Charles Nicholas

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Distributed Intrusion Detection Systems (DIDS) offer an alternative to centralized intrusion detection. Current research indicates that a distributed intrusion detection paradigm may afford greater coverage, consequently providing an increase in security. In some cases, DIDS offer an alternative to centralized analysis, consequently improving scalabity.(More)
Solute diffusion coefficients (D) can indicate a dependence upon actual solute concentrations. Here a single compartment has been utilized, in which effective HCl diffusion to a membrane-mounted glass pH electrode can be measured across the pH spectrum. The study has investigated HCl diffusion through both mucus and water layers as a function of HCl(More)
We describe an implementation and experiments with a low-distortion randomized projection algorithm [LINI94] that can reduce the number of dimensions in the data by a considerable amount. The performance of the randomized algorithm is compared with that of a popular technique-Principal Component Analysis (PCA). The experiments show that the randomized(More)
An electrochemical approach to the determination of permeability through native mucus gel of simple electrochemically active solutes is reported. For all the solutes studied, a reduction in effective diffusion coefficients was observed, with retardation of solute flux by a factor of at least two. However, NADH and the dicarboxylic acid derivative of(More)
We have used total internal reflection fluorescence (TIRF) to measure the adsorption kinetics of a newly synthesized fluorescent derivative of a triblock copolymer comprising two poly(ethylene oxide) arms connected by a poly(butylene oxide) segment. The composition is (EO)400 (BO)55 (EO)400, in which EO represents ethylene oxide, BO represents butylene(More)
Identifying parallel corpora can be an important step in a variety of tasks related to information retrieval. However, at present to identify parallel corpora requires human experts to examine the texts and evaluate their respective contents. We assume in this research that texts which are translations of each other have similarities in their semantic(More)
Documents, particularly electronic documents that are created, disseminated , and used with computers, have several representations. Users may wish to work with such electronic documents in any of a document's representations, and this can make it diicult to maintain consistency between the diierent representations of a document. Category theory provides(More)