Résumé. La notion de règles entre attributs est très générale, allant des règles d’association en fouille de données aux dépendances fonctionnelles (DF) en bases de données. Malgré cette diversité, la syntaxe des règles est toujours la même, seule leur sémantique diffère. Pour une sémantique donnée, en fonction des propriétés induites, des techniques algorithmiques sont mises en oeuvre pour déc...

For a set G and a family of sets F let DF (G) = {F ∈ F : F ∩ G = ∅} and SF (G) = {F ∈ F : F ⊆ G or G ⊆ F}. We say that a family is l-almost intersecting, (≤ l)-almost intersecting, l-almost Sperner, (≤ l)-almost Sperner if |DF (F )| = l, |DF (F )| ≤ l, |SF (F )| = l, |SF (F )| ≤ l (respectively) for all F ∈ F . We consider the problem of finding the largest possible family for each of the above...

KARINA I. MAZZITELLO, CONSTANCIO M. ARIZMENDI∗, ALVARO L. SALAS BRITO† and HILARY G. E. HENTSCHEL‡ CONICET-Facultad de Ingenieŕıa, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, B7608FDQ Mar del Plata, Argentina ∗Facultad de Ingenieŕıa, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, B7608FDQ Mar del Plata, Argentina †Univ Autonoma Metropolitana Azcapotzalco, Lab Sistemas...

This paper revisits a model for elliptic curves over Q introduced by Huff in 1948 to study a diophantine problem. Huff’s model readily extends over fields of odd characteristic. Every elliptic curve over such a field and containing a copy of Z/4Z× Z/2Z is birationally equivalent to a Huff curve over the original field. This paper extends and generalizes Huff’s model. It presents fast explicit f...

Digital data collected from each element of a L-shaped wide-aperture HF radar aperture can be examined offline with various beamforming and direction finding algorithms to assess statistical characteristics of received signals. This paper examines data on radio sources propagating to the HF radar via refraction off the ionosphere. The variations of the spatial properties of radio sources are ex...

Over the last fifty years, How to Lie with Statistics has sold more copies than any other statistical text. This note explores the factors that contributed to its success and provides biographical sketches of its creators: author Darrell Huff and illustrator Irving Geis.

1 Universidad Autónoma del Estado de México Unidad Académica Profesional Tianguistenco Instituto Literario #100, Col. Centro, Toluca, 50000, Estado de México [email protected], [email protected], [email protected] 2 Laboratorio de Lenguaje Natural y Procesamiento de Texto, Centro de Investigación en Computación, Instituto Politécnico Nacional, DF 07738, México sidorov@ci...

A new pseudo-noise resampling technique is proposed to mitigate the effect of outliers in Unitary ESPRIT. This scheme improves the performance of Unitary ESPRIT in unreliable situations, where the so-called reliability test has a failure. For this purpose, we exploit a pseudo-noise resampling of a failed Unitary ESPRIT estimator with a censored selection of “successful” resamplings recovering t...

In this paper, noncoherent receivers for differential space–time modulation (DSTM) are investigated. It is shown that the performance of the previously proposed conventional differential detection (DD) receiver is satisfactory only for very slow flat fading channels. However, conventional DD suffers from a considerable loss in performance even for moderately fast fading. In order to overcome th...