Mitre Corporation

About: Mitre Corporation is a company organization based out in Bedford, Massachusetts, United States. It is known for research contribution in the topics: Air traffic control & National Airspace System. The organization has 4884 authors who have published 6053 publications receiving 124808 citations. The organization is also known as: Mitre & MITRE.

Using sample size to limit exposure to data mining

Abstract: Data mining introduces new problems in database security. The basic problem of using non-sensitive data to infer sensitive data is made more difficult by the "probabilistic" inferences possible with data mining. This paper shows how lower bounds from pattern recognition theory can be used to determine sample sizes where data mining tools cannot obtain reliable results.

180 degrees lumped element hybrid

Abstract: A technique for the design of 180 degrees lumped-element hybrids is described which yields electrical performance comparable to the transmission line version but takes up significantly smaller area of GaAs. Broader bandwidth can be obtained by cascading two lumped-element sections. This technique is applicable to other distributed devices such as the 90 degrees branch-line hybrid and the Wilkinson power divider. The layout of an actual hybrid designed for a center frequency of 7.95 GHz is shown. >

Aspects of rhythm in gesture and speech

Abstract: This article investigates the rhythmic relationship between gesture and speech. Four subjects were filmed in natural conversations with friends. From the resulting videos, several thousand time-stamped annotations pertaining to rhythm were manually recorded in a digital annotation tool, and exported for statistical analysis. They revealed a rich rhythmic relationship between the hands, head, and voice. Each articulator produced pikes (a general term for short, distinctive expressions, regardless of the modality) in complex synchrony with other articulators. Even eyeblinks were synchronized, with eyelids held closed until reopening on the rhythmic beat, akin to a pre-stroke hold before a gestural stroke. Average tempos similar to previously reported natural human tempos — e.g. Fraisse’s (1982) 600 ms figure — were found in hands, head, and speech, although hands tended to move most quickly and speech most slowly. All three also shared a common tempo of around a third of a second, perhaps to synchronize inter-articulator meeting points. These findings lend empirical weight to earlier observations of a rhythmic relationship between gesture and speech, providing support for the theory of a common cognitive origin of the two modalities.

Diffraction-Limited Scalar Image Formation with Holograms of Arbitrary Shape

Abstract: A theory of image formation is presented for a large-angle, point reference hologram, whose recording arrangement consists of a surface of arbitrary shape, a point reference source, and the object. The hologram is illuminated by a spherical wave during reconstruction. The resulting image field is similar to that of a Fourier-transform hologram. An exact, integral formulation of monochromatic, scalar diffraction theory is used to find the image field. The hologram is modeled by surface sources determined from the irradiance of the recorded field. The image field produced by the holographic system approximates the field produced by the ideal system, which forms the image of a point object by launching a converging, spherical wave.