Change detection in images is of great interest due to its relevance in applications such as video surveillance. This paper presents the underlying theoretical problem of image change detection using wireless sensor n...
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ISBN:
(纸本)9783540730897
Change detection in images is of great interest due to its relevance in applications such as video surveillance. This paper presents the underlying theoretical problem of image change detection using wireless sensor network. The proposed system consists of multiple image sensors which make local decisions independently and send them to the base station which finally makes a global decision and declares whether a significant change has occurred or not.
sensor networks are often used to sense the physical world and provide observations for various uses. In hostile environments, it is critical to control the network access to ensure the integrity, availability, and at...
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ISBN:
(纸本)9783540730897
sensor networks are often used to sense the physical world and provide observations for various uses. In hostile environments, it is critical to control the network access to ensure the integrity, availability, and at times confidentiality of the sensor data. This paper develops efficient methods for distributed access control in sensor networks. The paper starts with a baseline approach, which provides a more flexible and efficient way to enforce access control when compared with previous solutions. This paper then extends the baseline approach to enable privilege delegation, which allows a user to delegate its privilege to other users without using a trusted server, and broadcast query, which allows a user to access the network at a large scale efficiently. The privilege delegation and broadcast query are very useful in practice;none of the current solutions can achieve these two properties.
Autonomous robotic wheelchairs are widely discussed in recent years. Most of autonomous robotic wheelchairs were developed based on rich computation architecture to deal with complicated navigation efforts such as per...
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ISBN:
(纸本)9781424409907
Autonomous robotic wheelchairs are widely discussed in recent years. Most of autonomous robotic wheelchairs were developed based on rich computation architecture to deal with complicated navigation efforts such as personal computers or embedded computers. However, such rich computation architectures increase cost of robotic wheelchair when compared to conventional powered wheelchairs. At the same time, large amounts of energy consumptions, lower reliability, and inefficient size of personal computers reduce the practicability of robotic wheelchair. In this paper, we present a low cost solution to solve complicated wheelchair navigation problem based on distributedcomputing architecture. This solution is developed based on the programmable System-on-Chip (PSoC) computing and control architecture. The tasks within autonomous navigations are categorized into human machine interface, sensor collection, fuzzy logic based navigation functions, dosed loop motion controller, and these tasks are individually implemented using the PSoC. Finally, the task oriented PSoC are integrated and fused to perform autonomous navigations of robotic wheelchairs. Consequently, the proposed PSoC based distributedcomputing architecture was successfully implemented and experimentally tested. The navigation results were verified using the results inferred from the personal computer based computing architecture.
Energy efficiency remains a critical design issue for wireless sensor networks. How to maintain the network connectivity and, at the same time, to minimize the energy consumption is a very challenging problem. Differe...
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ISBN:
(纸本)9780769529752
Energy efficiency remains a critical design issue for wireless sensor networks. How to maintain the network connectivity and, at the same time, to minimize the energy consumption is a very challenging problem. Different from many previous excellent results, we explore the topology control problem for heterogeneous wireless sensor networks. Our objective is to propose distributed topology control algorithms, where only local information is kept for all of the nodes. The experimental results show the strengths of the proposed algorithms in the average edge length and the average link length.
An important property in a sensor network is the monitoring of temporal changes of hazardous situations such as forest fires. Rescue groups need to be aware of dynamic changes that affect their rescue efforts. In this...
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ISBN:
(纸本)9780769529752
An important property in a sensor network is the monitoring of temporal changes of hazardous situations such as forest fires. Rescue groups need to be aware of dynamic changes that affect their rescue efforts. In this paper we discuss a sensor network model that provides a good abstraction of geometric and topological features of a dynamically changing sensing environment. This model enables efficient path planning and navigation using localized algorithms. We propose a dynamic medial axis model that represents shapes and changes of shapes in a geometric space. We develop distributed algorithms to capture the dynamic network topologies. Dynamic medial axis allows rescue teams to find a short path to safety in a changing environment. We show that our dynamic medial axis algorithms provide good approximations to the true medial axis and our routing scheme generates short and safe routes. The simulation results show that the routes found by our scheme are near-optimal.
A measure of machine intelligence facilitates comparing alternatives having different complexity. In this paper, a method for measuring the machine intelligence quotient (MIQ) of human-machine cooperative systems is a...
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ISBN:
(纸本)9781402062636
A measure of machine intelligence facilitates comparing alternatives having different complexity. In this paper, a method for measuring the machine intelligence quotient (MIQ) of human-machine cooperative systems is adapted and applied to measure the MIQ of an agent-based distributedsensor network system. Results comparing the MIQ of different agent-based scenarios are presented for the distributedsensor network application. The MIQ comparison is contrasted with the average sensor network field life, a key performance indicator, achieved with each scenario in Monte Carlo simulations.
Deployment of sensor networks in real-world settings is a labor-inten-sive and cumbersome task: environmental influences often trigger problems that are difficult to track down due to limited visibility of the network...
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ISBN:
(纸本)9783540730897
Deployment of sensor networks in real-world settings is a labor-inten-sive and cumbersome task: environmental influences often trigger problems that are difficult to track down due to limited visibility of the network state. In this paper we present a framework for passive inspection (i.e., no instrumentation of sensor nodes required) of deployed sensor networks and show how this framework can be used to inspect data gathering applications. The basic approach is to temporarily install a distributed network sniffer alongside the inspected sensor network, with overheard messages being analyzed by a data stream processor and network state being displayed in a graphical user interface. Our tool can be flexibly applied to different sensor network operating systems and protocol stacks, and can deal well with incomplete information.
In this paper, we consider how to localize individual nodes in a wireless sensor network when some subset of the network nodes can be in motion at any given time. For situations in which it is not practical or cost-ef...
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Because the knowledge of sensors' locations is very important to many location-based applications proposed for Wireless sensor Networks, many secure localization and location verification schemes have been propose...
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We propose and study a class of structured and dynamic information push and pull protocols for wireless sensor networks. For structured information dissemination, our study focuses on the impact of various information...
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ISBN:
(纸本)9783540730897
We propose and study a class of structured and dynamic information push and pull protocols for wireless sensor networks. For structured information dissemination, our study focuses on the impact of various information demand characteristics on dissemination along some type of backbone structures. Our exploration of dynamic information push and pull focuses on finding optimal strategies in a distributed manner without prior knowledge of information demand characteristics and/or with heterogeneous query distributions. Our theoretical analysis uses a simple grid structure, but the protocol is applicable to arbitrary network topologies. A distributed traffic information system is used as the context of study and the simulation study uses a microscopic traffic simulator to demonstrate some of the ideas discussed in the paper.
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