Recent Submissions

  • Educational robotics competitions and involved methodological aspects 

    Christoforou, Eftychios G.; Masouras, Panicos; Cheng, Pericles; Avgousti, Sotiris; Tsekos, Nikolaos V.; Panayides, Andreas S.; Georgiou, George K. (2020-01-01)
    The present article provides perspectives on educational robotics competitions based on teaching experiences with university students as well as the organization of “Robotex Cyprus”, a widely-attended annual event. The ...
  • A driving simulator for discovering requirements in complex systems 

    Gregoriades, Andreas; Hadjicosti, Jack; Florides, Christos; Pampaka, Maria; Michail, Harris E. (2015-01-01)
    One of the most critical phases in complex systems design is the requirements engineering process. During this phase, system designers need to accurately elicit, model and validate the desired system based on user requirements. ...
  • Automation and complacency: Insights from a planning task in the transportation domain 

    Avril, Eugénie; Navarro, Jordan; Wioland, Liên; Valéry, Benoît; Govaere, Virginie; Gourc, Didier; Khademi, Koosha; Dimopoulos, Christos; Dargent, Elisabeth; Renaudeau, Nathalie; Cegarra, Julien (2018-01-01)
    Automated systems are becoming increasingly prevalent in our environment. This leads to a new tasks repartition between the human operator and automation. Understanding human-machine cooperation including potential failures ...
  • Will TV White Spaces Increase Telehealth Capability? 

    Jones, Richard; Katzis, Konstantinos (2018-12-26)
    Realizing 'totally connected healthcare' is probably the most important step towards providing both high quality and cost effective patient treatment in the future. Home-based sensing, wearable medical devices and ...
  • Effect of antenna beam pattern and layout on cellular performance in high altitude platform communications 

    Thornton, John; Pearce, David Anthony J.; Grace, David; Oodo, Masayuki; Katzis, Konstantinos; Tozer, Timothy C. (2005-10-01)
    High Altitude Platforms may offer high spectrum efficiency by deploying multi-beam, multi-cell communications networks. The properties of the antennas carried by the HAP payload are key to the effective exploitation of ...
  • Resilience of airborne networks 

    Ahmadi, Hamed; Fontanesi, Gianluca; Katzis, Konstantinos; Shakir, Muhammad Zeeshan; Zhu, Anding (2018-12-18)
    Networked flying platforms can be used to provide cellular coverage and capacity. Given that 5G and beyond networks are expected to be always available and highly reliable, resilience and reliability of these networks must ...
  • Real-time graph visualization tool for vehicular ad-hoc networks: (VIVAGr: VIsualization tool of VAnet Graphs in real-time) 

    Spanakis, Emmanouil G.; Efstathiades, Christodoulos; Pallis, G.; Dikaiakos, Marios D. (2011-09-19)
    In this work we describe VIVAGr, a graphical-oriented real time visualization tool for vehicular ad-hoc network connectivity graphs. This tool enables the effective synthesis of structural, topological, and dynamic ...
  • User-contributed relevance and nearest neighbor queries 

    Efstathiades, Christodoulos; Pfoser, Dieter (2013-08-13)
    Novel Web technologies and resulting applications have lead to a participatory data ecosystem that when utilized properly will lead to more rewarding services. In this work, we investigate the case of Location-based Services ...
  • TwitterViz: Visualizing and exploring the twittersphere 

    Efstathiades, Christodoulos; Antoniou, Helias; Skoutas, Dimitrios; Vassiliou, Yannis (2015-01-01)
    Micro-blogging platforms and social networks are a rich source of spatio-temporal information, which, together with additional information that can be mined from the social network’s structure, makes them extremely valuable ...
  • Cold. Revisiting hub labels on the database for large-scale graphs 

    Efentakis, Alexandros; Efstathiades, Christodoulos; Pfoser, Dieter (2015-01-01)
    Shortest-path computation is a well-studied problem in algorithmic theory. An aspect that has only recently attracted attention is the use of databases in combination with graph algorithms to compute distance queries on ...
  • The implementation of cross-functional teams in SMEs: The impact on the competitive priorities 

    Efstathiades, Andreas; Efstathiades, Christodoulos; Efstathiades, Hariton (2016-01-01)
    The development of cross-functional teams (CFT) so as to safeguard the proper communication between the departments and the achievement of a competitive advantage is one of the major concerns of business organisations ...
  • Similarity search on spatio-textual point sets 

    Efstathiades, Christodoulos; Belesiotis, Alexandros; Pfoser, Dieter; Skoutas, Dimitrios (2016-01-01)
    User-generated content on the Web increasingly has a geo tial dimension, opening new opportunities and challenges location-based services and location-based social netwo for mining and analyzing user behaviors and patterns. ...
  • On radiocoloring hierarchically specified planar graphs: PSPACE-completeness and approximations 

    Andreou, Maria I.; Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2002-01-01)
    Hierarchical specifications of graphs have been widely used in many important applications, such as VLSI design, parallel programming and software engineering. A well known hierarchical specification model, considered in ...
  • Radiocolorings in periodic planar graphs: PSPACE-completeness and efficient approximations for the optimal range of frequencies 

    Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2002-01-01)
    The Frequency Assignment Problem (FAP) in radio networks is the problem of assigning frequencies to transmitters exploiting frequency reuse while keeping signal interference to acceptable levels. The FAP is usually modelled ...
  • The price of defense and fractional matchings 

    Mavronicolas, Marios; Lesta, Vicky Papadopoulou; Persiano, Giuseppe; Philippou, Anna; Spirakis, Paul G. (2006-12-01)
    Consider a network vulnerable to security attacks and equipped with defense mechanisms. How much is the loss in the provided security guarantees due to the selfish nature of attacks and defenses? The Price of Defense was ...
  • The price of defense 

    Mavronicolas, Marios; Michael, Loizos; Lesta, Vicky Papadopoulou; Philippou, Anna; Spirakis, Paul G. (2006-01-01)
    We consider a strategic game with two classes of confronting randomized players on a graph G(V, E): v attackers, each choosing vertices and wishing to minimize the probability of being caught, and a defender, who chooses ...
  • The power of the defender 

    Gelastou, Marina; Mavronicolas, Marios; Lesta, Vicky Papadopoulou; Philippou, Anna; Spirakis, Paul G. (2006-12-01)
    We consider a security problem on a distributed network. We assume a network whose nodes are vulnerable to infection by threats (e.g. viruses), the attackers. A system security software, the defender, is available in the ...
  • Cooperation among access points for enhanced quality of service in dense wireless environments 

    Antoniou, Josephina; Lesta, Vicky Papadopoulou; Libman, Lavy; Pitsillides, Andreas; Dehkordi, Hooman Reisi (2014-01-01)
    The high popularity of Wi-Fi technology for wireless access has led to a common problem of densely deployed access points (APs) in residential or commercial buildings, competing to use the same or overlapping frequency ...
  • NP-completeness results and efficient approximations for radiocoloring in planar graphs 

    Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2000-01-01)
    The Frequency Assignment Problem (FAP) in radio networks is the problem of assigning frequencies to transmitters exploiting frequency reuse while keeping signal interference to acceptable levels. The FAP is usually modelled ...
  • Radiocoloring in planar graphs: Complexity and approximations 

    Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2005-08-31)
    The Frequency Assignment Problem (FAP) in radio networks is the problem of assigning frequencies to transmitters, by exploiting frequency reuse while keeping signal interference to acceptable levels. The FAP is usually ...

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