| 1. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Analyzing different levels of geographic context awareness in agent ferrying over VANETs
- 2011
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Ingår i: Proceedings of the 2011 ACM Symposium on Applied Computing. - New York : ACM Press. - 9781450301138 ; , s. 413-418
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Konferensbidrag (refereegranskat)abstract
- The use of mobile software agents is a promising approach to implement services over ad hoc networks. This paper presents an analysis of mobile autonomous agents with different degrees of intelligence that allow them to make usage of the positioning information of vehicle carried sensor nodes with different depth of complexity, considering the nodes’ current and future locations. The agents’ intelligence is used to decide their movement during opportunistic connections among the nodes in order to accomplish missions. In this work, the analysis is done over an application of “virtual sensors”, implemented by services provided by the mobile agents. These agents run on top of an infrastructure-less Vehicular Ad hoc Network (VANET). Simulation results are presented and discussed to support the proposed ideas.
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| 2. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Coordination Mechanism and Customizable Hardware Platform to Provide Heterogeneous Wireless Sensor Networks Support
- 2010
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Konferensbidrag (refereegranskat)abstract
- This paper presents an effort to support emerging Wireless Sensor Networks applications composed by different types of sensor nodes. The work is composed by two parts, in which the first is dedicated to provide cooperation abilities to sensor nodes, while the second is a customizable hardware platform intended to provide different types of sensor nodes, from those more resource constrained up to the resource-rich ones. A description of a testbed demonstra- tor of the proposed system is provided and comparisons with previous published simulation results denote the feasibility of the proposal.
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| 3. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Decentralized task distribution among cooperative UAVs in surveillance systems applications
- 2010
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Ingår i: 2010 Seventh International Conference on Wireless On-demand Network Systems and Services. - New York : IEEE Press. - 9781424460595 ; , s. 121-128
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Konferensbidrag (refereegranskat)abstract
- Teams of small Unmanned Aerial Vehicles (UAVs) are being largely proposed to be used in different areas for both military and civilian applications. Their integration in wider sensor networks is also being considered in order to provide a better cost-benefit ration. However, coordination among UAV teams is not a trivial problem in an ad hoc network. This paper presents a decentralized coordination strategy to orient the actions of a team of UAVs, which take part in a wider sensor network, relying on ad hoc network communication. The proposed sensors network inclused static sensors that issue alarms indicating the presence of possible targets that must be handled by one of the UAVs and possibly relay messages among them. Preliminary results of the proposed approach are presented and are contrasted with results provided by a centralized solution for the problem.
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| 4. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Enhanced Wireless Sensor Network Setup Strategy Supported by Intelligent Software Agents
- 2010
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Ingår i: Sensors 2010 Hawaii. - Piscataway, N.J. : IEEE Press. - 9781424481682 ; , s. 813-816
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Konferensbidrag (refereegranskat)abstract
- A well know problem in the Wireless Sensor Network (WSN) research area is the usage of appropriate strategies to setup the sensor nodes such that they may accomplish sensing missions. This problem refers to the selection of appropriate nodes to perform the different tasks required to the missions' accomplishment and may be thus characterized as an instance of the task and resource allocation problem. Traditional approaches consider pre-planned strategies, which are not flexible to deal with changes in the network and environment operating conditions. This paper presents an enhanced agent-oriented strategy, which consists of a usage of mobile intelligent agents to disseminate missions and nodes' information over the network, as well as stationary software agents installed in the sensor nodes to provide advanced reasoning apparatus for decision making purposes. The proposed enhancement complements the original agent-based approach with robustness features required to overcome extreme adverse conditions in which an ordinary WSN presents poor results. Results from simulations provide evidences of the efficiency of the complete enhanced approach.
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| 5. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Experimental Analysis of Coordination Strategies to Support Wireless Sensor Networks Composed by Static Ground Sensors and UAV-Carried Sensors
- 2010
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Ingår i: International Symposium on Parallel and Distributed Processing with Applications, ISPA 2010. - New York : IEEE Press. - 9780769541907 ; , s. 152-161
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Konferensbidrag (refereegranskat)abstract
- This paper presents a comparison among different strategies to coordinate the use of heterogeneous wireless sensors aimed for area surveillance. The heterogeneity among the sensor nodes is related to their sensing and mobility capabilities. The goal of the strategies is to provide coordination among the different nodes, in order to make the wireless sensor network perform its missions with higher efficiency. Strategies combine advantages of bio-inspired and utility-based approaches to coordination. Simulations of scenarios with different characteristics were performed and the results are compared and analyzed.
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| 6. |
- de Freitas, Edison Pignaton, et al.
(författare)
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Pheromone-based coordination strategy to static sensors on the ground and unmanned aerial vehicles carried sensors
- 2010
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Ingår i: Ground-Air multi-sensor interoperability, integration, and networking for persistent ISR. - Bellingham : SPIE - International Society for Optical Engineering. - 9780819481580 ; , s. Article number 769416-
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Konferensbidrag (refereegranskat)abstract
- A current trend that is gaining strength in the wireless sensor network area is the use of heterogeneous sensor nodes in one coordinated overall network, needed to fulfill the requirements of sophisticated emerging applications, such as area surveillance systems. One of the main concerns when developing such sensor networks is how to provide coordination among the heterogeneous nodes, in order to enable them to efficiently respond the user needs. This study presents an investigation of strategies to coordinate a set of static sensor nodes on the ground cooperating with wirelessly connected Unmanned Aerial Vehicles (UAVs) carrying a variety of sensors, in order to provide efficient surveillance over an area of interest. The sensor nodes on the ground are set to issue alarms on the occurrence of a given event of interest, e.g. entrance of a non-authorized vehicle in the area, while the UAVs receive the issued alarms and have to decide which of them is the most suitable to handle the issued alarm. A bio-inspired coordination strategy based on the concept of pheromones is presented. As a complement of this strategy, a utility-based decision making approach is proposed.
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| 7. |
- de Freitas, Edison Pignaton, et al.
(författare)
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UAV relay network to support WSN connectivity
- 2010
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Ingår i: 2010 International Congress on Ultra Modern Telecommunications and Control Systems and Workshops. - Piscataway, N.J. : IEEE Press. - 9781424472857 ; , s. 309-314
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Konferensbidrag (refereegranskat)abstract
- An important problem in Wireless Sensor Networks (WSN) is the occurrence of failures that lead to the disconnection of parts of the network, compromising the final results achieved by the WSN operation. A way to overcome such problem is to provide a reliable connection to support the connectivity via other types of nodes that communicate with the sensor nodes. This paper proposes the usage of a network composed by Unmanned Aerial Vehicles (UAVs) as a relay network to guarantee the delivery of data produced by WSN nodes on the ground to the users. Results from simulations of the proposed technique are provided and discussed.
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| 8. |
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| 9. |
- Heimfarth, Tales, et al.
(författare)
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Experimental Analysis of a Wireless Sensor Network Setup Strategy Provided by an Agent-Oriented Middleware
- 2011
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Ingår i: Advanced Information Networking and Applications (AINA), 2010 24th IEEE International Conference on. - Los Alamitos, Calif. : IEEE Computer Society. - 9781424466955 - 9780769540184 ; , s. 820-826
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Konferensbidrag (refereegranskat)abstract
- This paper presents simulation results of a setup strategy for wireless sensor networks, based on an agent-oriented middleware. A great problem that has to be tackled in sensor networks is how to setup them to provide the data required from the user with a minimal overhead. Having this goal in mind, the proposed approach abstracts the network setup as missions, which are handled within the network by intelligent agents that disseminate and divide the work related to the missions. Several experiments using this approach are provided, showing its efficiency and the low overhead that it imposes to the network.
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| 10. |
- Heimfarth, Tales, et al.
(författare)
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Middleware Support for Wireless Sensor Networks : A survey
- 2010
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Ingår i: Handbook of Research on Developments and Trends in Wireless Sensor Networks. - Hershey, PA : Information Science Reference. - 9781615207015 - 1615207015 - 9781615207022 ; , s. 235-260
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Bokkapitel (refereegranskat)abstract
- Wireless sensor networks (WSNs) are gaining visibility due to several sophisticated applications in which they play a key role, such as in pervasive computing and context-aware systems. However, the evolution of WSN capabilities, especially regarding their ability to provide information, brings complexity to their development, in particular for those application developers that are not familiar with the technology underlying and needed to support WSNs. In order to address this issue and allow the use of the full potential of the sensor network capabilities, the use of a middleware that raises the abstraction level and hides much of the WSN complexity is a promising proposal. However, the development of a middleware for WSNs is not an easy task. Systems based on WSNs have several issues that make them quite different from conventional networked computer systems, thus requiring specific approaches that largely differ from the current solutions. The proposal of this chapter is to address the complexity of middleware made for sensor networks, presenting a taxonomy that characterizes the main issues in the field. An overview of the state-of-the-art is also provided, as well as a critical assessment of existing approaches. © 2010, IGI Global.
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