Patents Assigned to Beijing Jiaotong University
  • Patent number: 10374902
    Abstract: A Kernel-power-density based method for wireless channel multipath components (MPCs) clustering. Signals get to the receiver from a transmitter via multipath propagation. MIMO channels can be modeled as double-directional, which contains the information of power, delay, direction of departure (DOD) and direction of arrival (DOA) of MPCs. The MPCs tend to appear in clusters. All the parameters of MPCs can be estimated by using high-resolution algorithms, such as MUSIC, CLEAN, SAGE, and RiMAX. Considering a data snapshot for a certain time with several clusters, which include a number of MPCs, where each MPC is represented by its power, delay, DOD and DOA. This invention adopts a novel clustering framework by using a density based method, which can better identify the local density variations of MPCs and requires no prior knowledge about clusters. It can work for the cluster oriented channel processing technology in future wireless communication field.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: August 6, 2019
    Assignee: Beijing Jiaotong University
    Inventors: Ruisi He, Bo Ai, Qingyong Li, Qi Wang, Li'ao Gengyang, Ruifeng Chen, Zhangdui Zhong, Jian Yu
  • Patent number: 10296685
    Abstract: The present invention provides a failure logic modeling method for a high-speed railway train operation control on-board system, including the following steps: determining the functional relationship between the structure and the parts of the train control on-board system; analyzing the failures of the parts based on known failures of the train control on-board system in combination with brainstorming; establishing an FMEA table to generalize the failures of the parts; editing and simulating the failures by using a modeling tool. By adopting the present invention, the failure modes analyzed are more systematic, and the failure logic modeling can be carried out from a global perspective more easily, the whole process can be better targeted meanwhile, the security analysis complexity of the train control system will be effectively reduced and the development period of the train control system will be shortened.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: May 21, 2019
    Assignee: BEIJING JIAOTONG UNIVERSITY
    Inventors: Wei Zheng, Lingyun Yang, Weijie Kong, Dewang Ren, Lixiang Wang
  • Publication number: 20190063910
    Abstract: A laser measurement system and method for measuring a six-degree-of-freedom geometric error of a rotating shaft includes a laser emission unit, a six-degree-of-freedom error measurement unit, a six-degree-of-freedom error sensing unit and a servo tracking unit capable of being installed on the rotating shaft to be measured, in which the error measurement unit enables light to be emergent from the error sensing unit and generates a measuring signal according to emergent light and reflected light and backward reflected light of the error sensing unit, and the servo tracking unit includes a four-dimensional adjustment mechanism for realizing four-dimensional adjustment; a motor fixedly installed on the adjustment mechanism; an angle measurement sensor for measuring a rotation angle of the motor; an installation plane fixed on the adjustment mechanism, coaxially rotating with the motor and used for installing the error sensing unit; and a control circuit for controlling the servo tracking unit according to the me
    Type: Application
    Filed: May 11, 2017
    Publication date: February 28, 2019
    Applicant: Beijing Jiaotong University
    Inventors: Qibo Feng, Jing Yang
  • Publication number: 20180174487
    Abstract: A braille display, belonging to the technical field of blind people reading devices, uses a memory alloy material to realize recessing and protruding of a braille point array of the braille display. The braille display is mainly composed of any number of braille recessing-protruding dot arrays, each of which includes several individual point locations, an outer frame and signal boards. Each of the individual dots comprises upper and lower telescoping members, an upper conductive connecting member, an intermediate conductive connecting member, a lower conductive connecting member, external sleeve locks and guide rods. The recessing-protruding change of braille points is realized through specific connection of various specific components. By using the braille display, the endurance capability is improved, and the cost is reduced. Moreover, since the braille display has a relatively small volume, the braille display can be applied to a mobile portable device or a wearable device.
    Type: Application
    Filed: June 7, 2016
    Publication date: June 21, 2018
    Applicants: CHINA BRAILLE LIBRARY, BEIJING JIAOTONG UNIVERSITY
    Inventors: Xin CHEN, Houjin CHEN, Meng HAN, Qilin YOU, Tianqi WANG, Yang YANG
  • Patent number: 9982997
    Abstract: A laser measurement system for measuring up to 21 geometric errors, in which a six-degree-of-freedom geometric error simultaneous measurement unit and a beam-turning unit are mounted on either the clamping workpiece or the clamping tool, while an error-sensitive unit is mounted on the remaining one, the beam-turning unit has several switchable working postures and multi-component combinations in its installation state, it can split or turn the laser beam from the six-degree-of-freedom geometric error simultaneous measurement unit to the X, Y, and Z directions in a proper order, or the beam-turning unit can split or turn a beam from the error-sensitive unit to the six-degree-of-freedom geometric error simultaneous measurement unit. The present invention is of simple configuration and convenient operation. Up to 21 geometric errors of three mutual perpendicular linear motion guides are obtained by a single installation and step-by-step measurement.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: May 29, 2018
    Assignee: Beijing Jiaotong University
    Inventors: Qibo Feng, Bin Zhang, Cunxing Cui
  • Publication number: 20180131575
    Abstract: A Kernel-power-density based method for wireless channel multipath components (MPCs) clustering. Signals get to the receiver from a transmitter via multipath propagation. MIMO channels can be modeled as double-directional, which contains the information of power, delay, direction of departure (DOD) and direction of arrival (DOA) of MPCs. The MPCs tend to appear in clusters. All the parameters of MPCs can be estimated by using high-resolution algorithms, such as MUSIC, CLEAN, SAGE, and RiMAX. Considering a data snapshot for a certain time with several clusters, which include a number of MPCs, where each MPC is represented by its power, delay, DOD and DOA. This invention adopts a novel clustering framework by using a density based method, which can better identify the local density variations of MPCs and requires no prior knowledge about clusters. It can work for the cluster oriented channel processing technology in future wireless communication field.
    Type: Application
    Filed: March 2, 2017
    Publication date: May 10, 2018
    Applicant: Beijing Jiaotong University
    Inventors: Ruisi He, Bo Ai, Qingyong Li, Qi Wang, Li'ao Gengyang, Ruifeng Chen, Zhangdui Zhong, Jian Yu
  • Patent number: 9857161
    Abstract: A six degree of freedom laser simultaneous measurement system, wherein a laser emitting unit is separated from a fixed sensor head; the laser emitting unit is connected with the fixed sensor head by a single polarization maintaining fiber; a moving unit comprising the reflector and the beam splitter is mounted on the linear guide; utilizing of the single polarization maintaining fiber, which connects the laser emitting unit with the fixed sensor head, reduces the influence of heat generated by laser source on the measurement accuracy, and makes the system more compact and integrated. The six degree of freedom errors, including position error, horizontal and vertical straightness errors, pitch, raw and roll, can be measured simultaneously by only one incident light. The non-cable connection on the moving unit makes long-distance and in-situ measurement possible.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: January 2, 2018
    Assignee: Beijing Jiaotong University
    Inventors: Qibo Feng, Bin Zhang, Zhan Gao, Cunxing Cui
  • Patent number: 9714885
    Abstract: The present invention provides a fault prediction and condition-based repair method of an urban rail train bogie. An optimum service life distribution model of a framework, a spring device, a connecting device, a wheel set and axle box, a driving mechanism, and a basic brake device of a bogie is determined by adopting a method based on survival analysis; a reliability characteristic function of each subsystem is obtained; then, a failure rate of each subsystem of the bogie is calculated by adopting a neural network model optimized by an evolutionary algorithm; and finally, proportional risk modelling is conducted by taking the failure rate and safe operation days of each subsystem of the bogie as concomitant variables; and on the basis of cost optimization, thresholds and control limits for condition-based repair of a bogie system are obtained.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: July 25, 2017
    Assignee: BEIJING JIAOTONG UNIVERSITY
    Inventors: Yong Qin, Limin Jia, Jingxuan Shi, Xiaoqing Cheng, Yuan Zhang, Shan Yu, Linlin Kou, Zhenyu Zhang
  • Publication number: 20170124234
    Abstract: The present invention provides a failure logic modeling method for a high-speed railway train operation control on-board system, including the following steps: determining the functional relationship between the structure and the parts of the train control on-board system; analyzing the failures of the parts based on known failures of the train control on-board system in combination with brainstorming; establishing an FMEA table to generalize the failures of the parts; editing and simulating the failures by using a modeling tool. By adopting the present invention, the failure modes analyzed are more systematic, and the failure logic modeling can be carried out from a global perspective more easily, the whole process can be better targeted meanwhile, the security analysis complexity of the train control system will be effectively reduced and the development period of the train control system will be shortened.
    Type: Application
    Filed: April 24, 2014
    Publication date: May 4, 2017
    Applicant: BEIJING JIAOTONG UNIVERSITY
    Inventors: Wei ZHENG, Lingyun YANG, Weijie KONG, Dewang REN, Lixiang WANG
  • Patent number: 9630637
    Abstract: The invention discloses a complex network-based high speed train system safety evaluation method. The method includes steps as follows: (1) constructing a network model of a physical structure of a high speed train system, and constructing a functional attribute degree of a node based on the network model; (2) extracting a functional attribute degree, a failure rate and mean time between failures of a component as an input quantity, conducting an SVM training using LIBSVM software; (3) conducting a weighted kNN-SVM judgment: an unclassifiable sample point is judged so as to obtain a safety level of the high speed train system. For a high speed train system having a complicated physical structure and operation conditions, the method can evaluate the degree of influences on system safety when a state of a component in the system changes. The experimental result shows that the algorithm has high accuracy and good practicality.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: April 25, 2017
    Assignee: BEIJING JIAOTONG UNIVERSITY
    Inventors: Limin Jia, Yong Qin, Yanhui Wang, Shuai Lin, Hao Shi, Lifeng Bi, Lei Guo, Lijie Li, Man Li
  • Publication number: 20170015339
    Abstract: The invention discloses a complex network-based high speed train system safety evaluation method. The method includes steps as follows: (1) constructing a network model of a physical structure of a high speed train system, and constructing a functional attribute degree of a node based on the network model; (2) extracting a functional attribute degree, a failure rate and mean time between failures of a component as an input quantity, conducting an SVM training using LIBSVM software; (3) conducting a weighted kNN-SVM judgment: an unclassifiable sample point is judged so as to obtain a safety level of the high speed train system. For a high speed train system having a complicated physical structure and operation conditions, the method can evaluate the degree of influences on system safety when a state of a component in the system changes. The experimental result shows that the algorithm has high accuracy and good practicality.
    Type: Application
    Filed: November 27, 2015
    Publication date: January 19, 2017
    Applicant: BEIJING JIAOTONG UNIVERSITY
    Inventors: Limin JIA, Yong QIN, Yanhui WANG, Shuai LIN, Hao SHI, Lifeng BI, Lei GUO, Lijie LI, Man LI
  • Patent number: 9538185
    Abstract: A multi-description-based video encoding and decoding method, device and system, comprising the following steps: separating odd frames from even frames to generate and encode an initial description; utilizing the correlation of macro-block levels between different descriptions to generate and encode the side information of different modes; and transmitting via a channel. The present invention may be used in a real-time video transmission scenario.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: January 3, 2017
    Assignee: Beijing Jiaotong University
    Inventors: Yao Zhao, Huihui Bai
  • Publication number: 20160282229
    Abstract: The present invention provides a fault prediction and condition-based repair method of an urban rail train bogie. An optimum service life distribution model of a framework, a spring device, a connecting device, a wheel set and axle box, a driving mechanism, and a basic brake device of a bogie is determined by adopting a method based on survival analysis; a reliability characteristic function of each subsystem is obtained; then, a failure rate of each subsystem of the bogie is calculated by adopting a neural network model optimized by an evolutionary algorithm; and finally, proportional risk modelling is conducted by taking the failure rate and safe operation days of each subsystem of the bogie as concomitant variables; and on the basis of cost optimization, thresholds and control limits for condition-based repair of a bogie system are obtained.
    Type: Application
    Filed: December 5, 2014
    Publication date: September 29, 2016
    Applicant: BEIJING JIAOTONG UNIVERSITY
    Inventors: Yong QIN, Limin JIA, Jingxuan SHI, Xiaoqing CHENG, Yuan ZHANG, Shan YU, Linlin KOU, Zhenyu ZHANG
  • Patent number: 9139210
    Abstract: The present invention discloses a calculation method of movement authority for communications-based train control system, comprising: handling a route information for a train, and determining a searching range of the train according to the route information; initializing the limit of movement authority with the end position of the searching range; searching for static obstacles within the searching range, and successively determining whether each static obstacle meets the safety requirements for train operating, if not, setting the position of the last static obstacle within the searching range as the limit of the movement authority; if so, modifying the limit of movement authority as the end of route having been matched; searching for dynamic obstacles within the searching range, and determining whether there is a train, if so, modifying the end of movement authority as the beginning point of the track section where the train is occupying; if there is no dynamic obstacle within the searching range, modifying
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: September 22, 2015
    Assignee: BEIJING JIAOTONG UNIVERSITY
    Inventors: Bin Ning, Haifeng Wang, Tao Tang, Chunhai Gao, Xuwen Yang, Shuo Liu
  • Patent number: 8935565
    Abstract: A dual-channel hot standby system and a method for carrying out dual-channel hot standby, the system comprises a hot standby status management layer including two hot standby management units, an application processing layer including two application processors, and a data communication layer including two communicators; the hot standby status management layer is used for controlling the setting and switching between a active status and a standby status of the two application processors, monitoring the working status of the data communication layer, and carrying out synchronization of the control cycles for the two channels of the system; wherein one of the hot standby management units controls one of the application processors, and together constitute a channel of the system therewith; the data communication layer is used for receiving data from outside, and forwarding the data to the application processing layer.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: January 13, 2015
    Assignee: Beijing Jiaotong University
    Inventors: Tao Tang, Lianchuan Ma, Xi Wang, Binbin Yuan
  • Patent number: 8855085
    Abstract: A Wireless Local Area Network (WLAN) handover method is provided. The method comprises a mobile station receiving probe frames sent in a predefined time interval from a current associated access point and an adjacent access point during a preset time period. The station obtains and stores a signal strength for each access point based on the beacon frames. The station performs fuzzy processing of the signal strengths and change rates of the signal strengths to obtain fuzzy data characterizing levels of the signal strengths and the change rates. The station performs fuzzy reasoning based on the fuzzy data to obtain reasoning outputs. A target access point is determined by the station based on the reasoning outputs. The station authenticates with the target access point, and sends a re-association request frame to the target access point. Re-association is established after a re-association response frame is received by the station.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: October 7, 2014
    Assignee: Beijing Jiaotong University
    Inventors: Bin Ning, Hongwei Wang, Hailin Jiang, Bing Bu
  • Publication number: 20130218375
    Abstract: The present invention discloses a calculation method of movement authority for communications-based train control system, comprising: handling a route information for a train, and determining a searching range of the train according to the route information; initializing the limit of movement authority with the end position of the searching range; searching for static obstacles within the searching range, and successively determining whether each static obstacle meets the safety requirements for train operating, if not, setting the position of the last static obstacle within the searching range as the limit of the movement authority; if so, modifying the limit of movement authority as the end of route having been matched; searching for dynamic obstacles within the searching range, and determining whether there is a train, if so, modifying the end of movement authority as the beginning point of the track section where the train is occupying; if there is no dynamic obstacle within the searching range, modifying
    Type: Application
    Filed: August 23, 2011
    Publication date: August 22, 2013
    Applicant: BEIJING JIAOTONG UNIVERSITY
    Inventors: Bin Ning, Haifeng Wang, Tao Tang, Chunhai Gao, Xuwen Yang, Shuo Liu
  • Publication number: 20130179723
    Abstract: A dual-channel hot standby system and a method for carrying out dual-channel hot standby, the system comprises a hot standby status management layer including two hot standby management units, an application processing layer including two application processors, and a data communication layer including two communicators; the hot standby status management layer is used for controlling the setting and switching between a active status and a standby status of the two application processors, monitoring the working status of the data communication layer, and carrying out synchronization of the control cycles for the two channels of the system; wherein one of the hot standby management units controls one of the application processors, and together constitute a channel of the system therewith; the data communication layer is used for receiving data from outside, and forwarding the data to the application processing layer.
    Type: Application
    Filed: July 20, 2011
    Publication date: July 11, 2013
    Applicant: BEIJING JIAOTONG UNIVERSITY
    Inventors: Tao Tang, Lianchuan Ma, Xi Wang, Binbin Yuan
  • Patent number: 8351349
    Abstract: In Universal Network, there is disclosed a method and system for realizing location management of multihomed terminals, the system comprises home domains and foreign domains, in which the home domains of a multihomed terminal refer to the domains managing the multihomed terminal; the other domains are the foreign domains of the multihomed terminal; each domain includes at least one Identifier Mapping Server and one Accessing-Switching Router; the Identifier Mapping Server memorizes and manages the mapping information; and the Accessing-Switching Router allocates the mapping information for multihomed terminals. This invention facilitates the implement of multihoming in the Internet and makes the network resources be used efficiently. Especially, the Internet service providers can manage the multihomed terminals easily and efficiently.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: January 8, 2013
    Assignee: Beijing Jiaotong University
    Inventors: Ping Dong, Haisheng Jiang, Hongke Zhang, Dong Yang, Yajuan Qin, Xiaobo Liu, Feng Qiu
  • Patent number: 8068439
    Abstract: A method of Concurrent Multipath Transfer which is based on the relational paths, characterized in that for a packet lost in a path, it allows other packets sent from the path and/or other paths to point out the lost packet through a gap report. According to the present invention, any lost packets and abnormal paths can be found as fast as possible, and can be retransmitted quickly. So this method can avoid the failure of all paths from handing in packets to upper layer only for the abnormity in one path, which limits the speed of whole association.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: November 29, 2011
    Assignee: Beijing Jiaotong University
    Inventors: Hongke Zhang, Chang Liu, Dong Yang, Ping Dong, Yajuan Qin, Huan Yan, Liang Sun