Esta revisão cobre os principais eixos de pesquisa desenvolvidos nas Universidades Livres de Bruxelas entre 1961 e 2001. Primeiro, introduzimos os conceitos desenvolvidos no campo das reações de quebra das ligações carbono-estanho em compostos RR’R”R”’Sn usando reagentes E-N, obtendo-se R-E e R’R”R”’SnN, em solventes nucleofilos e não nucleofilos. A adição do nucleofilo ao íon metálico é necess...

In a BGP prefix hijacking event, a router originates a route to a prefix, but does not provide data delivery to the actual prefix. Prefix hijacking events have been widely reported and are a serious problem in the Internet. This paper presents a new Prefix Hijack Alert System (PHAS). PHAS is a real-time notification system that alerts prefix owners when their BGP origin changes. By providing re...

Border Gateway Protocol, an important inter-domain routing protocol, has a number of vulnerabilities. Little is known about how BGP actually performs in today’s Internet. We designed a framework, BGP Assistant, to monitor and analyze BGP traffic. Number of BGP Updates and Route convergence time are used to characterize BGP behavior. Preliminary results with the Oregon Route Views BGP show that ...

In this paper we describe a prototype implementation of updateable views called “SBQL Views”. The prototype follows a novel approach to view updates based on the Stack-Based Approach to object-oriented and XMLoriented query languages. The SBQL Views prototype is implemented on top of the SBQL query language for the XML DOM model. The novelty of the approach consists in augmenting a view definit...

the kind of attitude to mulla sadra’s works is important in deducing his views accurately. here, there are two types of attitudes. first, the real sadra’s views are what we understand literally from his assertions. the second is that the deduction of his final ideas needs some philosophical independent judgment (ijtihad) in addition to what is understood literally from his assertions and other ...

On the inter-domain Internet today, the address prefix origin in our BGP operations has become a major security concern. This critical problem can be stated simply as “Is the originating Autonomous System (AS) authorized to advertise the destination address prefix?” In the long term maybe we will be able to prevent this problem by applying proposed solutions such as SBGP[1] or SoBGP[2]. However...

Goal of the SAM-Grid / LCG interoperability project is making available to DZero the resources provided by the LHC Computing Grid (LCG) through the SAM-Grid system. In the months between March and June, the collaboration has put in place a “proof-of-principle” test bed, which demonstrated the feasibility of the integration project. The trip to Lyon was an intensive, strict collaboration with th...

It is commonly recognized that the Internet routing and addressing architecture is facing challenges in scalability, multihoming, and inter-domain traffic engineering. In this paper we study real aggregation (RA), which is a routing compression method by suppressing redundant RA prefixes of Routing Information Base (RIB). RA method can be used as a short-term solution because it does not requir...

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays in the data of the High Resolution Fly’s Eye (HiRes) collaboration, and local large scale structure. The HiRes stereo data set (the same used to search for AGN correlations [1]) was used in the search, and the 2 Micron All-Sky Redshift Survey (2MRS) was used to determine the density of galaxies in ...