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Nordio A.,CNR Institute of Electronics, Computer and Telecommunication Engineering | Chiasserini C.-F.,Polytechnic University of Turin
IEEE Transactions on Signal Processing | Year: 2011

Environmental monitoring is often performed through wireless sensor networks, by randomly deploying sensor nodes over the geographical region of interest. Sensors sample a physical phenomenon (the so-called field) and send their measurements to a sink, which is in charge of reconstructing the field from such irregular samples. In this work, we focus on scenarios of practical interest where the sensor deployment is unfeasible in certain areas of the geographical region (e.g., due to terrain asperities), and the delivery of sensor measurements to the sink may fail (e.g., due to fading or to transmission collisions among sensors simultaneously accessing the wireless medium). Under these conditions, we carry out an asymptotic analysis and evaluate the quality of the estimation of a field defined over a d-dimensional domain (d≥1) when the sink uses linear filtering as a reconstruction technique. Specifically, given the matrix V representing the sampling system, we let the size of V go to infinity and its aspect ratio have a finite limit bounded away from zero. Then, we provide both the moments and density of the limiting spectral distribution of VV H, in terms of those obtained when the samples collected by the sink correspond to locations that are uniformly distributed over the geographical area. By using such asymptotic results, we approximate the mean square error on the estimated field through the η-transform of VV H, and we derive the sensor network performance under the conditions described above. © 2011 IEEE. Source

Veruggio G.,CNR Institute of Electronics, Computer and Telecommunication Engineering
IEEE Robotics and Automation Magazine | Year: 2010

Roboethics is the word officially used for the first time in 2004, in Sanremo, Italy, at the First International Symposium on Roboethics. The event proposed a technical committee (TC) on roboethics, with the aim of providing the IEEE Robotics and Automation Society (RAS) with a framework for supporting the establishment of shared tools for managing new and ethical issues. The 2005 International Conference on Robotics and Automation (ICRA) organized by TC in Barcelona, Spain, placed emphasis on the subject of roboethics. These events have found that roboethics is crucial not only for the society as a whole but also for the technoscientific development of robotics. The prospective ability of learning in personal robots underlines the theoretical and practical limitation in our ability to explain, predict, and control the behavior of autonomous learning robots in their interactions with humans. Source

Ishii H.,Tokyo Institute of Technology | Tempo R.,CNR Institute of Electronics, Computer and Telecommunication Engineering
IEEE Transactions on Automatic Control | Year: 2010

In the search engine of Google, the PageRank algorithm plays a crucial role in ranking the search results. The algorithm quantifies the importance of each web page based on the link structure of the web. We first provide an overview of the original problem setup. Then, we propose several distributed randomized schemes for the computation of the PageRank, where the pages can locally update their values by communicating to those connected by links. The main objective of the paper is to show that these schemes asymptotically converge in the mean-square sense to the true PageRank values. A detailed discussion on the close relations to the multi-agent consensus problems is also given. © 2010 IEEE. Source

Dabbene F.,CNR Institute of Electronics, Computer and Telecommunication Engineering | Gay P.,University of Turin
Computers and Electronics in Agriculture | Year: 2011

The aim of a traceability system is to collect in a rigorous way all the information related to the displacement of the different products along the supply chain. This information proves essential when facing food safety crisis, and allows efficiently managing the consequent product recall action. Although a recall action could be absolutely critical for a company, both in terms of incurred costs and of media impact, at present most companies do not posses reliable methods to precisely estimate the amount of product that would be discarded in the case of recall. The skill of limiting the quantity of recalled products to the minimum can be assumed as a measure of the performance and of the efficiency of the traceability system adopted by the company. Motivated by this consideration, this paper introduces novel criteria and methodologies for measuring and optimizing the performance of a traceability system. As opposed to previous introduced methods, which optimize indirect measures, the proposed approach takes into direct account the worst-case (or the average) quantity of product that should be recalled in the case of a crisis. Numerical examples concerning the mixing of batches in a sausage production process are reported to show the effectiveness of the proposed approach. © 2010 Elsevier B.V. Source

Valenzano A.,CNR Institute of Electronics, Computer and Telecommunication Engineering
IEEE Industrial Electronics Magazine | Year: 2014

The protection of a networked industrial control system (ICS) against cyberattacks and malicious behavior is a process that should be taken into account since the very beginning of the system?s conception. This is true, in particular, for the design and verification of access control policies that build up the core of any protection scheme. The aim of this article is to assess the general framework and shed some light on the research activities concerning the analysis and verification of access policies in ICSs, which are currently being carried out in our laboratory. © 2007-2011 IEEE. Source

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