Hyeon-Seung Kim

BIM-Based Construction Scheduling Method Using Optimization Theory for Reducing Activity Overlaps

AbstractAs building information modeling (BIM) systems continue to be widely adopted, there is an increasing demand for an active construction schedule management system with more advanced decision-making capabilities. For example, if overlapping between construction activities is significant, the performance of construction operations for the corresponding activities may deteriorate. Thus, a viable construction schedule should be formulated in order to minimize overlapping of proximate construction activities. An active system can be regarded as a certain solution for this issue. The purpose of this study is to develop a systematic methodology and computer system for an optimal construction schedule simulation that minimize overlapping activities for the enhancement of a project’s operational performance. This study centers on identifying overlapping activities, applying fuzzy theory, and analyzing risk levels for schedule overlap issues. In addition, genetic algorithm (GA) theory is adopted for the mini...

Development of 5D CAD System for Visualizing Risk Degree and Progress Schedule for Construction Project

D CAD system visualizes the schedule data for construction project. Generally, 5D CAD system visualizes construction cost or resource data by linking 4D object. This study attempts to develop a 5D CAD system by linking 4D object for progress schedule data with the risk data for visualizing construction risk degree of each activity. This system uses the fuzzy analysis and AHP analysis procedures to estimate risk degree of each activity. And the system considers construction cost, duration and dangerous condition of work site as risk factors. The estimated risk degree of each activity is simulated with different colors by the risk level in 4D CAD engine that developed in this study. Because the 5D CAD system integrated with risk analysis data has creative functions comparing with the current similar systems, it can be a useful tool for visualizing practical risk data and progress schedule data.

Usability Improvement of BIM for Construction Projects Using Active BIM Functions

Most current BIM systems are focused on the visual information of work status in the design and construction stages. In a passive BIM system, 3D CAD tool can visualize the interference elements of design drawings, however, it cannot suggest a solution to solve the interference status. And 4D CAD tool in the construction stage can simulate the appearance of each activity by construction schedule, however, it cannot suggest an optimized schedule plan considering specified schedule condition of the project. Recently, many organizations need BIM solutions that can improve the work status beyond the level of simple visual information from BIM system. Active BIM system can provide the solutions to the project manager. This study suggests active BIM functions for the solutions and attempts to develop a 4D CAD engine to validate the usability of the functions.

Development of BIM Functions and System for Construction Project Through Project Life Cycle-Focusing on Bridge Construction Project-)

Recently, BIM (Building Information Modeling) technique is being considered as a critical delivery condition for the public projects according to the increase of best practices by practical application of BIM. However, since existing BIM studies are focused on the design and construction phases, those results are not considering the life cycle of a construction project. Therefore, this study suggests an integrated BIM operation process that enables an application of BIM for each phase of a construction project from planning to maintenance phases and develops an integrated BIM system based on the suggested methodologies. This study developed basic BIM functions and its application process by analyzing information systems in each project phase for a bridge construction project. Besides, this study performed case study and survey analysis for construction managers to verify a practical applicability of the developed system. Therefore, it is expected that the integrated BIM system is going to be utilized as a 3D-based integrated information management system considering life cycle of construction projects.

Development Strategies and Feasibility Evaluation of Maintenance Operation System for Railway Bridge Based on Ubiquitous-BIM Technology

Due to the issues such as omission of data, document based management, maintenance based on measurement data and wire-based network, it is difficult existing maintenance system for railway bridges to act to diverse characteristics of site and environmental changes in real time. With these reasons, there are many constraints in establishing active maintenance strategies for railway bridges. To solve these issues, this study suggests an integrated maintenance business model based on practical utilization and information management based on BIM technology to build a smart maintenance operation system based on ubiquitous computing for railway bridges. To secure its development and practical applications, a quantitative evaluation by questionnaire analysis was performed. Therefore, it is expected that the suggested model will be utilized as a framework model in order to build the smart maintenance operation system from collection of maintenance data to action for railway bridges.

Development of Estimation Model of Construction Activity Duration Using Neural Network Theory

A reasonable process for the activity duration estimation is required for the successful construction management because it directly affects the entire construction duration and budget. However, the activity duration is being generally estimated by the experience of the construction manager. This study suggests an estimation model of construction activity duration using neural network theory. This model estimates the activity duration by considering both the quantitative and qualitative elements, and the model is verified by a case study. Because the suggested model estimates the activity duration by a reasonable schedule plan, it is expected to reduce the error between planning duration and actual duration in a construction project.

Application of augmented reality object in construction project

Because a construction project is being larger in size and complicated in structure, to be a successful construction project, various information technologies should be used for the project management through life-cycle. The representative IT tools are RFID/USN (Radio Frequency IDentification/Ubiquitous Sensor Network) and BIM (Building Information Modeling) system. BIM is that the construction information through the life-cycle of a construction project, including design, construction and maintenance phases, is managed by 3D objects. AR (Augmented Reality) can be used in the construction project as one of BIM item. AR technology can be used to establish a real-life construction model by overlaying virtual object data against the actual background of a project site on a computer. This study proposes a methodology of applying the AR technology to a construction project and a prototype system to test applicability of the AR technology in rebar construction work. Application of the AR technology to construction processes may enhance workability as it displays missing design elements compared to the initial drawings.