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Distributed Management of Data Laboratory (D.M.O.D.)
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Last revision date:
Wednesday February 05, 2014



Current Projects

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Completed Projects

»Self-Peer: Self-organized peer to peer systems based on their content and the query workload: Construction, Updates, Routing and Query Processing, PENED 03-ED-591 is co-financed by E.U.-European Social Fund (75%) and the Greek Ministry of Development-GSRT (25%), Nov 2005 - Nov 2008(66000 ?)
Self-Peer focuses on improving performance and quality of services that peer to peer systems offer. To this end, our goal is to organize peers according to their content and the query workload of the system. In particular, we aim at self-organizing peers according to the set of queries that they can answer. [More]
The overall goal of this project is to strengthen the competitiveness and innovation of regional SMEs through incorporating in their operation the new opportunities offered by social networking. In particular, the project aims at improve web presence of SMEs in the region and using information from social networking for targeting advertisement and adaptive service provision. [More]
The recent explosive growth of the Internet gives rise to the possibility of a global computer of grand-scale consisting of Internet-connected computing entities (possibly mobile, with varying computational capabilities, connected among them with different communication media), globally available and able to provide to its users a rich menu of high-level integrated services that make use of its aggregated computational power, storage space, and information resources. Achieving this efficiently and transparently is a major challenge that can be overcome by introducing an intermediate layer, the overlay computer. The goal of this project is to investigate the principles and develop the algorithmic methods for building such an overlay computer that enables this efficient and transparent access to the resources of an Internet based global computer. [More]
»DIP3: The 3Ps of Distributed Information Delivery: Preferences, Privacy and Performance, EC Funding, Marie Curie, Aug 2009 - July 2011 (194 kEuro)
Today there is an abundance of data on line. The grand challenge is turning this huge amount of data to knowledge useful to the individual users of the Internet. DiP3 will address this challenge by tackling one form of data processing, often referred to as ?push? data delivery. In push data delivery, instead of explicitly searching for information, users get notified when relevant information becomes available. Examples of such systems include RSS feeds, news alerts and aggregators. The scientific objective of the proposal is to derive models, algorithms and techniques to control both the amount and quality of information received by users. To this end, we propose incorporating user preferences in data delivery to rank data items based on their relevance to the users. Although preference specification has been extensively studied, there is little previous research work on incorporating preferences in Internet-scale data delivery. Furthermore, DIP3 will exploit the inherent social connections between users in Web 2.0 as expressed through social networks, social tagging, and other community-based features to enhance preference specification and ranked information delivery. The project will focus on two issues central to the success of such systems: privacy preservation and performance. [More]
»DBGlobe: A Data Centric Approach to Global Computing, IST-2001-32645, EU Funding, Jan 2002 - Apr 2005 (347 kEU)
The DBGlobe project aims at developing novel data management techniques to deal with the challenge of global computing. On the premise, global computing is a database problem: how to design, build and analyse systems that manage large amount of data. However, the traditional database approach of storing data of interest in monolithic database management systems becomes obsolete in such environments. In current database research, data are relatively homogeneous, exhibit a small degree of distribution (just a few network sites) are passive in that they remain unchanged unless explicitly updated. All these assumptions do not hold in the global computing world. This creates the need for new theoretical foundations in all aspects of data management: modelling, storage and querying. [More]
»Construction of Byzantine Pierced Jewellery using Advanced CAD/CAM Techniques: PABET-2000-00BE3, GSRT Funding, Sep 2001 - Feb 2003 (8.000.000 GRD)
The aim of this project is to develop novel CAD techniques for the design and manufacturing of traditional pierced jewellery.
A great amount of information becomes available to users every day. However, locating valuable information can prove out to be an overwhelming task, due to the great volume of accessible data. Therefore, in addition to traditional web search methods, proactive models are becoming increasingly popular and used by a continuously growing portion of Internet users. In these models, users specify their interests via subscriptions and the system automatically forwards all new information (or events) that matches their subscriptions to them. The main feature of such systems is the generation of information from every individual user and the need for its immediate forwarding towards all other interested users. For this reason, we face the challenge of handling very large, continuous flows of information, a fact that demands the ranking of the forwarded information, so that users receive only what is most useful to them. The project will focus on the development, implementation and evaluation of models, algorithms and techniques for supporting the ranking of information being forwarded towards the users of large-scale network-centric information management systems, such as publish/subscribe systems. [More]
»DIOPTRA: A Location Management Mechanism for Mobile Agents, Research Committee, University of Ioannina, Jan 2002 -Jan 2003 (5800 ?)
The Dioptra project aims at desinging and implementing a flexible and effective mechanism which will have the ability to manage the location of mobile agents, programs which act on the behalf of an application and travel to the internet searching for useful information. Our main purpose is this mechanism to respond to the demands posed by an environment which deals with users who are accessing the Internet from static or mobile units with limited sources (palmtops, handhelp,wap-phones). [More]
»ForeverSOA: , Financed by INRIA in the context of the Associated Group Program, Jan 2009 - Dec 2011 (30 kEuro)
This line of research aims at a principled approach for the dynamic maintenance of service-oriented software (i.e., software that is built by composing available services) on the basis of fundamental design principles and middleware that supports their adoption. The need for maintaining service-oriented software may be triggered by changes in the quality requirements of the end-users of service-oriented software (e.g., performance, availability, reliability), or by the the independent evolution of constituent services (e.g., services may be deployed or undeployed at anytime). [More]
»EXAPSIS - ΕΞΑΠΣΥΣ: Smart Autonomous Storage Devices, PENED 99-445, GSRT Funding, Oct 1999 - June 2001 (20.000.000 GRD)
»Reverse CAD: Reverse Engineering using Feature-based and Geometric Constraint-based CAD model, PENED 2001-01ED329, GSRT Funding, Apr 2003-Apr 2007 (88041.09 ?)
The aim of this project is to improve current methods for producing reverse engineering solid models using geometric constraints that are applied to the model either automatically, based on the type of application, or through an interactive procedure. [More]
»Algorithm for Computer Graphics and Visualization: Internet Access to a Distributed Resource: Nov 1999 - Nov 2001, Joint Greek-Czech Research and Technology Program (2.730.000 GRD)
»HeldiNet Human Network on New Database Technologies: Jan 2000- July 2001, GSRT Funding (1.600.000 GRD)
»Usability Net Human Network on Software Usability: Jan 2000- July 2001, GSRT Funding (545.000 GRD)
Funded by Nokia, Hewlett Packard, Yomimedia and TEKES, 1999 - 2001 [More]
»DECA: Data Engineering for Context - Aware Persasive Computing, General Secretariat of Research and Technology (GSRT) grant for "Cooperation in S&T areas with non-European countries", Oct 03- Dec 06 (60000 ?)
DECA will focus on data discovery and consistency maintenance. DECA will identify what aspects of context are relevant to these data engineering tasks and investigate its use in enhancing these tasks. In a nutshell, the objectives of the project are two-fold: First, DECA will exploit data engineering techniques in modeling, storing and querying context information in pervasive environments. Our overall goal in this direction is the design of a context-management system (as pposed to a database management system). Second, DECA will look into the integration of context information with data discovery and replication. These data engineering tasks are central to pervasive computing but complex. The use of context will lead to more meaningful and more efficient replication and data discovery. [More]
»DanDy: Data Quality in Dynamic Networks, General Secretariat of Research and Technology (GSRT) grant for "Cooperation with S & T Institutions in non-European Countries - 2005", Nov 05- May 08 (60000 ?)
Large-scale distributed systems with dynamic membership such as sensor networks and peer-to-peer systems have received much current attention. In such networks, knowing all the participating nodes is prohibited due to their scale and dynamicity. Instead, each participating node knows about (i.e. connects with) a small number of other nodes, thus creating an overlay network on top of the physical one. While much current research focuses on achieving Quality of Service (QoS) metrics such as response time and throughput, Quality of Dat (QoD) guarantees, although central, have received less attention. Instances of QoD include data freshness in case of updates as well as accuracy and completeness in case of data retrieval. The goal of the DanDy (Data Quality in Dynamic Networks) project is to define unified metrics for characterizing the Quality of Data and derive ways for creating overlays and procedures that improve these quality guarantees. The project will investigate the application of the research results in a car-to-car network which is an instance of a dynamic network. The company involved specializes in such software. In particular, QoD will be investigated for the propagation of safety-related information (such as information about the current road condition) among vehicles. [More]
»SemaNet: Semantic Overlay Networks of Services in Ubiquitous Computing, General Secretariat of Research and Technology (GSRT) grant for "Cooperation in S&T areas with European countries", Greece-Cyprus co-operation, (11740 ?).
Web services provide a standard means of interoperating between different software applications, running on a variety of platforms and frameworks. The focus of the SemaNet project is on the efficient querying of web services in a global computing environment. Our approach is based on creating overlay networks of similar web services. Similarity between web services is based on a set of concepts characterizing each web service. Such concepts are either provided explicitly with the description of each service or extracted implicitly from the past history of web service accesses. [More]
»MobWS: Context Aware Web Services for Nomadic E-Business, General Secretariat of Research and Technology (GSRT) grant for "Cooperation in S&T areas with European countries" (12230 ?)
The aim of this project is the design and development of mechanisms that enable the quality (e.g. reliability, availability, timeliness) analysis and estimation of complex E-Business processes that take place in pervasive computing environments. These mechanisms must be context-aware in the sense that they must be able to monitor several qualitative characteristics of the services used in the complex E-Business processes towards their qualitative analysis.
»CONSERV: Overlay Networks of Context-Aware Web Services: Management, Adaptability and Query Processing, PYTHAGORAS action of EPEAEK II (60000 ?)
CONSERV is a middleware infrastructure for the development of virtual databases that enable the management of contextual information, spread in pervasive computing environments. The contextual information we deal with is provided by ad-hoc communities of Web services offered by peers that arbitrarily join and leave the pervasive computing environment. CONSERV provides an SQL front-end for the answering of queries. The cornerstone of the proposed infrastructure is the fact that we replace the traditional treatment of databases as persistent collections of tuples by the assumption that a database relation is a collection of tuples dynamically compiled from an ad-hoc set of peers.
Final presentation (in Greek)
»GeoRouting: Placing and Routing in VLSI using Geometric Constraints., PYTHAGORAS action of EPEAEK II (50000 ?)
GeoRouting explores the usage of geometric constraints in VLSI placement and routing in cell arrays. A method is developed that combines advanced techniques for analyzing and solving systems of implicitly imposed geometric constraints and interactive dialogs with expert users for placing and routing in cell arrays.


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