Extended overview techniques for outdoor augmented reality

In this paper, we explore techniques that aim to improve site understanding for outdoor Augmented Reality (AR) applications. While the first person perspective in AR is a direct way of filtering and zooming on a portion of the data set, it severely narrows overview of the situation, particularly over large areas. We present two interactive techniques to overcome this problem: multi-view AR and variable perspective view. We describe in details the conceptual, visualization and interaction aspects of these techniques and their evaluation through a comparative user study. The results we have obtained strengthen the validity of our approach and the applicability of our methods to a large range of application domains.     

Which security policies are enforceable by runtime monitors? A survey

Runtime monitoring is a widely used approach to ensure code safety. Several implementations of formal monitors have been proposed in the literature, and these differ with respect to the set of security policies that they are capable of enforcing. In this survey, we examine the evolution of knowledge regarding the issue of precisely which security policies monitors are capable of enforcing. We identify three stages in this evolution. In the first stage, we discuss initial limits on the set of enforceable properties and various ways in which this set can be extended. The second stage presents studies that identify constraints to the enforcement power of monitors. In the third stage, we present a final series of studies that suggest various alternative definitions of enforcement, which specify both the set of properties the monitors can enforce as well as the manner by which this enforcement is provided.     

Dynamic Delaunay tetrahedralisation of a deforming surface

Reconstruction algorithms make it possible to retrieve a surface from the Delaunay tetrahedralisation (DT) of a point sampling, whose density reflects the surface local geometry and thickness. Most of these algorithms are static and some work remains to be done to handle deforming surfaces. In such case, we defend the idea that each point of the sampling should move with the surface using the information given by the motion to allow fast reconstruction. In this article, we tackle the problem of producing a good evolving sampling of a deforming surface S, and maintaining its DT along the motion. The surface is known only through a projection operator (O ₁):ℝ³→S, and a normal operator (O ₂) that returns the oriented normal at a point on the surface. On that basis, we offer some perspectives on how reconstruction algorithms can be extended to the tracking of deforming surfaces.     

Burkitt-like lymphomas in AIDS patients: characterization within a series of 103 human immunodeficiency virus-associated non-Hodgkin's lymphomas. Burkitt's Lymphoma Study Group

PURPOSE: Burkitt-like lymphoma (BLL) is a tumor with morphologic features intermediate between Burkitt's lymphoma (BL) and large-cell lymphoma, but its relationship with these lymphomas is currently unclear. We have therefore analyzed its characteristics within a large series of human immunodeficiency virus (HIV)-associated lymphomas. MATERIALS AND METHODS: Clinical, histologic, immunophenotypic, and molecular analyses were performed on 103 patients with AIDS lymphomas. RESULTS: Nineteen cases (18.4%) were identified as BLL. They were monoclonal B-cell proliferations, as evaluated by immunoglobulin (Ig) gene rearrangement analyses, and had rearrangement of the c-myc oncogene in 68% of cases but not the bcl-2 gene, in contrast to a previous study on non-HIV-associated BLL. This molecular pattern was therefore identical to that of typical BL, suggesting that they represented tumors of similar origin. However, some features could clearly differentiate BLL from BL and were similar to those seen in the diffuse large-cell immunoblastic lymphomas (DLC-IBL) group. These included a greater frequency of Epstein-Barr Virus (EBV) infection (79% v 48%, P = .04), an upregulation of CD39 (50% v 0%, P = .0007) and CD70 (75% v 15%, P = .003) activation antigens and of the CD11a/LFA-1 adhesion molecule (83% v30%, P = .05), and, finally, a lower CD4 count (mean, 119/microL v 270/microL, P = .04). CONCLUSION: BLL is a frequent entity among AIDS lymphomas and should be considered as a morphologic variant of BL in the context of severe immunodepression that occurs in HIV-infected patients.     

Une approche générale du concept d’antenne active pour les antennes et les réseaux microrubans à partir de la théorie des diffuseurs chargés

A quantitative and general approach of the active antenna concept concretized in planar type microstrip technologies is proposed using integral equation techniques associated with the multiport representation of loaded scatterers. Two configurations based on this concept, involving electromagnetically fed microstrip dipole combined with either passive loads simulating a monolithic switch or active loads simulating a monolithic amplifier are computed to illustrate the extended capacities of this new approach. Theoretical results on matching characteristics are compared to measurements achieved on X band.     

Cooperative Fusion for Multi-Obstacles Detection With Use of Stereovision and Laser Scanner

We propose a new cooperative fusion approach between stereovision and laser scanner in order to take advantage of the best features and cope with the drawbacks of these two sensors to perform robust, accurate and real time-detection of multi-obstacles in the automotive context. The proposed system is able to estimate the position and the height, width and depth of generic obstacles at video frame rate (25 frames per second). The vehicle pitch, estimated by stereovision, is used to filter laser scanner raw data. Objects out of the road are removed using road lane information computed by stereovision. Various fusion schemes are proposed and one is experimented. Results of experiments in real driving situations (multi-pedestrians and multi-vehicles detection) are presented and stress the benefits of our approach.Raphaël Labayrade was born in France, in 1976. He received the M.S. degree in 2000 from the university of Saint Etienne, and he was also graduate from the ENTPE engineer school in 2000. In 2004 he received the Ph.D. degree from the university Pierre et Marie Curie Paris VI. In his thesis he proposed a new approach for detecting road obstacles using stereovision in a generic, fast and robust manner.He is currently a researcher at INRETS since 2004 in the perception team of the LIVIC department and works on automated highway and on on-board driving assistance systems. His main work deals with obstacles detection using data fusion but he is also interested in road lane recognition. He is involved for vision tasks in various european and french projects dealing with intelligent vehicles (Carsense, Micado, Arcos). He teaches at Jussieu (Paris VI), Ecole Nationale des Ponts et Chaussées, University of Versailles.He is the author and co-author of several technical papers.Cyril Royere was born in France, in 1972. He received the M.S. degree in 1995 from the university of Reims. In 2002 he received the Ph.D. degree from the university of Technology of Compiegne. In his thesis, he describes the origins of the conflict which appears when combining of various sources of imperfect information within the framework of the belief theory. Since 2002, he is a researcher at INRETS, into the perception team of the LIVIC department (Laboratory on interactions between vehicles, Infrastructure and drivers) and works on automated highway and on on-board driving assistance systems. His main work deals with obstacles detection using data fusion. He is involved for multi-sensor fusion tasks in several European and French projects dealing with intelligent vehicles (CARSENSE, MICADO, ARCOS).He is the author and co-author of several technical papers.Dominique Gruyer was born in France, in 1969. He received the M.S. and Ph.D. degree respectively in 1995 and 1999 from the university of Technology of Compiëgne.Since 2001, he is a researcher at INRETS, into the perception team of the LIVIC department (Laboratory on interactions between vehicles, Infrastructure and drivers) and he works on the study and the development of multi-sensor/sources association, combination and fusion. His works enter into the conception of on-board driving assistance systems and more precisely on the carry out of multi-obstacle detection and tracking, extended perception, accurate localization, anti-collision system, collision mitigation. He is involved for multi-sensor fusion tasks in several European and French projects dealing with intelligent vehicles (CARSENSE, MICADO, ARCOS). He is a multi-sensor fusion expert for several companies, teaches at Orsay (Paris XI), Ecole Nationale des Ponts et Chaussées and University of Technologie of Compiëgne.He is the author and co-author of several technical papers.Didier Aubert was born in France, in 1963. He received the M.S. and Ph.D. degree respectively in 1985 and 1989 from the university of Grenoble. From 1989–1990, he worked as a research scientist on the development of an automatic road following system for the NAVLAB at Carnegie Mellon University. From 1990–1994, he worked in the research department of a private company (ITMI). During this period he was project leader of several projects dealing with computer vision (Multi-resolution, color, motion detection, 3D reconstruction, 3D location, Shape recognition, automatic shape modelling, object tracking), mobile robotic (calibration, roads following, free space computation) and manipulator robotic (calibration, automatic surface tracking). He was also working as an expert for companies on the face recognition, 3D location and roads following topics. He is currently a researcher at INRETS since 1995, manages the perception team of the LIVIC department and works on car traffic monitoring, crowd monitoring, incidents detection, automated highway and on on-board driving assistance systems. He is an image processing expert for several compagnies, teaches at Jussieu (Paris VI), Ecole Nationale des Ponts et Chaussées, Ecole Nationale Supérieure des Télécommunications, Orsay (Paris XI) and is at the editorial board of RTS (Research-Transport-Safety).He is the author and co-author of several technical papers and has participated to the redaction of the books named “Robotique mobile” and “la route automatisée.”     

Realistic rendering of an organ surface in real-time for laparoscopic surgery simulation

Published online: 23 April 2002     

Capillary-based static self-assembly in higher organisms

Organized structures produced by dynamic self-assembly are often observed in animal groups. Static self-assembly, however, has to date only been observed at the cellular and sub-cellular levels. The aim of this study was to analyse organized structures in immobile whirligig beetle groups on the water surface. We used theoretical and computational approaches to model the meniscus around whirligig beetles and to calculate the surface energy for configurations involving two beetles. Theoretical predictions were then tested using live insects and resin casts. Observations were also made for three and more casts. The meniscus of whirligig beetles had a bipolar shape with two concave parts. For two beetles, predicted configurations based on energy minima corresponded to beetles in contact by their extremities, forming lines and arrows, and agreed well with observations. Experimental results for three and more beetle casts revealed new geometrical arrangements similar to those obtained with colloids at interfaces. This study provides the first example of static self-assembly at the inter-organism level and shows the importance of capillary interactions in such formations. We identify the ecological context in which our findings are of relevance.     

Characterization of ZrOxCyHz thin films deposited by MMP–DECR reactor using Zirconium Tert-Butoxide/O2 mixture

Thin films are deposited in a multipolar microwave plasma reactor excited by distributed electron cyclotron resonance (MMP–DECR) using Zirconium Tert-Butoxide (ZTB) as precursor and characterized in function of two process parameters: microwave power and ratio gas mixture (O₂/ZTB + O₂). Their influences on deposition rate, density, chemical bonds, atomic composition and microstructure of the deposits are presented: for pure ZTB plasma the films contain a high rate of hydrocarbon and their density is low (close to hydrogenated carbon film density). The study versus microwave power shows that film contains less hydrocarbon at high power than at low power but the addition of O₂ to ZTB appears to be mainly responsible for hydrocarbon removal. Moreover microstructure analysis shows a columnar growth when a high amount of O₂ (≥ 90%) is added in the gas mixture.     

Efficient Lossy Compression for IoT Using SZ and Reconstruction with 1D U-Net

Mobile Networks and Applications - Several recent research has centered on maximizing Internet of Things (IoT) devices’ lifetime by deploying data reduction techniques on IoT nodes to reduce...