Author: SRI International

  • The Logical Foundations Of Evidential Reasoning

    The approach proposed by Carnap for the development of logical bases for probability theory is investigated by using formal structures that are based on epistemic logics. Epistemic logics are modal logics introduced to deal with issues that are relevant to the state of knowledge that rational agents have about the real world. The use of…

  • Inferring Domain Plans In Question-Answering

    The importance of plan inference in models of conversation has been widely noted in the com-putational-linguistics literature, and its incorporation in question-answering systems has enabled a range of cooperative behaviors. The plan inference process in each of these systems, however, has assumed that the questioner (Q), whose plan is being inferred, and the respondent (R),…

  • Epipolar-Plane Image Analysis: A Technique For Analyzing Motion Sequences

    A technique for unifying spatial and temporal analysis of an image sequence taken by a camera moving in a straight line is presented. The technique is based on a “dense” sequence of images–images taken close enough together to form a solid block of data. Slices of this solid directly encode changes due to motion of…

  • An Algorithm For Generating Quantifier Scopings

    The syntactic structure of a sentence often manifests quite clearly the predicate-argument structure and relations of grammatical subordination. But scope dependencies are not so transparent. As a result, many systems for representing the semantics of sentences have ignored scoping or generated scopings with mechanisms that have often been inexplicit as to the range of scopings…

  • An Architecture For Intelligent Reactive Systems

    Any intelligent system that operates in a moderately complex or unpredictable environment must be reactive — that is, it must respond dynamically to changes in its environment. A robot that blindly follows a program or plan without verifying that its operations are having their intended effects is not reactive. For simple tasks in carefully engineered…

  • Shading Into Texture

    The fractal surface model provides a formalism that is competent to describe such natural 3-D surfaces and, in addition, is able to predict human perceptual judgments of smoothness versus roughness.

  • A Morphological Recognizer With Syntactic and Phonological Rules

    This paper describes a morphological analyzer which, when parsing a word, uses two sets of rules: describing the syntax of words, and rules describing facts about orthography.

  • Stereo Integral Equation

    A new approach to the formulation and solution of the problem of recovering scene topography from a stereo image pair is presented.

  • Commonsense Metaphysics and Lexical Semantics

    In the TACITUS project for using commonsense knowledge in the understanding of texts about mechanical devices and their failures, we have been developing various commonsense theories that are needed to mediate between the way we talk about the behavior of such devices and causal models of their operation.

  • A Model Of Plan Inference That Distinguishes Between The Beliefs of Actors and Observers

    I describe a model of PI that rests on an analysis of plans as mental phenomena. I show that the content of an appropriate response to a query is affected by the types of any such discrepancies of belief judged to be present in the plan inferred to underlie that query.

  • High-Level Planning In A Mobile Robot Domain

    The bulk of the paper presents both problems encountered during the process of encoding this domain, and extensions of the planning system that were made to solve them.

  • A Simple Reconstruction Of GPSG

    Like most linguistic theories, the theory of generalized phrase structure grammar (GPSG) has described language axiomatically, that is, as a set of universal and language-specific constraints on the well-formedness of linguistic elements of some sort.