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A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless networked control systems (NCSs) are investigated to provide an abstraction of the wireless network for a co-design approach. We first present an analytical...
We study how the choice of packet scheduling algorithms influences end-to-end performance on long network paths. Taking a network calculus approach, we consider both deterministic and statistical performance metrics. A key enabling contribution for our analysis is a significantly sharpened method for computing a statistical bound for the service given to a flow by the network as a whole. For a suitably...
In order to optimize pedestrian signal cycle, queuing theory and probability theory were used to build delay model of pedestrian-vehicle system, and then put forward the calculation method of conversion coefficient of pedestrian crowd and vehicles. The delays of pedestrian and vehicle were calculated by equilibrium phase delay formula. The critical volume curves of pedestrian signal for pedestrian...
We propose a method based on partial least squares (PLS) regression to estimate the probability density function of the critical path delay. The method works on a reduced problem facilitated by PLS regression and requires only 102 samples to achieve satisfactory accuracy. The method is verified by simulations on ISCAS'85 benchmark circuits.
Geographic routing is a scalable routing scheme for wireless networks, where nodes make local routing decisions using position information. Cooperative transmissions utilize spatial diversity to combat fading in wireless channels. In this paper, we incorporate cooperative transmissions into geographic routing, and propose the Location-Aware Cooperative Routing (LACR). In LACR, a node that receives...
Devices in a mobile ad-hoc environment can follow different movement patterns based on the application environment. Some environments, such as mass transit systems, follow regular and predictable patterns. Others, such as an aerial monitoring network, generally follow random paths. Optimal routing schemes tend to take advantage of information regarding movement patterns available in social interaction...
A 2D Markov-Chain analysis is used to model channel occupancy within a high mobility picocell based network including handover and outage events. Single-cell performance is evaluated by the Grade of Service and by the call dropping probability. The relations between different picocellular network parameters are analyzed and guidelines for proper MAC protocol design are given.
In underwater scenario, algorithms that assume constant velocity model are suitable for tracking non maneuvering targets but fail if target is maneuvering. The Interacting Multiple Model algorithm is a widely accepted state estimation scheme for solving maneuvering target tracking problems. This paper presents the IMM method of tracking under water maneuvering targets using active sonar measurements...
End-to-end QoS is a challenge for future Internet. A per flow resource reservation can be carried out among heterogeneous domains on the communication path using signaling protocols. When one or both communicating terminals are mobile there is additional complexity. Signaling delays and resource lacking on future paths can dramatically impact user experience. In this paper, a rational future path...
In the classical version of the Bayesian quickest change detection problem proposed by Shiryaev in the nineteen sixties, there is a sequence of observations whose distribution changes at a random time, and the goal is to minimize the average detection delay, subject to a constraint on the probability of false alarm. We consider this quickest change detection problem with an additional constraint on...
This paper presents a method to compute criticality probabilities of paths in parameterized statistical static timing analysis (SSTA). We partition the set of all the paths into several groups and formulate the path criticality into a joint probability of inequalities. Before evaluating the joint probability directly, we simplify the inequalities through algebraic elimination, handling topological...
Quality of Service (QoS) of video streaming service over wireless and mobile network is determined by many intermingled factors. Some of the factors can be adjusted. Video resolution, audio rate, and bandwidth are among of them. Other factors are not fully controllable such as network throughput, delay, and packet lost probability. In order to increase user satisfaction, efforts to make better quality...
Modern logic synthesis systems apply a sequence of loosely-related function-preserving transformations to gradually improve the circuit with respect to certain criteria such as area, performance, power, etc. For the quality of a complete synthesis run, the application order of the transformations for the individual steps are critical as they can produce vastly different outcomes. In practice, the...
In recent years, in distributed cooperative systems such as distributed file systems and online games, equalization of performance between collaborative nodes is one of important issues as well as explicit performance such as bandwidth, delay and packet loss rate. Selection of the server which can offer equal performance to collaborative nodes is necessary to offer equalized performance. Therefore,...
The performance of TCP-based applications depends on the selection of queue management mechanism in network routers and how well its control decisions are made. Fast Congestion Notification (FN) mechanism enables the two control decisions, packet admissions and congestion control directing, to be made together. This permits sending congestion avoidance notification as early as required, even if the...
When CMOS is operated at a supply voltage of 0.5V and below, Random Dopant Fluctuations (RDFs) result in a stochastic component of logic delay that can be comparable to the nominal delay. Moreover, the Probability Density Function (PDF) of this stochastic delay can be highly non-Gaussian. The Non-Linear, Operating Point Analysis of Local Variations (NLOPALV) technique has been shown to be accurate...
To successfully deliver the IPTV content to end-users, robust and resource-efficient error recovery techniques are required that can overcome the problems encountered during the end-to-end delivery process. To achieve this objective by also enabling quick error recovery, one preferred approach is to install a dedicated server, referred to as the error recovery server, between the head-end office and...
Inexact Circuits or circuits in which the accuracy of the output can be traded for energy or delay savings, have been receiving increasing attention of late due to invariable inaccuracies in designs as Moore's law approaches the low nanometer range, and a concomitant growing desire for ultra low energy systems. In this paper, we present a novel design-level technique called probabilistic pruning to...
False and nuisance alarms are major problems in the process industry. Techniques like deadbands, delay-timers, and filtering can significantly reduce these false and nuisance alarms. The down-side, however, is that using these techniques introduces some delay in raising the alarm (detection delay). In this paper, detection delays caused by deadband and delay-timer techniques are calculated using Markov...
We consider the problem of detecting rare events in a real data set with structural interdependencies. The real data set is modeled using hidden Markov models (HMMs), and rare event detection is viewed as a variant of the quickest detection problem. We assess the feasibility of two quickest detection frameworks recently suggested. The first method is based on dynamic programming and follows a Bayesian...
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