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DCS: Distributed Asynchronous Clock Synchronization in Delay Tolerant Networks

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In this paper, we propose a distributed asynchronous clock synchronization (DCS) protocol for Delay Tolerant Networks (DTNs). Different from existing clock synchronization protocols, the proposed DCS protocol can achieve global clock synchronization among mobile nodes within the network over asynchronous and intermittent connections with long delays. Convergence of the clock values can be reached by […]

Capacity of Data Collection in Arbitrary Wireless Sensor Networks

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Data collection is a fundamental function provided by wireless sensor networks. How to efficiently collect sensing data from all sensor nodes is critical to the performance of sensor networks. In this paper, we aim to understand the theoretical limits of data collection in a TDMA-based sensor network in terms of possible and achievable maximum capacity. […]

Cloud Computing Security: From Single to Multi-Clouds

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The use of cloud computing has increased rapidly in many organizations. Cloud computing provides many benefits in terms of low cost and accessibility of data. Ensuring the security of cloud computing is a major factor in the cloud computing environment, as users often store sensitive information with cloud storage providers but these providers may be […]

Soft-TDMAC: A Software-Based 802.11 Overlay TDMA MAC with Microsecond Synchronization

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We implement a new software-based multihop TDMA MAC protocol (Soft-TDMAC) with microsecond synchronization using a novel system interface for development of 802.11 overlay TDMA MAC protocols (SySI-MAC). SySI-MAC provides a kernel independent message-based interface for scheduling transmissions and sending and receiving 802.11 packets. The key feature of SySI-MAC is that it provides near deterministic timers […]

AMPLE: an adaptive traffic engineering system based on virtual routing topologies

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Handling traffic dynamics in order to avoid network congestion and subsequent service disruptions is one of the key tasks performed by contemporary network management systems. Given the simple but rigid routing and forwarding functionalities in IP base environments, efficient resource management and control solutions against dynamic traffic conditions is still yet to be obtained. In […]

On Achieving Group-Strategy proof Multicast

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In computer networks, multicast models a class of data dissemination applications, where a common data item is routed to multiple receivers simultaneously. The routing of multicast flows across the network may incur a cost, and such a cost is to be recovered from payments by receivers who enjoy the multicast service. In reality, a group […]

Revealing Density-Based Clustering Structure from the Core-Connected Tree of a Network

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Clustering is an important technique for mining the intrinsic community structures in networks. The density-based network clustering method is able to not only detect communities of arbitrary size and shape, but also identify hubs and outliers. However, it requires manual parameter specification to define clusters, and is sensitive to the parameter of density threshold which […]

Using Dependency Structures for Prioritisation of Functional Test Suites

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Test case prioritisation is the process of ordering the execution of test cases to achieve a certain goal, such as increasing the rate of fault detection. Increasing the rate of fault detection can provide earlier feedback to system developers, improving fault fixing activity and ultimately software delivery. Many existing test case prioritisation techniques consider that […]

Iterative Trust and Reputation Management Using Belief Propagation

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In this paper, we introduce the first application of the belief propagation algorithm in the design and evaluation of trust and reputation management systems. We approach the reputation management problem as an inference problem and describe it as computing marginal likelihood distributions from complicated global functions of many variables. However, we observe that computing the […]

Secure Distance-Based Localization in the Presence of Cheating Beacon Nodes

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Secure distance-based localization in the presence of cheating beacon (or anchor) nodes is an important problem in mobile wireless ad hoc and sensor networks. Despite significant research efforts in this direction, some fundamental questions still remain unaddressed: In the presence of cheating beacon nodes, what are the necessary and sufficient conditions to guarantee a bounded […]