In this article, the authors introduce and study the performance of two novel parametric families of Nyquist intersymbol interference-free pulses. Using only two design parameters, the proposed pulses yield an enhanced performance compared to the sophisticated flipped-inverse hyperbolic secant (asech) filter, which was recently documented in the literature. Although the construction of parametr...

the main objective of this article is to optimize the walking pattern of a 2d humanoid robot with heel-off and toe-off motions in order to minimize the energy consumption and maximize the stability margin. to this end, at first, a gait planning method is introduced based on the ankle and hip joint position trajectories. then, using these trajectories and the inverse kinematics, the position tra...

An efficient iterative algorithm is applied to seek analytical solutions of higher dimensional initial boundary value problems (IBVPS) with variable coefficients. The proposed scheme finds the solution without any discretization, perturbation, transformation or restrictive assumptions and avoids the round off errors. Numerical results clearly reveal the complete reliability and efficiency of th...

Rounding error may totally corrupt the result of a oating point computation.How to improve and validate the accuracy of a oating point computation, without largecomputing time overheads ? We contribute to this question considering two examples:polynomial evaluation and linear triangular system solving. In both cases we use thecompensation of the rounding errors to improve the ac...

It is of utmost interest to control the divergence of the magnetic flux in simulations of the ideal magnetohydrodynamic equations since, in general, divergence errors tend to accumulate and render the schemes unstable. This paper presents a higher-order extension of the locally divergence-preserving procedure developed in Torrilhon [M. Torrilhon, Locally divergence-preserving upwind finite volu...

We compare two approaches for estimating the distribution of consumers’ willingness to pay (WTP) in discrete choice models. The usual procedure is to estimate the distribution of the utility coefficients and then derive the distribution of WTP, which is the ratio of coefficients. The alternative is to estimate the distribution of WTP directly. We apply both approaches to data on site choice in ...

Compact models of short channel effect in symmetric and asymmetric double gate MOSFETs are developed by solving two-dimensional (2-D) Poisson’s equation as a boundary value problem in the subthreshold region. The subthreshold current is obtained through the 2-D analytic potential distribution function. Threshold voltage rolloff, drain induced barrier lowering (DIBL) and subthreshold slope degra...

Rigorous bounds on rounding errors for sparse positive definite matrices are obtained. When used for nested dissection orderings of finite element matrices, the analysis furnishes bounds which are stronger than those for band orderings.

Copyright 2010 Northeastern Agricultural and Resource Economics Association It is especially important that researchers be cautious about presenting willingness to pay (WTP) point estimates to policy makers when the estimates are sensitive to subjective decisions that the researchers make during the estimation process. It is well known that WTP point estimates are sensitive to the choice regard...