854 research outputs found
In-Situ Dimensional Changes of Powder Injection Molded Compacts during Solvent Debinding
No full textSpectral Envelope Linear Predictive Analysis of Speech Based on the Spectral Autocorrelation
No full textDS_10.1177_0022034518811642 – Supplemental material for High-Frequency Ultrasound Imaging for Examination of Early Dental Caries
No full textSupplemental material, DS_10.1177_0022034518811642 for High-Frequency Ultrasound Imaging for Examination of Early Dental Caries by J. Kim, T.J. Shin, H.J. Kong, J.Y. Hwang and H.K. Hyun in Journal of Dental Research</p
A preliminary investion of high strength, lightweight concrete barriers with steel fibers
No full textA new distortion measure for spectral quantization based on the LSF intermodel interlacing property
No full textThe line spectral frequencies (LSFs) extracted from successive analysis orders are interlaced with each other. This intermodel interlacing property gives a new relationship between the closeness of LSFs and their spectral sensitivities, which motivates a new weighting function for LSF distortion measurement. By applying this new weighting function to LSF quantization, we have achieved a significantly better performance than the conventional heuristic weighting functions in both clean and noise environments. In addition, the proposed weighting function gives better performance than the weighting function based on a high-rate approximation (Gardner weighting (GW)) [W.R. Gardner, B.D. Rao, IEEE Trans. Speech Audio Processing 3 (5) (1995) 367] in noise environments while their performances are comparable in clean environments. Moreover, the complexity of the proposed weighting function is much lower than that of the GW function. (C) 2001 Elsevier Science B.V. All rights reserved.
Effect of processing route on microstructure and mechanical properties in single-roll angular-rolling
No full textThis paper reports the effect of the processing route on the microstructure and mechanical properties in the pure copper sheets processed by single-roll angular-rolling (SRAR). The SRAR process was repeated up to six passes in two processing routes, called routes A and C in equal-channel angular pressing. As the number of passes increased, the heterogeneous evolution of hardness and microstructural heterogeneities between the core and surface regions gradually became intensified in both processing routes. In particular, route A exhibited more prominent partial grain refinement and dislocation localization on the core region than route C. The finite element analysis revealed that the intense microstructural heterogeneities observed in route A were attributed to effective shear strain partitioning between the core and surface regions by the absence of redundant strain. On the other hand, route C induced reverse shearing and cancellation of shear strain over the entire thickness, leading to weak shear strain partitioning and delayed grain refinement. Ultimately, this work suggests that route A is the preferred option to manufacture reverse gradient structures in that the degree of shear strain partitioning and microstructural heterogeneity between the core and surface regions is more efficiently intensified with increasing the number of passes. © 2020 by the authors.11Ysciescopu
BANDWIDTH-POWER PERFORMANCE ANALYSIS OF MULTI-h PHASE-CODED MOD U LATIONS WITH ASYMMETRIC M0DULATlON INDICES
No full textMulti-h phase-coded modulation (MHPM) with asymmetric
modulation indices has recently been proposed and found to
be a bandwidth-efficient modulation scheme with attractive
improvements in error probability performance. This letter
analyses in detail the bandwidth-power performance of such
new schemes using the minimum Euclidean distances and the
averaged modulation index for three phase pulse functions
High-Frequency Ultrasound Imaging for Examination of Early Dental Caries
No full textThe extent of dental tissue destruction during the treatment of white spot lesions (WSLs) increases with the severity of the lesion. If the depth and shape of WSLs can be predicted with a noninvasive diagnostic method before dental caries treatment, more conservative interventions can be planned. Given the superiority of high-frequency ultrasound (HFUS) imaging in observing the internal structures of the body, the present study aimed to verify the possibility of HFUS imaging to examine the depth and shape of WSLs. We prepared tooth samples and developed a biomicroscopic system with a HFUS transducer to obtain images of normal and WSL regions. HFUS images were compared with conventional ultrasound images and micro–computed tomography images. HFUS distinctly differentiated demineralization within WSL and normal regions. WSL depth calculated in the micro–computed tomography image was similar to that in HFUS. This study revealed that HFUS imaging has the potential to detect early dental caries and offer information on the invasion depth of early dental caries quantitatively. © International & American Associations for Dental Research 2018.1
- …
