Gesture salience as a hidden variable for coreference resolution and keyframe extraction
Published in:
Journal of Artificial Intelligence Research
Volume 31 Issue 1, January 2008
AI Access Foundation , USA
2008 Article
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, 9 October 2008, Pages
Internet traffic modeling by means of Hidden Markov Models
, , , , , , , , , , , a Department of Computer Science and Systems, University of Naples &Federico II&, Via Claudio 21, 80125 Napoli, Italyb Department of Electronics and Telecommunications, Norwegian University of Science and Technology, O.S. Bragstads plass 2B, 7491 Trondheim, Norwayc Department of Information Engineering, Second University of Naples, Via Roma 29, 81031 Aversa (CE), ItalyIn this work, we propose a Hidden Markov Model for Internet traffic sources at packet level, jointly analyzing Inter Packet Time and Packet Size. We give an analytical basis and the mathematical details regarding the model, and we test the flexibility of the proposed modeling approach with real traffic traces related to common Internet services with strong differences in terms of both applications/users and protocol behavior: SMTP, HTTP, a network game, and an instant messaging platform. The presented experimental analysis shows that, even maintaining a simple structure, the model is able to achieve good results in terms of estimation of statistical parameters and synthetic series generation, taking into account marginal distributions, mutual, and temporal dependencies. Moreover we show how, by exploiting such temporal dependencies, the model is able to perform short-term prediction by observing traffic from real sources.Alberto Dainotti is Ph.D. student in Computer Engineering and Systems at the Computer Science Department of University of Napoli &Federico II&, Italy, where he received the M.S. Laurea Degree in Computer Engineering in 2004. His research interests fall in the areas of network measurements, traffic analysis, and network security.Antonio Pescap& is Assistant Professor at the Department of Computer Engineering and Systems of the University of Napoli Federico II. He received the M.S. Laurea Degree in Computer Engineering and the Ph.D. in Computer Engineering and Systems at University of Napoli Federico II. His research interests are in the networking field with focus on models and algorithms for Internet Traffic, Network Measurement and Management of heterogeneous IP networks, and Network Security. He has co-authored a large number of journal and conference publications. He is IEEE member and he has served and serves on several conference technical program committees (IEEE Globecom, IEEE ICC, IEEE WCNC, IEEE HPSR, etc.) and has served as Guest Editor of the Special Issue of Computer Networks on &Traffic classification and its applications to modern networks&.Pierluigi Salvo Rossi was born in Naples, Italy, on April 26, 1977. He received the &Laurea& degree in Telecommunications Engineering (summa cum laude) in January 2002 and the Ph.D. in Computer Science in January 2005, both from the University of Naples &Federico II&, Naples, Italy. In 2002, he worked as a Research Engineer at the CIRASS (Interdepartmental Research Center for Signal Analysis and Synthesis), University of Naples &Federico II&, Naples, Italy. In 2003, he worked as Research Engineer at the Department of Information Engineering, Second University of Naples, Aversa (CE), Italy. In 2004, he was Visiting Research Engineer at the CSPL (Communications and Signal Processing Laboratory), Electrical and Computer Engineering Department, Drexel University, Philadelphia, PA, US. In 2005, he worked as Postdoc Research Engineer at the ITeM (Multimedia Information and Telematic National Laboratory), CINI (Italian University Consortium for Computer Science and Engineering), Naples, Italy. In 2006, he worked as Postdoc Research Engineer at the CRdC&ICT (Regional Institute for Research on Information and Communication Technology), Benevento, Italy. He is currently a Postdoc Research Engineer at the Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, Norway. Since 2004, he is Adjunct Professor at the Second University of Naples, Aversa (CE) Italy. His research interests fall within the areas of speech processing, communication system modeling, wireless communications.Francesco Palmieri received his Laurea in Ingegneria Elettronica cum laude from Universit& degli Studi di Napoli Federico II, Italy, in 1980. In 1983, he was awarded a Fulbright scholarship to conduct graduate studies at the University of Delaware, Newark, where he received a M.S. degree in applied sciences and a Ph.D. in electrical engineering in 1985 and 1987, respectively. In 1981, he served as a 2nd Lieutenant in the Italian Army in fullfillment of draft duties. In 1982 and 1983, he was with the ITT firms: FACE SUD Selettronica in Salerno (currently Alcatel), Italy, and Bell Telephone Manufacturing Company in Antwerpen, Belgium, as a designer of digital telephone systems. He was appointed Assistant Professor in Electrical and Systems Engineering at the University of Connecticut, Storrs, in 1987, where he was awarded tenure and promotion to associate professor in 1993. In the same year, after a national competition, he was awarded the position of Professore Associato at the Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni at Universit& degli Studi di Napoli Federico II, Italy, where he has been until October 2000. In February 2000, he was nominated Professore Ordinario di Telecomunicazioni after a national competition and appointed in November 2000 at Dipartimento di Ingegneria dell?Informazione, Seconda Universit& di Napoli, Aversa, Italy. His reaserch interests are in the areas of signal processing, communications, information theory and neural networks.Giorgio Ventre is Professor of Computer Networks in the Department of Computer Engineering and Systems of the University of Napoli Federico II, where he is leader of the COMICS team. COMICS stands for Computers for Interaction and Communications and is a research initiative in the areas of networking and multimedia communications. After started ITEM, the first research laboratory of the Italian University Consortium for Informatics (CINI), He is now President and CEO of CRIAI, a research company active in the areas of Information Technologies. As leader of the networking research group at University of Napoli Federico II. He is principal investigator for several national and international research projects. His research interests are in the area of network protocols and architectures. He has co-authored more than 150 publications and he is member of the IEEE and of the ACM.
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