Affiliations: Department of Information Science & Technology, Anna University, Chennai, Tamil Nadu, India
Note: [] Corresponding author. R. Sethukkarasi, Department of Information Science & Technology, Anna University, Chennai-600025, Tamil Nadu, India. E-mail: sethumaaran@yahoo.co.in
Abstract: Representation of temporal knowledge and analysis of temporal data is becoming a good practice for effective classification and prediction. Various semantic levels on knowledge representation schemes have been measured for temporal data. The existing Fuzzy Cognitive Maps (FCMs) facilitate modeling dynamic systems for knowledge representation and reasoning under uncertainty. However, the FCMs are constructed manually and are constrained by the human experts' validation for assessing its reliability and they are lacking in considering temporal features necessary for reasoning in medical applications. This paper proposes a new temporal mining system known as Fuzzy Temporal Cognitive Map (FTCM), which defines a complete discrete temporal extension and fuzzy inference mechanism of FCM. In FTCM, the temporal dependencies of concepts during a particular time interval are measured. This work aims to reduce the complexities of dynamic modeling of a complex causal system by proposing a four layer fuzzy neural network to construct FTCM from the temporal data. In this proposed model, a fuzzy temporal mutual subsethood operator is used to measure the activation spread in the FTCM for automatic quantification of causalities. This FTCM is designed for a set of temporal clinical records, which can be further used for inferencing and prediction in medical diagnosis by generating a set of fuzzy temporal rules using Allen's temporal relationships and fuzzy temporal rules.
Keywords: Fuzzy Temporal Cognitive Maps (FTCMs), knowledge representation, temporal data mining, fuzzy reasoning, fuzzy temporal rules, neuro fuzzy inference system
