Self-protection in WSN (Wireless Sensor Networks) has not been deeply studied because WSN has a high rate of fails. The major concern in WSN is to maximize the network's Lifetime. In this work we propose and evalu...
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ISBN:
(纸本)9781424449378
Self-protection in WSN (Wireless Sensor Networks) has not been deeply studied because WSN has a high rate of fails. The major concern in WSN is to maximize the network's Lifetime. In this work we propose and evaluate a WSN architecture consisting of nodes grouped in cell arrays. Sensors located in arrays of directional antennas may apply strategies of self-configuration and some mechanisms to protect themselves. In this paper we present three strategies of self-protection using geometrical arrays of directional antennas and incremental RSSI measuments. These strategies are: i) changes in frequency;ii.) changes in the routing path;and Hi) increments of transmission range. We propose a general scenario to analyze different possible situations and their most important managed parameters. The results of our simulations show that our self-protection strategies and mechanism based on geometrical arrays of directional antennas are suitable for WSN.
Modern handheld devices provided with localization capabilities could be used to automatically create a diary of user's whereabouts, and use it as a complement of the user profile in many applications. In this pap...
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ISBN:
(纸本)9781595939845
Modern handheld devices provided with localization capabilities could be used to automatically create a diary of user's whereabouts, and use it as a complement of the user profile in many applications. In this paper we present the Whereabouts diary, an application/service to log the places visited by the user and to label them, in an automatic way, with descriptive semantic information. In particular, Web-retrieved data and the temporal patterns in which places are visited can be used to define such meaningful semantic labels. In this paper, we describe the general idea at the basis of our service and discuss our implementation and the associated experimental results. In addition, we illustrate an application that can fruitfully exploit the whereabouts diary as a supporting service, and discuss areas for future work.
This paper describes the state of the art of hopping robots for space exploration and new conceptual advances in algorithms for localization and sensing of hopping robots. We first review the state of the art of hoppi...
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This paper describes the state of the art of hopping robots for space exploration and new conceptual advances in algorithms for localization and sensing of hopping robots. We first review the state of the art of hopping robot systems and describe their characteristics with reference to past and current space missions. Then, we briefly summarize the operational principles of minimally actuated jumping robots that are suitable for exploring the unstructured terrain of celestial bodies. These principles are supported by the description of some of the key mechanisms implemented, and by laboratory tests. Then, a new localization algorithm for hopping localization that fuses camera, inertial and acceleration data to compute the most likely landing location of the robot is proposed. To support localization with geo-referenced measures, we also briefly propose a new stereo system, based on omnidirectional cameras, whose physical characteristics are well suited for a hopping robot. Computer simulations of the localization algorithm, together with preliminary geometrical analysis of the proposed stereo system, support our claims of their applicability to planetary exploration. Conclusions and plans for future development end the paper.
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