For the past two decades, there has been increasing use of computers for the construction of experimental designs which are 'good' in some well-defined sense. This paper reviews and compares some well-known ex...
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For the past two decades, there has been increasing use of computers for the construction of experimental designs which are 'good' in some well-defined sense. This paper reviews and compares some well-known exchange algorithms for the construction of discrete D-optimal designs. An improved implementation of the Fedorov's exchange algorithms is suggested.
Many recent papers have revisited the use of pilot tone as a phase and amplitude reference for demodulation on fading channels. The receiver in a pilot-aided transmission system extracts the reference with a narrow-ba...
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Many recent papers have revisited the use of pilot tone as a phase and amplitude reference for demodulation on fading channels. The receiver in a pilot-aided transmission system extracts the reference with a narrow-band pilot filter. Its bandwidth has an optimum value that represents a trade-off between the amount of distortion and the amount of additive noise present in the Doppler-spread tone. Obviously, the optimum bandwidth varies with vehicle speed. This paper addresses the issue of adjusting the filter bandwidth as speed changes. A novel adaptation technique has been used here, whereby the receiver selects the optimum member from a precalculated bank of stored filters. This technique can provide a 1.0 dB improvement for a normalized Doppler frequency of 2%;up to 2.0 dB can be gained when operating at a lower Doppler frequency. The algorithm is found to be very robust, in the sense that self-noise and decision direction have little effects on its operation and the resulting bit error rate.
This paper is concerned with the dynamic merit of robot manipulators and method for the optimization of manipulator dynamics in the case of an extremely bad design, which can be put into three categories: 1. Accelerat...
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This paper is concerned with the dynamic merit of robot manipulators and method for the optimization of manipulator dynamics in the case of an extremely bad design, which can be put into three categories: 1. Acceleration performance: minimize 2. Velocity performance: minimize 3. Comprehensive performance: minimize , and are the dynamics indices of API, VPI and CD PI under various conditions respectively.
A new exchange algorithm for construction of 2mD‐optimal fractional factorial design (FFD) is devised. This exchange algorithm is a modification of the one due to Fedorov (1969, 1972) and is an improvement over simil...
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Some problems unique to the construction of N-point D-optimal designs on convex design spaces are considered. Multiple-point augmentation and exchange algorithms are shown to be more costly and less efficient than the...
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Some problems unique to the construction of N-point D-optimal designs on convex design spaces are considered. Multiple-point augmentation and exchange algorithms are shown to be more costly and less efficient than the analogous single-point procedures. Moreover, some recommendations for improving single-point methods are given. Finally, empirical evidence is found that supports the Galil and Kiefer option for constructing initial designs and Powell's optimization method for design augmentation.
Abstract: The paper is concerned with the Chebyshev approximation of decay-type functions $f(x)$ by interpolating rationals. The interpolating points are chosen to be the zeros of $f(x)$. Existence, uniqueness...
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Abstract: The paper is concerned with the Chebyshev approximation of decay-type functions $f(x)$ by interpolating rationals. The interpolating points are chosen to be the zeros of $f(x)$. Existence, uniqueness and characterization of best approximations are first shown. An exchange algorithm is then described for computing the best approximation.
An implementation of Stiefel's exchange algorithm for determining a Chebyshev solution to an overdetermined system of linear equations is presented that uses Gaussian LU decomposition with row interchanges. The im...
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