Patents by Inventor ZhiGuo Shi
ZhiGuo Shi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11976891Abstract: The present invention relates to the field of fluid heat transfer, and discloses a heat transfer enhancement pipe as well as a cracking furnace and an atmospheric and vacuum heating furnace including the same. The heat transfer enhancement pipe (1) includes a pipe body (10) of tubular shape having an inlet (100) for entering of a fluid and an outlet (101) for said fluid to flow out; internal wall of the pipe body (10) is provided with a fin (11) protruding towards interior of the pipe body (10), the fin (11) spirally extends in an axial direction of the pipe body (10), wherein a height of the fin (11) gradually increases from one end in at least a part extension of the fin. The heat transfer enhancement pipe can reduce thermal stress of itself, thereby increasing service life of the heat transfer enhancement pipe.Type: GrantFiled: October 25, 2018Date of Patent: May 7, 2024Assignees: China Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical CorporationInventors: Guoqing Wang, Junjie Liu, Lijun Zhang, Cong Zhou, Zhaobin Zhang, Shasha Yang, Dongfa Shen, Xiaofeng Li, Shifang Yang, Zhiguo Du, Yonggang Zhang, Ying Shi, Jinghang Guo
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Patent number: 11879986Abstract: The present disclosure discloses a three-dimensional co-prime cubic array direction-of-arrival estimation method based on a cross-correlation tensor, mainly solving the problems of multi-dimensional signal structured information loss and Nyquist mismatch in existing methods and comprising the following implementing steps: constructing a three-dimensional co-prime cubic array; carrying out tensor modeling on a receiving signal of the three-dimensional co-prime cubic array; calculating six-dimensional second-order cross-correlation tensor statistics; deducing a three-dimensional virtual uniform cubic array equivalent signal tensor based on cross-correlation tensor dimension merging transformation; constructing a four-dimensional virtual domain signal tensor based on mirror image augmentation of the three-dimensional virtual uniform cubic array; constructing a signal and noise subspace in a Kronecker product form through virtual domain signal tensor decomposition; and acquiring a direction-of-arrival estimationType: GrantFiled: January 20, 2021Date of Patent: January 23, 2024Assignee: Zhejiang UniversityInventors: Zhiguo Shi, Hang Zheng, Chengwei Zhou, Jiming Chen, Yong Wang
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Patent number: 11841448Abstract: The present invention belongs to the field of array signal processing and relates to a composite tensor beamforming method for an electromagnetic vector coprime planar array. The method includes: building an electromagnetic vector coprime planar array; performing tensor modeling of an electromagnetic vector coprime planar array receiving signal; designing a three-dimensional weight tensor corresponding to a coprime sparse uniform sub-planar array; forming a tensor beam power pattern of the coprime sparse uniform sub-planar array; and performing electromagnetic vector coprime planar array tensor beamforming based on coprime composite processing of the sparse uniform sub-planar array. Starting from the principles of receiving signal tensor spatial filtering of two sparse uniform sub-planar arrays that compose the electromagnetic vector coprime planar array, the present invention forms a coprime composite processing method based on a sparse uniform sub-planar array output signal.Type: GrantFiled: December 16, 2020Date of Patent: December 12, 2023Assignee: Zhejiang UniversityInventors: Jiming Chen, Zhiguo Shi, Hang Zheng, Chengwei Zhou
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Patent number: 11841282Abstract: A strain gauge (12, 21A, 21B, 25A, 25B, 31, 35, 41, 45) and method of manufacturing a strain gauge (12, 21A, 21B, 25A, 25B, 31, 41, 35, 45) against moisture penetration comprises or includes the step of producing a coated base or cover layer (14, 34, 44) by forming a moisture barrier coating (17) on the surface the latter.Type: GrantFiled: August 30, 2019Date of Patent: December 12, 2023Assignees: Mettler-Toledo (Changzhou) Precision Instrument Co. Ltd., Mettler-Toledo (Changzhou) Measurement Technology Co. Ltd., Mettler-Toledo International Trading (Shanghai) Co. Ltd., Mettler-Toledo GmbHInventors: XiangQun Zhu, Zhiguo Shi, Lei Xu, Jean-Christophe Emery
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Patent number: 11822993Abstract: Disclosed is a slot-type ultra-wideband depolarized chipless RFID tag. The tag comprises a tag slot unit, a metal plate and a dielectric substrate, wherein the tag slot unit is formed by means of etching the metal plate, and is located on the upper surface of the dielectric substrate; the tag slot unit is composed of at least four annular slot groups, and tags are distributed in a centrosymmetric manner; and each annular slot group is composed of four concentric annular slots that are distributed in a nested manner; a transceiver antenna TX transmits a horizontally polarized electromagnetic wave; a scattered wave obtained; a transceiver acquires a frequency spectrum of the scattered wave; the spectrum is converted into a time-domain signal; a response of the tag is extracted; and an MFCC feature of the time-domain signal is extracted.Type: GrantFiled: November 1, 2022Date of Patent: November 21, 2023Assignee: ZHEJIANG UNIVERSITYInventors: Shibo He, Jiming Chen, Zhiguo Shi, Yuhao Chen
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Publication number: 20230280433Abstract: Disclosed in the present invention is a method for estimating a direction of arrival of a sub-array partition type L-shaped coprime array based on fourth-order sampling covariance tensor denoising, which mainly solves problems of a damage to a signal structure and noise term interference to high-order virtual domain statistics in an existing method. The implementation steps are as follows: constructing an L-shaped coprime array partitioned with linear sub-arrays; modeling a receiving signal of the L-shaped coprime array and deriving a second-order cross-correlation matrix thereof, deriving a fourth-order covariance tensor based on the cross-correlation matrix; realizing fourth-order sampling covariance tensor denoising based on kernel tensor thresholding; deriving a fourth-order virtual domain signal based on denoised sampling covariance tensor; constructing a denoised structured virtual domain tensor; obtaining a direction of arrival estimation result by decomposing the structured virtual domain tensor.Type: ApplicationFiled: October 29, 2021Publication date: September 7, 2023Applicant: Zhejiang UniversityInventors: Jiming CHEN, Hang ZHENG, Chengwei ZHOU, Zhiguo SHI
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Publication number: 20230213606Abstract: The disclosure provides a method for estimating a direction of arrival of an L-type coprime array based on coupled tensor decomposition. The method includes: constructing an L-type coprime array with separated sub-arrays and modeling a received signal; deriving a fourth-order covariance tensor of the received signal of the L-type coprime array; deriving a fourth-order virtual domain signal corresponding to an augmented virtual uniform cross array; dividing the virtual uniform cross array by translation; constructing a coupled virtual domain tensor by stacking a translation virtual domain signal; and obtaining a direction of arrival estimation result by coupled virtual domain tensor decomposition.Type: ApplicationFiled: July 12, 2021Publication date: July 6, 2023Applicant: Zhejiang UniversityInventors: Hang ZHENG, Chengwei ZHOU, Zhiguo SHI, Jiming CHEN
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Patent number: 11630980Abstract: Discloses a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding, which comprises a tag patch unit, a dielectric substrate and a grounding layer, wherein the tag patch unit comprises a barcode-type resonant unit and a double L-type resonant unit; the barcode-type resonant unit consists of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-type resonant unit is formed by reversely combining two L-type patches composed of four identical rectangular patches; a transmitting antenna transmits horizontally polarized electromagnetic waves as interrogation signals, the scattered waves reflected by the tag are acquired by a receiving antenna, a receiver acquires the spectrum of the scattered waves to convert the spectrum into time domain signals by inverse Fourier transform, the response of the tag is extracted through a window, and MFCC features are extracted by pre-emphasis and short-time Fourier transform.Type: GrantFiled: June 8, 2022Date of Patent: April 18, 2023Assignee: ZHEJIANG UNIVERSITYInventors: Jiming Chen, Shibo He, Zhiguo Shi, Yuhao Chen
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Publication number: 20230055481Abstract: The present disclosure discloses a three-dimensional co-prime cubic array direction-of-arrival estimation method based on a cross-correlation tensor, mainly solving the problems of multi-dimensional signal structured information loss and Nyquist mismatch in existing methods and comprising the following implementing steps: constructing a three-dimensional co-prime cubic array; carrying out tensor modeling on a receiving signal of the three-dimensional co-prime cubic array; calculating six-dimensional second-order cross-correlation tensor statistics; deducing a three-dimensional virtual uniform cubic array equivalent signal tensor based on cross-correlation tensor dimension merging transformation; constructing a four-dimensional virtual domain signal tensor based on mirror image augmentation of the three-dimensional virtual uniform cubic array; constructing a signal and noise subspace in a Kronecker product form through virtual domain signal tensor decomposition; and acquiring a direction-of-arrival estimationType: ApplicationFiled: January 20, 2021Publication date: February 23, 2023Applicant: Zhejiang UniversityInventors: Zhiguo SHI, Hang ZHENG, Chengwei ZHOU, Jiming CHEN, Yong WANG
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Publication number: 20230048754Abstract: Disclosed is a slot-type ultra-wideband depolarized chipless RFID tag. The tag comprises a tag slot unit, a metal plate and a dielectric substrate, wherein the tag slot unit is formed by means of etching the metal plate, and is located on the upper surface of the dielectric substrate; the tag slot unit is composed of at least four annular slot groups, and tags are distributed in a centrosymmetric manner; and each annular slot group is composed of four concentric annular slots that are distributed in a nested manner; a transceiver antenna TX transmits a horizontally polarized electromagnetic wave; a scattered wave obtained; a transceiver acquires a frequency spectrum of the scattered wave; the spectrum is converted into a time-domain signal; a response of the tag is extracted; and an MFCC feature of the time-domain signal is extracted.Type: ApplicationFiled: November 1, 2022Publication date: February 16, 2023Inventors: Shibo HE, Jiming CHEN, Zhiguo SHI, Yuhao CHEN
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Publication number: 20230048116Abstract: The present invention belongs to the field of array signal processing and relates to a composite tensor beamforming method for an electromagnetic vector coprime planar array. The method includes: building an electromagnetic vector coprime planar array; performing tensor modeling of an electromagnetic vector coprime planar array receiving signal; designing a three-dimensional weight tensor corresponding to a coprime sparse uniform sub-planar array; forming a tensor beam power pattern of the coprime sparse uniform sub-planar array; and performing electromagnetic vector coprime planar array tensor beamforming based on coprime composite processing of the sparse uniform sub-planar array. Starting from the principles of receiving signal tensor spatial filtering of two sparse uniform sub-planar arrays that compose the electromagnetic vector coprime planar array, the present invention forms a coprime composite processing method based on a sparse uniform sub-planar array output signal.Type: ApplicationFiled: December 16, 2020Publication date: February 16, 2023Applicant: Zhejiang UniversityInventors: Jiming CHEN, Zhiguo SHI, Hang ZHENG, Chengwei ZHOU
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Patent number: 11567161Abstract: The invention discloses a method for estimating the direction-of-arrival of a coprime array based on virtual domain statistics reconstruction of single-bit quantized signal. The realization steps are as follows: arranging a coprime array and a single-bit analog-to-digital converter at a receiving end; calculating equivalent virtual signal corresponding to a single-bit receipt signal of the coprime array; constructing a virtual domain augmented covariance matrix of an initialized single-bit quantized signal; designing, based on statistical correlation analysis between statistics of the single-bit quantized signal and the original unquantized signal, an optimization problem based on virtual domain statistics reconstruction of quantized signal; and performing direction-of-arrival estimation by utilizing the virtual domain augmented covariance matrix corresponding to the optimized single-bit quantized signal.Type: GrantFiled: November 3, 2020Date of Patent: January 31, 2023Assignee: ZHEJIANG UNIVERSITYInventors: Chengwei Zhou, Zhiguo Shi, Jiming Chen
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Publication number: 20220300782Abstract: Discloses a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding, which comprises a tag patch unit, a dielectric substrate and a grounding layer, wherein the tag patch unit comprises a barcode-type resonant unit and a double L-type resonant unit; the barcode-type resonant unit consists of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-type resonant unit is formed by reversely combining two L-type patches composed of four identical rectangular patches; a transmitting antenna transmits horizontally polarized electromagnetic waves as interrogation signals, the scattered waves reflected by the tag are acquired by a receiving antenna, a receiver acquires the spectrum of the scattered waves to convert the spectrum into time domain signals by inverse Fourier transform, the response of the tag is extracted through a window, and MFCC features are extracted by pre-emphasis and short-time Fourier transform.Type: ApplicationFiled: June 8, 2022Publication date: September 22, 2022Inventors: Jiming CHEN, Shibo HE, Zhiguo SHI, Yuhao CHEN
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Patent number: 11422177Abstract: Disclosed is a spatial spectrum estimation method with enhanced degree-of-freedom based on block sampling tensor construction for coprime planar array, which mainly solves the multi-dimensional information loss in signals and degree-of-freedom limitation in the existing methods and which is implemented by the following steps: constructing a coprime planar array; modeling block sampling tensors of the coprime planar array; deducing coarray statistics based on the block sampling cross-correlation tensor; obtaining block sampling coarray signals of a virtual uniform array; constructing a three-dimensional block sampling coarray tensor and its fourth-order auto-correlation statistics; constructing signal and noise subspaces based on fourth-order auto-correlation tensor decomposition; estimating a tensor spatial spectrum with enhanced degrees-of-freedom.Type: GrantFiled: August 6, 2021Date of Patent: August 23, 2022Assignee: ZHEJIANG UNIVERSITYInventors: Jiming Chen, Hang Zheng, Zhiguo Shi, Chengwei Zhou
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Patent number: 11408960Abstract: A two-dimensional direction-of-arrival estimation method for a coprime planar array based on structured coarray tensor processing, the method includes: deploying a coprime planar array; modeling a tensor of the received signals; deriving the second-order equivalent signals of an augmented virtual array based on cross-correlation tensor transformation; deploying a three-dimensional coarray tensor of the virtual array; deploying a five-dimensional coarray tensor based on a coarray tensor dimension extension strategy; forming a structured coarray tensor including three-dimensional spatial information; and achieving two-dimensional direction-of-arrival estimation through CANDECOMP/PARACFAC decomposition.Type: GrantFiled: August 13, 2021Date of Patent: August 9, 2022Assignee: ZHEJIANG UNIVERSITYInventors: Zhiguo Shi, Hang Zheng, Chengwei Zhou, Jiming Chen
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Publication number: 20220179031Abstract: The invention discloses a method for estimating the direction-of-arrival of a coprime array based on virtual domain statistics reconstruction of single-bit quantized signal, which mainly solves the problems of difficult realization of software and hardware, limited degree of freedom and the like in the prior art.Type: ApplicationFiled: November 3, 2020Publication date: June 9, 2022Applicant: ZHEJIANG UNIVERSITYInventors: Chengwei ZHOU, Zhiguo SHI, Jiming CHEN
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Patent number: 11300648Abstract: Disclosed is a high-resolution accurate two-dimensional direction-of-arrival estimation method based on coarray tensor spatial spectrum searching with coprime planar array, which solves the problem of multi-dimensional signal loss and limited spatial spectrum resolution and accuracy in existing methods. The implementation steps are: constructing a coprime planar array; tensor signal modeling for the coprime planar array; deriving coarray statistics based on coprime planar array cross-correlation tensor; constructing the equivalent signals of a virtual uniform array; deriving a spatially smoothed fourth-order auto-correlation coarray tensor; realizing signal and noise subspace classification through coarray tensor feature extraction; performing high-resolution accurate two-dimensional direction-of-arrival estimation based on coarray tensor spatial spectrum searching.Type: GrantFiled: August 6, 2021Date of Patent: April 12, 2022Assignee: ZHEJIANG UNIVERSITYInventors: Chengwei Zhou, Hang Zheng, Jiming Chen, Zhiguo Shi
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Publication number: 20220100815Abstract: The invention discloses a method of realizing accelerated parallel Jacobi computing for an FPGA. Data of a n×n-dimensional matrix are input to the FPGA, and a rotation transformation process is carried out by using parallel Jacobi computing. Processors are initialized. A diagonal processor computes a symbol set corresponding to a rotation angle and outputs the symbol set to a non-diagonal processor. Elements of the diagonal processor are updated. Elements of the non-diagonal processor are updated. Elements between the processors are exchanged. After the elements of the respective processors are updated, the updated elements between the processors are exchanged. The invention requires less FPGA resources while yields a higher internal computational processing performance of the FPGA. Accordingly, the invention is capable of facilitating the efficiency of realizing eigenvalue decomposition in the FPGA and is highly applicable in actual processing.Type: ApplicationFiled: April 19, 2019Publication date: March 31, 2022Applicant: ZHEJIANG UNIVERSITYInventors: Jiming CHEN, Zhiguo SHI, Junfeng WU, Qianwen HE, Ying LIU, Youxian SUN
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Publication number: 20210373113Abstract: A two-dimensional direction-of-arrival estimation method for a coprime planar array based on structured coarray tensor processing, the method includes: deploying a coprime planar array; modeling a tensor of the received signals; deriving the second-order equivalent signals of an augmented virtual array based on cross-correlation tensor transformation; deploying a three-dimensional coarray tensor of the virtual array; deploying a five-dimensional coarray tensor based on a coarray tensor dimension extension strategy; forming a structured coarray tensor including three-dimensional spatial information; and achieving two-dimensional direction-of-arrival estimation through CANDECOMP/PARACFAC decomposition.Type: ApplicationFiled: August 13, 2021Publication date: December 2, 2021Inventors: Zhiguo SHI, Hang ZHENG, Chengwei ZHOU, Jiming CHEN
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Publication number: 20210364564Abstract: Disclosed is a spatial spectrum estimation method with enhanced degree-of-freedom based on block sampling tensor construction for coprime planar array, which mainly solves the multi-dimensional information loss in signals and degree-of-freedom limitation in the existing methods and which is implemented by the following steps: constructing a coprime planar array; modeling block sampling tensors of the coprime planar array; deducing coarray statistics based on the block sampling cross-correlation tensor; obtaining block sampling coarray signals of a virtual uniform array; constructing a three-dimensional block sampling coarray tensor and its fourth-order auto-correlation statistics; constructing signal and noise subspaces based on fourth-order auto-correlation tensor decomposition; estimating a tensor spatial spectrum with enhanced degrees-of-freedom.Type: ApplicationFiled: August 6, 2021Publication date: November 25, 2021Inventors: Jiming CHEN, Hang ZHENG, Zhiguo SHI, Chengwei ZHOU