HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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1.15% can be achieved (Figure 45a). A standardized receiver operating characteristic (ROC) curve (Figure 45b), defined as the plot of the true positive rate (TPR) against the FAR at various threshold settings, is calculated and gives an enclosed area of 0.9967, indicating a very good classifier. Figure 45. Classifier performance. (a) Plot of FAR and FRR with respect to different threshold values. (b) The ROC curve of the customized classifier. Reproduced with permission.151 Copyright 2018, Elsevier. To quantify the difference of users’ typing patterns with varying combinations of feature types, a difference score between two typing inputs is introduced based on the normalized interval distance.188, 189 It is defined as N f S=Sf (i),f (i) = i=1 the contribution to the difference score from the feature i. The difference score between inputs from the same user and different users is plotted in Figure 44d. Ideally the scores across the diagonal should be much lower (more blue) compared to the rest to indicate that the inputs from the same user differ significantly less than those across users. Clearly the N f f 1 (i) − f 2 (i) 1 (21) 12  i=1 f (i) where f(i) isthevalueoffeaturei, Nf isthetotalnumberoffeatures,and Sf1(i),f2(i) is 118

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