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    Wireless network based method for detecting presence of metal
    1.
    发明授权
    Wireless network based method for detecting presence of metal 有权

    公开(公告)号：US10261178B2

    公开(公告)日：2019-04-16

    申请号：US14932867

    申请日：2015-11-04

    申请人： SHENZHEN UNIVERSITY

    发明人： Kaishun Wu ,  Yuanchao An ,  Zhong Ming

    IPC分类号： G01S7/41 ,  G01S13/88 ,  G01S13/00

    摘要： A wireless network based method for detecting carrying of metal, comprising: installing a wireless signal transmitting device and a wireless signal receiving device indoors; continuously transmitting to the surrounding, by the wireless signal transmitting device, wireless electromagnetic wave signals; continuously receiving, by the wireless signal receiving device, the wireless electromagnetic wave signals; continuously performing, through a signal abnormity detection system, abnormity analysis to the received wireless electromagnetic wave signals, and if any abnormality is determined, performing further analysis in the next step S5 to wireless electromagnetic wave signals within an abnormal waveband; and S5: extracting, through a date feature analysis system, a feature value of the wireless electromagnetic wave signals within the abnormal waveband, comparing and matching the feature value with features stored in an abnormal feature library, and if the feature of the wireless electromagnetic wave signals matches the feature of metal successfully, triggering an alarm device.

    File storage method, file search method and file storage system based on public-key encryption with keyword search
    2.
    发明授权
    File storage method, file search method and file storage system based on public-key encryption with keyword search 有权

    公开(公告)号：US10769107B2

    公开(公告)日：2020-09-08

    申请号：US16162353

    申请日：2018-10-16

    申请人： SHENZHEN UNIVERSITY

    发明人： Jianqiang Li ,  Min Zhang ,  Sailing Li ,  Zhong Ming

    IPC分类号： G06F21/62 ,  G06F16/14 ,  H04L9/08 ,  H04L29/08 ,  H04L9/06 ,  H04L9/30

    摘要： The invention provides a file storage method, a file search method and a file storage system based on public-key encryption with keyword search. The method comprises: receiving a user file storage request sent from a data possessor, acquiring access control attribute information for access to a user file, security level parameters and a keyword set of the user file, generating a file attribute vector of the user file by means of the access control attribute information and the keyword set, acquiring a public-secret key pair used for encrypting the file attribute vector from a pre-generated key space, encrypting the file attribute vector by means of a public key in the public-secret key pair to obtain a ciphertext corresponding to the file attribute vector, and transmitting the ciphertext corresponding to the file attribute vector and a ciphertext of the user file to a preset storage server.

    Sharding block chain generation method based on tree structure
    3.
    发明授权
    Sharding block chain generation method based on tree structure 有权

    公开(公告)号：US11375010B2

    公开(公告)日：2022-06-28

    申请号：US16972988

    申请日：2018-07-25

    申请人： SHENZHEN UNIVERSITY

    发明人： Shubin Cai ,  Ningsheng Yang ,  Zhong Ming

    IPC分类号： H04L67/1061 ,  H04L9/32 ,  H04L67/104 ,  H04L67/1074 ,  H04L9/00

    摘要： Disclosed is a sharding block chain generation method based on a tree structure. Method comprises: dividing a server system into at least one group, and respectively selecting a leader of each group; packaging to generate at least one block by leader according to an own local database state, and broadcasting at least one block to all members of group in which leader is located; verifying consistency of at least one block, executing block according to a verification result of consistency, and synchronizing block to other groups. According to method, by means of tree grouping architecture, efficiency of generating block by a block chain framework is improved, block is generated according to own local database state of the leader, a resource waste phenomenon when block is generated in system is reduced, and delay when the block is generated is reduced.