On distributed data processing in data grid architecture for a virtual repository

The article describes the problem of integration of distributed, heterogeneous and fragmented collections of data with application of the virtual repository and the data grid concept. The technology involves: wrappers enveloping external resources, a virtual network (based on the peer-topeer technology) responsible for integration of data into one global schema and a distributed index for speeding-up data retrieval. Authors present a method for obtaining data from heterogeneously structured external databases and then a procedure of integration the data to one, commonly available, global schema. The core of the described solution is based on the Stack-Based Query Language (SBQL) and virtual updatable SBQL views. The system transport and indexing layer is based on the P2P architecture

Architektura gridu bazodanowego oparta o podejście peer-to-peer

W artykule autorzy przedstawiają zaimplementowane i zweryfikowane poprzez w pełni funkcjonalny prototyp, podejście do realizacji obiektowego gridu bazodanowego przy wykorzystaniu wirtualnej sieci peer-to-peer omawiając szczegółowo najważniejszy element mechanizmu jakim jest proces integracji rozproszonych obiektów. W artykule przeprowadzono gruntowną analizę rozwiązań będących fundamentalnym zbiorem wiedzy na temat integracji danych. Zaprezentowano trójwarstwowy model intagracyjny oparty o aktualizowalne obiektowe perspektywy oraz prototyp gridowej warstwy pośredniej wykorzystującej sieć wirtualną peer-to-peer.In the article authors present an approach for realisation of object-oriented database grid using virtual peer-to-peer networking. The approach has been verified by implementation of fully functional prototype. The article shows in details a process for integration of distributed objects which is provided by the core mechanism of the prototype. Authors also described three-layer integration model based on obiect-oriented updateable views and middleware prototype containing mentioned peer-to-peer solution. Moreover the article contains analysis of solutions being the fundamental knowledge about integration of data

CHORUS Deliverable 2.2: Second report - identification of multi-disciplinary key issues for gap analysis toward EU multimedia search engines roadmap

After addressing the state-of-the-art during the first year of Chorus and establishing the existing landscape in multimedia search engines, we have identified and analyzed gaps within European research effort during our second year. In this period we focused on three directions, notably technological issues, user-centred issues and use-cases and socio- economic and legal aspects. These were assessed by two central studies: firstly, a concerted vision of functional breakdown of generic multimedia search engine, and secondly, a representative use-cases descriptions with the related discussion on requirement for technological challenges. Both studies have been carried out in cooperation and consultation with the community at large through EC concertation meetings (multimedia search engines cluster), several meetings with our Think-Tank, presentations in international conferences, and surveys addressed to EU projects coordinators as well as National initiatives coordinators. Based on the obtained feedback we identified two types of gaps, namely core technological gaps that involve research challenges, and “enablers”, which are not necessarily technical research challenges, but have impact on innovation progress. New socio-economic trends are presented as well as emerging legal challenges

Enhancing blockchain interoperability and intraoperability capabilities in collaborative enterprise-a standardized architecture perspective

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Grid-based semantic integration of heterogeneous data resources: Implementation on a HealthGrid

This thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel University.The semantic integration of geographically distributed and heterogeneous data resources still remains a key challenge in Grid infrastructures. Today's mainstream Grid technologies hold the promise to meet this challenge in a systematic manner, making data applications more scalable and manageable. The thesis conducts a thorough investigation of the problem, the state of the art, and the related technologies, and proposes an Architecture for Semantic Integration of Data Sources (ASIDS) addressing the semantic heterogeneity issue. It defines a simple mechanism for the interoperability of heterogeneous data sources in order to extract or discover information regardless of their different semantics. The constituent technologies of this architecture include Globus Toolkit (GT4) and OGSA-DAI (Open Grid Service Architecture Data Integration and Access) alongside other web services technologies such as XML (Extensive Markup Language). To show this, the ASIDS architecture was implemented and tested in a realistic setting by building an exemplar application prototype on a HealthGrid (pilot implementation). The study followed an empirical research methodology and was informed by extensive literature surveys and a critical analysis of the relevant technologies and their synergies. The two literature reviews, together with the analysis of the technology background, have provided a good overview of the current Grid and HealthGrid landscape, produced some valuable taxonomies, explored new paths by integrating technologies, and more importantly illuminated the problem and guided the research process towards a promising solution. Yet the primary contribution of this research is an approach that uses contemporary Grid technologies for integrating heterogeneous data resources that have semantically different. data fields (attributes). It has been practically demonstrated (using a prototype HealthGrid) that discovery in semantically integrated distributed data sources can be feasible by using mainstream Grid technologies, which have been shown to have some Significant advantages over non-Grid based approaches

An Autonomic Cross-Platform Operating Environment for On-Demand Internet Computing

The Internet has evolved into a global and ubiquitous communication medium interconnecting powerful application servers, diverse desktop computers and mobile notebooks. Along with recent developments in computer technology, such as the convergence of computing and communication devices, the way how people use computers and the Internet has changed people´s working habits and has led to new application scenarios. On the one hand, pervasive computing, ubiquitous computing and nomadic computing become more and more important since different computing devices like PDAs and notebooks may be used concurrently and alternately, e.g. while the user is on the move. On the other hand, the ubiquitous availability and pervasive interconnection of computing systems have fostered various trends towards the dynamic utilization and spontaneous collaboration of available remote computing resources, which are addressed by approaches like utility computing, grid computing, cloud computing and public computing. From a general point of view, the common objective of this development is the use of Internet applications on demand, i.e. applications that are not installed in advance by a platform administrator but are dynamically deployed and run as they are requested by the application user. The heterogeneous and unmanaged nature of the Internet represents a major challenge for the on demand use of custom Internet applications across heterogeneous hardware platforms, operating systems and network environments. Promising remedies are autonomic computing systems that are supposed to maintain themselves without particular user or application intervention. In this thesis, an Autonomic Cross-Platform Operating Environment (ACOE) is presented that supports On Demand Internet Computing (ODIC), such as dynamic application composition and ad hoc execution migration. The approach is based on an integration middleware called crossware that does not replace existing middleware but operates as a self-managing mediator between diverse application requirements and heterogeneous platform configurations. A Java implementation of the Crossware Development Kit (XDK) is presented, followed by the description of the On Demand Internet Computing System (ODIX). The feasibility of the approach is shown by the implementation of an Internet Application Workbench, an Internet Application Factory and an Internet Peer Federation. They illustrate the use of ODIX to support local, remote and distributed ODIC, respectively. Finally, the suitability of the approach is discussed with respect to the support of ODIC

A baseband wireless spectrum hypervisor for multiplexing concurrent OFDM signals

The next generation of wireless and mobile networks will have to handle a significant increase in traffic load compared to the current ones. This situation calls for novel ways to increase the spectral efficiency. Therefore, in this paper, we propose a wireless spectrum hypervisor architecture that abstracts a radio frequency (RF) front-end into a configurable number of virtual RF front ends. The proposed architecture has the ability to enable flexible spectrum access in existing wireless and mobile networks, which is a challenging task due to the limited spectrum programmability, i.e., the capability a system has to change the spectral properties of a given signal to fit an arbitrary frequency allocation. The proposed architecture is a non-intrusive and highly optimized wireless hypervisor that multiplexes the signals of several different and concurrent multi-carrier-based radio access technologies with numerologies that are multiple integers of one another, which are also referred in our work as radio access technologies with correlated numerology. For example, the proposed architecture can multiplex the signals of several Wi-Fi access points, several LTE base stations, several WiMAX base stations, etc. As it able to multiplex the signals of radio access technologies with correlated numerology, it can, for instance, multiplex the signals of LTE, 5G-NR and NB-IoT base stations. It abstracts a radio frequency front-end into a configurable number of virtual RF front ends, making it possible for such different technologies to share the same RF front-end and consequently reduce the costs and increasing the spectral efficiency by employing densification, once several networks share the same infrastructure or by dynamically accessing free chunks of spectrum. Therefore, the main goal of the proposed approach is to improve spectral efficiency by efficiently using vacant gaps in congested spectrum bandwidths or adopting network densification through infrastructure sharing. We demonstrate mathematically how our proposed approach works and present several simulation results proving its functionality and efficiency. Additionally, we designed and implemented an open-source and free proof of concept prototype of the proposed architecture, which can be used by researchers and developers to run experiments or extend the concept to other applications. We present several experimental results used to validate the proposed prototype. We demonstrate that the prototype can easily handle up to 12 concurrent physical layers

Self-organizing distributed digital library supporting audio-video

The StreamOnTheFly network combines peer-to-peer networking and open-archive principles for community radio channels and TV stations in Europe. StreamOnTheFly demonstrates new methods of archive management and personalization technologies for both audio and video. It also provides a collaboration platform for community purposes that suits the flexible activity patterns of these kinds of broadcaster communities

Language Resource Infrastructure(s)

Non esiste una sola Infrastruttura di Risorse Linguistiche, ma molte infrastrutture e tutte tra loro diverse, anche se con aspetti comuni. Il motivo del plurale, la (s), nel titolo della tesi è esattamente questo. La comunità dei linguisti è molto variegata: studiosi di scienze sociali ed umane sono linguisti, come linguisti sono quelli che direttamente si occupano di (o forniscono consulenze in) ambiti molto più tecnici come la traduzione automatica, l'estrazione di informazioni da testi, il question-answering fino ai motori di ricerca presenti sul Web. Ogni sotto comunità linguistica ha le proprie esigenze da richiedere ad una Infrastruttura di Risorse Linguistiche: disponibilità di risorse, possibilità di scaricare liberamente software normalmente a pagamento, presenza di commenti e valutazioni sulle risorse disponibili ed ancora altro. Possiamo affermare che, spesso, sono i requisiti utenti a guidare il design architetturale ed il modello delle infrastrutture, mentre le tecnologie più prettamente informatiche sono usate per trovare soluzioni a tali requisiti. A conferma di questo aspetto, possiamo citare due progetti europei, METANET e PANACEA: il primo è volto alla creazione di un network di repository di tool e dati languistici accessibili da una più ampia comunità di linguisti, mentre il secondo è una piattaforma volta alla creazione di un network di risorse linguistiche in ambito multilingue e della Machine Translation, pensato per essere usato da industrie in tali ambiti. Entrambi i progetti hanno la comunità dei linguisti come promotori (provider di servizi linguistici) ma diverse comunità di utenti esterni a cui i servizi sono rivolti (consumer). METANET ha come consumer ancora la comunità dei linguisti computazionali, mentre PANACEA ha la comunità di industrie legate alla Machine Translation come comunità consumer. La diversità degli utenti finali porta a diversi requisiti utente e, quindi, a caratteristiche dierenti nelle infrastrutture. In questa tesi descriviamo sia gli aspetti comuni che specifici delle Infrastrutture di Risorse Linguistiche e mettiamo in risalto il nostro apporto alla progettazione ad alto livello delle infrastrutture di entrambi i progetti. Nello specifico riportiamo i nostri contributi nell'ambito della definizione dei moduli architetturali connessi alla autenticazione ed autorizzazione, e più in generale alla gestione degli utenti, ed al loro accesso alle risorse linguistiche. We have added an "(s)" to the title of this thesis because there is not a single one "Language Resource Infrastructure" but many Language Resource Infrastructures. In fact, the language resource infrastructures are all partially alike, since they have many common aspects, but every single language resource infrastructure is peculiar in its own way, since it has its own distinguishing characteristics. The community of linguists is very wide-ranging: human and social science scientists are linguists, as linguists are those who work in more technical environments such as Machine Translation, Information Extraction, Question-Answering, search engines and technologies available on the Web. Each sub community wants that the Language Resource Infrastructures will address its own requirements: resource availability, free download of resources normally available for-fee, feedback, comments on language resources, evaluation of language resources and so on. We can say that user requirements drive the designing and modeling of the infrastructures more than information technology, whose experts are asked to solve issues and provide solution for the user requirements. To confirm this aspect, we can cite two European projects, METANET and PANACEA: the former aims at building a network of repositories of language resources and technologies widely available for an increasing linguistic community, while the latter is a platform designed for the lexical acquisition and managing multilingualism and Machine Translation issues for small and medium enterprises focused on such topics. Both projects have the language resource community as internal users, that is to say, as providers of language services, but a different target with respect to the consumers of language resources and services. METANET is a project made by computational linguists for (computational) linguists, while PANACEA provides services for the Machine Translation industrial community. As a consequence, different requirements have led to different language resource infrastructures. In this thesis we describe both common and specific aspects of Language Resource Infrastructures and point out our contribution to the modeling of the high level architecture of the infrastructure in both projects. In particular, we report our contribution in the area of Access and Identity Management, specifically in the user management and his/her access to language resource