You, Chang Hun2007-08-232011-08-242007-08-232011-08-242007-08-23November 2http://hdl.handle.net/10106/176A huge amount of biological data has been generated by long-term research. It is time to start to focus on a system-level understanding of bio-systems. Biological networks are networks of biochemical reactions, containing various objects and their relationships. Understanding of biological networks is a starting point of systems biology. Multi-relational data mining finds the relational patterns in both the entity attributes and relations in the data. A widely used representation for relational data is a graph consisting of vertices and edges between these vertices. Graph-based data mining, as one approach of multi-relational data mining, finds relational patterns in a graph representation of data. This thesis will present a graph representation of biological networks including almost all features of pathways, and apply the Subdue graph-based data mining system in both supervised and unsupervised settings. This research will also show that the patterns found by Subdue have important biological meaning.ENM.S.