In this paper, a novel direction of arrival (DOA) estimation algorithm called the Toeplitz fourth order cumulants multiple signal classification method (TFOC-MUSIC) algorithm is proposed through combining a fast MUSIC-like algorithm termed the modified fourth order cumulants MUSIC (MFOC-MUSIC) algorithm and Toeplitz approximation. In the proposed algorithm, the redundant information in the cumu...

of Publications Social Sciences Public Administration and Local Government kkdkjd Christian Ezeibe Digitally Signed by: Chris Ezeibeme DN : CN = Webmaster’s name O= University of Nigeria, Nsukka OU = Innovation Centre BRIEFS ON SELECTED PUBLICATIONS AND CREATIVE WORKS: Books: Mainline Books Oguonu C.N & Anugwom E.E. (2006) Research Methods In Social Sciences, Fourth Dimension Publishers, Enugu

This is the fourth and last paper in a sequence on Krull dimension for limit groups, answering a question of Z. Sela. In it we finish the proof, analyzing limit groups obtained from other limit groups by adjoining roots. We generalize our work on Scott complexity and adjoining roots from the previous paper in the sequence to the category of limit groups.

Hilbert’s fourth problems asks to construct and study the geometries in which the straight line segment is the shortest connection between two points. In this paper the reader shall find an elementary introduction to the problem and its solutions in dimension two by Busemann, Pogorelov, and Ambartzumian. The relationship between integral geometry and inverse problems in variational calculus is ...

We present a method for computing the dimension of C 1 piecewise polynomials on a triangulated polygonal domain in the plane. Our results verify a conjecture of Strang in a large number of cases. For fourth{degree piecewise polynomials we deene, inductively, a nodal basis on quite general meshes.

We analyze a local discontinuous Galerkin (LDG) method for fourth-order time-dependent problems. Optimal error estimates are obtained in one dimension and in multi-dimensions for Cartesian and triangular meshes. We extend the analysis to higher even-order equations and the linearized CahnHilliard type equations. Numerical experiments are displayed to verify the theoretical results.

This article attempts to extract and integrate the knowledge generated by practitioners engaged in Corporate Entrepreneurship experiments. Relying on fifteen case studies, it identifies and discusses the three key dimensions of their “theory-of-action”: autonomy, motivation and resource discipline. It argues for the inclusion of a fourth dimension – institutionalization – if Corporate Entrepren...

We discuss the existence of de Sitter inflationary solutions for the string-inspired fourth-derivative gravity theories with dilaton field. We consider a space-time of arbitrary dimension D and an arbitrary parametrization of the target space metric. The specific features of the theory in dimension D = 4 and those of the special ghost-free parametrization of the metric are found. We also consid...

We study the well-posedness of Cauchy problem for the fourth order nonlinear Schrödinger equations i∂t u=−ε u+ 2u+ P (( ∂ x u ) |α| 2, ( ∂ x ū ) |α| 2 ) , t ∈R, x ∈Rn, where ε ∈ {−1,0,1}, n 2 denotes the spatial dimension and P(·) is a polynomial excluding constant and linear terms. © 2006 Elsevier Inc. All rights reserved.