Sistemi Distribuiti Principi E Paradigmi

Autore: Andrew S. Tanenbaum
Editore: Pearson Italia S.p.a.
ISBN: 9788871923666
Grandezza: 19,27 MB
Formato: PDF, Mobi
Vista: 2964
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An Introduction To Distributed Algorithms

Autore: Valmir C. Barbosa
Editore: MIT Press
ISBN: 9780262024129
Grandezza: 64,38 MB
Formato: PDF, ePub, Mobi
Vista: 8443
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An Introduction to Distributed Algorithms takes up some of the main concepts and algorithms, ranging from basic to advanced techniques and applications, that underlie the programming of distributed-memory systems such as computer networks, networks of workstations, and multiprocessors. Written from the broad perspective of distributed-memory systems in general it includes topics such as algorithms for maximum flow, program debugging, and simulation that do not appear in more orthodox texts on distributed algorithms. Moving from fundamentals to advances and applications, ten chapters—with exercises and bibliographic notes—cover a variety of topics. These include models of distributed computation, information propagation, leader election, distributed snapshots, network synchronization, self- stability, termination detection, deadlock detection, graph algorithms, mutual exclusion, program debugging, and simulation. All of the algorithms are presented in a clear, template- based format for the description of message-passing computations among the nodes of a connected graph. Such a generic setting allows the treatment of problems originating from many different application areas. The main ideas and algorithms are described in a way that balances intuition and formal rigor—most are preceded by a general intuitive discussion and followed by formal statements as to correctness complexity or other properties.

Semantic Search Over The Web

Autore: Roberto De Virgilio
Editore: Springer Science & Business Media
ISBN: 3642250084
Grandezza: 64,65 MB
Formato: PDF, ePub
Vista: 6843
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The Web has become the world’s largest database, with search being the main tool that allows organizations and individuals to exploit its huge amount of information. Search on the Web has been traditionally based on textual and structural similarities, ignoring to a large degree the semantic dimension, i.e., understanding the meaning of the query and of the document content. Combining search and semantics gives birth to the idea of semantic search. Traditional search engines have already advertised some semantic dimensions. Some of them, for instance, can enhance their generated result sets with documents that are semantically related to the query terms even though they may not include these terms. Nevertheless, the exploitation of the semantic search has not yet reached its full potential. In this book, Roberto De Virgilio, Francesco Guerra and Yannis Velegrakis present an extensive overview of the work done in Semantic Search and other related areas. They explore different technologies and solutions in depth, making their collection a valuable and stimulating reading for both academic and industrial researchers. The book is divided into three parts. The first introduces the readers to the basic notions of the Web of Data. It describes the different kinds of data that exist, their topology, and their storing and indexing techniques. The second part is dedicated to Web Search. It presents different types of search, like the exploratory or the path-oriented, alongside methods for their efficient and effective implementation. Other related topics included in this part are the use of uncertainty in query answering, the exploitation of ontologies, and the use of semantics in mashup design and operation. The focus of the third part is on linked data, and more specifically, on applying ideas originating in recommender systems on linked data management, and on techniques for the efficiently querying answering on linked data.

Principi Di Linguistica Applicata

Autore: Enrico Arcaini
Editore:
ISBN:
Grandezza: 33,63 MB
Formato: PDF, Docs
Vista: 8952
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Citt E Parchi

Autore: Luciano Fonti
Editore: Gangemi Editore spa
ISBN: 8849254555
Grandezza: 59,93 MB
Formato: PDF, Mobi
Vista: 4501
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I più recenti studi di ricerca e le ultime conferenze internazionali sul tema dei Parchi Metropolitani e Periurbani hanno sempre più posto l’accento sui rapporti di integrazione fra aree naturali protette e sistemi urbanizzati contermini e sulle positive ricadute che la pianificazione ambientale può determinare sugli interventi di riqualificazione urbana. Superata la tradizionale distinzione fra città e campagna si è reso necessario un radicale ripensamento della progettazione degli assetti e della gestione dei parchi inseriti in contesti urbanizzati, rendendo così possibili nuovi scenari caratterizzati non solo dagli aspetti paesistico – ambientali, ma soprattutto da quelli culturali, economici e funzionali di un contesto più esteso. Le aree naturali protette, per le specifiche risorse che offrono e per le molteplici potenzialità d’uso, possono svolgere un ruolo fondamentale: quello di ridefinire i rapporti fra conservazione, valorizzazione della natura e riqualificazione urbana. Questo testo si propone non tanto di suggerire una soluzione a tutte le problematiche che possono derivare da questo tipo di impostazione del problema, quanto di presentare di una serie di esperienze di ricerca che si propongono di offrire riflessioni e spunti di approfondimento quale possibile inquadramento per soluzioni più complete e avanzate.

Computer Networking

Autore: James F. Kurose
Editore: Prentice Hall
ISBN: 9780131365483
Grandezza: 57,82 MB
Formato: PDF
Vista: 4380
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Building on the successful top-down approach of previous editions, this edition continues with an early emphasis on application-layer paradigms and application programming interfaces, encouraging a hands-on experience with protocols and networking concepts.

Atene E Roma

Autore:
Editore:
ISBN:
Grandezza: 56,19 MB
Formato: PDF, ePub, Docs
Vista: 1431
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Field Based Coordination For Pervasive Multiagent Systems

Autore: Marco Mamei
Editore: Springer Science & Business Media
ISBN: 3540279695
Grandezza: 24,66 MB
Formato: PDF, Kindle
Vista: 8980
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More and more, software systems involve autonomous and distributed software components that have to execute and interact in open and dynamic environments, such as in pervasive, autonomous, and mobile applications. The requirements with respect to dynamics, openness, scalability, and decentralization call for new approaches to software design and development, capable of supporting spontaneous configuration, tolerating partial failures, or arranging adaptive reorganization of the whole system. Inspired by the behaviour of complex natural systems, scientists and engineers have started to adjust their mechanisms and techniques for self-organization and adaption to changing environments. In line with these considerations, Mamei and Zambonelli propose an interaction model inspired by the way masses and particles in our universe move and self-organize according to contextual information represented by gravitational and electromagnetic fields. The key idea is to have the components’ actions driven by computational force fields, generated by the components themselves or by some infrastructures, and propagated across the environment. Together with its supporting middleware infrastructure – available with additional information under http://www.agentgroup.unimore.it – this model can serve as the basis for a general purpose and widely applicable approach for the design and development of adaptive distributed applications.