By using totally isotropic subspaces in an orthogonal space Ä+(2i, 2), several infinite families of packings of 2k -dimensional subspaces of real 2i -dimensional space are constructed, some of which are shown to be optimal packings. A certain Clifford group underlies the construction and links this problem with Barnes-Wall lattices, Kerdock sets and quantum-error-correcting codes.

Cointegration among interest rates for instruments with different maturities has been widely tested with mixed results. This paper proposes an extension to the Engle-Granger testing strategy by permitting asymmetry in the adjustment toward equilibrium in two different ways. We demonstrate that our test has good power and size properties over the Engle-Granger test when there are asymmetric depa...

A method for blind estimation of DET curves for speaker verification systems is proposed. Verification error probabilities are estimated on a database where speaker identities are unknown. The database must provide a set of impostor-only tests as well as a set of mixed impostor and target tests. This method is tested on 9 speaker verification systems that were scored on the NIST 2000 database. ...

The intention of this paper is to examine the impact of the inflation rate on the performance of the Egyptian stock market. Particular attention is paid to the effects of the rate of inflation on various stock market performance variables, in terms of market activity and market liquidity. From the co-integration analysis through error correction mechanisms Ž . ECM , significant long-run and sho...

Instead of modeling asset price and currency risks separately, this paper derives the international hedge portfolio, hedging asset price and currency risk simultaneously for estimating the dynamic international optimal hedge ratio. The model estimation is specified in a multivariate GARCH setting with vector error correction terms and estimated for the commodity and stock markets of the U.S., t...

The results of a detailed study of errors in a musical database are presented. It is shown that the form of analytic processing employed may substantially magnify the effect of database errors so that very small error rates can produce very large errors in the analytic results. An equation is devised to assist in estimating the effect of an overall error-rate on arbitrary analytic measures deri...

J. Echanobe Dpto. Matemática e Informática Univ. Pública de Navarra Campus de Arrosad́ıa 31006 Pamplona, Spain [email protected] J. R. Garitagoitia Dpto. Matemática e Informática Univ. Pública de Navarra Campus de Arrosad́ıa 31006 Pamplona, Spain [email protected] J. R. González de Mend́ıvil Dpto. Automática y Computación Univ. Pública de Navarra Campus de Arrosad́ıa 31006 Pamplona, Spain mend...

Although TCP and UDP application performance over wireless links may be substantially improved via link layer error recovery, different schemes are appropriate for each application class. We present a multi-service link layer architecture that simultaneously enhances the performance of diverse applications by supporting multiple error recovery mechanisms in parallel. We simulated concurrent fil...

Engineers seek to reduce the cost of solar-thermal central tower systems by reducing the cost of the heliostat field. Lower-cost heliostats can be achieved by accepting lower precision in manufacture and installation. Automated alignment methods can then be used to correct pointing errors due to misalignments after the heliostat is installed, to obtain and maintain the required pointing accurac...

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