Document Type


Date of Award

Spring 5-31-2004

Degree Name

Doctor of Philosophy in Computing Sciences - (Ph.D.)


Computer Science

First Advisor

Jason T. L. Wang

Second Advisor

Narain Gehani

Third Advisor

James A. McHugh

Fourth Advisor

Frank Y. Shih

Fifth Advisor

Vincent Oria

Sixth Advisor

Michael M. Yin


As databases become more pervasive through the biological sciences, various data quality concerns are emerging. Biological databases tend to develop data quality issues regarding data legacy, data uniformity and data duplication. Due to the nature of this data, each of these problems is non-trivial and can cause many problems for the database. For biological data to be corrected and standardized, methods and frameworks must be developed to handle both structural and traditional data.

The BIG-AJAX framework has been developed for solving these problems through both data cleaning and data integration. This framework exploits declarative data cleaning and exploratory data mining to help improve biological data quality. Within the framework, the problems and difficulties for cleaning biological data are discussed, specifically concerning phylogenetic data. Subsequently, it is demonstrated how BIG-AJAX can be used to improve the quality of the data in phylogeny. Moreover, within the cleaning architecture, data integration plays a key role in improving data quality. Data integration, due to the distributed and heterogeneous nature of the data sets becomes an enabling technology for improving data quality.

From these concepts, two tools have been built, BIG-AJAX for TreeBASE and BIG-AJAX for Lineage Paths. Each system approaches the data quality problem using the conceptual BIG-AJAX framework while implementing different methods working within the framework to improve the data quality.



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