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Aiyin Jiang, Bin Cheng, Ian Flood and Raymond Issa

Modified Linear Scheduling Method In Scheduling Multiple Utility Line Construction Project

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Series: w78:2006 (browse)
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E-X Sung, M-H Tsai, S-C Kang

Rainfall Thresholds and Flood Warnings: A Case Study in New Taipei City

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Series: w78:2014 (browse)
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Flood I,Nowrouzian V

Construction process modelling: a constrained graphics approach versus conventional construction simulation

Abstract: Effective construction project planning and control requires the development of a model of the projectís construction processes. The Critical Path Method (CPM) is the most popular project modelling method in construction since it is relatively simple to use and reasonably versatile in terms of the range of processes it can represent. Several other modelling techniques have been developed over the years, each with their own advantages and disadvantages. Linear scheduling, for example, has been designed to provide highly insightful visual representations of a construction process, but unfortunately is largely incapable of representing non-repetitive construction work. Discrete-event simulation is generally agreed to be the most versatile of all modelling methods, but it lacks the simplicity in use of CPM and so has not been widely adopted in construction. A new graphical constraint-based method of modelling construction processes, Foresight, has been developed with the goal of offering the simplicity in use of CPM, the visual insight of linear scheduling, and the versatility of simulation. Earlier work has demonstrated the modelling versatility of Foresight. As part of a continuing study, this paper focuses on a comparison of the Foresight approach with discrete-event construction simulation methods, specifically Stroboscope (a derivative of CYCLONE). Foresight is shown to outperform Stroboscope in terms of the simplicity of the resultant models for a series of case studies involving a number of variants of an earthmoving operation and of a sewer tunnelling operation. A qualitative comparison of the two approaches also highlights the superior visual insight provided by Foresight over conventional simulation, an attribute essential to both the effective verification and optimization of a model.

Keywords: Construction process,Foresight,process modeling,construction simulation,Stroboscope,model complexity,visual insight

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Series: convr:2013 (browse)
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Flood, I. and Pilcher, R.

Increasing the Efficiency of Construction Simulation Modelling by Using Parallel Processing

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Series: w78:1986 (browse)
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Flood, Ian; Issa, Raja R.A.; Mutis, Ivan

A Virtual Reality Interpreter for Aiding the Reconciliation of Construction Concepts

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Full text: content.pdf (1,125,325 bytes) (available to registered users only)

Series: convr:2006 (browse)
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Flood, Ian; Issa, Raja R.A.; Shedid, Caesar A.

Increasing Processing Speed for Interactive Real-Time Simulation Environments

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I Flood, V Nowrouzian

Foresight: Graphical Constraint-Based Modeling Versus Simulation

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Full text: content.pdf (166,713 bytes) (available to registered users only)

Series: w78:2012 (browse)
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Ian Flood, Raja R.A. Issa, and Wen Liu

A New Modeling Paradigm For Computer-Based Construction Project Planning

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Ian Flood, Raymond Issa, Wen Liu

New approaches for computer-based construction project planning

Abstract: The paper reviews the principles of existing computer-based planning tools, and proposes a syntheses of many of these ideas, along with some enhancements. The overall aim is to provide a single tool that embraces the ad-vantages of each of the current planning methodologies, and that is better suited to the demands of present-day con-struction project management. The specific objectives of the tool are simplicity in use, versatility in application, provi-sion of user insight into the functioning of a project, and effective optimization of the project objectives. At the func-tional level, the developments are concerned with: (i) the way in which a model is structured (simplifying model design and understanding); (ii) redefining the way in which tasks interact and depend on each other (so that the approach is no longer limited to a schedule-centric perspective with interactions occurring at discrete points in time); (iii) provid-ing a more realistic representation of resources and their dependencies to reflect the way work may actually be carried out on site (such as the use of flexible and divisible crews); (iv) the visualization (graphic representation) of both the model structure and work progress within an integrated format that also facilitates model development and editing; and (v) optimization of the overall project objectives. The principles of the existing and proposed new approach to project planning are discussed and rationalized, and application of the new approach is demonstrated and compared to exist-ing planning methodologies for some example construction processes.

Keywords: project planning; project optimization; critical path method; hybrid continuous-discrete simulation; lin-ear projects

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Full text: content.pdf (329,051 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Ivan Mutis, Raja R.A. Issa and Ian Flood

Semantic Structures For Construction Concept Interpretations

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Full text: content.pdf (620,362 bytes) (available to registered users only)

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