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Thai V.,National University of Ireland | Rouille P.-Y.,Ecole Nationale Superieure de Cognitique | Handschuh S.,National University of Ireland
ACM Transactions on Intelligent Systems and Technology | Year: 2012

Faceted navigation is a technique for the exploration and discovery of a collection of resources, which can be of various types including text documents. While being information-rich resources, documents are usually not treated as content-bearing items in faceted browsing interfaces, and yet the required clean metadata is not always available or matches users' interest. In addition, the existing linear listing paradigm for representing result items from the faceted filtering process makes it difficult for users to traverse or compare across facet values in different orders of importance to them. In this context, we report in this article a visual support toward faceted browsing of a collection of documents based on a set of entities of interest to users. Our proposed approach involves using a multi-dimensional visualization as an alternative to the linear listing of focus items. In this visualization, visual abstraction based on a combination of a conceptual structure and the structural equivalence of documents can be simultaneously used to deal with a large number of items. Furthermore, the approach also enables visual ordering based on the importance of facet values to support prioritized, cross-facet comparisons of focus items. A user study was conducted and the results suggest that interfaces using the proposed approach can support users better in exploratory tasks and were also well-liked by the participants of the study, with the hybrid interface combining the multidimensional visualization with the linear listing receiving the most favorable ratings. © 2012 ACM. Source

Salotti J.-M.,Laboratoire Of Lintegration Du Materiau Au Systeme Umr 5218 | Laithier C.,Ecole Nationale Superieure de Cognitique | Machut B.,Ecole Nationale Superieure de Cognitique | Marie A.,Ecole Nationale Superieure de Cognitique | And 3 more authors.
Advances in Space Research | Year: 2015

For a human mission to the Moon or Mars, an important question is to determine the best strategy for the choice of surface vehicles. Recent studies suggest that the first missions to Mars will be strongly constrained and that only small unpressurized vehicles will be available. We analyze the exploration capabilities and limitations of small surface vehicles from the user perspective. Following the "human centered design" paradigm, the team focused on human systems interactions and conducted the following experiments:- The Austrian Space Forum (OeWF) coordinated a Mars analog research program in Morocco in February 2013. During this 23-nation expedition, we studied surface mobility aspects in challenging terrains also to be expected on Mars. Two test subjects in high-fidelity spacesuit simulators and driving All-Terrain Vehicles (ATV, aka quads) had to traverse various obstacles found in a desert region and answer a list of questions about their vehicle, the obstacles and possible options to go further.- Another member of our team participated in the ILEWG EuroMoonMars 2013 simulation at the Mars Desert Research Station in Utah during the same period of time. Although the possible traverses were restricted, a similar study with analog space suits and quads has been carried out.- Other experiments have been conducted in an old rock quarry close to Bordeaux, France. An expert in the use of quads for all types of terrains performed a demonstration and helped us to characterize the difficulties, the risks and advantages and drawbacks of different vehicles and tools. The vehicles that will be used on the surface of Mars have not been defined yet. Nevertheless, the results of our project already show that using a light and unpressurized vehicle (in the order of 150 kg) for the mobility on the Martian surface can be a true advantage. Part of the study was dedicated to the search for appropriate tools that could be used to make the vehicles easier to handle, safer to use and more efficient in the field to cross an obstacle. The final recommendation is to use winches and ramps, which already are widely used by quad drivers. We report on the extension of the reachable areas if such tools were available. This work has been supported by ILEWG, EuroMoonMars and the Austrian Space Forum (OEWF). © 2014 COSPAR. Source

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