Edgardo Ambrosi

Automatic construction of an opinion-term vocabulary for ad hoc retrieval

We present a method to automatically generate a term-opinion lexicon. We also weight these lexicon terms and use them at real time to boost the ranking with opinionated-content documents. We define very simple models both for opinion-term extraction and document ranking. Both the lexicon model and retrieval model are assessed. To evaluate the quality of the lexicon we compare performance with a well-established manually generated opinion-term dictionary. We evaluate the effectiveness of the term-opinion lexicon using the opinion task evaluation data of the TREC 2007 blog track.

The Grid Data Source Engine Batch Query System

The interest in grid-databases integration has been steadily increasing in recent years and several projects provided different grid middleware components or tools trying to face this challenge. Among them the Grid Data Source Engine is offering native access to relational and non-relational data sources in a grid environment. In this paper we present its asynchronous query mechanism and we focus on the ability of this GSI/VOMS based middleware component to be integrated in workflow management systems.

Transparent java threads migration protocol over peer2peer

The Java Virtual Machine computing model implements a multi-threading paradigm but its computing model does not define and does not verify the distribution paradigm of the threads over set of JVM instances. Without a distribution paradigm the Java Virtual Machine computing model cannot get any advantage from the theory of parallel Turing Machines. This work formally specifies and verifies the JVM computing model distribution paradigm. An intrinsic transparent thread distribution mechanism over many JVMs relying on different communication technology such as Peer to Peer is an important outcome of the presented solution. Other consequences, such as distributed JVM run-time location, aggregation and reachability, are achieved. Moreover the creation of Virtual Farms of JVMs for Multi-threading applications computing is made possible.

JASMINA: An observing behaviours experiment of java threads migration mechanisms over JXTA

An extended distribution of computations for multi threading Java applications, requires an extended communication infrastructure. Since large scientific communities wish to adopt the Java paradigm as basis language for their resource-consuming and space-consuming algorithms, then wide JVM computational farms represent an important goal. We propose an interesting experiment, called JASMINA, concerning the deploying of JVMs instances on JXTA platform. JASMINA purposes is to show the first attempt to discover, aggregating and manage a wide JVM farms over JXTA platform. We discuss about the adopted embedding of JXTA paradigm into JVM architecture, and we show some observed behaviours from the effects of JXTA properties on the execution and distribution of Java applications