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Fuzzy Information Processing Society Biannual Conference, 1994. Industrial Fuzzy Control and Intelligent Systems Conference, and the NASA Joint Technology Workshop on Neural Networks and Fuzzy Logic,

18-21 Dec. 1994

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Displaying Results 1 - 25 of 104
  • NAFIPS/IFIS/NASA '94. Proceedings of the First International Joint Conference of The North American Fuzzy Information Processing Society Biannual Conference. The Industrial Fuzzy Control and Intelligent Systems Conference, and the NASA Joint Technology Workshop on Neural Networks and Fuzzy Logic

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (273 KB)
    Freely Available from IEEE
  • Ordering fuzzy sets for class separation purposes

    Publication Year: 1994, Page(s):315 - 316
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Ranking fuzzy subsets is an important event in dealing with fuzzy decision problems in many areas, such as management sciences, engineering, and even social sciences. This issue has been of concern for many researchers over the years. Some twenty eight methods have been proposed in the publications for ranking fuzzy subsets. It is the purpose of this paper to evaluate and analyze the performance o... View full abstract»

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  • Interval valued fuzzy sets and fuzzy measures

    Publication Year: 1994, Page(s):317 - 321
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Interval valued fuzzy set generated by fuzzy disjunctive and conjunctive normal forms are proposed to be a model of type II fuzzy sets to represent the second order semantic uncertainty realized by the combination of two or more fuzzy, vague, linguistic concepts by linguistic connectives. Fuzzy measures over the interval valued fuzzy sets provide useful information such as “non-specificity&r... View full abstract»

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  • A smart instrument to evaluate roofing system performance in hurricanes

    Publication Year: 1994, Page(s):275 - 278
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A recently developed decision support system to aid nonengineering professionals in evaluating the quality of roofing systems for commercial and residential buildings is described. A description of the requirements, theoretical background, and architecture of the system is provided. The accompanying computer program is also described. Finally, the predicted quality levels of thirteen roofing syste... View full abstract»

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  • Stable adaptive fuzzy control of a DC motor

    Publication Year: 1994, Page(s):145 - 149
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A stable adaptive fuzzy control is applied to a DC motor for controlling its speed. The DC motor was modeled as a nonlinear third order system. An extension to the type of systems which the control can be applied has been developed. This extension was applied to control the speed of the DC motor. Simulation studies were performed for confirming the effectiveness of the control in this application.... View full abstract»

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  • Fuzzy logic for bridge rating using an eigenvector of priority settings

    Publication Year: 1994, Page(s):279 - 286
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    To avoid possible inconsistencies in the inspection and rating of highway bridges, a fuzzy inference model based on a priority setting obtained through the solution of an eigenvector problem invoking a pairwise comparison matrix of importance is presented. This method and the associated solution technique, originally developed for general use in multi-attribute decision making, are used to impleme... View full abstract»

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  • Fuzzy symplectic systems: a new framework for multi-stakeholder decision making

    Publication Year: 1994, Page(s):153 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The consensus seeking process in a multi-stakeholder decision-making system is considered as a fuzzy motion (without precisely defined target states) with two characteristics: urge towards consensus and freedom for decision-making. The basic structural property of such a fuzzy system is that it is symplectic-stakeholders' freedom for decision-making is preserved, independently of time, all along t... View full abstract»

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  • Computing an appropriate control strategy based only on a given plant's rule-based model is NP-hard

    Publication Year: 1994, Page(s):331 - 332
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Traditional control starts with the description (i.e. model) of a plant, and an objective to be achieved. Based on this information, methods of traditional control theory enables one to compute a control strategy. In fuzzy control, one usually does not have an accurate model of the plant and one often can not express an objective in precise mathematical terms. Instead, one has a collection of "fuz... View full abstract»

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  • An index based on superimposed coding for a fuzzy object oriented database system

    Publication Year: 1994, Page(s):289 - 290
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Next generation database applications-for example, design; environmental and scientific applications-have to cope with incomplete and uncertain data and queries. Many of the approaches to modeling uncertainty in databases are based on fuzzy set theory. However, for fuzzy data access and vague query evaluation the usual access methods are no longer usable. Thus, the need arises for efficient index ... View full abstract»

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  • Fuzzy intervals as a basis for measurement theory

    Publication Year: 1994, Page(s):405 - 406
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    We describe the problem of error estimation for indirect measurements, one of the main problems of measurement theory. We show why statistical approach is not always adequate, why interval and fuzzy approaches have their own problem, and propose a new paradigm: using fuzzy intervals as a basis for measurement theory View full abstract»

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  • A cognitively based taxonomy of fuzzy decision support systems

    Publication Year: 1994, Page(s):157 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Fuzzy decision support systems have multiplied during recent years. Zachary's cognitively based functional taxonomy of decision support techniques provides a framework to classify fuzzy decision aids. Researchers can use this classification scheme to organize fuzzy decision support systems for further study View full abstract»

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  • Autonomous vehicle following by a fuzzy logic controller

    Publication Year: 1994, Page(s):333 - 337
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    This paper presents a fuzzy logic for performing autonomous vehicle following which is defined as a vehicle controlling its own steering and speed while following a lead vehicle. This controller functions by first converting the range and heading angle observation into fuzzy variables, by executing fuzzy rules generated by a self-organizing neural network, and then by defuzzifying the resultant fu... View full abstract»

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  • Specifying vague requirements with a fuzzy logic based modeling framework

    Publication Year: 1994, Page(s):291 - 295
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Proposes a faceted requirement classification scheme for analyzing heterogeneous requirements. The representation of vague requirements is based on the canonical form in test-score semantics and an extension of the notion of soft conditions. The trade-offs analysis of conflicting soft requirements is conducted using fuzzy multi-criteria optimization techniques. The proposed approach provide a fram... View full abstract»

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  • A new genetic algorithm with statistical gene evaluation

    Publication Year: 1994, Page(s):409 - 410
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    A new genetic algorithm is proposed to approximately evaluate the gene rather than the chromosome using statistical techniques. Simple statistical quantities are used to find out the influence of individual gene during the evolution and suggest better choices for a gene. The statistical values are incorporated into the genetic operations in the rates for the gene crossover and mutation. The effect... View full abstract»

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  • Rule selection, fuzzy logic and time series

    Publication Year: 1994, Page(s):189 - 193
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    It is difficult to extract trading rules for financial trading systems. One reason is that the data often leads to conflicting rules, i.e., rules that have the same left-hand side but different right hand side. In this paper, we explore ways to deal with the problem of inconsistent rules using US ten-years bond time series data. We explore Wang's method, and identify a particular shortcoming. In a... View full abstract»

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  • A fuzzy scheme for enterprise modeling

    Publication Year: 1994, Page(s):159 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Complex systems are difficult to model and analyze. Enterprise modeling represents one of the most controversial and convoluted tasks. While models rely on subjective judgments, the majority of analytical work has been done by traditional methodologies. This paper analyses enterprise modeling from fuzzy systems perspective. Examples illustrate the relevance of similarity measures, in particular. D... View full abstract»

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  • A parametric fuzzy control module with 16 bit standard microcontroller SAB 80C166 for a modular process data system

    Publication Year: 1994, Page(s):338 - 339
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    The design and implementation of a parametric fuzzy control module for an independent modular process data and control system are presented. The module is designed to receive either precalculated process data from the internal process computer of the process data system or real time process data by connecting the fuzzy module to process sensor interfaces. A 16-bit CMOS microcontroller, the SAB 80C... View full abstract»

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  • Fuzzy logic finite state machine models for real time systems

    Publication Year: 1994, Page(s):296 - 300
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Dynamic linguistic models can be implemented by fuzzy automata. In this paper the model of the fuzzy-state-fuzzy-output finite state machine (FSFO FSM) is discussed. The FSFO FSM is realized using the concepts of crisp-state-fuzzy-output FSM (CSFO FSM) and state membership functions (SMF). A systematic method is suggested to design the state transients of the FSFO FSM by means of a specified seque... View full abstract»

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  • Genetic fuzzy clustering

    Publication Year: 1994, Page(s):411 - 415
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    This paper describes a genetic guided fuzzy clustering algorithm. The fuzzy-c-means functional Jm is used as the fitness function. In two domains the approach is shown to avoid some higher values of Jm to which the fuzzy-c-means algorithm will converge under some initializations. Hence, the genetic guided approach shows promise as a clustering tool View full abstract»

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  • An adaptive fuzzy modeling framework for characterization of subsurface contamination

    Publication Year: 1994, Page(s):194 - 195
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The objectives of characterization of subsurface contamination are to provide information for the evaluation of: (1) the environmental effects of these contaminants; and (2) alternate remediation measures. However, the procedure is very complex. Complete characterization is very time consuming and costly if not impossible. In this paper, we propose an adaptive fuzzy modeling framework for the char... View full abstract»

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  • Compatibility measures using fuzzy truth and co-implication

    Publication Year: 1994, Page(s):455 - 458
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A compatibility measure is a scaler measure that assesses some type of agreement between two fuzzy sets. The three general classes of compatibility measures are set theoretic, metric, and logic. Set theoretic compatibility measures are the ones predominantly found in the literature. Recently, however, metric and logic compatibility measures are being used. The logic class of compatibility measures... View full abstract»

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  • Fuzzy set underpinnings of oligopoly markets

    Publication Year: 1994, Page(s):161 - 165
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper describes the natural links between fuzzy sets and oligopolistic markets. Fuzzy sets are used as a tool to define and describe oligopoly markets and to demonstrate quantitatively the uncertainty intrinsic to oligopolistic industries. The values of oligopolistic uncertainty are calculated by utilizing a fuzzy entropy measure. Significant distinctions between fuzzy results and the crisp n... View full abstract»

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  • Physical system modeling using temporal fuzzy sets

    Publication Year: 1994, Page(s):429 - 433
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A family of temporal fuzzy sets is applied to modeling the dynamics of a physical system. The output trajectory of a physical process is decomposed through fuzzy partitioning into several patterns of dynamic activity. The membership functions are used in characterizing the extent to which the overall dynamics is governed by individual patterns. Simulated and real data examples are presented to ill... View full abstract»

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  • Design and performance comparison of fuzzy logic based tracking controllers

    Publication Year: 1994, Page(s):340 - 344
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Several camera tracking controllers based on fuzzy logic principles have been designed and tested in software simulation in the software technology at the Johnson Space Center. The fuzzy logic based controllers utilize range measurement and pixel positions from the image as input parameters and provide pan and tilt gimble rate commands as output. Two designs of the rule base and tuning process app... View full abstract»

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  • Fuzzy logic in case-based reasoning

    Publication Year: 1994, Page(s):301 - 302
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    This paper presents a fuzzy logic approach to address the indexing problems in case-based reasoning paradigm. The relevance of representing case indices using fuzzy sets and a scheme for rating and ranking of candidate cases using fuzzy aggregation operators are discussed. The authors also suggest employing case-based reasoning for learning in fuzzy systems. The proposed schemes are exemplified in... View full abstract»

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