The Experts below are selected from a list of 28359 Experts worldwide ranked by ideXlab platform

Deborah F. Garrett - One of the best experts on this subject based on the ideXlab platform.

Taehoon Hong - One of the best experts on this subject based on the ideXlab platform.

  • Integrated CO2, cost, and Schedule management system for building Construction projects using the earned value management theory
    Journal of Cleaner Production, 2015
    Co-Authors: Taehoon Hong, Hyo Seon Park
    Abstract:

    Abstract Although the Construction phase in a building's life cycle is relatively very short, the density of the CO 2 emissions in the Construction phase is very higher than that in the other phases (i.e., operations and maintenance phase). However, there was little research on scheduling, monitoring, evaluating and forecasting CO 2 emissions based on the Construction Schedule. To address this challenge, this research aimed to develop an integrated CO 2 , cost and Schedule management (ICCSM) system for building Construction projects using the earned value management theory. The proposed ICCSM system consisted of five steps: (i) definition of the project scope and organization; (ii) project planning and scheduling; (iii) estimation and budgeting of the CO 2 emissions and Construction costs; (iv) establishment and weighting of the project performance measurement baseline; and (v) monitoring and forecasting of the project performance. The case study showed that the ICCSM system can evaluate and forecast the project performance earlier and more accurately, based on the Construction Schedule, (i) when integrated weighting was implemented, the project performance can be estimated faster (i.e., one day earlier); and (ii) when 0.8 × (cost performance index) + 0.2 × (Schedule performance index) was implemented as the index for calculating an estimate at completion, the project performance can be more accurately predicted (i.e., error rate = −0.24%). The ICCSM system could allow a project manager to monitor and forecast CO 2 emissions and costs based on the Construction Schedule, simultaneously.

  • simulation based Schedule estimation model for acs based core wall Construction of high rise building
    Journal of Construction Engineering and Management-asce, 2011
    Co-Authors: Taehoon Hong, Kyuman Cho, Changtaek Hyun, Seungwoo Han
    Abstract:

    Many existing studies about Construction Schedule management focus on the planning phase of a project, particularly on Schedule estimation based on the labor resources involved in the project. However, equipment resources, which are another crucial factor in the productivity of a Construction project, have not been considered in existing research. Therefore, this study aimed to develop a Schedule estimation model considering both labor and equipment resources. For the purpose of this study, core wall Construction was selected because it is a very important Construction activity in terms of Schedule estimation for high-rise building Construction. To develop a Schedule estimation model for core wall Construction, an in-depth case study was conducted. On the basis of the results of the case study, a simulation model was developed using the CYCLONE method. Finally, by using the results of the simulation, a Schedule estimation model for core wall Construction was developed by conducting multiple-regression analysis. By using the developed model, a project manager can easily, quickly, and accurately perform Schedule estimation when there are problems that may cause Construction Schedule delays during the Construction phase.

  • Model for Analysis of Factors Affecting Construction Schedule in Highway Work Zones
    Journal of Transportation Engineering-asce, 2006
    Co-Authors: Praveen Sukumaran, Mehmet Emre Bayraktar, Taehoon Hong, Makarand Hastak
    Abstract:

    In highway Construction, it is not only important to understand the factors that affect the Schedule but also to evaluate their probable severity and impact on project duration. However, there is currently no standard or accepted model existing in the industry that can be used for this purpose. This paper presents a model that identifies various factors which have a potential to influence and impact the Construction Schedule in highway work zones. Also, a stochastic analysis of those factors is conducted by the model to determine probable changes, i.e., reduction or escalation, in the original estimated Schedule for a given project. The analysis offers a revised Schedule that is bound to be more meaningful and close to the expected value. The state Department of Transportation cannot only use the results to improve project scheduling but also improve the user cost calculations and decisions regarding contract types and requirements, e.g., liquidated damages, penalties, and incentives/disincentives.

Jim Lee - One of the best experts on this subject based on the ideXlab platform.

Hongchao Chen - One of the best experts on this subject based on the ideXlab platform.

  • Construction Schedule simulation of a diversion tunnel based on the optimized ventilation time.
    Journal of hazardous materials, 2008
    Co-Authors: Xiaoling Wang, Xuepeng Liu, Yuefeng Sun, Jing Zhang, Hongchao Chen
    Abstract:

    Former studies, the methods for estimating the ventilation time are all empirical in Construction Schedule simulation. However, in many real cases of Construction Schedule, the many factors have impact on the ventilation time. Therefore, in this paper the 3D unsteady quasi-single phase models are proposed to optimize the ventilation time with different tunneling lengths. The effect of buoyancy is considered in the momentum equation of the CO transport model, while the effects of inter-phase drag, lift force, and virtual mass force are taken into account in the momentum source of the dust transport model. The prediction by the present model for airflow in a diversion tunnel is confirmed by the experimental values reported by Nakayama [Nakayama, In-situ measurement and simulation by CFD of methane gas distribution at a heading faces, Shigen-to-Sozai 114 (11) (1998) 769-775]. The Construction ventilation of the diversion tunnel of XinTangfang power station in China is used as a case. The distributions of airflow, CO and dust in the diversion tunnel are analyzed. A theory method for GIS-based dynamic visual simulation for the Construction processes of underground structure groups is presented that combines cyclic operation network simulation, system simulation, network plan optimization, and GIS-based Construction processes' 3D visualization. Based on the ventilation time the Construction Schedule of the diversion tunnel is simulated by the above theory method.

Da Wei Tong - One of the best experts on this subject based on the ideXlab platform.

  • Construction Schedule real-time control coupling Construction quality in large scale underground powerhouse
    Applied Mechanics and Materials, 2012
    Co-Authors: Da Wei Tong
    Abstract:

    Underground powerhouse of hydraulic and hydroelectric engineering is a large cavern group structure. Construction process of underground powerhouse is a complex system, whose Construction Schedule is associated with Construction quality. It is necessary to arrange Construction Schedule adopting Construction simulation method and combining with tunnel stability analysis, which can advance the level of Construction organization design. By using real-time control theory and methodology, the real-time control model of Construction Schedule and quality was established, considering Construction procedure, geological conditions and resource limitation. The real-time control method of Construction Schedule and quality was presented, and the practical control procedure was studied. Good effect is obtained through the application of the real-time control method for Construction Schedule and quality in one real underground powerhouse.