Now showing items 1-12 of 961

    • Overdetermined partial resolvent kernel for generalized cylinders 

      Carmona Mejías, Ángeles; Jiménez Jiménez, María José (2021)
      Conference lecture
      Open Access
      Overdetermined partial boundary value problems are those where no data are prescribed onpart of the boundary, whereas both the values of the function and of its normal derivative aregiven on another part of the boundary. ...
    • The group inverse of circulant matrices with few parameters 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José; Mitjana Riera, Margarida (2021)
      Conference lecture
      Open Access
      The need of solving linear systems with circulant matrices occursin many problems related to the periodicity of that problem. This class ofsystem appears in many applications that range from numerical solution ofpartial ...
    • On spectra of symmetric Jacobi matrices 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2021)
      Conference lecture
      Open Access
      A square symmetric matrix A is said bisymmetric if AS=SA, whereS is the matrix with ones along the secondary diagonal and zeroselsewhere. We denote by J(a,b) the real symmetric Jacobi matrixwith main ...
    • A semi-parametric joint model for two sequential times to events and one longitudinal covariate 

      Serrat Piè, Carles; Abel Huertas, Jaime; Gómez Melis, Guadalupe (2012)
      Conference lecture
      Open Access
      The present work proposes a joint model for two sequential times to events together with longitudinal information, as an extension of the joint model by Wolfsohn and Tsiatis (1997) for one time to event and one longitudinal ...
    • Network-based ionospheric gradient monitoring to support GBAS 

      Caamaño Albuerne, María; Felux, Michael; Gerbeth, Daniel; Juan Zornoza, José Miguel; González Casado, Guillermo; Sanz Subirana, Jaume (ION Publications (The Institute of navigation), 2019)
      Conference report
      Open Access
      Ionospheric anomalies, like large ionospheric gradients, might produce a difference between the ionospheric error experienced bythe Ground Based Augmentation System (GBAS) reference station and the aircraft on approach. ...
    • Impact of Covid-19 on UPC's moodle platform and ICE's role 

      Prat Farran, Joana d'Arc; Llorens García, Ariadna; Alier Forment, Marc; Salvador Zuriaga, Francesc; Amo Filvà, Daniel (Association for Computing Machinery (ACM), 2020)
      Conference lecture
      Restricted access - publisher's policy
      On March 13 2020 all the Spanish population got confined at their homes, except for those working in essential jobs. For the universities, this meant to go fully online overnight, which presented a number of challenges on ...
    • A Kinematic campaign to evaluate EGNOS 1046 maritime service 

      Ibáñez Segura, Deimos; Rovira Garcia, Adrià; Sanz Subirana, Jaume; Juan Zornoza, José Miguel; González Casado, Guillermo; Alonso Alonso, María Teresa; López-Salcedo, José Antonio; Jia, Huamin; Pancorbo, Fransico Javier; García, Carlos; Martín, Irene; Abadía, Santos Rodrigo (ION Publications (The Institute of navigation), 2019)
      Conference report
      Open Access
      Global Navigation Satellite Systems (GNSSs) have improved the efficiency and accuracy of transportation means. In terms of safety, the European Geostationary Navigation Overlay System (EGNOS) is providing vertical and ...
    • Structure-preserving and re-randomizable RCCA-secure Public Key Encryption and its applications 

      Faonio, Antonio; Fiore, Dario; Herranz Sotoca, Javier; Ràfols, Carla (Springer, 2019)
      Conference report
      Restricted access - publisher's policy
      Re-randomizable RCCA-secure public key encryption (Rand-RCCA PKE) schemes reconcile the property of re-randomizability of the ciphertexts with the need of security against chosen-ciphertexts attacks. In this paper we give ...
    • RTK Feasibility Analysis for GNSS Snapshot Positioning 

      Liu, Xiao; Ribot, Miguel Ángel; Gusi, Adrià; Closas Gómez, Pau; Rovira Garcia, Adrià; Sanz Subirana, Jaume (ION Publications (The Institute of navigation), 2020)
      Conference report
      Restricted access - author's decision
      With snapshot positioning becoming popular for various applications, the present contribution focuses on the feasibility of achieving Real Time Kinematics (RTK) positioning using snapshot data, i.e. a very brief interval ...
    • Ionospheric scintillation model limitations and impact in GNSS-R missions 

      Camps Carmona, Adriano José; González Casado, Guillermo; Juan Zornoza, José Miguel; Hyuk, Park; Barbosa, José (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Open Access
      The ionosphere impacts radio-wave propagation, notably up to a few GHz. The main applications impacted by the ionosphere are GNSS positioning and timing, Earth Observations (especially low frequency SAR missions e.g. ...
    • Graph centralities and cascading failures in networks 

      Comellas Padró, Francesc de Paula; Sánchez, Llorenç (2019)
      Conference report
      Restricted access - publisher's policy
    • Perturbing networks 

      Mitjana Riera, Margarida; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2012)
      Conference lecture
      Open Access
      Semi-definite positive Schrödinger operators on finite connected networks are particular examples of a general class of self-adjoint operators called elliptic operators. Any elliptic operator defines an automorphism on the ...