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.

Extracting the dark matter profile of a relaxed galaxy cluster

Abstract: Knowledge of the structure of galaxy clusters is essential for an understanding of large-scale structure in the universe and may provide important clues to the nature of dark matter. Moreover, the shape of the dark matter distribution in the cluster core may offer insight into the structure formation process. Unfortunately, cluster cores also tend to be the site of complicated astrophysics. X-ray imaging spectroscopy of relaxed clusters, a standard technique for mapping their dark matter distributions, is often complicated by the presence of cool components in cluster cores, and the dark matter profile one derives for a cluster is sensitive to assumptions made about the distribution of this component. In addition, fluctuations in the temperature measurements resulting from normal statistical variance can produce results that are unphysical. We present here a procedure for extracting the dark matter profile of a spherically symmetric, relaxed galaxy cluster that deals with both of these complications. We apply this technique to a sample of galaxy clusters observed with the Chandra X-Ray Observatory and comment on the resulting mass profiles. For some of the clusters we compare their masses with those derived from weak and strong gravitational measurements.

MPI/RT-an emerging standard for high-performance real-time systems

Abstract: The past few years saw an emergence of standardization activities for real-time systems including standardization of operating systems (series of POSIX standards), of communication for distributed (POSIX.21) and parallel systems (MPI/RT) and real-time object management (real-time CORBA). The article describes the ongoing work of real-time message passing interface (MPI/RT) standardization. MPI/RT advances the Message Passing Interface Standard (MPI), emphasizing changes that enable and support real-time communication, and is targeted for embedded, fault-tolerant and other real-time systems.

Design and implementation of HLA time management in the RTI version F.0

Abstract: The DoD High Level architecture (HLA) has recently become the required method for the interconnection of all DoD computer simulations. The HLA addresses the rules by which simulations are designed to facilitate interoperability, the method by which information exchanged between simulations is described, and a standard set of software services provided 5y a common Runtime Infrastructure (RTI). The RTI is responsible for the coordination of collections of cooperating simulations. The familiarization version of the RTI, dubbed F.0, was developed at the MITRE Corporation. One of the core components of the RTI is Time Management and is the focus of this paper. In particular, we present the design and algorithms used to implement the HLA Time Management Services in F.O.

Network Management in Emergency Response: Articulation Practices of State-Level Managers—Interweaving Up, Down, and Sideways

Abstract: Large-scale emergency response requires management of collaborative networks that stretch across government agencies and levels, and that include nonprofit and private organizations. Management of such collaborative networks has been recognized as a research area in need of further study. Inter-organizational complexities associated with these collaborative networks give rise to unanticipated contingencies that compound issues directly associated with an emergency itself. Planning for such response is therefore intrinsically limited, and emergency managers must bridge the gaps via articulation practices in real-time. In this paper, the authors draw on empirical data to develop a conceptual framework characterizing dimensions of inter-organizational complexity and domains of response coordination through which emergency managers articulate large-scale response efforts. The framework is illustrated with examples of state-level emergency managers articulating threads of networked response efforts concurrentl...