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- Hatem Khalil, Leon S. Levy
- SGCS
- 1978

Computer science is a young field whic h is undergoing rapid change compared t o more established academic disciplines . This movement has led to a variety o f curricular approaches . Moreover, th e different environments in which compute r science has grown up . and the sundr y research interests of faculties ha s encouraged different courses of study .… (More)

- M. El Bardini, H. M. Khalil, N. El Rabie, M. Sharaf
- 2009 International Conference on Computer…
- 2009

Least squares support vector machines (LS-SVM) based on a group of different kernel functions (Linear-Polynomial-Radial Basis Function- Exponential Radial Basis Function) for modeling nonlinear systems is introduced in this paper. A method for selecting the hyperparameters of LS-SVM is presented in details for both the regularization parameter (γ)… (More)

- Dana L. Ulery, Hatem M. Khalil
- Comput. J.
- 1974

- William E. Davis, Hatem M. Khalil
- SGNM
- 1972

POFF computes the probability of F values no greater than some assigned value. The method of evaluation is based on expressing the probability function in a simple algebraic form which is evaluated as a nested polynomial. In this respect it differs from Algorithm 322 [1] which computes the same function by recurrences. A comparison of their efficiency shows… (More)

- Dana L. Ulery, Hatem M. Khalil
- SYMSACC
- 1976

Symbolic computation has been used to generate classes of numeric algorithms for solving linear partial differential equations A two-phase procedure is described for automatically producing multiparameter families of difference approximations to the heat operator. In the first phase, a truncated series expansion is used to form the appropriate difference… (More)

- M. Andrews, Stephen F. McCormick, +4 authors James E. Kalan
- ACM Annual Conference
- 1976

This session includes three papers related to the development of algorithms for mathematical software. The first paper reports on efforts to develop software for evaluation of the square root function in microprocessors utilizing fixed point computation. The second describes the use of a simple Fortran precompiler which facilitates the use of a mathematical… (More)

- Hatem M. Khalil, Dana L. Ulery
- EUROSAM
- 1979

- Hatem M. Khalil
- Commun. ACM
- 1972

Let M be a square matrix of order Nn. Partition M into N 2 square matrices M(A, B), 1 < A, B < N, of order n; and let M(A, B; i , j ) , 1 < i,j < n, denote the element in the ith row and j th column o f M ( A , B). In general, for large values of Nn the problem of determining the eigenvalues and eigenvectors can only be solved by extensive calculation. For… (More)

- Hatem M. Khalil, Dana L. Ulery
- ACM Annual Conference
- 1976

We review current work in analytic computational complexity of sequential algorithms for partial differential equations. Included are studies which analyze and compare classes of algorithms for hyperbolic, elliptic and parabolic problems. Emphasis is on the criteria and techniques used to perform the analysis and comparisons.

- Hatem M. Khalil, Dana L. Ulery
- Comput. J.
- 1974

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