- Athens, Attikí, Greece
Peer-to-peer (p2p) applications exhibit characteristics such as dynamic network topology and configuration, heterogeneity and scalability that make their development a complicated task. This is further aggravated due to the required... more
Peer-to-peer (p2p) applications exhibit characteristics such as dynamic network topology and configuration, heterogeneity and scalability that make their development a complicated task. This is further aggravated due to the required satisfaction of dependability properties, i.e. security, availability, reliability, etc. Furthermore, p2p application requirements are driven by the software architecture adopted for their development while in other kinds of applications, the requirements drive the architecture. It is therefore only natural to adopt an architecture-based approach for the development of p2p dependable applications in order to ensure at the architectural level that dependability requirements are met. An essential part for the effective architecture-based development is the use of an appropriate modelling mechanism. In this paper we argue on the use of a UML profile that provides appropriate constructs and notations for modelling dependable p2p software architectures.
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Within the currently forming pervasive computing environment services and information sources thrive. Instantiations of the service oriented computing paradigm e.g. Web, Peer-to-Peer (P2P) and Grid services are continuously emerging,... more
Within the currently forming pervasive computing environment services and information sources thrive. Instantiations of the service oriented computing paradigm e.g. Web, Peer-to-Peer (P2P) and Grid services are continuously emerging, whilst information can be collected from several information sources e.g. materialisations of the Web 2.0 and Web 3.0 trends, Social Networking apps and Sensor Networks. Within this context the development of adaptable service oriented processes utilising heterogeneous services, in addition to available information is an emerging trend. This paper presents an approach and an enabling architecture that leverage the provision of data-driven, adaptable, heterogeneous service processes. Core within the proposed architecture is a set of interacting components that accommodate the acquisition of information, the execution of service chains and their adaptation based on collected information. 1 Dissertation Summary Our era has been marked by a shift in the way...
Στο υπό εξέλιξη διαδίκτυο, όπου ανθούν οι υπηρεσίες και οι πηγές πληροφορίας, η παροχή προσαρμοζόμενων υπηρεσιοστρεφών διαδικασιών οι οποίες εκμεταλλεύονται διαθέσιμες υπηρεσίες και πληροφορίες, αποτελεί επιτακτική ανάγκη και όχι απλά... more
Στο υπό εξέλιξη διαδίκτυο, όπου ανθούν οι υπηρεσίες και οι πηγές πληροφορίας, η παροχή προσαρμοζόμενων υπηρεσιοστρεφών διαδικασιών οι οποίες εκμεταλλεύονται διαθέσιμες υπηρεσίες και πληροφορίες, αποτελεί επιτακτική ανάγκη και όχι απλά επιθυμητό χαρακτηριστικό. Στόχος των προσαρμοζόμενων διαδικασιών είναι η «χρήση διαθέσιμων πληροφοριών σχετικών με τις αλλαγές του περιβάλλοντος τους με σκοπό την βελτιστοποίηση της συμπεριφοράς τους». Στο σύνολο των τεχνικών που έχουν εφαρμοστεί ως τώρα μπορεί κανείς να αναγνωρίσει διάφορες κατηγορίες, όπως για παράδειγμα, τεχνικές από το χώρο της Τεχνητής Νοημοσύνης, τεχνικές από το χώρο της υπολογιστικής Πλαισίου, ή ακόμη από το χώρο της υπολογιστικής Όψεων. Ομοίως όταν κανείς εξετάζει το κύκλο ζωής διαδικασιών, εάν και η προσαρμογή μιας διαδικασίας είθισται να λαμβάνει χώρα κατά το χρόνο εκτέλεσης, είναι απαραίτητο να λαμβάνεται υπόψη το ‘πότε’ πραγματοποίούνται οι περισσότεροι υπολογισμοι, π.χ. κατά το χρόνο εκτέλεσης, το χρόνο σχεδιασμού ή το χρό...
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This booklet is abstracted and abridged from “The Digital Technology and Methodology Cookbook”, D3.4 DL.org Project Deliverable, April 2011
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Digital Library (DL) interoperability, as it is being reported in the DL.org Digital Library Reference Model, is intimately related to function interoperability. A prerequisite for the later is an appropriate function description,... more
Digital Library (DL) interoperability, as it is being reported in the DL.org Digital Library Reference Model, is intimately related to function interoperability. A prerequisite for the later is an appropriate function description, publication and discovery mechanisms. The importance of a framework which accommodates the specification of key DL function characteristics such as interface, behavior, dependencies and semantics, has been highlighted by the DL.org Functionality working group. Such a framework should be used in appropriate registries, which cater for the publication and discovery of DL functionality. In this paper we report the findings of the DL.org Functionality working group in terms of a DL function description framework and a set of contemporary registries that can serve as the basis for the provision of a DL Function interoperability enabling registry.
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Abstract. Peer-to-peer (p2p) applications exhibit characteristics such as dynamic network topology and configuration, heterogeneity and scalability that make their development a complicated task. This is further aggravated due to the... more
Abstract. Peer-to-peer (p2p) applications exhibit characteristics such as dynamic network topology and configuration, heterogeneity and scalability that make their development a complicated task. This is further aggravated due to the required satisfaction of ...
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... D7: New Business Opportunities stemming from the application of the P2P approach (Final Version) Authors: T. Pilioura, G. Athanasopoulos, A. Tsalgatidou, Periklis Liaskovitis, Eleni Kolokouri (University of Athens) Submission Date:... more
... D7: New Business Opportunities stemming from the application of the P2P approach (Final Version) Authors: T. Pilioura, G. Athanasopoulos, A. Tsalgatidou, Periklis Liaskovitis, Eleni Kolokouri (University of Athens) Submission Date: 30/04/03 ...
... Therefore, by addressing the challenges of information collection and distributed execution of service chains, we are also facilitating the performance and precision ... the Tuplespace paradigm[8] [9] for building the SCS Engine and... more
... Therefore, by addressing the challenges of information collection and distributed execution of service chains, we are also facilitating the performance and precision ... the Tuplespace paradigm[8] [9] for building the SCS Engine and the use of a Peer-to-Peer (P2P) architecture ...
... 0.5 JXTA model, GeSMo George Athanasopoulos(NKUA) 0,6 Grid Services state of the art Vangelis Floros(NKUA) ... 1.2 P2P Service Extensions to GeSMO George Athanasopoulos (NKUA) 1.3 Web Service Extensions to GeSMO R. Grønmo (SINTEF)... more
... 0.5 JXTA model, GeSMo George Athanasopoulos(NKUA) 0,6 Grid Services state of the art Vangelis Floros(NKUA) ... 1.2 P2P Service Extensions to GeSMO George Athanasopoulos (NKUA) 1.3 Web Service Extensions to GeSMO R. Grønmo (SINTEF) Page 3. ...
Abstract: Within the currently forming pervasive computing environment, services and information sources thrive. Instantiations of the service oriented computing paradigm, eg Web, Peer-to-Peer (P2P) and Grid services, are continuously... more
Abstract: Within the currently forming pervasive computing environment, services and information sources thrive. Instantiations of the service oriented computing paradigm, eg Web, Peer-to-Peer (P2P) and Grid services, are continuously emerging, whilst information can be collected ...
Michael Adams Salman Akram Pinar Alper Toshiyuki Amagasa Samuil Angelov I. Budak Arpinar George Athanasopoulos Aysu Betin-Can Rafae Bhatti Panagiotis Bouros Marco Brambilla Bogdan Cautis Hao Chen Mingqiang Chen Sara Comai Yanlei Diao... more
Michael Adams Salman Akram Pinar Alper Toshiyuki Amagasa Samuil Angelov I. Budak Arpinar George Athanasopoulos Aysu Betin-Can Rafae Bhatti Panagiotis Bouros Marco Brambilla Bogdan Cautis Hao Chen Mingqiang Chen Sara Comai Yanlei Diao Cristina Feier Cagdas Gerede Antoon Goderis Roy Grønmo Oscar H. Ibarra Ashish Kamra Uwe Keller Naotake Kitagawa Woralak Kongdenfha George Kontolemakis Jacek Kopecky Jens Lechtenboerger Carolin Letz Phillip Lord Xumin Liu Zaki Malik ... Andrea Maurino Louise Moser Hamid Reza Motahari Nezhad Justin ...
Executive Summary The purpose of this deliverable (D10) is to provide a detailed specification of the SODIUM Runtime environment. The Runtime environment forms part of the overall SODIUM platform and is composed of the following... more
Executive Summary The purpose of this deliverable (D10) is to provide a detailed specification of the SODIUM Runtime environment. The Runtime environment forms part of the overall SODIUM platform and is composed of the following components:• the SODIUM Composition Repository,• the USQL Query Engine and• the USCL Execution Engine.
Service-oriented computing (SOC) is an emerging software engineering trend that promises to reform the way applications are built. Services, the main building blocks in this new engineering trend, provide the means to utilize... more
Service-oriented computing (SOC) is an emerging software engineering trend that promises to reform the way applications are built. Services, the main building blocks in this new engineering trend, provide the means to utilize functionality that is o¤ ered by service providers via message exchanges over the Internet. The unique characteristics of a service have been a highly debated research issue (see, for example, Kozlenkov et al. 2006; Czajkowski et al. 2004; Vogels 2003, 59); nonetheless, all researchers agree that a ...
1 SINTEF, Forskningsveien 1, Blindern, 0314 OSLO, Norway arne.j.berre@sintef.no 2 Birkbeck College,University of London, UK dimarzo@dcs.bbk.ac.uk 3 Centre de Recherche Henri Tudor, Luxembourg djamel.khadraoui@tudor.lu 4 University ...
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Serving geographic information via standardized Web services has been widely accepted as a useful approach. Web-enabled environmental models simulating real-world phenomena are, however, rare. The models predict observations traditionally... more
Serving geographic information via standardized Web services has been widely accepted as a useful approach. Web-enabled environmental models simulating real-world phenomena are, however, rare. The models predict observations traditionally served by geospatial Web services compliant to well-defined standards. Using standardized Web services could support decoupling of models, comparison of similar models, and the automatic integration into existing geospatial workflows. Modeling experts face several ...
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Abstract: Industrial application development approaches are striving for solutions that promote the rapid development of flexible and adaptable systems and the exploitation of legacy systems and resources. The Service-oriented Development... more
Abstract: Industrial application development approaches are striving for solutions that promote the rapid development of flexible and adaptable systems and the exploitation of legacy systems and resources. The Service-oriented Development (SOD) paradigm, a current trend in ...
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We report the case of a patient who was admitted to the hospital with acute pulmonary embolism 2 weeks after a complicated pelvis fracture. Echocardiography revealed a large, long, and mobile thrombus in the right atrium. The patient was... more
We report the case of a patient who was admitted to the hospital with acute pulmonary embolism 2 weeks after a complicated pelvis fracture. Echocardiography revealed a large, long, and mobile thrombus in the right atrium. The patient was scheduled to undergo urgent surgical thrombectomy. Preoperative echocardiography did not detect any thrombi in the right heart and pulmonary artery. The obvious embolism of this large thrombus in the pulmonary circulation was silent as the patient remained asymptomatic and hemodynamically stable. We discuss the contribution of echocardiography to the appropriate therapeutic management of right atrial thrombi and particularly to the cancellation of urgent operative thrombectomy.
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The SAMBA (Systems for AMBient intelligence enabled by Agents) architecture reported here is a conceptual service-oriented architecture supporting the interaction and interoperability of systems, applications and actors by the notion of... more
The SAMBA (Systems for AMBient intelligence enabled by Agents) architecture reported here is a conceptual service-oriented architecture supporting the interaction and interoperability of systems, applications and actors by the notion of an “Ambient Intelligence Element Society”. The objective is to provide an ecosystem infrastructure supporting the interaction and interoperability of various elements by encapsulating and representing them through agents acting as members of an Ambient Intelligence Elements Society, and by using executable models at run-time in support of interoperability.