Now showing items 1-20 of 24

    • 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 ...
    • An autoencoder-based solution for IQ constellation analysis 

      Ruiz Ramírez, Marc; Morales López, Javier; Sequeira, Diogo Gonçalo; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Open Access
      A method for IQ constellation analysis based on Autoencoders is proposed. Exhaustive numerical results show accurate physical metric prediction and large data compression, while providing useful model explainability.
    • 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 ...
    • Compressed Representation of 3D Models for 3D Printing 

      Ballesteros Brandão, João Hugo (Universitat Politècnica de Catalunya, 2020-06-23)
      Master thesis
      Open Access
      In this work we tackle the issue of large file sizes in disk of volume data representations of 3D models when used for 3D printing purposes. In the pipeline of 3D printing software, the representation, in disk, of the model ...
    • Compression of multibeam echosounders bathymetry and water column data 

      Martí, Aniol; Portell de Mora, Jordi; Amblàs Novellas, David; Cabrera Estanyol, Ferran de; Vila Insa, Marc; Riba Sagarra, Jaume; Mitchell, Garrett (Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-25)
      Article
      Open Access
      Over the past decade, Multibeam Echosounders (MBES) have become one of the most used techniques in sea exploration. Modern MBES are capable of acquiring both bathymetric information on the seafloor and the reflectivity of ...
    • 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
    • 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, ...
    • Deep Colorization networks for image compression 

      Borràs Sans, Guillem (Universitat Politècnica de Catalunya, 2021-06-30)
      Bachelor thesis
      Open Access
      Considering the billions of pictures stored world wide and the rising of streaming services, image compression is, nowadays, a very important field. In this TFG we propose a lossless framework to compress images that takes ...
    • 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 ...
    • (La imposibilidad de) el compresor infinito 

      García Quiles, Pau (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 2003)
      Article
      Open Access
    • 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)
      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. ...
    • 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 ...
    • Payload data handling, telemetry and data compression systems for Gaia. 

      Portell i de Mora, Jordi (Universitat Politècnica de Catalunya, 2005-09-26)
      Doctoral thesis
      Open Access
      Gaia, la nova missió astromètrica de la ESA amb un llançament previst pel 2011, observarà més de mil milions d'estels i altres objectes amb una exactitud sense precedents. Els seus ambiciosos objectius desbanquen completament ...
    • 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 ...