Temporal representation design principles: An assessment in the domain of liver transplantation
Aliferis CF, Cooper GF. Temporal representation design principles: An assessment in the domain of liver transplantation. In: Proceedings of the Annual Symposium of the American Medical Informatics Association (1998) 170-174. PMID: 9929204
Time modeling is an important aspect ofmedical decision-support systems engineering. At the core of effective time modeling lies the challenge ofproper knowledge representation design. In thispaper, we focus on two importantprinciplesfor effective timemodeling languages: (a) hybridtemporal representation, and (b) dynamic temporal abstraction. To explore the significance ofthese design principles, we extend apreviously-deflnedformalism (single-granularity modifiable temporal beliefnetworks - MTBN-SGs) to accommodate multiple temporal granularities and dynamic query anddomain-specific model creation. We call the newformalism multiplegranularity MTBNs (MTBN-MGs). We develop a prototype systemfor modeling aspects ofliver transplantation and analyze the resulting model with respect to its representation power, representational tractability, and inferential tractability. Our experiment demonstrates that the design of formalisms is crucialfor effective time modeling. In particular: (i) Hybrid temporal representation is a desirable property oftime-modeling languages because it makes knowledge acquisition easier, and increases representational tractability. (ii) Dynamic temporal abstraction improves inferential andrepresentational tractability significantly. We discuss a high-levelprocedurefor extending existing languages to incorporate hybrid temporal representation anddynamic temporal abstraction.