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Displaying 1-28 out of 28 total
Crowdsourcing for Mobile Data Management
Found in: 2013 14th IEEE International Conference on Mobile Data Management (MDM)
By Georgios Chatzimilioudis,Demetrios Zeinalipour-Yazti
Issue Date:June 2013
pp. 3-4
Crowdsourcing refers to a distributed problemsolving model in which a crowd of undefined size is engaged in the task of solving a complex problem through an open call. This novel problem-solving model found its way into numerous applications on the web for...
 
pFusion: A P2P Architecture for Internet-Scale Content-Based Search and Retrieval
Found in: IEEE Transactions on Parallel and Distributed Systems
By Demetrios Zeinalipour-Yazti, Vana Kalogeraki, Dimitrios Gunopulos
Issue Date:June 2007
pp. 804-817
<p><b>Abstract</b>—The emerging Peer-to-Peer (P2P) model has become a very powerful and attractive paradigm for developing Internet-scale systems for sharing resources, including files and documents. The distributed nature of these system...
 
CLODA: A Crowdsourced Linked Open Data Architecture
Found in: 2013 14th IEEE International Conference on Mobile Data Management (MDM)
By Georgios Larkou,Julia Metochi,Georgios Chatzimilioudis,Demetrios Zeinalipour-Yazti
Issue Date:June 2013
pp. 104-109
In this paper we present our Crowdsourced Linked Open Data Architecture (CLODA), a first attempt to combine crowdsourcing, localization and location-based services to generate, collect, validate and relate real-world, geo-spatial and multi-dimensional info...
 
Perimeter-Based Data Replication in Mobile Sensor Networks
Found in: Mobile Data Management, IEEE International Conference on
By Panayiotis Andreou, Demetrios Zeinalipour-Yazti, Maria Andreou, Panos K. Chrysanthis, George Samaras
Issue Date:May 2009
pp. 244-251
This paper assumes a set of n mobile sensors that move in the Euclidean plane as a swarm. Our objectives are to explore a given geographic region by detecting spatio-temporal events of interest and to store these events in the network until the user reques...
 
Crowdsourced Trace Similarity with Smartphones
Found in: IEEE Transactions on Knowledge and Data Engineering
By Demetrios Zeinalipour-Yazti,Christos Laoudias,Constandinos Costa,Michail Vlachos,Maria I. Andreou,Dimitrios Gunopulos
Issue Date:June 2013
pp. 1240-1253
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 solution of complex problems in a distr...
 
Multi-objective Query Optimization in Smartphone Social Networks
Found in: Mobile Data Management, IEEE International Conference on
By Andreas Konstantinidis,Demetrios Zeinalipour-Yazti,Panayiotis Andreou,George Samaras
Issue Date:June 2011
pp. 27-32
The bulk of social network applications for smart phones (e.g., Twitter, Face book, Foursquare, etc.) currently rely on centralized or cloud-like architectures in order to carry out their data sharing and searching tasks. Unfortunately, the given model int...
 
MINT Views: Materialized In-Network Top-k Views in Sensor Networks
Found in: Mobile Data Management, IEEE International Conference on
By Demetrios Zeinalipour-Yazti, Panayiotis Andreou, Panos K. Chrysanthis, George Samaras
Issue Date:May 2007
pp. 182-189
No summary available.
 
Crowdsourcing with Smartphones
Found in: IEEE Internet Computing
By Georgios Chatzimilioudis,Andreas Konstantinidis,Christos Laoudias,Demetrios Zeinalipour-Yazti
Issue Date:September 2012
pp. 36-44
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 field and through three new app...
 
KSpot: Effectively Monitoring the K Most Important Events in a Wireless Sensor Network
Found in: Data Engineering, International Conference on
By Panayiotis Andreou, Demetrios Zeinalipour-Yazti, Martha Vassiliadou, Panos K. Chrysanthis, George Samaras
Issue Date:April 2009
pp. 1503-1506
This demo presents a graphical user interface and ranking system, coined KSpot, for effectively monitoring the K highest-ranked answers to a query Q in a Wireless Sensor Network. KSpot deploys state-of-the-art distributed Top-k query processing algorithms ...
 
Identifying Failures in Grids through Monitoring and Ranking
Found in: Network Computing and Applications, IEEE International Symposium on
By Demetrios Zeinalipour-Yazti, Kyriacos Neocleous, Chryssis Georgiou, Marios D. Dikaiakos
Issue Date:July 2008
pp. 291-298
In this paper we present FailRank, a novel framework for integrating and ranking information sources that characterize failures in a grid system. After the failing sites have been ranked, these can be eliminated from the job scheduling resource pool yieldi...
 
Workload-Aware Query Routing Trees in Wireless Sensor Networks
Found in: Mobile Data Management, IEEE International Conference on
By Panayiotis Andreou, Demetrios Zeinalipour-Yazti, Panos K. Chrysanthis, George Samaras
Issue Date:April 2008
pp. 189-196
Continuous queries in wireless sensor networks are established on the premise of a routing tree that provides each sensor with a path over which answers can be transmitted to the query processor. We found that these structures are sub-optimality constructe...
 
Disclosure-Free GPS Trace Search in Smartphone Networks
Found in: Mobile Data Management, IEEE International Conference on
By Demetrios Zeinalipour-Yazti,Christos Laoudias,Maria I. Andreou,Dimitrios Gunopulos
Issue Date:June 2011
pp. 78-87
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 opportunistic and participatory sensing i...
 
Information Retrieval Techniques for Peer-to-Peer Networks
Found in: Computing in Science and Engineering
By Demetrios Zeinalipour-Yazti, Vana Kalogeraki, Dimitrios Gunopulos
Issue Date:July 2004
pp. 20-26
Peer-to-peer (P2P) systems are application-layer networks that let networked hosts share resources in a distributed environment. An important attribute of P2P networks is the ability to efficiently search the contents of other peers. In this article, the a...
 
Continuous All k-Nearest-Neighbor Querying in Smartphone Networks
Found in: 2012 13th IEEE International Conference on Mobile Data Management (MDM)
By Georgios Chatzimilioudis,Demetrios Zeinalipour-Yazti,Wang-Chien Lee,Marios D. Dikaiakos
Issue Date:July 2012
pp. 79-88
Consider a centralized query operator that identifies to every smart phone user its k geographically nearest neighbors at all times, a query we coin Continuous All k-Nearest Neighbor (CAkNN). Such an operator could be utilized to enhance public emergency s...
 
SmartP2P: A Multi-objective Framework for Finding Social Content in P2P Smartphone Networks
Found in: 2012 13th IEEE International Conference on Mobile Data Management (MDM)
By Andreas Konstantinidis,Christos Aplitsiotis,Demetrios Zeinalipour-Yazti
Issue Date:July 2012
pp. 324-327
In this demonstration paper, we present a novel framework for searching objects (e.g., images, videos, etc.) captured by the users in a mobile social community. Our framework, is founded on an in-situ data storage model, where captured objects remain local...
 
SmartTrace: Finding similar trajectories in smartphone networks without disclosing the traces
Found in: Data Engineering, International Conference on
By Costandinos Costa,Christos Laoudias,Demetrios Zeinalipour-Yazti,Dimitrios Gunopulos
Issue Date:April 2011
pp. 1288-1291
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 and participatory sensing in orde...
 
Distributed Top-K Query Processing in Wireless Sensor Networks
Found in: Mobile Data Management, IEEE International Conference on
By Demetrios Zeinalipour-Yazti, Zografoula Vagena
Issue Date:April 2008
pp. 227
Wireless Sensor Networks create an innovative technology that enables users to monitor and study the physical world at an extremely high resolution. Query processing in such ad-hoc environments is a challenging task due to the complexities imposed by the i...
   
Intensive Care Window: A Multi-Modal Monitoring Tool for Intensive Care Research and Practice
Found in: Computer-Based Medical Systems, IEEE Symposium on
By Harald Gjermundrod, Marios Papa, Demetrios Zeinalipour-Yazti, Marios D. Dikaiakos, George Panayi, Theodoros Kyprianou
Issue Date:June 2007
pp. 471-476
Intensive Care Units are widely considered as the most technologically advanced environments within a hospital. In such environments, physicians are confronted with multiple medical devices that monitor the inpatients. The capability to collect, store, pro...
 
The MicroPulse Framework for Adaptive Waking Windows in Sensor Networks
Found in: Mobile Data Management, IEEE International Conference on
By Demetrios Zeinalipour-Yazti, Panayiotis Andreou, Panos K. Chrysanthis, George Samaras, Andreas Pitsillides
Issue Date:May 2007
pp. 351-355
No summary available.
 
The Airplace Indoor Positioning Platform for Android Smartphones
Found in: 2012 13th IEEE International Conference on Mobile Data Management (MDM)
By Christos Laoudias,George Constantinou,Marios Constantinides,Silouanos Nicolaou,Demetrios Zeinalipour-Yazti,Christos G. Panayiotou
Issue Date:July 2012
pp. 312-315
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 (RSS) values from neighboring Acces...
 
Towards planet-scale localization on smartphones with a partial radiomap
Found in: Proceedings of the 4th ACM international workshop on Hot topics in planet-scale measurement (HotPlanet '12)
By Andreas Konstantinidis, Christos Laoudias, Demetrios Zeinalipour-Yazti, Georgios Chatzimiloudis, Silouanos Nicolaou
Issue Date:June 2012
pp. 9-14
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 spaces. The former consumes precio...
     
Demo: the airplace indoor positioning platform
Found in: Proceedings of the 10th international conference on Mobile systems, applications, and services (MobiSys '12)
By Christos G. Panayiotou, Christos Laoudias, Demetrios Zeinalipour-Yazti, George Constantinou, Marios Constantinides, Silouanos Nicolaou
Issue Date:June 2012
pp. 467-468
In this demo paper, we present the Airplace indoor positioning platform developed for Android smartphones [1]. Airplace relies on existing WLAN infrastructure and exploits Received Signal Strength (RSS) values from neighboring Access Points (AP) to infer t...
     
Demo: a programming cloud of smartphones
Found in: Proceedings of the 10th international conference on Mobile systems, applications, and services (MobiSys '12)
By Andreas Konstantinidis, Constantinos Costa, Demetrios Zeinalipour-Yazti, Georgios Larkou
Issue Date:June 2012
pp. 465-466
In this demonstration we present SmartLab1, an exciting experimental testbed of approximately 40+ real Android Smartphones, plus emulated devices, deployed at the Department of Computer Science building at the University of Cyprus. SmartLab provides a publ...
     
Data management techniques for smartphone networks
Found in: Proceedings of the 10th ACM International Workshop on Data Engineering for Wireless and Mobile Access (MobiDE '11)
By Demetrios Zeinalipour-Yazti
Issue Date:June 2011
pp. 25-25
Smartphone devices have emerged as powerful computational platforms equipped with multitude of sensors that are capable of generating vast amounts of data (geo-location, audio, video, etc.) Collections of such devices connected to the Internet yield Smartp...
     
Minimum-hot-spot query trees for wireless sensor networks
Found in: Proceedings of the Ninth ACM International Workshop on Data Engineering for Wireless and Mobile Access (MobiDE '10)
By Demetrios Zeinalipour-Yazti, Dimitrios Gunopulos, Georgios Chatzimilioudis
Issue Date:June 2010
pp. 33-40
We propose a distributed algorithm to construct a balanced communication tree that serves in gathering data from the network nodes to a sink. Our algorithm constructs a near-optimally balanced communication tree with minimum overhead. The balancing of the ...
     
FSort: external sorting on flash-based sensor devices
Found in: Proceedings of the Sixth International Workshop on Data Management for Sensor Networks (DMSN '09)
By Demetrios Zeinalipour-Yazti, George Samaras, Orestis Spanos, Panayiotis Andreou, Panos K. Chrysanthis
Issue Date:August 2009
pp. 1-8
In long-term deployments of Wireless Sensor Networks, it is often more efficient to store sensor readings locally at each device and transmit those readings to the user only when requested (i.e., in response to a user query). Many of the techniques that co...
     
SenseSwarm: a perimeter-based data acquisition framework for mobile sensor networks
Found in: Proceedings of the 4th workshop on Data management for sensor networks: in conjunction with 33rd International Conference on Very Large Data Bases (DMSN '07)
By Demetrios Zeinalipour-Yazti, George Samaras, Panayiotis Andreou, Panos K. Chrysanthis
Issue Date:September 2007
pp. 13-18
This paper assumes a set of n mobile sensors that move in the Euclidean plane as a swarm. Our objectives are to explore a given geographic region by detecting and aggregating spatio-temporal events of interest and to store these events in the network until...
     
Efficient indexing data structures for flash-based sensor devices
Found in: ACM Transactions on Storage (TOS)
By Demetrios Zeinalipour-Yazti, Dimitrios Gunopulos, Song Lin, Vana Kalogeraki, Walid A. Najjar
Issue Date:November 2006
pp. 468-503
Flash memory is the most prevalent storage medium found on modern wireless sensor devices (WSDs). In this article we present two external memory index structures for the efficient retrieval of records stored on the local flash memory of a WSD. Our index st...
     
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