Now showing items 1-20 of 151

    • A comparison between experienced and inexperienced video game players’ perceptions 

      Christou, Georgios (2013-12-01)
      In this article we examine the relationship between usability, hedonic attributes and general appeal of two types of video games, first-person shooters, and massively multi-player online role playing games. Through the use ...
    • A continuous link between the disk and half-plane cases of Grace's theorem 

      Lamprecht, Martin (2015-01-01)
      We obtain a continuous link between the disk and half-plane cases of Grace's theorem and new, non-circular zero domains that stay invariant under the Schur–Szegő convolution.
    • A Decentralized Approach for Self-Coexistence among Heterogeneous Networks in TVWS 

      Maloku, Hena; Hamiti, Enver; Limani, Zana; Lesta, Vicky Papadopoulou; Pitsillides, Andreas; Rajarajan, Muttukrishnan (2018-02-01)
      This paper focuses on coexistence and self-coexistence challenges between secondary heterogeneous wireless networks/users sharing TV Whitespace spectrum. The coexistence problems arise from having several primary and ...
    • A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger 

      Mattila, Seppo S.; Pérez-Torres, M. A.; Efstathiou, Andreas; Mimica, Petar; Fraser, Morgan; Kankare, Erkki; Alberdi, A.; Aloy, Miguel Ángel; Heikkilä, T.; Jonker, Peter G.; Lundqvist, Peter; Marti-Vidal, Ivan; Meikle, W. P.S.; Romero-Cañizales, Cristina; Smartt, Stephen J.; Tsygankov, Sergey S.; Varenius, Eskil; Alonso-Herrero, Almudena; Bondi, Marco; Fransson, Claes; Herrero-Illana, Rubén; Kangas, Tuomas; Kotak, Rubina; Ramírez-Olivencia, N.; Väisänen, Petri H.; Beswick, Robert J.; Clements, David L.; Greimel, Robert; Harmanen, Jussi; Kotilainen, Jari K.; Nandra, Kirpaul P.; Reynolds, Thomas M.; Ryder, Stuart D.; Walton, Nicholas A.; Wiik, Kaj J. (2018-08-03)
      Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). We have observed a transient source in the western nucleus of the ...
    • A far-infrared survey at the North Galactic Pole - I. Nearby star-forming galaxies and effect of confused sources on source counts 

      Väisänen, Petri H.; Kotilainen, Jari K.; Juvela, Mika; Mattila, Kalevi; Efstathiou, Andreas; Kahanpää, Jere (2010-01-01)
      We present follow-up observations of the far-infrared (FIR) sources at 90, 150 and 180 μm detected as part of the ISOPHOT EBL project, which has recently measured the absolute surface brightness of the cosmic infrared ...
    • A graph-theoretic network security game 

      Mavronicolas, Marios; Lesta, Vicky Papadopoulou; Philippou, Anna; Spirakis, Paul G. (2008-11-01)
      Consider a network vulnerable to viral infection, where the security software can guarantee safety only to a limited part of it. We model this practical network scenario as a non-cooperative multi-player game on a graph, ...
    • A hierarchical clustering methodology based on genetic programming for the solution of simple cell-formation problems 

      Dimopoulos, Christos; Mort, Neil (2001-01-10)
      The problem of identifying machine cells and corresponding part families in cellular manufacturing has been extensively researched over the last thirty years. However, the complexity of the problem and the considerable ...
    • A mobile crowd sensing application for hypertensive patients 

      Jovanović, Slađana; Jovanović, Milan; Škorić, Tamara; Jokić, Stevan D.; Milovanović, Branislav D.; Katzis, Konstantinos; Bajić, Dragana (2019-01-02)
      Mobile crowd sensing (MCS) is an application that collects data from a network of conscientious volunteers and implements it for the common or personal benefit. This contribution proposes an implementation that collects ...
    • A model for the infrared emission of FSC 10214+4724 

      Efstathiou, Andreas (2006-09-01)
      A model for the infrared emission of the high-redshift ultraluminous infrared galaxy FSC 10214+4724 is presented. The model assumes three components of emission: a dusty torus viewed edge-on, clouds that are associated ...
    • A multi-wavelength view of the central kiloparsec region in the luminous infrared galaxy NGC 1614 

      Herrero-Illana, Rubén; Pérez-Torres, M. A.; Alonso-Herrero, Almudena; Alberdi, A.; Colina, Luis; Efstathiou, Andreas; Hernández-García, Lorena; Miralles-Caballero, Daniel; Väisänen, Petri H.; Packham, Christopher C.; Rajpaul, Vinesh M.; Albert A. Zijlstra, Albert (2014-05-10)
      The Luminous Infrared Galaxy NGC 1614 hosts a prominent circumnuclear ring of star formation. However, the nature of the dominant emitting mechanism in its central ∼100 pc is still under debate. We present sub-arcsecond ...
    • A semi-automated quality assurance toolbox for diagnostic imaging 

      Constantinou, Christodoulos; Grondoudis, Andreas; Christoforou, Andreas; Lanitis, Andreas; Constantinides, Christakis (2014-01-01)
      A prototype software system for supporting the process of data collection and management in Quality Assurance (QA) for diagnostic imaging is presented. The developed system comprises two main units: the Image Processing ...
    • Active galactic nucleus torus models and the puzzling infrared spectrum of IRAS F10214+4724 

      Efstathiou, Andreas; Christopher, Natalie M.; Verma, Aprajita; Siebenmorgen, Ralf (2013-12-01)
      We present a revised model for the infrared emission of the hyperluminous infrared galaxy IRAS F10214+4724 which takes into account recent photometric data from Spitzer and Herschel that sample the peak of its spectral ...
    • Adaptive optics discovery of supernova 2004ip in the nuclear regions of the luminous infrared galaxy IRAS 18293-3413 

      Mattila, Seppo; Väisänen, Petri H.; Farrah, Duncan G.; Efstathiou, Andreas; Meikle, W. P.S.; Dahlén, Tomas; Fransson, Claes; Lira, Paulina; Lundqvist, Peter; Östlin, Göran; Ryder, Stuart D.; Sollerman, Jesper (2007-04-10)
      We report a supernova discovery in Ks-band images from the NAOS CONICA adaptive optics (AO) system on the ESO Very Large Telescope. The images were obtained as part of a near-infrared search for highly obscured supernovae ...
    • Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy 

      Väisänen, Petri H.; Mattila, Seppo S.; Kniazev, A.; Adamo, Angela; Efstathiou, Andreas; Farrah, Duncan G.; Johansson, Peter H.; Östlin, Göran; Buckley, David A.H.; Burgh, Eric B.; Crause, Lisa A.; Hashimoto, Yasuhiro; Lira, Paulina; Loaring, Nicola S.; Nordsieck, Kenneth H.; Romero-Colmenero, Encarni; Ryder, Stuart D.; Still, Martin D.; Albert A. Zijlstra, Albert (2008-03-01)
      We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope of a luminous IR galaxy (LIRG) IRAS 19115-2124. These data are combined with ...
    • AKARI and IRAS: From beam corrections to SEDs 

      Clements, David L.; Rowan-Robinson, Michael; Pearson, Chris; Afonso, José M.; Labouteiller, Vianney; Farrah, Duncan G.; Efstathiou, Andreas; Greenslade, Joshua; Wang, Lingyu (2019-01-01)
      There is significant scientific value to be gained from combining AKARI fluxes with data at other far-infrared (IR) wavelengths from the Infrared Astronomical Satellite (IRAS) and Herschel missions. To be able to do this ...
    • Black spots identification through a Bayesian Networks quantification of accident risk index 

      Gregoriades, Andreas; Mouskos, Kyriacos C. (2013-03-01)
      Traffic accidents constitute a major problem worldwide. One of the principal causes of traffic accidents is adverse driving behavior that is inherently influenced by traffic conditions and infrastructure among other ...
    • BROAD [C II] LINE WINGS AS TRACER of MOLECULAR and MULTI-PHASE OUTFLOWS in INFRARED BRIGHT GALAXIES 

      Janssen, Annemieke W.; Christopher, Natalie M.; Sturm, Eckhard; Veilleux, Sylvain; Contursi, Alessandra; González-Alfonso, Eduardo; Fischer, Jacqueline R.; Davies, Richard I.; Verma, Aprajita; Graciá-Carpio, Javier; Genzel, Reinhardt; Lutz, Dieter; Sternberg, Amiel; Tacconi, Linda J.; Burtscher, Leonard; Poglitsch, Albrecht (2016-05-01)
      We report a tentative correlation between the outflow characteristics derived from OH absorption at 119 μm and [C ii] emission at 158 μm in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this ...
    • Challenges of designing for sociability to enhance player experience in Massively Multi-player Online Role-playing Games 

      Christou, Georgios; Effie Law, Effie; Zaphiris, Panayiotis G.; Ang, Chee Siang (2013-01-31)
      Massively Multi-player Online Role-playing Games (MMORPGs) have become a popular leisure activity. It has been suggested that the reason for their popularity is that they offer a new 'third-place' for people to socialise. ...
    • Chandra and spitzer unveil heavily obscured quasars in the chandra/swire survey 

      Del Carmen Polletta, Maria; Wilkes, Belinda J.; Siana, Brian D.; Lonsdale, Carol J.; Kilgard, Roy E.; Smith, Harding E.; Kim, Dongwoo; Owen, Frazer N.; Efstathiou, Andreas; Jarrett, Thomas H.M.; Stacey, Gordon J.; Franceschini, Alberto; Rowan-Robinson, Michael; Babbedge, Tom S.R.; Berta, Stefano; Fang, Fan; Farrah, Duncan G.; González-Solares, Eduardo A.; Morrison, Glenn E.; Surace, Jason A.; Shupe, David L. (2006-05-10)
      Using the large multiwavelength data set in the Chandra/SWIRE Survey (0.6 deg2 in the Lockman Hole), we show evidence for the existence of highly obscured (Compton-thick) AGNs, estimate a lower limit to their surface ...
    • Characterizing the UV-to-NIR shape of the dust attenuation curve of IR luminous galaxies up to z ~ 2 

      Lo Faro, Barbara; Buat, Véronique; Roehlly, Y.; Álvarez-Márquez, J.; Burgarella, Denis; Silva, Laura Da; Efstathiou, Andreas (2017-12-01)
      In this work, we investigate the far-ultraviolet (UV) to near-infrared (NIR) shape of the dust attenuation curve of a sample of IR-selected dust obscured (ultra)luminous IR galaxies at z~2. The spectral energy distributions ...