Résumé. L’image médicale 4D représente une succession d’images volumiques sur l’axe temporelle, ce qui représente une énorme quantité de données à compresser afin de la stockée ou de la transmettre. Dans cet article, nous présentons une technique de compression d’images médicales 4D basée sur le SPIHT3D. Cette technique applique la transformée en ondelettes 3D afin d’éliminer efficacement les r...

In the 1970s, some people believed in using computers for making almost any information available to anyone and for supporting information exchange and discussions regardless of geographical distances. These ideas were, at that time, novel and revolutionary. Some people regarded these ideas as dangerous; for example, the Swedish Data Inspection Board (Datainspektionen) forbade people from stori...

We report a study of a collaborative human-robot system composed of a science team (located in Pittsburgh), an engineering team (located in Chile), and a rover (located in Chile). The project was intended to be analogous to and inform planetary exploration. We performed observations simultaneously at both sites over two weeks as scientists collected data using the rover. We observed problems in...

The ubiquitous availability of broadband Internet connectivity at home is driving the use of the Internet for entertainment and other forms of recreation. Paving the way for many demanding multimedia applications over IP, it has accelerated the emergence of new ideas for network-centric collaborative work that was impossible only a few years ago for both technical and economic reasons. Among ma...

Coordinating software tasks across geographic locations is difficult because of factors like: limited opportunities for interaction, lack of contextual references, and leaner communication media. Team cognition research suggests that team knowledge helps members coordinate because they can anticipate task issues more accurately, communicate more efficiently and find expertise within the team, a...

This paper presents an overview of the field of distributed development of software systems and applications (DD). Based on an analysis of the published literature, including its use in different industrial contexts, we provide a preliminary analysis that structures existing DD knowledge, indicating opportunities but identifying threats to communication, coordination, and control caused by temp...

This paper studies the problem of estimating geographical locations of images. To build reliable geographical estimators, an important question is to find distinguishable geographical clusters in the world. Those clusters cover general geographical regions and are not limited to landmarks. The geographical clusters provide more training samples and hence lead to better recognition accuracy. Pre...

Samples of phytobenthos were collected during three different seasons in 2005 along a linear transect of a lowland peat bog at various spatial scales (10 cm, 1 m, 10 m) to investigate the seasonal dynamics, diversity, and factors influencing the spatial patterns of microalgal communities. Non-metric multidimensional scaling (NMDS), similarity percentage (SIMPER) analyses, ANOSIM, Mantel tests a...

Evaluating the impact of scholarly papers plays an important role for addressing recruitment decision, funding allocation and promotion, etc. Yet little is known how actual geographic distance influences the impact of scholarly papers. In this paper, we leverage the law of geographic distance and citations between different institutions to weight quantum Pagerank algorithm for objectively measu...

In this study we apply hierarchical spectral partitioning of bipartite graphs to a Dutch dialect dataset to cluster dialect varieties and determine the concomitant sound correspondences. An important advantage of this clustering method over other dialectometric methods is that the linguistic basis is simultaneously determined, bridging the gap between traditional and quantitative dialectology. ...