• Conference Object  

      Bridging Quantities in Tables and Text 

      Ibrahim, Yusra; Riedewald, Mirek; Weikum, Gerhard; Zeinalipour-Yazti, Demetrios (2019)
      There is a wealth of schema-free tables on the Web, holding valuable information about quantities on sales and costs, environmental footprint of cars, health data and more. Table content can only be properly interpreted ...
    • Article  

      Continuous decaying of telco big data with data postdiction 

      Costa, Constantinos; Konstantinidis, Andreas; Charalampous, Andreas; Zeinalipour-Yazti, Demetrios; Mokbel, Mohamed F. (2019)
      In this paper, we present two novel decaying operators for Telco Big Data (TBD), coined TBD-DP and CTBD-DP that are founded on the notion of Data Postdiction. Unlike data prediction, which aims to make a statement about ...
    • Conference Object  

      Decaying Telco Big Data with Data Postdiction 

      Costa, Constantinos; Charalampous, Andreas; Konstantinidis, Andreas; Zeinalipour-Yazti, Demetrios; Mokbel, Mohamed F. (2018)
      In this paper, we present a novel decaying operator for Telco Big Data (TBD), coined TBD-DP (Data Postdiction). Unlike data prediction, which aims to make a statement about the future value of some tuple, our formulated ...
    • Conference Object  

      EPUI: Experimental Platform for Urban Informatics 

      Ge, Xiaoyu; Chrysanthis, Panos K.; Pelechrinis, Konstantinos; Zeinalipour-Yazti, Demetrios (Association for Computing Machinery, 2018)
      Recent studies in urban navigation have revealed new demands (e.g., diversity, safety, happiness, serendipity) for the navigation services that are critical to providing useful recommendations to travelers. This exposes ...
    • Conference Object  

      FMS: Managing Crowdsourced Indoor Signals with the Fingerprint Management Studio 

      Angelidou, Marileni; Costa, Constantinos; Nikitin, Artyom; Zeinalipour-Yazti, Demetrios (2018)
      In this demonstration paper, we present an integrated indoor signal management studio, coined Fingerprint Management Studio (FMS), which provides a spatio-temporal platform to: (i) manage the collection of location-dependent ...
    • Conference Object  

      Future Directions for Indoor Information Systems: A Panel Discussion 

      Zeinalipour-Yazti, Demetrios (2018)
      Geographic Information Systems (GIS) have enabled a vast range of applications in outdoor spaces, but these systems are bound to accurate localization technologies that are not available inside buildings where people carry ...
    • Conference Object  

      Generating Semantic Aspects for Queries 

      Berberich, Klaus; Gupta, Dhruv; Strötgen, Jannik; Zeinalipour-Yazti, Demetrios (2019)
    • Conference Object  

      Generating Semantic Aspects for Queries 

      Berberich, Klaus; Gupta, Dhruv; Strötgen, Jannik; Zeinalipour-Yazti, Demetrios (Association for Computing Machinery, 2018)
      We present an approach to explore news archives by automatically generating semantic aspects for their navigation. Given a keyword query as an input, we utilize semantic annotations present in the pseudo-relevant set of ...
    • Article  

      IoT Data Prefetching in Indoor Navigation SOAs 

      Konstantinidis, Andreas; Irakleous, Panagiotis; Georgiou, Zacharias; Zeinalipour-Yazti, Demetrios; Chrysanthis, Panos K. (2018)
      Internet-based Indoor Navigation Service-Oriented Architectures (IIN-SOA) organize signals collected by IoT-based devices to enable a wide range of novel applications indoors, where people spend 80--90% of their time. In ...
    • 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  

      TBD-DP: Telco Big Data Visual Analytics with Data Postdiction 

      Costa, Constantinos; Charalampous, Andreas; Konstantinidis, Andreas; Zeinalipour-Yazti, Demetrios; Mokbel, Mohamed F. (2018)
      In this demonstration paper, we present the TBD-DP operator, which relies on existing Machine Learning (ML) algorithms to abstract Telco Big Data (TBD) into compact models that can be stored and queried when necessary. Our ...
    • Conference Object  

      Telco Big Data Research and Open Problems 

      Costa, Constantinos; Zeinalipour-Yazti, Demetrios (2019)
      A telecommunication company (telco) is traditionally only perceived as the entity that provides telecommunication services, such as telephony and data communication access to users. However, the radio and backbone ...
    • Conference Object  

      Telco Big Data: Current State Future Directions 

      Costa, Constantinos; Zeinalipour-Yazti, Demetrios (2018)
      A Telecommunication company (Telco) is traditionally only perceived as the entity that provides telecommunication services, such as telephony and data communication access to users. However, the radio and backbone ...
    • Conference Object  

      Towards Robust Methods for Indoor Localization using Interval Data 

      Ramdani, Nacim; Zeinalipour-Yazti, Demetrios; Karamousadakis, Michalis; Panayides, Andreas (2019)
      Indoor localization has gained an increase in interest recently because of the wide range of services it may provide by using data from the Internet of Things. Notwithstanding the large variety of techniques available, ...