Liu Guo-hua

ESM: An Extended Schema Matching Method between Database Schemas

Schema matching is a basic problem in many application fields as fundamental operation of schema. This paper analyses the advantages and limitations of iMAP and CM, and proposes an extended schema matching system architecture between Database Schemas (ESM). First, ESM filters unreasonable matches by preprocess and clustering process. Then it employs a set of special-purpose searchers to explore a specialized portion of the search space and discover 1:1 and complex matches. Then it estimates candidate matches and selects optimal candidate matches by using similarity estimator and match selector respectively.

EM: An Improved Schema Matching Algorithm in the Update of XML Views

Schema matching, the problem of finding semantic correspondences between elements of two schemas, plays a key role in many applications. Currently, schema matching is largely performed manually by domain experts, thus a time-consuming and labor-intensive process. In this paper, an improved schema matching algorithm is proposed based on Similarity Flooding (SF for short) algorithm, which is an optimized and improved algorithm. It adds a pretreatment, so that the calculation of previous algorithm is decreased greatly, the efficiency and precision of schema matching is enhanced, and implement the semi-automatization of maintenance and management after publishing XML views.

A method of eliminating information disclosure in view publishing

Although it is convenient to exchange data by publishing view, but it may disclose sensitive information. The problem of how to eliminate information disclosure becomes a core problem in the view publishing process. In order to eliminate information disclosure, deciding view security algorithm and eliminating information disclosure algorithm are proposed, and the validity of the algorithms are proved by experiment. The experimental results showing, deciding view security algorithm can decide the safety of a set of views under prior knowledge, and eliminating information disclosure algorithm can eliminate disclosure efficiently.