OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Christophe” ,找到相关结果约4172条。
How to Value GDP-Linked Collar Bonds? An Introductory Perspective  [PDF]
Christophe Schinckus
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.33024

This short paper proposed a pricing method for GDP-linked collar bonds based on the classical discounted pricing model and the assumption that the GDP can be described with a geometric Brownian motion. The estimation of parameters was not discussed because it is not central in our numerical exercise.

Automated Colorization of Grayscale Images Using Texture Descriptors and a Modified Fuzzy C-Means Clustering  [PDF]
Christophe Gauge, Sreela Sasi
Journal of Intelligent Learning Systems and Applications (JILSA) , 2012, DOI: 10.4236/jilsa.2012.42013
Abstract: A novel example-based process for Automated Colorization of grayscale images using Texture Descriptors (ACTD) without any human intervention is proposed. By analyzing a set of sample color images, coherent regions of homogeneous textures are extracted. A multi-channel filtering technique is used for texture-based image segmentation, combined with a modified Fuzzy C-means (FCM) clustering algorithm. This modified FCM clustering algorithm includes both the local spatial information from neighboring pixels, and the spatial Euclidian distance to the cluster’s center of gravity. For each area of interest, state-of-the-art texture descriptors are then computed and stored, along with corresponding color information. These texture descriptors and the color information are used for colorization of a grayscale image with similar textures. Given a grayscale image to be colorized, the segmentation and feature extraction processes are repeated. The texture descriptors are used to perform Content-Based Image Retrieval (CBIR). The colorization process is performed by Chroma replacement. This research finds numerous applications, ranging from classic film restoration and enhancement, to adding valuable information into medical and satellite imaging. Also, this can be used to enhance the detection of objects from x-ray images at the airports.
Novel Epistemic and Predictive Heuristic for Semantic and Dynamic Social Networks Analysis  [PDF]
Christophe Thovex, Francky Trichet
Social Networking (SN) , 2014, DOI: 10.4236/sn.2014.33021

Using Kripke semantics, we have identified and reduced an epistemic incompleteness in the metaphor commonly employed in Social Networks Analysis (SNA), which basically compares information flows with current flows in advanced centrality measures. Our theoretical approach defines a new paradigm for the semantic and dynamic analysis of social networks including shared content. Based on our theoretical findings, we define a semantic and predictive model of dynamic SNA for Enterprises Social Networks (ESN), and experiment it on a real dataset.

La question locale comme nouvelle frontière socio-spatiale
Christophe Gibout,Christophe Mauny
SociologieS , 2009,
Abstract: Partant de l’objet football socialement reconnu et de deux formes de pratique préalablement identifiées – pratiques fédérale et de pied d’immeuble – notre travail interroge l’influence et l’importance de la localisation dans la définition formelle des pratiques et la compréhension de leurs logiques identitaires. Parce que les pratiquants déploient des arts de faire singuliers sur un territoire jouant le r le de lien et de liant, notre enquête montre que la dichotomie rural/urbain ne semble plus aujourd’hui heuristiquement pertinente pour comprendre le construit de la pratique sportive. Dès lors émerge la question locale – celle du chez soi – comme élément central de la construction sociale de la pratique sportive ; en témoigne la réalité d’une autre forme de football, non exclusive des deux autres : le football sauvage . The local question as a new socio-spatial frontierBeyond opposition between urban and rural soccer: the “at home” oneOn the basis of socially recognized football and of two beforehand identified forms of practice – official soccer and football played at the foot of one's building – our work questions the influence and the importance of the localization in the definition of the practices and in the comprehension of their identity logics. Because of the players use second hand habits on a territory playing the part of bond and binder, our investigation shows that the rural/urban dichotomy doesn’t seem any more relevant today to understand the construction of sport’s practice. Consequently emerges the local question – the one of at home – as central element of the social construction of the sport’s practice as testified to the reality of another form of football, nonexclusive of both others: wild football. Lo local como nueva frontera socio-espacialMas allá de la oposición entre el futbol urbano y el futbol rural: “nuestro” futbolA partir del futbol, en tanto que objeto social objetivado, y de dos maneras de jugar, la practica institucionalizada por los clubes por una parte y por otro lado la practica callejera, el artículo se plantea la influencia y la importancia de la localización espacial en la definición puramente formal de la practica futbolística y la comprensión de las lógicas identitaria respectivas. Los jugadores desplegan diferentes formas singulares de jugar dentro de un espacio, y asumen implícitamente el doble papel de lazo y de aglutinante social. El artículo demuestra que la división entre lo rural y lo urbano no es hoy día eficaz desde el punto de vista heurística para explicar lo que hay de pert
Pauvreté et droits humains (Poverty and Human Rights)
Christophe Gironde,Christophe Golay
Ceriscope , 2012,
Abstract: Depuis les années 1980, les questions de droits humains, notamment économiques, sociaux et culturels, se sont progressivement imposées dans l'étude des causes de la pauvreté et des mesures qui permettraient de la réduire. Pourtant, force est de constater que les cas de non-respect, dénis et violations des droits humains n'ont pas sensiblement diminué. Les abus entra nés par le phénomène des acquisitions massives de terres agricoles dans les pays les plus pauvres de la planète en fournissent une bonne illustration. Dans ce contexte, les limites des principes volontaires sautent aux yeux, mais la revendication et la protection d'un droit contraignant, tel le droit à l'alimentation, offre des opportunités plus intéressantes pour les communautés locales et les acteurs qui les soutiennent.(Human rights, particularly economic, social and cultural rights, have, since the 1980s, assumed an important part in the study of the causes of poverty and methods used to reduce it. Nevertheless, there has not been a noticeable decline in human rights abuses. One example is the massive agricultural land grabs in the poorest nations of the world. It is clear that voluntary principles are insufficient. However, imposition of a right to food offers an opportunity for local communities and their supporters).
The Production of CNT Flower-Like Structures with 3-Fold and 4-Fold Symmetries on a Pt/Si Substrate  [PDF]
Madjid Arab, Marjorie David, Jean-Christophe Valmalette, Christophe Ramseyer
Advances in Chemical Engineering and Science (ACES) , 2013, DOI: 10.4236/aces.2013.31009

Carbon nanotubes flower (CNTs-F) films were prepared by catalytic chemical vapor deposition (CVD) on a platinum (Pt) thin layer, supported on a silicon wafer. The products were synthesized from an aerosol composed of ferrocene and toluene, as catalyst and carbon precursor respectively, at 820\"\". The high synthesis temperature induces a modification of a Pt thin layer to a nano-structured island giving rise to the formation of CNTs-F during the following films growth step by CVD process. The suggested mechanism involves the selective diffusion of the catalyst and carbon atoms through the Pt grain boundaries. This results in the appearance of flower-like structures with 3-and 4-fold symmetries.

Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background
Christophe Ringeval
Advances in Astronomy , 2010, DOI: 10.1155/2010/380507
Abstract: Motivated by the fact that cosmological perturbations of inflationary quantum origin were born Gaussian, the search for non-Gaussianities in the cosmic microwave background (CMB) anisotropies is considered as the privileged probe of nonlinear physics in the early universe. Cosmic strings are active sources of gravitational perturbations and incessantly produce non-Gaussian distortions in the CMB. Even if, on the currently observed angular scales, they can only contribute a small fraction of the CMB angular power spectrum, cosmic strings could actually be the main source of its non-Gaussianities. In this paper, after having reviewed the basic cosmological properties of a string network, we present the signatures Nambu-Goto cosmic strings would induce in various observables ranging from the one-point function of the temperature anisotropies to the bispectrum and trispectrum. It is shown that string imprints are significantly different than those expected from the primordial type of non-Gaussianity and could therefore be easily distinguished.
Adaptive Wavelet Estimation of a Biased Density for Strongly Mixing Sequences
Christophe Chesneau
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/604150
Abstract: The estimation of a biased density for exponentially strongly mixing sequences is investigated. We construct a new adaptive wavelet estimator based on a hard thresholding rule. We determine a sharp upper bound of the associated mean integrated square error for a wide class of functions.
Goniothalamus Species: A Source of Drugs for the Treatment of Cancers and Bacterial Infections?
Christophe Wiart
Evidence-Based Complementary and Alternative Medicine , 2007, DOI: 10.1093/ecam/nem009
Abstract: Irrespective of the presence of cytotoxic acetogenins and styryl-lactones in the genus Goniothalamus, only 22 species in the genus Goniothalamus, out of 160 species (13.7%) have so far been investigated. In an effort to promote further research on the genus Goniothalamus which could represent a source of drugs for the treatment of cancers and bacterial infections, this work offers a broad analysis of current knowledge on Goniothalamus species. Therefore, it includes (i) taxonomy (ii) botanical description (iii) traditional medicinal uses and (iv) phytochemical and pharmacological studies. We discuss the molecular mechanisms of actions of acetogenins and styryl-lactones, with some emphasis on the possible involvement of protein kinase, Bax and TRAIL receptors in the cytotoxic effects of styryl-lactones. We also report (v) the growth inhibition of several nosocomial bacteria by Goniothalamus. scortechinii. The crude methanol extract of G. scortechinii showed a good and broad spectrum of antibacterial activity against both Gram-negative and Gram-positive bacteria.
Estimating Individual and Household Reproduction Numbers in an Emerging Epidemic
Christophe Fraser
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000758
Abstract: Reproduction numbers, defined as averages of the number of people infected by a typical case, play a central role in tracking infectious disease outbreaks. The aim of this paper is to develop methods for estimating reproduction numbers which are simple enough that they could be applied with limited data or in real time during an outbreak. I present a new estimator for the individual reproduction number, which describes the state of the epidemic at a point in time rather than tracking individuals over time, and discuss some potential benefits. Then, to capture more of the detail that micro-simulations have shown is important in outbreak dynamics, I analyse a model of transmission within and between households, and develop a method to estimate the household reproduction number, defined as the number of households infected by each infected household. This method is validated by numerical simulations of the spread of influenza and measles using historical data, and estimates are obtained for would-be emerging epidemics of these viruses. I argue that the household reproduction number is useful in assessing the impact of measures that target the household for isolation, quarantine, vaccination or prophylactic treatment, and measures such as social distancing and school or workplace closures which limit between-household transmission, all of which play a key role in current thinking on future infectious disease mitigation.

Copyright © 2008-2017 Open Access Library. All rights reserved.