Browsing Τμήμα Πληροφορικής / Department of Computer Science by Author "Zeinalipour-Yazdi, Constantinos D."

Article

Distributed middleware architectures for scalable media services

Kalogeraki, Vana; Zeinalipour-Yazdi, Constantinos D.; Gunopulos, Dimitrios; Delis, Alexis (2007)

The fusion of Multimedia and Internet technology has introduced an ever-increasing demand for large-scale reliable media services. This exposes the scalability limitations of current middleware architectures, as they ...

Article

A distributed middleware infrastructure for personalized services

Dikaiakos, Marios D.; Zeinalipour-Yazdi, Constantinos D. (2004)

In this paper, we present an overview of extensible Retrieval, Annotation and Caching Engine (eRACE), a modular and distributed intermediary infrastructure that collects information from heterogeneous Internet sources ...

Conference Object

Distributed spatio-temporal similarity search

Zeinalipour-Yazdi, Constantinos D.; Lin, S.; Gunopulos, Dimitrios (2006)

In this paper we introduce the distributed spatio-temporal similarity search problem: given a query trajectory Q, we want to find the trajectories that follow a motion similar to Q, when each of the target trajectories is ...

Book

DMSN '10: Proceedings of the Seventh International Workshop on Data Management for Sensor Networks

Zeinalipour-Yazdi, Constantinos D.; Association for, Computing Machinery

Conference Object

Efficient exploration of telco big data with compression and decaying

Costa, Constantinos; Chatzimilioudis, Georgios; Zeinalipour-Yazdi, Constantinos D.; Mokbel, M. F. (IEEE Computer Society, 2017)

In the realm of smart cities, telecommunication companies (telcos) are expected to play a protagonistic role as these can capture a variety of natural phenomena on an ongoing basis, e.g., traffic in a city, mobility patterns ...

Article

Efficient indexing data structures for flash-based sensor devices

Lin, S.; Zeinalipour-Yazdi, Constantinos D.; Kalogeraki, Vana; Gunopulos, Dimitrios; Najjar, W. A. (2006)

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 ...

Conference Object

Efficient online state tracking using sensor networks

Halkidi, Maria; Kalogeraki, Vana; Gunopulos, Dimitrios; Papadopoulos, Dimitris; Zeinalipour-Yazdi, Constantinos D.; Vlachos, Michail (2006)

Sensor networks are being deployed for tracking events of interest in many environmental or monitoring applications. Because of their distributed nature of operation, a challenging issue is how to accurately identify the ...

Conference Object

ETC: Energy-driven tree construction in wireless sensor networks

Andreou, Panayiotis G.; Pamboris, Andreas; Zeinalipour-Yazdi, Constantinos D.; Chrysanthis, Panos K.; Samaras, George S. (2009)

Continuous queries in Wireless Sensor Networks (WSNs) are founded on the premise of Query Routing Tree structures (denoted as T), which provide sensors with a path to the querying node. Predominant data acquisition systems ...

Article

Exploiting locality for scalable information retrieval in peer-to-peer networks

Zeinalipour-Yazdi, Constantinos D.; Kalogeraki, Vana; Gunopulos, Dimitrios (2005)

An important problem in unstructured peer-to-peer (P2P) networks is the efficient content-based retrieval of documents shared by other peers. However, existing searching mechanisms are not scaling well because they are ...

Conference Object

FailRank: Towards a unified GRID failure monitoring and ranking system

Zeinalipour-Yazdi, Constantinos D.; Neocleous, Kyriacos; Georgiou, Chryssis; Dikaiakos, Marios D. (2008)

The objective of Grid computing is to make processing power as accessible and easy to use as electricity and water. The last decade has seen an unprecedented growth in Grid infrastructures which nowadays enables large-scale ...

Article

Finding the K highest-ranked answers in a distributed network

Zeinalipour-Yazdi, Constantinos D.; Vagena, Zografoula; Kalogeraki, Vana; Gunopulos, Dimitrios; Tsotras, Vassilis J.; Vlachos, Michail; Koudas, Nick; Srivastava, D. (2009)

In this paper, we present an algorithm for finding the k highest-ranked (or Top-k) answers in a distributed network. A Top-K query returns the subset of most relevant answers, in place of all answers, for two reasons: (i) ...

Article

FireWatch: G.I.S.-assisted wireless sensor networks for forest fires

Andreou, Panayiotis G.; Constantinou, George; Zeinalipour-Yazdi, Constantinos D.; Samaras, George S. (2012)

Traditional satellite and camera-based systems, are currently the predominant methods for detecting forest fires. Our study has identified that these systems lack immediacy as detected fires must gain some momentum before ...

Conference Object

FSort: External sorting on flash-based sensor devices

Andreou, Panayiotis G.; Spanos, O.; Zeinalipour-Yazdi, Constantinos D.; Samaras, George S.; Chrysanthis, Panos K. (2009)

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 ...

Conference Object

Human Mobility Computing and Privacy: Fad or Reality?

Lee, A. J.; Pelechrinis, K.; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2015)

The advent of mobile computing and sensing technologies, in conjunction with omni-present and high-speed mobile networks, allow nowadays the capture of human mobility data at an extremely high fidelity. Modern mobile ...

Conference Object

ICGrid: Enabling intensive care medical research on the EGEE grid

Gjermundrød, H.; Dikaiakos, Marios D.; Zeinalipour-Yazdi, Constantinos D.; Panayi, G.; Kyprianou, T. (2007)

Healthcare Information Systems are nowadays among the world's largest, fastest-growing and most information intensive industries. Additionally, Intensive Care Units are widely considered as the most technologically advanced ...

Conference Object

Identifying failures in grids through monitoring and ranking

Zeinalipour-Yazdi, Constantinos D.; Neocleous, Kyriacos; Georgiou, Chryssis; Dikaiakos, Marios D. (2008)

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 ...

Conference Object

IEEE ICDM 2010 Contest: TomTom Traffic prediction for intelligent GPS Navigation

Wojnarski, M.; Gora, P.; Szczuka, M.; Nguyen, H. S.; Swietlicka, J.; Zeinalipour-Yazdi, Constantinos D. (2010)

In this foreword, we summarize the IEEE ICDM 2010 Contest: "

Article

In-network data acquisition and replication in mobile sensor networks

Andreou, Panayiotis G.; Zeinalipour-Yazdi, Constantinos D.; Chrysanthis, Panos K.; Samaras, George S. (2011)

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 spatiooral events of interest and to store these ...

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

Information retrieval techniques for peer-to-peer networks

Zeinalipour-Yazdi, Constantinos D.; Kalogeraki, Vana; Gunopulos, Dimitrios (2004)

An important challenge in peer-to-peer (P2P) networks is to efficiently search the contents of other peers. The authors survey existing search techniques for information retrieval in P2P networks, including recent techniques ...