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.

Rate 3/4 Convolutional Coding of 16-PSK: Code Design and Performance Study

Abstract: Convolutional coding coupled with 16-PSK modulation is investigated for bandwidth efficient transmission. Rate 3/4, small memory codes are found which are optimized in the free-distance sense on the Gaussian channel. These codes provide up to 4.8 dB of coding gain with 32 states over uncoded 8-PSK, a scheme having the same spectral efficiency as the codes described. The performance is compared with earlier findings of Ungerboeck and some recent results on R = 2/3 coded 8-PSK. In addition, we present results of a channel transmission study to assess the performance of the four-state code on the band-limited nonlinear channel, and find that performance of the coded scheme degrades comparably with uncoded 8-PSK, i.e., coding gain is roughly preserved.

Pagenumber of complete bipartite graphs

Abstract: Given an ordering of the vertices of a graph around a circle, a page is a collection of edges forming noncrossing chords. A book embedding is a circular permutation of the vertices together with a partition of the edges into pages. The pagenumber t(G) (also called book thickness) is the minimum number of pages in a book embedding of G. We present a general construction showing t(Km,n) ⩽ ⌈(m + 2n)/4⌉, which we conjecture optimal. We prove a result suggesting this is optimal for m ⩾ 2n − 3. For the most difficult case m = n, we consider vertex permutations that are regular, i.e., place vertices from each partite set into runs of equal size. Book embeddings with such orderings require ⌈(7n − 2)/9⌉ pages, which is achievable. The general construction uses fewer pages, but with an irregular ordering.

A framework for role-based specification and evaluation of awareness support in synchronous collaborative applications

Abstract: The contribution of the paper is a framework for specifying and evaluating awareness-related features of synchronous collaborative computing applications. While previous work acknowledges that roles are important to understanding awareness needs, no method has yet been developed to provide a fine-grained, role-based approach to both specifying the awareness-related characteristics of collaborative computing applications and evaluating whether the application meets the awareness requirements. We have been developing a means of specifying and evaluating awareness needs in synchronous collaborative systems based on the framework presented in the paper. We feel this framework can be used by other researchers, as well, to develop methods of specifying and evaluating the ability of collaborative applications to support awareness.

Segmentation, Content Extraction and Visualization of Broadcast News Video using Multistream Analysis

Abstract: This paper reports the development of a broadcast news video corpora and novel techniques to automatically segment stories, extract proper names, and visualize associated metadata We report story segmentation and proper name extraction results using an information retrieval inspired evaluation methodology, measuring the precision and recall performance of our techniques We briefly describe our implementation of a Broadcast News Analysis (BNA ’~) system and an associated viewer, Broadcast News Navigator (BNNTM) We point to current efforts toward more robust processing using multistream analysis on imagery, audio, and closed-caption streams and future efforts in automatic video summarization and user-tailored presentation generation

The aggregate level simulation protocol: an evolving system

Abstract: The aggregate level simulation protocol (ALSP) concept was initiated by ARPA in January 1990, the first laboratory demonstration took place in January 1991, and the first fielding in support of a major military exercise took place in July 1992. Since then, the ALSP confederation of models has grown from the original two members to six. In support of this growing confederation, the ALSP Infrastructure Software (AIS) has evolved from its fundamental functionality to the current focus on improved confederation management and performance. This paper describes the evolution of the AIS from the initial prototype to the present, emphasizing the discovery of new requirements and how they were accommodated.