Listar INIT_Congressos i Informes por fecha de publicación

Mostrando ítems 21-40 de 95

    • closedAccess   Lightweight Hybrid CNN-ELM Model for Multi-building and Multi-floor Classification 

      Quezada Gaibor, Darwin; Torres-Sospedra, Joaquín; Nurmi, Jari; Koucheryavy, Yevgeni; Huerta, Joaquin IEEE (2022)
      Machine learning models have become an essential tool in current indoor positioning solutions, given their high capabilities to extract meaningful information from the environment. Convolutional neural networks (CNNs) ...

    • closedAccess   Towards Accelerated Localization Performance Across Indoor Positioning Datasets 

      Klus, Lucie; Quezada Gaibor, Darwin; Torres-Sospedra, Joaquín; Lohan, Elena Simona; Granell, Carlos; Nurmi, Jari IEEE (2022)
      The localization speed and accuracy in the indoor scenario can greatly impact the Quality of Experience of the user. While many individual machine learning models can achieve comparable positioning performance, their ...

    • openAccess   A Low-Cost Control Occupancy Solution Using a Time-of-Flight Ranging Sensor Laser 

      Bartrés Jurado, Enric; Trilles, Sergio; Perez-Navarro, Antoni; Torres-Sospedra, Joaquín CEUR Workshop Proceedings (2022)
      The pandemic situation has driven to several measures to prevent the spread of COVID-19. One of these measures is social distance and, as a consequence, limitation of capacity of indoor closed spaces. This makes necessary ...

    • closedAccess   Data Cleansing for Indoor Positioning Wi-Fi Fingerprinting Datasets 

      Quezada Gaibor, Darwin; Klus, Lucie; Torres-Sospedra, Joaquín; Lohan, Elena Simona; Nurmi, Jari; Granell, Carlos; Huerta, Joaquin IEEE (2022)
      Wearable and IoT devices requiring positioning and localisation services grow in number exponentially every year. This rapid growth also produces millions of data entries that need to be pre-processed prior to being ...

    • openAccess   Lightweight Wi-Fi Fingerprinting with a Novel RSS Clustering Algorithm 

      Quezada Gaibor, Darwin; Torres-Sospedra, Joaquín; Nurmi, Jari; Koucheryavy, Yevgeni; Huerta, Joaquin IEEE (2021-11-29)
      Nowadays, several indoor positioning solutions sup-port Wi-Fi and use this technology to estimate the user position. It is characterized by its low cost, availability in indoor and outdoor environments, and a wide variety ...

    • openAccess   Towards Ubiquitous Indoor Positioning: Comparing Systems across Heterogeneous Datasets 

      Torres-Sospedra, Joaquín; Silva, Ivo; Klus, Lucie; Quezada Gaibor, Darwin; Crivello, Antonino; Barsocchi, Paolo; Pendão, Cristiano; Lohan, Elena Simona; Nurmi, Jari; Moreira, Adriano IEEE (2021-11-29)
      The evaluation of Indoor Positioning Systems (IPSs) mostly relies on local deployments in the researchers’ or partners’ facilities. The complexity of preparing comprehensive experiments, collecting data, and considering ...

    • openAccess   Transfer Learning for Convolutional Indoor Positioning Systems 

      Klus, Roman; Klus, Lucie; Talvitie, Jukka; Pihlajasalo, Jaakko; Torres-Sospedra, Joaquín; Valkama, Mikko IEEE (2021-11-29)
      Fingerprinting is a widely used technique in indoor positioning, mainly due to its simplicity. Usually, this technique is used with the deterministic k - Nearest Neighbors (k-NN) algorithm. Utilizing a neural network model ...

    • closedAccess   Unsupervised detection of transitions at home by using BLE technology 

      Montoliu Colás, Raul; Sansano-Sansano, Emilio IEEE (2021-11)
      This paper presents a set of unsupervised methods based on Bluetooth Low Energy (BLE) technology to obtain the position and transitions that users perform between the zones where they usually stay longer in their own homes. ...

    • openAccess   Optimal Receivers Location for Passive Indoor Positioning based on BLE 

      De Brouwer, Roald; Torres-Sospedra, Joaquín; Trilles, Sergio; Berkvens, Rafael CEUR Workshop Proceedings (2021-11)
      Indoor Positioning Systems are attracting many researchers, being Bluetooth Low Energy gaining some attention recently. The recent need to track people, ensuring low density of people in some areas, made the research ...

    • openAccess   Coupling Helmholtz resonators for sound manipulation 

      SABAT, ROBINE; Leveque, Gaëtan; pennec, yan; Torrent, Daniel; Djafari Rouhani, Bahram IEEE (2021-09-20)
      In this work, we discuss the interaction between Helmholtz resonators, using the finite element method. We show that the coupling between two spheres gives rise to two resonant modes at low frequencies. One is symmetric ...

    • openAccess   Reproducible Research and GIScience: An Evaluation Using GIScience Conference Papers 

      Ostermann, Frank; Nüst, Daniel; Granell, Carlos; Hofer, Barbara; Konkol, Markus Schloss Dagstuhl Leibniz-Zentrum für Informatik GmbH (2021-09-14)
      GIScience conference authors and researchers face the same computational reproducibility challenges as authors and researchers from other disciplines who use computers to analyse data. Here, to assess the reproducibility ...

    • openAccess   Modeling excess weight in Spain by using deterministic and random differential equations 

      Calatayud, Julia Universitat Politècnica de València (2021-07-14)
      In this work, the aim is to model the data from the Spanish National Health Survey (ENSE) 2017, which gathers the percentage of overweight and obese adults in Spain from 1987 to 2017. A compartmental system of differential ...

    • openAccess   Anonymous Attribute-based Credentials in Collaborative Indoor Positioning Systems 

      Casanova-Marqués, Raúl; Pascacio, Pavel; Hajny, Jan; Torres-Sospedra, Joaquín SciTePress (2021-07-06)
      Collaborative Indoor Positioning Systems (CIPSs) have recently received considerable attention, mainly because they address some existing limitations of traditional Indoor Positioning Systems (IPSs). In CIPSs, Bluetooth ...

    • openAccess   Single-pixel spatial frequency domain imaging with integrating detection 

      Lenz, Armin; Clemente, Pere; Climent, Vicent; Lancis, Jesús; Tajahuerce, Enrique Optica Publishing Group (2021-06-20)
      We present a spatial frequency domain imaging (SFDI) system based on single-pixel imaging (SPI) techniques with a single digital micromirror device (DMD) modulating simultaneously the sinusoidal pattern and the spatial ...

    • openAccess   Ensembling Multiple Radio Maps with Dynamic Noise in Fingerprint-based Indoor Positioning 

      Torres-Sospedra, Joaquín; Aranda Polo, Fernando Jesús; Álvarez, Fernando J.; Quezada Gaibor, Darwin; Silva, Ivo; Pendão, Cristiano; Moreira, Adriano Institute of Electrical and Electronics Engineers (2021-06-15)
      Fingerprint-based indoor positioning is widely used in many contexts, including pedestrian and autonomous vehicles navigation. Many approaches have used traditional Machine Learning models to deal with fingerprinting, ...

    • openAccess   Smartphone Distance Estimation Based on RSSI-Fuzzy Classification Approach 

      Pascacio, Pavel; Casteleyn, Sven; Torres-Sospedra, Joaquín Institute of Electrical and Electronics Engineers (2021-06-15)
      Positioning people indoors has known an exponential growth in the last few years, especially thanks to Bluetooth Low Energy (BLE) technology and the Received Signal Strength Indicator (RSSI) technique. This approach is ...

    • openAccess   Characterising Players of a Cube Puzzle Game with a Two-level Bag of Words 

      Anadón, Xavier; Sanahuja, Pablo; Traver, V. Javier; Lopez, Angeles; Ribelles, Jose Association for Computing Machinery (ACM) (2021-06)
      This work explores an unsupervised approach for modelling players of a 2D cube puzzle game with the ultimate goal of customising the game for particular players based solely on their interaction data. To that end, user ...

    • openAccess   Local-level Analysis of Positioning Errors in Wi-Fi Fingerprinting 

      Mendoza-Silva, Germán Martín; Torres-Sospedra, Joaquín; Huerta, Joaquin IEEE (2021-04-25)
      Nowadays, Location Based Services run over a net of heterogeneous devices (mainly smartphones) with different location capabilities thanks to, for instance, signals of opportunity as Wi-Fi. In contrast to professional ...

    • openAccess   Towards Gender Equality in Education and Career in the Earth Observation and GI Sector 

      Riedler, Barbara; Stephenne, Nathalie; Aguilar Moreno, Estefanía; Jagaille, Marie; Monfort Muriach, Aida; Fiore, Grazia; Antoniou, Natassa Copernicus GmbH (2021)
      Gender inequality is omnipresent in our society and in the field of education and training, the gender gap is especially evident in STEM (Science, Technology, Engineering and Mathematics) disciplines. While different studies ...

    • openAccess   Generalized Scalable Neighborhood Component Analysis for Single and Multi-Label Remote Sensing Image Characterization 

      kang, jian; SCARANO, Antonio; Plaza, Antonio IEEE (2021)
      Deep metric learning has recently become a prominent technology for the semantic understanding ofremote sensing (RS) scenes due to its great potential for characterizing visual semantics. However, state-of-the-art deep ...