5,079 research outputs found

    NMESys: An expert system for network fault detection

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    The problem of network management is becoming an increasingly difficult and challenging task. It is very common today to find heterogeneous networks consisting of many different types of computers, operating systems, and protocols. The complexity of implementing a network with this many components is difficult enough, while the maintenance of such a network is an even larger problem. A prototype network management expert system, NMESys, implemented in the C Language Integrated Production System (CLIPS). NMESys concentrates on solving some of the critical problems encountered in managing a large network. The major goal of NMESys is to provide a network operator with an expert system tool to quickly and accurately detect hard failures, potential failures, and to minimize or eliminate user down time in a large network

    LinkFinder: An expert system that constructs phylogenic trees

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    An expert system has been developed using the C Language Integrated Production System (CLIPS) that automates the process of constructing DNA sequence based phylogenies (trees or lineages) that indicate evolutionary relationships. LinkFinder takes as input homologous DNA sequences from distinct individual organisms. It measures variations between the sequences, selects appropriate proportionality constants, and estimates the time that has passed since each pair of organisms diverged from a common ancestor. It then designs and outputs a phylogenic map summarizing these results. LinkFinder can find genetic relationships between different species, and between individuals of the same species, including humans. It was designed to take advantage of the vast amount of sequence data being produced by the Genome Project, and should be of value to evolution theorists who wish to utilize this data, but who have no formal training in molecular genetics. Evolutionary theory holds that distinct organisms carrying a common gene inherited that gene from a common ancestor. Homologous genes vary from individual to individual and species to species, and the amount of variation is now believed to be directly proportional to the time that has passed since divergence from a common ancestor. The proportionality constant must be determined experimentally; it varies considerably with the types of organisms and DNA molecules under study. Given an appropriate constant, and the variation between two DNA sequences, a simple linear equation gives the divergence time

    Gravitational wave background in perfect fluid quantum cosmologies

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    We discuss the gravitational wave background produced by bouncing models based on a full quantum evolution of a universe filled with a perfect fluid. Using an ontological interpretation for the background wave function allows us to solve the mode equations for the tensorial perturbations, and we find the spectral index as a function of the fluid equation of state.Comment: 12 pages, 5 figures, to appear in Phys. Rev. D (2006

    Developing Wildlife Management Into A Successful Business

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    Wildlife management has been developed into a successful business. The company was set up after the principal shareholder was made redundant after over 30 years in the wildlife management field. The company has been successful, as it diversified into a consultancy and supply company, and targeted a wide range of animal species and equipment


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    In parts of New Zealand the beef and dairy industry is being threatened by possums spreading bovine tuberculosis to cattle. As a result new strategies for the long term control of possum populations have been developed. For these strategies, management plans are prepared which detail the control program for each area. New control strategies are being developed which include long term annual control to reduce infestation of treated areas. Research is being increased in an attempt to find long term answers with improved control techniques and more importantly the possibilities of biological control. Central and Local Government are providing long term funding for these management plans

    Resonance Production in STAR

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    The recent results from resonance production in central Au+Au and p+p collisions at sNN=\sqrt{s_{\rm NN}} = 200 GeV from the STAR experiment at RHIC are presented and discussed.Comment: 7 pages, proceedings 19th Winter Workshop on Nuclear Dynamics, Breckenridge, Colorado, USA, February 8-15, 200

    System size dependence of strangeness production at 158 AGeV

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    Strange particle production in A+A interactions at 158 AGeV is studied by the CERN experiment NA49 as a function of system size and collision geometry. Yields of charged kaons, phi and Lambda are measured and compared to those of pions in central C+C, Si+Si and centrality-selected Pb+Pb reactions. An overall increase of relative strangeness production with the size of the system is observed which does not scale with the number of participants. Arguing that rescattering of secondaries plays a minor role in small systems the observed strangeness enhancement can be related to the space-time density of the primary nucleon-nucleon collisions.Comment: 5 pages, 3 figures, Presented at Quark Matter 2002, Nantes, Franc

    Scaling of the charm cross-section and modification of charm pTp_{T} spectra at RHIC

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    Charm production from the direct reconstruction of D0D^0 (D0‚ÜíKŌÄD^0\to K\pi up to 2 GeV/cc) and indirect lepton measurements via charm semileptonic decays (c‚Üíe+Xc\to e+X at 0.9\textlesspTp_T\textless5.0 GeV/cc and c‚Üíőľ+Xc\to \mu+X at 0.17\textlesspTp_{T}\textless0.25 GeV/cc) at sNN=200\sqrt{s_{_{NN}}}=200 GeV Au+Au collisions are analyzed. The transverse momentum (pTp_T) spectra and the nuclear modification factors for D0D^0 and for leptons from heavy flavor decays is presented. Scaling of charm cross-section with number of binary collisions at sNN=200\sqrt{s_{_{NN}}}=200 GeV from d+Au to Au+Au collisions is reported.Comment: 4 pages, 4 figures, proceedings for Quark Matter 200

    Perturbations in Bouncing Cosmological Models

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    I describe the features and general properties of bouncing models and the evolution of cosmological perturbations on such backgrounds. I will outline possible observational consequences of the existence of a bounce in the primordial Universe and I will make a comparison of these models with standard long inflationary scenarios.Comment: 9 pages, no figure
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