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Wei Hsiang Chou – One of the best experts on this subject based on the ideXlab platform.

  • Improved Approach for Determining Pile Length of Group Pile Using Complex Continuous Wavelet Transform
    Journal of Testing and Evaluation, 2018
    Co-Authors: Pei-hsun Tsai, Yu Zhang Yang, Wei Hsiang Chou

    Abstract:

    This paper investigates the integrity test ability of the sonic echo (SE) test by using a field constructed group pile foundation. Due to the energy reflected stress wave is generally faded with wave travel path for the testing of a pile with pile cap, a signal process techniques were generally used to enhance the signal interested. The purpose of this paper is to study an improved signal processing approach to detect the pile length of a pile with pile cap. This paper utilized the amplitude and phase message of complex continuous wavelet transform to determine pile length of pile foundations by analyzing the time-frequency-phase Angle Diagram in the different frequency band. Two- pile group and four-pile group pile were tested. Six piles with different types of defects were installed and tested to verify the proposed approach in this study. The results show that complex continuous wavelet transform is able not only to provide high-resolution results in different frequency bands but also to simplify the identification of the reflection of defects using 3D phase spectrogram. The location of reflected stress wave of pile toe can then be determined using phase Diagram.

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  • Evaluation of pile defects using complex continuous wavelet transform analysis
    NDT & E International, 2017
    Co-Authors: Yu Zhang Yang, Pei-hsun Tsai, Wei Hsiang Chou

    Abstract:

    Abstract In recent years, the technique of wavelet transform has been applied widely in signal processing in different fields, including non-destructive testing of pile foundations. However, it was used mostly in signal filtering and the analysis of time-frequency Diagram. This paper successfully utilized complex continuous wavelet transform to determine pile length and locations of defects on pile foundations by analyzing the time-frequency-phase Angle Diagram in different frequency band. Six piles with different types of defects were installed and tested to verify the proposed approach in this study. The results shows that complex continuous wavelet transform not only is able to provide high resolution results in different frequency bands, which is similar to that of continuous wavelet transform, but also simplifies the identification of the reflection of defects using 3D phase spectrogram. The location of defects can then be easily determined using phase Diagram under the corresponding specific frequency.

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Adrian Lees – One of the best experts on this subject based on the ideXlab platform.

  • an application of neural networks for distinguishing gait patterns on the basis of hip knee joint Angle Diagrams
    Gait & Posture, 1997
    Co-Authors: J G Barton, Adrian Lees

    Abstract:

    In this study neural networks were applied to perform automated diagnosis of gait patterns. The three conditions of gait used were normal gait, a simulation of leg length difference, and a simulation of leg weight difference. Kinematic temporal changes were recorded by an on-line motion recording system. Hip-knee joint Angle Diagrams were obtained from eight subjects under the three conditions. After pre-processing, the hip-knee joint Angle Diagrams were presented to neural networks, which learned to distinguish the three conditions. Subsequent to training, unknown gait patterns were presented to the neural networks, which assigned those patterns into the right class with a correct assignment ratio of 83.3%. The results suggest that neural networks could be applied successfully in the automated diagnosis of gait disorders in a clinical context. Keywork Gait analysis; Neural network; Automated diagnosis; AngleAngle Diagram

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Zdenek Svoboda – One of the best experts on this subject based on the ideXlab platform.

  • an evaluation method of complex movement of the arm during walking based on gyroscope data and Angle Angle Diagram
    International Conference on Telecommunications, 2015
    Co-Authors: Lenka Hanakova, Patrik Kutilek, Vladimir Socha, David Skoda, Peter Takac, Jakub Schlenker, Zdenek Svoboda

    Abstract:

    The article focuses on a technique of gyroscope data processing and quantifying movement patterns of upper limb during walking. Four cheap gyroscopes were used. Using a novel method based on the trajectory length obtained by plotting shoulder and elbow joint Angle vs. each other, provides information for a quantification of the complex arm movement as a whole in the sagittal plane. Two parameters for the evaluation of motion, the trajectory length (TL) and traditional range of motion (ROM), were used to analyze a simple rhythmical movement and identified application possibilities of the new parameter. The Pearsons correlation coefficient indicates very strong correlation between the TL and ROM (r>0.8) for both dominant and non-dominant upper limb. Also, the correlation between the body height and TL or ROM was studied. The correlation between the body height and TL or ROM was a negligible (r<0.2). This shows the versatility of the proposed parameter.

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  • TSP – An evaluation method of complex movement of the arm during walking based on gyroscope data and AngleAngle Diagram
    2015 38th International Conference on Telecommunications and Signal Processing (TSP), 2015
    Co-Authors: Lenka Hanakova, Patrik Kutilek, Vladimir Socha, David Skoda, Peter Takac, Jakub Schlenker, Zdenek Svoboda

    Abstract:

    The article focuses on a technique of gyroscope data processing and quantifying movement patterns of upper limb during walking. Four cheap gyroscopes were used. Using a novel method based on the trajectory length obtained by plotting shoulder and elbow joint Angle vs. each other, provides information for a quantification of the complex arm movement as a whole in the sagittal plane. Two parameters for the evaluation of motion, the trajectory length (TL) and traditional range of motion (ROM), were used to analyze a simple rhythmical movement and identified application possibilities of the new parameter. The Pearsons correlation coefficient indicates very strong correlation between the TL and ROM (r>0.8) for both dominant and non-dominant upper limb. Also, the correlation between the body height and TL or ROM was studied. The correlation between the body height and TL or ROM was a negligible (r

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  • Kinematic Quantification of Gait Asymmetry Based on Characteristics of AngleAngle Diagrams
    , 2014
    Co-Authors: Patrik Kutilek, Zdenek Svoboda, Vladimir Socha, Slavka Viteckova, Pavel Smrcka

    Abstract:

    Our work focuses on studying gait symmetry with the use of bilateral AngleAngle Diagrams. The geometric characteristics of AngleAngle Diagrams can be used to characterize gait, as well as, identify and quantify the associated gait asymmetry. The AngleAngle Diagrams were created for ten patients with leg length inequality (LLI), to quantify gait symmetry before and after an application of the heel lift. In order to quantify the symmetry of human walking, we have invented and used the characteristics of an AngleAngle Diagram, which represent the evolution of the two joint Angles, i.e. left and right knee Angles or left and right hip Angles. The novel methods are based on the area of the convex hull of the hip-hip Diagram or knee-knee Diagram, and can be used as an additional method for the determination of gait symmetry of the bipedal walking of human subjects or robots. Our method is not limited to gait studies, it can also be used to study arm swing symmetry.

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