# A Study on Operator Allocation in Consideration of Fatigue in Cell Manufacturing System +
## 5 Assembly Experiment
### Comparison of Experimental Results  
Table 10 shows the values of the skill index after the end of one order. The shaded cells represent the assigned tasks, and the skill index values have been updated. The values after the computational experiment were calculated from the post-training assembly times obtained using Equation (13) after the completion of the assigned tasks, and the values after the assembly experiment were calculated from the final assembly time. The skill index values after the computational experiment were higher than before. Expert operators reached the maximum value of the skill index (=1.50), Standard operators' values were like the Experts' and Newcomer operators' values were like the Standard operators'. On the other hand, after the assembly experiment, the values of the skill index were higher for the Standard and Newcomer operators than before the start of the work. The values were lower for all but one of the Expert operators. Looking at the differences in the skill index, the largest difference was 0.50 for the expert O1 in Group B, and the smallest \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multirow{3}{*}{**Operator**} & \multirow{3}{*}{**Skill Level**} & \multicolumn{4}{c}{**After the Computer**} & \multicolumn{4}{c}{**After the Assembly**} & \multicolumn{4}{c}{**Difference Value**} \\ \cline{3-14}  & & \multicolumn{3}{c}{**Experiment**} & \multicolumn{3}{c}{**Experiment**} & \multicolumn{3}{c}{**Experiment**} & \multicolumn{3}{c}{**Difference Value**} \\ \cline{3-14}  & & **K1** & **K2** & **K3** & **K4** & **K1** & **K2** & **K3** & **K4** & **K1** & **K2** & **K3** & **K4** \\ \hline \multicolumn{14}{c}{Group A} \\ \hline O1 & Expert & 1.50 & 1.40 & 1.40 & 1.40 & 1.11 & 1.40 & 1.40 & 1.40 & 0.39 & 0.00 & 0.00 & 0.00 & Average of \\ \hline O2 & Expert & 1.50 & 1.40 & 1.40 & 1.40 & 1.30 & 1.40 & 1.40 & 0.20 & 0.00 & 0.00 & 0.00 & differences \\ \hline O3 & Standard & 1.00 & 1.00 & 1.00 & 1.47 & 1.00 & 1.00 & 1.00 & 1.50 & 0.00 & 0.00 & 0.00 & \(-0.03\) & 0.037 \\ \hline O4 & Standard & 1.00 & 1.00 & 1.47 & 1.00 & 1.00 & 1.00 & 1.34 & 1.00 & 0.00 & 0.00 & 0.13 & 0.00 & S.D. \\ \hline O5 & Standard & 1.00 & 1.47 & 1.00 & 1.00 & 1.00 & 1.14 & 1.00 & 1.00 & 0.00 & 0.33 & 0.00 & 0.00 & 0.128 \\ \hline O6 & Newcomer & 0.70 & 1.01 & 1.01 & 1.01 & 0.70 & 0.78 & 1.22 & 1.19 & 0.00 & 0.23 & \(-0.21\) & \(-0.18\) & \(t\)-test \\ \hline O7 & Newcomer & 1.02 & 1.03 & 0.70 & 0.70 & 0.74 & 0.90 & 0.70 & 0.70 & 0.28 & 0.13 & 0.00 & 0.00 & \(p\)-value \\ \hline O8 & Newcomer & 0.70 & 0.70 & 1.03 & 1.03 & 0.70 & 0.70 & 1.04 & 1.12 & 0.00 & 0.00 & \(-0.01\) & \(-0.09\) & 0.118 \\ \hline \multicolumn{14}{c}{Group B} \\ \hline O1 & Expert & 1.50 & 1.40 & 1.40 & 1.40 & 1.00 & 1.40 & 1.40 & 1.40 & 0.50 & 0.00 & 0.00 & 0.00 & Average of \\ \hline O2 & Expert & 1.50 & 1.40 & 1.40 & 1.50 & 1.50 & 1.40 & 1.40 & 1.50 & 0.00 & 0.00 & 0.00 & 0.00 & differences \\ \hline O3 & Standard & 1.44 & 1.00 & 1.00 & 1.47 & 1.11 & 1.00 & 1.00 & 1.47 & 0.33 & 0.00 & 0.00 & 0.00 & 0.039 \\ \hline O4 & Standard & 1.46 & 1.00 & 1.00 & 1.00 & 1.25 & 1.00 & 1.00 & 1.00 & 0.21 & 0.00 & 0.00 & 0.00 & S.D. \\ \hline O5 & Standard & 1.00 & 1.44 & 1.00 & 1.00 & 1.00 & 1.33 & 1.00 & 1.00 & 0.00 & 0.11 & 0.00 & 0.00 & 0.113 \\ \hline O6 & Newcomer & 0.70 & 0.70 & 1.01 & 0.70 & 0.70 & 0.70 & 0.95 & 0.70 & 0.00 & 0.00 & 0.06 & 0.00 & \(t\)-test \\ \hline O7 & Newcomer & 0.70 & 1.01 & 1.01 & 1.01 & 0.70 & 1.02 & 1.09 & 1.02 & 0.00 & \(-0.01\) & \(-0.06\) & \(-0.01\) & \(p\)-value \\ \hline O8 & Newcomer & 0.70 & 1.02 & 1.02 & 1.02 & 0.70 & 0.97 & 0.89 & 1.06 & 0.00 & 0.05 & 0.13 & \(-0.04\) & 0.057 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Changes in the skill index. Figure 7: Example of a parts box. difference was 0.00 for the skilled O2 in Group B. Additionally, it was found that the differences varied depending on the task, even for the same operator, indicating that the learning rate changes based on the type of work.