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PUBLICATIONS

2010

Many XML filtering systems have emerged in recent years identifying XML data that structurally match XPath queries in an efficient way. However, apart from structural matching, it is considered…
While Digital Libraries (DLs) are moving towards universally accessible collections of human knowledge, considerable advances are needed in DL methodologies and technologies to make this happen.…
News Archives constitute an important source for historians, both for research and educational purposes. However, access to their material is not easy due to the special characteristics of the…
People’s preferences are expressed at varying levels of granularity and detail as a result of partial or imperfect knowledge. One may have some preference for a general class of entities, for…
Many applications offer a form-based environment for naive users for accessing databases without being familiar with the database schema or a structured query language. User interactions are…
On-line analytical processing (OLAP) typically involves complex aggregate queries over large datasets. The data cube has been proposed as a structure that materializes the results of such queries…
Virtualization of computer systems has made feasible the provision of entire distributed infrastructures in the form of services. Such services do not expose the internal operational and physical…
Digital Library interoperability, as reported in the DL.org Digital Library Reference Model, is intimately bound up with function interoperability. A prerequisite for the latter is an appropriate…

2009

Software development kits (SDKs) and supporting tools for Graphics Processor Units (GPUs) have matured and they now enable the implementation of complex middleware that takes advantage of the…
Complex on-demand data retrieval and processing is a characteristic of several applications and combines the notions of querying & search, information filtering & retrieval, data…
Existing GRID infrastructures rely on explicit user instructions in order to replicate files for the purposes of resiliency. This human-intensive process is inefficient, error prone and, more…
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Natural language user interfaces to database systems have been studied for several decades now. They have mainly focused on parsing and interpreting natural language queries to generate them in a…
Anticipatory scheduling (AS) of I/O requests has become a viable choice for block-device schedulers in open-source OS-kernels as prior work has established its superiority over traditional disk-…
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2008

The 3rd Workshop on Foundations of Digital Libraries was held in Århus, Denmark, on September 18, 2008, in conjunctions with the 12th European Conference on Research and Advanced Technologies on…
The BioMagResBank (BMRB: www.bmrb.wisc.edu) is a repository for experimental and derived data gathered from nuclear magnetic resonance (NMR) spectroscopic studies of biological molecules. BMRB is a…
DelosDLMS is a novel digital library management system (DLMS) that has been developed as an integration effort within the DELOS Network of Excellence, a European Commission initiative funded…
Database research is expanding, with major efforts in system architecture, new languages, cloud services, mobile and virtual worlds, and interplay between structure and text.
The lifecycle of a data cube involves efficient construction and storage, fast query answering, and incremental updating. Existing ROLAP methods that implement data cubes are weak with respect to…
There has been much work in the past that combines the fields of Databases and Natural Language Processing. Almost all efforts, however, have gone in one direction: given unstructured, natural-…
We present a novel approach for filtering XML documents using nondeterministic finite automata and distributed hash tables. Our approach differs architecturally from recent proposals that deal with…
Ontologies offer a flexible and expressive layer of abstraction, very useful for capturing the semantics of information repositories and facilitating their retrieval either by the user or by the…
In the classical database world, information access has been based on a paradigm that involves structured, schema-aware, queries and tabular answers. In the current environment, however, where…
There has been much work in the past that combines the fields of Databases and Natural Language Processing. Almost all efforts, however, have gone in one direction: given unstructured, natural-…
Précis queries represent a novel way of accessing data, which combines ideas and techniques from the fields of databases and information retrieval. They are free-form, keyword-based, queries on top…
At the end of last century (Internet time elapses much quicker than normal time, and it already looks like a long time ago), the “information explosion” on the Web on one side, and the flourishing…

2007

Implementation of the data cube is an important and scientifically interesting issue in On-Line Analytical Processing (OLAP) and has been the subject of a plethora of related publications. Naive…
Most methods proposed so far for classification of high-dimensional data are memory-based and obtain a model of the data classes through training before actually performing any classification. As a…
In large-scale distributed retrieval, challenges of latency, heterogeneity, and dynamicity emphasise the importance of infrastructural support in reducing the development costs of state-of-the-art…
This book constitutes the refereed proceedings of the 11th East European Conference on Advances in Databases and Information Systems, ADBIS 2007, held in Varna, Bulgaria, in September/October 2007…
In large federations of autonomous database systems, automatic distribution of the query workload to those systems is a critical issue. We examine this problem under the perspective of…
The term "Digital Libraries" corresponds to a very complex notion with several diverse aspects and cannot be captured by a simple definition. A robust model of Digital Libraries encapsulating the…
As a large fraction of available information resides in databases, the need for facilitating access for the large majority of users becomes increasingly more important. Precis queries are free-form…
Open Agoras of information are distributed environments of independent systems, where seeking for information is similar to real-life searching for material goods. Interaction with these systems…

2006

Data cube construction has been the focus of much research due to its importance in improving efficiency of OLAP. A significant fraction of this work has been on ROLAP techniques, which are based…