TGVizTab: An ontology visualisation extension for Protégé

Ontologies are gaining a lot of interest and many are being developed to provide a variety of knowledge services. There is an increasing need for tools to graphically and in-teractively visualise such modelling structures to enhance their clarification, verification and analysis. Protégé 2000 is one of the most popular ontology modelling tools currently available. This paper introduces TGVizTab; a new Protégé plugin based on TouchGraph technology to graphically visualise Protégé?s ontologies

Un guide sur la toile pour sélectionner un logiciel de tracé de graphes

Nouvelle adresse du site : http://gvsr.polytech.univ-nantes.frNational audienceLes graphes permettent d'une part, en tant qu'objets combinatoires, de modéliser et d'analyser des systèmes de relations complexes entre des entités et d'autre part, de représenter ces relations sur des supports visuels afin de les rendre accessibles à un utilisateur non spécialiste. Si ces derniers sont rapidement devenus des outils privilégiés pour de nombreuses problématiques applicatives comme la découverte de relations non explicites en veille technologique, le choix d'une méthode de visualisation efficace reste encore très souvent une question ouverte pour l'utilisateur. Afin de guider ce dernier dans sa sélection, nous dressons une typologie succincte des principaux modes de représentation à savoir le tracé statique, le tracé interactif et le tracé des très grands graphes, et nous finissons par la présentation d'un nouveau site Web, dédié au référencement des logiciels de tracés de graphes. Le site est consultable à l'adresse : http://hulk.knowesis.fr/GVSR http://gvsr.polytech.univ-nantes.fr. Son originalité réside en particulier dans une présentation homogène des informations pertinentes mises en œuvre au travers d'un ensemble de fiches codées en XML

A knowledge discovery service system for provenance exploration.

Scientific research has moved from an isolated environment into a collaborated culture due to the data explosion and the experiment complexity. Several scientific workflow systems have been developed to support scientists to conduct the scientific analysis and create knowledge. They provide the ability to automatically record provenance, the process that led to a particular data, which can be used by other scientists for better understanding, re-using and verifying a data product to generate new knowledge. However, most of the existing scientific workflow systems provide poor query capability for users to effectively find relevant provenance information. It is not a trivial task due to the complexity of the workflow and the size of the provenance graphs. In this work, we propose a system architecture for provenance exploration in which querying, navigation and visualization methods are combined together. It enables effective and efficient knowledge discovery among various provenance information generated by different workflow runs

A parent-centered radial layout algorithm for interactive graph visualization and animation

We have developed (1) a graph visualization system that allows users to explore graphs by viewing them as a succession of spanning trees selected interactively, (2) a radial graph layout algorithm, and (3) an animation algorithm that generates meaningful visualizations and smooth transitions between graphs while minimizing edge crossings during transitions and in static layouts. Our system is similar to the radial layout system of Yee et al. (2001), but differs primarily in that each node is positioned on a coordinate system centered on its own parent rather than on a single coordinate system for all nodes. Our system is thus easy to define recursively and lends itself to parallelization. It also guarantees that layouts have many nice properties, such as: it guarantees certain edges never cross during an animation. We compared the layouts and transitions produced by our algorithms to those produced by Yee et al. Results from several experiments indicate that our system produces fewer edge crossings during transitions between graph drawings, and that the transitions more often involve changes in local scaling rather than structure. These findings suggest the system has promise as an interactive graph exploration tool in a variety of settings

Anagopos: A Reduction Graph Visualizer for Term Rewriting and Lambda Calculus

We present Anagopos, an open source tool for visualizing reduction graphs of terms in lambda calculus and term rewriting. Anagopos allows step-by-step generation of reduction graphs under six different graph drawing algorithms. We provide ample examples of graphs drawn with the tool

Building a Knowledge Graph for the Air Traffic Management Community

Historically, most of the focus in the knowledge graph community has been on the support for web, social network, or product search applications. This paper describes some of our experience in developing a large-scale applied knowledge graph for a more technical audience with more specialized information access and analysis needs - the air traffic management community. We describe ATMGRAPH (NASA's Air Traffic Management (ATM) Knowledge Graph), a knowledge graph created by integrating various sources of structured aviation data, provided in large part by US federal agencies. We review some of the practical challenges we faced in creating this knowledge graph

Visual Analysis of Complex Networks for Business Intelligence with Gephi

International audiencePlatforms which combine data mining algorithms and interactive visualizations play a key role in the discovery process from complex networks data, e.g. Web and Online Social Networks data. Here we illustrate the use of Gephi, an open source software for networks visual exploration, for the visual analysis of Business Intelligence data modeled as complex networks