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  1. Only showing results from ieeexplore.ieee.org

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  2. ieeexplore.ieee.org

    This paper presents an extension of the Virtual Force Field (VFF) approach to solve the obstacle avoidance problem, which is fundamental for autonomous systems. In this approach, due to continuity, the future motions of the vehicle and dynamic obstacles are estimated based on polynomial extrapolation from their past movements and potential collisions are predicted. This method integrates and ...
  3. ieeexplore.ieee.org

    This paper presents the combination of Potential Flow Field (PFF) and Virtual Force Field (VFF) methods to construct a viable means for UAS's to autonomously navigate and avoid collisions with obstacles. A validated flight dynamics model of a fixed-wing UAS was integrated with a heading hold autopilot that receives commanded heading angles from the selected output of the PFF and VFF methods ...
    Author:Edward Burgos, Subodh BhandariPublished:2016
  4. ieeexplore.ieee.org

    A local navigation algorithm for mobile robots is proposed that combines rule-based and neural network approaches. First, the extended virtual force field (EVFF), an extension of the conventional virtual force field (VFF), implements a rule base under the potential field concept. Second, the neural network performs fusion of the three primitive behaviors generated by EVFF. Finally ...
    Author:Kwang-Young Im, Se-Young Oh, Seong-Joo HanPublished:2002
  5. ieeexplore.ieee.org

    Therefore, some new algorithms have been proposed to achieve the purpose of obstacle avoidance and navigation. This paper proposes a concise and stable obstacle avoidance method named VFHF which is based on the laser rangefinder and combines VFH and VFF to compensate for the close-distance obstacle avoidance which is a inherent defect of VFH.
  6. ieeexplore.ieee.org

    An FD-VFF-RLS equalization, a DSP algorithm, with fast tracking capability for MDM links is proposed. We show that its Q 2 factor has 4.5-dB gain compared with . Frequency-Domain VFF-RLS Equalization for the Time-Varying Mode-Division Multiplexed Channels Abstract: An FD-VFF-RLS equalization, a ...
  7. ieeexplore.ieee.org

    This paper presents a new methodology for multiscale strain simulations of semiconductor devices based on the valence force field (VFF) method and the finite element method (FEM). By coupling the atomistic and the continuum methods, only advantages such as the atomistic description and accuracy of the VFF method and the flexibility and numerical efficiency of the FEM can be obtained.
  8. ieeexplore.ieee.org

    We use retrospective cost adaptive control (RCAC) with a constant forgetting factor (CFF), variable forgetting factor (VFF), and Kalman Filter (KF) to control a planar missile with nonlinear dynamics and aerodynamics. RCAC/CFF, RCAC/VFF, and RCAC/KF are used within an inner-loop/outer-loop control architecture, where the normal acceleration command is used to update the pitch-rate command for ...
  9. ieeexplore.ieee.org

    The phase correlation method (PCM) is known to provide straightforward estimation of rigid translational motion between two images. It is often claimed that the original method is best suited to identify integer pixel displacements, which has prompted the development of numerous subpixel displacement identification methods. However, the fact that the phase correlation matrix is rank one for a ...
  10. ieeexplore.ieee.org

    We extend and optimize the axisymmetric 2.5-D eigensolver to calculate the far-field results of axisymmetric structures in stratified backgrounds (SBs), which is useful and practical for optical design and engineering. Two kinds of near-field-to-far-field transformations (NFFFTs) are proposed. One is called closed-surface transformation which is based on the dipole radiations in SBs. The other ...
  11. ieeexplore.ieee.org

    Accurate modeling of non-equilibrium heat transport in nanostructures demands an appropriate description of phonon dispersion relation and proper treatment of various anharmonic effects. In this work, we develop and employ a coupled VFF molecular mechanics-Monte Carlo (VFF-MC) platform to solve the phonon Boltzmann Transport Equation (BTE) for modeling thermal conductivity in nanostructures ...

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