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.

Graphical user interface for an enterprise intrusion detection system

Abstract: A method for interfacing with a user of an enterprise intrusion detection system, the method comprises receiving at least one packet flow, each packet flow originating from a unique node in the intrusion detection system and comprising descriptive information and a plurality of packet headers. The descriptive information of a first subset of the received packet flows is communicated to a user based at least in part on a filtering ruleset. A second subset of the received packet flows is concealed from the user based at least in part on the filtering ruleset. In response to receiving a command from the user, the plurality of packet headers for at least one packet flow in the first subset is communicated to the user.

A Blackboard Architecture for Integrating Process Planning and Production Scheduling

Abstract: As companies attempt to increase customization levels in their product offerings, move toward smaller lot production, and experi ment with more flexible customer/supplier arrangements such as those made possible by electronic data interchange (EDI), they increas ingly require the ability to (1) respond quickly, accurately, and competitively to customer requests for bids on new or modified products and (2) efficiently work out supplier/subcontractor arrangements for these products This in turn requires the ability to (1) rapidly convert standard-based product specifications into process plans and (2) quickly integrate process plans for new orders into the existing production schedule to best accommodate the current state of the manufacturing enterprise

Leo P: An Unquenched Very Low-Mass Galaxy

Abstract: Leo P is a low-luminosity dwarf galaxy discovered through the blind HI Arecibo Legacy Fast ALFA (ALFALFA) survey. The HI and follow-up optical observations have shown that Leo P is a gas-rich dwarf galaxy with active star formation, an underlying older population, and an extremely low oxygen abundance. We have obtained optical imaging with the Hubble Space Telescope to two magnitudes below the red clump in order to study the evolution of Leo P. We refine the distance measurement to Leo P to be 1.62+/-0.15 Mpc, based on the luminosity of the horizontal branch stars and 10 newly identified RR Lyrae candidates. This places the galaxy at the edge of the Local Group, ~0.4 Mpc from Sextans B, the nearest galaxy in the NGC 3109 association of dwarf galaxies of which Leo P is clearly a member. The star responsible for ionizing the HII region is most likely an O7V or O8V spectral type, with a stellar mass >25 Msun. The presence of this star provides observational evidence that massive stars at the upper-end of the initial mass function are capable of being formed at star formation rates as low as ~10^-5 Msun/yr. The best-fitting star formation history derived from the resolved stellar populations of Leo P using the latest PARSEC models shows a relatively constant star formation rate over the lifetime of the galaxy. The modeled luminosity characteristics of Leo P at early times are consistent with low-luminosity dSph Milky Way satellites, suggesting that Leo P is what a low-mass dSph would look like if it evolved in isolation and retained its gas. Despite the very low mass of Leo P, the imprint of reionization on its star formation history is subtle at best, and consistent with being totally negligible. The isolation of Leo P, and the total quenching of star formation of Milky Way satellites of similar mass, implies that local environment dominates the quenching of the Milky Way satellites.

Subsurface radiating dipole

Abstract: A system for in situ heating of oil shale by radiating electromagnetic wave energy from a dipole radiator positioned beneath an overburden in a body of oil shale. Radio frequency power is supplied from the surface through a transmission line to the radiator dipoles whose diameters are substantially greater than the spacing between the transmission line conductors. The dipole radiator is center fed by the transmission line through a reentrant choke structure substantially filled with a solid dielectric medium and concentric with one of said dipole elements.

The ISLAndS project II: The Lifetime Star Formation Histories of Six Andromeda dSphs

Abstract: The Initial Star formation and Lifetimes of Andromeda Satellites (ISLAndS) project uses Hubble Space Telescope imaging to study a representative sample of six Andromeda dSph satellite companion galaxies. The main goal of the program is to determine whether the star formation histories (SFHs) of the Andromeda dSph satellites demonstrate significant statistical differences from those of the Milky Way, which may be attributable to the different properties of their local environments. Our observations reach the oldest main sequence turn-offs, allowing a time resolution at the oldest ages of ~ 1 Gyr, which is comparable to the best achievable resolution in the MW satellites. We find that the six dSphs present a variety of SFHs that are not strictly correlated with luminosity or present distance from M31. Specifically, we find a significant range in quenching times (lookback times from 9 to 6 Gyr), but with all quenching times more than ~ 6 Gyr ago. In agreement with observations of Milky Way companions of similar mass, there is no evidence of complete quenching of star formation by the cosmic UV background responsible for reionization, but the possibility of a degree of quenching at reionization cannot be ruled out. We do not find significant differences between the SFHs of the three members of the vast, thin plane of satellites and the three off-plane dSphs. The primary difference between the SFHs of the ISLAndS dSphs and Milky Way dSph companions of similar luminosities and host distances is the absence of very late quenching (< 5 Gyr ago) dSphs in the ISLAndS sample. Thus, models that can reproduce satellite populations with and without late quenching satellites will be of extreme interest.