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Displaying 1-24 out of 24 total
Actions with Duration and Constraints: the Ramification Problem in Temporal Databases
Found in: Tools with Artificial Intelligence, IEEE International Conference on
By Nikos Papadakis, Dimitris Plexousakis
Issue Date:November 2002
pp. 83
The ramification problem is a hard and ever present problem in systems exhibiting a dynamic behavior. The area of temporal databases in particular is still lacking satisfactory solutions to the ramification problem. In this paper, we address the ramificati...
 
Deriving Specifications for Composite Web Services
Found in: 2012 IEEE 36th Annual Computer Software and Applications Conference - COMPSAC 2012
By George Baryannis,Manuel Carro,Dimitris Plexousakis
Issue Date:July 2012
pp. 432-437
We address the problem of synthesizing specifications for composite Web services, starting from those of their component services. Unlike related work in programming languages, we assume the definition of the component services (i.e. their code) to be unav...
 
Towards Optimal and Scalable Non-functional Service Matchmaking Techniques
Found in: 2012 IEEE 19th International Conference on Web Services (ICWS)
By Kyriakos Kritikos,Dimitris Plexousakis
Issue Date:June 2012
pp. 327-335
Service-orientation paves the way for the Internet of Services (IoS), where millions of services will be available for building novel applications. As such, the service non-functional aspect should be considered for filtering and selecting among the great ...
 
Requirements for QoS-Based Web Service Description and Discovery
Found in: IEEE Transactions on Services Computing
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:October 2009
pp. 320-337
The goal of Service Oriented Architectures (SOAs) is to enable the creation of business applications through the automatic discovery and composition of independently developed and deployed (Web) services. Automatic discovery of Web Services (WSs) can be ac...
 
Exploiting Semantics for Indoor Navigation and User-Tracking
Found in: Ubiquitous, Autonomic and Trusted Computing, Symposia and Workshops on
By Emmanouil Nikoloudakis, Manolis Kritsotakis, Antonis Bikakis, Theodore Patkos, Grigoris Antoniou, Dimitris Plexousakis
Issue Date:July 2009
pp. 149-154
The ubiquitous intelligence vision requires the development of systems that integrate sensing, computing and networking with advanced techniques for data and knowledge representation and management. Taking advantage of these opportunities, this paper prese...
 
The frame problem in Web service specifications
Found in: Principles of Engineering Service Oriented Systems, ICSE Workshop on
By George Baryannis, Dimitris Plexousakis
Issue Date:May 2009
pp. 9-12
This work explores the frame problem and its effects in devising Web service specifications. The frame problem encompasses the issues raised when trying to concisely state in a specification that nothing changes except when explicitly mentioned otherwise. ...
 
Mixed-Integer Programming for QoS-Based Web Service Matchmaking
Found in: IEEE Transactions on Services Computing
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:April 2009
pp. 122-139
QoS-based Web Service (WS) discovery has been recognized as the main solution for filtering and selecting between functionally equivalent WSs stored in registries or other types of repositories. There are two main techniques for QoS-based WS matchmaking (f...
 
A Semantics-Based User Model for the Support of Personalized, Context-Aware Navigational Services
Found in: Ontologies in Interactive Systems, International Workshop on
By Maria Michou, Antonis Bikakis, Theodore Patkos, Grigoris Antoniou, Dimitris Plexousakis
Issue Date:September 2008
pp. 41-50
The Ambient Intelligence paradigm has evolved significantly during the last few years and aims at developing context-aware and adaptive systems that enable people to use personalized services. Context-awareness, semantics enriched services and adaptivity a...
 
Evaluation of QoS-Based Web Service Matchmaking Algorithms
Found in: Services, IEEE Congress on
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:July 2008
pp. 567-574
Web Service (WS) discovery is a prerequisite for achieving WS composition and orchestration. Although a lot of research has been conducted on the functional discovery of WSs, the proposed techniques fall short when faced with the foreseen increase in the n...
 
A Semantic QoS-based Web Service Discovery Algorithm for Over-Constrained Demands
Found in: Next Generation Web Services Practices, International Conference on
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:October 2007
pp. 49-54
Discovery of Web Services (WSs) has gained great research attention due to proliferation of available WSs and the failure of the syntactic approach of UDDI. Semantic discovery mechanisms have been invented in order to provide more precise results. However,...
 
Semantic QoS-based Web Service Discovery Algorithms
Found in: Web Services, European Conference on
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:November 2007
pp. 181-190
The success of the Web Service (WS) paradigm has led to a proliferation of available WSs, which are advertised in WS registries. While sophisticated semantic WS discovery algorithms are operating on these registries to return matchmaking results with high ...
 
The Ramification Problem in Temporal Databases: Concurrent Execution with Conflicting Constraints
Found in: Tools with Artificial Intelligence, IEEE International Conference on
By Nikos Papadakis, Grigoris Antoniou, Dimitris Plexousakis
Issue Date:October 2007
pp. 274-278
In this paper we study the ramification problem in the setting of temporal databases. Standard solutions from the literature on reasoning about action are in- adequate because they rely on the assumptions that fluents persist and actions have effects on th...
 
Requirements for QoS-based Web Service Description and Discovery
Found in: Computer Software and Applications Conference, Annual International
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:July 2007
pp. 467-472
The goal of Service Oriented Architectures is to enable the creation of business applications through the automatic discovery and composition of independently developed and deployed (Web) services. Automatic discovery of Web Services (WSs) can be achieved ...
 
Semantic QoS Metric Matching
Found in: Web Services, European Conference on
By Kyriakos Kritikos, Dimitris Plexousakis
Issue Date:December 2006
pp. 265-274
As the Web Service paradigm gains popularity for its promise to transform the way business is conducted, the number of deployed Web Services grows with a fast rate. While sophisticated semantic discovery mechanisms have been invented to overcome the UDDI's...
 
Enhanced Specifications for Web Service Composition
Found in: Web Services, European Conference on
By Vassiliki Alevizou, Dimitris Plexousakis
Issue Date:December 2006
pp. 223-232
The service-oriented computing research community has devoted a great deal of attention to Web service specification, discovery and composition. The ability to efficiently select and compose services in order to accomplish a complex user goal is of utmost ...
 
Addressing the Ramification Problem in a Temporal Context: The Case of Concurrent Actions
Found in: Tools with Artificial Intelligence, IEEE International Conference on
By Nikos Papadakis, Dimitris Plexousakis
Issue Date:November 2003
pp. 545
The ramification problem is a hard and ever present problem in systems exhibiting a dynamic behavior. The area of temporal databases in particular is still lacking satisfactory solutions to the ramification problem. In this paper, we address the problem fo...
 
Novel Optimal and Scalable Non-Functional Service Matchmaking Techniques
Found in: IEEE Transactions on Services Computing
By Kyriakos Kritikos,Dimitris Plexousakis
Issue Date:February 2013
pp. 1
Service-orientation paves the way for the Internet of Services (IoS), where millions of services will be available to realize the everyday user applications or tasks. Consequently, as a great number of functionally-equivalent services will be available for...
 
Exelixis: evolving ontology-based data integration system
Found in: Proceedings of the 2011 international conference on Management of data (SIGMOD '11)
By Dimitris Plexousakis, Haridimos Kondylakis
Issue Date:June 2011
pp. 1283-1286
The evolution of ontologies is an undisputed necessity in ontology-based data integration. Yet, few research efforts have focused on addressing the need to reflect ontology evolution onto the underlying data integration systems. We present Exelixis, a web ...
     
Evaluation of top-k queries in peer-to-peer networks using threshold algorithms
Found in: Proceedings of the 19th ACM international conference on Information and knowledge management (CIKM '10)
By Constantinos Chalkidis, Dimitris Plexousakis, Ioannis Chrysakis
Issue Date:October 2010
pp. 1305-1308
In p2p networks, top-k query processing can provide a lot of advantages both in time and bandwidth consumption. Several algorithms have been proposed for the evaluation of top-k queries. A large percentage of them follow the Threshold Approach. We focus on...
     
Enabling ontology evolution in data integration
Found in: Proceedings of the 2010 EDBT/ICDT Workshops (EDBT '10)
By Dimitris Plexousakis, Haridimos Kondylakis
Issue Date:March 2010
pp. 1-7
Due to the rapid scientific development, ontologies and schemata need to change. When ontologies evolve, the changes should somehow be rendered and used by the pre-existing data integration systems, a problem that most of the integration systems available ...
     
On labeling schemes for the semantic web
Found in: Proceedings of the twelfth international conference on World Wide Web (WWW '03)
By Dimitris Plexousakis, Michel Scholl, Sotirios Tourtounis, Vassilis Christophides
Issue Date:May 2003
pp. 544-555
This paper focuses on the optimization of the navigation through voluminous subsumption hierarchies of topics employed by Portal Catalogs like Netscape Open Directory (ODP). We advocate for the use of labeling schemes for modeling these hierarchies in orde...
     
RQL: a declarative query language for RDF
Found in: Proceedings of the eleventh international conference on World Wide Web (WWW '02)
By Dimitris Plexousakis, Gregory Karvounarakis, Michel Scholl, Sofia Alexaki, Vassilis Christophides
Issue Date:May 2002
pp. 592-603
Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of large volumes of metadata, i.e., information describing the available Web content and services. Better knowledge about their meaning, usage, acces...
     
Conference review: Semantic Web Workshop:: models, architectures and management
Found in: intelligence
By Dimitris Plexousakis, Panos Constantpoulos, Vassilis Christophides
Issue Date:March 1999
pp. 39-44
This article is a survey of research areas in which motion plays a pivotal role. The aim of the article is to review current approaches to modeling motion together with related data structures and algorithms, and to summarize the challenges that lie ahead ...
     
Simulation and analysis of business processes using GOLOG
Found in: Proceedings of conference on Organizational computing systems (COCS '95)
By Dimitris Plexousakis
Issue Date:August 1995
pp. 311-322
This paper describes a novel approach to simulating and analyzing business processes using GOLOG, a high-level logic programming language suitable for defining complex behaviors and capable of simulating action execution. The language is based on an extend...
     
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