PP-trust-X Squicciarini, A.; Bertino, E.; Ferrari, Elena ...
ACM transactions on information and system security,
07/2007, Letnik:
10, Številka:
3
Journal Article
Trust negotiation is a promising approach for establishing trust in open systems, in which sensitive interactions may often occur between entities with no prior knowledge of each other. Although, to ...date several trust negotiation systems have been proposed, none of them fully address the problem of privacy preservation. Today, privacy is one of the major concerns of users when exchanging information through the Web and thus we believe that trust negotiation systems must effectively address privacy issues in order to be widely applicable. For these reasons, in this paper, we investigate privacy in the context of trust negotiations. We propose a set of privacy-preserving features for inclusion in any trust negotiation system, such as the support for the P3P standard, as well as a number of innovative features, such as a novel format for encoding digital credentials specifically designed for preserving privacy. Further, we present a variety of interoperable strategies to carry on the negotiation with the aim of improving both privacy and efficiency.
Group-Based Negotiations in P2P Systems Squicciarini, A C; Paci, F; Bertino, E ...
IEEE transactions on parallel and distributed systems,
10/2010, Letnik:
21, Številka:
10
Journal Article
Recenzirano
In P2P systems, groups are typically formed to share resources and/or to carry on joint tasks. In distributed environments formed by a large number of peers conventional authentication techniques are ...inadequate for the group joining process, and more advanced ones are needed. Complex transactions among peers may require more elaborate interactions based on what peers can do or possess instead of peers' identity. In this work, we propose a novel peer group joining protocol. We introduce a highly expressive resource negotiation language, able to support the specification of a large variety of conditions applying to single peers or groups of peers. Moreover, we define protocols to test such resource availability customized to the level of assurance required by the peers. Our approach has been tested and evaluated on an extension of the JXTA P2P platform. Our results show the robustness of our approach in detecting malicious peers, detected both during the negotiation and during the peer group lifetime. Regardless of the peer group cardinality and interaction frequency, the peers always detect possible free riders within a small time frame.
Protection of residual beta cell function at the time of diagnosis of insulin-dependent diabetes mellitus (IDDM) by intensive insulin therapy and the addition of nicotinamide (NA) has been ...established. The objective of this study was to evaluate the effect of a free oxygen radical scavenger such as vitamin E (Vit E) on residual beta cell function and parameters of metabolic control in patients with recent onset IDDM undergoing intensive insulin therapy.
The effect of Vit E was compared with that of NA (control group) in a randomized multicentre trial.
Eighty-four IDDM patients between 5 and 35 years of age (mean age 15.8 +/- 8.4 (s.d.) years) entered a one year prospective study. One group of patients (n = 42) was treated with Vit E (15 mg/kg body weight/day) for one year; the other group (n = 42) received NA for one year (25 mg/kg body weight/day). All patients were under intensive insulin therapy with three to four injections a day. Basal and stimulated (1 mg i.v. glucagon) C-peptide secretion, glycosylated haemoglobin and insulin dose were evaluated at diagnosis and at three-monthly intervals up to one year.
Preservation and slight increase of C-peptide levels at one year compared with diagnosis were obtained in the two treated patient groups. No statistically significant differences were observed in basal or stimulated C-peptide levels between the two groups of patients for up to one year after diagnosis. Glycosylated haemoglobin and insulin dose were also similar between the two groups; however patients receiving Vit E under the age of 15 years required significantly more insulin than NA-treated patients one year after diagnosis (P < 0.04).
Our data indicate that Vit E and NA possess similar effects in protecting residual beta cell function in patients with recent onset IDDM. Since their putative mechanism of protection on beta cell cytotoxicity is different, combination of these two vitamins may be envisaged for future trials of intervention at IDDM onset.
Young Researcher Meeting, Trieste 2013 Agostini, F; Antolini, C; Aversa, R ...
Journal of physics. Conference series,
12/2013, Letnik:
470, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Young Researcher Meeting (www.yrmr.it) has been a rapidly growing event for the last few years. Together with other initiatives which have emerged in several research areas, the young researcher ...meeting marks the awareness and the desire of PhD students, postdoctoral fellows and young researchers to play a major role in scientific progress. Devoted to the discussion and the interchange of new developments and ideas in physics, the meeting is primarily aimed at graduate students and postdoctoral researchers, who are encouraged to present their work in an informal atmosphere. One of the main purposes of the conference is to create an international network of young researchers, both experimentalists and theorists, and fruitful collaborations across the different branches of physics. Born in Rome in 2009, after three editions that strengthened it, the Young Researcher Meeting 2013 was held in Trieste. Propelled by the past success, the fourth meeting was a two-day conference on 3–4June. It was sponsored by the International School for Advanced Studies – SISSA – and the University of Padova, thus acquiring an even further international drive. In this volume, we collect some of the contributions that were presented at the conference. They cover topics in astrophysics and cosmology, particle and theoretical physics, soft and condensed matter, biophysics and medical physics. YRM Organising and Editorial Committee Fabio Agostini (fabio.agostini@roma2.infn.it) Dipartimento di Fisica, Università di Roma 'Tor Vergata' Via della Ricerca Scientifica 1, 00133 Roma, Italy Claudia Antolini (claudia.antolini@sissa.it) SISSA - Scuola Internazionale Superiore di Studi Avanzati Via Bonomea 265, 34136 Trieste, Italy Rossella Aversa (raversa@sissa.it) SISSA - Scuola Internazionale Superiore di Studi Avanzati Via Bonomea 265, 34136 Trieste, Italy Giordano Cattani (giordano.cattani@gmail.com) Matteo Martinelli (mmartin@sissa.it) SISSA - Scuola Internazionale Superiore di Studi Avanzati Via Bonomea 265, 34136 Trieste, Italy Luca Mazzaferro (luca.mazzaferro@roma2.infn.it) Dipartimento di Fisica, Università di Roma 'Tor Vergata' Via della Ricerca Scientifica 1, 00133 Roma, Italy Marina Migliaccio (mm858@ast.cam.ac.uk) Institute of Astronomy and Kavli Institute for Cosmology Madingley Road, CB3 0HA Cambridge, United Kingdom Francesco Paci (fpaci@sissa.it) SISSA - Scuola Internazionale Superiore di Studi Avanzati Via Bonomea 265, 34136 Trieste, Italy Davide Pietrobon (davide.pietrobon@jpl.nasa.gov) California Institute of Technology - Jet Propulsion Laboratory 4800 Oak Grove Drive 169-237 91109 Pasadena, CA, USA Daniel Ricci Pacifici (Daniel.Ricci.Pacifici@pd.infn.it) Dipartimento di Fisica e Astronomia, Università degli Studi di Padova INFN, Sezione di Padova Via Marzolo 8, 35131, Padova, Italy Francesco Stellato (francesco.stellato@cfel.de) Center for Free-Electron Laser Science, DESY Notkestrase 85, 22607 Hamburg, Germany Marcella Veneziani (marcella@ipac.caltech.edu) Infrared Processing and Analysis Center California Institute of Technology 1200 E California Blvd, Pasadena, CA 91125, USA Acknowledgments The organizers of the 4th Young Researcher Meeting, held in Trieste, would like to thank all the scientists who participated in the meeting. We thank the International School for Advanced Studies (SISSA) for hosting the conference, covering the organization costs and allowing some travel grants for the speakers. We are greateful to Professor Guido Martinelli, director of SISSA, for his valuable support and advice. The publication of the proceedings of the conference is sponsored by the Padova university project CPDA119349 (P I Professor Marco Matone). The event was broadcast live by OggiScienza (http://oggiscienza.wordpress.com).
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