http://hdl.handle.net/2117/3297 2013-05-20T01:11:58Z http://hdl.handle.net/2117/19183 Title: Model and requirements for a multiresolution time series database management system Authors: Llusa Serra, Aleix; Escobet Canal, Teresa; Vila Marta, Sebastià Abstract: In this paper we define a model for multiresolution time series database management systems. The main objective is to store compactly a time series and manage consistently its temporal dimension. It is achieved by extracting diferent resolutions and attributes summaries from the time series. Our work is concerned in putting together two areas of study: time series analysis and database management systems (DBMS). Time series analysis offers a great deal of methodologies and algorithms to process time series data and database field provides software expertise in managing data. Therefore it is of primary relevance that DBMS support time series. 2013-05-13T15:19:06Z http://hdl.handle.net/2117/9360 Title: Time-varying volume visualization Authors: Ayala Vallespí, M. Dolors; Campos Miralles, Jordi; Ferré, Maria; Grau Carrion, Sergi; Puig Puig, Anna; Tost Pardell, Daniela Abstract: Volume rendering is a very active research field in Computer Graphics because of its wide range of applications in various sciences, from medicine to flow mechanics. In this report, we survey a state-of-the-art on time-varying volume rendering. We state several basic concepts and then we establish several criteria to classify the studied works: IVR versus DVR, 4D versus 3D+time, compression techniques, involved architectures, use of parallelism and image-space versus object-space coherence. We also address other related problems as transfer functions and 2D cross-sections computation of time-varying volume data. All the papers reviewed are classified into several tables based on the mentioned classification and, finally, several conclusions are presented. 2010-10-05T14:50:08Z http://hdl.handle.net/2117/8378 Title: Hardware and software improvements of volume splatting Authors: Vergés Garcia, Eduard; Grau Carrion, Sergi; Tost Pardell, Daniela Abstract: This paper proposes different hardware-based acceleration of the three classical splatting strategies: emph{composite-every-sample}, emph{object-space sheet-buffer} and emph{image-space sheet-buffer}. 2010-07-23T12:48:46Z