1,721,268 research outputs found
An expert system for the diagnosis of vehicle malfunctions.
Full text linkNANAhttp://archive.org/details/anexpertsystemfo109452226
A decision support system for the diagnosis of aircraft emergencies
Full text linkNAhttp://archive.org/details/adecisionsupport109452176
Optimal three-dimensional path planning using visibility constraints
Full text linkDistinguished Alumni Award Program author. Rear Admiral David H. Lewis, U.S. Navy, Commander, Space and Naval Warfare Systems Command (SPAWAR). (Presented 25 March 2015)We present an algorithm for finding optimal three- dimensional paths above polyhedral models of terrain. Airspace is modeled as irregularly-shaped regions of
homogeneous probability-of-detection, with respect to one or more fixed observers. We plan paths by first finding an optimal set of contiguous visibility regions, then an optimal piecewise-linear flight path through this envelope, using Snell's Law to find locally-optimal maneuver points. The performance of our region-finding algorithm favorably compares with an alternate approach using regular cubic regions.http://archive.org/details/optimalthreedime109452333
Three algorithms for planar-patch terrain modeling.
Full text linkProviding a simplified model of real terrain has applications to route planning for robotic vehicles and military maneuvers. In this thesis I explore planar-patch surface modeling to represent terrain in a simple and effective way. In planar-patch surface modeling the terrain is subdivided into a set of planar subregions. The homogeneity of the gradient within a planar subregion simplifies calculating the cost of traversing the region, thus simplifying route planning. I have explored three main strategies to model the surface: joint top-down and and bottom-up, strict bottom-up, and presmoothing bottom-up approaches. Results of the algorithms are shown graphically by using the APL and Grafstat packages, verifying their correctness and accuracy.http://archive.org/details/threelgorithmsfo109452313
Determining the location of an observer with respect to aerial photographs.
Full text linkhttp://archive.org/details/determininglocat109452301
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A program for scheduling a Patrol Air Wing training plan.
Full text linkThis research examined the feasibility of a computerized scheduling system to assist
the development of an annual training plan for a Patrol Air Wing. A prototype is
proposed incorporating a modified A* search control structure to handle the
combinatorial part of the problem. The system uses a pre-existing file for its database
and is implemented on an ISI workstation using the Prolog computer language.
Comparisons with a manual derivation of the training plan are made and analysis of the
prototype results with the pruning variable at several levels is performed.Approved for public release; distribution is unlimited.Lieutenant Commander, United States Navyhttp://archive.org/details/aprogramforsched109452336
Computer-aided recognition of man-made structures in aerial photographs
Full text linkAerial image acquisition systems are producing more data than can be analyzed by human experts. Most of the images produced by remote sensing satellites, including military ones, never get seen or inspected. In this work, automated detection and recognition of buildings in aerial photos is explored. Connectivity analysis is performed on graphs derived from line segment representations of the original images, obtained with the use of the Radon Transform. The model is experimentally validated using 2-meter panchromatic aerial photographs from the National Aerial Photography Program (NAPP), which provide a marginally adequate resolution for the recognition of small buildings.Approved for public release; distribution is unlimited.Brazilian Navy author.http://archive.org/details/computeraidedrec109451341
Some links between turtle geometry and analytic geometry
Full text linkThe computer language Logo facilitates the teaching of analytic geometry and calculus from the notion of curvature, through its turtle geometry facility. The author provides some theoretical basis for finding turtle geometry equivalents of familiar curves in analytic geometry, and vice versa, by some simple methods apparently previously unnoticed. In particular, he studied turtle geometry programs where the curvature of a line is a trigonometric function of its orientation. (Author)Approved for public release; distribution is unlimited.Prepared for: Chief of Naval Researchhttp://archive.org/details/somelinksbetween00row
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