Patents by Inventor Hojung Cha

Hojung Cha 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).

  • Apparatus and method for constructing wireless AP map
    Patent number: 8738043
    Abstract: An apparatus and a method for constructing a wireless AP map are disclosed. An embodiment of the invention provides a method for constructing a wireless AP map at a server connected over a network with a user terminal that includes: receiving wireless signal information collected from each of a plurality of user terminals, where the wireless signal information includes a signal strength of each of a plurality of wireless AP's received by each user terminal; estimating a distance of each of the plurality of wireless AP's by using the wireless signal information; and constructing a wireless AP map by using the estimated distances. Thus, a wireless AP map can be constructed using wireless signal information collected at typical user terminals located within a particular area, without requiring a trained person to recognize the wireless AP positions within the particular area.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: May 27, 2014
    Assignee: Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Hojung Cha, Jahyoung Koo
  • APPARATUS AND METHOD FOR CONSTRUCTING WIRELESS AP MAP
    Publication number: 20120225678
    Abstract: An apparatus and a method for constructing a wireless AP map are disclosed. An embodiment of the invention provides a method for constructing a wireless AP map at a server connected over a network with a user terminal that includes: receiving wireless signal information collected from each of a plurality of user terminals, where the wireless signal information includes a signal strength of each of a plurality of wireless AP's received by each user terminal; estimating a distance of each of the plurality of wireless AP's by using the wireless signal information; and constructing a wireless AP map by using the estimated distances. Thus, a wireless AP map can be constructed using wireless signal information collected at typical user terminals located within a particular area, without requiring a trained person to recognize the wireless AP positions within the particular area.
    Type: Application
    Filed: October 19, 2011
    Publication date: September 6, 2012
    Applicant: Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Hojung Cha, Jahyoung Koo