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Proceedings of IEEE Systems Man and Cybernetics Conference - SMC

17-20 Oct. 1993

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  • Service and public systems: opportunities for systems engineering

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (138 KB)

    Summary form only given. In considering the impact of technology on society and productivity, most of the attention has been focused on production and manufacturing. However, in most technologically-advanced countries, the service sector is larger than its manufacturing base. Yet, the service sector is one of the least researched - and lowest in productivity - areas of the economy. Financial, heal... View full abstract»

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  • Domain identification using a Landau transform. A finite-element approach

    Publication Year: 1993, Page(s):48 - 53 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (305 KB)

    We present an algorithm for the computation of an optimal domain for a system described by an elliptic equation. By using the Landau transform, as suggested by Pironneau, the problem of domain identification is shown to be equivalent to the problem of function identification. A finite-element discretization of this problem is given and a gradient method (steepest descent) is then presented. Finall... View full abstract»

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  • Decision support in diabetes management for optimal glycaemic control by insulin administration

    Publication Year: 1993, Page(s):391 - 396 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (462 KB)

    Optimal glycaemic control is achieved by diet manipulation and insulin administration. The potential benefits in using decision support systems for diabetic patient management are the cost saving they provide in terms of expensive man hours of verbal instruction by medical experts and the support in terms of objective and consistent decision making by the experts. This paper describes an expert sy... View full abstract»

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  • Object-oriented expert systems for fault diagnosis

    Publication Year: 1993, Page(s):102 - 107 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Using a combination of technologies for object-oriented database system and expert system may prove beneficial to the future task for diagnosing fault under distribution systems. A object-oriented expert system, can be used more intelligently and efficiently to access very large diagnostic information and release an abnormal state in distribution systems, is proposed and discussed in the paper. To... View full abstract»

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  • Nonlinear digital control of a synchronous motor: comparative simulation results

    Publication Year: 1993, Page(s):96 - 101 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    In this paper, a comparison is done among different kinds of control strategies for synchronous motors. A classical PI controller is successively confronted with more sophisticated nonlinear and multirate controls. The effectiveness of these control schemes have been tested by means of simulations. The computation delay and the presence of the inverter have been taken into account, to consider a s... View full abstract»

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  • Singularly perturbed methods for digital control of a synchronous motor

    Publication Year: 1993, Page(s):90 - 95 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    This paper deals with the control under sampling of nonlinear singularly perturbed systems. Discretization schemes for such systems are proposed, on the basis of a two time scale control law. The control under sampling of synchronous motors in a (α-β) representation is considered as a case study. This allows us to underline some pathology due to the discretization and reduction of this ... View full abstract»

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  • Adaptive nonlinear control of induction motors with flux observer

    Publication Year: 1993, Page(s):84 - 89 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    In this paper we present an adaptive nonlinear speed control algorithm for induction motors. Input-output linearisation techniques are used to track torque and rotor flux and the scheme is extended for speed control. The adaptation, based on Lyapunov-design can cope with rotor and stator resistance variations while preserving stability. Exact current limitation is achieved in the known parameter c... View full abstract»

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  • Ecologo economic model and solvability of harmonization problem

    Publication Year: 1993, Page(s):339 - 343 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Two-level decision-making systems,for example, of the type “local administration-industrial enterprise” are considered. The property of existence of an optimal (in some special senses) vector of all system's controls is called the harmonizability of interests of the parties. A few possible statements of the harmonization problems are presented and some conditions of their solvability a... View full abstract»

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  • Control or a nonlinear thermal system via internal areas

    Publication Year: 1993, Page(s):54 - 58 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    In this paper we are concerned with the problem of controlling the state evolution of a thermal system where the control variables are in internal areas of the system domain. The system is governed by the nonlinear heat equation which is approximated numerically by means of a finite element method of first order in space and an implicit scheme in time. The descretized state equation is solved by t... View full abstract»

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  • Experimental validation of the minimum energy approach for induction motor control

    Publication Year: 1993, Page(s):78 - 83 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Induction motors are a reliable and economic choice for a large range of applications. The rapid development of semiconductor technology together with powerful electronic components, provide the use of complex control schemes needed for induction motors when high performance is required. In this paper the concept of minimum energy torque control of induction motors is experimentally validated. Thi... View full abstract»

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  • Visualization of corn acquired from stereovision

    Publication Year: 1993, Page(s):334 - 338 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The automatic acquisition of the geometrical structure of crop plants is very useful for visualizing them. We propose to obtain 3D geometrical data from stereo vision. Moreover, the 3D reconstruction of plants is relevant for evaluating the growth of plants with time. Two methods of stereo vision are presented View full abstract»

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  • How autonomous agents can be adapted? towards a theory of autonomy

    Publication Year: 1993, Page(s):294 - 299 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The paper proposes to enlarge the theory of control into a theory of autonomy, inspired from the sensorimotor autonomy in nature. This theory can be useful to understand how autonomous agents, whether natural or artificial, can maintain their viability in complex environments View full abstract»

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  • Modelling and simulating for optimal management of underground railway systems

    Publication Year: 1993, Page(s):131 - 135 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The problem of determining suitable schedule for the train traffic on an underground railway network is faced in this paper. In particular lines made up of track circuits (TCs) are considered. A `tentative' schedule Is obtained by the solution of a mathematical optimization problem, which consider a simple model. Then, a deterministic event-driven simulator receives the tentative schedule as input... View full abstract»

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  • A field-oriented induction motor drive with a nonlinear state observer

    Publication Year: 1993, Page(s):71 - 77 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Direct field-oriented technique for high-performance control of induction motors requires the use of rotor flux magnitude and angular position. Whenever direct measure of the rotor flux is not available an observer must be included in the control loop to reconstruct the flux using available measurements, like rotor speed and stator currents and voltages. In this paper the use of a nonlinear closed... View full abstract»

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  • Complexity and stability of international security. A dynamic approach

    Publication Year: 1993, Page(s):329 - 333 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The growing tendency towards complexity, instability and uncertainty in international security is analysed within the framework of a nonlinear and time-discrete dynamic model, describing the interaction between security aspects and other relevant variables from different fields. Actors in the international area are assumed to act according to certain objectives and criteria. Increasingly, military... View full abstract»

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  • Optimization and search

    Publication Year: 1993, Page(s):288 - 293 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Search theory consists of models and optimization algorithms to find the best way to search for hidden targets. The difficulty of optimizing the search path is related to the motion, if any, of the target. If the target is stationary, the main optimal search problems have been essentially solved, as is outlined in Stone's classic text, while if the target's motion is much slower than the searcher'... View full abstract»

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  • A non-linear multialveolar model of the mechanical behavior of the human lung

    Publication Year: 1993, Page(s):126 - 130 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A mathematical multialveolar model has been developed which describes the mechanical behavior of the human ventilatory system in healthy subjects, under plethysmograph test conditions. It is based on the morphometric scheme of Weibel (1989) and uses the equations described by Pedley (1970) for modeling the airflow resistance. The 23 airways generations are grouped in four different levels on the b... View full abstract»

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  • Safe active robotic devices for surgery

    Publication Year: 1993, Page(s):355 - 358 vol.5
    Cited by:  Papers (3)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    When comparing current applications of robots with the use of surgical robotic devices it can be appreciated that a key difference is that the device cannot be separated from surgeon or patient to complete the task. This direct interaction has dramatic implications for the design of such systems. This paper considers examples of robotic devices applied to different surgical tasks that illustrate t... View full abstract»

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  • Control of robots with lightweight links using positive modal feedback

    Publication Year: 1993, Page(s):379 - 384 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    In previous papers (1990, 1991), the authors had developed a fully coupled, nonlinear dynamic model of a two degree of freedom manipulator with a lightweight link. The present paper considers a single degree of motion of such a manipulator to evaluate the effectiveness of the positive modal feedback scheme in suppressing the modal vibrations of the link. Simulation and experimental results are pre... View full abstract»

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  • Regional observability of a thermal system

    Publication Year: 1993, Page(s):42 - 47 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The realization of a ceramic protector covering the subregion of a substrate and the use of chemical vapor deposition technique require the temperature field in the deposition zone to be controlled. A feedback control of this temperature is based on the knowledge of the temperature in the considered subregion. The difficulty which occurs is due to the fact that measurements can only be obtained ou... View full abstract»

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  • Optimal models of fractional integrators and application to systems with fading memory

    Publication Year: 1993, Page(s):65 - 70 vol.5
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Dynamic input-output models of fractional integrators are presented. They are based on simple diffusion equations and offer many advantages, namely nonheredity and easy and efficient numerical approximation possibilities via standard methods. An abstract linear hyperbolic system with fractional fading memory is analysed via this approach, in the aim of demonstrating the suitability of such tools View full abstract»

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  • A co-pilot architecture based on a multi-expert system and a real-time environment

    Publication Year: 1993, Page(s):312 - 317 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Describes a work carried out in the frame of the European Prometheus project, and concerns the realization of an electronic copilot using a knowledge-based system approach. A flexible software architecture is required to allow problem solving in dynamic real-time situations, including rapidly changing data, asynchronous data management, interrupt handling and temporal reasoning. This paper describ... View full abstract»

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  • Real time hand gesture recognition using 3D prediction model

    Publication Year: 1993, Page(s):324 - 328 vol.5
    Cited by:  Papers (10)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    This paper proposes a new hand gesture recognition method using a 3D prediction model used for developing human-computer interfaces. It focuses on real-time hand-pose estimation, which is indispensable for virtual object manipulation. In the first stage, simple but effective parallel pipelined algorithms are employed to extract hand features from binocular images. In the second stage, the hand pos... View full abstract»

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  • Towards an approach for developing knowledge based systems for procedure-oriented operations

    Publication Year: 1993, Page(s):282 - 287 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Operations which are primarily based on procedures and which are designed to monitor conformance to these procedures can be considered to be procedure-oriented. Workers or operators in such environments tend to replace the cumbersome procedures with informal heuristics which, while enabling them to achieve higher efficiency in their operations, also increase the possibility or errors as well as in... View full abstract»

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  • Identification of system failure causes using bond graph models

    Publication Year: 1993, Page(s):269 - 274 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper proposes the use of bond graphs in system reliability analysis to obtain combinations of component failures and disturbances leading to the system failure. Since bond graphs show a direct correspondence between their component and physical phenomena to be modeled, it is easy to obtain not only a system model, but also component failure representations. The system bond graph can be easil... View full abstract»

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