59 research outputs found
Deterministic boundary recongnition and topology extraction for large sensor networks
We present a new framework for the crucial challenge of
self-organization of a large sensor network. The basic scenario can
be described as follows: Given a large swarm of immobile sensor
nodes that have been scattered in a polygonal region, such as a
street network. Nodes have no knowledge of size or shape of the
environment or the position of other nodes. Moreover, they have no
way of measuring coordinates, geometric distances to other nodes, or
their direction. Their only way of interacting with other nodes is
to send or to receive messages from any node that is within
communication range. The objective is to develop algorithms and
protocols that allow self-organization of the swarm into large-scale
structures that reflect the structure of the street network, setting
the stage for global routing, tracking and guiding algorithms.
Our algorithms work in two stages: boundary recognition and topology
extraction. All steps are strictly deterministic, yield fast
distributed algorithms, and make no assumption on the distribution
of nodes in the environment, other than sufficient density
Shawn: A new approach to simulating wireless sensor networks
We consider the simulation of wireless sensor networks (WSN) using a new
approach. We present Shawn, an open-source discrete-event simulator that has
considerable differences to all other existing simulators. Shawn is very
powerful in simulating large scale networks with an abstract point of view. It
is, to the best of our knowledge, the first simulator to support generic
high-level algorithms as well as distributed protocols on exactly the same
underlying networks.Comment: 10 pages, 2 figures, 2 tables, Latex, to appear in Design, Analysis,
and Simulation of Distributed Systems 200
Spherical designs from norm-3 shell of integral lattices
A set of vectors all of which have a constant (non-zero) norm value in an
Euclidean lattice is called a shell of the lattice. Venkov classified strongly
perfect lattices of minimum 3 (R\'{e}seaux et "designs" sph\'{e}rique, 2001),
whose minimal shell is a spherical 5-design. This note considers the
classification of integral lattices whose shells of norm 3 are 5-designs.Comment: 10 pages, http://www2.math.kyushu-u.ac.jp/~j.shigezumi
A Survey on Facilities for Experimental Internet of Things Research
International audienceThe initial vision of the Internet of Things (IoT) was of a world in which all physical objects are tagged and uniquelly identified by RFID transponders. However, the concept has grown into multiple dimensions, encompassing sensor networks able to provide real-world intelligence and goal-oriented collaboration of distributed smart objects via local networks or global interconnections such as the Internet. Despite significant technological advances, difficulties associated with the evaluation of IoT solutions under realistic conditions, in real world experimental deployments still hamper their maturation and significant roll out. In this article we identify requirements for the next generation of the IoT experimental facilities. While providing a taxonomy, we also survey currently available research testbeds, identify existing gaps and suggest new directions based on experience from recent efforts in this field
SmartSantander: IoT experimentation over a smart city testbed
This paper describes the deployment and experimentation architecture of the Internet of Things experimentation facility being deployed at Santander city. The facility is implemented within the SmartSantander project, one of the projects of the Future Internet Research and Experimentation initiative of the European Commission and represents a unique in the world city-scale experimental research facility. Additionally, this facility supports typical applications and services of a smart city. Tangible results are expected to influence the definition and specification of Future Internet architecture design from viewpoints of Internet of Things and Internet of Services. The facility comprises a large number of Internet of Things devices deployed in several urban scenarios which will be federated into a single testbed. In this paper the deployment being carried out at the main location, namely Santander city, is described. Besides presenting the current deployment, in this article the main insights in terms of the architectural design of a large-scale IoT testbed are presented as well. Furthermore, solutions adopted for implementation of the different components addressing the required testbed functionalities are also sketched out. The IoT experimentation facility described in this paper is conceived to provide a suitable platform for large scale experimentation and evaluation of IoT concepts under real-life conditions.This work is funded by research project SmartSantander, under FP7-ICT-2009-5 of the 7th Framework Programme of the European Community. Authors would like to acknowledge the collaboration with the rest of partners within the consortium leading to the results presented in this paper
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