无线传感器网络的专刊

joycie

【文件名】:0698@52RD_cal phenomenon awareness using sensor networks.rar
【格　式】:rar
【大　小】:578K
【简　介】:A powerful concept to cope with resource limitations and information redundancy in wireless sensor networks is the use of collaboration groups to distill information within the network and suppress unnecessary activities. When the phenomena to be monitored have large geographical extents, it is not obvious how to define these collaboration groups. This article presents the application of geometric duality to form such
groups for sensor selection and non-local phenomena tracking. Using a dual-space transformation,which maps a non-local phenomenon (e.g., the edge of a half-plane shadow) to a single point in the dual space and maps locations of
distributed sensor nodes to a set of lines that partitions the dual space, one can turn off the majority of the sensors to achieve resource preservation without losing detection and tracking accuracy. Since the group so defined may consist of nodes that are far away in physical space, we propose a hierarchical architecture that uses a small number of computationally powerful nodes and a massive number of power constrained motes. By taking advantage of the continuity of physical phenomena and the duality principle, we can greatly reduce the power consumption in non-local phenomena tracking and extend the lifetime of the network.
【目　录】:无目录

joycie

【文件名】:0698@52RD_Designing Secure Sensor Networks.rar
【格　式】:rar
【大　小】:122K
【简　介】:Sensor networks are a promising approach for a variety of applications, such as monitoring safety and security of buildings and spaces, measuring traffic flows, and tracking environmental pollutants.Sensor networks will play an essential role in the upcoming age of pervasive computing, as our personal mobile devices will interact with sensor networks in our environment.

【目　录】:无目录

joycie

【文件名】:0698@52RD_ng with guaranteed delivery in sensor networks.rar
【格　式】:rar
【大　小】:182K
【简　介】:In a geocasting problem, a message is sent
from one node to all the nodes located in a designated
region. For example, a monitoring center
needs to contact all active sensors within a
monitored area to either gather data from them
periodically or provide its location to sensors
covering a certain area for event reporting. Intelligent
flooding methods exist for this task when
all active sensors belong to the monitored area.
However, when a particular area containing only
a small subset of active sensors needs to be monitored,
the problem reduces to geocasting. Most
existing geocasting solutions are shown not to
guarantee delivery. We describe three approaches
to guarantee delivery. Two of them are face
traversal schemes, based on depth-first search of
the face tree and traversal of all faces that intersect
the border of the geocasting region, respectively.
In the entrance zone multicasting-based
approach, the monitoring center divides the
entrance ring of a geocast region into zones of
diameter equal to the transmission radius. The
problem is decomposed into multicasting toward
the center of each zone, and flooding from these
nodes. Improvements to all methods can be
made by applying neighbor or area dominating
sets and coverage, and converting nodes that are
not selected to sleep mode. All solutions that
guarantee delivery are reported here for the first
time (except a message inefficient version of the
face tree traversal scheme).
【目　录】:无目录

joycie

【文件名】:0698@52RD_ess sensor networks by cross-layer interaction.rar
【格　式】:rar
【大　小】:190K
【简　介】:This article presents a cross-layered approach for networking in wireless sensor networks.WSNs differ greatly from traditional ad hoc wireless networks and therefore require the use of new types of network protocols that are energy-efficient to ensure a node lifetime of several years on a single battery and can operate without assistance of central managers in a dynamic
network topology. We show that a tightly integrated set of networking protocols is a good solution to reach the target of highly energy-efficient
WSNs. Our approach combines medium access organization with routing.
【目　录】:无目录

joycie

【文件名】:0698@52RD_echniques in wireless sensor networks a survey.rar
【格　式】:rar
【大　小】:293K
【简　介】:Wireless sensor networks consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing,power management, and data dissemination protocols have been specifically designed for WSNs where energy awareness is an essential design issue. Routing protocols in WSNs might differ depending on the application and network architecture.In this article we present a survey of state-of-the-art routing techniques in WSNs. We first outline the design challenges for routing
protocols in WSNs followed by a comprehensive survey of routing techniques. Overall, the routing techniques are classified into three categories based on the underlying networkstructure: flit, hierarchical, and location-based routing. Furthermore, these protocols can be classified into multipath-based, query-based,negotiation-based, QoS-based, and coherentbased depending on the protocol operation. We study the design trade-offs between energy and
communication overhead savings in every routing paradigm. We also highlight the advantages and performance issues of each routing technique.
The article concludes with possible future research areas.WSNs consist of
small nodes with sensing, computation,and wireless communications
capabilities. Many protocols have been specifically designed
【目　录】:无目录

joycie

【文件名】:0698@52RD_The design space of wireless sensor networks.rar
【格　式】:rar
【大　小】:139K
【简　介】:In the recent past, wireless sensor networks have found their way into a wide variety of applications and systems with vastly varying requirements and characteristics. As a consequence, it is becoming increasingly difficult to discuss typical requirements regarding hardware issues and software support. This is particularly problematic in a
multidisciplinary research area such as wireless sensor networks, where close collaboration between users, application domain experts, hardware
designers, and software developers is needed to implement efficient systems. In this article we discuss the consequences of this fact with regard
to the design space of wireless sensor networks by considering its various dimensions. We justify our view by demonstrating that specific existing applications occupy different points in the design space.
【目　录】:无目录

joycie

【文件名】:0698@52RD_ium access control in wireless sensor networks.rar
【格　式】:rar
【大　小】:225K
【简　介】:In this article we revisit the problem of scheduled access through a detailed foray into the questions of energy consumption and throughput for MAC protocols in wireless sensor networks.We consider a static network model that rules out simultaneous transmission and reception by any sensor node and consequently requires partitioning of nodes into disjoint sets of transmitters and receivers at any time instant. Under the assumption of circular transmission (reception) ranges with sharp boundaries, a greedy receiver activation heuristic is developed relying on the network connectivity map to determine distinct receiver groups to be activated within disjoint time intervals. To conserve limited energy resources in sensor networks, the time allocation to each receiver group is based on the residual battery energy available at the respective transmitters.Upon activating each receiver group separately,the additional time-division mechanism of Group TDMA is imposed to schedule transmissions interfering at the non-intended destinations within separate fractions of time in order to preserve the reliable feedback information. The two-layered time-division structure of receiver  activation and Group TDMA algorithms offers distributed and polynomial-time solutions (as required by autonomous sensor networks) to the problems of link scheduling as well as energy and throughput-efficient resource allocation in wireless access. The associated synchronization and overhead issues are not considered in this article.
【目　录】:无目录

joycie

【文件名】:0698@52RD_development with high system visibility.part1.rar
【格　式】:rar
【大　小】:900K
【简　介】:Recently, increasing research attention has been directed toward wireless sensor networks:collections of small low-power nodes, physically
situated in the environment, that can intelligently deliver high-level sensing results to the user.As the community has moved into more complex design efforts — large-scale, long-lived systems that truly require self-organization and adaptivity to the environment — a number of important software design issues have arisen. To make software robust, we must carefully observe
its behavior and understand its failure modes.However, many of these failures are not manifested until deployment time. Channel and storage limitations make visibility into a deployedsystem difficult, hindering our understanding of
failure modes. Simulation is difficult to apply;the network’s physical situatedness makes it sensitive to subtleties of sensors and wireless communication channels that are difficult to model.In this article we describe EmStar, a PC-based software framework that aims to make development
easier by improving system visibility.EmStar’s novel execution environments encompass pure simulation, true in-situ deployment,and hybrid modes that combine simulation with real wireless communication and sensors situated
in the environment.
【目　录】:无目录

joycie

【文件名】:0698@52RD_development with high system visibility.part2.rar
【格　式】:rar
【大　小】:900K
【简　介】:
【目　录】:

joycie

【文件名】:0698@52RD_development with high system visibility.part3.rar
【格　式】:rar
【大　小】:565K
【简　介】:
【目　录】: