The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

E.j. Powers - One of the best experts on this subject based on the ideXlab platform.

  • A Digital Method of modeling two-input quadratic systems with general random inputs
    IEEE Transactions on Signal Processing, 1991
    Co-Authors: E.j. Powers, C.p. Ritz
    Abstract:

    A Digital Method of estimating linear and quadratic transfer functions of a two-input/multiple-output quadratically nonlinear system with general (i.e., non-Gaussian as well as Gaussian) random inputs is described. The approach is based on a frequency domain second-order Volterra functional series representation for a two-input/multiple-output system. Practical applications where it is important to have the capability to model dual-input nonlinear systems include: ground vibration tests of aircraft where two random exciting forces are applied in order to inject sufficient energy into all modes of the system; and experimental studies of transition to turbulence in fluids and plasmas, where the two inputs consist of two different velocity components, and plasma density and potential fluctuations, respectively. The approach described is being utilized to investigate such applications. >

  • ICASSP - Digital estimation of linear/Quadratic transfer functions with a general random input
    ICASSP '86. IEEE International Conference on Acoustics Speech and Signal Processing, 1
    Co-Authors: Kyoung Kim, E.j. Powers
    Abstract:

    A new Digital Method of estimating linear and quadratic transfer functions of a quadratic system with a general random input is presented. The feasibility of the technique is demonstrated by analyzing simulated data. It is also shown that considerable error occurs in estimating the transfer functions based on a Gaussian input assumption, when in fact the input is non-Gaussian.

  • Frequency domain modeling of dual-input/multiple-output quadratic systems with general random inputs
    1988. IEEE International Symposium on Circuits and Systems, 1
    Co-Authors: E.j. Powers, C.p. Ritz
    Abstract:

    A Digital Method of estimating linear and quadratic transfer functions of a dual-input/multiple-output quadratically nonlinear system with general random inputs is described. The approach is based on a frequency-domain second-order Volterra functional series representation for a dual-input/multiple-output system. The feasibility of the approach is demonstrated with the aid of a computer simulation for a known system. >

C.p. Ritz - One of the best experts on this subject based on the ideXlab platform.

  • A Digital Method of modeling two-input quadratic systems with general random inputs
    IEEE Transactions on Signal Processing, 1991
    Co-Authors: E.j. Powers, C.p. Ritz
    Abstract:

    A Digital Method of estimating linear and quadratic transfer functions of a two-input/multiple-output quadratically nonlinear system with general (i.e., non-Gaussian as well as Gaussian) random inputs is described. The approach is based on a frequency domain second-order Volterra functional series representation for a two-input/multiple-output system. Practical applications where it is important to have the capability to model dual-input nonlinear systems include: ground vibration tests of aircraft where two random exciting forces are applied in order to inject sufficient energy into all modes of the system; and experimental studies of transition to turbulence in fluids and plasmas, where the two inputs consist of two different velocity components, and plasma density and potential fluctuations, respectively. The approach described is being utilized to investigate such applications. >

  • Frequency domain modeling of dual-input/multiple-output quadratic systems with general random inputs
    1988. IEEE International Symposium on Circuits and Systems, 1
    Co-Authors: E.j. Powers, C.p. Ritz
    Abstract:

    A Digital Method of estimating linear and quadratic transfer functions of a dual-input/multiple-output quadratically nonlinear system with general random inputs is described. The approach is based on a frequency-domain second-order Volterra functional series representation for a dual-input/multiple-output system. The feasibility of the approach is demonstrated with the aid of a computer simulation for a known system. >

Kyoung Kim - One of the best experts on this subject based on the ideXlab platform.

Zheng Ran - One of the best experts on this subject based on the ideXlab platform.

  • Digital Method in diagnosis of war wound
    Journal of Traumatic Surgery, 2005
    Co-Authors: Zheng Ran
    Abstract:

    Objective To study the Digital Methods in diagnosis of war wound.Methods We convert the diagnosis of war wound into codes.Serial numbers from 1 to 8 mean the locations of war wound;those from 9 to16 represent the sorts of anatomical structure;those from 17 to 20 refer to the types of war wound;those from 21 to 26 imply the sorts of war wound and those from 27 to 28 mean the stages of severity of war trauma.Results More than 2000 kinds of wounds were classified and coded according to clinical diagnosis.Conclusion This kind of Digital Method is manageable,stable and reliable,and coincided with the code rule and information science.

Vanessa Paredes - One of the best experts on this subject based on the ideXlab platform.

  • Comparative study of reproducibility and accuracy in measuring mesiodistal tooth sizes using three different Methods: 2D Digital, 3D CBCT, and 3D CBCT segmented
    Oral Radiology, 2015
    Co-Authors: Yanira Hernandez, Jose Luis Gandia, Beatriz Tarazona, Natalia Zamora, Rosa Cibrian, Vanessa Paredes
    Abstract:

    Objectives To develop a 3D cone-beam computed tomography (CBCT) Method (CBCT Method) for determining tooth sizes and arch dimensions and to compare the accuracy and reproducibility of that Method with those of a previously described 3D segmented CBCT Method (CBCT seg. Method) and a 2D Digital Method. Methods Plaster study models and CBCT images were available for 34 patients. For the first Method, the plaster study casts were Digitalized and measured using the 2D Digital Method. For the second Method, CBCT seg. Method, the CBCT images were sent in DICOM format to InVivoDental^® Company for segmentation and conversion into three-dimensional images of the models. For the third Method, CBCT Method, axial cuts were performed on the CBCT images, and tooth sizes and arch dimensions were measured using Anatomage^® software. Results Significant differences were found between the tooth size measurements obtained with the 3D CBCT Method and the 2D Digital Method, but not for the intercanine width, intermolar width, and arch length. There were no significant differences between the measurements obtained with the CBCT seg. Method and the 2D Digital Method. Conclusions A 3D CBCT Method has been developed. It presented good accuracy for the intercanine width, intermolar width, and arch length, but not for the mesiodistal tooth sizes. Model segmentation will be necessary for measurements of tooth size.

  • Comparative study of reproducibility and accuracy in measuring mesiodistal tooth sizes using three different Methods: 2D Digital, 3D CBCT, and 3D CBCT segmented
    Oral Radiology, 2015
    Co-Authors: Yanira Hernandez, Jose Luis Gandia, Beatriz Tarazona, Natalia Zamora, Rosa Cibrian, Vanessa Paredes
    Abstract:

    To develop a 3D cone-beam computed tomography (CBCT) Method (CBCT Method) for determining tooth sizes and arch dimensions and to compare the accuracy and reproducibility of that Method with those of a previously described 3D segmented CBCT Method (CBCT seg. Method) and a 2D Digital Method. Plaster study models and CBCT images were available for 34 patients. For the first Method, the plaster study casts were Digitalized and measured using the 2D Digital Method. For the second Method, CBCT seg. Method, the CBCT images were sent in DICOM format to InVivoDental® Company for segmentation and conversion into three-dimensional images of the models. For the third Method, CBCT Method, axial cuts were performed on the CBCT images, and tooth sizes and arch dimensions were measured using Anatomage® software. Significant differences were found between the tooth size measurements obtained with the 3D CBCT Method and the 2D Digital Method, but not for the intercanine width, intermolar width, and arch length. There were no significant differences between the measurements obtained with the CBCT seg. Method and the 2D Digital Method. A 3D CBCT Method has been developed. It presented good accuracy for the intercanine width, intermolar width, and arch length, but not for the mesiodistal tooth sizes. Model segmentation will be necessary for measurements of tooth size.

  • a new accurate and fast Digital Method to predict unerupted tooth size
    Angle Orthodontist, 2009
    Co-Authors: Vanessa Paredes, Jose Luis Gandia, Rosa Cibria
    Abstract:

    Abstract The sum of the lower incisor tooth width has been proposed as the best predictor for calculating unerupted canine and premolar mesiodistal tooth sizes. The aims of this study were to develop a new, fast, and accurate computerized Method to predict unerupted mesiodistal tooth sizes and to determine which reference tooth or combination of reference teeth was the best predictor for canines and premolars in a Spanish sample. The dental casts of 100 Spanish adolescents with permanent dentition were measured to the nearest 0.05 mm with a two-dimensional computerized system. The goal was to predict unerupted canine and premolar mesiodistal tooth sizes using the sizes of the upper central incisor, upper and lower first molar, or a combination of these as a reference and using a specific mesiodistal tooth-size table. The results showed that the Digital Method proposed was very accurate in predicting unerupted canine and premolar tooth size. The combination of the sums of the permanent upper central inciso...