The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Nicolas Gaud - One of the best experts on this subject based on the ideXlab platform.
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E4MAS - Organizational and Holonic Modelling of a Simulated and Synthetic Spatial Environment
Lecture Notes in Computer Science, 2015Co-Authors: Stéphane Galland, Nicolas GaudAbstract:Multiagent-based simulations enable us to validate different use-case scenarios in a lot of application domains. The idea is to develop a realistic virtual Environment to test particular domain-specific procedures. This paper presents a holonic model -- hierarchy of agents -- of a simulated physical Environment for the simulation of crowds in virtual 3D buildings. The major contributions of this paper are the agentization of the Environment model to support multilevel simulation, and the definition of energy-based indicators to control the execution of the model. Finally, the application of the model inside an airport terminal is presented. It permits to validate the principles of the models and the corresponding computational gains.
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Organizational and Holonic Modelling of a Simulated and Synthetic Spatial Environment
Agent Environments for Multi-Agent Systems IV, 2015Co-Authors: Stéphane Galland, Nicolas GaudAbstract:Multiagent-based simulations enable us to validate different use-case scenarios in a lot of application domains. The idea is to develop a realistic virtual Environment to test particular domain-specific procedures. This paper presents a holonic model — hierarchy of agents — of a simulated physical Environment for the simulation of crowds in virtual 3D buildings. The major contributions of this paper are the agentization of the Environment model to support multilevel simulation, and the definition of energy-based indicators to control the execution of the model. Finally, the application of the model inside an airport terminal is presented. It permits to validate the principles of the models and the corresponding computational gains.
Stéphane Galland - One of the best experts on this subject based on the ideXlab platform.
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E4MAS - Organizational and Holonic Modelling of a Simulated and Synthetic Spatial Environment
Lecture Notes in Computer Science, 2015Co-Authors: Stéphane Galland, Nicolas GaudAbstract:Multiagent-based simulations enable us to validate different use-case scenarios in a lot of application domains. The idea is to develop a realistic virtual Environment to test particular domain-specific procedures. This paper presents a holonic model -- hierarchy of agents -- of a simulated physical Environment for the simulation of crowds in virtual 3D buildings. The major contributions of this paper are the agentization of the Environment model to support multilevel simulation, and the definition of energy-based indicators to control the execution of the model. Finally, the application of the model inside an airport terminal is presented. It permits to validate the principles of the models and the corresponding computational gains.
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Organizational and Holonic Modelling of a Simulated and Synthetic Spatial Environment
Agent Environments for Multi-Agent Systems IV, 2015Co-Authors: Stéphane Galland, Nicolas GaudAbstract:Multiagent-based simulations enable us to validate different use-case scenarios in a lot of application domains. The idea is to develop a realistic virtual Environment to test particular domain-specific procedures. This paper presents a holonic model — hierarchy of agents — of a simulated physical Environment for the simulation of crowds in virtual 3D buildings. The major contributions of this paper are the agentization of the Environment model to support multilevel simulation, and the definition of energy-based indicators to control the execution of the model. Finally, the application of the model inside an airport terminal is presented. It permits to validate the principles of the models and the corresponding computational gains.
Shane G. Telfer - One of the best experts on this subject based on the ideXlab platform.
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Modulating the Performance of an Asymmetric Organocatalyst by Tuning Its Spatial Environment in a Metal–Organic Framework
Journal of the American Chemical Society, 2017Co-Authors: Lujia Liu, Tian-you Zhou, Shane G. TelferAbstract:Systematically tuning the Spatial Environment around the active sites of synthetic catalysts is a difficult challenge. Here, we show how this can be accomplished in the pores of multicomponent metal-organic frameworks. This relies on embedding a catalytic unit in a pore of the MUF-77 framework and then tuning its Environment by introducing different functional groups to the surrounding linkers. This approach benefits from the structural regularity of MUF-77, which places each component in a precise location to circumvent disorder. Prolinyl groups, which are catalytically competent toward asymmetric aldol reactions, were selected as the catalytic unit. Since every prolinyl group is positioned in an identical Environment, correlations between the pore architecture and the activity of these single-site catalysts can be elucidated. Systematic engineering of the pore structure, which is achieved by installing modulator groups on the framework linkers, impacts on the reaction rate and the enantiomeric excess of the aldol products. Furthermore, the Spatial Environment around the proline catalyst can override its innate stereochemical preference to dictate the preferred enantiomer of the reaction product. These results offer a new way to design three-dimensional active site Environments for synthetic catalysts.
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modulating the performance of an asymmetric organocatalyst by tuning its Spatial Environment in a metal organic framework
Journal of the American Chemical Society, 2017Co-Authors: Lujia Liu, Tian-you Zhou, Shane G. TelferAbstract:Systematically tuning the Spatial Environment around the active sites of synthetic catalysts is a difficult challenge. Here, we show how this can be accomplished in the pores of multicomponent metal–organic frameworks. This relies on embedding a catalytic unit in a pore of the MUF-77 framework and then tuning its Environment by introducing different functional groups to the surrounding linkers. This approach benefits from the structural regularity of MUF-77, which places each component in a precise location to circumvent disorder. Prolinyl groups, which are catalytically competent toward asymmetric aldol reactions, were selected as the catalytic unit. Since every prolinyl group is positioned in an identical Environment, correlations between the pore architecture and the activity of these single-site catalysts can be elucidated. Systematic engineering of the pore structure, which is achieved by installing modulator groups on the framework linkers, impacts on the reaction rate and the enantiomeric excess of...
Giorgio Vallortigara - One of the best experts on this subject based on the ideXlab platform.
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modularity and Spatial reorientation in a simple mind encoding of geometric and nongeometric properties of a Spatial Environment by fish
Cognition, 2002Co-Authors: Valeria Anna Sovrano, Angelo Bisazza, Giorgio VallortigaraAbstract:When disoriented in Environments with distinctive geometry, such as a closed rectangular arena, human infants and adult rats reorient in accord with the large-scale shape of the Environment, but not in accord with nongeometric properties such as the colour of a wall. Human adults, however, conjoined geometric and nongeometric information to reorient themselves, which has led to the suggestion that Spatial processing tends to become more flexible over development and evolution. We here show that fish tested in the same tasks perform like human adults and surpass rats and human infants. These findings suggest that the ability to make use of geometry for Spatial reorientation is an ancient evolutionary tract and that flexibility and accessibility to multiple sources of information to reorient in space is more a matter of ecological adaptations than phylogenetic distance from humans.
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Young chickens learn to localize the centre of a Spatial Environment.
Journal of comparative physiology. A Sensory neural and behavioral physiology, 1997Co-Authors: Luca Tommasi, Giorgio Vallortigara, M ZanforlinAbstract:Young chickens were trained to find food by ground-scratching in the centre of a closed uniform arena and were then tested in arenas of similar areas but of different shapes. Chickens showed localized searching behaviour in the square-shaped arena, and maintained this behaviour when placed in a circular or triangular (both equilateral and isosceles) arena. With a rectangular-shaped arena, obtained by doubling the original square-shaped one, chickens showed more dispersed searching along the major axis, but searching tended to be concentrated around the centres of the composing squares and around the centre of the rectangle itself. When trained in a square- or triangle-shaped arena and then tested in an arena of the same shape but a larger area, chickens displayed searching behaviour at two different distances from the wall of the arena, one corresponding to the correct distance (i.e. centre) in the smaller (training) arena, the other to the actual centre of the test arena. On the other hand, in a circular arena, chickens searched mainly at a distance midway between the radius of the small (training) and of the large (testing) circular arena. These results suggest that, during training, chickens encoded information on both the absolute and the relative distance of the food from the walls of the arena, the latter information being more accurate when the arena displayed identifiable features such as corners.
Martin J. Whiting - One of the best experts on this subject based on the ideXlab platform.
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Influence of Spatial Environment on maze learning in an African mole-rat
Animal cognition, 2012Co-Authors: Lydia Du Toit, Nigel C. Bennett, Alecia Nickless, Martin J. WhitingAbstract:In subterranean species where excavation is energetically expensive, efficient Spatial navigation is vital to reducing the costs of locating important resources such as food and mates. While Spatial navigational ability is positively correlated with sociality in subterranean mammals, we have a less clear understanding of the role of habitat complexity on navigational ability. We tested Spatial navigational ability and memory in 12-18-month captive Natal mole-rats (Cryptomys hottentotus natalensis) maintained in a simple Environment with no Environmental enrichment and newly captured wild individuals from natural, complex burrow systems. In maze trials, mole-rats captured freshly from the wild made significantly fewer navigational errors, were more likely to successfully navigate the maze, travelled shorter distances and as a consequence, completed the maze in less time. Male mole-rats from both experimental treatments were more likely to complete the maze than females. Memory retention of the maze was tested on day two, seven, 30 and 60, respectively. The results were variable, although both groups showed a significant memory retention 60 days after testing. Our results highlight the potential importance of the Environment (microhabitat complexity) on Spatial cognitive performance in mole-rats.
