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Fast Semantic Duplicate Detection Techniques in Databases

Journal of Software Engineering and Applications 2017年第6期10卷 529-545页

作者： ibrahim moukouop nguena Amolo-Makama Ophélie Carmen Richeline National Advanced School of Engineering University of Yaounde I Yaounde Cameroon Computer Sciences Department University of Yaounde I Yaounde Cameroon

Semantic duplicates in databases represent today an important data quality challenge which leads to bad decisions. In large databases, we sometimes find ourselves with tens of thousands of duplicates, which necessitates an automatic deduplication. For this, it is necessary to detect duplicates, with a fairly reliable method to find as many duplicates as possible and powerful enough to run in a reasonable time. This paper proposes and compares on real data effective duplicates detection methods for automatic deduplication of files based on names, working with French texts or English texts, and the names of people or places, in Africa or in the West. After conducting a more complete classification of semantic duplicates than the usual classifications, we introduce several methods for detecting duplicates whose average complexity observed is less than O(2n). Through a simple model, we highlight a global efficacy rate, combining precision and recall. We propose a new metric distance between records, as well as rules for automatic duplicate detection. Analyses made on a database containing real data for an administration in Central Africa, and on a known standard database containing names of restaurants in the USA, have shown better results than those of known methods, with a lesser complexity.

关键词： Semantic Duplicate Detection Technique Detection Capability Automatic Deduplication Detection Rates and Error Rates

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Automatic Synchronization of Common Parameters in Configuration Files

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Journal of Software Engineering and Applications 2015年第4期8卷 192-200页

作者： Moupojou Matango Emmanuel moukouop nguena ibrahim Department of Computer Science University of Yaounde 1 Yaounde Cameroon National Advanced School of Engineering Department of Computer Science University of Yaounde 1 Yaounde Cameroon

In an information system, applications often make use of services that they access using the parameters described in their configuration files. Various applications then use different codes to denote the same parameters. When access parameters of a service are modified, it is necessary to update them in every configuration file using them. These changes are necessary, for example because of security policies involving regular changes of passwords, or departure of some system administrators. The database password could be changed for example. When system administrators can not immediately identify all services affected by a change or when they feel they don’t have the skills to edit these files, these parameters remain unchanged, creating critical security flaws. This was observed in more than 80% of the organizations we studied. It then becomes necessary to ensure automatic synchronization of all affected files when changing certain settings. Conventional synchronization solutions are difficult to apply when the relevant applications have already been developed by third parties. In this paper, we propose and implement a solution to automatically update all configuration files affected by a change, respecting their structure and codification. It combines a parameters database, a mapping between the configuration files parameters codes and those of the database, and templates for the generation of files. It achieves the objective for all non-encrypted configuration files.

关键词： System Administration Configuration File Parameter Update Synchronization

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