Patents by Inventor Lifeng Liu

Lifeng 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: 9047937
    Abstract: A resistive random access memory device, a method for manufacturing the resistive random access memory device, and a method for operating the resistive random access memory device are disclosed. The resistive random access memory device includes a resistive switching memory element including two electrodes and a layer of variable-resistance material between the two electrodes, wherein the layer of variable-resistance material exhibits bipolar resistive switching behavior; and a Schottky diode including a metal layer and a p-doped semiconductor layer which contact each other, wherein the metal layer of the Schottky diode is coupled to one of the two electrodes of the resistive switching memory element. The present disclosure provides the resistive random access memory device operating in bipolar resistive switching scheme.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: June 2, 2015
    Assignee: Peking University
    Inventors: Jinfeng Kang, Bin Gao, Yuansha Chen, Bing Sun, Lifeng Liu, Xiaoyan Liu
  • Publication number: 20150079931
    Abstract: A communications method, device, and system in a mobile backhaul transport network are used to resolve a problem in the prior art that communication security in a backhaul transport network cannot be ensured in an LTE scenario. A first network node sends a request message to a control server in the mobile backhaul transport network, where the request message is used to request security information of a second network node in the mobile backhaul transport network; the first network node receives the security information of the second network node, which is returned by the control server; the first network node establishes a secure tunnel with the second network node according to the security information of the second network node to perform communication. This enables two network nodes in a mobile backhaul transport network to perform secure communication and ensures security of communication between network nodes.
    Type: Application
    Filed: November 25, 2014
    Publication date: March 19, 2015
    Inventors: Lifeng LIU, Jian MENG, Yuchen WANG
  • Patent number: 8963275
    Abstract: A resistive-switching random access memory device includes a memory cell disposed between a bit line and a word line, the memory cell having a resistive-switching element (40) and a Schottky diode (30). The Schottky diode (30) and the resistive-switching element (40) are connected in series. The Schottky diode (30) includes a metal layer and a semiconductor layer contacting each other. An interface between the metal layer and the semiconductor layer has a non-planar shape.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: February 24, 2015
    Assignee: Peking University
    Inventors: Jinfeng Kang, Bin Gao, Lifeng Liu, Xiaoyan Liu
  • Patent number: 8929123
    Abstract: The present disclosure provides a resistive-switching device capable of implementing multiary addition operation and a method for implementing multiary addition operation using the resistive-switching device. The resistive-switching device has a plurality of resistance values each corresponding to a respective data value stored by the resistive-switching device and ranging from a high resistance value to a low resistance value. The data value stored by the resistive-switching device is increased by ‘1’ successively with a series of set pulses having a same pulse width and a same voltage amplitude being applied thereto. The data value stored by the resistive-switching device is set to ‘0’ with a reset pulse being applied thereto, and meanwhile a data value stored by a higher-bit resistive-switching device is increased by ‘1’ with a set pulse being applied thereto. In this way, multiary addition operation is implemented.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: January 6, 2015
    Assignee: Peking University
    Inventors: Jinfeng Kang, Feifei Zhang, Bin Gao, Bing Chen, Lifeng Liu, Xiaoyan Liu
  • Patent number: 8924321
    Abstract: A neuron device includes a bottom electrode, a top electrode, and a layer of metal oxide variable resistance material sandwiched between the bottom electrode and the top electrode, in which the neuron device is switched to a normal state upon application of reset pulse, and is switched to an excitation state upon application of stimulus pulses. The neuron device has a comprehensive response to different amplitude, different width of a stimulus voltage pulse and different number of a sequence of stimulus pulses, and provides functionalities of a weighting section and a computing section. The neuron device has a simple structure, excellent scalability, quick speed, low operation voltage, and is compatible with the conventional silicon-based CMOS fabrication process, and thus suitable for mass production. The neuron device is capable of performing many biological functions and complex logic operations.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: December 30, 2014
    Assignee: Peking University
    Inventors: Jinfeng Kang, Bin Gao, Feifei Zhang, Bing Chen, Lifeng Liu, Xiaoyan Liu
  • Publication number: 20140364589
    Abstract: A BrTCP24 gene for controlling the growth of Chinese cabbage and its applications. The BrTCP24 gene has the nucleotide sequence shown in SEQ ID No. 1, the whole length of which is 1221 bp. The gene is useful for improving the production of economic crop. As indicated by experimental results, the gene serves as a controlling gene for plant growth and has the function of down-regulating the plant growth. Through overexpressing the gene, a transgenic plant smaller than the wild one can be obtained. The gene of the invention can provide theory basis and gene source for breeding new varieties of crops.
    Type: Application
    Filed: August 19, 2013
    Publication date: December 11, 2014
    Applicant: VEGETABLE RESEARCH INSTITUTE OF SHANDONG, ACADEMY OF AGRICULTURAL SCIENCES
    Inventors: Jianwei Gao, Fengde Wang, Yihui Zhang, Lifeng Liu, Huayin Li, Libin Li, Lihua Wang, Cuihua Wang
  • Publication number: 20140359137
    Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for establishing an FCoE communication connection and a name server. According to a WWN world wide name identifier of a target to be accessed, a destination MAC address used to access the target to be accessed is acquired. According to the destination MAC address, a login operation is performed for the target to be accessed, to establish an FCoE fiber channel over Ethernet communication connection, so that an FCoE initiator may directly establish a communication connection with an FCoE target, thereby reducing data transmission delay and lightening the processing load of an original FCoE forwarder.
    Type: Application
    Filed: March 10, 2011
    Publication date: December 4, 2014
    Inventors: Lifeng Liu, Jian Meng, Yuchen Wang, Michael A. Ko
  • Publication number: 20140347913
    Abstract: A resistive switching memory device and a method for operating the same are disclosed. The device includes a plurality of resistive switching memory units arranged in a matrix, each of which includes a switching element and a resistive switching device, and the switching element being connected to a word line at its control terminal, to the resistive switching device at one terminal, and to a bit line at the other terminal; a word line decoder adapted to decode an input address signal to switch on the switching element in at least one of resistive switching memory units; and a driving circuit adapted to apply a voltage pulse whose front edge changes slowly across the resistive switching device by the bit line synchronously with the switching-on of the switching element.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 27, 2014
    Inventors: Jinfeng Kang, Bing Chen, Bin Gao, Feifei Zhang, Lifeng Liu, Xiaoyan Liu
  • Publication number: 20140327513
    Abstract: A macromolecule-based conductive composite material and a PTC element. The macromolecule-based conductive composite material comprises: a macromolecule base material, having a volume fraction of the macromolecule base material of 20%-75%; a conductive filler with a core-shell granule structure and dispersed in the macromolecule base material, having a volume fraction of 25%-80%; and a coupling agent, being a titanate coupling agent and accounting for 0%-5% of the volume of the conductive filler. The PTC element prepared by using the macromolecule-based conductive composite material comprises at least two metal electrode plates (12, 12?), a macromolecule-based conductive composite material (11) being closely combined with the metal electrode plates (12, 12?). The PTC element prepared from the macromolecule-based conductive composite material has the advantages of low room-temperature resistivity, outstanding weather durability, good voltage resistance and good resistor repeatability.
    Type: Application
    Filed: December 24, 2012
    Publication date: November 6, 2014
    Inventors: Quanquan Yang, Zhengping Liu, Yong Fang, Yutang Liu, Lifeng Liu, Wei Wang, Daohua Gao, Xuan Gong, Jun Wang
  • Patent number: 8880891
    Abstract: A method, a system, and an apparatus for establishing communication are disclosed. The method is invented to establish communication between at least two communication parties including a first communication party and a second communication party. The method includes: sending a Cryptographically Generated Address (CGA) request to the first communication party; receiving CGA parameters and a CGA signature returned by the first communication party; and authenticating the CGA parameters and the CGA signature, and establishing communication with the first communication party if the authentication succeeds. By using the method disclosed herein, in the process of establishing communication, the communication party authenticates the CGA parameters and CGA signature carried in the CGA extension header to determine authenticity of the CGA, thus preventing the IP address spoofing and preventing or mitigating the network security problems caused by the IP address spoofing.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: November 4, 2014
    Assignee: Chengdu Huawei Symantec Technologies Co., Ltd.
    Inventors: Lifeng Liu, Dong Zhang
  • Patent number: 8769287
    Abstract: A communication system that obtains a key includes: a server that confirms support of Identity Based Encryption (IBE) authentication; the server obtains public parameters and a private key for IBE; and the server receives a PreMasterSecret key encrypted through the IBE, and obtains a plain text of the PreMasterSecret key according to the public parameters and the private key. The system includes a client and a server. The client includes an IBE negotiating module, a public parameter obtaining module, a server identifier obtaining module, and a processing module. The server includes an IBE negotiating module, a public parameter obtaining module, a private key obtaining module, and a processing module. Through combination of the IBE technology and the SSL/TLS technology, the modes of encrypting a PreMasterSecret key in the existing SSL/TLS protocol are diversified, and the use scope of the existing SSL/TLS protocol is extended substantially.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: July 1, 2014
    Assignee: Chengdu Huawei Symantec Technologies Co., Ltd.
    Inventors: Min Huang, Lifeng Liu, Shi Wan
  • Publication number: 20140118500
    Abstract: This invention provides a system and method for determining correspondence between camera assemblies in a 3D vision system implementation having a plurality of cameras arranged at different orientations with respect to a scene involving microscopic and near microscopic objects under manufacture moved by a manipulator, so as to acquire contemporaneous images of a runtime object and determine the pose of the object for the purpose of guiding manipulator motion. At least one of the camera assemblies includes a non-perspective lens. The searched 2D object features of the acquired non-perspective image, corresponding to trained object features in the non-perspective camera assembly can be combined with the searched 2D object features in images of other camera assemblies, based on their trained object features to generate a set of 3D features and thereby determine a 3D pose of the object.
    Type: Application
    Filed: October 24, 2013
    Publication date: May 1, 2014
    Applicant: Cognex Corporation
    Inventors: Lifeng Liu, Aaron S. Wallack, Cyril C. Marrion, JR., David J. Michael
  • Patent number: 8600192
    Abstract: This invention provides a system and method for determining correspondence between camera assemblies in a 3D vision system implementation having a plurality of cameras arranged at different orientations with respect to a scene, so as to acquire contemporaneous images of a runtime object and determine the pose of the object, and in which at least one of the camera assemblies includes a non-perspective lens. The searched 2D object features of the acquired non-perspective image, corresponding to trained object features in the non-perspective camera assembly, can be combined with the searched 2D object features in images of other camera assemblies (perspective or non-perspective), based on their trained object features to generate a set of 3D image features and thereby determine a 3D pose of the object. In this manner the speed and accuracy of the overall pose determination process is improved. The non-perspective lens can be a telecentric lens.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: December 3, 2013
    Assignee: Cognex Corporation
    Inventors: Lifeng Liu, Aaron S. Wallack, Cyril C. Marrion
  • Publication number: 20130315242
    Abstract: The present invention provides a network communication method and device. The method includes: receiving, by a VNC on a physical host, a network communication packet sent by a first virtual machine of which a host machine is the physical host and which has a mapping relationship with the VNC, where a source address carried in the network communication packet is an address of the first virtual machine, a destination address carried in the network communication packet is an address of a second virtual machine or an address of another physical host; selecting, by the physical host, a VPN network corresponding to the VNC on the physical host according to preset correspondence between the VPN network and the VNC; and sending, by the physical host, the network communication packet through the selected VPN network. The present invention lowers the restriction on setting an IP address of a virtual machine in a VPN.
    Type: Application
    Filed: January 18, 2013
    Publication date: November 28, 2013
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yuchen Wang, Lifeng Liu, Yujia Weng
  • Patent number: 8549286
    Abstract: In the field of communications technology, a method and a system for forwarding data between private networks are provided, which can enable terminals in different private networks to securely communicate with each other by using private network addresses. The method includes the following steps. A Secure Socket Layer (SSL) tunnel to an SSL Virtual Private Network (VPN) device in another private network is established. Address allocation information of the another private network is received through the SSL tunnel. The address allocation information and a mapping relation between the address allocation information and a public network IP address of the SSL VPN device transmitting the address allocation information and a session ID of the SSL tunnel transmitting the address allocation information are saved.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: October 1, 2013
    Assignee: Chengdu Huawei Symantec Technologies Co., Ltd.
    Inventors: Lifeng Liu, Min Huang, Shi Wan
  • Patent number: 8499146
    Abstract: A method for preventing network attacks is provided, which includes: obtaining a data packet, where a source address of the data packet is a cryptographically generated address (CGA); determining that the obtained data packet includes a CGA parameter and signature information; authenticating the CGA parameter; authenticating the signature information according to the authenticated CGA parameter; and sending the data packet to a destination address when the signature information is authenticated. Accordingly, a device for preventing network attacks is also provided. A CGA parameter used by a data packet is directly used to ensure authenticity of a source address of the data packet, thus preventing network attacks performed by counterfeiting the address. In addition, by authenticating signature information, authenticity of identification of a sender of the data packet and bound address of the sender of the data packet are further ensured.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: July 30, 2013
    Assignee: Chengdu Huawei Symantec Technologies Co., Ltd.
    Inventors: Hongyan Feng, Lifeng Liu
  • Patent number: 8477774
    Abstract: A detecting method is provided, which includes extracting an Internet Protocol Identifier value from an obtained data packet. The detecting method may further include searching in a record table containing a correspondence relationship between an Internet Protocol Identifier value and a terminal serial number to determine whether the record table contains an adjacent Internet Protocol Identifier value smaller than the extracted Internet Protocol Identifier value and modifying the adjacent Internet Protocol Identifier value that is smaller than the extracted Internet Protocol Identifier value to be the extracted Internet Protocol Identifier value if the record table contains the adjacent Internet Protocol Identifier value smaller than the extracted Internet Protocol Identifier value. Otherwise, the detecting method may also include, adding a new record of the extracted Internet Protocol Identifier value and the corresponding terminal serial number into the record table.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: July 2, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yang Xin, Lifeng Liu, Zhibin Zheng, Hongliang Zhu, Kai Zhao, Yixian Yang
  • Publication number: 20130128653
    Abstract: A resistive random access memory device, a method for manufacturing the resistive random access memory device, and a method for operating the resistive random access memory device are disclosed. The resistive random access memory device includes a resistive switching memory element including two electrodes and a layer of variable-resistance material between the two electrodes, wherein the layer of variable-resistance material exhibits bipolar resistive switching behavior; and a Schottky diode including a metal layer and a p-doped semiconductor layer which contact each other, wherein the metal layer of the Schottky diode is coupled to one of the two electrodes of the resistive switching memory element. The present disclosure provides the resistive random access memory device operating in bipolar resistive switching scheme.
    Type: Application
    Filed: May 19, 2011
    Publication date: May 23, 2013
    Applicant: Peking University
    Inventors: Jinfeng Kang, Bin Gao, Yuansha Chen, Bing Sun, Lifeng Liu, Xiaoyan Liu
  • Patent number: 8442304
    Abstract: This invention provides a system and method for determining the three-dimensional alignment of a modeled object or scene. A 3D (stereo) sensor system views the object to derive a runtime 3D representation of the scene containing the object. Rectified images from each stereo head are preprocessed to enhance their edge features. 3D points are computed for each pair of cameras to derive a 3D point cloud. The amount of 3D data from the point cloud is reduced by extracting higher-level geometric shapes (HLGS), such as line segments. Found HLGS from runtime are corresponded to HLGS on the model to produce candidate 3D poses. A coarse scoring process prunes the number of poses. The remaining candidate poses are then subjected to a further more-refined scoring process. These surviving candidate poses are then verified whereby the closest match is the best refined three-dimensional pose.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: May 14, 2013
    Assignee: Cognex Corporation
    Inventors: Cyril C. Marrion, Nigel J. Foster, Lifeng Liu, David Y. Li, Guruprasad Shivaram, Aaron S. Wallack, Xiangyun Ye
  • Patent number: 8418242
    Abstract: A method, system, and device for negotiating a security association (SA) on an Internet Protocol version 6 (IPv6) network are disclosed. In this method, the initiator and the responder generate an SA through the interaction of two messages. Compared with the conventional procedure for setting up an SA based on the Internet Key Exchange Protocol (IKE), the interaction procedure in the present invention is simplified significantly. Therefore, the negotiation is faster and more convenient. In addition, with the present invention, cryptographically generated address parameters (CGA Params) are carried in the message and the CGA may be verified so that the invader cannot spoof the address.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: April 9, 2013
    Assignee: Chengdu Huawei Symantec Technologies Co., Ltd.
    Inventors: Dong Zhang, Lifeng Liu