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.

IEEE 802.11 Wireless Local Area Networks

Abstract: The draft IEEE 802.11 wireless local area network (WLAN) specification is approaching completion. In this article, the IEEE 802.11 protocol is explained, with particular emphasis on the medium access control sublayer. Performance results are provided for packetized data and a combination of packetized data and voice over the WLAN. Our performance investigation reveals that an IEEE 802.11 network may be able to carry traffic with time-bounded requirements using the point coordination function. However, our findings suggest that packetized voice traffic must be handled in conjunction with an echo canceler.

Symmetry, Unitarity, and Geometry in Electromagnetic Scattering

Abstract: Upon defining vector spherical partial waves {${\mathbf{\ensuremath{\Psi}}}_{n}$} as a basis, a matrix equation is derived describing scattering for general incidence on objects of arbitrary shape. With no losses present, the scattering matrix is then obtained in the symmetric, unitary form $S=\ensuremath{-}{\stackrel{^}{Q}}^{\ensuremath{'}*}{\stackrel{^}{Q}}^{*}$, where (perfect conductor) $\stackrel{^}{Q}$ is the Schmidt orthogonalization of ${Q}_{n{n}^{\ensuremath{'}}}=(\frac{k}{\ensuremath{\pi}})\ensuremath{\int}d\mathbf{\ensuremath{\sigma}}\ifmmode\cdot\else\textperiodcentered\fi{}[(\ensuremath{ abla}\ifmmode\times\else\texttimes\fi{}\mathrm{Re}{\mathbf{\ensuremath{\Psi}}}_{n})\ifmmode\times\else\texttimes\fi{}{\mathbf{\ensuremath{\Psi}}}_{{n}^{\ensuremath{'}}}]$, integration extending over the object surface. For quadric (separable) surfaces, $Q$ itself becomes symmetric, effecting considerable simplification. A secular equation is given for constructing eigenfunctions of general objects. Finally, numerical results are presented and compared with experimental measurements.

AntiPatterns: Refactoring Software, Architectures, and Projects in Crisis

Abstract: If patterns are good ideas that can be re-applied to new situations, AntiPatterns: Refactoring Software, Architectures, and Projects in Crisis looks at what goes wrong in software development, time and time again. This entertaining and often enlightening text defines what seasoned developers have long suspected: despite advances in software engineering, most software projects still fail to meet expectations--and about a third are cancelled altogether. The authors of AntiPatterns draw on extensive industry experience, their own and others, to help define what's wrong with software development today. They outline reasons why problem patterns develop (such as sloth, avarice, and greed) and proceed to outline several dozen patterns that can give you headaches or worse. Their deadliest hit list begins with the Blob, where one object does most of the work in a project, and Continuous Obsolescence, where technology changes so quickly that developers can't keep up. Some of the more entertaining antipatterns include the Poltergeist (where do-nothing classes add unnecessary overhead), the Boat Anchor (a white elephant piece of hardware or software bought at great cost) and the Golden Hammer (a single technology that is used for every conceivable programming problem). The authors then proceed to define antipatterns oriented toward management problems with software (including Death by Planning and Project Mismanagement, along with several miniature antipatterns, that help define why so many software projects are late and overbudget). The authors use several big vendors' technologies as examples of today's antipatterns. Luckily, they suggest ways to overcome antipatterns and improve software productivity in "refactored solutions" that can overcome some of these obstacles. However, this is a realistic book, a mix of "Dilbert" and software engineering. A clever antidote to getting too optimistic about software development, AntiPatterns should be required reading for any manager facing a large-scale development project. --Richard Dragan

A model-theoretic coreference scoring scheme

Abstract: This note describes a scoring scheme for the coreference task in MUC6 It improves on the original approach by: (1) grounding the scoring scheme in terms of a model; (2) producing more intuitive recall and precision scores; and (3) not requiring explicit computation of the transitive closure of coreference The principal conceptual difference is that we have moved from a syntactic scoring model based on following coreference links to an approach defined by the model theory of those links

SAR imaging of moving targets

Abstract: A method of forming synthetic aperture radar (SAR) images of moving targets without using any specific knowledge of the target motion is presented. The new method uses a unique processing kernel that involves a one-dimensional interpolation of the deramped phase history which we call keystone formatting. This preprocessing simultaneously eliminates the effects of linear range migration for all moving targets regardless of their unknown velocity. Step two of the moving target imaging technique involves a two-dimensional focusing of the movers to remove residual quadratic range migration errors. The third and last step removes cubic and higher order defocusing terms. This imaging technique is demonstrated using SAR data collected as part of DARPA's Moving Target Exploitation (MTE) program.