such consensus distributions only upon the information present within the group or must some arbitrary rule be used to resolve disagreement. Some earlier work on modifying beliefs in the light of another's opinion is developed to apply to groups of n people. Using this as a “benchmark of rationality”, standard methods of forming group consensus probability distributions are found somewhat arbitrary. Furthermore it is argued that the possibility of constructing better procedures is remote.     

Study of the centrally produced ωρ0 and ωω systems inpp interactions at 300 GeV/c

We have performed a search for vector-vector final states centrally produced in proton proton interactions at 300 GeV/c using the CERN Ω spectrometer. Evidence is found for ωρ⁰ production in the reactionpp→p _f (2π⁺2π^?2π⁰)p _s and for ωω production in the reactionpp→p _f (2π⁺2π^?2π⁰)p _s . However no evidence is found for ωø production in the reactionpp→p _f (K ⁺ K ^?π⁺π^?π⁰)p _s .     

Computational studies of intrinsic defects in silver chloride

We report a new Density Functional Theory study of the geometries, energies and mobilities of bulk defects in AgCl. A full survey of theoretical parameters has been performed to check the reliability of density-functional methods for calculations on the silver halides. We then calculate both Frenkel and Schottky defects in the bulk using supercell methods, employing a localised basis set. Good agreement has been found between calculated defect formation energies and experimental values, in particular our calculations accurately reproduce the observed cation Frenkel energy of the materials - one of the major challenges for any theoretical method.     

Inductively Coupled,Plasma Source Mass Spectrometry - A New Element/Isotope Specific Mass Spectrometry Detector for Chromatography

A new mass spectrometry detector for chromatography is described. It is element/isotope specific. The interfacing of GC with the detector is very simple, consisting of a short (0. 5m) stainless steel tube. Oxygen gas (about 20% of total sample gas flow) must be injected, into the GC effluent entering the torch, to prevent carbon buildup on the torch. Three pentylated tin compounds (Me₃SnPe, Me₂SnPe₂ and MeSnPe₃) were separated and determined using the system. Although detection limits (ng's) achieved in this preliminary work were worse by over 2 orders of magnitude compared to state-of-the-art electrothermal atomic absorption detection, the approach holds much promise for the future in environmental/clinical metal organic species investigations.