The Experts below are selected from a list of 65115 Experts worldwide ranked by ideXlab platform
M.a. Hasan - One of the best experts on this subject based on the ideXlab platform.
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simultaneous minor Component Extraction via weighted inverse rayleigh quotient
International Conference on Acoustics Speech and Signal Processing, 2007Co-Authors: M.a. HasanAbstract:New criteria are proposed for extracting multiple minor Components associated with the covariance matrix of an input process. The proposed minor Component analysis (MCA) algorithms are based on optimizing a weighted inverse Rayleigh quotient so that the optimum weights at equilibrium points are exactly the desired eigenvectors of a covariance matrix instead of an arbitrary orthonormal basis of the minor subspace. Variations of the derived MCA learning rules are obtained by imposing orthogonal and quadratic constraints and change of variables. Some of the proposed algorithms can also perform PCA by merely changing the sign of the step-size. These algorithms may be seen as MCA counterparts of Oja's and Xu's systems for computing multiple principal Component analysis. Simulation results to demonstrate algorithm performance are also presented.
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Revisiting Weighted Inverse Rayleigh Quotient for Minor Component Extraction
2005 5th International Conference on Information Communications & Signal Processing, 2005Co-Authors: M.a. HasanAbstract:A framework for classes of minor Component learning rules is presented. In the proposed rules, eigenvectors of a covariance matrix are simultaneously estimated. The derivation of MCA rules is based on optimizing a weighted inverse Rayleigh quotient so that the optimum weights at equilibrium points are exactly the desired eigenvectors of a covariance matrix instead of an arbitrary orthonormal basis of the minor subspace. Variations of the derived MCA learning rules are obtained by imposing orthogonal and quadratic constraints and change of variables. Some of the proposed algorithms can also perform PCA by merely changing the sign of the step-size
Graham A Gie - One of the best experts on this subject based on the ideXlab platform.
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posterior longitudinal split osteotomy for femoral Component Extraction in revision total hip arthroplasty
Journal of Arthroplasty, 2008Co-Authors: Adrian John Bauze, John Charity, Eleftherios Tsiridis, John A Timperley, Graham A GieAbstract:We present a technique of single posterior longitudinal split osteotomy. This technique allows the expansion of the proximal femur and easier Extraction of uncemented femoral Components. Since 1998 we have performed this osteotomy in 12 revision total hip arthroplasties in 11 patients who had either stable fibrous ingrowth or a small amount of bony ingrowth. All were revised to a cemented Exeter stem (Stryker Benoist Gerard, Caen, France). No patient required conversion from a longitudinal split to an extended trochanteric osteotomy. At mean follow-up of 48 months, there were significant improvements in both pain and function. There were no complications due to this technique. Mean in-cement taper engagement (subsidence) was 1.1 mm (range, 0-2 mm). Femoral impaction grafting did not adversely affect the cement mantle or increase in-cement taper engagement. With appropriate patient selection, this is a simple, reliable, and extensile technique to assist in the Extraction of uncemented ongrowth femoral Components whether hydroxyapatite-coated or not.
Adrian John Bauze - One of the best experts on this subject based on the ideXlab platform.
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posterior longitudinal split osteotomy for femoral Component Extraction in revision total hip arthroplasty
Journal of Arthroplasty, 2008Co-Authors: Adrian John Bauze, John Charity, Eleftherios Tsiridis, John A Timperley, Graham A GieAbstract:We present a technique of single posterior longitudinal split osteotomy. This technique allows the expansion of the proximal femur and easier Extraction of uncemented femoral Components. Since 1998 we have performed this osteotomy in 12 revision total hip arthroplasties in 11 patients who had either stable fibrous ingrowth or a small amount of bony ingrowth. All were revised to a cemented Exeter stem (Stryker Benoist Gerard, Caen, France). No patient required conversion from a longitudinal split to an extended trochanteric osteotomy. At mean follow-up of 48 months, there were significant improvements in both pain and function. There were no complications due to this technique. Mean in-cement taper engagement (subsidence) was 1.1 mm (range, 0-2 mm). Femoral impaction grafting did not adversely affect the cement mantle or increase in-cement taper engagement. With appropriate patient selection, this is a simple, reliable, and extensile technique to assist in the Extraction of uncemented ongrowth femoral Components whether hydroxyapatite-coated or not.
Mohd Amran Mohd Radzi - One of the best experts on this subject based on the ideXlab platform.
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operation of three level inverter based shunt active power filter under nonideal grid voltage conditions with dual fundamental Component Extraction
IEEE Transactions on Power Electronics, 2018Co-Authors: Yap Hoon, Mohd Khair Hassan, Mohd Amran Mohd Radzi, Nashiren Farzilah MailahAbstract:In this paper, a new reference current generation method is proposed for effective harmonics mitigation and reactive power compensation of three-level neutral-point diode clamped inverter-based shunt active power filter (SAPF) under nonideal grid voltage conditions. The proposed method is named as dual fundamental Component Extraction algorithm. In operation, the proposed algorithm extracts at the same time, the desired fundamental current and voltage Components for generating reference current and synchronization phases, respectively. As a result, the proposed algorithm is able to generate reference current that ensures in phase operation of SAPF with the operating power system, without depending on any phase-locked loop elements. Besides, the proposed algorithm employs self-tuning filter (STF) for accurate computation of the fundamental Components. Design concept and effectiveness of the proposed algorithm are thoroughly studied and evaluated in MATLAB–Simulink. Additionally, a laboratory prototype utilizing TMS320F28335 digital signal processor is built to validate its feasibility. Encouraging findings obtained from both simulation and experimental works demonstrate effectiveness of the proposed algorithm under both ideal and nonideal grid voltage conditions.
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Dual Function of Unified Adaptive Linear Neurons Based Fundamental Component Extraction Algorithm for Shunt Active Power Filter Operation
International Review of Electrical Engineering (IREE), 2015Co-Authors: Nor Farahaida Abdul Rahman, Mohd Amran Mohd Radzi, Azura Che Soh, Norman Mariun, Nasrudin Abd RahimAbstract:Unified Adaptive Linear Neurons (ADALINEs) based fundamental Component Extraction algorithm is presented for better operation of a Shunt Active Power Filter (SAPF). The proposed algorithm is developed for dual functionality. The first role is to generate a reference current for the SAPF. Whilst, the second function is to coordinate the phase of the generated reference current with the phase of any operating power system. Consequently, the operation of the SAPF will be synchronized with the operating power system. Hence, it replaces the necessity of using conventional synchronization algorithms such as Phase-Locked Loops (PLLs) and Zero-Crossing Detectors (ZCDs). In this work, the proposed algorithm is executed using an integration of two ADALINEs based fundamental current and voltage Extraction algorithms. Also, it implements the modified on-line Widrow-Hoff (W-H) weight updating algorithm for high speed Extraction process. The effectiveness of the proposed algorithm has been verified in both simulation and experimental works.
Nasrudin Abd Rahim - One of the best experts on this subject based on the ideXlab platform.
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Dual Function of Unified Adaptive Linear Neurons Based Fundamental Component Extraction Algorithm for Shunt Active Power Filter Operation
International Review of Electrical Engineering (IREE), 2015Co-Authors: Nor Farahaida Abdul Rahman, Mohd Amran Mohd Radzi, Azura Che Soh, Norman Mariun, Nasrudin Abd RahimAbstract:Unified Adaptive Linear Neurons (ADALINEs) based fundamental Component Extraction algorithm is presented for better operation of a Shunt Active Power Filter (SAPF). The proposed algorithm is developed for dual functionality. The first role is to generate a reference current for the SAPF. Whilst, the second function is to coordinate the phase of the generated reference current with the phase of any operating power system. Consequently, the operation of the SAPF will be synchronized with the operating power system. Hence, it replaces the necessity of using conventional synchronization algorithms such as Phase-Locked Loops (PLLs) and Zero-Crossing Detectors (ZCDs). In this work, the proposed algorithm is executed using an integration of two ADALINEs based fundamental current and voltage Extraction algorithms. Also, it implements the modified on-line Widrow-Hoff (W-H) weight updating algorithm for high speed Extraction process. The effectiveness of the proposed algorithm has been verified in both simulation and experimental works.