William J. Wolfe

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This paper describes an online method of implementing student peer reviews. The results of applying the method to several courses is also discussed. Each week students accessed each others' assignments, as posted on individual web pages, and submitted scores and comments on the course web site. The course web site did all the bookkeeping, giving students(More)
A special class of mutually inhibitory networks is analyzed, and parameters for reliable K-winner performance are presented. The network dynamics are modeled using interactive activation, and results are compared with the sigmoid model. For equal external inputs, network parameters that select the units with the larger initial activations (the network(More)
A family of symmetric neural networks that solve a simple version of the assignment problem (AP) is analyzed. The authors analyze the suboptimal performance of these networks and compare the results to optimal answers obtained by linear programming techniques. They then use the interactive activation model to define the network dynamics-a model that is(More)
This article describes a Hopfield-Tank model of the Euclidean traveling salesman problem (using Aiyer's subspace approach) that incorporates a " fuzzy " interpretation of the rows of the activation array. This fuzzy approach is used to explain the network's behavior. The fuzzy interpretation consists of computing the center of mass of the positive(More)
One of the fundamental difficulties that arises when attempting to use computer vision in dynamic environments is that camera calibration coefficients must be adjusted as the relative distances between camera and target object change, causing refocusing to occur. Such situations arise frequently in robotic environments in which the visual sensor is mobile(More)
We introduce a generalization of mutually inhibitory networks called homogeneous networks. Such networks have symmetric connection strength matrices that are circulant (one-dimensional case) or block circulant with circulant blocks (two-dimensional case). Fourier harmonics provide universal eigenvectors, and we apply them to several homogeneous examples:(More)
OBJECTIVE This study examined routine computerized screening for alcohol and drug use of men and women seeking outpatient psychiatric services (excluding chemical dependency treatment) and prevalence based on electronic medical records of consecutive admissions. METHODS The sample of 422 patients, ages 18-91, completed a self-administered questionnaire.(More)
This paper presents a significant improvement to the traditional neural approach to the assignment problem (AP). The technique is based on identifying the feasible space (F) with a linear subspace of R(n(2)), and then analyzing the orthogonal projection onto F. The formula for the orthogonal projection is shown to be simple and easy to integrate into the(More)
Any use of trade, product, or firm name in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. TABLES 1. Physical, chemical, and biological properties of the chlorinated-solvent compounds which have helped lead to extensive groundwater contamination by this compound class Multiply By To obtain(More)