## 2 Experimental Setup and Processing Methods  
### Shaking Table Test  
In general, the shaking table test is performed in order (1) to identify the dynamic characteristics of the target structure system, and (2) to obtain a validated analytical model. It can also be used (3) to verify the durability of the structure, and (4) to diagnose and maintain the integrity of the structure. Changes in the vibration characteristics of a structure often indicate a problem related to the structural integrity of the structure. For example, when a structure is subjected to a load and reaches fracture, a crack occurs. In this case, the natural frequency is significantly different from the case in which there is no crack. Therefore, if there is a significant change in the natural frequency, it can be predicted that the safety of the structure is likely to be a problem [27; 28; 29; 30; 31].  
In this study, the shaking table test was performed in order to verify the method used to convert acceleration data into velocity and displacement.  
Figure 2 shows the shaking table test of a high-rise building. The shaking table test consists of a shaking table, a scale model consisting of 10 stories above ground and three stories below, as well as four accelerometers and a high-speed camera. The displacements of the high-rise building were estimated by analyzing images taken by a high-speed camera. The acceleration data measured by the accelerometer were then converted into displacement and compared with the displacement by image analysis. Figure 2c shows a model of a shaking table and a high-rise building. The height of the model is 147.2 cm, the height above the ground surface (upper part) is 113.0 cm, and the depth below the ground surface (lower part) is 34.2 cm. The lower part is a square of 40 cm \(\times\) 40 cm, and the upper part is a square of 20 cm \(\times\) 20 cm. The accelerometer was installed at the base, 4 th floor, 7 th floor, and roof. The shaking table test was conducted by KICT (Korea Institute of Civil Engineering and Building Technology) in May 2018 at Smart C & S (Control & Sensing) in Daejeon, Korea. The model of the high-rise building was made without scale because there was no actual reference structure.  
The input seismic waves were scaled considering the natural frequencies of the model, 1 st = 2.8230 Hz, 2 nd = 8.7980 Hz, and 3 rd = 14.6990 Hz.  
The accelerometer used in the shaking table test was iLOG-MEMS-ACC, which is developed and sold by Smart C & S as shown in Figure 3. iLOG-MEMS-ACC is a wireless acceleration sensor system that rapidly sends (115.2 kbps) acceleration signals without noise, using Bluetooth. The sensor device consists of a 2-axis MEMS acceleration sensor, a 16 bit A/D convertor, an 8 bit micro-controller, internal memory (2.0 MB), a Bluetooth communication module, and a Li-ion recharge module, which allows  
Figure 2: Shaking table test for verification of displacement conversion method of acceleration data; (a) Photo of experimental equipment; (b) 3D drawing; (c) 2D drawing.  
self-acquisition of the acceleration signal, as well as decision-making according to an embedded algorithm. The detailed specifications of iLOG-MEMS-ACC are shown in Table 1.