Patents Assigned to Peking University
  • Patent number: 10552989
    Abstract: Provided is a point cloud attribute compression method based on a KD tree and optimized graph transformation, wherein same, with regard to point cloud data, reduces the influence of a sub-graph issue on the graph transformation efficiency by means of a new transformation block division method, optimizes a graph transformation kernel parameter, and improves the compression performance of the graph transformation, and comprises: point cloud pre-processing, point cloud KD tree division, graph construction in the transformation block, graph transformation kernel parameter training, and a point cloud attribute compression process.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: February 4, 2020
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Ge Li, Yiting Shao
  • Patent number: 10531817
    Abstract: The present invention relates to a fall detection method and system. The fall detection method comprises: receiving, by a first receiving antenna, a first WiFi signal stream propagating through an environment; receiving, by a second receiving antenna, a second WiFi signal stream propagating through the environment; determining a physical layer Channel State Information (CSI) stream, namely, a first CSI stream, of the first WiFi signal stream; determining a physical layer CSI stream, namely, a second CSI stream, of the second WiFi signal; determining a phase difference, namely, a CSI phase difference, between respective phase of the physical layer CSI stream of the first WiFi signal stream and the physical layer CSI stream of the second WiFi signal stream at the same time point, to form a CSI phase difference stream; and determining, according to the CSI streams and the CSI phase difference stream, a fall event.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: January 14, 2020
    Assignee: Peking University
    Inventors: Daqing Zhang, Hao Wang, Yasha Wang
  • Patent number: 10531093
    Abstract: A method and system for video frame interpolation based on an optical flow method is disclosed. The process includes calculating bidirectional motion vectors between two adjacent frames in a frame sequence of input video by using the optical flow method, judging reliabilities of the bidirectional motion vectors between the two adjacent frames, and processing a jagged problem and a noise problem in the optical flow method; marking “shielding” and “exposure” regions in the two adjacent frames, and updating an unreliable motion vector; with regard to the two adjacent frames, according to marking information about the “shielding” and “exposure” regions and the bidirectional motion vector field, mapping front and back frames to an interpolated frame to obtain a forward interpolated frame and a backward interpolated frame; synthesizing the forward interpolated frame and the backward interpolated frame into the interpolated frame; repairing a hole point in the interpolated frame to obtain a final interpolated frame.
    Type: Grant
    Filed: May 25, 2015
    Date of Patent: January 7, 2020
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Chuanxin Tang, Ronggang Wang, Zhenyu Wang, Wen Gao
  • Patent number: 10519184
    Abstract: The present invention relates to a 5-formylcytosine specific chemical labeling method and related applications in aspects such as sequencing, detection, imaging, and diagnosis. In the method, a condensation reaction occurs between an active methylene group in an active methylene compound containing a side-chain reactive group and an aldehyde group in 5-formylcytosine or a 1-substituted derivative of 5-formylcytosine, and at the same time an intramolecular reaction occurs between the side-chain reactive group of the active methylene compound and a 4-amino group of cytosine to implement ring closing.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: December 31, 2019
    Assignee: PEKING UNIVERSITY
    Inventors: Chengqi Yi, Bo Xia, Ankun Zhou
  • Patent number: 10523972
    Abstract: A method for encoding space-time signals comprises: collecting space-time signals of various local spatial positions in a monitoring area, and accumulating the space-time signals according to time, so as to obtain cumulative signal intensity values; transforming the cumulative signal intensity values by means of a filter, and outputting a pulse signal when a transformation result exceeds a specific threshold; arranging pulse signals corresponding to a local spatial position into a sequence according to the time, so as to obtain a pulse sequence expressing the local spatial position signals and a change process thereof; and arranging the pulse sequences of all local spatial positions into a pulse sequence array according to interrelation among the spatial positions to serve as an encoding for dynamic space-time signals of the monitoring area.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: December 31, 2019
    Assignee: PEKING UNIVERSITY
    Inventor: Tiejun Huang
  • Publication number: 20190380585
    Abstract: The present invention provides a femtosecond pulse laser modulator and a miniature two-photon microscopic imaging device. The femtosecond pulse laser modulator includes a negative dispersion light path and a positive dispersion light path, wherein the negative dispersion light path includes a laser input fiber, which is configured to transmit laser compensated for through prechirp; the positive dispersion light path is located between a femtosecond pulse laser and the negative dispersion light path, and is configured to compensate for, through prechirp, negative dispersion of the laser produced in the laser input fiber. The femtosecond laser modulator provided in the present invention provides distortion-free transmission for the femtosecond pulse laser with a center wavelength in 920 nm, and effectively excites commonly used biological indicators.
    Type: Application
    Filed: February 11, 2018
    Publication date: December 19, 2019
    Applicant: Peking University
    Inventors: Liangyi Chen, Weijian Zong, Heping Cheng, Runlong Wu, Mingli Li, Yunfeng Zhang, Aimin Wang
  • Patent number: 10500017
    Abstract: A digital control laser automatic tooth preparation method and device and a tooth positioner are provided. The device includes an intra-oral three-dimensional scanner, a dental laser, an oral working end, an oral and maxillofacial cone beam CT scanner, a computer, a tooth positioner, a negative-pressure suction device and a real-time monitoring device. The computer is connected respectively with the intra-oral three-dimensional scanner, the dental laser, the oral working end, the oral and maxillofacial cone beam CT scanner, the negative-pressure suction device, and the real-time monitoring device. The dental laser is connected with the oral working end of the digital control laser tooth preparation control system through a light guiding arm (1). The oral working end of the digital control laser tooth preparation control system is connected with the tooth positioner and the real-time monitoring device. The negative-pressure suction device is connected with the tooth positioner.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: December 10, 2019
    Assignee: Peking University School of Stomatology
    Inventors: Peijun Lv, Yong Wang, Yuchun Sun, Dangxiao Wang, Wenqi Ge, Ning Dai, Yongbo Wang, Jing Zhang, Chaohui Shi, Yuru Zhang, Lei Wang, Lei Ma, Haihua Cui, Huifu Li, Dongdong Wang
  • Patent number: 10494384
    Abstract: The present invention provides a urea peptidomimetic boronic compound and pharmaceutical compositions thereof, their preparative methods and uses. The compounds are represented by the following formula (I).
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: December 3, 2019
    Assignees: Peking University, Zhengzhou Granlen Pharmatech. Ltd.
    Inventors: Runtao Li, Haoyun An, Liqiang Han, Zemei Ge, Jingrong Cui, Tieming Cheng
  • Patent number: 10496418
    Abstract: The present application discloses a method for assembling ANDROID application based on application content. The method includes: 1) a server captures page information of an ANDROID application and creates an index, and saves metadata and index information of the page to a database, wherein the metadata includes the page jump logic of the ANDROID application; 2) a client sends a keyword input by a user to the server; 3) the server obtains an application list matching the keyword from the database and returns the metadata corresponding to the application list to the client; 4) after a target ANDROID application is selected from the application list, the client launches the target ANDROID application and automatically jumps to the page corresponding to the keyword according to the page jumping logic of the target ANDROID application. The invention breaks the isolation of information and provides a more natural assembly service among ANDROID applications.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: December 3, 2019
    Assignee: Peking University
    Inventors: Gang Huang, Xuanzhe Liu, Yi Liu, Yun Ma, Meihua Yu, Mengwei Xu
  • Patent number: 10496423
    Abstract: The invention discloses a method for opening up data and functions of device applications based on reconstruction technology. The method modifies the runtime environment of the application to obtain control flow information when the application function and data are used, to reconstruct the original control flow. This method conducts program analysis of run-time control flow and application static code, removes application function and data that are unrelated to sub-control flows, and retains a set of sub-control flows and contexts directly related to application functions and data. In certain context environment, the sub-set of the control flows are reconstructed to achieve respective application functions and to acquire the application data. The disclosed method can be used to open functions and data of applications based on Java, C++, and JavaScript, etc. on different types of devices.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: December 3, 2019
    Assignee: Peking University
    Inventors: Ying Zhang, Huaqian Cai, Gang Huang, Wei Yao
  • Patent number: 10490760
    Abstract: The present disclosure provides a thin-film transistor having a plurality of carbon nanotubes in its active layer, its manufacturing method, and an array substrate. The manufacturing method as such comprises: forming an insulating layer to at least substantially cover a channel region of the active layer between a source electrode and a drain electrode of the thin-film transistor, wherein the insulating layer is configured to substantially insulate from an environment, and have substantially little influence on, the plurality of carbon nanotubes in the active layer.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: November 26, 2019
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., PEKING UNIVERSITY
    Inventors: Xuelei Liang, Guanbao Hui, Jiye Xia, Fangzhen Zhang, Boyuan Tian, Qiuping Yan, Lianmao Peng
  • Publication number: 20190338257
    Abstract: Provided are an electron transport chain module from a eukaryotic organelle and an application thereof in biological nitrogen fixation. The electron transport chain (ETC) module is composed of the NifJ protein from Klebsiella oxytoca and a ferredoxin from plant chloroplasts or leucoplasts; plant-type ferredoxin-NADPH reductase (FNR) and the FdxH or FdxB protein from Anabaena; or an FNR and a Ferredoxin protein from plant organelles.
    Type: Application
    Filed: December 22, 2017
    Publication date: November 7, 2019
    Applicant: PEKING UNIVERSITY
    Inventors: Jianguo YANG, Mingxuan YANG, Ray DIXON, Yiping WANG, Xiaqing XIE
  • Patent number: 10450326
    Abstract: The present invention provides structural details of a thiazolopyrimidinone compound, a preparation method thereof, and use thereof in the manufacture of a medicament for the treatment of central nervous system diseases.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: October 22, 2019
    Assignee: PEKING UNIVERSITY
    Inventors: Kewei Wang, Qi Sun, Wenxuan Jiao, Jingshu Tang
  • Patent number: 10446707
    Abstract: An optical waveguide detector is provided, which includes: a silicon waveguide layer and a germanium waveguide layer. The germanium waveguide layer includes a first heavily germanium-doped area and a germanium-undoped area. A first surface of the germanium waveguide layer includes a surface of the first heavily germanium-doped area, and the first surface is a surface of the germanium waveguide layer away from the silicon waveguide layer in the first direction. A width of the first heavily germanium-doped area is less than or equal to half a width of the first surface, and a thickness of the first heavily germanium-doped area is greater than or equal to 5 nm and less than or equal to 200 nm. According to embodiments, a bandwidth of the optical waveguide detector can be effectively increased.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: October 15, 2019
    Assignees: Huawei Technologies Co., Ltd., Peking University
    Inventors: Yonghao Fei, Jishi Cui, Yisheng Zhu
  • Publication number: 20190310499
    Abstract: The present invention relates to a temperature-controlled dimming film with a function of shielding near-infrared light, which comprises a polymer network skeleton and liquid crystal molecules, wherein the polymer network skeleton consists of a polymer-dispersed liquid crystal network structure and a polymer-stabilized liquid crystal network structure and comprises a polymer matrix with pores inside which polymer networks are vertically aligned; and the liquid crystal molecules are dispersed in the polymer network skeleton and have smectic (SmA)-cholesteric (N*) phase transition. Between the skeleton and the liquid crystal molecules, nanoparticles, having absorption at 800-3000 nm, are dispersed. In the invention, a stepwise polymerization method is utilized to construct a PD&SLC network structure between two substrates, which greatly improve the bonding strength between the two substrates and the heat insulation performance of the temperature-controlled liquid crystal dimming film.
    Type: Application
    Filed: June 29, 2017
    Publication date: October 10, 2019
    Applicant: PEKING UNIVERSITY
    Inventors: Huai YANG, Xiao LIANG, Mei CHEN, Shumeng GUO, Lanying ZHANG, Cuihong ZHANG, Qian WANG, Chenyue LI, Cheng ZOU
  • Patent number: 10431160
    Abstract: An organic light emitting diode panel, a gate driver circuit and a gate driver circuit unit are disclosed, where the gate driver circuit includes a scanning signal generating unit for generating a scanning signal, transmitting a first clock signal to a scanning signal output terminal under the control of a pulse signal, and pulling down and maintaining the voltage of the scanning signal output terminal at a low voltage level under the control of a second clock signal. The gate driver circuit unit also includes a light emitting signal generating unit for generating a light emitting signal, pulling down the voltage of the light emitting signal output terminal under the control of the pulse signal, and charging the light emitting signal output terminal under the control of the second clock signal.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: October 1, 2019
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Shengdong Zhang, Zhijin Hu, Congwei Liao, Wenjie Li, Junmei Li, Shijie Cao
  • Patent number: 10424054
    Abstract: A low-illumination image processing method and device address the problem of noise amplification in existing contrast enhancement techniques when applied to original low-illumination image. A noise suppression filter is additionally arranged before an operation of contrast enhancement, and smoothing processing is performed on an inverse color image of a low-illumination image by adopting a first filtering coefficient and a second filtering coefficient, so that image contrast is enhanced while random noise is suppressed. Texture and noise level parameter of an image are calculated according to a local characteristic inside block of the image. Weighted averaging is performed on a first smoothing image and a second smoothing image after smoothing processing according to the texture and noise level parameters.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: September 24, 2019
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Lin Li, Ronggang Wang, Chengzhou Tang, Zhenyu Wang, Wen Gao
  • Patent number: 10424075
    Abstract: A method and a device for post-processing depth/disparity maps adopt a strategy of combining edge information and segmentation information when detecting irregular edge regions. The method includes dividing a color image into super pixels when performing image segmentation on a color image; partitioning a grayscale range into a preset number of intervals, and for each super pixel, statistically obtaining a histogram of all the pixel points that fall within the intervals; determining, in a current super pixel, whether a ratio of the number of pixels contained in the interval having a maximum interval distribution value, to the total number of pixels in the current super pixel is less than the first threshold; and if so, further dividing the current super pixel using a color-based segmentation method. The disclosed method and device improve accuracy of color image division while ensuring image processing speed, thus improving detection accuracy of the irregular edge regions.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: September 24, 2019
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Jianbo Jiao, Ronggang Wang, Zhenyu Wang, Wenmin Wang, Wen Gao
  • Patent number: 10424052
    Abstract: An image representation method and processing device based on local PCA whitening. A first mapping module maps words and characteristics to a high-dimension space. A principal component analysis module conducts principal component analysis in each corresponding word space, to obtain a projection matrix. A VLAD computation module computes a VLAD image representation vector; a second mapping module maps the VLAD image representation vector to the high-dimension space. A projection transformation module conducts projection transformation on the VLAD image representation vector obtained by means of projection. A normalization processing module conducts normalization on characteristics obtained by means of projection transformation, to obtain a final image representation vector.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: September 24, 2019
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Wenmin Wang, Mingmin Zhen, Ronggang Wang, Ge Li, Shengfu Dong, Zhenyu Wang, Ying Li, Wen Gao
  • Patent number: 10425640
    Abstract: A method, a device and an encoder for controlling filtering of intra-frame prediction reference pixel point are disclosed. The method includes: when various reference pixel points in a reference pixel group of an intra-frame block to be predicted are filtered, and the target reference pixel point to be filtered currently is not an edge reference pixel point in a reference pixel group (S202), acquiring a pixel difference value between the target reference pixel point and n adjacent reference pixel points thereof (S203); and selecting a filter with the filtering grade thereof corresponding to the pixel difference value to filter the target reference pixel point (S204). For various reference pixel points not located at an edge in a reference pixel group, according to the local difference characteristics of these reference pixel points, filters with corresponding filtering grades are flexibly configured, thus providing flexibility and adaptivity to the filtering, achieving better effect.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: September 24, 2019
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Ronggang Wang, Kui Fan, Zhenyu Wang, Wen Gao