135 research outputs found
Réactions de gonflement interne du béton : effets mécaniques à l’échelle du matériau et de la structure
No full textPrésentation des travaux de l'Ifsttar (laboratoire EMMS) sur les réactions de gonflement interne du béton
Electro-mass olfactory multi-sensor (EMMS)
No full textFor an olfactory sensor or electronic nose, the task is not only to detect the object concentration, but also to recognize it. It is well known that all the elements can be identified by their charge to mass ratio e(+)/m. We tried to imitate this principle for molecular recognition. Two kinds of sensors are used simultaneously in testing. One is quartz crystal microbalance (QCM) for detecting the change in mass, the other is interdigital electrode (IE) for detecting the change in conduction, as an electro-mass multi-sensor (EMMS). in this paper, the principle and the feasibility of this method are discussed. The preliminary results on the recognition of alcohol by EMMS coated with lipids are presented. Meanwhile, the multi-sensor can also be used as an instrument for research on some physico-chemistry problems. The change in conduction of coated membrane caused by one absorbed molecule is reported. It is found that when a QCM is coated with membrane, it still obeys the relationship Delta F (frequency change of QCM) = K Delta m (mass change of absorbed substance) and the proportional coefficient, K, depends not only on quartz properties but also on membrane characteristics as well. (C) 2000 Elsevier Science S.A. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000088378500028&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, AnalyticalElectrochemistryInstruments & InstrumentationSCI(E)EICPCI-S(ISTP)
Risks of Offline Verify PIN on Contactless Cards
No full textContactless card payments are being introduced around the world al- lowing customers to use a card to pay for small purchases by simply placing the card onto the Point of Sale terminal. Contactless transactions do not require veri- fication of the cardholder’s PIN. However our research has found the redundant verify PIN functionality is present on the most commonly issued contactless credit and debit cards currently in circulation in the UK. This paper presents a plausible attack scenario which exploits contactless verify PIN to give unlimited attempts to guess the cardholder’s PIN without their knowledge. It also gives experimental data to demonstrate the practical viability of the attack as well as references to support our argument that contactless verify PIN is redundant functionality which compromises the security of payment cards and the cardholder
Base de données des effets mécaniques de la RSI du béton
No full textPoint sur les travaux menés par le laboratoire EMMS sur les réactions de gonflement interne
ICPRAM 2012 International Conference on Pattern Recognition Application and Methods
No full textContinuing a line of work initiated in (Boyer et al., 2007), a generalisation of stochastic string distance to a stochastic tree distance is considered. Hitheto overlooked modifications to the Zhang/Shasha tree-distance algorithm for all-paths and viterbi variants of this stochastic tree distance are described. A strategy towards an EM cost-adaptation algorithm for the all-paths distance which was suggested by (Boyer
et al., 2007) is shown to overlook necessary ancestry preservation constraints, and an alternative EM cost-adaptation algorithm for the Viterbi variant is proposed. Experiments are reported on in which a distance-weighted kNN categorisation algorithm is applied to a corpus of categorised tree structures. We show that a 67.7% base-line using standard unit-costs can be improved to 72.5% by the EM cost adaptation algorithm
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