Raytheon

About: Raytheon is a company organization based out in Waltham, Massachusetts, United States. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 15290 authors who have published 18973 publications receiving 300052 citations.

The design and operation of cloudlab

Abstract: Given the highly empirical nature of research in cloud computing, networked systems, and related fields, testbeds play an important role in the research ecosystem. In this paper, we cover one such facility, CloudLab, which supports systems research by providing raw access to programmable hardware, enabling research at large scales, and creating a shared platform for repeatable research. We present our experiences designing CloudLab and operating it for four years, serving nearly 4,000 users who have run over 79,000 experiments on 2,250 servers, switches, and other pieces of datacenter equipment. From this experience, we draw lessons organized around two themes. The first set comes from analysis of data regarding the use of CloudLab: how users interact with it, what they use it for, and the implications for facility design and operation. Our second set of lessons comes from looking at the ways that algorithms used "under the hood," such as resource allocation, have important-- and sometimes unexpected--effects on user experience and behavior. These lessons can be of value to the designers and operators of IaaS facilities in general, systems testbeds in particular, and users who have a stake in understanding how these systems are built.

A History of Microwave Heating Applications

Abstract: The development of microwave heating applications is reviewed. This field has followed the earlier application of lower RF frequencies to induction and dielectric heating. Serious activity began after World War II, directed towards a microwave oven for commercial and residential use. The broadening of interest to include scientific and industrial applications followed in the early sixties as new markets for microwave power sources were sought. The creation of the International Microwave Power Institute was one result. The marketing of a countertop microwave oven for consumers gave birth to the economically important oven business in the sixties. The growth of this field has been marked, perhaps slowed, by a series of sociotechnical events questioning the safety of microwave exposure near high-power microwave systems. Although some of this has receded, a problem of public education remains for those who will expand this field. The future development of this field will exploit a broader number of operating frequencies and will be ultimately limited by environmental regulations related to electromagnetic compatibility (or RFl), rather than safe exposure of biological tissue.

Mapping the stellar structure of the milky way thick disk and halo using segue photometry

Abstract: We map the stellar structure of the Galactic thick disk and halo by applying color-magnitude diagram (CMD) fitting to photometric data from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey. The SEGUE imaging scans allow, for the first time, a comprehensive analysis of Milky Way structure at both high and low latitudes using uniform Sloan Digital Sky Survey photometry. Incorporating photometry of all relevant stars simultaneously, CMD fitting bypasses the need to choose single tracer populations. Using old stellar populations of differing metallicities as templates, we obtain a sparse three-dimensional map of the stellar mass distribution at |Z|>1?kpc. Fitting a smooth Milky Way model comprising exponential thin and thick disks and an axisymmetric power-law halo allows us to constrain the structural parameters of the thick disk and halo. The thick-disk scale height and length are well constrained at 0.75 ? 0.07?kpc and 4.1 ? 0.4?kpc, respectively. We find a stellar halo flattening within ~25?kpc of c/a = 0.88 ? 0.03 and a power-law index of 2.75 ? 0.07 (for 7?kpc RGC 30?kpc). The model fits yield thick-disk and stellar halo densities at the solar location of ?thick,? = 10?2.3?0.1 M ??pc?3 and ?halo,? = 10?4.20?0.05 M ??pc?3, averaging over any substructures. Our analysis provides the first clear in situ evidence for a radial metallicity gradient in the Milky Way's stellar halo: within R 15?kpc the stellar halo has a mean metallicity of [Fe/H] ?1.6, which shifts to [Fe/H] ?2.2 at larger radii, in line with the two-component halo deduced by Carollo et?al. from a local kinematic analysis. Subtraction of the best-fit smooth and symmetric model from the overall density maps reveals a wealth of substructures at all latitudes, some attributable to known streams and overdensities, and some new. A simple warp cannot account for the low latitude substructure, as overdensities occur simultaneously above and below the Galactic plane.

Distributed malware detection

Abstract: According to one embodiment, a computer-implemented method includes accessing, using one or more processing units, a first file of a plurality of files requested to be analyzed for malware. Each of the plurality of files corresponds to a respective remote client of a plurality of remote clients. Further, the method includes: processing, using the one or more processing units, an analysis of the first file for malware; and generating an output comprising an indication of whether the first file comprises malware. The method also includes accessing, using the one or more processing units, an address for a first remote client of the plurality of remote clients. The first remote client is the respective remote client corresponding to the first file. In addition, the method includes: sending, using the one or more processing units, the output in a communication addressed to the first remote client corresponding to the first file.