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IEEE Transactions on Systems, Man, and Cybernetics

Issue 5 • Sep/Oct 1991

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Displaying Results 1 - 25 of 36
  • Direction of arrival estimation using artificial neural networks

    Publication Year: 1991, Page(s):1192 - 1201
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The maximum likelihood estimator is the optimal estimator of the direction of sources, but it requires the minimization of a complex, multimodal, multidimensional cost function. A neural optimization procedure is presented that does not require an initial estimate of the direction of the sources and offers the potential of real-time solutions to the direction of arrival problem by utilizing the fa... View full abstract»

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  • Decision models: some lessons from the field

    Publication Year: 1991, Page(s):1018 - 1026
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    Studies of decision-making in such environments as nuclear power plants, urban fire departments, command-and-control centers, and courtrooms are discussed. The studies provide a different perspective on decision strategies from laboratory studies that rely on naive subjects performing relatively context-free tasks under little time pressure and static task conditions. The field research paradigms ... View full abstract»

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  • Coherent signal-subspace processing in a sector

    Publication Year: 1991, Page(s):1088 - 1100
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    The determination of the number of wideband signals impinging on a passive sensor array in the form of multiple groups (clusters), and the estimation of their directions of arrival is addressed. The idea of preprocessing by a set of orthogonal beamformers for dimensionality reduction is used to simplify wideband processing. The effectiveness of this approach is demonstrated with the use of discret... View full abstract»

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  • A hierarchy of network-based knowledge systems

    Publication Year: 1991, Page(s):1184 - 1191
    Cited by:  Papers (5)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    An extension of the method that was used for building and using the network-based knowledge system SUPER is proposed to fully utilize the benefits of this approach in the domain of diagnosing distributed dynamically evolving processes. In the scope of distributed sensor networks, several issues are addressed concerning problems dealing with software architectures, strategies, and properties for ef... View full abstract»

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  • Applying generalized stochastic Petri nets to manufacturing systems containing nonexponential transition functions

    Publication Year: 1991, Page(s):1008 - 1017
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    Generalized stochastic Petri nets (GSPNs) are applied to flexible manufacturing systems (FMSs). Throughput subnets and s-transitions are presented. Two FMS examples containing nonexponential distributions, which were analyzed in previous papers by queuing theory and probability theory respectively, are treated using GSPNs developed using throughput subnets and s-transitions. The GSPN results agree... View full abstract»

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  • Functional characterization of fault tolerant integration in distributed sensor networks

    Publication Year: 1991, Page(s):1082 - 1087
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Fault-tolerance is an important issue in network design because sensor networks must function in a dynamic, uncertain world. A functional characterization of the fault-tolerant integration of abstract interval estimates is proposed. This model provides a preliminary version for a general framework that is hoped to develop to address the general problem of fault-tolerant integration of abstract sen... View full abstract»

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  • Partial global planning: a coordination framework for distributed hypothesis formation

    Publication Year: 1991, Page(s):1167 - 1183
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1748 KB)

    Partial global planning is used to provide a framework for coordinating multiple AI systems that are cooperating in a distributed sensor network. By combining a variety of coordination techniques into a single, unifying framework, partial global planning enables separate AI systems to reason about their roles and responsibilities as part of group problem solving, and to modify their planned proces... View full abstract»

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  • Probabilistic risk assessment of quality control and quality assurance measures in structural design

    Publication Year: 1991, Page(s):1000 - 1007
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    A probabilistic risk assessment approach used to examine the effects of human error on a typical structural engineering design task (design of a steel I-beam) is reported. This approach utilizes an event-tree methodology and a Monte Carlo simulation analysis. An investigation of the efficiency of a quality control measure (e.g. design checking) is reported that includes design checking guidelines ... View full abstract»

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  • Decisions with probabilities over finite product spaces

    Publication Year: 1991, Page(s):1238 - 1242
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Techniques for decision-making with probabilities over finite product spaces are discussed. In general, the type of decision problem generated by the available probabilistic information is one of decision under partial uncertainty: the probability distribution over the event space for the problem is determined only to the extent that it is contained in a convex polyhedron of distributions. The str... View full abstract»

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  • Optimization of detection networks. I. Tandem structures

    Publication Year: 1991, Page(s):1044 - 1059
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    A distributed binary detection problem with binary communications is considered, wherein the nodes (sensors and decision-makers) of the system are organized in a series configuration. It is shown that this problem can be reformulated as a deterministic multistage nonlinear optimal control problem. The necessary and sufficient conditions of optimality using Bayes' risk as the optimization criterion... View full abstract»

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  • Computational complexity issues in synthesis of simple distributed detection networks

    Publication Year: 1991, Page(s):1071 - 1081
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    Algorithmic issues of simple object detection problems in the context of a system consisting of a finite set of sensors that monitor a workspace are studied. Each sensor detects the presence of only a certain subset of a given set of objects O. Given that an object has been detected by a subset of sensors, the detection problem deals with identifying whether the object in the workspace is... View full abstract»

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  • Design of a fuzzy controller using input and output mapping factors

    Publication Year: 1991, Page(s):952 - 960
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A complete design procedure for a fuzzy three-term PID controller is presented. A plant model is not required to achieve this design. A reduced look-up table containing the rules along with the quantization and tuning procedures by means of input and output mapping factors are introduced. The scaling factors of the output error time sequences are preselected arbitrarily and the search for an optim... View full abstract»

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  • Linear imaging with sensor arrays on convex polygonal boundaries

    Publication Year: 1991, Page(s):1155 - 1166
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    The resolution of a linear imaging system is determined by the size of the aperture on which it measures data. For a fixed number of sensor elements, large 2-D apertures are formed when the elements are placed on the boundary of some planar region. It is proved that it is possible, in principle, to use only the boundary of some convex region as the aperture, while synthesizing the effect of having... View full abstract»

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  • OS characterization for local CFAR detection

    Publication Year: 1991, Page(s):1212 - 1216
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    An order-statistic (OS) characterization for modeling clutter statistics at local detectors is presented. Important features of the OS characterization include its structure, which allows for parallel computations, and its degrees of freedom, which enable it to track various changes in the clutter statistics. Constant-false-alarm rate (CFAR) performance for local detectors designed from the OS cha... View full abstract»

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  • Multitarget motion analysis in a DSN

    Publication Year: 1991, Page(s):1125 - 1139
    Cited by:  Papers (24)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    The data association problem in multiple target bearings-only motion analysis is considered. The measurements are target bearings obtained from passive sonars in a distributed sensor network. These measurements, after being transmitted to a processing center, are used to estimate the initial states of targets. The overall problem is formulated using the maximum likelihood principle. A two-step ite... View full abstract»

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  • Entropy: a new definition and its applications

    Publication Year: 1991, Page(s):1260 - 1270
    Cited by:  Papers (147)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Shannon's definition of entropy is critically examined and a new definition of classical entropy based on the exponential behavior of information gain is proposed along with its justification. The concept is extended to defining the global, local, and conditional entropy of a gray-level image. Based on these definitions four algorithms for object extraction are developed. One of these algorithms u... View full abstract»

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  • Fault-tolerant reconfigurable architecture for robot kinematics and dynamics computations

    Publication Year: 1991, Page(s):983 - 999
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Efficient parallel algorithms for computing the kinematics, dynamics, and Jacobian of manipulators and their corresponding inverses are discussed and analyzed, and their characteristics are identified based on the type and degree of parallelism, uniformity of the operations, fundamental operations, data dependencies, and communication requirements. Most of the algorithms for robotic computations p... View full abstract»

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  • A self-organizing binary decision tree for incrementally defined rule-based systems

    Publication Year: 1991, Page(s):1231 - 1238
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    An adaptive self-organizing concurrent system (ASOCS) model is presented for massively parallel processing of incrementally defined rule-based systems in such areas as adaptive logic, robotics, logical inference, and dynamic control. An ASOCS is an adaptive network composed of many simple computing elements operating asynchronously and in parallel. The authors focus on adaptive algorithm 3 (AA3) a... View full abstract»

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  • Coalitional fairness and distortion of utilities

    Publication Year: 1991, Page(s):1295 - 1298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The author considers the noncooperative game with strategies consisting of utility functions and whose outcomes are coalitionally fair solutions for the case of a finite number of agents who wish to divide a finite number of commodities. It is shown that for such a game any equal-income competitive equilibrium allocation for the true utilities is a Nash equilibrium outcome View full abstract»

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  • Bus-oriented load sharing for a network of sensor driven processors

    Publication Year: 1991, Page(s):1202 - 1205
    Cited by:  Papers (46)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A load-sharing problem involving the optimal allocation of measurement data among n sensor-driven processors interconnected through a bus-type communication medium is considered for three distinct architectural configurations. It is found that a minimal-time solution can be achieved if the computations by the processors end simultaneously. Simple recursions for the determination of the op... View full abstract»

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  • Information integration and synchronization in distributed sensor networks

    Publication Year: 1991, Page(s):1032 - 1043
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    The computational, i.e. architectural, algorithmic, and synchronization, issues related to competitive information integration in a distributed sensor network (DSN) are addressed. The proposed DSN architecture consists of a set of binary trees whose roots are fully connected. Each node of the tree has a processing element and one or more sensors associated with it. The information from each of the... View full abstract»

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  • Asymptotic error probability expressions for multihypothesis testing using multisensor data

    Publication Year: 1991, Page(s):1101 - 1114
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    Existing upper bounds to the error probability in testing between m>2 hypotheses, and H. Chernoff's (1952) asymptotically correct error probability expression for m=2 hypotheses, as the number of observations n→∞, are discussed. The multidimensional version of Chernoff's bound and its relationship to large deviation theory is presented. Large deviation theo... View full abstract»

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  • S-TRAINER: script based reasoning for mission assessment

    Publication Year: 1991, Page(s):1243 - 1251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    The design and implementation of script-based reasoning techniques integrated into a rule-based diagnoser for the purpose of debriefing air force pilots who have completed a bomber training mission are reported. The system was developed on a Symbolics Lisp Machine using Flavors and has the capability of reasoning about the tactical situations and providing plausible explanations of these activitie... View full abstract»

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  • Topological analysis of satellite-based distributed sensor networks

    Publication Year: 1991, Page(s):1060 - 1070
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    A method for evaluating the topological quality of networks for distributed sensor applications is presented. The criteria for evaluation are network survivability and delay. Nodal connectivity is used to characterize survivability, and mean path length is used to characterize delay. To calculate these two quantities, an algorithm is developed to find k shortest node-disjoint paths betwee... View full abstract»

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  • Automatic belief revision in a plausibility-driven design environment

    Publication Year: 1991, Page(s):933 - 951
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    Truth maintenance systems (TMSs) offer the most elaborate approach to the belief revision problem and are thus ideal candidates for automating belief revision during the course of plausibility-driven design evolution. However, the theory of plausible design (TPD) necessitates multivalued belief propagation while conventional TMSs are two-valued (IN/OUT) systems. Due to this mismatch, the encoding ... View full abstract»

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