331 research outputs found
Professor Timos Sellis, 2018
No full textDirector of Swinburne’s Data Science Research Institute, Professor Timos Sellis, has been honoured with a prestigious international award for his more than 30-year contribution to database systems research and for broadening the reach of data engineering research.
Professor Sellis was selected by a committee among international candidates to be awarded the Institute of Electrical and Electronics Engineers (IEEE) Technical Committee of Data Engineering Impact Award, which will be presented in Paris in April.
The IEEE TCDE Impact Award recognises database researchers from the around the world who have contributed to expanding the data engineering field.
Photograph originally appeared in the Swinburne News item titled 'Swinburne’s Professor Timos Sellis wins prestigious Impact award' on Friday 23 March 2018
Spatio-temporal Composition in Multimedia Applications
No full textThe motivation for this research work is the lack of a complete declarative way for representative spatio-temporal composition of objects in the current multimedia document standards and authoring tools. In this paper we define such a model which is based on a set of spatial and temporal relationships between actors in multimedia applications. Our work exploits existing approaches for spatial and temporal relationships. We extend these relationships in order to cover the specific requirements of multimedia applications and we integrate the results in a uniform framework for spatio-temporal composition representation. 1 SPATIO - TEMPORAL COMPOSITION IN MULTIMEDIA APPLICATIONS Michael Vazirgiannis, Yannis Theodoridis, Timos Sellis Department of Electrical Engineering, Division of Computer Science, National Technical University of Athens Zographou 157 73 Athens, Greece. e-mail: {mvazirg, theodor, timos}@cs.ntua.gr Abstract The motivation for this research work is the lack of a compl..
Modelling Reactive Multimedia: Design and Authoring
No full textMultimedia document authoring is a multifaceted activity, and authoring tools tend to concentrate on a restricted set of the activities involved in the creation of a multimedia artifact. In particular, a distinction may be drawn between the design and the implementation of a multimedia artifact.
This paper presents a comparison of three different authoring paradigms, based on the common case study of a simple interactive animation. We present details of its implementation using the three different authoring tools, MCF, Fran and SMIL 2.0, and we discuss the conclusions that may be drawn from our comparison of the three approaches
On the Move to Meaningful Internet Systems: OTM 2014 Conferences - Confederated International Conferences: CoopIS, and ODBASE 2014, Amantea, Italy, October 27-31, 2014, Proceedings
No full textSellis: SISYPHUS: The Implementation of a Chunk-Based Storage Manager for OLAP Data Cubes
No full textAbstract. In this article, we present the design and implementation of SISYPHUS, a storage manager for data cubes that provides an efficient physical base for performing OLAP operations. On-Line Analytical Processing (OLAP) poses new requirements to the physical storage layer of a database management system. Special characteristics of OLAP cubes such as multidimensionality, hierarchical structure of dimensions, data sparseness, etc., are difficult to handle with ordinary record-oriented storage managers. The SISYPHUS storage manager is based on a chunk-based data model that enables the hierarchical clustering of data with a very low storage cost. In this article we present the implementation of SISYPHUS ’ chunk-oriented file system as well as present the core architecture of the system and reason on various design choices and implementation solutions. Key words: hierarchical chunking, storage manager, OLAP, data cube, data clustering
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