## 4 Performance and Economic Feasibility of a Retaining Wall Displacement Measurement System
### Economic Feasibility of System
#### 4.2.2 Setting of LCC Analysis Variables and Assumptions
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & **Input Cost** & \multicolumn{3}{c}{**Conventional Method**} & \multicolumn{3}{c}{**Automated Method**} \\ \hline \multirow{10}{*}{Labor cost} & **Item** & **Unit Cost** & **Quantity** & **Cost** & **Quantity** & **Cost** \\ \hline \multirow{10}{*}{Labor cost} & Intermediate technician & $169.18/person & 0.40 person & $67.67 & 0.40 person & $67.67 \\  & Special worker & $140.42/person & 0.80 person & $112.34 & - & $0 \\  & Ordinary worker & $112.17/person & 1.60 person & $179.47 & 0.13 person & $141.58 \\  & Intermediate skilled technician & $142.07/person & 0.80 person & $113.66 & - & $0 \\  & Steebrworker & $158.18/person & - & $0 & 0.34 person & $53.78 \\  & Welder & $174.26/person & - & $0 & 0.17 person & $29.62 \\  & Construction machine operator & $168.06/person & - & $0 & 0.04 person & $6.72 \\  & Labor cost per installed unit (\$/number of units) & \$473.13/number of units & \$172.38/number of units \\ \hline \multirow{10}{*}{Material cost} & Inclinometer casing & $8.76/m & 6 m & $52.55 & - & $0 \\  & (Boring depth + 1 m) & Protective box & $72.99/box & 1 box & $72.99 & - & $0 \\  & Miscellaneous materials & & & & & \\  & (\% of the sum of inclinometer casing & $125.55 & 5\% & $6.28 & - & $0 \\  & and protective box) & & & & & \\  & Material cost per installed unit (\$/number of units) & \$131.82/number of units & \$0/number of units & \$0/number of units \\ \hline \multirow{2}{*}{Equipment cost} & Crane & $51.72/h & - & $0 & 0.29 h & $15.00 \\  & Equipment cost per installed unit (\$/number of units) & \$0/number of units & \$15.00/number of units & \$15.00/number of units \\ \hline \multirow{2}{*}{Work cost per installed unit (\$/number of measuring instruments) = labor} & \multirow{2}{*}{\$604.96/number of units} & \multirow{2}{*}{\$187.38/number of units} & \multirow{2}{*}{\$187.38/number of units} \\  & cost + material cost + equipment cost & & & & \\  & Installation cost (\$) = work cost per installed unit \(\times\) number of measuring instruments & \$1209.92 & \$187.38 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Costs for the inclinometer casing (conventional method) and hardware installations (automated method). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Input Cost** & \multicolumn{3}{c}{**Conventional Method**} & \multicolumn{3}{c}{**Automated Method**} \\ \hline \multirow{10}{*}{Labor cost} & **Item** & **Unit Cost** & **Quantity** & **Cost** & **Quantity** & **Cost** \\ \cline{2-6}  & Intermediate technician & $169.18/person & 0.10 person & $16.92 & - & $0 \\  & Special worker & $140.42/person & 0.20 person & $28.08 & - & $0 \\  & Beginner technician & $133.28/person & 0.20 person & \$26.66 & 0.20 person & \$26.66 \\  & Labor cost per measurement & \$71.66 & & & \$26.66 \\ \hline \multirow{2}{*}{Material cost} & Cost of using the inclinometer & \$14.06 & 0.20 & \$2.81 & - & $0 \\  & Material cost per measurement & \$2.81 & & \$0 & \\ \hline \multirow{2}{*}{Work cost per measurement (\$/number of measurements) = labor} & \multirow{2}{*}{\$74.47/number of measurements} & \multirow{2}{*}{\$26.66/number of measurements} & \multirow{2}{*}{\$26.66/number of measurements} \\  & cost + material cost & & & & \\ \multicolumn{2}{c}{Inclinometer installation cost (\$) = work cost per measurement \(\times\) number of measurements \(\times\) number of measuring instruments} & \multirow{2}{*}{\$7149.09} & \multirow{2}{*}{\$1279.47} \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Measurement costs for the conventional and automated methods.