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An interval-valued fuzzy linear programming with infinite α-cuts method for environmental management under uncertainty

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Abstract

In this study, an interval-valued fuzzy linear programming with infinite α-cuts (IVFLP-I) method is developed for municipal solid waste (MSW) management under uncertainty. IVFLP-I can not only tackle uncertainties expressed as intervals and interval-valued fuzzy sets, but also take all fuzzy information into account by discretizing infinite α-cut levels to the interval-valued fuzzy membership functions. Through adoption of the interval-valued fuzzy sets, IVFLP-I can directly communicate information of waste managers’ confidence levels over various subjective judgments into the optimization process. Compared to the existing methods in which only finite α-cut levels exist, IVFLP-I would have enhanced the robustness in the optimization efforts. A MSW management problem is studied to illustrate the applicability of the proposed method. Four groups of optimal solutions can be obtained through assigning different intervals of α-cut levels. The results indicate that wider intervals of α-cut levels could lead to a lower risk level of constraint violation associated with a higher system cost; contrarily, narrower intervals of α-cut levels could lead to a lower cost with a higher risk of violating the constraints. The solutions under different intervals of α-cut levels can support in-depth analyses of tradeoffs between system costs and constraint-violation risks.

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Acknowledgments

The research was supported by the Major State Basic Research Development Program of MOST (2005CB724207), and the Natural Sciences and Engineering Research Council of Canada. The authors are grateful to the editors and the anonymous reviewers for their insightful comments and suggestions.

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Correspondence to G. H. Huang.

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Wang, S., Huang, G.H., Lu, H.W. et al. An interval-valued fuzzy linear programming with infinite α-cuts method for environmental management under uncertainty. Stoch Environ Res Risk Assess 25, 211–222 (2011). https://doi.org/10.1007/s00477-010-0432-x

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