@conference{waharte_secon09, author = "Sonia Waharte and Niki Trigoni and Simon J. Julier", booktitle = "Sixth Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks (SECON)", title = "Coordinated Search with a Swarm of UAVs", year = "2009", } @inproceedings{atsn09, author = "Ettore Ferranti and Niki Trigoni", booktitle = "Workshop on Agent Technology for Sensor Networks (ATSN), a workshop of the International Joint Conference on Autonomous Agents and Multi-Agent Systems (AAMAS)", title = "The Impact of Localization Errors on the Performance of the Ants Exploration Algorithm", year = "2009", } @article{, author = "E. Ferranti, N. Trigoni and M. Levene", journal = "Journal of Autonomous Agents and Multi-Agent Systems", title = "Rapid Exploration of Unknown Areas Through Dynamic Deployment of Mobile and Stationary Sensor Nodes", year = "2009", } @techreport{RR-09-02, abstract = "Abstract: When an emergency occurs within a building, it is safer to send autonomous mobile agents instead of human responders, to explore the area and identify hazards and victims. Existing exploration algorithms [1], [2] allow mobile agents to make distributed navigation decisions by communicating with nearby fixed sensors embedded in the environment. These algorithms are very efficient in terms of exploration time, but they have only been evaluated in simulation environments, where idealized assumptions were made regarding the ability of agents to localize sensors and move accurately towards them. The objective of this work is to investigate practical issues of building a real testbed of mobile agents and fixed sensors, and implementing exploration algorithms in such a testbed. In particular, we describe our experiences from building a real system consisting of a Surveyor SRV-1 robot and Tmote Sky sensors running the Contiki OS [3]. We select two existing exploration algorithms, Ants [1] and Brick&Mortar [2], and discuss challenges in trying to implement them in our testbed. To address these challenges, we propose practical solutions that allow a mobile agent to: (i) identify and localize fixed sensors deployed in its vicinity; and (ii) accurately move towards a carefully selected fixed sensor. Using our real network deployment, we derive realistic models of localization and odometry errors. We then insert these error models into a realistic simulation environment, in order to extensively compare Ants and Brick&Mortar, and measure their performance degradation as a result of introducing realistic errors.", author = "Ettore Ferranti and Niki Trigoni", institution = "OUCL", number = "RR-09-02", pages = "9", title = "Practical Issues in Deploying Mobile Agents to Explore a Sensor-Instrumented Environment", year = "2009", } @inproceedings{twinroute, abstract = "Collecting data from source sensor nodes to designated sinks is a common and challenging task in a wide spectrum of sensor network applications, ranging from animal monitoring to security surveillance. A number of approaches exploiting sink mobility have been proposed in recent years: some are proactive, in that sensor nodes push their readings to storage nodes from where they are collected by roaming mobile sinks, whereas others are reactive, in that mobile sinks pull readings from nearby sensor nodes as they traverse the sensor network. In this paper, we point out that deciding which data collection approach is more energy-efficient depends on application characteristics, including the mobility patterns of sinks and the desired freshness of collected data. We illustrate cases where combining proactive and reactive modes of data collection is particularly beneficial. This motivates the design of TwinRoute, a novel hybrid algorithm that can flexibly mix the two collection modes at appropriate levels depending on the application scenario. Our extensive experimental evaluation, using synthetic and real-world network topologies and sink traces, shows that TwinRoute outperforms the pure approaches, achieving desirable tradeoffs between energy expenditure and timely delivery of sensor data.", author = "Ricklef Wohlers, Niki Trigoni, Rui Zhang and Stephen Ellwood", booktitle = "Proceedings of the 10th International Conference on Mobile Data Management: Systems, Services and Middleware (MDM)", month = "May", title = "TwinRoute: Energy-Efficient Data Collection in Fixed Sensor Networks with Mobile Sinks", year = "2009", } @inproceedings{, author = "A. Skordylis and N. Trigoni", booktitle = "24th Annual ACM Symposium on Applied Computing (ACM SAC'09)", journal = "24th Annual ACM Symposium on Applied Computing (ACM SAC'09)", month = "March", title = "Jointly Optimizing Data Acquisition and Delivery in Traffic Monitoring VANETs", year = "2009", } @inproceedings{IROS2008, author = "E. Ferranti, N. Trigoni and M. Levene", booktitle = "IEEE/RSJ 2008 International Conference on Intelligent RObots and Systems (IROS)", journal = "IEEE/RSJ 2008 International Conference on Intelligent RObots and Systems, 22-26 September 2007, Nice, France", location = "Nice, France", month = "September", title = "HybridExploration: a Distributed Approach to Terrain Exploration using Mobile and Fixed Sensor Nodes", year = "2008", } @conference{ferranti08robot, author = "Ettore Ferranti and Niki Trigoni", booktitle = "ICRA08, IEEE International Conference on Robotics and Automation", journal = "ICRA08, IEEE International Conference on Robotics and Automation 19-23 May 2008, Pasadena, CA, USA", location = "Pasadena, CA, USA", month = "May", publisher = "IEEE", title = "Robot-Assisted Discovery of Evacuation Routes in Emergency Scenarios", year = "2008", } @inproceedings{dcoss08, author = "Alexandre Guitton, Niki Trigoni and Sven Helmer", booktitle = "IEEE International Conference on Distributed Computing in Sensor Systems (DCOSS)", pages = "190-203", title = "Fault-Tolerant Compression Algorithms for Delay Sensitive Sensor Networks with Unreliable Links", year = "2008", } @inproceedings{key6, author = "Jean Bacon, Alastair Beresford, David Evans, David Ingram, Niki Trigoni, Alexandre Guitton, Antonios Skordylis", booktitle = "IEEE CCNC, Fifth IEEE Consumer Communications & Networking Conference", journal = "IEEE CCNC, Fifth IEEE Consumer Communications & Networking Conference", title = "TIME: An open platform for capturing, processing and delivering transport-related data.", year = "2008", } @inproceedings{key4, author = "Niki Trigoni, Alexandre Guitton and Antonios Skordylis", booktitle = "ICDCN 2008, 9th International Conference on Distributed Computing and Networking", journal = "ICDCN 2008, 9th International Conference on Distributed Computing and Networking", title = "Interplay of processing and routing in aggregate query optimization for sensor networks.", year = "2008", } @inproceedings{mobihoc08, author = "Antonios Skordylis, Niki Trigoni", booktitle = "ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc)", journal = "ACM MobiHoc", title = "Delay-bounded Routing in Vehicular Ad-hoc Networks", year = "2008", } @inproceedings{mobisensors07, author = "Silvia Nittel, Niki Trigoni and Neal Pettigrew", booktitle = "NSF Workshop on Data Management for Mobile Sensor Networks (MobiSensors)", title = "Data Management in Mobile Ad-Hoc Ocean Sensor Networks", year = "2007", } @proceedings{mobide07, author = "Silvia Nittel, Niki Trigoni, Konstantinos Ferentinos, Francois Neville, Arda Nural and Neal Pettigrew", journal = "ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE), in conj. with SIGMOD/PODS", title = "A Drift-Tolerant Model for Data Management in Ocean Sensor Networks", year = "2007", } Warning - the bibtex entry below may be invalid: Missing 'booktitle' field @inproceedings{cesn07, author = "Arda Nural, Silvia Nittel, Niki Trigoni and Neal Pettigrew", journal = "Conference on Coastal Environmental Sensing Networks (CESN)", title = "A Model for Motion Pattern Discovery in Ocean Drifter Networks", year = "2007", } @conference{ferranti07brick, author = "Ettore Ferranti, Niki Trigoni and Mark Levene", booktitle = "ICRA07, IEEE International Conference on Robotics and Automation", journal = "IEEE International Conference on Robotics and Automation 10-14 April 2007, Roma, Italy", location = "Roma, Italy", month = "April", publisher = "IEEE", title = "Brick&Mortar: An On-Line Multi-Agent Exploration Algorithm", year = "2007", } @article{tosn07, author = "Niki Trigoni, Yong Yao, Alan Demers, Johannes Gehrke and Rajmohan Rajaraman", journal = "ACM Transactions on Sensor Networks", month = "March", title = "Wave Scheduling and Routing in Sensor Networks", volume = "3:1", year = "2007", } @inproceedings{key7, author = "Alexandre Guitton, Antonios Skordylis, and Niki Trigoni", booktitle = "WCNC 2007, IEEE Wireless Communications & Networking Conference", journal = "WCNC 2007, IEEE Wireless Communications & Networking Conference", title = "Utilizing Correlations to Compress Time-Series in Traffic Monitoring Sensor Networks.", year = "2007", } @book{key2, author = "Niki Trigoni, Alexandre Guitton, and Antonios Skordylis", booktitle = "Learning from Data Streams: Processing Techniques in Sensor Networks", chapter = "6", editor = "Joao Gama and Mohamed Medhat Gaber", month = "November", publisher = "Springer", title = "Learning from Data Streams: Processing Techniques in Sensor Networks. Chapter 6: Querying of Sensor Data", year = "2007", } @inproceedings{key5, author = "Niki Trigoni, Alexandre Guitton, and Antonios Skordylis", booktitle = "ACM SenSys 2006, The 4th ACM Conference on Embedded Networked Sensor Systems", title = "Poster Abstract: Routing and Processing Multiple Aggregate Queries in Sensor Networks", year = "2006", } @inproceedings{key3, author = "Antonios Skordylis, Alexandre Guitton, and Niki Trigoni", booktitle = "CoNext 2006, 2nd Conference on Future Networking Technologies", title = "Correlation-Based Data Dissemination in Traffic Monitoring Sensor Networks", year = "2006", } @inproceedings{key1, author = "Antonios Skordylis, Niki Trigoni, and Alexandre Guitton", booktitle = "WISES'06, Fourth International Workshop on Intelligent Solutions in Embedded Systems", title = "A Study of Approximate Data Management Techniques for Sensor Networks", year = "2006", } @inproceedings{dcoss05, author = "Niki Trigoni, Yong Yao, Alan Demers, Johannes Gehrke and Rajmohan Rajaraman", booktitle = "IEEE/ACM International Conference on Distributed Computing in Sensor Systems (DCOSS)", title = "Multi-Query Optimization for Sensor Networks", year = "2005", } @inbook{book04, author = "Alan Demers, Johannes Gehrke, Rajmohan Rajaraman, Niki Trigoni and Yong Yao.", editor = "B.K. Szymanski and B. Yener", journal = "Chapter in book: Advances in Pervasive Computing and Networking", pages = "179-197", publisher = "Springer", title = "Directions in Multi-Query Optimization for Sensor Networks", year = "2004", } @inproceedings{dmsn04, author = "Niki Trigoni, Yong Yao, Alan Demers, Johannes Gehrke and Rajmohan Rajaraman", booktitle = "ACM Workshop on Data Management for Sensor Networks (DMSN), in conjuction with VLDB", title = "WaveScheduling: Energy-Efficient Data Dissemination for Sensor Networks", year = "2004", } @inproceedings{wsn04, author = "Niki Trigoni, Yong Yao, Alan Demers, Johannes Gehrke and Rajmohan Rajaraman", booktitle = "GI Workshop on Sensor Networks (WSN)", title = "Hybrid Push-Pull Query Processing for Sensor Networks", year = "2004", } @inproceedings{unywsn03, author = "Alan Demers, Johannes Gehrke, Rajmohan Rajaraman, Niki Trigoni and Yong Yao", booktitle = "2nd IEEE Upstate New York Workshop on Sensor Networks", title = "Energy-Efficient Data Management for Sensor Networks: A Work-In-Progress Report", year = "2003", } @article{sigmodRecord03, author = "Alan Demers, Johannes Gehrke, Rajmohan Rajaraman, Niki Trigoni and Yong Yao.", journal = "ACM SIGMOD Record", month = "December", number = "4", title = "The Cougar Project: A Work-In-Progress Report", volume = "34", year = "2003", } @inproceedings{fqas02, author = "Niki Trigoni", booktitle = "International Conference on Flexible Query Answering Systems (FQAS)", title = "Interactive Query Formulation in Semistructured Databases", year = "2002", } Warning - the bibtex entry below may be invalid: Missing 'school' field @phdthesis{thesis01, author = "Niki Trigoni", institution = "University of Cambridge, Computer Laboratory", title = "Semantic optimization of OQL queries", year = "2001", } @inproceedings{bncod01, author = "Niki Trigoni and Gavin Bierman", booktitle = "18th British National Conference on Databases (BNCOD)", title = "Inferring the Principal Type and the Schema Requirements of an OQL Query", year = "2001", } @inproceedings{ssdbm01, author = "Niki Trigoni and Ken Moody", booktitle = "International Conference on Scientific and Statistical Database Management (SSDBM)", title = "Using Association Rules to Add or Eliminate Query Constraints Automatically", year = "2001", } @techreport{oqlReport00, author = "Gavin Bierman and Niki Trigoni", institution = "University of Cambridge, Computer Laboratory", month = "October", number = "TR 497", title = "Towards a Formal Type System for ODMG OQL", year = "2000", } Warning - the bibtex entry below may be invalid: Missing 'author' field Missing 'title' field Missing 'booktitle' field Missing 'year' field @inproceedings{, }