Thu, 24 Jul 2008 23:06:17 BST CiteULike: Author Chittaro http://www.citeulike.org/author/Chittaro CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/madpickle/article/2582819 <i>(2006), pp. 239-246.</i> Visualizing locations of off-screen objects on mobile devices: a comparative evaluation of three approaches Stefano Burigat Luca Chittaro Silvia Gabrielli doi:10.1145/1152215.1152266 (2006), pp. 239-246. 2008-03-24T21:21:20-00:00 2006 239 246 ACM notelinkr seamless http://www.citeulike.org/user/galkin/article/2918693 <i>Data Knowl. Eng., Vol. 44, No. 2. (February 2003), pp. 239-264.</i> Visualizing queries on databases of temporal histories: new metaphors and their evaluation Luca Chittaro Carlo Combi Data Knowl. Eng., Vol. 44, No. 2. (February 2003), pp. 239-264. 2008-06-23T12:09:20-00:00 2003 Data Knowl. Eng. 44 2 239 264 Elsevier Science Publishers B. V. time http://www.citeulike.org/user/ricberta/article/2859061 <i>Computers & Education, Vol. 49, No. 1. (August 2007), pp. 93-109.</i><br /><br />Web-based education and training provides a new paradigm for imparting knowledge; students can access the learning material anytime by operating remotely from any location. Web3D open standards, such as X3D and VRML, support Web-based delivery of Educational Virtual Environments (EVEs). EVEs have a great potential for learning and training purposes, by allowing one to circumvent physical, safety, and cost constraints. Unfortunately, EVEs often leave to the user the onus of taking the initiative both in exploring the environment and interacting with its parts. A possible solution to this problem is the exploitation of virtual humans acting as informal coaches or more formal instructors. For example, virtual humans can be employed to show and explain maintenance procedures, allowing learners to receive more practical explanations which are easier to understand. However, virtual humans are rarely used in Web3D EVEs, since the programming effort to develop and re-use them in different environments can be considerable. In this paper, we present a general architecture that allows content creators to easily integrate virtual humans into Web3D EVEs. To test the generality of our solution, we present two practical examples showing how the proposed architecture has been used in different educational contexts. Employing virtual humans for education and training in X3D/VRML worlds Lucio Ieronutti Luca Chittaro doi:10.1016/j.compedu.2005.06.007 Computers & Education, Vol. 49, No. 1. (August 2007), pp. 93-109. 2008-06-03T13:15:29-00:00 2007 Computers & Education 49 1 93 109 no-tag http://www.citeulike.org/user/fheintz/article/2808698 <i>Artificial Intelligence, Vol. 155, No. 1-2. (May 2004), pp. 147-182.</i><br /><br />Abstraction has been advocated as one of the main remedies for the computational complexity of model-based diagnosis. However, after the seminal work published in the early nineties, little research has been devoted to this topic. In this paper, we consider one of the types of abstraction commonly used in diagnosis, i.e., structural abstraction, investigating it both from a theoretical and practical point of view. First, we provide a new formalization for structural abstraction that generalizes and extends previous ones. Then, we present two new different techniques for model-based diagnosis that automatically derive easier-to-diagnose versions of a (hierarchical) diagnosis problem on the basis of the available observations. The two proposed techniques are formulated as extensions of the well-known Mozetic's algorithm [I. Mozetic, Hierarchical diagnosis, in: W.H.L. Console, J. de Kleer (Eds.), Readings in Model-Based Diagnosis, Morgan Kaufmann, San Mateo, CA, 1992, pp. 354-372], and experimentally contrasted with it to evaluate the obtained efficiency gains. Hierarchical model-based diagnosis based on structural abstraction Luca Chittaro Roberto Ranon doi:10.1016/j.artint.2003.06.003 Artificial Intelligence, Vol. 155, No. 1-2. (May 2004), pp. 147-182. 2008-05-18T08:33:50-00:00 2004 Artificial Intelligence 155 1-2 147 182 abstraction diagnosis http://www.citeulike.org/user/fryanpan/article/2712551 <i>(2006), pp. 227-235.</i> Navigation aids for multi-floor virtual buildings: a comparative evaluation of two approaches Luca Chittaro Subramanian Venkataraman doi:10.1145/1180495.1180542 (2006), pp. 227-235. 2008-04-24T09:38:10-00:00 2006 227 235 ACM floor hci visualization http://www.citeulike.org/group/2118/article/2582828 <i>(2005), pp. 107-114.</i> Augmenting audio messages with visual directions in mobile guides: an evaluation of three approaches Luca Chittaro Stefano Burigat doi:10.1145/1085777.1085795 (2005), pp. 107-114. 2008-03-24T21:25:44-00:00 2005 107 114 ACM map mobile-computing mobile-guide http://www.citeulike.org/user/alivetec/article/2342177 <i>Artificial Intelligence in Medicine, Vol. 42, No. 2. (February 2008), pp. 153-163.</i><br /><br />SummaryObjective Cardiovascular disease, obesity, and lack of physical fitness are increasingly common and negatively affect people's health, requiring medical assistance and decreasing people's wellness and productivity. In the last years, researchers as well as companies have been increasingly investigating wearable devices for fitness applications with the aim of improving user's health, in terms of cardiovascular benefits, loss of weight or muscle strength. Dedicated GPS devices, accelerometers, step counters and heart rate monitors are already commercially available, but they are usually very limited in terms of user interaction and artificial intelligence capabilities. This significantly limits the training and motivation support provided by current systems, making them poorly suited for untrained people who are more interested in fitness for health rather than competitive purposes. To better train and motivate users, we propose the mobile personal trainer (MOPET) system.Methods and material MOPET is a wearable system that supervises a physical fitness activity based on alternating jogging and fitness exercises in outdoor environments. By exploiting real-time data coming from sensors, knowledge elicited from a sport physiologist and a professional trainer, and a user model that is built and periodically updated through a guided autotest, MOPET can provide motivation as well as safety and health advice, adapted to the user and the context. To better interact with the user, MOPET also displays a 3D embodied agent that speaks, suggests stretching or strengthening exercises according to user's current condition, and demonstrates how to correctly perform exercises with interactive 3D animations.Results and conclusion By describing MOPET, we show how context-aware and user-adaptive techniques can be applied to the fitness domain. In particular, we describe how such techniques can be exploited to train, motivate, and supervise users in a wearable personal training system for outdoor fitness activity. MOPET: A context-aware and user-adaptive wearable system for fitness training Fabio Buttussi Luca Chittaro doi:10.1016/j.artmed.2007.11.004 Artificial Intelligence in Medicine, Vol. 42, No. 2. (February 2008), pp. 153-163. 2008-02-06T14:45:56-00:00 2008 Artificial Intelligence in Medicine 42 2 153 163 no-tag http://www.citeulike.org/user/yenching/article/2272726 <i>Personal Ubiquitous Comput., Vol. 6, No. 4. (September 2002), pp. 237-244.</i> Evaluating Interface Design Choices on WAP Phones: Navigation and Selection Luca Chittaro Paolo Cin doi:10.1007/s007790200023 Personal Ubiquitous Comput., Vol. 6, No. 4. (September 2002), pp. 237-244. 2008-01-22T09:34:24-00:00 2002 Personal Ubiquitous Comput. 1617-4909 6 4 237 244 Springer-Verlag mobile navigation web http://www.citeulike.org/user/rstanchak/article/1269597 <i>Artif Intell Med, Vol. 22, No. 2. (May 2001), pp. 81-88.</i><br /><br />This paper provides an introduction to the field of information visualization (IV) and a discussion of its application to medical systems. More specifically, it aims at: (i) defining what IV is and what are its goals (ii) highlighting the similarities and differences between IV and traditional medical imaging (iii) illustrating the potential of IV for medical applications by examining several examples of implemented systems and (iv) giving some general indications about the purposes and the effective exploitation of an IV component into a medical system. Information visualization and its application to medicine. L Chittaro Artif Intell Med, Vol. 22, No. 2. (May 2001), pp. 81-88. 2007-05-01T03:44:02-00:00 2001 Artif Intell Med 0933-3657 22 2 81 88 no-tag http://www.citeulike.org/user/rstanchak/article/1269586 <i>Lecture Notes in Computer Science, Vol. 2101 (2001), pp. 227-??.</i><br /><br />reasoning system into a real-world application that can be adopted by a wide base of users is given by its user interface. After analyzing and discussing the state of the art for the visualization of temporal intervals and relations, this paper proposes three new solutions, also evaluating them with a proper user study. Visual Definition of Temporal Clinical Abstractions: A User Interface Based on Novel Metaphors Luca Chittaro Carlo Combi Lecture Notes in Computer Science, Vol. 2101 (2001), pp. 227-??. 2007-05-01T03:27:49-00:00 2001 Lecture Notes in Computer Science 2101 227 ?? no-tag http://www.citeulike.org/user/scis0000001/article/1220494 <i>Annals of Mathematics and Artificial Intelligence, Vol. 28, No. 1-4. (2000), pp. 47-106.</i><br /><br />this paper, we survey a wide range of research in temporal representation and reasoning, without committing ourselves to the point of view of any speci c application Temporal representation and reasoning in artificial intelligence: Issues and approaches Luca Chittaro Angelo Montanari Annals of Mathematics and Artificial Intelligence, Vol. 28, No. 1-4. (2000), pp. 47-106. 2007-04-11T12:35:00-00:00 2000 Annals of Mathematics and Artificial Intelligence 28 1-4 47 106 inference temporal http://www.citeulike.org/user/floydmueller/article/1202411 <i>(2006), pp. 29-36.</i> Bringing mobile guides and fitness activities together: a solution based on an embodied virtual trainer Fabio Buttussi Luca Chittaro Daniele Nadalutti doi:10.1145/1152215.1152222 (2006), pp. 29-36. 2007-04-02T04:42:01-00:00 2006 29 36 ACM Press fitness jogging mobile trainer http://www.citeulike.org/user/smokeyd/article/113305 <i>Environmental Biology of Fishes, Vol. 72, No. 2. (February 2005), pp. 175-187.</i><br /><br />We tested the hypothesis for several Caribbean reef fish species that there is no difference in nursery function among mangrove, seagrass and shallow reef habitat as measured by: (a) patterns of juvenile and adult density, (b) assemblage composition, and (c) relative predation rates. Results indicated that although some mangrove and seagrass sites showed characteristics of nursery habitats, this pattern was weak. While almost half of our mangrove and seagrass sites appeared to hold higher proportions of juvenile fish (all species pooled) than did reef sites, this pattern was significant in only two cases. In addition, only four of the six most abundant and commercially important species (Haemulon flavolineatum, Haemulon sciurus, Lutjanus apodus, Lutjanus mahogoni, Scarus iserti, and Sparisoma aurofrenatum) showed patterns of higher proportions of juvenile fish in mangrove and/or seagrass habitat(s) relative to coral reefs, and were limited to four of nine sites. Faunal similarity between reef and either mangrove or seagrass habitats was low, suggesting little, if any exchange between them. Finally, although relative risk of predation was lower in mangrove/seagrass than in reef habitats, variance in rates was substantial suggesting that not all mangrove/seagrass habitats function equivalently. Specifically, relative risk varied between morning and afternoon, and between sites of similar habitat, yet varied little, in some cases, between habitats (mangrove/seagrass vs. coral reefs). Consequently, our results caution against generalizations that all mangrove and seagrass habitats have nursery function. Variation in fish density, assemblage composition and relative rates of predation among mangrove, seagrass and coral reef habitats Paul Chittaro Paolo Usseglio Peter Sale doi:10.1007/s10641-004-9077-2 Environmental Biology of Fishes, Vol. 72, No. 2. (February 2005), pp. 175-187. 2005-03-03T17:36:24-00:00 2005 Environmental Biology of Fishes 0378-1909 72 2 175 187 Kluwer Academic Publishers abundance diversity ecology fish mangrove predators reef seagrass http://www.citeulike.org/user/xiaolong/article/315607 <i>(2005), pp. 57-64.</i> Location-aware visualization of VRML models in GPS-based mobile guides Stefano Burigat Luca Chittaro doi:10.1145/1050491.1050499 (2005), pp. 57-64. 2005-09-11T05:19:14-00:00 2005 57 64 ACM Press no-tag http://www.citeulike.org/user/palakorn/article/797830 <i>Computer Animation and Virtual Worlds, Vol. 15, No. 3-4. (2004), pp. 319-326.</i><br /><br />This paper presents a system for realistic behavioral programming of virtual characters, based on personality and probabilistic automata. We describe personality by using the Five-Factor Model and achieve autonomy through a goal-oriented approach. Each character perceives the surrounding world, decides how to behave and acts on the environment according to its personality and to its goals. The chief idea explored by the proposed approach is that personality has a probabilistic influence on behavior selection instead of a deterministic one. Different behavior sequences available to achieve a goal are modeled using probabilistic automata and making probability dependent on character personality. This leads to non-repetitive behaviors, whose evolution is not foreseeable. The paper first motivates the approach in the context of cybertherapy. Then, it summarizes related work and illustrates in detail the proposed approach. Finally, it presents obtained results and discusses the main limitations of the implemented system. Copyright © 2004 John Wiley & Sons, Ltd. Behavioral programming of autonomous characters based on probabilistic automata and personality Luca Chittaro Milena Serra doi:10.1002/cav.35 Computer Animation and Virtual Worlds, Vol. 15, No. 3-4. (2004), pp. 319-326. 2006-08-11T21:05:10-00:00 2004 Computer Animation and Virtual Worlds 15 3-4 319 326 behavioral-animation http://www.citeulike.org/user/yijisoo/article/497373 <i>Artificial Intelligence in Medicine, Vol. 22, No. 2. (2001), pp. 81-88.</i><br /><br />This paper provides an introduction to the field of Information Visualization (IV) and a discussion of its application to medical systems. More specifically, it aims at: (i) defining what IV is and what are its goals, (ii) highlighting the similarities and differences between IV and traditional medical imaging, (iii) illustrating the potential of IV for medical applications by examining several examples of implemented systems, (iv) giving some general indications about the purposes and the... Information visualization and its application to medicine Luca Chittaro Artificial Intelligence in Medicine, Vol. 22, No. 2. (2001), pp. 81-88. 2006-02-07T22:24:31-00:00 2001 Artificial Intelligence in Medicine 22 2 81 88 infovis medicine http://www.citeulike.org/user/fheintz/article/432458 <i>Annals of Mathematics and Artificial Intelligence, Vol. 28, No. 1-4. (2000), pp. 47-106.</i> Temporal representation and reasoning in artificial intelligence: Issues and approaches Luca Chittaro Angelo Montanari Annals of Mathematics and Artificial Intelligence, Vol. 28, No. 1-4. (2000), pp. 47-106. 2005-12-11T10:52:39-00:00 2000 Annals of Mathematics and Artificial Intelligence 1012-2443 28 1-4 47 106 Kluwer Academic Publishers temporal_reasoning http://www.citeulike.org/user/erikc/article/315622 <i>(2004), pp. 61-70.</i> Automatic derivation of electronic maps from X3D/VRML worlds Lucio Ieronutti Roberto Ranon Luca Chittaro doi:10.1145/985040.985049 (2004), pp. 61-70. 2005-09-11T05:47:39-00:00 2004 61 70 ACM Press 3d games geography hci maps http://www.citeulike.org/user/erikc/article/315620 <i>(2004), pp. 40-47.</i> A visual tool for tracing users' behavior in Virtual Environments Luca Chittaro Lucio Ieronutti doi:10.1145/989863.989868 (2004), pp. 40-47. 2005-09-11T05:43:36-00:00 2004 40 47 ACM Press 3d children evaluation hci heritage virtual http://www.citeulike.org/user/erikc/article/315601 <i>(2004), pp. 267-274.</i> 3D location-pointing as a navigation aid in Virtual Environments Luca Chittaro Stefano Burigat doi:10.1145/989863.989910 (2004), pp. 267-274. 2005-09-11T05:12:57-00:00 2004 267 274 ACM Press 3d hci http://www.citeulike.org/user/erikc/article/315599 <i>(2002), pp. 145-154.</i> Dynamic generation of personalized VRML content: a general approach and its application to 3D e-commerce Luca Chittaro Roberto Ranon doi:10.1145/504502.504526 (2002), pp. 145-154. 2005-09-11T05:11:04-00:00 2002 145 154 ACM Press 3d hci