The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Jean Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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Synthetic studies on the MARDi cascade: stereoselective synthesis of heterocyclic seven-membered rings.
Organic letters, 2006Co-Authors: Yoann Coquerel, David Bensa, Alain Doutheau, Jean RodriguezAbstract:[reaction: see text] A versatile stereoselective synthesis of substituted and functionalized heterocyclic seven-membered rings is described. The approach involves a formal two-carbon ring expansion of heterocyclic cyclopentanones through a base-induced anionic domino three-Component Transformation named the MARDi cascade leading either to oxa-, aza-, or thiacycloheptanes bearing up to five contiguous stereogenic centers.
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A new multiComponent domino Transformation of 1,3-dicarbonyl compounds: One-pot regio-, chemo- and stereoselective access to valuable α, γ-difunctionalized α-ketoesters and amides
Synlett, 2002Co-Authors: Hadjira Habib-zahmani, Salih Hacini, Emmanuelle Charonnet, Jean RodriguezAbstract:A new multi-Component Transformation between 1,3-dicarbonyls 1, aldehydes 2, and allylic, propargylic or benzylic halides 3 is described. It provides a regio-, chemo- and stereoselective one-pot access to α,γ-difunctionalized α-ketoesters and amides 4, bearing a quaternary center valuable for further synthetic Transformations via ring-closing metathesis to give azaspiro systems found in bioactive natural products.
Yuan-yih Hsu - One of the best experts on this subject based on the ideXlab platform.
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A NOVEL APPROACH TO THE DESIGN OF A SHUNT ACTIVE FILTER UNDER NONSINUSOIDAL CONDITIONS FOR AN UNBALANCED THREE-PHASE FOUR-WIRE SYSTEM
2000Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fi"enta1 source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to a-p-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
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A novel approach to the design of a shunt active filter for an unbalanced three-phase four-wire system under nonsinusoidal conditions
IEEE Transactions on Power Delivery, 2000Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to /spl alpha/-/spl beta/-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
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A novel approach to the design of a shunt active filter for an unbalanced three-phase four-wire system under nonsinusoidal conditions
2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134), 1Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:Summary form only given as follows. A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to /spl alpha/-/spl beta/-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
Poleen M Ooi - One of the best experts on this subject based on the ideXlab platform.
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hardware implementation for face detection on xilinx virtex ii fpga using the reversible Component Transformation colour space
Symposium Workshop on Electronic Design Test and Applications, 2006Co-Authors: Poleen M OoiAbstract:Face detection is the process of locating the position where faces are present in an image. Not all proposed face detection methods are suitable for direct hardware implementation. This paper explains a method that utilises the reversible Component Transformation (RCT) colour space and outlines its transition from a software- to hardware-based implementation. The hardware performance and efficiency of the RCT algorithm is examined using the Xilinx Virtex-II field programmable gate arrays (FPGA). Results show that there is almost negligible difference in performance after transition to hardware and its implementation on FPGA requires 255,416 NAND gates, which is only slightly more than twice the number of NAND gates of a basic video-in application.
M. Po-leen Ooi - One of the best experts on this subject based on the ideXlab platform.
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DELTA - Hardware implementation for face detection on Xilinx Virtex-II FPGA using the reversible Component Transformation colour space
Third IEEE International Workshop on Electronic Design Test and Applications (DELTA'06), 2006Co-Authors: M. Po-leen OoiAbstract:Face detection is the process of locating the position where faces are present in an image. Not all proposed face detection methods are suitable for direct hardware implementation. This paper explains a method that utilises the reversible Component Transformation (RCT) colour space and outlines its transition from a software- to hardware-based implementation. The hardware performance and efficiency of the RCT algorithm is examined using the Xilinx Virtex-II field programmable gate arrays (FPGA). Results show that there is almost negligible difference in performance after transition to hardware and its implementation on FPGA requires 255,416 NAND gates, which is only slightly more than twice the number of NAND gates of a basic video-in application.
Cheng-che Chen - One of the best experts on this subject based on the ideXlab platform.
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A NOVEL APPROACH TO THE DESIGN OF A SHUNT ACTIVE FILTER UNDER NONSINUSOIDAL CONDITIONS FOR AN UNBALANCED THREE-PHASE FOUR-WIRE SYSTEM
2000Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fi"enta1 source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to a-p-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
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A novel approach to the design of a shunt active filter for an unbalanced three-phase four-wire system under nonsinusoidal conditions
IEEE Transactions on Power Delivery, 2000Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to /spl alpha/-/spl beta/-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
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A novel approach to the design of a shunt active filter for an unbalanced three-phase four-wire system under nonsinusoidal conditions
2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134), 1Co-Authors: Cheng-che Chen, Yuan-yih HsuAbstract:Summary form only given as follows. A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical Component Transformation to transform the three-phase voltages and currents to /spl alpha/-/spl beta/-o quantities. This makes practical implementation of the proposed method easier than the symmetrical Component Transformation approach. In addition, the power factor of the positive-sequence fundamental Component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.