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.

Forecast errors in service systems

Abstract: We investigate the presence and impact of forecast errors in the arrival rate of customers to a service system. Analysis of a large dataset shows that forecast errors can be large relative to the fluctuations naturally expected in a Poisson process. We show that ignoring forecast errors typically leads to overestimates of performance and that forecast errors of the magnitude seen in our dataset can have a practically significant impact on predictions of long-run performance. We also define short-run performance as the random percentage of calls received in a particular period that are answered in a timely fashion. We prove a central limit theorem that yields a normal-mixture approximation for its distribution for Markovian queues and we sketch an argument that shows that a normal-mixture approximation should be valid in great generality. Our results provide motivation for studying staffing strategies that are more flexible than the fixed-level staffing rules traditionally studied in the literature.

The Interrogator model

Abstract: The Interrogator is a protocol security analysis tool implemented in Prolog and based on a communicating-machine message transformation model with message modification threats. It supports a large and extendible class of symbolic encryption and data transformation operators with a novel equation-solving approach in the context of equational theories. The operator representation and equation-solving capability has a simple interface to the protocol and threat model. >

A Low Q Electrically Small Magnetic (TE Mode) Dipole

Abstract: Electrically small antennas can be made to exhibit omnidirectional, dipole-like radiation patterns when operating in the transverse magnetic (electric dipole) mode, the transverse electric (magnetic dipole) mode or some combination of transverse magnetic (TM) and transverse electric (TE) mode radiation. When designing electrically small antennas whose performance properties closely approach theoretical limits, engineers generally focus on the design of electric dipoles or TM mode radiators. These radiators can be designed to exhibit low voltage standing wave ratio (VSWR), high radiation efficiency, and a low quality factor. TM mode radiators also have the advantage of a straightforward transition from the dipole to the monopole configuration for use over metallic ground planes or surfaces. Following our previous work in the design of small electric dipoles, we present the design of a new, electrically small magnetic dipole or TE mode radiator. This new design is shown to exhibit low VSWR, high radiation efficiency, and a low quality factor. We show that the quality factor of the magnetic dipole radiator approaches the lower bound (the Chu-limit) to within a ratio consistent with recent limits presented by Thal.

ANSI/IEEE 1471 and systems engineering

Abstract: ANSI/IEEE Standard 1471-2000 is the Recommended Practice for Architectural Description of Software-Intensive Systems, developed by the IEEE's Architecture Working Group (AWG) under the sponsorship of the Software Engineering Standards Committee of IEEE. ANSI/IEEE 1471-2000 is the first formal standard to address the content and organization of architectural descriptions. [A wide variety of architecture frameworks exist as de facto standards in particular communities, but ANSI/IEEE 1471 is the first formal standard in the sense of being a product formally approved by a recognized standards body.] The standard defines the structure and content of an Architectural Description (AD) and incorporates a broad consensus on best practices for such descriptions. Although ANSI/IEEE 1471-2000 was conceived as a software-focused standard, this article argues that it is equally applicable to any system; hence appropriate for use as a part of systems engineering to describe system architectures. This article reviews the concepts of ANSI/IEEE 1471-2000, the rationale for their selection, and demonstrates its application in systems engineering. © 2004 Wiley Periodicals, Inc. Syst Eng 7: 257–270, 2004