Patents by Inventor Yongjie Cai

Yongjie Cai 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).

  • Automatically learning signal strengths at places of interest for wireless signal strength based physical intruder detection
    Patent number: 9659474
    Abstract: A method for intruder detection is provided. The method includes determining received signal strength of a first wireless device, while the first wireless device is moved at random within a region and generating a profile of the received signal strength of the first wireless device. The method includes determining received signal strength of a second wireless device and issuing an alert, responsive to received signal strength of the second wireless device meeting the profile. An intruder detection system is also provided.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: May 23, 2017
    Assignee: Symantec Corporation
    Inventors: Anand Kashyap, Yongjie Cai, Qiyan Wang
  • Leveraging neighbors' wireless access points in wireless-signal-variation-based physical intruder detection systems
    Patent number: 9378634
    Abstract: A method for intruder detection is provided. The method includes monitoring, at a wireless sniffer in a building, received signal strength relative to each of a plurality of wireless access points, wherein a first wireless access point of the plurality of wireless access points is located within the building and a second wireless access point of the plurality of wireless access points is located external to the building. The method includes creating a profile of the received signal strength from each of the plurality of wireless access points, during a learn mode and comparing activity of the received signal strength from each of the plurality of wireless access points to the profile, during an intruder detection mode. The method includes issuing a notification, based on the comparing. An intruder detection system is also provided.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 28, 2016
    Assignee: Symantec Corporation
    Inventors: Anand Kashyap, Yongjie Cai, Qiyan Wang