Two linear feedback control algorithms for handling and preventing congestion in broadband asynchronous transfer mode networks are proposed and analyzed. The fluid approximation model is described with a continuous-ti...
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Two linear feedback control algorithms for handling and preventing congestion in broadband asynchronous transfer mode networks are proposed and analyzed. The fluid approximation model is described with a continuous-time system of delay-differential equations. The algorithms are asymptotically stable, and the transient processes are nonoscillatory. The control parameters are locally optimal (optimality is based on the asymptotic rate of convergence). The results of numerical experiments suggest that these parameters are globally optimal as well.
The Adaptive Resonance Theory (ART) neural network is a novel method for the cell formation problem in group technology (GT). The advantages of using an ART network over other conventional methods are its fast computa...
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The Adaptive Resonance Theory (ART) neural network is a novel method for the cell formation problem in group technology (GT). The advantages of using an ART network over other conventional methods are its fast computation and the outstanding ability to handle large scale industrial problems. One weakness of this approach is that the quality of a grouping solution is highly dependent on the initial disposition of the machine-part incidence matrix especially in the presence of bottleneck machines and/or bottleneck parts. The effort of this paper has been aimed at alleviating the above mentioned problem by the introduction of a set of supplementary procedures. The advantages of the supplementary procedures are demonstrated by 40 examples from the literature. The results clearly demonstrate that our algorithm is more reliable and efficient in cases of ill-structured data.
A new control method for temperature control is presented which utilizes both a time-integrated value (TIV) and an instantaneous value of inside air temperature as the basis for making control decisions. Current contr...
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A new control method for temperature control is presented which utilizes both a time-integrated value (TIV) and an instantaneous value of inside air temperature as the basis for making control decisions. Current control strategies neglect the thermal history of both the air space and the animal but there are gains to be made by using a control algorithm that employs dynamic control of the target control variable. It is demonstrated that increased economic efficiency is obtained using time-integrated control. Simulation analysis was used to predict energy savings and changes in bird performance for a series of TIV control algorithms. On the basis of these simulations, it was concluded that the TIV control strategy imporoved net returns compared with those obtained using a conventional control strategy. TIV control targets for temperature should be selected to reduce excessive fan usage and to prevent any mortality if at all possible. The economic parameters assumed for feed cost and meat value have a large impact on the selection of an optimal control strategy. (C) 1995 Silsoe Research Institute
This article investigates steering control methods for the articulated body mobile robot KORYU-II (KR-lI), a mechanical model composed of seven segments, with total length 3.3 m and total weight 330 kg. The objective ...
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This article investigates steering control methods for the articulated body mobile robot KORYU-II (KR-lI), a mechanical model composed of seven segments, with total length 3.3 m and total weight 330 kg. The objective is to generate joint commands for...
Rate-based congestion control is effective and still simple for traffic management in ATM networks. One of its practical realization schemes is the enhanced proportional rate control algorithm (EPRCA) which has been p...
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ISBN:
(纸本)0780325109
Rate-based congestion control is effective and still simple for traffic management in ATM networks. One of its practical realization schemes is the enhanced proportional rate control algorithm (EPRCA) which has been proposed and adopted as a standard for traffic management scheme in the ATM Forum. An analysis for the EPRCA is provided for a network with homogeneous source traffic and a single bottleneck ATM link to investigate the dynamic behavior of the EPRCA. In addition to three types of switches suggested in the EPRCA, a prioritized switch is newly proposed. We exploit the dynamical behavior of the EPRCA and obtain the maximum queue length at the switch and the throughput by using the first-order fluid approximation method. Equations for parameter tuning for the EPRCA are also provided.
We describe a method of object-selective quantizer control in a standard coding system based on MC DCT-CCITT Recommendation H.261. The approach is based on two novel algorithms, namely buffer rate modulation and buffe...
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ISBN:
(纸本)0780331222
We describe a method of object-selective quantizer control in a standard coding system based on MC DCT-CCITT Recommendation H.261. The approach is based on two novel algorithms, namely buffer rate modulation and buffer size modulation. By forcing the rate control algorithm to transfer a relatively small fraction-about 10-15% on average-of the total available bit rate from the coding of the non-facial to that of the facial area, in head-and-shoulders videoteleconferencing sequences, images with better-rendered facial features are obtained, i.e. blocky artifacts in the facial area are less pronounced and eye contact and lip-sync are preserved. The improvement was found to be perceptually significant on video sequences coded at the rate of 64 kbps, with 48 kbps allocated for the input (color) video signal in QCIF format.
A method of synthesizing a control system comprising a most inner positive voltage feedback loop and an inner negative voltage feedback loop and an outer negative voltage feedback loop is presented. The control system...
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A method of synthesizing a control system comprising a most inner positive voltage feedback loop and an inner negative voltage feedback loop and an outer negative voltage feedback loop is presented. The control system error is forced to zero in steady state and minimized in transient in response to either input command change or external disturbance. No current through the plant under the control is sensed and no parameters of the plant are required to be known implying minimization of measurement noise and adaptive/self-tuning operation, respectively. The method is used to synthesize load-independent and input-voltage-independent switch-mode power converters as well as electric motor drive systems, incorporating any kind of electric motor, of maximized disturbance rejection ratio and minimized dynamics.
Symbolic languages are increasingly being used in the analysis and implementation of control algorithms. Many of these control procedures involve some type of differentiation or Jacobian formulation. Automatic differe...
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Symbolic languages are increasingly being used in the analysis and implementation of control algorithms. Many of these control procedures involve some type of differentiation or Jacobian formulation. Automatic differentiation provides an alternative means of computing this information which is rarely considered in the control literature. This correspondence will discuss the use of automatic differentiation. Numerical results comparing the use of automatic differentiation and symbolic approaches in the context of a particular nonlinear control system will be given.
A method to transmit multiplexed digital video that potentially allows for video quality and capacity gains over conventional constant bit-rate (CBR) transmission is described. The method uses a joint rate control alg...
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A method to transmit multiplexed digital video that potentially allows for video quality and capacity gains over conventional constant bit-rate (CBR) transmission is described. The method uses a joint rate control algorithm that regulates the encoders during buffer congestion periods using bandwidth re-allocation and source rate control. A multichannel joint rate control algorithm is described and its performance simulated for MPEG encoded video on a typical Direct Broadcast Satellite (DBS) indicate significant capacity and/or quality gains conventional CBR transmission methods.
As the deployment of high-speed fiber transmission systems has been accelerated, they are widely recognized as a firm infrastructure of our information society. Under this circumstance, the importance of network survi...
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As the deployment of high-speed fiber transmission systems has been accelerated, they are widely recognized as a firm infrastructure of our information society. Under this circumstance, the importance of network survivability has been increasing rapidly in these days. In SONET, the self-healing networks have been highlighted as one of the most advanced mechanisms to realize SONET survivable networks. Several schemes have been proposed and studied actively due to a rapid progress on the development of highly intelligent NE's. Among them in this paper, a DCS based distributed self-healing network is discussed from a viewpoint of its control algorithms. Specifically, our self-healing algorithm called TRANS is explained in detail, which possesses such desirable features as providing fast and flexible restoration with line and path level restoration applied to an individual STS-1 channel, capability to handle multiple and even node failures, and so on. Both software simulation and hardware experiment verify that TRANS works properly in a real distributed environment, the result of which is shown in the paper. In addition, the combined use of TRANS and the ring restoration control is proposed taking into account the use in a practical SONET.
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