Patents by Inventor Qingwen Liu
Qingwen Liu 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).
-
Patent number: 11970355Abstract: The present disclosure relates to a collection device and a preparation system, including a pre-adjustment mechanism which is disposed in a housing and configured to adjust at least one bundle of carbon nanotube aggregates, and includes a first pre-adjustment sub-mechanism and a second pre-adjustment sub-mechanism for adjusting carbon nanotube aggregations along a first direction and a second direction, respectively; a winding mechanism for winding and collecting the carbon nanotube aggregates passing through the pre-adjustment mechanism.Type: GrantFiled: March 26, 2018Date of Patent: April 30, 2024Assignee: SUZHOU JERNANO CARBON CO., LTD.Inventors: Da Li, Hehua Jin, Qingwen Li, Zhenzhong Yong, Maolin Liu, Dianli Hu
-
Publication number: 20240084675Abstract: An apparatus for preventing and controlling secondary generation of hydrates in a wellbore during depressurization exploitation of offshore natural gas hydrates includes a gas recovery pipe column, a water recovery pipe column, a gas-liquid mixed transportation pipe section, a data collecting and processing unit, and a reaction control apparatus; according to characteristics of different exploitation pipe columns, three injection pipelines and three monitoring points are arranged to predict dynamic changes in a secondary generation risk of the hydrates throughout the wellbore; measures for preventing and controlling the secondary generation of the hydrates are taken at different pipe column positions by the integrated utilization of inhibitor injection, heating for pipe columns, the additional arrangement of electric submersible pumps, and other methods.Type: ApplicationFiled: June 27, 2023Publication date: March 14, 2024Inventors: Jianbo Zhang, Zhiyuan Wang, Xiaohui Sun, Baojiang Sun, Hui Liu, Shikun Tong, Qingwen Kong, Peng Liu
-
Patent number: 11522024Abstract: A display screen, comprising a panel (1), a light-emitting plate (2), a light blocking film (3) and an image sensor (4) that are stacked sequentially.Type: GrantFiled: May 9, 2017Date of Patent: December 6, 2022Assignee: Vkansee (Beijing) Technology Co., Ltd.Inventors: Mingfang Zhang, Yuanjing Wang, Qingwen Liu
-
Publication number: 20220241686Abstract: A system/method for a cloud game can improve sharing to a social application that is locally running on a terminal. The system/method improves the scalability of cloud games, provides improved information processing, improves the sociality of cloud games, achieves a high degree of dissemination of cloud games, improves the degree of participation of players in cloud games, and improves the interaction rate of cloud games. The system/method includes logging, by a terminal, in to a cloud game installed in a server based on a trigger instruction of a cloud game login portal, transmitting an operation instruction to the server on which the cloud game is installed, and receiving sharing information including data to-be-shared transmitted by the server. The terminal can share the data to-be-shared to a target social application.Type: ApplicationFiled: April 22, 2022Publication date: August 4, 2022Applicant: Tencent Technology (Shenzhen) Company LimitedInventors: Haiyang Liu, Minhua Xu, Qingwen Liu, Jiang Zhou, Zhipeng Gong, Jiaping Wu
-
Patent number: 10989587Abstract: A distributed fibre sensing system and a vibration detection and positioning method therefor are disclosed. The system comprises: a signal generating module, a light source module, an optical frequency comb generating module, a frequency sweeping and pulse generating module, an optical circulator, a sensing fibre, an interference module, a photoelectric conversion module and a detection and position module. The method comprises: obtaining a plurality of Rayleigh backscattering signals of the sensing fibre; performing a fading elimination processing on the Rayleigh backscattering signals, thereby obtaining a plurality of averaged Rayleigh backscattering signals of non-interference fading and polarization fading; performing a phase processing on the averaged Rayleigh backscattering signals, thereby obtaining phase variance curves; and determining a vibration point according to variances in the phase variance curves, and finally obtaining a position and a vibration waveform of the vibration point.Type: GrantFiled: August 26, 2016Date of Patent: April 27, 2021Assignees: SHANGHAI JIAOTONG UNIVERSITY, NEUBREX CO., LTD.Inventors: Zuyuan He, Qingwen Liu, Dian Chen, Xinyu Fan
-
Publication number: 20200182685Abstract: A distributed fibre sensing system and a vibration detection and positioning method therefor are disclosed. The system comprises: a signal generating module, a light source module, an optical frequency comb generating module, a frequency sweeping and pulse generating module, an optical circulator, a sensing fibre, an interference module, a photoelectric conversion module and a detection and position module. The method comprises: obtaining a plurality of Rayleigh backscattering signals of the sensing fibre; performing a fading elimination processing on the Rayleigh backscattering signals, thereby obtaining a plurality of averaged Rayleigh backscattering signals of non-interference fading and polarization fading; performing a phase processing on the averaged Rayleigh backscattering signals, thereby obtaining phase variance curves; and determining a vibration point according to variances in the phase variance curves, and finally obtaining a position and a vibration waveform of the vibration point.Type: ApplicationFiled: August 26, 2016Publication date: June 11, 2020Inventors: Zuyuan HE, Qingwen LIU, Dian CHEN, Xinyu FAN
-
Publication number: 20200127066Abstract: A display screen, comprising a panel (1), a light-emitting plate (2), a light blocking film (3) and an image sensor (4) that are stacked sequentially.Type: ApplicationFiled: May 9, 2017Publication date: April 23, 2020Inventors: Mingfang Zhang, Yuanjing Wang, Qingwen Liu
-
Patent number: 10461850Abstract: Frequency synthesis-based optical frequency domain reflectometry method and system are disclosed. The method is to implement optical frequency reflectometry and comprises: performing an electro-optic modulation and an acousto-optic modulation on a local light to obtain an optical pulse; inputting the optical pulse as a detection pulse optical signal to a test optical fiber; and detecting an obtained Rayleigh backscattered optical signal under coherent detection with the local light, and then performing a photoelectric conversion and a demodulation, wherein: the electro-optic modulation is performed by using a single frequency signal; the acousto-optic modulation is performed by using a pulse signal; and the optical pulse is obtained by simultaneously sweeping multiple frequency components of an optical comb signal which is obtained by the electro-optic modulation.Type: GrantFiled: January 5, 2016Date of Patent: October 29, 2019Assignees: SHANGHAI JIAOTONG UNIVERSITY, NEUBREX CO., LTD.Inventors: Zuyuan He, Qingwen Liu, Xinyu Fan, Dian Chen
-
Publication number: 20190013862Abstract: Frequency synthesis-based optical frequency domain reflectometry method and system are disclosed. The method is to implement optical frequency reflectometry and comprises: performing an electro-optic modulation and an acousto-optic modulation on a local light to obtain an optical pulse; inputting the optical pulse as a detection pulse optical signal to a test optical fiber; and detecting an obtained Rayleigh backscattered optical signal under coherent detection with the local light, and then performing a photoelectric conversion and a demodulation, wherein: the electro-optic modulation is performed by using a single frequency signal; the acousto-optic modulation is performed by using a pulse signal; and the optical pulse is obtained by simultaneously sweeping multiple frequency components of an optical comb signal which is obtained by the electro-optic modulation.Type: ApplicationFiled: January 5, 2016Publication date: January 10, 2019Applicants: SHANGHAI JIAOTONG UNIVERSITY, NEUBREX CO., LTD.Inventors: Zuyuan HE, Qingwen LIU, Xinyu FAN, Dian CHEN
-
Patent number: 8195240Abstract: A hybrid time-spatial multiplexing technique is provided for beamforming broadcast messages to mobile stations that may be within a coverage region or cell of a base station. The coverage region is divided into a plurality of segments. The mobile stations are assigned to at least one of the segments based on their locations within the coverage region or other criteria. The base station computes beamforming antenna weights which are configured to produce a radiation beam pattern from a plurality of antennas of the base station to respective ones of each of the plurality of segments in the region. A broadcast message is transmitted to each segment of the region in a time-division multiplexed manner using the beamforming antenna weights associated with the radiation beam pattern for the corresponding segment.Type: GrantFiled: April 15, 2008Date of Patent: June 5, 2012Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John Grabner, Li Guo, Qingwen Liu
-
Patent number: 8130875Abstract: The present invention discloses a method for estimating a channel response of data subcarriers in a wireless communications network. The method comprises estimating a first plurality of channel responses of pilot subcarriers carrying pilot signals at the time instance using pilot signals, generating a pseudo time instance for pilot subcarriers according to a predetermined rule, approximating a second plurality of channel responses at the pseudo time instance using the first plurality of channel responses, computing a rate of change in the channel response using the first and second plurality of channel responses, calculating a third plurality of channel responses of pilot subcarriers carrying data at the time instance using the first plurality of channel responses and the rate of change in the channel response, estimating the channel response of the data subcarriers from the first and third plurality of channel responses using a predetermined conventional two-dimensional channel estimation algorithm.Type: GrantFiled: October 30, 2007Date of Patent: March 6, 2012Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, Genyuan Wang, Hang Jin
-
Patent number: 8073489Abstract: The present invention discloses a method for allocating an uplink sounding region dynamically to obtain downlink channel quality information (CQI) about a downlink channel. The method comprises receiving a downlink transmission request and retrieving an identification information from the downlink transmission request, searching one or more databases using the retrieved identification information as a key, identifying the CQI about the downlink channel from the one or more databases, wherein the uplink sounding region needs not to be allocated when the CQI corresponding to the downlink transmission request is identified in the databases.Type: GrantFiled: November 7, 2007Date of Patent: December 6, 2011Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, Genyuan Wang, Hang Jin
-
Patent number: 8068445Abstract: A method and apparatus are provided for scheduling a transmission of uplink sounding signals for a mobile station (MS). The method comprises receiving a request to send the MS downlink signals associated with a service flow at a first frame, searching a scheduling database for pending uplink bandwidth requests from the MS, scheduling uplink transmission slots for the MS to transmit uplink signals in a second frame without scheduling a sounding signal when a uplink bandwidth request associated with the MS is present in the scheduling database, computing beamforming weighting vectors for the MS using the uplink signals, and transmitting the downlink signals using the beamforming weighting vectors at a third frame subsequent the first frame.Type: GrantFiled: November 1, 2007Date of Patent: November 29, 2011Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, Genyuan Wang, Hang Jin
-
Patent number: 7706812Abstract: A system and method are provided for detecting locations of a customer premises equipment in a wireless communication system with one or more base transceiver stations and one is efficient. A plurality of antennas in a base transceiver station (BTS) receives signals transmitted from a customer premises equipment (CPE). A timing detection module extracts the timing offset from the receiving signals and a first calculation module calculates the distance between the BTS and the CPE based on the timing offset. A signal detection module detects magnitudes and phases of the receiving signals and a second calculation module determines a dominant beam according to the antenna pattern and calculates the direction of arrival of the dominant beam. A third calculation module calculates the location of the CPE relative to the BTS based on the distance and the direction of arrival.Type: GrantFiled: April 12, 2007Date of Patent: April 27, 2010Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, Hang Jin, Weiguo Xie, John Grabner
-
Patent number: 7697485Abstract: The present invention discloses a method for wireless communications network performance in transmitting a message. The method comprises creating a first beamformed virtual antenna for the serving BTS and one or more second beamformed virtual antennas for the one or more target BTSs when one or more predetermined conditions are met, establishing a first beamformed channel by using the first beamformed virtual antenna, establishing one or more second beamformed channels by using the one or more second beamformed virtual antennas, and transmitting a plurality of signals comprising the message via the first and the one or more second beamformed channels.Type: GrantFiled: May 2, 2007Date of Patent: April 13, 2010Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, Hang Jin
-
Patent number: 7496386Abstract: A Customer-Premises Equipment (CPE) device includes a power supply for generating a first power at a first voltage level; a rechargeable battery for generating a second power at a second voltage level; and a power amplifier coupled to the power supply and the rechargeable battery for receiving the first power and the second power to output a third power at a third voltage level higher than either the first voltage level or the second voltage level, wherein the third power is utilized to transmit signals from the CPE device to a BTS.Type: GrantFiled: February 7, 2007Date of Patent: February 24, 2009Assignee: Cisco Technology, Inc.Inventors: Qingwen Liu, John Grabner, Hang Jin
-
Publication number: 20080261658Abstract: A hybrid time-spatial multiplexing technique is provided for beamforming broadcast messages to mobile stations that may be within a coverage region or cell of a base station. The coverage region is divided into a plurality of plurality of segments. The mobile stations are assigned to at least one of the segments based on their locations within the coverage region or other criteria. The base station computes beamforming antenna weights which are configured to produce a radiation beam pattern from a plurality of antennas of the base station to respective ones of each of the plurality of segments in the region. A broadcast message is transmitted to each segment of the region in a time-division multiplexed manner using the beamforming antenna weights associated with the radiation beam pattern for the corresponding segment.Type: ApplicationFiled: April 15, 2008Publication date: October 23, 2008Applicant: CISCO TECHNOLOGY, INC.Inventors: Hang Jin, John Grabner, Li Guo, Qingwen Liu
-
Publication number: 20080165728Abstract: The present invention discloses a method for scheduling a transmission of uplink sounding signals for a mobile station (MS). The method comprises receiving a request to send the MS downlink signals associated with a service flow at a first frame, searching a scheduling database for pending uplink bandwidth requests from the MS, scheduling uplink transmission slots for the MS to transmit uplink signals in a second frame without scheduling a sounding signal when a uplink bandwidth request associated with the MS being present in the scheduling database, computing beamforming weighting vectors for the MS using the uplink signals, and transmitting the downlink signals employing the beamforming weighting vectors at a third frame subsequent to the first frame.Type: ApplicationFiled: November 1, 2007Publication date: July 10, 2008Inventors: Qingwen Liu, Genyuan Wang, Hang Jin
-
Publication number: 20080139248Abstract: The present invention discloses a method for allocating an uplink sounding region dynamically to obtain downlink channel quality information (CQI) about a downlink channel. The method comprises receiving a downlink transmission request and retrieving an identification information from the downlink transmission request, searching one or more databases using the retrieved identification information as a key, identifying the CQI about the downlink channel from the one or more databases, wherein the uplink sounding region needs not to be allocated when the CQI corresponding to the downlink transmission request is identified in the databases.Type: ApplicationFiled: November 7, 2007Publication date: June 12, 2008Inventors: Qingwen Liu, Genyuan Wang, Hang Jin
-
Publication number: 20080096601Abstract: A Customer-Premises Equipment (CPE) device includes a power supply for generating a first power at a first voltage level; a rechargeable battery for generating a second power at a second voltage level; and a power amplifier coupled to the power supply and the rechargeable battery for receiving the first power and the second power to output a third power at a third voltage level higher than either the first voltage level or the second voltage level, wherein the third power is utilized to transmit signals from the CPE device to a BTS.Type: ApplicationFiled: February 7, 2007Publication date: April 24, 2008Inventors: Qingwen Liu, John Grabner, Hang Jin