Context Adaptation of Fuzzy Inference System-Based Construction Labor Productivity Models

Abraham Assefa Tsehayae,Aminah Robinson Fayek

doi:10.1155/2018/5802918

Abraham Assefa Tsehayae, Aminah Robinson Fayek

Open Access

https://doi.org/10.1155/2018/5802918

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Abstract

Construction labor productivity (CLP) is one of the most studied areas in the construction research field, and several context-specific predictive models have been developed. However, CLP model development remains a challenge, as the complex impact of multiple subjective and objective influencing variables have to be examined in various project contexts while dealing with limited data availability. On the other hand, lack of a framework for adapting existing or original models from one context to other contexts limits the possibility of reusing existing models. Such challenges are addressed in this paper through the development of a context adaptation framework. The framework is used to transfer the knowledge represented in fuzzy inference (FIS) based CLP models from one context to another, by using linear and nonlinear evolutionary based transformation of the membership functions combined with sensitivity analysis of fuzzy operators and defuzzification methods. Using four context-specific CLP models developed for concreting activity under industrial, warehouse, high-rise, and institutional building project contexts, the framework was implemented, and the prediction capability of the adapted models was evaluated based on their prediction similarity with the original models. The results showed that linearly adapted CLP models for industrial and institutional contexts and nonlinearly adapted CLP models for warehouse and high-rise contexts provide a similar prediction capability with the original models. The proposed context adaptation framework and findings from this paper address the limitations in past context adaptation research by examining a practical context-sensitive application problem and further examining the role of fuzzy operators and defuzzification methods. The findings assist researchers and industry practitioners to take full advantage of existing FIS-based models in the study of new contexts, for which data availability might be limited.

Highlights

Introduction and BackgroundConstruction labor productivity (CLP) has a direct and significant influence on success of construction projects; CLP has been well studied [1]
The main objectives of this research are to (1) develop a framework for context adaption of Fuzzy inference systems (FISs)-based CLP models, (2) test the framework using real-world problem, and (3) improve on limitations with existing context adaptation approaches which relied on normalized membership function (MF)
This paper developed a context adaptation framework for transferring the knowledge represented in FIS-based CLP models from one context to another

Summary

Introduction

Introduction and BackgroundConstruction labor productivity (CLP) has a direct and significant influence on success of construction projects; CLP has been well studied [1]. Numerous predictive CLP models have been tested and developed, even though, collecting and modeling productivity data are known to require significant financial investment [2]. CLP modeling deals with a complex problem involving a large number of subjective and objective variables and is faced with limited data availability, making CLP modeling an exceptional target for fuzzy inference systems. FISs are suitable for context adaption, whereby they can be adapted to suit other project contexts and enable users to take full advantage of existing FIS in the analysis of new contexts.

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Results

Conclusion