## 4 Implementation and Results
### Implementation Results  
The MES was largely divided into the management, field, production monitoring, mobile, OPC, and AI methods, according to function. Figure 12 shows the MES when divided by function. All processes, such as product production, equipment, quality, manufacturing conditions, outsourcing, and management, were covered by the MES for managers. The on-site MES used an MES in the field to perform certain functions, such as performance processing and conditions management, and monitoring is carried out so that the collected information, such as production status and processing status, could be checked in real time. The mobile MES improved user access to the MES by using a personal digital assistant (PDA). It used OPC to collect equipment data and then ran a series of processes to control the equipment. The AI method performed a non-destructive quality inspection function by measuring the PCB hole sizes. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Field**} & **Key Performance** & **Unit** & **Current** & **Target** & **Weight** & **Remarks** \\  & **Indicator (KPI)** & & & & & \\ \hline \multirow{2}{*}{P} & Facility & \multirow{2}{*}{\%} & \multirow{2}{*}{70} & \multirow{2}{*}{82} & \multirow{2}{*}{0.7} & Laser drilling process, based \\  & Utilization Rate & & & & & on 24 h in a day \\ \multirow{2}{*}{Q} & Process Defect & & & & & \\  & Rate & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The KPIs of facility utilization rate and process defect rate. A flow chart for each major process is shown in Figure 13. The order information was received via phone, messenger, and text and order confirmation entailed photographing and registering customers they entered the customer warehouse. LOT warehousing referred to LOT warehousing registration that used the PDA to register the customer management number and the LOT number using an optical character reader (OCR) function after the LOT check operation, in which the manager could visually confirm whether the customer registration, product, LOT number, and customer management number match was complete. For a product to be issued, the company management number needed to be confirmed, the preprepared items needed to be checked, and the company management number needed to be generated. Import inspection was classified into two types: the visual inspection of defective items to register defect quantity; the measurement inspection of items to register, compare, and confirm product. There were also two types of LOT assignment: C-side assignment, which performed unit assignment after checking the preliminary items but before registering the C-side assignment unit; S-side assignment unit, which performed unit assignment after checking the preliminary items but before registering the S-side assigned unit. When there were no problems after comparing the product, size, and customer size, the C-side preparation for product loading, machining conditions, machining data confirmation, and machining registration was initiated using the PDA. For the C-side process inspection, there were three types of inspection: the first inspection, heavy inspection, and final inspection. Microscopic inspection (visual inspection), surface size measurement inspection, floor size measurement inspection, defect input, and inspections of the PNL display were all performed in each case. Figure 12: A functional diagram of the MES. After the initial inspection, heavy inspection, and final inspection, the quantity of PNL that was being sent out after inspection was checked and, after re-inspection, the completion of C-side processing and the inspection confirmation of the unloaded C-side products were registered using the PDA. When there were no problems after comparing the product, size, and customer size, the S-side preparation for product loading, machining conditions, machining data confirmation, and machining registration was initiated using the PDA.