This paper describes the motivations, approach, and architecture for using ontologies in knowledge extraction and in applications that assist situated agents in complex information integration tasks. Our approach applies ontologies along with semantic analysis methods to extract task relevant knowledge from distributed, unstructured text sources. This knowledge is then applied to assist in info...

Fixed step, symmetric Runge-Kutta-Nyström formulae have proved to be very efficient for the numerical integration of a large class of reversible second order systems of ordinary differential equations of the special form d 2y dt2 = f(t, y). However for some important classes of problems it is necessary, for the sake of efficiency, to allow a variable steplength of integration to be used and in ...

With today’s ever increasing demand for improved accuracy and faster material removal rates, CNC machine tool manufacturers and users are under pressure to supply and maintain machinery with a high degree of accuracy and performance. Although some machine tool users have their machines “checked”, there is no formal method of establishing the capability of a machine tool as an overall measure of...

By coupling the flexibility of Thin-Plate Splines interpolation with Green’s integral formula, we obtain a meshless cubature method from scattered samples of small/moderate size, on convex as well as nonconvex and even multiply connected polygonal domains. 2000 AMS subject classification: 65D05, 65D32.

Demographic and Health Survey (DHS) data could potentially inform optimal strategies to reach women having unmet need with contraceptive services through integrated service delivery. Using 2010-11 DHS data from Nepal, Senegal, and Uganda, we estimate the proportion of married or cohabitating women of reproductive age (MWRA) having unmet need for family planning (FP) who have accessed selected h...

The numerical integration of Hamiltonian systems is considered in this paper. Diagonally implicit Symplectic Runge-Kutta methods with special properties are presented. The methods developed have six and seven stages algebraic order up to 5th and dispersion order up to 8th.

Classical molecular dynamics simulation of a macromolecule requires the use of an eecient time-stepping scheme that can faithfully approximate the dynamics over many thousands of timesteps. Because these problems are highly nonlinear, accurate approximation of a particular solution trajectory on meaningful time intervals is neither obtainable nor desired, but some restrictions, such as symplect...

THEORY AND IMPLEMENTATION OF NUMERICAL METHODS BASED ON RUNGE-KUTTA INTEGRATION FOR SOLVING OPTIMAL CONTROL PROBLEMS