Browsing School of Information Sciences by Title

Now showing items 89-108 of 162

  • Localizing global descriptors for content-based image retrieval 

    Iakovidou, Chryssanthi; Anagnostopoulos, Nektarios; Kapoutsis, Athanasios; Boutalis, Yiannis; Lux, Mathias; Chatzichristofis, Savvas A. (Springer, 2015)
    In this paper, we explore, extend and simplify the localization of the description ability of the well-established MPEG-7 (Scalable Colour Descriptor (SCD), Colour Layout Descriptor (CLD) and Edge Histogram Descriptor ...

  • A LoCATe‐based visual place recognition system for mobile robotics and GPGPUs 

    Bampis, Loukas; Chatzichristofis, Savvas A.; Iakovidou, Chryssanthi; Gasteratos, Antonios; Boutalis, Yiannis; Amanatiadis, Angelos (John Wiley & Sons Ltd, 2017-05)
    In this paper, a novel visual Place Recognition approach is evaluated based on a visual vocabulary of the Color and Edge Directivity Descriptor (CEDD) to address the loop closure detection task. Even though CEDD was initially ...

  • Mean Normalized Retrieval Order (MNRO): a new content-based image retrieval performance measure 

    Chatzichristofis, Savvas A.; Iakovidou, Chryssanthi; Boutalis, Yiannis S.; Angelopoulou, Elli (Springer, 2014)
    The results of a content based image retrieval system can be evaluated by several performance measures, each one employing different evaluation criteria. Many of the methods used in the field of information retrieval have ...

  • Mobility in WSNs for Critical Applications 

    Silva, Ricardo; Zinonos, Zinon; Sá Silva, Jorge; Vassiliou, Vasos (IEEE, 2011)
    Recent critical application sectors of sensor networks like military, health care, and industry require the use of mobile sensor nodes, something that poses unique challenges in aspects like handoff delay, packet loss, and ...

  • Mobility Management in WSNs using Fuzzy Logic: An Industrial Application Scenario 

    Zinonos, Zinon; Chrysostomou, Chrysostomos; Vassiliou, Vasos (IEEE, 2012)
    Mobility management in Wireless Sensor Networks is considered to be of an up most importance for today's critical applications. In this paper, we present a soft mobility management solution where the mobility procedures ...

  • A Multi-Objective Exploration Strategy for Mobile Robots Under Operational Constraints 

    Amanatiadis, Angelos A.; Chatzichristofis, Savvas A.; Charalampous, Konstantinos; Doitsidis, Lefteris; Kosmatopoulos, Elias B.; Tsalides, Phillipos; Gasterato, Antonios; Roumeliotis, Stergios I. (IEEE, 2013)
    Multi-objective robot exploration constitutes one of the most challenging tasks for autonomous robots performing in various operations and different environments. However, the optimal exploration path depends heavily on ...

  • Multimedia Search with Noisy Modalities: Fusion and Multistage Retrieval 

    Arampatzis, Avi; Chatzichristofis, Savvas A.; Zagoris, Konstantinos (ImageClef, Wikipedia Retrieval Task, 2010)
    We report our experiences from participating to the controlled experiment of the ImageCLEF 2010 Wikipedia Retrieval task. We built an experimental search engine which combines multilingual and multi-image search, employing ...

  • The NOPTILUS project overview: A fully-autonomous navigation system of teams of AUVs for static/dynamic underwater map construction 

    Kapoutsis, A. Ch.; Salavasidis, G. V.; Chatzichristofis, Savvas A.; Braga, J.; Pinto, J.; Borges de Sousa, Joao; Kosmatopoulos, E. B. (IFAC (International Federation of Automatic Control), 2015)
    Within the project NOPTILUS, a fully functional system/methodology had been developed that allows the cooperative, fully-autonomous navigation of teams of AUVs when deployed in Static or Dynamic Underwater Map Construction ...

  • Notarization of Knowledge Retrieval from Biomedical Repositories Using Blockchain Technology 

    Mytis-Gkometh, P.; Drosatos, G.; Efraimidis, P. S.; Kaldoudi, E. (International Conference on Biomedical and Health Informatics, 2017)
    Biomedical research and clinical decision depend increasingly on a number of authoritative databases, mostly public and continually enriched via peer scientific contributions. Given the dynamic nature of data and their ...

  • A novel cellular automata based technique for visual multimedia content encryption 

    Chatzichristofis, Savvas A.; Mitzias, Dimitris A.; Sirakoulis, Georgios Ch.; Boutalis, Yiannis S. (Elsevier, 2010)
    This paper proposes a new method for visual multimedia content encryption using Cellular Automata (CA). The encryption scheme is based on the application of an attribute of the CLF XOR filter, according to which the original ...

  • A Novel Image Retrieval Based on Visual Words Integration of SIFT and SURF 

    Ali, Nouman; Bajwa, Khalid Bashir; Sablatnig, Robert; Chatzichristofis, Savvas A.; Iqbal, Zeshan; Rashid, Muhammad; Habib, Hafiz Adnan (2016)
    With the recent evolution of technology, the number of image archives has increased exponentially. In Content-Based Image Retrieval (CBIR), high-level visual information is represented in the form of low-level features. ...

  • An Online Service for Topics and Trends Analysis in Medical Literature 

    Kavvadias, Spyridon; Drosatos, George; Kaldoudi, Eleni (IFMBE Proceedings, 2018-05)
    Topic modeling refers to a suite of probabilistic algorithms for extracting word patterns from a collection of documents aiming for data clustering and detection of research trends. We developed an online service that ...

  • An Ontology Based Scheme for Formal Care Plan Meta-Description 

    Kaldoudi, E.; Drosatos, G.; Portokallidis, N.; Third, A. (IFMBE Proceedings 57, 2016)
    Contemporary healthcare delivery is based on state-of-the-art scientific best practices captured in systematically developed formal care plans which include guidelines, clinical protocols, integrated care pathways, etc. ...

  • ParkChain: An IoT Parking Service Based on Blockchain 

    Zinonos, Zinon; Christodoulou, Panayiotis; Andreou, Andreas; Chatzichristofis, Savvas A. (IEEE, 2019-08-19)
    The IoT ecosystem is evolving quickly, developing several applications in different sectors. The majority of these applications use centralized infrastructures something that poses several challenges especially related to ...

  • Pay-as-you-go data integration for linked data: opportunities, challenges and architectures 

    Christodoulou, Klitos; Paton, Norman W.; Fernandes, Alvaro A.A.; Parsia, Bijan; Hedeler, Cornelia (ACM Digital Library, 2012)
    Linked Data (LD) provides principles for publishing data that underpin the development of an emerging web of data. LD follows the web in providing low barriers to entry: publishers can make their data available using a ...

  • Performance Study of the Most Commonly Used Image Retrieval Evaluation Methods 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (ACTA PRESS, 2010)
    One of the most significant problems in the field of image retrieval results from the lack of a common test bed for the evaluation of the systems. So far, many of the methods used in the field of information retrieval ...

  • PHUBMIT - A new smart intervention for estimating and mitigating the cell phone induced ostracism (phubbing) 

    Drosatos, George; Tsoumani, Olga; Geronikolou, Styliani (University Research Institute of Maternal and Child Health and Precision Medicine, 2018)
    Phubbing or the cell phone-induced ostracism is defined as “snubbing someone by being busy oneself with one’s mobile phone and ignore social surroundings”. Thus, “phubber” is the subject, whereas, ‘phubbee’ is the target ...

  • Privacy Leakages about Political Beliefs through Analysis of Twitter Followers 

    Briola, Helen; Drosatos, George; Stamatelatos, Giorgos; Gyftopoulos, Sotirios; Efraimidis, Pavlos S. (Pan-Hellenic Conference on Informatics, 2018-11)
    In this paper, we focus on privacy leakages about Twitter usersand show that simply establishing follower and friend connectionsin the Twitter network might be enough to reveal sensitive in-formation about the political ...

  • Privacy Leakages about Political Beliefs through Analysis of Twitter Followers 

    Briola, Helen; Drosatos, George; Stamatelatos, Giorgos; Gyftopoulos, Sotirios; Efraimidis, Pavlos S. (ICPS Proceedings, 2018-11)
    In this paper, we focus on privacy leakages about Twitter users and show that simply establishing follower and friend connections in the Twitter network might be enough to reveal sensitive information about the political ...

  • A Privacy-by-Design Contextual Suggestion System for Tourism 

    Efraimidis, Pavlos S.; Drosatos, George; Arampatzis, Avi; Stamatelatos, Giorgos; Athanasiadis, Ioannis N. (MDPI, 2016-05-05)
    We focus on personal data generated by the sensors and through the everyday usage of smart devices and take advantage of these data to build a non-invasive contextual suggestion system for tourism. The system, which we ...