**4. EKG-mDFA gadget**

Health wellness monitoring has been advancing in health care and medical applications [14]. We focus our attention to heartbeat checking. **Figure 10** shows lab-made data logging and mDFA computing devices for a real-time detection and measurement. **Figure 10A** shows electrodes for EKG, commercially available, in-hospital use, using for a prematurely born baby in an incubator, Vitrode V, Nihon Koden, Tokyo, Japan. **Figure 10** shows an EKG amplifier, heartbeat-interval calculator and Bluetooth radio transmitter. This EKG amplifier (**Figure 10B**) receives live-body EKG signal from the two terminals (**Figure 10A** and **B**, any two electrodes, the third one is a spare electrode). **Figure 10C** shows an iPod (Apple, USA), which has a computation program mDFA [4, 5]: We incorporated mDFA into an iPod (not for sale). This system (**Figure 10**) is commercially available except for two items: (1) mDFA program and (2) modified electrode attachment (**Figure 10B**). To us, ready-made goods (**Figure 10B**) have the inconvenience for precision recording of the heartbeat signal, because it often fails to detect R-peaks of EKG.

**Figure 12** shows a practical view of iPod touch screen. To start recording, an operator can touch the button (Rec), and then after completing capture of 2000 beats, it automatically

**Figure 10.** EKG logging and mDFA calculation, a real-time detection and measurement.

**Figure 11.** An example of a screen view of an iPod (lab-made, not for sale).

computes SI. As can be seen in the figure, SI is 0.53 (**Figure 11**). Generally, SIs are computed from various box size ranges: [10; 30], [30; 70], [70; 140], [130; 270], [51; 100], [30; 140] and [30; 270] (see [4, 5] in detail). For the final best SI, we take the last one, here, it is 0.531390 [30; 270], as explained in [4, 5]. Computational and mathematical explanations about mDFA are presented in [4, 5].
