Browsing by Author "Laoudias, Christos"

Now showing items 1-19 of 19

    • Conference Object  

      ACCES: Offline accuracy estimation for fingerprint-based localization 

      Nikitin, A.; Laoudias, Christos; Chatzimilioudis, Georgios; Karras, P.; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2017)
      In this demonstration we present ACCES, a novel framework that enables quality assessment of arbitrary fingerprint maps and offline accuracy estimation for the task of fingerprint-based indoor localization. Our framework ...
    • Conference Object  

      The airplace indoor positioning platform for Android smartphones 

      Laoudias, Christos; Constantinou, George; Constantinides, Marios; Nicolaou, Silouanos; Zeinalipour-Yazdi, Constantinos D.; Panayiotou, Christos G. (2012)
      In this demonstration paper, we present an indoor positioning system developed for Android smartphones, coined Airplace. To infer the unknown user location we rely on ubiquitous WLANs and exploit Received Signal Strength ...
    • Conference Object  

      Anyplace: A Crowdsourced Indoor Information Service 

      Georgiou, K.; Constambeys, T.; Laoudias, Christos; Petrou, L.; Chatzimilioudis, Georgios; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2015)
      People do most of their activities, business, commerce, entertainment and socializing indoors. As all of these are increasingly aided by online services and indoor spaces are becoming bigger and more complex, there is a ...
    • Conference Object  

      Crowdsourced indoor localization for diverse devices through radiomap fusion 

      Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D.; Panayiotou, Christos G. (IEEE Computer Society, 2013)
      Crowdsourcing is an emerging field that allows to tackle difficult problems by soliciting contributions from common people, rather than trained professionals. In the post-pc era, where smartphones dominate the personal ...
    • Article  

      Crowdsourced trace similarity with smartphones 

      Zeinalipour-Yazdi, Constantinos D.; Laoudias, Christos; Costa, Constantinos; Vlachos, Michail; Andreou, Maria I.; Gunopulos, Dimitrios (2013)
      Smartphones are nowadays equipped with a number of sensors, such as WiFi, GPS, accelerometers, etc. This capability allows smartphone users to easily engage in crowdsourced computing services, which contribute to the ...
    • Article  

      Crowdsourcing with smartphones 

      Chatzimilioudis, Georgios; Konstantinidis, Andreas; Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D. (2012)
      Smartphones can reveal crowdsourcing's full potential and let users transparently contribute to complex and novel problem solving. This emerging area is illustrated through a taxonomy that classifies the mobile crowdsourcing ...
    • Conference Object  

      Demo: Indoor geolocation on multi-sensor smartphones 

      Li, C. -L; Laoudias, Christos; Larkou, G.; Tsai, Y. -K; Zeinalipour-Yazdi, Constantinos D.; Panayiotou, Christos G. (2013)
      In this demo, we present an efficient hybrid indoor positioning solution that uses multi-sensory location-oriented observations, including WiFi, accelerometer, gyroscope and digital compass data, that are widely available ...
    • Conference Object  

      Demonstration abstract: Crowdsourced indoor localization and navigation with Anyplace 

      Petrou, L.; Larkou, G.; Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D.; Panayiotou, Christos G. (IEEE Computer Society, 2014)
      In this demonstration paper, we present the Anyplace system that relies on the abundance of sensory data on smartphones (e.g., WiFi signal strength and inertial measurements) to deliver reliable indoor geolocation information. ...
    • Conference Object  

      Disclosure-free GPS trace search in smartphone networks 

      Zeinalipour-Yazdi, Constantinos D.; Laoudias, Christos; Andreou, Maria I.; Gunopulos, Dimitrios (2011)
      In this paper we present a powerful distributed framework for finding similar trajectories in a smart phone network, without disclosing the traces of participating users. Our framework, coined Smart Trace, exploits ...
    • Conference Object  

      Health Monitoring of WLAN Localization Infrastructure using Smartphone Inertial Sensors 

      Umair Haider, Raja; Laoudias, Christos; Panayiotou, Christos G. (2013)
    • Conference Object  

      Indoor localization accuracy estimation from fingerprint data 

      Nikitin, A.; Laoudias, Christos; Chatzimilioudis, Georgios; Karras, P.; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2017)
      The demand for indoor localization services has led to the development of techniques that create a Fingerprint Map (FM) of sensor signals (e.g., magnetic, Wi-Fi, bluetooth) at designated positions in an indoor space and ...
    • Article  

      Internet-based Indoor Navigation Services 

      Zeinalipour-Yazdi, Constantinos D.; Laoudias, Christos; Georgiou, K.; Chatzimilioudis, Georgios (2017)
      The advances of smartphone technology in recent years is leading to the uptake of a new class of Internet-based Indoor Navigation (IIN) services, which might soon diminish the need of Satellite-based technologies in urban ...
    • Conference Object  

      Mobile Data Management in Indoor Spaces 

      Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2015)
      This advanced seminar presents the fundamental mobile data management concepts behind the realization of innovative indoor information services that deal with all aspects of handling indoor data as a valuable resource, ...
    • Conference Object  

      A Qualitative and Quantitative Evaluation of Differential Signal Strength Fingerprinting Methods 

      Laoudias, Christos; Kim, Sunwoo; Zeinalipour-Yazti, Demetrios; Panayiotou, Christos G. (2019)
      Indoor location systems that rely on WiFi signal strength values from the existing building infrastructure deliver adequate accuracy with no installation cost at the expense of time and effort to populate the signal database. ...
    • Conference Object  

      A Qualitative and Quantitative Evaluation of Differential Signal Strength Fingerprinting Methods 

      Laoudias, Christos; Kim, Sunwoo; Zeinalipour-Yazti, Demetrios; Panayiotou, Christos G. (2019)
      Indoor location systems that rely on WiFi signal strength values from the existing building infrastructure deliver adequate accuracy with no installation cost at the expense of time and effort to populate the signal database. ...
    • Conference Object  

      A realistic evaluation and comparison of indoor location technologies: Experiences and lessons learned 

      Lymberopoulos, D.; Liu, J.; Yang, X.; Choudhury, R. R.; Handziski, V.; Sen, S.; Lemic, F.; Busch, J.; Jiang, Z.; Zou, H.; Jiang, H.; Ashok, A.; Xu, C.; Ghose, A.; Ahmed, N.; Zhang, C.; Xiao, Z.; Wen, H.; Schmid, T.; Lee, D.; Klepal, M.; Beder, C.; Nikodem, M.; Szymczak, S.; Hoffmann, P.; Selavo, L.; Giustiniano, D.; Lenders, V.; Rea, M.; Marcaletti, A.; Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D.; Tsai, Y. -K; Abrudan, T. E.; Markham, A.; Bestmann, A.; Reimann, R.; Li, L.; Zhao, C.; Adler, S.; Schmitt, S.; Lazik, P.; Rajagopal, N.; Rowe, A.; Dentamaro, V.; Colucci, D.; Ambrosini, P.; Ferraz, A. S.; Martins, L. Q. L.; Bello, P.; Alvino, A.; Sark, V.; Pirkl, G.; Hevesi, P. (Association for Computing Machinery, Inc, 2015)
      We present the results, experiences and lessons learned from comparing a diverse set of technical approaches to indoor localization during the 2014 Microsoft Indoor Localization Competition. 22 different solutions to indoor ...
    • Conference Object  

      Simulation Analysis on the Efficiency of STAMP Method 

      Laoudias, Christos; Panayiotou, Christos G.; Markoulidakis, J. G.; Desiniotis, C. (2006)
    • Conference Object  

      SmartTrace: Finding similar trajectories in smartphone networks without disclosing the traces 

      Costa, Constantinos; Laoudias, Christos; Zeinalipour-Yazdi, Constantinos D.; Gunopulos, Dimitrios (2011)
      In this demonstration paper, we present a powerful distributed framework for finding similar trajectories in a smartphone network, without disclosing the traces of participating users. Our framework, exploits opportunistic ...
    • Conference Object  

      Towards planet-scale localization on smartphones with a partial radiomap 

      Konstantinidis, Andreas; Chatzimilioudis, Georgios; Laoudias, Christos; Nicolaou, Silouanos; Zeinalipour-Yazdi, Constantinos D. (2012)
      The majority of smartphone localization systems use Assisted-GPS for fine-grained localization in outdoor spaces or WiFi-based RSS (Received Signal Strength) technologies for coarse-grain positioning in indoor and outdoor ...