While deployment and practical on-site testing remains the ultimate touchstone for sensor network code, good simulation tools can help curtail in-field troubleshooting time. Unfortunately, current simulators are succe...
详细信息
ISBN:
(数字)9783540691709
ISBN:
(纸本)9783540691693
While deployment and practical on-site testing remains the ultimate touchstone for sensor network code, good simulation tools can help curtail in-field troubleshooting time. Unfortunately, current simulators are successful only at evaluating system performance and exposing manifestations of errors. they are not designed to diagnose the root cause of the exposed anomalous behavior. this paper presents a diagnostic simulator, implemented as an extension to TOSSIM [6]. It (i) allows the user to ask questions such as "why is (some specific) bad behavior occurring?", and (ii) conjectures on possible causes of the user-specified behavior when it is encountered during simulation. the simulator works by logging event sequences and states produced in a regular simulation run. It then uses sequence extraction, and frequent pattern analysis techniques to recognize sequences and states that are possible root causes of the user-defined undesirable behavior. To evaluate the effectiveness of the tool, we have implemented the directed diffusion protocol and used our tool during the development process. During this process the tool was able to uncover two design bugs that were not addressed in the original protocol. the manifestation of these two bugs were same but the causes of failure were completely different - one was triggered by node reboot and the other was triggered by an overflow of timestamps generated by the local clock. the case study demonstrates a success scenario for diagnostic simulation.
the proceedings contain 45 papers. the topics discussed include: directional controlled fusion in wireless sensor networks;routing optimization in wireless mesh networks under uncertain traffic demands;delay-constrain...
ISBN:
(纸本)9789639799264
the proceedings contain 45 papers. the topics discussed include: directional controlled fusion in wireless sensor networks;routing optimization in wireless mesh networks under uncertain traffic demands;delay-constraint topology control in wireless sensor networks format;exploiting time and user diversity in distributed medium access control for mobile ad-hoc networks;DTN based dominating set routing technique for mobile ad hoc networks;a mechanism of automated monitoring deployment in grid environment;efficient data gathering in partially connected and delay-tolerant wireless sensor networks;mitigating energy holes based on transmission range adjustment in wireless sensor networks;leveraging spatial reuse with adaptive carrier sensing in 802.11 wireless networks;measuring web feature impacts in BitTorrent-like systems;and end-to-edge QoS across heterogeneous wireless and wired domains.
sensor networks have been used in many surveillance, providing statistical information about monitored. Accurate counting information (e.g., the distribution the total number of targets) is often important for making....
详细信息
Space environment is an indispensable part of the earth environment, but the extreme space weather can bring disasters to human life. the simulation and prediction of complex space environment system using high perfor...
详细信息
ISBN:
(纸本)9780769530994
Space environment is an indispensable part of the earth environment, but the extreme space weather can bring disasters to human life. the simulation and prediction of complex space environment system using high performance computer is a promising way to solve the problem. Hardware platform is not adequate, a robust software platform is necessary in that it can deal withthe complexity of simulation, reduce the cost, and finally avoid software crisis. the Center for Space Environment Modeling (CSEM at the University of Michigan has developed the SWMF (Space Weather Modeling Framework), but it still has some limitations on interoperation of models, reuse of legacy codes, code maintenance, and distributedcomputing. this paper presents a new space environment system modeling framework, DHPA (distributed High Performance Architecture for Space Environment Modeling and Simulation). Adopting CCA(Common Component Architecture) specifications, newly proposed by a consortium of university and national laboratory researchers to introduce software engineering into large-scale scientific computing field, combining service-oriented design ideas, DHPA may be a solution to the problems existed in SWMf, and thus provide scientists with a virtual platform to conduct the collaborative working on physical modeling, model integration, code reuse, management, and visualization, and to realize prediction for space weather.
At present, the OSs (Operating system) employed for WSN (wireless sensor networks) are either satisfied with only one or two application classes or unsuitable for strict-constrained resources. In view of a variety of ...
详细信息
ISBN:
(纸本)9780769532875
At present, the OSs (Operating system) employed for WSN (wireless sensor networks) are either satisfied with only one or two application classes or unsuitable for strict-constrained resources. In view of a variety of WSN applications, there is a need of developing a self-adaptable and self-configurable embedded real-time operating system (RTOS). this paper presents a resource-aware and low-power RTOS termed LIMOS. this kernel adopts a component-based three-level system architecture: action (system operation), thread (component) and event (container). In accordance, a predictable and deterministic two-level scheduling mechanism is proposed: 'non pre-emption priority based' high level scheduling for events and 'preemptive priority-based' low level scheduling for threads. Employing the concepts of LINDA language, LIMOS provides a simplified tuple space and alight IN/OUT system primitive pair to achieve system communication and synchronization. LIMOS is capable of self-adapting to run on two operation modes: event-driven and multi-threading, with respect to the application diversity. the performance evaluation and comparison shows LIMOS has tiny resource consumption and is fit for the real-time applications. Currently LIMOS has been ported on several hardware platforms for different WSN applications.
Withthe emerging embedding of the sensor networks into the pervasive environment, our capabilities on location information gathering and processing have been greatly improved. Although this information is very useful...
详细信息
ISBN:
(纸本)9780769534923
Withthe emerging embedding of the sensor networks into the pervasive environment, our capabilities on location information gathering and processing have been greatly improved. Although this information is very useful, it also brings great challenges for protecting the privacy. Currently, most research efforts focus oil protecting current location, and ignore the internal relationship among the successive locations. To date, there are many techniques to infer a location when the related successive information is published, and which bring in serious privacy and security concerns. In this paper, we Jar the first time consider this kind of relationship, and identify a novel successive privacy threat. We then formulate a generic model for protecting the successive privacy. Under this model, there is a trade-off between the number of data to be published and the privacy protecting level, and which brings a novel maximum publishable location privacy problem. As this problem is intractable, we develop several heuristics. Extensive simulations demonstrate the effectiveness of our schemes.
In this poster, we propose a positioning method for networked sensor nodes that Include mobile ones. Using the non-parametric belief propagation (NBP), the proposed method estimates the location of each node based on ...
详细信息
ISBN:
(纸本)9784907764319
In this poster, we propose a positioning method for networked sensor nodes that Include mobile ones. Using the non-parametric belief propagation (NBP), the proposed method estimates the location of each node based on the measurements of the relative distances to neighbors. Simulation results showed that the NBP based method improved the estimated positions and removed ambiguity of positions.
We propose a localization algorithm that tries to improve the Monte Carlo technique for mobile sensor networks by merging different alternatives into the original Monte Carlo algorithm. Our objective is to reduce some...
详细信息
ISBN:
(纸本)9784907764319
We propose a localization algorithm that tries to improve the Monte Carlo technique for mobile sensor networks by merging different alternatives into the original Monte Carlo algorithm. Our objective is to reduce some of its existing liabilities, while guaranteeing a better accuracy, faster localization convergence, and controlled communication overhead.
Underwater sensor Networks (USNs) could provide real time in-situ monitoring to supply high spatiotemporal resolution capability. However underwater environment represents many challenges for sensor networks. It has b...
详细信息
It is very important to maximize the lifetime of Wireless sensor Networks (WSN) operated on limited power. In order to improve the energy efficiency and prolong the network lifetime, a new clustering algorithm based o...
详细信息
ISBN:
(纸本)9780769532875
It is very important to maximize the lifetime of Wireless sensor Networks (WSN) operated on limited power. In order to improve the energy efficiency and prolong the network lifetime, a new clustering algorithm based on the optimum one-hop distance is presented. the relationship among the energy consumption, the device electronic energy and the one-hop transmission distance is analyzed, and then the inverse ratio of the energy consumption increment to the cube of the optimal one-hop distance is gained. So, the clustering algorithm based on the optimal one-hop distance is given to reduce energy consumption. All sensor nodes are divided into different static clusters based on the optimum one-hop distance, and the distance between the fore-and-aft adjacent duster heads equals or approximates to the optimum one-hop distance, which reduces the energy consumption for inter-cluster communication. At the same time, cluster head acts continuously as local control center and will not be replaced by the candidate cluster head until it almost exhausts its energy supply, which can lessen energy consumption for establishing the new cluster head. Finally, the simulation results demonstrate that the algorithm achieves good effect to prolonging the system lifetime.
暂无评论