Abstract:
PURPOSE: A user query processing method for a space database and change method of the space database are provided to offer a high quality location based service to a user by supporting an accurate query processing method for a change result database. CONSTITUTION: A data distribution change unit(212a) divides an original space database into one or more division areas. The data distribution change unit changes the data distribution of the space database divided into the division areas. A line symmetry change unit(212b) symmetrically move coordinate information within the space database which the data distribution is changed. An error insertion unit(212c) inserts errors into coordinate information of a result which symmetrically moved based on the established error rates. The error insertion unit stores the coordinate information including the errors in a change result database corresponding to the original space database.
Abstract:
본 발명은 아웃소싱 데이터베이스에서의 위치 데이터 프라이버시 보전 시스템 및 방법에 관한 것으로, 상기 방법은 암호화된 HAI(Hilbert Aggregation Index)와 TDI(Transformed Data Index))를 저장 및 제공하는 서비스 제공 서버; 힐버트 커브를 이용하여 위치 데이터에 대응되는 HAI와 TDI를 생성한 후 암호화하여 상기 암호화된 HAI와 TDI를 생성한 후 상기 서비스 제공 서버에 업로드하고, 상기 암호화된 HAI와 TDI에 대응되는 복호화키를 생성 및 제공하는 데이터 소유 단말; 및 상기 데이터 소유 단말에 접근하여 상기 복호화키를 획득하고, 상기 서비스 제공 서버에 접근하여 상기 암호화된 HAI와 TDI를 획득한 후, 상기 복호화키를 통해 상기 암호화된 HAI와 TDI를 복호화하여 질문 영역에 대응되는 위치 데이터를 파악하는 데이터 사용 단말;을 포함할 수 있다.
Abstract:
Provided are a k-nearest neighbor query processing system and a method thereof. The method according to an embodiment of the present invention comprises: searching for the nearest representative POIs at a query point; requesting and receiving sample POIs among the POIs in the domain of the nearest representative POIs; labeling the sample POIs which are the k-th nearest neighbors of the query point among the received sample POIs as the k-nearest POIs; setting the query area by using at least one set of the nearest representative POIs or the k-nearest POIs; searching for other representative POIs in the set query area; and resetting the query area using the representative POIs of the last search, improving the speed of the query process thereby. [Reference numerals] (100) Data owner server; (200) Service provider server; (300) Authenticated user terminal; (S510) Road network, Representative POI node, Distance between the representative POI nodes, OPE encryption key; (S520) Search for the nearest representative POIs; (S530) Request sample POIs in the domain of the nearest representative POIs; (S540) Receive the sample POIs; (S550) Search the k-nearest POIs, which are the k-th nearest neighbors, among the sample POIs; (S560) Set a query area with reference to a query point, the representative POIs, and the k-nearest POIs; (S570) Search other representative POIs in the query area; (S580) Reset the query area by repeating the above steps for the searched representative POIs; (S590) Query area with OPES; (S600) Candidate POI set
Abstract:
A cosine similarity based expert recommendation method using a hybrid collaborative filtering technique which calculates the similarity between an expert's attributes (i.e. specialties and field of interest) and the experts and recommends those experts related to a user is disclosed. A high-precision image matching device and a method thereof using skin markers and inbody feature points, as an example, is capable of performing an expert recommendation process based on a score estimation method when the volume of data stored in an expert database is insufficient, improving the quality of recommendation by applying weight based on the activities (i.e. papers, career, etc.) of an expert in order to determine the expert's expertise, and allowing an SNS user to communicate and work with others regarding his/her field of interest by getting a recommendation about the experts regarding his/her field of interest. [Reference numerals] (AA) User information;(BB) Recommendation score table;(CC) Score estimation table;(DD) Ranking;(EE) Verification;(FF) Expert recommendation
Abstract:
본 발명의 실시 예들은 공간 정보를 저장하는 공간 데이터베이스를 공격자로부터 보호하기 위하여 변환하는 방법에 관련되고, 사용자가 그 변환된 공간 데이터베이스에 접근하고 검색할 수 있는 환경을 제공하는 방법에 관련된다. 데이터 소유자는 원본 데이터베이스를 보호하기 위한 변환 결과 데이터베이스를 구축할 수 있고, 사용자는 원본 데이터베이스에 대한 질의를 변환 결과 데이터베이스에 대하여 실시할 수 있다.