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See detailCluster expansion method for evolving weighted networks having vector-like nodes
Ausloos, Marcel ULg; Gligor, M.

in Acta Physica Polonica A (2008), 114(3), 491-499

The cluster variation method known in statistical mechanics and condensed matter is revived for weighted bipartite networks. The decomposition (or expansion) of a Hamiltonian through a finite number of ... [more ▼]

The cluster variation method known in statistical mechanics and condensed matter is revived for weighted bipartite networks. The decomposition (or expansion) of a Hamiltonian through a finite number of components, whence serving to define variable clusters, is recalled. As an illustration the network built from data representing correlations between (4) macroeconomic features, i.e. the so-called vector components, of 15 EU countries, as (function) nodes, is discussed. We show that statistical physics principles, like the maximum entropy criterion points to clusters, here in a (4) variable phase space: Gross Domestic Product, Final Consumption Expenditure, Gross Capital Formation and Net Exports. It is observed that the maximum, entropy corresponds to a cluster which does not explicitly include the Gross Domestic Product but only the other (3) "axes", i.e. consumption, investment and trade components. On the other hand, the minimal entropy clustering scheme is obtained from a coupling necessarily including Gross Domestic Product and Final Consumption Expenditure. The results confirm intuitive economic theory and practice expectations at least as regards geographical connexions. The technique can of course be applied to many other cases in the physics of socio-economy networks. [less ▲]

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See detailCluster Headaches--Central or Peripheral in Origin?
Schoenen, Jean ULg

in Lancet (1998), 352(9124), 253-5

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See detailClustered organization of homologous KRAB zinc-finger genes with enhanced expression in human T lymphoid cells
Bellefroid, Eric J.; Marine, Jean-Christophe; Ried, Thomas et al

in EMBO Journal (1993), 12(4), 1363-1374

KRAB zinc-finger proteins (KRAB-ZFPs) constitute a large subfamily of ZFPs of the Krüppel C2H2 type. KRAB (Krüppel-associated box) is an evolutionarily conserved protein domain found N-terminally with ... [more ▼]

KRAB zinc-finger proteins (KRAB-ZFPs) constitute a large subfamily of ZFPs of the Krüppel C2H2 type. KRAB (Krüppel-associated box) is an evolutionarily conserved protein domain found N-terminally with respect to the finger repeats. We report here the characterization of a particular subgroup of highly related human KRAB-ZFPs. ZNF91 is one representative of this subgroup and contains 35 contiguous finger repeats at its C-terminus. Three mRNA isoforms with sequence identity to ZNF91 were isolated by the polymerase chain reaction. These encode proteins with a KRAB domain present, partially deleted or absent. Five genomic fragments were characterized, each encoding part of a gene: the ZNF91 gene or one of four distinct, related KRAB-ZFP genes. All exhibit a common exon/intron organization with the variant zinc finger repeats organized in a single exon and the KRAB domain encoded by two separate exons. This positioning of introns supports the hypothesis that the mRNA isoforms encoding polypeptides with variability in the KRAB domain could arise by alternative splicing. By in situ chromosomal mapping studies and by analysis of fragments from a human genomic yeast artificial chromosome library containing KRAB-ZFP genes, we show that these genes occur in clusters; in particular, a gene complex containing over 40 genes has been identified in chromosomal region 19p12-p13.1. These ZNF91-related genes probably arose late during evolution since no homologous genes are detected in the mouse and rat genomes. Although the transcription of members of this KRAB-ZFP gene subgroup is detectable in all human tissues, their expression is significantly higher in human T lymphoid cells. [less ▲]

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See detailClustering behaviors in networks of integrate-and-fire oscillators
Mauroy, Alexandre ULg; Sepulchre, Rodolphe ULg

in Chaos (2008), 18

Clustering behavior is studied in a model of integrate-and-fire oscillators with excitatory pulse coupling. When considering a population of identical oscillators, the main result is a proof of global ... [more ▼]

Clustering behavior is studied in a model of integrate-and-fire oscillators with excitatory pulse coupling. When considering a population of identical oscillators, the main result is a proof of global convergence to a phase-locked clustered behavior. The robustness of this clustering behavior is then investigated in a population of nonidentical oscillators by studying the transition from total clustering to the absence of clustering as the group coherence decreases. A robust intermediate situation of partial clustering, characterized by few oscillators traveling among nearly phase-locked clusters, is of particular interest. The analysis complements earlier studies of synchronization in a closely related model. [less ▲]

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See detailClustering of Crohn’s disease patients: Identification of sub-phenotypes and population stratification
Maus, Bärbel ULg; Génin, Emmanuelle; Mahachie John, Jestinah ULg et al

in Genetic Epidemiology (2012), 36(7), 729

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See detailClustering of gangliosides in phospholipid bilayers.
Delmelle, Michel ULg; Dufrane, S. P.; Brasseur, Robert ULg et al

in FEBS Letters (1980), 121(1), 11-4

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See detailClustering-Based Anomaly Detection in Multi-View Data
Marcos Alvarez, Alejandro ULg; Yamada, Makoto; Kimura, Akisato et al

in Proceedings of the 22nd International Conference on Information and Knowledge Management (2013, October)

This paper proposes a simple yet effective anomaly detection method for multi-view data. The proposed approach detects anomalies by comparing the neighborhoods in different views. Specifically, clustering ... [more ▼]

This paper proposes a simple yet effective anomaly detection method for multi-view data. The proposed approach detects anomalies by comparing the neighborhoods in different views. Specifically, clustering is performed separately in the different views and affinity vectors are derived for each object from the clustering results. Then, the anomalies are detected by comparing affinity vectors in the multiple views. An advantage of the proposed method over existing methods is that the tuning parameters can be determined effectively from the given data. Through experiments on synthetic and benchmark datasets, we show that the proposed method outperforms existing methods. [less ▲]

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See detailClusters formation in Eisenia fetida (Oligochaeta, Lumbricidae)
Zirbes, Lara ULg; Deneubourg, Jean-Louis; Brostaux, Yves ULg et al

in 17th Benelux Congress of Zoology Classic Biology in Modern Times (2010)

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See detailClusters in weighted macroeconomic networks: the EU case. Introducing the overlapping index of GDP/capita fluctuation correlations
Gligor, M.; Ausloos, Marcel ULg

in European Physical Journal B -- Condensed Matter (2008), 63(4), 533-539

GDP/capita correlations are investigated in various time windows (TW), for the time interval 1990-2005. The target group of countries is the set of 25 EU members, 15 till 2004 plus the 10 countries which ... [more ▼]

GDP/capita correlations are investigated in various time windows (TW), for the time interval 1990-2005. The target group of countries is the set of 25 EU members, 15 till 2004 plus the 10 countries which joined EU later on. The TW-means of the statistical correlation coefficients are taken as the weights (links) of a fully connected network having the countries as nodes. Thereafter we de. ne and introduce the overlapping index of weighted network nodes. A cluster structure of EU countries is derived from the statistically relevant eigenvalues and eigenvectors of the adjacency matrix. This may be considered to yield some information about the structure, stability and evolution of the EU country clusters in a macroeconomic sense. [less ▲]

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See detailClusters of galaxies -- W. V. Oegerle et al.
Manfroid, Jean ULg

in Ciel et Terre (1990), 106

Not Available

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See detailClusters or networks of economies? A macroeconomy study through gross domestic product
Ausloos, Marcel ULg; Lambiotte, R.

in Physica A-Statistical Mechanics and its Applications (2007), 382(1), 16-21

We study correlations between web-downloaded gross domestic product (GDP)'s of rich countries. GDP is used as wealth signatures of the country economical state. We calculate the yearly fluctuations of the ... [more ▼]

We study correlations between web-downloaded gross domestic product (GDP)'s of rich countries. GDP is used as wealth signatures of the country economical state. We calculate the yearly fluctuations of the GDP. We look for forward and backward correlations between such fluctuations. The correlation measure is based on the Theil index. The system is represented by an evolving weighted network, nodes being the GDP fluctuations (or countries) at different times. In order to extract structures from the network, we focus on filtering the time delayed correlations by removing the least correlated links. This percolation idea-based method reveals the emergence of connections, that are visualized by a branching representation. Note that the network is made of weighted and directed links when taking into account a delay time. Such a measure of collective habits does not readily fit the usual expectations, except if an economy globalization framework is accepted. (C) 2007 Published by Elsevier B.V. [less ▲]

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See detailThe CMC-like behaviour of bile salts as probed by photoexcited Rose Bengal
Seret, Alain ULg; Bahri, Mohamed Ali ULg

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2009), 339

The onset of the aggregation process in aqueous bile salt (BS) solutions remains a debated question. This study aimed at investigating this point through the detection of BS monomers and small aggregates ... [more ▼]

The onset of the aggregation process in aqueous bile salt (BS) solutions remains a debated question. This study aimed at investigating this point through the detection of BS monomers and small aggregates using the dye Rose Bengal. Results showed that a few small BS aggregates led to a red shift of the absorption spectrum, while the BS monomer reacted with the photo-induced semi-oxidized dye and decreased its decay rate constant. The dye was dissolved in aqueous solution (10 mmol dm-3 NaOH) of sodium cholate (NaC), deoxycholate (NaDC), chenodoxycholate (NaCDC), dehydrocholate (NaDHC), glycocholate (NaGC) glycodeoxycholate (NaGDC), taurocholate (NaTC), taurodeoxycholate (NaTDC) and the zwitterionic analogue of sodium cholate called CHAPS. BS aggregates were detected at concentrations well below the concentration above which any added bile salt molecules participate in the aggregation process for all trihydroxy bile salts and for CHAPS but not for the dihydroxy bile salts. No aggregation of NaDHC could be observed in the studied concentration range (≤ 10 mmol dm-3). The presence of 150 and 600 mmol dm-3 sodium ions lowered the concentration below which BS are mainly monomers for dihydroxy but not for trihydroxy bile salts. As already proposed by others, the use of the concept of Micellar Dissociation Concentration (MDC) is suggested here instead of the classical Critical Micelle Concentration (CMC). [less ▲]

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See detailCMOS-APS Detectors for Solar Physics: Lessons Learned during the SWAP Preflight Calibration
De Groof, Anik; Berghmans, David; Nicula, Bogdan et al

in Solar Physics (2008)

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See detailThe CN isotopic ratios in comets
Manfroid, Jean ULg; Jehin, Emmanuel ULg; Hutsemekers, Damien ULg et al

in Astronomy and Astrophysics (2009), 503

Our aim is to determine the isotopic ratios [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N in a variety of comets and link these measurements to the formation and evolution of the solar ... [more ▼]

Our aim is to determine the isotopic ratios [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N in a variety of comets and link these measurements to the formation and evolution of the solar system. The [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N isotopic ratios are measured for the CN radical by means of high-resolution optical spectra of the R branch of the B-X (0, 0) violet band. 23 comets from different dynamical classes have been observed, sometimes at various heliocentric and nucleocentric distances, in order to estimate possible variations of the isotopic ratios in parent molecules. The [SUP]12[/SUP]C/[SUP]13[/SUP]C and [SUP]14[/SUP]N/[SUP]15[/SUP]N isotopic ratios in CN are remarkably constant (average values of, respectively, 91.0 ± 3.6 and 147.8 ± 5.7) within our measurement errors, for all comets whatever their origin or heliocentric distance. While the carbon isotopic ratio does agree with the terrestrial value (89), the nitrogen ratio is a factor of two lower than the terrestrial value (272), indicating a fractionation in the early solar system, or in the protosolar nebula, common to all the comets of our sample. This points towards a common origin of the comets independently of their birthplaces, and a relationship between HCN and CN. Appendices and Table [see full textsee full textsee full text] are only available in electronic form at http://www.aanda.org Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programmes ID 268.C-5570, 270.C-5043, 073.C-0525, 274.C-5015 and 075.C-0355(A). [less ▲]

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See detailCn. Octavius (cos. 165) dans un nouveau sénatus-consulte découvert à Volos ?
Famerie, Etienne ULg

Scientific conference (2012, April 04)

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See detailCn. Octavius (cos. 165) dans un nouveau sénatus-consulte découvert à Volos ?
Famerie, Etienne ULg

in Chiron. Mitteilungen der Kommission für Alte Geschichte und Epigraphik des Deutschen Archäologischen Instituts (2013), 43

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See detailCNMNC guidelines for the use of suffixes and prefixes in mineral nomenclature, and for the preservation of historical names.
Hatert, Frédéric ULg; Mills, Stuart; Pasero, Marco et al

in European Journal of Mineralogy (2013), 25

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