Search results for "computing"

Optical flow estimation from multichannel spherical image decomposition

2011

International audience; The problem of optical flow estimation is largely discussed in computer vision domain for perspective images. It was also proven that, in terms of optical flow analysis from these images, we have difficulty distinguishing between some motion fields obtained with little camera motion. The omnidirectional cameras provided images with large filed of view. These images contain global information about motion and allow to remove the ambiguity present in perspective case. Nevertheless, these images contain significant radial distortions that is necessary to take into account when treating these images to estimate the motion. In this paper, we shall describe new way to comp…

Donor-π-acceptors containing the 10-(1,3-dithiol-2-ylidene)anthracene unit for dye-sensitized solar cells

2012

Two donor-acceptor molecular tweezers incorporating the 10-(1,3-dithiol-2-ylidene)anthracene unit as donor group and two cyanoacrylic units as accepting/anchoring groups are reported as metal-free sensitizers for dye-sensitized solar cells. By changing the phenyl spacer with 3,4-ethylenedioxythiophene (EDOT) units, the absorption spectrum of the sensitizer is red-shifted with a corresponding increase in the molar absorptivity. Density functional calculations confirmed the intramolecular charge-transfer nature of the lowest-energy absorption bands. The new dyes are highly distorted from planarity and are bound to the TiO(2) surface through the two anchoring groups in a unidentate binding for…

Synthesis, Optical, and Morphological Studies of ZnO Powders and Thin Films Fabricated by Wet Chemical Methods

2020

Zinc oxide nanoparticles were prepared from Zn5(CO3)2(OH)6 precursor, capped with poly(vinylpyrrolidone) (PVP), and annealed at 600 &deg

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition.

2013

A study of transmittance and photoluminescence spectra on the growth of oxygen-rich ultra-thin ZnO films prepared by atomic layer deposition is reported. The structural transition from an amorphous to a polycrystalline state is observed upon increasing the thickness. The unusual behavior of the energy gap with thickness reflected by optical properties is attributed to the improvement of the crystalline structure resulting from a decreasing concentration of point defects at the growth of grains. The spectra of UV and visible photoluminescence emissions correspond to transitions near the band-edge and defect-related transitions. Additional emissions were observed from band-tail states near th…

Simple memetic computing structures for global optimization

2014

Influence of soil organic status on the dynamics and impact of copper on microbial communities in a vineyard soil

2009

International audience

A comparative case study of Sony Computer Entertainment's crisis communication efforts during two PlayStation Network crises

2015

This study is about the crisis communication efforts of Sony Computer Entertainment (SCE) during two crises. Their PlayStation Network online service was hacked in 2011 and crashed by artificially high traffic in 2014. The purpose of the study is to examine the communication strategies of SCE and the development those strategies underwent between the two crises. This is done by comparing their crisis communication strategies with the Contingency Theory of strategic conflict management. This is done by a comparative case study methodology, utilising content analysis and gauging the impact of the crisis communication efforts through select media reactions. The study is significant in that it …

Nouvelles formes de commercialisation au détail des fruits et légumes : du format du point de vente aux enjeux logistiques

2008

Cette recherche explore la contribution du choix d’organisation de l’amont du canal au renforcement de la position concurrentielle de l’enseigne de detail a partir d’une application au marche des fruits et legumes en France. Trois dimensions sont abordees. Dans un premier temps est propose un cadre theorique de l’interaction entre dynamique des formes de vente au detail et dynamique du canal, aboutissant a une typologie en trois classes des formats de vente specialises dans les fruits et legumes. Dans un second temps, les pratiques marketing de ces formats donnent lieu a une approche comparative. Dans un troisieme temps, enfin, la relation entre strategie de vente au detail et organisation …

Le ministère de la culture, 1959-2009 : quel bilan ? Quelles orientations ?

2009

National audience

Mathematical and Coding Lessons Based on Creative Origami Activities

2019

AbstractThis paper considers how creativity and creative activities can be encouraged in regular mathematical classes by combining different teaching approaches and academic disciplines. We combined origami and paper folding with fractals and their mathematical properties as well as with coding in Scratch in order to facilitate learning mathematics and computer science. We conducted a case study experiment in a Serbian school with 15 high school students and applied different strategies for learning profound mathematical and coding concepts such as fractals dimension and recursion. The goal of the study was to employ creative activities and examine students’ activities during this process i…