The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform

Leang S. Shieh - One of the best experts on this subject based on the ideXlab platform.

  • Model conversion and digital redesign of singular Systems
    Journal of the Franklin Institute, 1993
    Co-Authors: Jason Sheng Horng Tsai, Chu-tong Wang, Leang S. Shieh
    Abstract:

    Abstract Design procedures are proposed for model conversion and digital redesign of a singular System, which is controllable at finite and impulsive modes. In order to attain a standard regular problem, we use some techniques to decompose the singular System into a reduced-order regular subSystem and a nondynamic subSystem. As a result, some well-known design methodologies for a regular System can be applied to the reduced-order regular subSystem. Finally, we transform the results obtained back to those of the Original Coordinate System.

  • Model Conversion and Digital Redesign for Singular Systems
    1993 American Control Conference, 1993
    Co-Authors: Jason Sheng-hong Tsai, Chu-tong Wang, Leang S. Shieh
    Abstract:

    In this paper, we propose the design procedures for model conversion and digital redesign of a singular System, which is controllable at finite and impulsive modes. In order to attain a standard regular problem, we use some techniques to decompose the singular System into a reduced-order regular and nondynamic subSystem. As a result, some well-known design methodologies for a regular System can be applied to the reduced-order regular subSystem. Finally, we transform the results obtained back to those of the Original Coordinate System.

Guo-xiang Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Shear piezoelectric properties d24 and k24 of a [001] poled KNNTL-Mn single crystal
    CrystEngComm, 2019
    Co-Authors: Guo-xiang Zhou
    Abstract:

    The distributions of d24 and k24 in the 3D space of a [001] poled (K, Na, Li)(Na, Ta)O3:Mn (KNNTL-Mn) single crystal were investigated by the Coordinate System rotation method. For the [001] poled KNNTL-Mn single crystal, the maximum piezoelectric strain constant d24 was 607.4 pC N−1, which was 9.2 times larger than the value in the Original Coordinate System and higher than d33. The maximum electromechanical coupling coefficient k24 was 0.83, which was 2.7 times larger than the Original one. It was found that d24 and d15 as well as k24 and k15 were only equal in the Z-axis direction. In the other directions, d24 and k24 were greater than d15 and k15, respectively. In addition, compared with the 24-shear modes of other four lead-free single crystals (KNN, KNNT, KNNTL, and NBBT95/5) and the PZT-5H piezoelectric ceramics, the 24-shear mode of the KNNTL-Mn single crystals was found to be optimal in the lead-free single crystals. Although the maximum d24 of the KNNTL-Mn single crystal was slightly smaller than that of the PZT-5H piezoelectric ceramics, it was lead-free and had a larger electromechanical coupling coefficient, k24, and a higher Curie temperature than the PZT-5H piezoelectric ceramics. The [001] poled KNNTL-Mn single crystal is expected to be used in 24-shear mode piezoelectric sensors for non-destructive testing and structural health monitoring.

Jason Sheng Horng Tsai - One of the best experts on this subject based on the ideXlab platform.

  • Model conversion and digital redesign of singular Systems
    Journal of the Franklin Institute, 1993
    Co-Authors: Jason Sheng Horng Tsai, Chu-tong Wang, Leang S. Shieh
    Abstract:

    Abstract Design procedures are proposed for model conversion and digital redesign of a singular System, which is controllable at finite and impulsive modes. In order to attain a standard regular problem, we use some techniques to decompose the singular System into a reduced-order regular subSystem and a nondynamic subSystem. As a result, some well-known design methodologies for a regular System can be applied to the reduced-order regular subSystem. Finally, we transform the results obtained back to those of the Original Coordinate System.

D.a. Mendelsohn - One of the best experts on this subject based on the ideXlab platform.

  • Effect of fracture surface roughness on shear crack growth. Progress report, August 1, 1991--May 31, 1992
    1992
    Co-Authors: T.s. Gross, D.w. Watt, D.a. Mendelsohn
    Abstract:

    A model of fracture surface interference for Mode I fatigue crack profiles was developed and evaluated. Force required to open the crack faces is estimated from point contact expressions for Mode I stress intensity factor. Force transfer across contacting asperities is estimated and used to calculate Mode II resistance stress intensity factor (applied factor is sum of effective and resistance factors). Electro-optic holographic interferometry was used to measure 3-D displacement field around a Mode I fatigue pre-crack in Al loaded in Mode II shear. Induced Mode I crack face displacements were greater than Mode II displacements. Plane stress shear lip caused displacement normal to surface as the crack faces are displaced. Algorithms are being developed to track the displacements associated with the Original Coordinate System in the camera. A 2-D boundary element method code for mixed mode I and II loading of a rough crack (sawtooth asperity model) has been completed. Addition of small-scale crack tip yielding and a wear model are completed and underway, respectively.

  • Effect of fracture surface roughness on shear crack growth
    1992
    Co-Authors: T.s. Gross, D.w. Watt, D.a. Mendelsohn
    Abstract:

    A model of fracture surface interference for Mode I fatigue crack profiles was developed and evaluated. Force required to open the crack faces is estimated from point contact expressions for Mode I stress intensity factor. Force transfer across contacting asperities is estimated and used to calculate Mode II resistance stress intensity factor (applied factor is sum of effective and resistance factors). Electro-optic holographic interferometry was used to measure 3-D displacement field around a Mode I fatigue pre-crack in Al loaded in Mode II shear. Induced Mode I crack face displacements were greater than Mode II displacements. Plane stress shear lip caused displacement normal to surface as the crack faces are displaced. Algorithms are being developed to track the displacements associated with the Original Coordinate System in the camera. A 2-D boundary element method code for mixed mode I and II loading of a rough crack (sawtooth asperity model) has been completed. Addition of small-scale crack tip yielding and a wear model are completed and underway, respectively.

Hongmin Deng - One of the best experts on this subject based on the ideXlab platform.

  • A Multi-Feature Representation of Skeleton Sequences for Human Interaction Recognition
    Electronics, 2020
    Co-Authors: Xiaohang Wang, Hongmin Deng
    Abstract:

    Inspired from the promising performances achieved by recurrent neural networks (RNN) and convolutional neural networks (CNN) in action recognition based on skeleton, this paper presents a deep network structure which combines both CNN for classification and RNN to achieve attention mechanism for human interaction recognition. Specifically, the attention module in this structure is utilized to give various levels of attention to various frames by different weights, and the CNN is employed to extract the high-level spatial and temporal information of skeleton data. These two modules seamlessly form a single network architecture. In addition, to eliminate the impact of different locations and orientations, a Coordinate transformation is conducted from the Original Coordinate System to the human-centric Coordinate System. Furthermore, three different features are extracted from the skeleton data as the inputs of three subnetworks, respectively. Eventually, these subnetworks fed with different features are fused as an integrated network. The experimental result shows the validity of the proposed approach on two widely used human interaction datasets.