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Parallelization of big-data analytics services over a federation of heterogeneous clouds has been considered to improve performance. However, contrary to common intuition, there is an inherent tradeoff between the level of parallelism and the performance for big-data analytics principally because of a significant delay for big-data to get transferred over the network. The data transfer delay can be...
Particle swarm optimization (PSO) algorithm is a population-based algorithm for finding the optimal solution. Because of its simplicity and high efficiency, PSO is gaining attention in solving complex and large scale problems. However, PSO often requires long execution time to solve those problems. This paper proposes a parallel PSO algorithm, called delayed exchange parallelization, which improves...
In this paper, the exponential synchronization problem of a class of chaotic delayed neural networks (DNNs) via impulsive control method is studied. Based on the theory of impulsive functional differential equations (FDEs), some new synchronization criteria expressed in the form of linear matrix inequalities (LMIs) are derived. The designed impulsive controller not only can globally exponentially...
This paper proposes a method aiding in low clock skew applicable to the mainstream industry clock tree synthesis (CTS) design flow. The original clock root is partitioned into several pseudo clock sources at the gate level. The automatic place and route (APR) tool may synthesize the clock tree with better performance in clock skew because each pseudo clock source drives smaller number of fan out....
Bluetooth is emerging as an important standard for short range, low-power low cost wireless communication radio technology. Recently, the specification operating in an unlicensed frequency band of 2.4 GHz that describes how mobile phones, computers and personal digital assistants (PDA) can be easily and fast interconnected using a short range wireless connection. The devices discovery and connection...
This paper considers the controlled synchronization of delayed weighted complex dynamical network consisting of heterogeneous nodes. By adding controllers to nodes of the second kind in the model presented consisting of two kinds of nodes, both delay-independent and delay-dependent stability criteria for the controlled synchronization state of the network are derived. It is shown that the stability...
Consistency and responsiveness are two important factors in providing the sense of reality in Distributed Virtual Environment (DVE). However, it is not easy to optimize both aspects because of the trade-off between these two factors. As a result, most existing consistency maintenance methods ignored the responsiveness requirements, or just assumed a simple responsiveness requirement model which cannot...
This letter considers the problem of mean-square exponential synchronization control for a class of stochastic delayed neural networks. Different from the prior works, the master-response synchronization setup under consideration transmits its signals through unreliable links, which include network-induced delays, frame losses, and random fluctuations. We firstly introduce a mathematical model of...
The subject area of this paper is discrete-time linear time-invariant systems composed of subsystems whose state updating is asynchronous due to the clock signal arriving with delays. This leads to the synchronization error identification problem which is to find from a trajectory of the system the order in which the subsystems' states are updated. A solution to this problem based on a direct search...
We propose a new method that accelerates existing Byzantine Fault Tolerance (BFT) protocols for asynchronous distributed systems by parallelizing the involved consensuses. BFT realizes a reliable system against Byzantine failures and is usually solved by repeatedly executing consensus for a set of requests. Our method consistently parallelizes the consensus by introducing a new extra consensus on...
In this paper, the asymptotic stability of the pinning synchronous solution of stochastic neural networks with time delays is analyzed. The delays are time-invariant, and the uncertainties are norm bounded that enter into all the parameters of network and control. The aim of this paper is not only to establish easily verifiable conditions under which the pinning synchronous solution of stochastic...
Diagnosability is a crucial property that determines at design stage how accurate any diagnosis algorithm can be on a partially observable system. Recent work on diagnosability has generalized fault event case to pattern case, which can describe more general objectives for diagnosis problem, but based on global model and global twin plant construction. In this paper, we propose an original framework...
This paper proposes a ZSCTS methodology aiding in zero skew clock tree synthesis suitable to the mainstream industry clock tree synthesis (CTS) design flow. At the gate level, the original clock net is broken up into smaller partitions, and the clock buffers are inserted as pseudo clock sources to drive each portion. The automatic place and route (APR) tool may synthesize each clock subtree with better...
In mobile ad hoc networks (MANETs), time synchronization can be achieved by distributing time information among nodes. This type of time synchronization, however, does not work well under considerable long delay caused by sparse population. In this paper, we propose a simple yet effective scheme for relative time synchronization. When two mobile nodes meet, they exchange their clock information and...
An increasing demand for applications in the area of Ultra-Wideband Radio Technology led to the EUWB (Coexisting Short Range Radio by Advanced Ultra-Wideband Radio Technology, FP7-ICT-215669, www.euwb.eu) project, which has been started in April 2008. The goal of this industry-led initiative of major industrial and excellent academic organizations is the improvement, integration, and the applications...
We analyze global synchronization of oscillator networks with inhibitory delayed and non-delayed pulse coupling. For a fully-coupled system without delays, we propose simple modifications to the state-of-the-art. We prove that the resulting system converges to full in-phase synchronization of all oscillators from arbitrary initial conditions. For systems with arbitrarily distributed delays we propose...
With advances in energy harvesting techniques, it is now feasible to build sustainable sensor networks (SSN) to support long-term applications. Unlike battery-powered sensor networks, the objective of sustainable sensor networks is to effectively utilize a continuous stream of ambient energy. Instead of pushing the limits of energy conservation, we are aiming at energy-synchronized designs1 to keep...
We consider asynchronous point-to-point communication. Building on a recently developed model, we show that training based schemes, i.e., communication strategies that separate synchronization from information transmission, perform suboptimally at high rate.
The outage behavior of amplify-and-forward (AF) relaying protocol over an asynchronous cooperative network is examined when orthogonal frequency division multiplexing (OFDM) is used to combat synchronization error among the transmitting nodes. We consider non-orthogonal AF (NAF) and orthogonal1 AF (OAF) protocols, respectively, over a single relay and a two relay cooperative network and analyze the...
In this paper specific variants of delay attacks are examined. First, the Network Time Protocol is regarded. Second, delay attacks and implications on the time synchronization of the Precise Time Protocol are described. In particular, consequences for the offset calculation Oprox are regarded. At the end of the paper possible countermeasurements are described.
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