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Climate change impacts tree species differentially by exerting unique pressures and altering their suitable habitats. We previously predicted these changes in suitable habitat for current and future climates using a species habitat model (DISTRIB) in the eastern United States. Based on the accuracy of the model, the species assemblages should eventually… (More)
A software package has been developed to solve efficiently the Sylvester-type matrix equation <italic>AXB<supscrpt>T</supscrpt></italic> + <italic>CXD<supscrpt>T</supscrpt></italic> = <italic>E</italic>. A transformation method is used which employs the QZ algorithm to structure the equation in such a way that it can be solved columnwise by a back… (More)
This paper documents a software package for solving the Sylvester matrix equation (1) <italic>AXB<supscrpt>T</supscrpt></italic> + <italic>CXD<supscrpt>T</supscrpt></italic> = <italic>e</italic> All quantities are real matrices; <italic>A</italic> and <italic>C</italic> are <italic>m</italic> x <italic>n</italic>; <italic>B</italic> and… (More)
A parallel algorithm for solving the algebraic Riccati equation is described and its performance on an Intel iPSC/d5 is reported. Three variations of the matrix sign function algorithm are compared. The best one showed efficiencies of about 60 percent on large problems.
This project explores a new mechanism for early detection of Internet disturbances, including both natural and malicious events. We used multiple hidden Markov models to analyze a type of global routing data called Border Gateway Protocol (BGP). Reasonably good discrimination was achieved between quiet periods and disturbances, and some discrimination was… (More)
 E C. FISHBURN, Correlation in partially ordered sets, Discrete Appl. Math., 39 (1992), pp. 173-191.  J. KAHNANDM. SAKs,Balancingposet extensions, Order, (1984), pp. 113-126.  R. E STANLEY, Two combinatorial applications of the Aleksandrov-Fenchel inequalities, J. Combin. Theory, A, 31 (1981), pp. 56-65.  Enumerative Combinatorics, Vol. I,… (More)
Because tests at Army Test and Evaluation Command (ATEC) ranges can often only be conducted under specific atmospheric conditions, climatologies of each range could be a very useful tool for long-range test planning. Such datasets can provide the probability density function of near-surface wind speed, percent cloud cover, temperature, precipitation,… (More)
We propose a set of educational competencies for a graduate minor in computational science. Our goal is to reach a consensus on topics that students must understand to successfully use petascale computing.
One of the keys to the future competitiveness of U. S. industry is the integration of modeling and simulation into the development, design, and manufacturing process. A related challenge is to retrain the current workforce in the use of computational modeling to enable its effective use in the workplace. We review our implementation of a new, computational… (More)