## 3 Materials and Methods
### Apply PCA with Derived AHP-QFD Matrices
#### 3.3.1 Dataset Description
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & **X1** & **X1** & **X1** & **X1** & **X1** & **X1** & **X1** & **X1** & **X1** & **X1** \\  & **FR1** & **FR2** & **FR3** & **FR4** & **FR5** & **FR6** & **FR7** & **FR8** & **FR9** & **FR10** & **FR11** & **FR12** & **FR13** & **FR14** \\ \hline X2 CR1 & 44.46 & 44.46 & 0.00 & 44.46 & 4.94 & 14.82 & 0.00 & 4.94 & 0.00 & 0.00 & 0.00 & 4.94 & 0.00 & 0.00 \\ X2 CR2 & 44.19 & 44.19 & 0.00 & 44.19 & 4.91 & 14.73 & 0.00 & 0.00 & 0.00 & 0.00 & 14.73 & 0.00 & 0.00 \\ X2 CR3 & 0.00 & 0.00 & 0.00 & 0.00 & 41.94 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 \\ X2 CR4 & 0.00 & 0.00 & 44.64 & 4.96 & 0.00 & 0.00 & 0.00 & 14.88 & 0.00 & 0.00 & 0.00 & 4.96 & 44.64 & 0.00 \\ X2 CR5 & 14.52 & 43.56 & 0.00 & 0.00 & 0.00 & 14.52 & 0.00 & 4.84 & 0.00 & 0.00 & 0.00 & 0.00 & 4.84 & 0.00 \\ X2 CR6 & 13.29 & 13.29 & 13.29 & 13.29 & 0.00 & 0.00 & 0.00 & 39.87 & 39.87 & 39.87 & 0.00 & 0.00 & 13.29 \\ X2 CR7 & 0.00 & 0.00 & 11.13 & 0.00 & 0.00 & 33.39 & 11.13 & 33.39 & 33.39 & 33.39 & 0.00 & 11.13 & 11.13 \\ X2 CR8 & 14.61 & 14.61 & 14.61 & 4.87 & 43.83 & 14.61 & 4.87 & 43.83 & 0.00 & 0.00 & 43.83 & 0.00 & 43.83 & 0.00 \\ X2 CR9 & 3.82 & 3.82 & 3.82 & 3.82 & 0.00 & 0.00 & 0.00 & 11.46 & 34.38 & 34.38 & 11.46 & 0.00 & 0.00 & 11.46 \\ X2 CR10 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 44.82 & 0.00 & 14.94 & 0.00 & 0.00 & 0.00 & 4.98 & 44.82 & 0.00 \\ X2 CR11 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 14.07 & 0.00 & 42.21 & 0.00 & 0.00 & 0.00 & 0.00 \\ X2 CR12 & 5.00 & 5.00 & 45.00 & 5.00 & 45.00 & 45.00 & 5.00 & 15.00 & 0.00 & 0.00 & 45.00 & 0.00 & 45.00 & 0.00 \\ X2 CR13 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 31.86 & 10.62 & 10.62 & 0.00 & 0.00 & 0.00 & 0.00 \\ X2 CR14 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 45.00 & 15.00 & 45.00 & 0.00 & 0.00 & 45.00 & 0.00 & 15.00 & 0.00 \\ X2 CR15 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 14.49 & 14.49 & 14.49 & 14.49 & 43.47 & 4.83 & 0.00 & 43.47 \\ X2 CR16 & 45.00 & 45.00 & 45.00 & 45.00 & 45.00 & 5.00 & 5.00 & 45.00 & 0.00 & 0.00 & 15.00 & 0.00 & 45.00 & 0.00 \\ X2 CR17 & 10.05 & 10.05 & 10.05 & 10.05 & 10.05 & 3.35 & 3.35 & 10.05 & 0.00 & 0.00 & 0.00 & 30 \begin{table}
\begin{tabular}{l l l l} \hline \hline \multicolumn{1}{c}{\({}^{\bullet}\)**FR\({}_{\mathbf{i}}\)**} & \multicolumn{1}{c}{**X1**} & \multicolumn{1}{c}{**X2**} & \multicolumn{1}{c}{**X3**} \\ \hline FR1 & Airport land feature & Insulation ability of the inner layer & Material \\ \hline FR2 & Considering airport operating handling cost & Heat reflection ability of the outer layer & Structure \\ \hline FR3 & Airport carrying condition & Anti-shock ability & Wireless \\ \hline FR4 & Closeness to airline agent and customer & Cooling ability & Sealing \\ \hline FR5 & Local political regulation and law & Temperature indicator & Battery capacity \\ \hline FR6 & Improvement district’s working & Ziploc enclosure & Power consumption \\ \hline FR7 & Airport labor status & Carry handle & Appearance \\ \hline FR8 & Airport electrical power/utilities & Bag form & Weight \\ \hline FR9 & Airport information technology status & Weight & Connection wire length \\ \hline FR10 & Size & Diaphrag design \\ \hline FR11 & Medical disposable item \\ \hline FR12 & Reusable \\ \hline FR13 & Safety material \\ \hline FR14 & Price \\ \hline \end{tabular}  
* FR refers to feature requirement i of each dataset.  
\end{table} 
Table 10: The list of feature requirements.