The public safety management guidelines were introduced in 2019 and continue to be dedicated to advancing comprehensive measures for public safety management, with a primary focus on prioritizing the safety and well-being of the public within governmental institutions. To achieve this goal, our previous study developed a establishment procedure of risk assessment-based safety inspection system for public institutions that order construction projects and applied it to highway construction projects to evaluate its effectiveness. To enhance the practicality of the establishment procedure, it is essential to collect and analyze feedback from stakeholders regarding its performance and suitability. This study conducted a survey involving 200 participants who had experience with the establishment procedure, and performed statistical analyses to evaluate its performance and applicability. The survey results indicated that the participants reported a high level of satisfaction (scoring 4 and above on a 5-point Likert scale) in several areas: specialization of safety inspection items for different types of work (with a satisfaction rate of 65%), the evaluation process for safety ratings (64.5%), and their willingness to recommend the procedure to other institutions (75.5%). In the factor analysis with Varimax rotation, two factors emerged: (1) a specialization factor related to safety inspection items, and (2) a grading factor associated with safety evaluation results. Regression analyses of these factors unveiled significant positive relationships with improvements in safety and health performance, including the prevention of fatal accidents, heightened safety responsibility, and raised safety inspection standards. The establishment procedure of safety inspection system developed in our previous study can play a crucial role in reducing accidents resulting in fatalities and injuries at construction sites, ultimately contributing to a safer working environment for all involved parties.

PURPOSES : A North Korean private-financed highway is constructed in this study using an appropriate financing introduction method. METHODS : Based on the North Korea traffic demand prediction model, we assume that private finance investors construct three lines in North Korea. In addition, private finance can recover invested money with real toll income via the South Korean toll system in 30 years. RESULTS : The results indicate that private finance parties can recover invested money in two lines in North Korea within 30 years, whereas the remaining line cannot. A collection period is 30 years, the future traffic volume, utilization rate by vehicle type, and toll rate based on the Korea Highway Corporation system are assumed. CONCLUSIONS : The public private partnership market undergoes many types of changes. In the early stages of private investment projects in England, the toll model is implemented, followed by the shadow toll model. Subsequently, the availability payment model is implemented. To promote private finance funding for the North Korean expressway, the South Korea government should subsidize money for uncollectable lines. Using these models, the availability payment and hybrid annuity model will reduce the risks of private parties in North Korea private financed highways.

PURPOSES : The Ministry of Land, Infrastructure and Transport (MOLIT) and its subordinate agencies have recently established various policies for the application of BIM and are implementing these policies, and are increasing project orders with the application of BIM. Developed countries where they have earlier adopted BIM provide BIM standards and guidelines at the national level to support BIM implementation by private-sector constructors. Domestic BIM standards and guidelines, however, have been lacking details on upper-level standards that have to be presented by ordering agencies, thereby limiting the practical application thereof. This study aims to provide BIM practice manual development measures to ensure the facilitation of the writing of BIM outputs and their delivery in the road sector. METHODS: This study first analyzed domestic BIM standards and guidelines, and examined BIM processes in the existing BIM guidelines to determine the major works required in each stage of the implementation of road construction projects. Further, the study determined those matters that were required in working BIM but were not specified in existing BIM guidelines. Those derived contents have been reflected in the definition of the configuration system in the table of contents of the BIM practice manual, and in the contents on the road sector, and the details of each configuration system have been specified. RESULTS : The proposed BIM practice manual for the road sector is a technical guide on BIM guidelines published by public ordering agencies, and provides the basic requirements and methods required for the writing of BIM models. Further, the manual provides working procedures and detailed methods for writing BIM to enable working-level staffers on BIM projects to construct BIM data. The proposed BIM practice manual was configured with considerations for domestic civil-sector BIM technology levels and will be further developed and improved according to the development of domestic BIM technology. CONCLUSIONS : In an effort to respond to the changing domestic construction technology environment, and to apply and activate BIM, this study analyzed domestic BIM standards and guidelines, and defined a working BIM manual configuration system and its detailed configuration method. The findings and improvements are presented as a BIM practice manual on development measures in the road sector. This manual is expected to minimize the repetitive trials and errors and design errors in the construction of road-sector BIM models, to improve the productivity and efficiency in the creation of BIM outputs and their delivery, and to enhance the quality and utilization of the outputs. Further, the proposed manual is expected to provide and share information on the practical cases for BIM, to bolster the capabilities of design engineering, to ensure the linkage with relevant agencies, and thus to expand the diffusion of BIM in a virtuous cycle.

PURPOSES : With the recent change to domestic and overseas construction technologies, which led to the adoption and application of threedimensional building information management (BIM), a BIM output delivery operation system is needed for the civil engineering infrastructure category. This study analyzes the domestic and overseas BIM-order placement, BIM-related guidelines/guides, and the BIM output delivery system for the road construction project category to present guideline development measures for BIM output writing and delivery. METHODS: This study surveys and analyzes the domestic BIM-related research trends to examine the domestic-infrastructure BIM-order placement situations in public ordering agencies. Additionally, it analyzes the domestic BIM-related guides and guidelines and existing twodimensional electronic delivery systems and the domestic and overseas BIM output delivery systems. This study defines the guideline composition system and direction to present criteria for BIM output writing, delivery, management, and utilization in the road category. Furthermore, it presents guideline composition measures for BIM output writing and delivery to propose detailed criteria, output-list composition, and output inspection procedures. RESULTS : This study presented BIM output guideline development measures for planning BIM output writing and delivery and management/utilization measures in the road category. To that end, it determined the domestic and overseas BIM guide and guideline composition systems, BIM ordering criteria, BIM data writing and delivery criteria, BIM output management and utilization measures, and a common BIM output list to present suitable detailed criteria. CONCLUSIONS: This study sought to respond to changes to the domestic and overseas construction environment and to present output writing/delivery guidelines as activation measures supporting the adoption and application of BIM. To that end, we analyzed the domestic and overseas BIM guidelines and guides, task instructions, bid information, etc. to define the appropriate composition system and to give it direction. We defined the contents of tables and detailed descriptions to present guideline development measures for BIM output writing/delivery guidelines in the road category. This is expected to improve work efficiency for BIM and to enhance output quality and utilization. Furthermore, the adoption of BIM in the road category will provide an infrastructure environment with which to exchange BIM information with related agencies. We plant to further develop verification tools for the Ministry of Land, Infrastructure, and Transport's BIM model projects, for their output writing and delivery, and for an integrated BIM platform that will continue to improve the proposed criteria.

PURPOSES : The purpose of this study was to investigate the behaviors of the middle slab in a double-deck road tunnel subjected to construction equipment loading from such as a concrete pump car, concrete transmixer, and lifting crane. METHODS: The major construction processes of a middle slab include concrete placement, concrete transportation, and lifting of materials near the emergency passageway section. During the concrete placement, the middle slab is subjected to construction loading due to the presence of the concrete pump car and fully loaded concrete transmixer. During the concrete transportation, the middle slab is subjected to loadings from both the fully loaded and empty concrete transmixer. The emergency passageway section of the middle slab is subjected to crane loading during lifting work. The magnitudes and geometries of these construction loadings are determined and the stresses and deflections of the middle slab under these loadings are analyzed using finite element models of the middle slab. The behaviors of the middle slab under the design truck loadings are also analyzed to compare the results with those under construction loadings. RESULTS : The stresses and deflections of the middle slab under construction loadings are comparable to those under the design truck loadings. Higher stresses can be observed when the concrete transmixers cross paths at the expansion joint section of the middle slab. The behaviors of the middle slab under the construction loadings during concrete placement are very similar regardless of the section types of the middle slab such as the normal, expansion joint, and emergency passageway sections. CONCLUSIONS : When the middle slab is designed, the construction loadings should be considered to determine the primary design loads and to verify the usability of a variety of construction equipment.

PURPOSES : This study aims to survey and analyze the status of the design and completion documents output delivery system in public construction projects in order to assess the problems of the Ministry of Land, Infrastructure and Transport (MOLIT)'s electronic delivery system, with a focus on roads and rivers, and to offer improvement measures. METHODS: This study first surveys and analyzes laws and existing study trends with regard to the design and completion documents output delivery system in public construction projects. It further analyzes the status of the output delivery system in public construction projects, including roads, rivers, expressways, water resources, and railroads. In addition, a comparative analysis of the current electronic delivery system of MOLIT and Korea Expressway Corporation in the road field is conducted, and the problems and improvement measures for MOLIT's electronic output delivery system are presented. This study seeks to analyze problems and prepare improvement measures with regard to road and river public construction projects, as ordered by MOLIT’s five regional offices. RESULTS: This study sought to prepare the electronic output delivery system with regard to public construction projects and present the analysis of its major problems and improvement measures in four categories: “the preparation of electronic design documents output delivery system improvement measures including inspection and delivery,”“preparation of guidelines, systems, etc., concerning electronic design documents,”“preparation of improvement measures for the construction project management system and electronic design document support tools”, and “linking of MOLIT's electronic output delivery system with relevant agencies and the expansion thereof to local governments.” CONCLUSIONS : This study analyzed the current status and problems of the MOLIT's electronic output delivery system in the field of road and river construction projects, and presented corresponding improvement measures. This study is expected to address the problems of the MOLIT's electronic output delivery system, and to provide the foundation for the preparation of an efficient electronic output delivery system for design and completion documents. In addition, this study is expected to boost the quality and utilization of the electronic design documents output, and to exchange, share, and link construction information among relevant agencies so as to prepare the foundation for sharing construction information.