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Proceedings of 3rd International Symposium on Uncertainty Modeling and Analysis and Annual Conference of the North American Fuzzy Information Processing Society

17-20 Sept. 1995

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  • Proceedings of 3rd International Symposium on Uncertainty Modeling and Analysis and Annual Conference of the North American Fuzzy Information Processing Society

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (556 KB)
    Freely Available from IEEE
  • An evaluation the uncertainty of textual data with logic and statistics

    Publication Year: 1995, Page(s):739 - 744
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    We describe the problem of conjunctions of coordinations in the French language. The paper treats textual data. Most document retrieval for user queries can be specified in the form of Boolean expressions. There is uncertainty and flaws in combining queries. Many of the ambiguities in text are due to the use of classical methods of computing. The idea of the work is to extract the "reach" of the c... View full abstract»

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  • Fuzzy system representation of car-following phenomena

    Publication Year: 1995, Page(s):798 - 799
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    Summary form only given. Understanding the way vehicles interact with one another within a traffic stream is an important topic in transportation engineering. The specific situation being studied is when a driver is following another vehicle because his/her speed is constrained by the vehicle ahead, or roadway or traffic conditions that do not allow passing. This is termed a car-following situatio... View full abstract»

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  • Author index

    Publication Year: 1995
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    Freely Available from IEEE
  • Adaptivity in a hierarchical fuzzy model

    Publication Year: 1995, Page(s):151 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A hierarchical architecture for fuzzy modeling and inference has been developed to allow adaptation based on system performance feedback. A general adaptive algorithm is presented and its performance examined for three types of adaptive behaviour: continued learning, gradual change, and drastic change. In continued learning, the underlying system does not change and the adaptive algorithm utilizes... View full abstract»

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  • Modeling geometric uncertainties of continuum structures for reliability assessment purposes

    Publication Year: 1995, Page(s):145 - 150
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A prototype computational methodology for reliability assessment of continuum structures using finite element analysis with instability failure modes is described in this paper. Examples were used to illustrate and test the methodology. Geometric and material uncertainties were considered in the finite element model. A computer program was developed to implement this methodology by integrating unc... View full abstract»

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  • A general system identification framework for structural systems

    Publication Year: 1995, Page(s):216 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    In this paper a general system identification framework for structural systems is developed. With the increase in size and complexity of structural systems, a better understanding, as well as, suitable scheme(s) for monitoring and controlling the performance of systems needs to be developed. The first stage in the development of any control and/or monitoring system, is the identification and model... View full abstract»

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  • Design of a digital fuzzifier based on successive approximation

    Publication Year: 1995, Page(s):524 - 529
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    In this paper, we present a design of a digital dynamic fuzzifier based on successive approximation. It is suitable for on-line training or on-line adaptive fuzzy control systems. With the parameters of the triangle or trapezoid membership functions and the number to be fuzzified as the inputs, it automatically calculated the proper membership values for the fuzzy control systems. The chip is desi... View full abstract»

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  • Using reliability-based models to assess rehabilitation needs

    Publication Year: 1995, Page(s):139 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Due to increasing budget constraints, funding available to maintain, rehabilitate, improve, or replace aging US Army Corps of Engineers (USACE) structures is declining with respect to funding requirements. Therefore, the available funds must be selectively invested to achieve maximum benefits. To compete for scarce appropriation resources, USACE districts are now required to justify civil works re... View full abstract»

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  • Developing robust system designs under uncertainty: a systematic approach to design evaluation

    Publication Year: 1995, Page(s):210 - 215
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    To develop quality systems, both engineering and management require fundamental principles and methodologies to guide design decision making and advanced planning. This paper presents a systematic approach to support the need for developing better system designs in the face of uncertainties. This approach is developed by integrating statistical decision theory, elements of the systems engineering ... View full abstract»

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  • Fuzzy logic, grasp preshaping for robot hands

    Publication Year: 1995, Page(s):520 - 523
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Selection of an appropriate hand shape and orientation for grasp preshaping depends on the geometry and physical properties of the target object, along with information on the goal of the task. Features of the target object and the task are mapped onto various grasp attributes. Preshaping of the robot hand is done according to the results of this mapping. A fuzzy logic grasp preshaping methodology... View full abstract»

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  • Distributions with fuzziness and randomness

    Publication Year: 1995, Page(s):668 - 673
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Both cognitive and noncognitive uncertainties can be present in the same variable. The non-cognitive uncertainty of a variable can be described by its own probability density function (PDF); whereas the cognitive uncertainty of a random variable can be described by the membership function for its fuzziness and its α-cuts. A PDF called fuzzy-random PDF is proposed in this paper based on consi... View full abstract»

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  • Fuzzy logic control of batch-feeding refuse incineration

    Publication Year: 1995, Page(s):58 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The municipal solid waste (MSW) or refuse incineration plant is designated to reduce the volume of the refuse and recover energy from it. The steam generated from a boiler heated by burning refuse is sent to a turbine to generate the electricity. Batch-feeding style and the uncertainty of refuse composites result in periodical and uncertain fluctuation of refuse-combustion and then the steam flow ... View full abstract»

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  • Fuzzy reasoning: an alternative to approximate reasoning theory

    Publication Year: 1995, Page(s):478 - 482
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Applications of fuzzy logic to fuzzy control are very popular. However, for more general fuzzy reasoning problems, there are a number of important ideas that must be addressed. We discuss these topics: (1) The theory of approximate reasoning may be of dubious utility in fuzzy reasoning systems: we present examples of fuzzy rules which cannot be evaluated by approximate reasoning. (2) In fuzzy reas... View full abstract»

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  • Fuzzy scheduling of robots in CIM environment

    Publication Year: 1995, Page(s):782 - 787
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A problem of scheduling a transportation robot in a production line with uncertain input data is considered. The data is presented by fuzzy numbers. A heuristic algorithm based on operations over the fuzzy numbers is developed. In the case of exact input data the algorithm produces an exact solution, its complexity being O(m3), where m is the number of workstations in the line. The fuzz... View full abstract»

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  • Signal parameter estimation when the parameters are fuzzy variables

    Publication Year: 1995, Page(s):595 - 600
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    We present a methodology for estimation of the fuzzy parameters of a stochastic signal. The proposed approach minimizes a fuzzy average decision error probability by a proper choice of decision regions. We use a scalar index, called the total distance criterion (TDC) ranking index, in order to rank the fuzzy average decision error probabilities of different decision rules. We identify, the optimal... View full abstract»

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  • Tail effects of uncertainty modeling in QRA

    Publication Year: 1995, Page(s):133 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The paper discusses the general feeling of uneasiness engineers and scientists experience when they assume probability models for basic uncertainties governing a risk or reliability analysis. Specifically, the aspect of tail behaviour is addressed. It is well known that quantitative risk estimation is critically dependent on the tail behavior. The present paper focuses an tail heaviness and the ef... View full abstract»

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  • Effects of the shape of fuzzy membership functions on fuzzy inference

    Publication Year: 1995, Page(s):32 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The paper investigates the effect of the shapes of membership functions on a fuzzy inference system to detect a signal in a noisy waveform. The detector, which uses values of features derived from the waveform, can classify the waveform as signal or noise, or it can be uncertain, that is, it can decide that no conclusion regarding presence or absence of a signal can be drawn. Piecewise linear memb... View full abstract»

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  • Design of fuzzy seawater lift pump system in fossil fired power plant

    Publication Year: 1995, Page(s):204 - 208
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The Sea Water Lift Pump (SLP) system is responsible for maintaining the open canal level to provide the suction flow of Circulating Water Pump (CWP) at the set point. The response of the SLP system is so slow that it is difficult to maintain an optimal open canal level by manual or two step pump speed control operation and to reduce overflow of seawater. The objective of this paper is to apply the... View full abstract»

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  • Fuzzy interactive multiobjective optimization on borrowing/lending problems

    Publication Year: 1995, Page(s):513 - 518
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The paper presents an application of fuzzy set theory applied to optimization problems, where there exist multiple goals. We present the fuzzy multiobjective linear programming with fuzzy parameter model for borrowing/lending problem, and the steps followed to convert it to an ordinary nonlinear programming problem, which finally is solved. An example along with its result is presented to illustra... View full abstract»

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  • Nonstationary seismic response of highway bridges supported on columns

    Publication Year: 1995, Page(s):449 - 454
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The seismic displacement of a bridge superstructure relative to its substructure (columns) is studied, including uncertainty of the seismic input. The earthquake excitation is modeled as white noise filtered by the Clough-Penzien (1975) filter, in cascade with modulation accounting for seismic intensity nonstationarity. An analytical solution is obtained for the statistics of the relative displace... View full abstract»

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  • Fuzzy and probabilistic interpretation of spectral information

    Publication Year: 1995, Page(s):662 - 667
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The paper shows on a spectroscopical example, how expert knowledge can be modeled by fuzzy sets or in the probabilistic sense as conditional density functions. Fuzzy sets, so-called fuzzy observations, are used to model the information available about frequency positions of main vibrations. These vibrations appear in infrared or RAMAN spectra as absorption bands. The calculation of such vibrations... View full abstract»

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  • A mathematical relationship between set-theoretic and metric compatibility measures

    Publication Year: 1995, Page(s):169 - 174
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    Because of the diversity of fuzzy set applications, a wide variety of compatibility measures have been employed to assess the degree of agreement between two fuzzy sets. Set theoretic compatibility measures are the ones predominantly found in the literature and are based on determining the commonality between two fuzzy sets. Recently, however, metric compatibility measures are being used to assess... View full abstract»

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  • Self-learning fuzzy control of civil structures

    Publication Year: 1995, Page(s):52 - 57
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The application of ANFIS (Adaptive Network-based Fuzzy Inference System) to the fuzzy control of structures was investigated by the authors in a earlier paper (L. Faravelli and T. Yao, 1994). Through neural network learning, ANFIS can be trained to replace an existing fuzzy controller. The resulting controller makes use of the more efficient Takagi-Sugeno inference scheme instead of COG (center of... View full abstract»

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  • Reliability analysis of a reinforced concrete drainage structure

    Publication Year: 1995, Page(s):466 - 471
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A reliability assessment was performed to examine potential modes of unsatisfactory performance for a six-barrel gravity drainage structure and pumping plant located under a 33-ft-high levee section. The structure is composed of reinforced concrete which has suffered severe structural deterioration and exposure of reinforcement. This structure is a critical element in the levee system that protect... View full abstract»

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