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The 2-D Fourier transform analysis of multichannel signals is a straightforward method to extract the dispersion curves of guided modes. Basically, the time signals recorded at several positions along the waveguide are converted to the wavenumber-frequency space, so that the dispersion curves (i.e., the frequency-dependent wavenumbers) of the guided modes(More)
Ultrasonic guided waves have recently been used in fracture evaluation and fracture healing monitoring. An axial transmission technique has been used to quantify the impact of the gap breakage width and fracture angle on the amplitudes of low order guided wave modes S0 and A0 under a 100 kHz narrowband excitation. In our two dimensional finite-difference(More)
The purpose of this study was to understand the acoustic properties of human vertebral cancellous bone and to study the feasibility of ultrasound-based navigation for posterior pedicle screw fixation in spinal fusion surgery. Fourteen human vertebral specimens were disarticulated from seven un-embalmed cadavers (four males, three females, 73.14 ± 9.87(More)
This paper concerns on a two-machine flow-shop scheduling problem with controllable processing times modeled by a non-linear convex resource consumption function. The objective is to minimize the resource consumption that is needed to control the makespan not to exceed the given deadline. A tabu-search algorithm is designed, which searches for the optimal(More)
In this paper, we consider scheduling n jobs with arbitrary release dates and due dates on a single machine, where jobs' processing times can be controlled by the allocation of a common resource, and the operation is modeled by a non-linear convex resource consumption function. The objective is to obtain an optimal processing sequence as well as optimal(More)
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