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In this paper we present methods to reach 10-years of battery life for Industrial Internet of Things (IIoT) wireless sensor network (WSN) using a platform called the I3Mote. I3Mote provides connected sensor nodes for tough industrial environment and a number of I3Motes can form a large-scale coverage of data collectors or actuators. The goal is to achieve 10-years network life time for all the connected...
Data-race-free (DRF) parallel programming becomes a standard as newly adopted memory models of mainstream programming languages such as C++ or Java impose data-race-freedom as a requirement. We propose compiler techniques that automatically delineate extended data-race-free regions (xDRF), namely regions of code which provide the same guarantees as the synchronization-free regions (in the context...
Wireless Sensor Networks (WSN) is a field which has gained much importance in the past decade. WSN contain sensor nodes which are battery powered and hence reducing energy consumption is the most challenging issue in such systems. One important method to reduce energy consumption in WSN is to do cross layer optimization. This paper gives a PHY-MAC cross layer design which reduces the energy consumption...
We propose a clean-slate, holistic approach to the design of secure protocols for wireless ad-hoc networks. We design a protocol that enables a collection of distributed nodes to emerge from a primordial birth and form a functioning network. We consider the case when nodes are synchronized and the network is closed, in that no other nodes can join. We define a game between protocols and adversarial...
A PCE-based strategy for LSP re-optimization in flexgrid optical networks is experimentally validated. A front- and back-end stateful PCE architecture is deployed, wherein automatic and coordinated operations (e.g., computation delegation, database synchronization, etc.) are demonstrated using PCEP and BGP-LS protocols.
This paper proposes Clock-RSM, a new state machine replication protocol that uses loosely synchronized physical clocks to totally order commands for geo-replicated services. Clock-RSM assumes realistic non-uniform latencies among replicas located at different data centers. It provides low-latency linearizable replication by overlapping 1) logging a command at a majority of replicas, 2) determining...
The performance of I/O operations on HPC systems is a bottleneck in many parallel applications. The MPI Forum defined the MPI-IO programming interface for parallel I/O as part of the MPI-2 standard. With MPIIO, parallel applications can overcome the performance and portability limitations of existing parallel I/O interfaces. MPIIO performance analysis and tuning are important for parallel software...
The symmetry of packet delay is one of basic assumption of PTP (Precision Time Protocol). But most existing networks could not meet this assumption to achieve high accuracy PTP synchronization. The FIFO block is one of main reasons that lead packet delay asymmetry according to the research. So the packet delay estimation with minimum FIFO block is put forward to try to select those “lucky packets”...
Many scientific applications operate in a bulk-synchronous mode of iterative communication and computation steps. Even though the communication steps happen at the same logical time, important patterns such as stencil computations cannot be expressed as collective communications in MPI. We demonstrate how neighborhood collective operations allow to specify arbitrary collective communication relations...
In recent years, the FlexRay communication protocol been promoted as a de facto standard for in-vehicular communication. In the FlexRay protocol, the communication timeline is organized as a sequence of four segments, whereas the static segment defines a set of slots specifically designed for the transmission of synchronous messages. In this paper, we investigate the following problem: “how to allocate...
In this paper, a direct mapping synthesis method for asynchronous sequential controllers from a state graph model is presented. This Method targets Quasi Delay Insensitive (QDI) controllers and shows a drastic enhancement in circuit performances compared to the standard HDL-based synthesis. Firstly, the modeling issues are discussed. Secondly, the direct mapping algorithms are presented. The sequence...
Large-scale actuator control problems in Cyber-Physical Systems (CPSs) are often expressed within the networked optimization model. While significant advances have taken place in optimization techniques, their widespread adoption in practical implementations is impeded by the complexity of inter-node coordination and lack of programming support that is necessary for sharing information coherently...
Time synchronization is one of the fundamental techniques for the wireless sensor networks to obtain the real-time effective information. The security of this technology is becoming increasingly important. In this paper, we analyze the security of RBS, the synchronization algorithm in WSN, point out the potential vulnerabilities existing in the algorithm, and propose optimization on security for the...
P2P-based optimization has recently gained interest among distributed function optimization scientists. Several well-known optimization heuristics have been recently re-designed to exploit the peculiarity of such a distributed environment. The final goal is to perform high quality function optimization by means of inexpensive, fully decentralized machines, which may either be purposely organized in...
The prevalence of the small-world phenomenon in numerous efficient networks, such as social networks, Internet, nervous systems, implies that small-worlds are an evolutionary solution for locally growing networks. These networks require short communication distances between their nodes in spite of their potentially large network diameter but at the same time are robust against randomly occurring failures...
This paper addresses the optimization of parallel simulators for large-scale parallel systems and applications. Such simulators are often based on parallel discrete event simulation with conservative or optimistic protocols to synchronize the simulating processes. The paper considers how available future information about events and application behaviors can be efficiently extracted and further exploited...
The time synchronization, as one primary technology for distributed networks, is necessary to cooperative measure, data fused and target location. With the development of wireless sensor networks, the applications require that the precision of time synchronization is more and more accurate. In this paper, Ant Colony Optimization (ACO) is used to improve the performance of time synchronization based...
Concurrent RWA algorithm for differentiated services to process multiple LSP bundles at PCE is proposed. Significant blocking probability reduction has been observed at the expense of slightly increased LSP setup-time compared to a sequential approach.
The performance of applications is influenced by the way its operations are grouped into global transactions. This in turn influences the performance of business processes which utilize these applications as implementations of process activities/steps. Stratified transactions, as produced by the stratification approach presented in this paper, is a way to manage a global transaction by combining the...
Energy efficiency is a primordial issue in the wireless sensor networks. This is achieved by deactivating nodes when possible. In this paper we describe the MAC protocol MaCARI that synchronizes nodes in order to schedule active and inactive periods. MaCARI divides time into three periods: a synchronization period, a scheduled activities period where communications are constrained by a tree and an...
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