[Retracted] SWOT: A Hybrid Hardware-Based Approach for Robust Fault-Tolerant Framework in a Smart Day Care

Table 1

Classification of fault diagnosis methods [13, 25–29].

Fault Diagnosis	Model-based	Qualitative	Abstraction hierarchy
			Fault trees
			Digraphs
			Fuzzy
		Quantitative	Analytical redundancy
			Parity space
			Kalman filter
			Parameter estimation
			Diagnostic observers
	Hardware-based	Hardware redundancy
		Voting techniques
		Special
		Limit checking
		Frequency analysis
	History-based	Artificial intelligence	Fuzzy logic neural network
		Clustering	K-means
		Classification	Support machine vectors Bayesian network KNN
		Statistical methods	Parametric; Nonparametric
		Expert systems	Knowledge-Based; Rule-based
		Pattern recognition