Patents by Inventor Chaofeng Li
Chaofeng Li 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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Publication number: 20230222919Abstract: The present invention proposes a vessel traffic pattern identification method via data quality control and data compression. Firstly, assort a collection of Automatic Identification system (AIS) data points according to Mobile Service Identify (MMSI) code and sort each collection result by time ascending order, and then delete duplicated vessel AIS data points considering time stamp, latitude, longitude and vessel speed over ground, then segment vessel trajectories. Secondly obtain high-quality AIS data with an AIS data anomaly detection and repair and compress each vessel trajectory with the Douglas-Peucker algorithm. Thirdly, cluster vessel trajectories with the Quick Bundles algorithm, and identify maritime traffic pattern. The invention can efficiently identify vessel traffic patterns, and help maritime traffic management departments to accurately identify a traffic situation.Type: ApplicationFiled: October 30, 2022Publication date: July 13, 2023Inventors: Xinqiang Chen, Qiuying Wang, Yongsheng Yang, Bing Han, Zhongdai Wu, Huafeng Wu, Yang Sun, Chaofeng Li, Jiangfeng Xian, Wei Liu
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Patent number: 11515134Abstract: A method for strontium isotope analysis of picogram-level samples using highly sensitive silicotungstic acid emitter is presented by a thermal ionization mass spectrometry. The emitter has merits of extremely high sensitivity, low cost, simple operation, etc. It is an important innovation of the strontium isotope analysis of the picogram-level samples. Compared with a sample consumption of 1-50 ng of conventional emitter, the present invention only needs 30-200 pg to obtain satisfying measurement accuracy. The present invention greatly improves test sensitivity, and has broad application prospects in future.Type: GrantFiled: November 30, 2019Date of Patent: November 29, 2022Assignee: Institute of Geology and Geophysics Chinese Academy of SciencesInventor: Chaofeng Li
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Patent number: 11127579Abstract: A zircon ID-TIMDS Pb isotope determination method by multiple ion counters with a dynamic multi-collection protocol is provided. Compared with a commonly used multi-ion counter static determination method, the method provided by the present invention completely eliminates influences of gain differences of the different ion counters on determination results of Pb isotopes. Compared with a conventional single-ion counter determination method with five times of peak-jumps, the method provided by the present invention can obtain all of Pb isotope ratios with two times of peak-jumps, which increases the collection efficiency of Pb isotope ion beams and decreases influences of ion beam stability on Pb isotope analysis results.Type: GrantFiled: June 29, 2020Date of Patent: September 21, 2021Assignee: Institute of Geology and Geophysics, Chinese Academy of SciencesInventors: Zhuyin Chu, Chaofeng Li, Wengui Liu, Wei Wang, Jinghui Guo
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Publication number: 20210054270Abstract: An emitter for nickel isotope analysis of trace samples, its preparation and application are provided, wherein: the emitter is a zirconium hydrogen phosphate emitter; and the zirconium hydrogen phosphate emitter specifically comprises a zirconium hydrogen phosphate suspension and phosphoric acid solution as an auxiliary material. To prepare the zirconium hydrogen phosphate suspension, the zirconium hydrogen phosphate powder must be washed alternately with hydrochloric acid and high-purity water 3 to 4 times to reduce the sample loading blank. The application specifically relates to analytical method, specifically using zirconium hydrogen phosphate suspension as a high-sensitivity emitter to enhance the ionization efficiency of nickel samples, while using phosphoric acid solution to assist ionization, and using high-purity tungsten filament as the sample carrier to determine trace nickel isotope method.Type: ApplicationFiled: November 6, 2020Publication date: February 25, 2021Inventor: Chaofeng Li
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Publication number: 20200335319Abstract: A zircon ID-TIMDS Pb isotope determination method by multiple ion counters with a dynamic multi-collection protocol is provided. Compared with a commonly used multi-ion counter static determination method, the method provided by the present invention completely eliminates influences of gain differences of the different ion counters on determination results of Pb isotopes. Compared with a conventional single-ion counter determination method with five times of peak-jumps, the method provided by the present invention can obtain all of Pb isotope ratios with two times of peak-jumps, which increases the collection efficiency of Pb isotope ion beams and decreases influences of ion beam stability on Pb isotope analysis results.Type: ApplicationFiled: June 29, 2020Publication date: October 22, 2020Inventors: Zhuyin Chu, Chaofeng Li, Wengui Liu, Wei Wang, Jinghui Guo
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Patent number: 10674402Abstract: A load balancing method, an access controller and a load balancing system are provided. The method includes receiving load status association information from a plurality of APs in a wireless local area network, respectively, the load status association information including load information and connectivity information, and the connectivity information being information for indicating one or more UEs that can be connected to an AP corresponding to the load status association information; determining, based on the load status association information, load statuses of the APs, and obtaining, using the load status association information, a load balancing connection scheme for balancing loads of the APs, when the load statuses satisfy a predetermined condition; and determining, based on the load balancing connection scheme, a correspondence relation between a specific UE and one of the plurality of APs to connect a UE and a corresponding AP.Type: GrantFiled: March 2, 2018Date of Patent: June 2, 2020Assignee: Ricoh Company, Ltd.Inventors: Yi Sun, Linju Yang, Haihua Yu, Chaofeng Li
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Publication number: 20200105514Abstract: A method for strontium isotope analysis of picogram-level samples using highly sensitive silicotungstic acid emitter is presented by a thermal ionization mass spectrometry. The emitter has merits of extremely high sensitivity, low cost, simple operation, etc. It is an important innovation of the strontium isotope analysis of the picogram-level samples. Compared with a sample consumption of 1-50 ng of conventional emitter, the present invention only needs 30-200 pg to obtain satisfying measurement accuracy. The present invention greatly improves test sensitivity, and has broad application prospects in future.Type: ApplicationFiled: November 30, 2019Publication date: April 2, 2020Inventor: Chaofeng Li
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Patent number: 10565551Abstract: A system for selecting items to be stored in a warehouse from a list of candidate items. The system includes a computing device having a processor and a storage device storing computer executable code. The executed code is configured to: assign scores to the respective candidate items based on an item selection model; and select items from the candidate items to be stored in the warehouse according to the assigned scores under a capacity limit of the warehouse. The item selection model is configured with an Artificial Neural Network (ANN), having item data for an item as input and a score for that item as output. The score represents a probability that the item is to be stored in the warehouse. The ANN is trained by historical orders with an objective of maximizing a probability that the orders have their respective item(s) all stored in the same warehouse.Type: GrantFiled: May 9, 2018Date of Patent: February 18, 2020Assignees: Beijing Jingdong Shangke Information Technology Co., Ltd., JD.com American Technologies CorporationInventors: Yuhui Shi, Yixiong Chen, Chaofeng Li, Di Wu
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Patent number: 10482644Abstract: A method, an apparatus and an electronic device for processing a panoramic image are provided. The method includes converting a first planar projection image of the panoramic image into a spherical image; determining a position of a region of interest in the spherical image; and cutting and expanding the spherical image based on the position of the region of interest in the spherical image, and obtaining a second planar projection image of the panoramic image. A distance between the region of interest in the second planar projection image and a center point of the second planar projection image is shorter than a distance between the region of interest in the first planar projection image and a center point of the first planar projection image.Type: GrantFiled: January 11, 2018Date of Patent: November 19, 2019Assignee: Ricoh Company, Ltd.Inventors: Chaofeng Li, Hong Yi, Liyan Liu, Haihua Yu, Hongyi Liu
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Publication number: 20190347607Abstract: A system for selecting items to be stored in a warehouse from a list of candidate items. The system includes a computing device having a processor and a storage device storing computer executable code. The executed code is configured to: assign scores to the respective candidate items based on an item selection model; and select items from the candidate items to be stored in the warehouse according to the assigned scores under a capacity limit of the warehouse. The item selection model is configured with an Artificial Neural Network (ANN), having item data for an item as input and a score for that item as output. The score represents a probability that the item is to be stored in the warehouse. The ANN is trained by historical orders with an objective of maximizing a probability that the orders have their respective item(s) all stored in the same warehouse.Type: ApplicationFiled: May 9, 2018Publication date: November 14, 2019Inventors: Yuhui Shi, Yixiong Chen, Chaofeng Li, Di Wu
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Publication number: 20180255480Abstract: A load balancing method, an access controller and a load balancing system are provided. The method includes receiving load status association information from a plurality of APs in a wireless local area network, respectively, the load status association information including load information and connectivity information, and the connectivity information being information for indicating one or more UEs that can be connected to an AP corresponding to the load status association information; determining, based on the load status association information, load statuses of the APs, and obtaining, using the load status association information, a load balancing connection scheme for balancing loads of the APs, when the load statuses satisfy a predetermined condition; and determining, based on the load balancing connection scheme, a correspondence relation between a specific UE and one of the plurality of APs to connect a UE and a corresponding AP.Type: ApplicationFiled: March 2, 2018Publication date: September 6, 2018Applicant: Ricoh Company, Ltd.Inventors: Tian YANG, Yi Sun, Linju Yang, Haihua Yu, Chaofeng Li
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Publication number: 20180253879Abstract: A method, an apparatus and an electronic device for processing a panoramic image are provided. The method includes converting a first planar projection image of the panoramic image into a spherical image; determining a position of a region of interest in the spherical image; and cutting and expanding the spherical image based on the position of the region of interest in the spherical image, and obtaining a second planar projection image of the panoramic image. A distance between the region of interest in the second planar projection image and a center point of the second planar projection image is shorter than a distance between the region of interest in the first planar projection image and a center point of the first planar projection image.Type: ApplicationFiled: January 11, 2018Publication date: September 6, 2018Applicant: Ricoh Company, Ltd.Inventors: Chaofeng LI, Hong Yi, Liyan Liu, Haihua Yu, Hongyi Liu
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Patent number: 9949215Abstract: Embodiments of the disclosure provide a method and apparatus for resource sharing for D2D and cellular communications in a multicell network. The method comprises steps of: acquiring CSI on channels relating to D2D pair and a plurality of cellular users that potentially share resources with the D2D pair; and determining D2D transmit powers of the D2D pair on a plurality of frequency bands allocated to the plurality of cellular users and cellular transmit powers of the plurality of cellular users based on the CSI, to improve throughput of the multicell network.Type: GrantFiled: May 3, 2013Date of Patent: April 17, 2018Assignee: NEC (China) Co., Ltd.Inventors: Chaofeng Li, Ming Lei, Jiaheng Wang, Daohua Zhu, Hua Zhang, Chunming Zhao
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Patent number: 9769840Abstract: Embodiments of the disclosure provide methods and apparatuses for scheduling a UE in a communication system comprising D2D communication and cellular communication. The cellular communication is performed between a base station (BS) and at least one UE, and the D2D communication is performed between a D2D transmitter and a D2D receiver. According to the method of the present invention, an outage margin of the D2D communication is obtained, wherein the outage margin indicates the margin that the communication from the D2D transmitter to the D2D receiver is in outage; and a target transmission power of the at least one UE is determined based on the outage margin to perform cellular scheduling.Type: GrantFiled: August 22, 2012Date of Patent: September 19, 2017Assignee: NEC (China) Co., Ltd.Inventors: Chaofeng Li, Yu Zhang, Ming Lei
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Patent number: 9680541Abstract: Embodiments of the present disclosure relate to methods and apparatuses for channel estimation and feedback in a three dimensional multiple input multiple output (3D-MIMO) system. A method may comprise: transmitting a plurality of reference signals for a plurality of columns in an antenna array; receiving indication information on configuration adjustment of a precoding information feedback, wherein the indication information is based on measurement on the plurality of reference signals; and adjusting a configuration of the precoding information feedback based on the indication information so that a multiple vertical precoding information feedback is enabled when it can obtain a performance gain. Especially, the multiple vertical precoding information feedback may represent feeding back a plurality of vertical precoding matrix indicators for the plurality of columns in the antenna array.Type: GrantFiled: August 13, 2013Date of Patent: June 13, 2017Assignee: NEC (China) Co., Ltd.Inventors: Chuangxin Jiang, Chaofeng Li, Ming Lei
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Patent number: 9578665Abstract: Embodiments of the disclosure provide methods and apparatuses for performing D2D communication in a communication system. The communication system may at least comprise a base station (BS), a D2D transmitter and a D2D receiver. The D2D transmitter transmits D2D data to the D2D receiver in a D2D communication. According to the method of the present invention, D2D data may be received from the D2D transmitter; and the received D2D data may be transmitted to the D2D receiver in response to receiving a negative message from the D2D receiver, wherein the negative message indicates that the D2D receiver fails to receive the D2D data from the D2D transmitter.Type: GrantFiled: June 6, 2012Date of Patent: February 21, 2017Assignee: NEC (China) Co., Ltd.Inventors: Chaofeng Li, Ming Lei
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Patent number: 9554388Abstract: The present disclosure provides a method and an apparatus of resource sharing for D2D and cellular communications. The method may comprise: determining a cellular user set containing potential cellular users that may share resources with a D2D pair; and determining transmit power of the D2D pair on a frequency band of at least one cellular user in the cellular user set and transmit power of the at least one cellular user through maximizing throughput of the D2D pair with a quality of service (QoS) constraint and a power budget constraint of each of the potential cellular users and a transmit power constraint of the D2D pair. With embodiments of the present disclosure, it may provide a non-orthogonal resource sharing solution in which a D2D pair can reuse resources of the cellular users as more as possible while the QoS of all the cellular users are guaranteed, whereby the performance of the D2D user may be improved greatly.Type: GrantFiled: December 31, 2012Date of Patent: January 24, 2017Assignee: NEC (China) Co., Ltd.Inventors: Chaofeng Li, Ming Lei, Jiaheng Wang, Daohua Zhu, Chunming Zhao, Zhi Ding
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Publication number: 20170005712Abstract: Embodiments of the invention provide a method for channel measurement and feedback. The method comprises transmitting a first CSI-RS and a second CSI-RS to a user equipment for vertical CSI measurement, wherein the first CSI-RS is based on antenna configuration of one vertical antenna element mapping to one vertical antenna port, and the second CSI-RS is based on antenna configuration of multiple vertical antenna elements mapping to one vertical antenna port. The method also comprises receiving at least one PMI fed back by the user equipment in accordance with the first CSI-RS and the second CSI-RS. The method further comprises determining a vertical precoding matrix for data transmission based on the at least one PMI.Type: ApplicationFiled: January 22, 2014Publication date: January 5, 2017Applicant: NEC CORPORATIONInventors: Chuangxin JIANG, Chaofeng LI, Ming LEI
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Patent number: 9479312Abstract: Methods and apparatuses for interference control have been disclosed. A method for a base station in a wireless communication system, comprising: obtaining a system setting of the wireless communication system; selecting a transmission mode based at least in part on the system setting, wherein the transmission mode is one of an Interference Cancellation IC transmission mode and a Beamforming BF transmission mode; and configuring the selected transmission mode. The total system throughput may be maximized by dynamically switching the transmission mode between IC and BF at the base station. Further, the proposed switching mechanism may be applied to various communication networks where downlink interference may occur.Type: GrantFiled: June 7, 2012Date of Patent: October 25, 2016Assignee: NEC (China) Co., Ltd.Inventors: Chaofeng Li, Ming Lei, Wei Xu, Le Liang, Hua Zhang, Shi Jin
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Publication number: 20160191128Abstract: Embodiments of the present disclosure relate to methods and apparatuses for channel estimation and feedback in a three dimensional multiple input multiple output (3D-MIMO) system. A method may comprise: transmitting a plurality of reference signals for a plurality of columns in an antenna array; receiving indication information on configuration adjustment of a precoding information feedback, wherein the indication information is based on measurement on the plurality of reference signals; and adjusting a configuration of the precoding information feedback based on the indication information so that a multiple vertical precoding information feedback is enabled when it can obtain a performance gain. Especially, the multiple vertical precoding information feedback may represent feeding back a plurality of vertical precoding matrix indicators for the plurality of columns in the antenna array.Type: ApplicationFiled: August 13, 2013Publication date: June 30, 2016Applicant: NEC (CHINA) CO., LTD.Inventors: Chuangxin JIANG, Chaofeng LI, Ming LEI