Now showing items 1-20 of 20

    • Accelerating software memory compression on the Cell/B.E. 

      Beltran Querol, Vicenç; Martorell Bofill, Xavier; Torres Viñals, Jordi; Ayguadé Parra, Eduard (2008)
      Conference report
      Restricted access - publisher's policy
      The idea of transparently compressing and decompressing the content of main memory to virtually enlarge their capacity has been previously proposed and studied in the literature. The rationale behind this idea lies in the ...
    • Coding of biosignals using the discrete wavelet decomposition 

      Reig Bolano, Ramon; Marti Puig, Pere; Solé-Casals, Jordi; Zaiats, Vladimir; Parisi Baradad, Vicenç (Springer, 2009)
      Conference report
      Restricted access - publisher's policy
      Wavelet derived codification techniques are widespread used in image codifiers. The wavelet based compression methods are adequate for representing transients. In this paper we explore the use of the discrete wavelet transform ...
    • Compression-based classification of biological sequences and structures via the Universal Similarity Metric: experimental assessment 

      Ferragina, Paolo; Giancarlo, Raffaele; Greco, Valentina; Manzini, Giovanni; Valiente Feruglio, Gabriel Alejandro (2007-07)
      Article
      Open Access
      Similarity of sequences is a key mathematical notion for Classification and Phylogenetic studies in Biology. It is currently primarily handled using alignments. However, the alignment methods seem inadequate for post-genomic ...
    • Compressió de memòria per a la millora de l'eficiència energètica 

      Zhu Wang, Liang Xiao (Universitat Politècnica de Catalunya, 2008-07-04)
      Master thesis (pre-Bologna period)
      Open Access
    • Customized compression algorithms for the scientific payload of GAIA 

      González Villafranca, Alberto (Universitat Politècnica de Catalunya, 2007-06-28)
      Master thesis
      Open Access
      Gaia is the new astrometric mission of the European Space Agency. It will measure the positions and proper motions of more than one billion stars and other objects with unprecedented accuracy, providing a sample of more ...
    • Data compression of natural signals based on discrete wavelet transform analysis 

      Reig Bolano, Ramon; Marti Puig, Pere; Solé-Casals, Jordi; Parisi Baradad, Vicenç (2009)
      Conference report
      Restricted access - publisher's policy
      In this paper we explore the use of the discrete wavelet transform analysis of an arbitrary signal in order to improve the data compression capability of data coders. Wavelet analysis is widespread used in image codifiers, ...
    • Evaluación de un algoritmo de compresión de datos en arquitectura Cell 

      García Fernández, Alberto (Universitat Politècnica de Catalunya, 2010-05-21)
      Master thesis (pre-Bologna period)
      Open Access
      La finalidad de este proyecto es estudiar y experimentar con la arquitectura Cell BE comercializada por IBM. Actualmente existen muchos fabricantes de procesadores, que a su vez presentan multiples arquitecturas al ...
    • Feasibility study of the PEC compressor in HDFS file format 

      Estepa Sánchez, Carlos (Universitat Politècnica de Catalunya, 2011-11-15)
      Master thesis (pre-Bologna period)
      Open Access
      English: Improvement of the astrometric format GBIN using HFG5+ PEC.
    • Formalism for a multiresolution time series database model 

      Llusà Serra, Aleix; Vila Marta, Sebastià; Escobet Canal, Teresa (2016-03)
      Article
      Open Access
      We formalise a specialised database management system model for time series using a multiresolution approach. These special purpose database systems store time series lossy compressed in a space-bounded storage. Time series ...
    • Immersive data comprehension: visualizing uncertainty in measurable models 

      Brunet Crosa, Pere; Andújar Gran, Carlos Antonio (2015-09-29)
      Article
      Open Access
      Recent advances in 3D scanning technologies have opened new possibilities in a broad range of applications including cultural heritage, medicine, civil engineering, and urban planning. Virtual Reality systems can provide ...
    • Improving web server performance through main memory compression 

      Beltran Querol, Vicenç; Torres Viñals, Jordi; Ayguadé Parra, Eduard (IEEE Computer Society, 2008)
      Conference lecture
      Open Access
      Current web servers are highly multithreaded applications whose scalability benefits from the current multicore/multiprocessor trend. However, some workloads can not capitalize on this because their performance is limited by ...
    • jmpegg 1.0 – the pure java implementation of the MPEG-G ISO/IEC 23092 standard 

      Repchevsky, Dmitry; Naro, Daniel; Royo, Romina; Llorente Viejo, Silvia; Delgado Mercè, Jaime; Gelpi, Josep Lluis (2019-07-14)
      External research report
      Open Access
      High-throughput sequencing technologies consistently produce overwhelming amount of genomic data. This data is extremely important for the biomedical research and has an enormous impact on the progress in healthcare system. ...
    • Lossles Compression of ECG signals - Performance Analysis in a Wireless Network 

      Bayarri Portolés, Laia (Universitat Politècnica de Catalunya, 2009)
      Master thesis (pre-Bologna period)
      Open Access
      With the development of multimedia and digital systems there is a need to reduce the cost of storage and transmission of information. The storage requirements for long signals like 24-hour heart monitoring are very large ...
    • Modulo compresor/encriptador para datacenters 

      Martínez Pérez, Ivan (Universitat Politècnica de Catalunya, 2014-06-26)
      Bachelor thesis
      Open Access
      Propuesta de diseño hardware y software de un módulo compresor/encriptador de datos. La solución software viene acompañada de una implementación en C++.
    • Optimal data compression for lifetime maximization in wireless sensor networks operating in stealth mode 

      Incebacak, Davut; Zilan, Ruken; Tavli, Bulent; Barceló Ordinas, José María; García Vidal, Jorge (Elsevier, 2015-01)
      Article
      Open Access
      Contextual privacy in Wireless Sensor Networks (WSNs) is concerned with protecting contextual information such as whether, when, and where the data is collected. In this context, hiding the existence of a WSN from adversaries ...
    • Performance analysis of a new packet trace compressor based on TCP flow clustering 

      Holanda Filho, Raimir; Verdú Mulà, Javier; García Vidal, Jorge; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2005)
      Conference report
      Open Access
      In this paper we study the properties of a new packet trace compression method based on clustering of TCP flows. With our proposed method, the compression ratio that we achieve is around 3%, reducing the file size, for ...
    • S3Dc: a 3Dc-based volume compression algorithm 

      Yela Reneses, Héctor; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (Eurographics association, 2008)
      Conference report
      Restricted access - publisher's policy
      Volumes acquired for medical purposes are continuously increasing in size, faster than graphic cards memory capacity. Large volumetric datasets do not fit into GPU memory and therefore direct rendering is not possible. ...
    • Software de gestió de dades per a nanosatèl·lits 

      Masip Vela, Albert (Universitat Politècnica de Catalunya, 2019-01-28)
      Bachelor thesis
      Open Access
      Tractament de les dades generades a bord d'un nanosatèl·lit perquè aquestes siguin enviades de manera robusta a terra.
    • Study, design and implementation of robust entropy coders 

      Clotet Altarriba, Marcial (Universitat Politècnica de Catalunya, 2010-07)
      Master thesis (pre-Bologna period)
      Open Access
    • Unification on Compressed Terms 

      Gascón, Adrià (Universitat Politècnica de Catalunya, 2009-09)
      Master thesis
      Open Access
      First-order term unification is an essential concept in areas like functional and logic programming, automated deduction, deductive databases, artificial intelligence, information retrieval, compiler design, etc. We build ...