SIRIO: One year of station keeping

The strategy followed in maintaining the station point and the results achieved are described. The method used for orbit determination is presented. Azimuth and elevation data from SHF antennas were used as input for the determination. An estimation of the uncertainty of the orbit was given and a comparison was made between determinations performed using the method here described and determinations performed using VHF ranging data. Also, the difference in using data from a single SHF station or two stations was shown. In the area of attitude determination, a study was carried out for predicting the spacecraft spin axis precession. The model used was explained and then the agreement between predicted and measured attitude outlined

Internet Security: Report on ICANN\u27s Initiatives and on the Discussions in the European Union

The Internet is designed as a highly distributed system, with very few single points of control or failure. The computers that interconnect all the networks world-wide are consequently very numerous and widely distributed globally. They are also owned and controlled by many distinct organisations and individuals. Consequently, general co-ordination of the Internet, and a fortiori security, depends on widespread co-operation. One major objective of the distributed architecture of the Internet is precisely that of insulating the networks as a whole from any particular failure. Indeed, as seen, the Internet responded to the 9/11 events very robustly, particularly in the United States and Europe, the loss of a major telecommunications facility adjoining the WTC notwithstanding. But this may not have been the case in more peripheral parts of the Internet; South Africa reported a significant and prolonged outage at the time. However, certain Internet functions are centralised due to the necessity of unique assignments of names, addresses and protocols. These are the functions that are under the auspices of ICANN itself. Accordingly, should there be vulnerabilities and failures in the future, they might occur in these particular areas.

ANALISI DELLE POSIZIONI ESPRESSE DURANTE L\u27INTERNET GOVERNANCE FORUM 2009 IN MERITO ALL\u27EVOLUZIONE DELLA "ENHANCED COOPERATION" E ALLA PROPOSTA DI ESTENDERE IL MANDATO DEL FORUM

Available in ItalianIl processo quinquennale dell\u27IGF iniziato nel 2006, e il piano per la enhanced cooperation sulla IG costituirono il risultato pi? rilevante e concreto del secondo Summit mondiale sulla Societ? dell\u27Informazione del 2005. A quattro anni dalla partenza dell\u27IGF il mondo della Rete sta guadagnando una maggiore coscienza e visione globale della Internet governance, cos? come il coinvolgimento in modo paritario delle diverse organizzazioni che sono attive sugli aspetti di gestione del sistema Internet sembra sempre pi? vicino. L\u27eventuale estensione temporale del mandato dell\u27IGF e la possibilit? di inserire fra i temi in discussione dei prossimi Forum la stessa questione della enhanced cooperation sono stati argomenti centrali di discussione al quarto IGF globale di Sharm el Sheikh. Mentre da una parte la Commissione ONU sulla Science and Technology for Development (CSTD) sta verificando i risultati delle diverse azioni derivate dal WSIS, che includono quindi anche le questione della Internet Governance, dall\u27altra le diplomazie stanno lavorando affinch? alla prossima Assemblea Generale ONU, prevista per settembre 2010, il mandato dell\u27IGF sia esteso per un ulteriore quinquennio. Gli autori riportano - attraverso le posizioni che sono state espresse al Forum - che sul tema dell\u27estensione del mandato dell\u27IGF si e\u27 riscontrata una sostanziale concordia: il processo dello IGF ha favorito importanti progressi che potranno essere migliorati con meccanismi multistakeholder sempre pi? forti e con una maggiore apertura delle organizzazioni internazionali che hanno influenza nelle discussioni e decisioni sulla IG

Internet security report on ICANN\u27s initiatives and on the discussions in the European Union

No abstract availabl

Development of research networking in Africa: the point of view of the RINAF technical support unit established in Pisa

The RINAF (Regional Informatics Network for Africa) project, conceived by UNESCO\u27s Intergovernmental Informatics Programme (IIP) in 1989 and mainly financed by the Italian Government, is aimed at supporting the interconnection of academic and research institutions within Africa and to the international research community through the provision of computer equipment, basic network services and training activities. Starting from a description of the project status, this paper gives an evaluation of the changing network environment in Africa and of its impact, providing some remarks on the set up of an independent African management capacity for research networks

Prey Coat Color Selection and Bioenergetics of Captive Screech Owls

Author Institution: The Institute of Environmental Sciences and Department of Zoology, Miami Universit