Showing papers in "IFAC Proceedings Volumes in 1990"

TL;DR: The random codes in application of digital data links are introduced and the efficiency of this probalistic model to obtain the highest security levels is demonstrated.

TL;DR: A definition of hardness of tautologies is presented and it is stated that a boolean representation of a system, although resulting in a large formula, often is easily verifyed.

TL;DR: A short overview of the complete CIM Reference Model developed by the International Purdue Workshop on Industrial Computer Systems is presented, which offers one way of separating the computer based funclions in a CIM system from those which must be carried out by humans.

TL;DR: Simulation results are presented for comparing the performance of the controllers proposed, and to illustrate the advantages of such fuzzy PID controllers over that of the conventional PID controller.

TL;DR: The recent development of the Edge theorem by Bartlett, Hollot, and Lin has shed some light on both Kharitonov's theorems, and on its discrete counterparts.

TL;DR: In this article, two approaches to fault detection in robotic systems have been discussed: the first approach consists of the use of a linear Luenberger state observer, which generates a robust residual that is maximally sensitive to the faults that have to he detected while remaining unsensitive to the neglected non-linearities.

TL;DR: In this paper, an H ∞ mixed sensitivity design problem is formulated to achieve good disturbance rejection and tracking properties as well as robust stability, and conditions on the weights that guarantee the optimization problem is well-defined.

TL;DR: The problems of knowledge representation include the need to represent dynamic qualitative knowledge, dynamic analytic knowledge and the deep structure of the process, and a structure which includes these considerations is presented.

TL;DR: An improved state variable filter is introduced which reduces the estimation errors substantially by means of interpolation techniques and is suitable for on-line process identification even in case of fast sampling.

TL;DR: In this paper, the authors describe a general methodology for the fault diagnosis of machines and drives by using few sensors, dynamic process and signal models and parameter estimation, which are then fed into a knowledge based fault diagnosis component.

TL;DR: It is shown that, if the extension principle is used, then any estimator or controller designed in the expanded spaces is contractible to the original spaces for implementation and, if an estimator designed for the expanded system achieves good~timation, then the contracted estimator also achives goodestimation for the original system.

TL;DR: Current research is aimed at using the traffic information that SCOOT provides for formation of a traffic database, detection of incidents, monitoring of congestion and integration with a dynamic route guidance system.

TL;DR: In this paper, the dynamics and stability of nonacyclic manufacturing systems are studied and the associated problems of real-time scheduling are discussed. But the authors do not consider the case where the buffer at each machine is empty.

TL;DR: Two dynamic models are formulated for the expressway and for the surface street network, respectively, which together form a large scale system which underlines the benefit of coordinated, traffic responsive control strategies.

TL;DR: In this paper, an approach to statistical estimation in which a linearly parametrised regression model is identified, that is consistent with specified physical knowledge and explains the data best is presented.

TL;DR: In this paper, the general features of a ship guidance system are discussed and the structure of a high precision track controller is presented, which includes the planning of a full manoeuvre trajectory for track changes.

TL;DR: In this paper, the authors present the design, generation, and implementation of the coordinating discrete event control code using Petri nets for an operaung flexible manufacturing system, which is a one sixth scale physical model of a shop which both performs machining operations and assembly.

TL;DR: OPAC (Optimization Policies for Adaptive Control) as discussed by the authors is a computational strategy for demand-responsive decentralized traffic signal control that is being developed and tested in the United States and has the following features: (1) it calculates controls that approach the theoretical optimimum; (2) it requires on-line data from upstream approach detectors and from neighboring intersection; and (3) it forms a building block for demandresponsive decentralized control in a network.

TL;DR: An algorithm is presented, which can be used in an adaptive context in order to handle different rates of variation or limited flow of information in time-varying dynamic systems able to handle the slow as well as the abrupt timevariations of the system parameters.

TL;DR: In this article, a method of grouping parts to reduce the complexity of assembly sequence planning is presented, based on the assumption that the sequence of assembly within a group may not be interrupted by parts from outside that group.

TL;DR: Shinayakana Approach as mentioned in this paper is a framework for solving modeling, control and decision making problems in socio-economic systems, in which mathematical models and formal tools provide the problem solving support only, and therefore, the essential parts of the problem-solving are the issues of human-computer interaction.

TL;DR: In this article, a relay auto-tuner is used to determine a point on the Nyquist curve where the phaselag is close to 180°, which is then tracked by the parameter estimator.

TL;DR: In this article, a variable structure control scheme is developed for the trajectory control of robot manipulators in the pressence of disturbances, parameter variations and nonlinear dynamic interactions, which avoids the requirement of persistency of excitation, and the convergence of overall transient is exponential.

TL;DR: In this paper, the authors demonstrate the application of multilayer perceptrons to the problem of equalisation in digital communications systems and demonstrate that their performance as an adaptive equaliser is superior to that of the linear transversal equaliser.

TL;DR: This method enhances the numerical algorithm conditioning and facilitates the selection of a high excited identification sequence improving the parameter identifiability of robot model.

TL;DR: The original algorithm devised by Albus is very simple to compute but is slow to converge, and the second part of the paper investigates various methods of speeding up the algorithm.

TL;DR: Through the experience of applying ESTRAC-III to a large and complicated railway network operated in real life, it is confirmed that this system can support human experts efficiently and effectively.

TL;DR: A formal model for the Coordination Level of Intelligent Machines is established and a case study for a simple intelligent manipulator system illustrates the proposed model and the simulation verifies the soundness of the theory.

TL;DR: In this paper, an H ∞ approach is considered to the problem of designing a robust linear estimator for discrete time stationary systems, which represents a new class of estimation problem motivated by the need to keep the estimation error spectrum small over a range of frequencies.

TL;DR: The proposed traffic control formulation can determines the optimal inflow from each on-ramp so that the system effectiveness measures of the entire expressway network would be maximized, while the expressway user under control may choose the travel route using the provided informations.