Technical Program SSIE 2007

Monday July 2, 2007

9:00-12:30, Tutorial Session
Leonardo Badia, Institutions Markets Technologies (IMT) – Lucca Institute for Advanced Studies:
Joint Routing and Scheduling in Wireless Mesh Networks
Abstract:Wireless Mesh Networks are multi-hop networks which provide wireless connectivity between clients and the Internet through dedicated router platforms. The clients can be mobile, but the routers are usually stationary. A strong advantage of this network architecture is to be cost-effective, since cable deployment is not required. Therefore, mesh networks are particularly suitable for wide rural areas as well as office and home environments.
To effectively provide broadband connectivity, several technical issues must be addressed for mesh networking. Much of these issues involve multi-hop wireless communication. In particular, a deeply studied but also challenging problem involves the search for a cross-layer approach between scheduling and routing, so as to realize a Joint Routing and Scheduling (JRS) framework.
In this presentation, we will outline general principles of wireless mesh networking, with particular emphasis on theoretical and algorithmic aspects. Moreover, we will discuss in detail the JRS problem, for which we will review and discuss several approaches, involving various methodologies and technical factors. A significant part of the lecture will be dedicated to identifying ongoing research directions and open paths for future investigations.

14:00-15:30 Students Presentations
Pietro Cassarà, University of Palermo, Italy, ‘Models and Security ‘
Leonora Ursini, Iniversity of Padova, Italy, ‘Message hiding through chaos-based optical communications systems’

Tuesday July 3, 2007

9:00-12:30, Tutorial Session
Alberto Bononi, University of Parma, Italy
Multicanonical simulation techniques and their relation to importance sampling
Abstract: This short course will provide a tutorial introduction to the Multicanonical Monte Carlo (MMC) method, introduced by physicists Berg and Neuhaus in 1992. MMC is a truly innovative simulation technique used to estimate the probability density function (PDF) of a desired system output (scalar) variable, given the (known) PDF of the system (multidimensional) input. For example, in digital communications, the output variable can be the decision variable at the sampler, while the system random input is the ensemble of all noise samples accumulated along the transmission line, and of the random bits in the transmitted sequence that cooperate to set the value of the decision variable. The method is based on an adaptive Importance Sampling (IS) procedure, and does not need any special prior knowledge of the physical system at hand in order to find a good biasing input distribution, which is the true limit of fixed IS.
14:00-17:30 Students Presentations
Carlo Bellettini, University of Ferrara, Italy, ‘On Audio Recognition Performance Via Robust Hashing’
Marcello Caleffi, University of Naples, Italy, ‘A Reliability Approach for Multi-path Routing Performance Modeling and Analysis in Ad hoc and Mesh Networks’
Marco Fiore, Polytechnic of Turin, Italy, ‘Efficient Retrieval of User Contents in MANETs’
Domenico Ficara, University of Pisa, Italy, ‘Advanced high-performance networking applications on Network Processors’
Simone Merlin, University of Padova, Italy , ‘Multi-channel multi-radio ad-hoc networks: overview and new findings in resource allocation’

Wednesday July 4, 2007

9:00-12:30, Tutorial Session
Luca Salgarelli, University of Brescia, Italy:
Security in Wide-Area Wireless Networks: theory, practice and open issues
Abstract: Network security, besides the clear importance of the topic in the context of contemporary telecommunication networks, represents a source of several inter-disciplinary research subjects. The integration of security mechanisms in telecommunication networks requires coordinated efforts from many directions during the research, development and deployment phases. This becomes even more important when considering wide-area wireless networks, because of their considerable user base and the very stringent requirements they are subject to, such as minimal handover latency, for example.
This seminar will introduce the state of the art and main research directions for network security, with specific references to mobile networks. We will introduce the basics of network security, including topics such as efficient user and terminal authentication, the protection of privacy both for user data and for signaling and briefly touching on issues such as Intrusion Detection. We will then analyze how these issues have had an impact on the design of modern wireless networks, such as GSM, UMTS and 802.11, and how they are shaping the modeling of future mobile networks.

14:00-17:30 Students Presentations
Giampaolo Ferraioli, University of Naples ‘Parthenope’, Italy, ‘Phase Offset Estimation in Multi-Channel InSAR DEM Reconstruction’
Luca Cicala, University of Naples, Italy, ‘A Generalization of Zerotree Coding Algorithms’
Alessio Botta, IMT (Institutions Markets Technologies) Lucca, Italy, ‘Augmenting the distributed evaluation of path queries with information granules’
Alessandra Mior, University of Padova, Italy, ‘Channel Estimation in Wimax systems’

Thursday July 5, 2007

9:00-12:30, Tutorial Session
Andrea Fusiello, University of Verona, Italy
Image-Based Rendering Methods
Abstract: In Image-Based Rendering (IBR), images of a real scene are taken from various view points and novel views of the same scene are synthesized from a virtual camera by processing the real images, without the need of a full three-dimensional reconstruction. I will first introduce basic geometric concepts and algorithms on multiple-view analysis, including epipolar geometry and plane+parallax theory. I will then move to the problem of computing correspondences (or disparity) in two and more views. Disparity plays an important role in image-based rendering as a proxy for the scene geometry. Finally I will give an overview of previous work on image synthesis from real images. Different techniques are described for synthesizing novel views from real images and video streams. Throughout, the presentation will try to focus on aspects of IBR relevant for 3-D image communications.
14:00-17:30 Students Presentations
Michele Zanda, IMT Lucca, Italy, ‘Effects of Increasing Users’ Attention on Cost in Software Download Interfaces’
Nicola Baldo, University of Padova, Italy, ‘Cognitive Network Access using Fuzzy Decision Making’
Alberto Vigato, University of Padova, Italy, ‘Representation of a CPM Modulator through a Finite State Sequential Machine’
Anahita Goljahani, University of Padova, Italy, ‘Superimposed sequence channel estimation and pilot aided channel estimation in OFDM systems: a throughput comparison’
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Friday July 6, 2007

9:00-12:30, Tutorial Session
Gianfranco Dalla Betta, University of Trento, Italy
Fotorivelatori avanzati basati su diodi a valanga a singolo fotone per visione 3D e imaging medico
Abstract: In this lecture, after recalling some basic concepts about light interaction with silicon, a new generation of photodetectors will be introduced, based on Single Photon Avalanche Diodes (SPAD). Although the invention of this device dates back to the 60’s, only recently its feasibility in standard CMOS technologies has been demonstrated, a fact that has opened the way to the fabrication of 1-d and 2-d arrays with integrated electronics. The same device concept, but with a full custom fabrication technology, is expoited in silicon photomultipliers (SiPMs), which consist in a 2-d array of SPADs with integrated quenching resistors in series, having all their terminals connected in parallel, so as to obtain an analog behavior starting from an intrinsically digital device (the output signal is proportional to the number of single pixels hit by a photon). Both SPAD arrays and SiPMs lend themselves to very interesting application opportunities in several fields: among them, luminescence microscopy, fluorescence decay analysis, optical testing of high speed circuits, range measurements (3d vision) and medical imaging.

SSIE 2007 Presentations