Browsing by Author "Liu, Jang-Jeng"

Now showing 1 - 3 of 3

APPLICATION OF IMPORTANCE-SATISFACTION ANALYSIS AND INFLUENCE-RELATIONS MAP TO EVALUATE DESIGN DELAY FACTORS
(2014-08-01)
Wang, Wei-Chih
;
Lin, Chia-Li
;
Wang, Shih-Hsu
;
Liu, Jang-Jeng
;
Lee, Ming-Tsung
Design delays can negatively influence the total completion time of a facility construction project. Knowing the factors to which design delays are most sensitive supports the time management of designs. However, factors that cause design delays are several and interrelated. This study proposes a new model to identify key factors that drive design delays. The core of the model integrates importance-satisfaction analysis (ISA) and an influence-relations map (IRM). The ISA evaluates the performance of each delay factor, while the IRM captures the causal relationships among factors. Additionally, the IRM is generated using a decision making trial and evaluation laboratory technique (DEMATEL). The model is applied to a real-world high-tech facility construction project to indicate the strengths of the model. In this investigation, four first-level delay factors and 17 second-level delay sub-factors are derived. The factor of "organization\'s decision making and budget constraints" is identified as the key driver of design delays in the project of interest. The results support management in determining which problem factors should be given priority attention. The proposed model can be employed in other decision-making situations that involve interrelated factors.
Model for evaluating uncertain project duration considering construction interface problems
(2014)
Wang, Shih-Hsu
;
Lai, Yu-Ting
;
Liu, Jang-Jeng
;
Wang, Wei-Chih
;
土木工程學系
Many probabilistic scheduling models have been developed to determine the duration of construction projects. However, these models are not appropriate to capture the effect of the factors that are involved construction interface problems on the durations of multiple activities. This work presents a simulation-based probabilistic scheduling model that includes the impact of construction interface problems on the duration of building projects. The proposed model is established according to an activity duration model and a work-group (WG)-based schedule network. The activity duration model is applied to reflect the effects of "general factors" on the duration of each activity; the WG-based schedule network is employed to evaluate the effects of construction interface problems on the durations of multiple activities. The results of applying the proposed model to an example project reveal that the duration of a project can be over-optimistically estimated if the effects of construction interface problems are neglected.
Modeling of design iterations through simulation
(2006-09-01)
Wang, Wei-Chih
;
Liu, Jang-Jeng
;
Liao, Tzong-Shiun
;
土木工程學系
;
Department of Civil Engineering
Enhancing the scheduling of a design project can markedly reduce its total duration. However, accurately representing the schedule of a design project is complex, largely owing to that design activities generally depend on information about each other. That is, the design process involves many iterations across activities. Iterative dependency makes difficult defining the logical relationships among activities in the network and evaluating the duration of the project. This work applies a dependency structure matrix to identify design dependencies. Causes and various types of design iterations for a building project are presented. Additionally, an innovative simulation-based model is developed to incorporate the design iterations, deliverables and participants for generating a schedule of a design project. The proposed model can not only assess how design iterations affect the duration, but also evaluate the idle durations of the design participants to support the assignment of design tasks. Effectiveness of the model is demonstrated through its application to an example project. (c) 2005 Elsevier B.V. All rights reserved.