## 4 Experimental Results and Analysis
### Experimental Results
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Method** & **CR** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO & none & 0.87451 & 0.86403 & 0.86945 & 0.00373 \\ SSO-DE & 0 & 0.88352 & 0.87259 & 0.87667 & 0.00425 \\ SSO-DE & 0.1 & 0.88604 & 0.86774 & 0.87964 & 0.00573 \\ SSO-DE & 0.4 & 0.89101 & 0.87381 & 0.88531 & 0.00570 \\ SSO-DE & 0.7 & **0.89255** & **0.88666** & **0.89020** & **0.00175** \\ SSO-DE & 1 & 0.89203 & 0.88411 & 0.88900 & 0.00292 \\ \hline \hline \end{tabular}
\end{table} 
Table 18: Comparison of SSO and SSO-DE for spring (autumn). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Method** & **CR** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO & none & 0.89785 & 0.89631 & 0.89712 & **0.00051** \\ SSO-DE & 0 & 0.90194 & 0.88057 & 0.89284 & 0.00605 \\ SSO-DE & 0.1 & 0.89924 & 0.89571 & 0.89760 & 0.00119 \\ SSO-DE & 0.4 & 0.90467 & 0.89419 & 0.89879 & 0.00279 \\ SSO-DE & 0.7 & **0.90822** & 0.89746 & **0.90090** & 0.00306 \\ SSO-DE & 1 & 0.90375 & **0.89794** & 0.89968 & 0.00189 \\ \hline \hline \end{tabular}
\end{table} 
Table 19: Comparison of SSO and SSO-DE for summer. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Method** & **CR** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO & none & 0.82123 & 0.76553 & 0.79320 & 0.02068 \\ SSO-DE & 0 & 0.84873 & 0.83996 & 0.84624 & 0.00270 \\ SSO-DE & 0.1 & 0.85024 & 0.84423 & 0.84729 & 0.00217 \\ SSO-DE & 0.4 & 0.85207 & 0.84736 & 0.84962 & 0.00132 \\ SSO-DE & 0.7 & 0.85219 & 0.84945 & 0.85060 & **0.00092** \\ SSO-DE & 1 & **0.85415** & **0.85031** & **0.85231** & 0.00148 \\ \hline \hline \end{tabular}
\end{table} 
Table 20: Comparison of SSO and SSO-DE for winter. Figure 7: Box and whisker diagram of SSO and SSO-DE for spring (autumn). *: Outliers. Figure 8: Box and whisker diagram of SSO and SSO-DE for summer. *: Outliers. Figure 9: Box and whisker diagram of SSO and SSO-DE for winter. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Method** & **aver.t** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO-DE & **290.13** & 0.91229 & 0.89694 & 0.90068 & 0.00453 \\ PSO-DE & 346.52 & 0.89669 & 0.89596 & 0.89630 & **0.00024** \\ iSSO-DE & 316.00 & 0.89909 & 0.89527 & 0.89741 & 0.00120 \\ ABC-DE & 392.90 & **0.91937** & **0.90098** & **0.90870** & 0.00640 \\ \hline \hline \end{tabular}
\end{table} 
Table 23: Experiment results for winter. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Method** & **aver.t** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO-DE & **325.67** & **0.86408** & **0.84870** & **0.85326** & 0.00487 \\ PSO-DE & 352.56 & 0.84974 & 0.83769 & 0.84481 & **0.00423** \\ iSSO-DE & 335.36 & 0.85175 & 0.83321 & 0.84618 & 0.00772 \\ ABC-DE & 392.40 & 0.84614 & 0.80664 & 0.82205 & 0.01213 \\ \hline \hline \end{tabular}
\end{table} 
Table 24: Experiment results of [PERSON]’s test. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Method** & **aver.t** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO-DE & **361.00** & **0.89162** & 0.88692 & **0.89057** & 0.00159 \\ PSO-DE & 413.88 & 0.89095 & 0.88601 & 0.88872 & 0.00169 \\ iSSO-DE & 383.33 & 0.89098 & 0.88386 & 0.88867 & 0.00315 \\ ABC-DE & 480.32 & 0.89151 & **0.88779** & 0.88985 & **0.00136** \\ \hline \hline \end{tabular}
\end{table} 
Table 21: Experiment results for spring (autumn). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Method** & **aver.t** & **Best** & **Worst** & **Mean** & **Std** \\ \hline SSO-DE & **290.13** & 0.91229 & 0.89694 & 0.90068 & 0.00453 \\ PSO-DE & 346.52 & 0.89669 & 0.89596 & 0.89630 & **0.00024** \\ iSSO-DE & 316.00 & 0.89909 & 0.89527 & 0.89741 & 0.00120 \\ ABC-DE & 392.90 & **0.91937** & **0.90098** & **0.90870** & 0.00640 \\ \hline \hline \end{tabular}
\end{table} 
Table 22: Experiment results for summer.