In wireless sensor networks (WSNs), QoS topology control achieves energy-efficiency by turning off redundant nodes and links, while still satisfying the given QoS requirement. However, existing topology control algori...
详细信息
ISBN:
(纸本)9781424425747
In wireless sensor networks (WSNs), QoS topology control achieves energy-efficiency by turning off redundant nodes and links, while still satisfying the given QoS requirement. However, existing topology control algorithms assume that links are either connected or disconnected. Recent experiments have shown that, besides the connected and disconnected region, a large percentage of links reside in the transitional region with fluctuating link qualities. In this paper, we propose both centralized and distributed solutions for QoS topology control, where we employ the opportunistic transmission to catch the best transmission opportunities on transitional links. Our simulations demonstrate that opportunistic transmission based approach can significantly improve energy-efficiency in QoS topology control with low communication overhead. A unique contribution of this paper is to consider link quality and apply opportunistic communication in topolog control for WSNs.
Monitoring human activities using wearable wireless sensor nodes has the potential to enable many useful applications for everyday situations. the deployment of a compact and computationally efficient grammatical repr...
详细信息
ISBN:
(纸本)9781424425747
Monitoring human activities using wearable wireless sensor nodes has the potential to enable many useful applications for everyday situations. the deployment of a compact and computationally efficient grammatical representation of actions reduces the complexities involved in the detection and recognition of human behaviors in a distributed system. In this paper, we introduce a road map to a linguistic framework for the symbolic representation of inertial information for physical movement monitoring. Our method for creating phonetic descriptions consists of constructing primitives across the network and assigning certain primitives to each movement. Our technique exploits the notion of a decision tree to identify atomic actions corresponding to every given movement. We pose an optimization problem for the fast identification of primitives. We then prove that this problem is NP-Complete and provide a fast greedy algorithm to approximate the solution. Finally, we demonstrate the effectiveness of our phonetic model on data collected from three subjects.
In this paper we present a platform for developing mobile, locative and collaborative distributed games comprised of small programmable object technologies (e.g., wireless sensor networks) and traditional networked pr...
详细信息
ISBN:
(纸本)9781424425747
In this paper we present a platform for developing mobile, locative and collaborative distributed games comprised of small programmable object technologies (e.g., wireless sensor networks) and traditional networked processors. the platform is implemented using a combination of JAVA Standard and Mobile editions, targeting also mobile phones that have some kind of sensors installed. We briefly present the architecture of our platform and demonstrate its capabilities by reporting two pervasive multiplayer games. the key characteristic of these games is that players interact with each other and their surrounding environment by moving, running and gesturing as a means to perform game related actions, using small programmable object technologies.
this paper describes initial research in addressing the challenges of managing quality of information for wireless sensor network target tracking with multiple missions of various priorities tracking multiple targets....
详细信息
ISBN:
(纸本)9781424425747
this paper describes initial research in addressing the challenges of managing quality of information for wireless sensor network target tracking with multiple missions of various priorities tracking multiple targets. We address the use of a distributed market-based mechanism to equalize the information value loss (that itself is a function of Quality of Information (QoI)) of tracked targets across multiple tracking missions while managing network congestion arising as a result of tracking. this includes considering missions' priorities and starvation of missions' data updates. In support of this approach, we define QoI as a function of the precision of position prediction of a tracked target and the loss of information value as the product of QoI and the priority of the mission tracking the target.
Underwater multimedia acoustic sensor networks will enable new underwater applications such as multimedia coastal and tactical surveillance, undersea explorations, picture and video acquisition and classification, and...
详细信息
ISBN:
(纸本)9781424425747
Underwater multimedia acoustic sensor networks will enable new underwater applications such as multimedia coastal and tactical surveillance, undersea explorations, picture and video acquisition and classification, and disaster prevention. Because of the different requirements of these applications, it is needed to provide efficient differentiated-service support to delay-sensitive and delay-tolerant data traffic as well as to loss-sensitive and loss-tolerant traffic. the objective of this paper is twofold: 1) explore the interactions of different underwater communication functionalities such as modulation, forward error correction, medium access control and routing, and 2) develop a distributed cross-layer solution integrating specialized communication functionalities that cooperate to allow multiple devices to efficiently and fairly share the bandwidth-limited high-delay underwater acoustic medium.
Withthe great progress of information technologies, computers are embedded into everywhere to make our daily life convenient, efficient and invisible. In order to utilize this progress for learning, a scheduler syste...
详细信息
ISBN:
(纸本)9780769534923
Withthe great progress of information technologies, computers are embedded into everywhere to make our daily life convenient, efficient and invisible. In order to utilize this progress for learning, a scheduler system, a Ubiquitous Learning system (ULS) was proposed. ULS contributes a lot to improve student's learning efficiency. Yet improvement can still be made to the system by using sensor networks. In our new design, we embed various kinds of sensors, like temperature sensor, oxygen sensor, light sensor, into the environment. Based on the information collected by such sensors, decisions can be made by the control center to adjust the environment automatically for learner. Our research result reveals that the improved ULS not only benefited learners to acquire their learning habits but also improve their learning efficiency.
Multiple target tracking within a monitored field usually focuses on tracking the trajectories of each individual target. However, it is incapable of identifying and locating each target when the amount of targets is ...
详细信息
ISBN:
(纸本)9781424425747
Multiple target tracking within a monitored field usually focuses on tracking the trajectories of each individual target. However, it is incapable of identifying and locating each target when the amount of targets is large or multiple targets are closely distributed Based on above consideration, this paper proposes a novel problem of tracking a group target, where a group target is a set of targets whose motions are correlated. A monitoring region covering all group members is proposed to represent the group target's location. And a report node is selected to collect sensor outputs for determining this monitoring region. Based on binary sensor network which is a generic model of sensor networks, we explore the fundamental limit of the accuracy of group target localization. Furthermore, to reduce network traffic, we propose two algorithms for estimating the center and radius of monitoring region. At last, we analyze the accuracy of these algorithms through boththeoretical analyses and simulation results.
distributed Real-time Embedded (DRE) systems are becoming increasingly common and important as the underlying technology for distributedcomputing and networking systems continues to develop. Efficient task scheduling...
详细信息
ISBN:
(纸本)9780769532875
distributed Real-time Embedded (DRE) systems are becoming increasingly common and important as the underlying technology for distributedcomputing and networking systems continues to develop. Efficient task scheduling is essential for achieving high performance in the application of embedded systems. However, because of its NP-hard nature, there are mainly heuristic algorithms in this area still needed to be improved. In this paper, a modified dynamic critical path algorithm is presented to find the earliest possible start time and the latest possible finish time of a task using the distributed nodes network structure. An algorithm called the Combined dynamic BLevel (CBL) has been presented to select the node-task mapping priorities based on the dynamic critical path. Using a novel DRE network model and a communication scheduling algorithm, tasks and associated information events are scheduled simultaneously withthe transfer time onto a node's communication link. According to the simulation results, the proposed solution outperforms existing mechanisms in terms of schedule length for communication intensive tasks.
this paper presents an integrated sink navigation and data routing framework called Network-Assisted Data Collection (NADC) in which optimum trajectories for a Mobile Data Harvester (MDH) are computed such that a desi...
详细信息
ISBN:
(纸本)9781424425747
this paper presents an integrated sink navigation and data routing framework called Network-Assisted Data Collection (NADC) in which optimum trajectories for a Mobile Data Harvester (MDH) are computed such that a desired balance between energy-efficiency and collection delay is achieved. We have formulated the problem of mobile sink based data collection using a configurable knob (k) to find the desired balance. the key concept is to appropriately adjust the data routing and mobile sink trajectory by varying parameter k the paper introduces a large slew of application scenarios withtheir unique optimization objectives, and demonstrates the relevance of the proposed framework in each such scenario. the notable solution components of NADC include a fully distributed and network assisted MDH navigation mechanism that does not rely on sensor localization services, and a multi-hop routing mechanism which works withthe underlying sink navigation so that the sensor data can be aggregated and uploaded through dynamically chosen gateway nodes located around the sink trajectory.
暂无评论