## 5 Conclusions  
This study developed the port COBie schema and BIM environment-based input system to transfer data generated from the design and construction phases to the operation phase, as well as to integrate and manage data generated in the operation phase into the BIM environment. This study was carried out in order to overcome the real problem that the maintenance of port facilities is being performed in the existing traditional method rather than using digital-based data, and that facility maintenance cannot be managed in the BIM environment when it is converted to the BIM environment. Maintenance data are not generated only in the maintenance phase, but also occurs in the design and construction phases. One of the purposes of COBie, which is currently used in the field of building facilities, is to transmit maintenance data generated in the design and construction stages to the maintenance stage after the project is completed. COBie data are based on BIM model data, thus it has the advantage of being able to utilize BIM data in the maintenance stage. Therefore, in this study, the port facility maintenance data format was developed in the form of a COBie schema, and an input system was created to implement it in the BIM environment. The input system based on port COBie schema that can input and save port COBie data in the BIM environment was implemented by using Dynamo to parameterize each property of COBie as a parameter of the BIM model. Because each property of COBie was implemented as a parameter, a system was established in which the COBie data, operation information, and shape and property information of the model could be converted when the BIM model was converted to an IFC-based model, the standard format for open BIM. This allowed us to check each object in the model or the operation history information of the facility alongside the BIM model of the port facility, using the port IFC viewer, which remains to be developed in the future. Because COBie data were included in the IFC model, data for each period could be extracted from the History or Performance worksheets of the developed port COBie spreadsheet and expressed as time-series data, which is for visually demonstrating the change in the extent of port facilities. The port COBie schema developed in this study and the COBie data input system based on it were not yet attempted research fields before this research. There have been studies to manage port facilities based on BIM, but studies to manage them based on COBie have not been conducted. This study was improved for port facilities based on the COBie schema used in the field of existing building facilities, aimed at the standard data exchange format for port facility maintenance by complying with the rules of the existing COBie schema. Whilst the COBie schema and input system developed in this study could display and manage the COBie data in the BIM environment, they could not re-export the COBie data in  
Figure 19: The last step of port COBie System, the output of port COBie spreadsheet. the form of a spreadsheet. Another limitation of this study is that it failed to verify the port COBie schema and COBie input system developed in this study. Although the COBie input system and COBie data output system for port facilities were established through system implementation, it was not verified whether this system really had effectiveness in the port project. Therefore, as a follow-up study of this study, it is necessary to apply the port COBie schema and input system developed in this study on a trial basis to the actual port project. The last limitation was that the system could not cover the entire port facility. Despite such limitations, this study is significant in that it establishes a system that can manage port facility management data in a BIM environment, facilitating digital twin-based port facility management.