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SeaSTAR underwater experiments in Het Rutbeek lake 
The Dutch SeaSTAR project, which is funded by Technology Foundation STW, has reached a new milestone on May 6th 2013, when a network consisting of custom-built underwater sensor nodes was deployed and tested by the Pervasive Systems group of the University of Twente. In total, seven underwater nodes, were deployed in a lake at the Rutbeek recreational center near Enschede, The Netherlands. The goal of the test was to assess the feasibility of autonomous localization of the sensor nodes.

Autonomous localization of underwater sensor nodes is of great importance when such networks are used to monitor water quality, marine life behavior, oil spills, underwater pipeline integrity, and other underwater structures. Our tests show that autonomous localization is indeed possible.

The sensor nodes were developed in-house by the group with low-cost and flexibility in mind. Costs were kept down by using a COTS CPU board and standard PVC materials, whereas flexibility was achieved by implementing most features, such as the underwater MODEM and localization algorithms, in software.

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Bram Dil successfully defended his doctoral thesis  
On 25 April 2013, Bram Dil successfully defended his doctoral thesis entitled "Lost in space. Where the outer bound of localization space sets the lower bound on localization performance”. The research has been performed under supervision of Prof. Paul Havinga (promotor).
Thesis can be found at: http://eprints.eemcs.utwente.nl/23644/

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Colloquium on radio localization and sensing 
On Thursday 25 April 2013 starting from 14:30 at Waaier building of the University of Twente, PS will organize a colloquium on radio localization and sensing. In this unique opportunity, a number of pioneers in the field from Europe and USA will share their thoughts and ideas, and new sensing and localization systems and their possible applications will be discussed.

Radio localization is the process of finding the location through the use of radio waves. The most well-known and successful radio localization system is probably GPS. Many applications have emerged from GPS, like car navigation systems and support for supply chain management systems. However, GPS has its imitations. For example, it only provides robust positioning in outdoor environments and consumes a relatively large amount of energy.

The attendance to this colloquim is free of charge. Directions to the University of Twente in Enschede) can be found on http://www.utwente.nl/en/contact/route/.

More information about the speakers and the program can be found at: http://ps.cs.utwente.nl/Blog/RadioLocal ... posium.pdf

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PS at IDTechEx 2013 
PS particpated in the IDTechEx 2013 in Berlin, Germany with a number of demos, poster presentation, and two invited talks. During this two days event, PS showcased its research outcome related to wireless structural health monitoring and underwater sensor networks developed in the context of WiBrate and GENESI (for wireless structural health monitoring), as well as CLAM and SeaSTAR (for underwater sensor networks). Various contacts with research and industry were made and possible further collaborations were discussed.

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PS and Debate on Underwater Sensor Networks 
On 10 April 2013, Paul Havinga and Nirvana Meratnia were invited to participate in a debate session on future of underwater sensor networks. The debate was organized in the context of Sense of Contact congress taking place in Soesterberg, The Netherlands.

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