the technology of parallel 10 is one of the key technologies for high performance computer. Firstly, the 10 system of the newest Top500 typical machines will be introduced in this paper. Secondly, a new distributed sh...
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ISBN:
(纸本)9780769530994
the technology of parallel 10 is one of the key technologies for high performance computer. Firstly, the 10 system of the newest Top500 typical machines will be introduced in this paper. Secondly, a new distributed shared parallel 10 system for high performance computer (DSPIO) will be put forward, and some key technologies implemented in the system 14411 be discussed Finally, a prototype system is built. the experiment results show that this architecture can offer high 10 bandwidth, good scalability, and suit for high performance computing very much.
In the recent years, wireless sensor networks have attracted a lot of attention due to their broad application areas. In many application scenarios, hundreds or thousands of sensor nodes may be deployed in the physica...
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A wave is a distributed computation, often made up of a broadcast phase followed by a feedback phase, requiring the participation of all the processes in a network before a particular event called decision is taken. S...
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A wave is a distributed computation, often made up of a broadcast phase followed by a feedback phase, requiring the participation of all the processes in a network before a particular event called decision is taken. Solutions to a large number of fundamental problems in distributedcomputing requires waves. in this paper, we propose a time optimal snap-stabilizing wave algorithm implementing Propagation of Information with Feedback (PIF) for arbitrary synchronous networks with O(d) rounds of delay and O(logd) bits per process, where d is the diameter of the communication network. A system is said to be snap-stabilizing if it always behaves according to its specification [A. Bui, A. Datta, F. Petit, V. Villain, State-optimal snap-stabilizing PIF in tree networks, in: Proceedings of the third Workshop on Self-stabilizing systems (published in association with ICDCS99 the 19thieeeinternationalconference on distributedcomputingsystems), ieee Computer Society, Washington, DC, USA, vol. 5, 1999, pp. 78-85]. One of the main advantages of the proposed algorithm being snap-stabilizing is that the arbitrary initial configuration has limited or no effect on the pace of the broadcast propagation. (C) 2008 Elsevier B.V. All rights reserved.
We propose a light-weight and scalable broadcast authentication scheme, Curtain, for sensor network. Instead of using Merkel tree to combine multiple mu TESLA instance, we apply compressed Bloom filters to multiple mu...
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ISBN:
(数字)9783540691709
ISBN:
(纸本)9783540691693
We propose a light-weight and scalable broadcast authentication scheme, Curtain, for sensor network. Instead of using Merkel tree to combine multiple mu TESLA instance, we apply compressed Bloom filters to multiple mu TESLA. Our scheme can support longer duration and prolong the self-healing property. We greatly reduce the communication overhead at the cost of allocating a moderate space in each receiver. Combing with PKC computation like ECC, our scheme can guarantee the long-term security and also mitigate energy consumption. Moreover, our methods can be extend to the situation of multiple senders, offering efficient user addition and revocation.
this paper presents an energy-aware, sleep scheduling algorithm called SSMTT to support multiple target tracking sensor networks. SSMTT leverages the awakening result of interfering targets to save the energy consumpt...
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ISBN:
(数字)9783540691709
ISBN:
(纸本)9783540691693
this paper presents an energy-aware, sleep scheduling algorithm called SSMTT to support multiple target tracking sensor networks. SSMTT leverages the awakening result of interfering targets to save the energy consumption on proactive wake-up communication. For the alarm message-miss problem introduced by multiple target tracking, we present a solution that involves scheduling the sensor nodes' sleep pattern. We compare SSMTT against three sleep scheduling algorithms for single target tracking: the legacy circle scheme, MCTA, and TDSS. Our experimental evaluations show that SSMTT achieves better energy efficiency than handling multiple targets separately through single target tracking algorithms.
sensor networks are now enabling the monitoring of various environmental phenomena with more accuracy than the previous labour intensive and less technological solutions. this paper is concerned withthe application o...
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ISBN:
(纸本)9781424425747
sensor networks are now enabling the monitoring of various environmental phenomena with more accuracy than the previous labour intensive and less technological solutions. this paper is concerned withthe application of opportunistic networking techniques to wildlife monitoring, where the sensors are attached to animals moving in their habitat. We present Seal-2-Seal, a novel protocol for logging of node (i.e., animal) contacts in mobile networks and for dissemination of that information to sinks for further analysis. the protocol utilises an efficient data summary mechanism to reduce the amount of information that needs to be transmitted, thus reducing energy consumption. To evaluate the performance of the protocol, we implemented it for the Contiki operating system on sensor devices and ran simulations based on real-life mobility traces using the Cooja emulator
Focusing on the assessment of environmental noise pollution in urban areas, we provide qualitative considerations and experimental results to show the feasibility of wireless sensor networks to be used in this context...
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ISBN:
(数字)9783540691709
ISBN:
(纸本)9783540691693
Focusing on the assessment of environmental noise pollution in urban areas, we provide qualitative considerations and experimental results to show the feasibility of wireless sensor networks to be used in this context. To select the most suitable data collection protocol for the specific noise monitoring application scenario, we evaluated the energy consumption performances of the CTP (Collection Tree Protocol) and DMAC protocols. Our results show that CTP, if used enabling the LPL (Low Power Listening) option, provides the better performances trade-off for noise monitoring applications.
We introduce a self-organizing stochastic-communications scheme, called BSTeR, for wireless adhoc/sensor networks (mobile or stationary). the introduced scheme involves three ideas essentially: 1) Each node i determin...
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ISBN:
(纸本)9781424425747
We introduce a self-organizing stochastic-communications scheme, called BSTeR, for wireless adhoc/sensor networks (mobile or stationary). the introduced scheme involves three ideas essentially: 1) Each node i determines its transmit power dynamically according to a random variable P-i;2) Node i computes the Probability Mass Function (PMF) of P-i, based on the topology of the network and the PMFs of other nodes in the network dynamically;and 3) Each time node i needs to transmit a data packet, it generates a random number pi(i) according to P-i, and transmits the data with power level pi(i). Compared to the widely employed fixed-power communication schemes, the introduced scheme provides significant performance gains over many performance aspects concurrently, including network connectivity, end-to-end power/energy consumption, end-to-end delay and throughput, energy-delay relation, system longevity, and coverage.
In this paper we examine the Quality of Information (QoI) at the output of a real wireless sensor network by considering the difference between the monitored environment and the interpreted data produced by the networ...
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ISBN:
(纸本)9781424425747
In this paper we examine the Quality of Information (QoI) at the output of a real wireless sensor network by considering the difference between the monitored environment and the interpreted data produced by the network. Using practical examples in an experimental setting, we hope to shed light on the concept of QoI and on the manner of estimating and evaluating it. We use a real wireless network in combination with simulated events, to help us formulate and understand the concept of QoI and its associated technical questions. Using algorithms such as trilateration and clustering to interpret the outputs of the sensor network, we explore several definitions of QoI, including the peak signal to noise ratio. Furthermore we investigate the impact that different packet transmission approaches have on the QoI. We show that QoI is time-varying, and that in-network processing allows QoI levels to be maintained while reducing network load.
Since the penetration of photovoltaic (PV) systems in the Low Voltage (LV) distribution network is increasing, the need to register and model the contribution of these systems to the harmonic distortion of current and...
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ISBN:
(纸本)9781424417438
Since the penetration of photovoltaic (PV) systems in the Low Voltage (LV) distribution network is increasing, the need to register and model the contribution of these systems to the harmonic distortion of current and voltage waveforms is becoming an up-to-date issue. As PV systems incorporate power conditioning units, which are harmonic generating devices, they will have an influence on quality of supply, reliable operation of system equipment as well as component life expectancy. this paper investigates the harmonic impact of a 20 kWp PV system connected to the LV distribution network in Greece. the harmonic behavior of the PV plant as a function of the solar radiation under several weather conditions is analyzed. Measurements results are compared to those obtained from the power simulator package PSIM (c). the level of penetration of PV systems in the LV distribution network without harmonic limits been exceeded is investigated.
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