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This paper proposes a closed-loop frequency-based method for parametric identification of Wiener type plants with a transport delay in the linear part using a relay feedback. The method is a generalization of Ziegler Nichols' (ZN) experiment, with relay added in the control loop. It provides a simultaneous estimation of the linear plant dynamic, value of the time delay and approximate model of the...
Plasma etch is a semiconductor manufacturing process during which material is removed from the surface of semiconducting wafers, typically made of silicon, using gases in plasma form. A host of chemical and electrical complexities make the etch process notoriously difficult to model and troublesome to control. This work demonstrates the use of a real-time model predictive control scheme to control...
This paper proposes a mechanism on reducing power consumption by using threshold and timer in home gateway. Traffic consists of real time and non-real time traffic. Proposed mechanism uses sleep mode, which can be extracted from the traffic with a protocol features and also takes advantage of buffer threshold mechanism and timer constraint for extending sleep mode. The extended sleep mode can save...
Demands for avionics Wavelength Division Multiplexing (WDM) network have been increasing dramatically in multicasting applications such as the in-flight multimedia in recent years. The topic of multicasting routing problem has been investigated with enthusiasm, because a proper design of routing can not only make full use of the resource, but also improve the performance of networks. However, different...
This article deals with the radiation of sound from ultrasonic transducers located on a flat surface and bounding a shear flow. The aim of the experiments is to measure time delays between flushed transducers in order to characterize flow velocity. Considering that the sound has an infinitely small wavelength, comparison between numerical (simulated using Matlab) and experimental results shows that...
Sustainable computer networking approaches adapt network node power states dynamically in response to traffic demand. This scenario imposes new challenges to the way the network resilience is evaluated based on reliability and availability metrics. The traditional assessments of reliability and availability based on Markov models or the Cut-Set and Tie-Set techniques are based on static values and...
The ongoing substitution of conventional power plants by renewable energy resources (RES) in Europe leads to new challenges for the operation of future power systems. Grid auxiliary services like frequency control which are traditionally provided by a few dedicated large power plants may in the future be realized by smaller generation units or loads. This paper discusses the applicability of small...
Recently, it has been studied how to reduce the probability of interception and to increase the efficient security in the wireless digital communication systems. Among the possible approaches for the information security, the chaotic signal can be used to encode information very efficiently in many ways due to the inherent characteristic of irregularity. In this paper, in noise and interference environment,...
This paper is concerned with chaos in a delay difference equation. The map of the system is proved to be chaotic in the sense of both Devaney and Li-Yorke under some conditions, by employing the snap-back repeller theory. Some computer simulations are provided to illustrate the theoretical result.
This paper reports experimental analysis of human characteristic in the lever operation by utilizing the stabilization task of cart-pendulum system. Previous studies have shown that there was a difference in the velocity distribution of the cart in the difference of the skill level. Then, cart-pendulum simulator is newly constructed and training that does the stabilization operation is done for five...
Prior researches of generalized predictive control (GPC) in teleoperation systems have mainly considered short transmitted time delays or single degree of freedom (DOF) manipulators of master and slave. This paper presents a GPC strategy for space teleoperation systems in which the master and slave manipulators are both multi-DOF and the communication network brings long time-varying delays. The nonlinear...
A methodology is developed to use the fuzzy truth values of preference statements for feasible states in an option prioritization technique in order to rank states within the framework of the Graph Model for Conflict Resolution. Option prioritization ranks states based on the truth values of preference statements, which are compositions of the decision makers' courses of actions joined by logical...
Due to the coexistence of different generations of mobile radio technologies, more and more mobile network operators are keen on deploying multiple radio technologies on a single cell site and carry their traffic over a common transport network. This paper studies such a collocated multiradio system: collocated LTE and HSDPA. Firstly, we investigate the potential gain by using a shared transport network...
We focus on the problem of links scheduling in heterogeneous wireless sensor networks. Links scheduling becomes more difficult due to the diversity of workload among sensor nodes. An improper links scheduling strategy will lead to high end-to-end delay and then diminish the data availability. We assume the energy cost of state transition cannot be ignored, especially for wireless multimedia sensor...
In this paper, a partial dependent prey-predator model with discrete and distributed delays is studied by using the theory of functional differential equation and Hassard's method, the conditions on which positive equilibrium exists and Hopf bifurcation occurs are given, finally, numerical simulations are also included.
Inter-vehicle communication is considered as a major problem to vehicular environment. Here, an analytical framework is developed to investigate the reliability of end-to-end information relay process along a platoon of vehicles. The reliability of inter-vehicle communication is measured by the probability of success for information to travel to a known destination and by the required number of hops...
Time Reversal (TR) technique is applied to localize an UWB source inside a building or buried under rubble produced by disasters. The reversed field is calculated by the FDTD-TR method applying as boundary conditions the field measured, but reversed in time, at some observation points located on the boundary. A refinement of the estimated position of the UWB emitter is carried out by a novel method...
Influence of small time-delays in coupling between noisy excitable systems on the coherence resonance and self-induced stochastic resonance is studied. Parameters of delayed coupled deterministic excitable units are chosen such that the system has only one attractor, namely the stationary state, for any value of the coupling and the time-lag. Addition of white noise induces qualitatively different...
Mixed traffic denotes the coexistence of two driving styles: human and automated driving. Until now, there has been an ambiguity about the driver's safety in mixed traffic. Traffic safety studies focus on a synthesis of control laws which help drivers to avoid or mitigate collisions. Classic safety descriptors use only the time to collision, a time criterion for safety assessment. Other assess traffic...
Recently several artificial intelligence labs have suggested the use of fully equipped vehicles with the capability of sensing the surrounding environment to enhance roadway safety. As a result, it is anticipated in the future that many vehicles will be autonomous and thus there is a need to optimize the movement of these vehicles. This paper presents a new tool for optimizing the movements of autonomous...
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