# A Blockchain-Based Quality 4.0 Application for Warehouse Management System
## 5 Application
### Blockchain Application
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Process** & **Product Transactions** & **Current Stock System** & **Quality 4.0-Stock System** \\ \hline \multirow{7}{*}{Controllability of Quality} & Waiting period of products in the warehouse & Manual checks are made to ensure that the product’s waiting time in the warehouse is not exceeded. & When the waiting period for the products in the warehouse is \\ \cline{2-4}  & The placement process of products in the warehouse & Control of the placement of products in the warehouse can only be noticed during relocation. & Layout control in the warehouse is listed with QR codes. Regular shelf checks are carried out at specific intervals. \\ \cline{2-4}  & \multirow{3}{*}{Processes of products entering and exiting the warehouse} & The product is checked with barcodes at entry and exit. & In controls made with QR codes, timeout information can be checked. \\ \cline{2-4}  & \multirow{3}{*}{Comparison with the previous period} & - & A comparison of the duration of the processes can be made through the system. \\ \cline{2-4}  & \multirow{3}{*}{Ensuring continuity of processes} & For the continuity of the processes, monitoring must continue outside the system. & Periodic checks are carried out regularly to ensure process continuity. \\ \cline{2-4}  & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Benchmarking for technology criteria. \begin{table}
\begin{tabular}{c c c c} \hline
**Eonomy** & **Product Transactions** & **Current Stock System** & **Quality 4.0–Stock System** \\ \hline \multirow{6}{*}{Purchasing a product from a supplier} & Notifications are sent through the application used for orders from suppliers. Anyone who enters the system can see this and make changes. & Orders from suppliers can be transmitted to authorized persons with the cryptographic structure created by blockchain, and only authorized persons can take action regarding the approval, cancelation, and change in this order. & Orders from suppliers can be transmitted to authorized persons with the cryptographic structure created by blockchain, and only authorized persons can take action regarding the approval, cancelation



According to the process quality component comparison between the current system and the proposed system given in Table 12, the main difference is in the warehouse's monitoring and control of waiting times. While monitoring and control are carried out manually in the current system, these times can be viewed and controlled from the network structure with the BC algorithms of the Q-4.0 model. If there is a problem and it is necessary to intervene in subsequent processes, it can intervene quickly. According to the technology quality component comparison between the current and proposed systems in Table 13, the two systems are similar regarding product entry, exit, and product inquiry. However, while the movements of the products after leaving the warehouse cannot be tracked in the current system, they can be tracked with the recommended Q-4.0 model. In addition, while efficiency calculations cannot be made in the current system, real-time efficiency calculations can be made in the proposed Q-4.0 model, as the current capacity and occupancy rate can be seen instantly. Table 14 compares the employee quality component between the current and proposed systems. Work has yet to be conducted on the employee quality component in the current system. The employee list prepared for product purchase, sale, and shipment is recorded in a document separate from the warehouse management system. The list has yet to be transferred to the existing warehouse management system. Information about all employees is available in the BC base of the proposed Q-4.0 model. Employee movements and changes can be viewed and reported in real-time.