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Showing papers by "Eric Chu published in 2008"


Journal ArticleDOI
TL;DR: This paper reports on the successful application of the structure-preserving doubling algorithms which preserve the structure of the eigenvalue problem of vibration of fast trains.

48 citations


Journal ArticleDOI
TL;DR: The experimental results show that WRR-SCAN provides significantly better quality for real-time streams and yields considerably shorter response times for aperiodic jobs.
Abstract: A multimedia server requires a real-time disk-scheduling algorithm to deliver isochronous data for real-time streams. Traditional disk-scheduling algorithms focus on providing good quality in a best effort manner. In this paper, we propose a novel real-time disk-scheduling algorithm called WRR-SCAN (weighted-round-robin-SCAN) to provide quality guarantees for all in-service streams encoded at variable bit rates and bounded response times for aperiodic jobs. WRR-SCAN divides a real-time stream into guaranteed jobs and optional jobs. The admission control admits a stream as long as its guaranteed jobs are satisfied. Such a decision is made in 0(1) time as WRR-SCAN reserves a fixed weight for each stream. WRR-SCAN incorporates an aggressive policy to dynamically reclaim unused bandwidth during runtime. The reclaimed bandwidth is used to serve optional jobs or more aperiodic jobs. We conducted a set of simulations to compare WRR-SCAN with a set of referred disk-scheduling algorithms. The evaluations are conducted on a commonly used disk simulator with traces from a real multimedia server. The experimental results show that WRR-SCAN provides significantly better quality for real-time streams and yields considerably shorter response times for aperiodic jobs.

8 citations


Journal ArticleDOI
TL;DR: In this paper, an algorithm for the pole assignment problem for descriptor systems with proportional and derivative state feedback is proposed, making use of the Schur form and minimizing the departure from normality of the closed-loop poles by Newton's method.
Abstract: We propose an algorithm for the pole assignment problem for descriptor systems with proportional and derivative state feedback The algorithm is the first of its kind, making use of the Schur form and minimizing the departure from normality of the closed-loop poles by Newton’s method Three illustrative examples are given

4 citations


Journal ArticleDOI
TL;DR: In this article, the perturbation of palindromic eigenvalues and eigenvectors, in terms of general matrix polynomials, semi-Schur linearization, and differentiation, are discussed.
Abstract: We investigate the perturbation of the palindromic eigenvalue problem for the matrix quadratic $P(\lambda) \equiv \lambda^2 A_1^T + \lambda A_0 + A_1$, with $A_0,\, A_1 \in \cs^{n \times n}$ and $A_0^T = A_0$. The perturbation of palindromic eigenvalues and eigenvectors, in terms of general matrix polynomials, palindromic linearizations, (semi-Schur) anti-triangular canonical forms and differentiation, are discussed. doi:10.1017/S144618110800031X

2 citations


Journal ArticleDOI
TL;DR: In this paper, the authors link the well-established concept of joint spectrum with the interesting and practical periodic eigenvalue problems (PEVPs), and apply a Bauer-Fike perturbation theory, incorporating a Clifford algebra technique, for joint spectrum is applied to PEVPs.
Abstract: We shall link the well-established concept of joint spectrum with the interesting and practical periodic eigenvalue problems (PEVPs). A Bauer- Fike perturbation theory, incorporating a Clifford algebra technique, for joint spectrum is applied to PEVPs, producing new perturbation results.