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See detailEntropie et anthropisation des paysages : interprétations, usages, interrelations
Vranken, Isabelle ULg

Scientific conference (2012, November 07)

La notion d'entropie en écologie du paysage est fréquemment utilisée, notamment pour caractériser l'effet des perturbations anthropiques. Or il s'avère que ce concept puisse y prendre des sens multiples ... [more ▼]

La notion d'entropie en écologie du paysage est fréquemment utilisée, notamment pour caractériser l'effet des perturbations anthropiques. Or il s'avère que ce concept puisse y prendre des sens multiples et parfois contradictoires, notamment en ce qui concerne le lien entre entropie thermodynamique et hétérogénéité spatiale du paysage. Ce séminaire présente les différentes interprétations de l'entropie en écologie du paysage et dans d'autres disciplines, puis tente d'établir des liens entre elles, plus particulièrement avec la thermodynamique. En outre, un lien entre l'entropie (hétérogénéité spatiale, puis thermodynamique) et l'anthropisation est établi à l'aide d'indices de structure spatiale (Simpson, LPI, U) appliqués à une population de 16 paysages africains. Il en ressort que l'effet anthropique a tendance à augmenter l'hétérogénéité spatiale du paysage pour atteindre un optimum à l'équilibre entre classes anthropiques et naturelles et ensuite diminuer. L'étude des liens entre hétérogénéité spatiale et thermodynamique montre qu'en l'état actuel des connaissances, il n'est pas pertinent d'établir un lien unilatéral entre ces deux champs d'observation. [less ▲]

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See detailAn entropy based technique for information embedding in images
Van Droogenbroeck, Marc ULg; Delvaux, Jérôme

in IEEE Signal Processing Symposium, Proceedings (2002, March)

Many information hiding techniques have recently been analyzed as they could help manage part of the digital rights. Among the general framework of information hiding, the focus has been put on ... [more ▼]

Many information hiding techniques have recently been analyzed as they could help manage part of the digital rights. Among the general framework of information hiding, the focus has been put on steganography and on watermarking techniques. This paper proposes an entropy based technique for data embedding in images with a specific target, sometimes referred to as feature location: inclusion of a maximum amount of information instead of robustness against attacks. After an introduction, we analyze the error that results from a modification of the least significant bits. Then we describe our embedding technique. Finally we examine the upper bound of information that can be embedded in the least significant bits by means of our technique and we conclude. [less ▲]

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See detailENTROPY CORRELATION DISTANCE METHOD APPLIED TO STUDY CORRELATIONS BETWEEN THE GROSS DOMESTIC PRODUCT OF RICH COUNTRIES
Ausloos, Marcel ULg; Miskiewicz, J.

in International Journal of Bifurcation & Chaos in Applied Sciences & Engineering (2010), 20(2), 381-389

The Theil index is much used in economy and finance; it looks like the Shannon entropy, but pertains to event values rather than to their probabilities. Any time series can be remapped through the Theil ... [more ▼]

The Theil index is much used in economy and finance; it looks like the Shannon entropy, but pertains to event values rather than to their probabilities. Any time series can be remapped through the Theil index. Correlation coefficients can be evaluated between the new time series, thereby allowing to study their mutual statistical distance - to be contrasted to the usual correlation distance measure for the primary time series. As an example this entropy-like correlation distance method (ECDM) is applied to the Gross Domestic Product of 20 rich countries in order to test some economy globalization process. Hierarchical distances allow to construct (i) a linear network, (ii) a Locally Minimal Spanning Tree. The role of time averaging in finite size windows is illustrated and discussed. It is also shown that the mean distance between the most developed countries, was decreasing since 1960 till 2000, which we consider to be a proof of globalization of the economy for these countries. [less ▲]

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See detailEntropy increase of fragmented habitats: a sign of human impact?
Bogaert, Jan ULg; Farina, A; Ceulemans, R

in Ecological Indicators (2005), 5(3), 207-212

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See detailEntropy of entanglement and multifractal exponents for random states
Giraud, O.; Martin, John ULg; Georgeot, B.

in Physical Review. A (2009), 79

We relate the entropy of entanglement of ensembles of random vectors to their generalized fractal dimensions. Expanding the von Neumann entropy around its maximum we show that the first order only depends ... [more ▼]

We relate the entropy of entanglement of ensembles of random vectors to their generalized fractal dimensions. Expanding the von Neumann entropy around its maximum we show that the first order only depends on the participation ratio, while higher orders involve other multifractal exponents. These results can be applied to entanglement behavior near the Anderson transition. [less ▲]

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See detailEntropy-based knowledge spreading and application to mobility prediction
François, Jean-Marc; Leduc, Guy ULg

in ACM International conference on Emerging Network Experiments and Technologies (2005, October)

The low quality of service provided by wireless networks does not facilitate the setup of long-awaited services, such as video conversations. In a cellular network, handoffs are an important cause of ... [more ▼]

The low quality of service provided by wireless networks does not facilitate the setup of long-awaited services, such as video conversations. In a cellular network, handoffs are an important cause of packet losses and delay jitter. These problems can be mitigated if proactive measures are taken. This requires each cell to guess the next handoff of each mobile terminal, a problem known as mobility prediction. This prediction can occur thanks to some clues (such as signal strength measurements) giving information about the terminals motion. For example, a clue that locates on which road a mobile is moving is likely to be interesting for all the prediction-enabled cells along that road ---and should therefore be sent to them. This paper proposes a new method aimed at selecting the most relevant clues and finding where to propagate those clues so as to optimize mobility predictions. The pertinence of a clue is measured using information theory and by means of decision trees. This pertinence estimation is exchanged between the cells and allows to build a"relevance map" that helps determine where clues should be sent. It is adapted to the characteristics of wireless terminals such as low bandwidth and processing power. [less ▲]

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See detailEntwicklung der Kritizismus in der deutschen Philosophie des 19.-20. Jahrhunderts
Dewalque, Arnaud ULg

E-print/Working paper (2008)

Tableau synoptique du mouvement criticiste et des différentes écoles qui le composent.

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See detailDie Entwicklung der Verfassungsgerichtsbarkeit in Belgien
Behrendt, Christian ULg

Conference (2011, March 18)

Exposé sur le fonctionnement et l'évolution de la justice constitutionnelle en Belgique, donné dans le cadre du work-shop fermé organisé par l'Institut Max-Planck de droit international public et de droit ... [more ▼]

Exposé sur le fonctionnement et l'évolution de la justice constitutionnelle en Belgique, donné dans le cadre du work-shop fermé organisé par l'Institut Max-Planck de droit international public et de droit public étranger à Heidelberg (Max-Planck-Institut für ausländisches öffentliches Recht und Völkerrecht) [less ▲]

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See detailEnucleation of a giant hepatic hemangioma in a Jehovah's Witness
Detry, Olivier ULg; Honore, Pierre ULg; Joris, Jean ULg et al

in Acta Chirurgica Belgica (2002), 102(1), 54-56

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See detailEnumeration and decidable properties of automatic sequences
Charlier, Emilie ULg; Rampersad, Narad; Shallit, Jeffrey

in International Journal of Foundations of Computer Science (2012), 23(5), 1035-1066

We show that various aspects of k-automatic sequences — such as having an unbordered factor of length n — are both decidable and effectively enumerable. As a consequence it follows that many related ... [more ▼]

We show that various aspects of k-automatic sequences — such as having an unbordered factor of length n — are both decidable and effectively enumerable. As a consequence it follows that many related sequences are either k-automatic or k-regular. These include many sequences previously studied in the literature, such as the recurrence function, the appearance function, and the repetitivity index. We also give some new characterizations of the class of k-regular sequences. Many results extend to other sequences defined in terms of Pisot numeration systems. [less ▲]

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See detailEnumeration and decidable properties of automatic sequences
Charlier, Emilie ULg; Rampersad, Narad; Shallit, Jeffrey

in Actes de Numération 2011 (2011, June)

We show that various aspects of k-automatic sequences such as having an unbordered factor of length n are both decidable and e ectively enumerable. As a consequence it follows that many related sequences ... [more ▼]

We show that various aspects of k-automatic sequences such as having an unbordered factor of length n are both decidable and e ectively enumerable. As a consequence it follows that many related sequences are either k-automatic or k-regular. These include many sequences previously studied in the literature, such as the recurrence function, the appearance function, and the repetitivity index. We also give a new characterization of the class of k-regular sequences. Many results extend to other sequences de ned in terms of Pisot numeration systems. [less ▲]

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See detailEnumeration and decidable properties of automatic sequences
Charlier, Emilie ULg

Conference (2011, July)

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See detailEnumeration and decidable properties of automatic sequences
Charlier, Emilie ULg; Rampersad, Narad; Shallit, Jeffrey

in Lecture Notes in Computer Science (2011), 6795

We show that various aspects of k-automatic sequences — such as having an unbordered factor of length n — are both decidable and effectively enumerable. As a consequence it follows that many related ... [more ▼]

We show that various aspects of k-automatic sequences — such as having an unbordered factor of length n — are both decidable and effectively enumerable. As a consequence it follows that many related sequences are either k-automatic or k-regular. These include many sequences previously studied in the literature, such as the recurrence function, the appearance function, and the repetitivity index. We also give a new characterization of the class of k-regular sequences. Many results extend to other sequences defined in terms of Pisot numeration systems. [less ▲]

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See detailEnunciation vs destination : how a phenomenological point of view on media audiences is also a political one
Servais, Christine ULg

Conference (2013, June 17)

This paper is based on Derrida’s deconstruction of significance, and focuses on how media-based discourses organize the audience in a public space. In audience studies, the text/reader relationship ... [more ▼]

This paper is based on Derrida’s deconstruction of significance, and focuses on how media-based discourses organize the audience in a public space. In audience studies, the text/reader relationship remains a difficult point because it remains unclear how to account for the fact that the media structure perception, although they do not determine it. To solve this contradiction, we need to link together facts and possibilities (empirical and transcendental levels) in a way that keeps alive this relationship between a text and a reader. This is what Jacques Derrida’s work makes possible. We’ll mainly use his concepts of “address” and “destination”. The “address” might be considered as an attempt to translate the linguistic “enunciation” into phenomenological terms: the address modifies reference and thus inscribes the reader in a “world”. As for the “destination”, it refers to a model where communication is indeterminate (“incalculable”). This model gives readers the opportunity to create previously unseen kinds of worlds, or communities of “common sense”. In this way, this model is political. Our analysis allows us to account for both representations of the world and places given to readers in this world, so that we can describe, with this “sharing of the sensory”, mediated experience as political. [less ▲]

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See detailL'énurésie chez l'enfant: actualisation de la compréhension, l'évaluation et le traitement
Battisti, Oreste ULg

Scientific conference (2009, October 25)

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See detailEnvahissement des cuvettes par apports éoliens: processus, impacts et moyens de lutte
Ambouta, Karimou J-M; Tychon, Bernard ULg

in Tropicultura (2008), 26

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See detailL'envasement du lac de Butgenbach (Ardenne, Belgique)
Hallot, Eric ULg; Benoit, Morgan; Stasse, Guillaume et al

in Bulletin de la Société Géographique de Liège (2012), 59

In 2004, the Butgenbach lake reservoir (Warche river) has been emptied for the first time since 1932. The sediments deposited have been studied with a double objective : on the one hand to determine the ... [more ▼]

In 2004, the Butgenbach lake reservoir (Warche river) has been emptied for the first time since 1932. The sediments deposited have been studied with a double objective : on the one hand to determine the volume of sediment deposits, and on the other hand to estimate mean soil erosion rate in the catchment. Some five hundreds manual augerings were made using a thin auger (15 mm) throughout the wet and soft sediments (mud) in order to identify the lake deposits that have overlain the previous soft material (flood silts in the flood plain of the river Warche, silty soils on the slopes). Since the expected boundary between both types of materials could not be identified by the naked eye, a qualitative analysis of diatoms, magnetic susceptibility, grain-size distribution and calcination has been made for fifteen thicker cores (3.6 mm across) taken at representative sites. Mean annual area-specific sediment yield amounts to 28 – 33 t.km-².y-1 [less ▲]

Detailed reference viewed: 63 (17 ULg)