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4 results on '"Li, Zhangmiao"'

3. Identification of unbalanced bids based on grey-fuzzy evaluation method

Author

Su, Limin, Li, Huimin, Li, Zhangmiao, and Cao, Yongchao

Subjects
Engineering and manufacturing industries
Abstract

To provide theoretical reference for owners to identify unbalanced bids, this paper aims to construct an identification method based on grey relational and fuzzy set theory. Firstly, to measure the closeness degree between bidding unit price from engineering's estimated price, grey relational analysis theory is used to express the relationship between them. Secondly, a combined weight method determining all line items is calculated through integrating analytic hierarchy model and maximizing deviation method. Thirdly, based on fuzzy set theory, the membership degree and the fuzzy relation matrix are constructed, and then a fuzzy comprehensive identification method is established to identify unbalanced bidding. Fourthly, on the basis of fuzzy comprehensive identification method, the scoring set and total score vector are designed, and the rank of unbalanced bids is obtained by total score vector. Finally, a practical construction project bidding is stated to illustrate the effectiveness and practicability of the proposed method. Key words: project management, unbalanced bid, identification, grey-fuzzy evaluation method. Afin de fournir une reference theorique aux proprietaries pour determiner les soumissions inegales, le present document vise a construire une methode d'identification basee sur la theorie grise rationnelle et la theorie des ensembles flous. Premierement, dans le but de mesurer le degre de proximite entre le prix unitaire de la soumission et le prix estimatif de l'ingenierie, on utilise la theorie grise de l'analyse rationnelle pour exprimer la relation entre les deux. Deuxiemement, une methode de ponderation combinee pour determiner tous les postes est calculee en integrant un modele de hierarchie analytique et la methode d'ecart superieur. Troisiemement, sur la base de la theorie des ensembles flous, le degre d'appartenance et la matrice des relations floues sont construits, puis une methode d'identification globale floue est etablie pour determiner les soumissions inegales. Quatriemement, sur la base de la methode d'identification complete floue, l'ensemble des cotes et le vecteur des cotes globales sont concus, et le rang des soumissions inegales est obtenu par le vecteur des cotes globales. Enfin, une soumission pratique pour un projet de construction est presentee pour illustrer l'efficacite et la faisabilite de la methode proposee. Mots-cles: gestion de projet, soumission inegale, identification, methode devaluation grise-floue., Introduction Competitive bidding is one of the most common approaches for owners to select contractors in the construction industry (Takano et al. 2018). In the unit price contract, the measurement [...]

Published
2020
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4. Unfolding the synergy and interaction of water-land-food nexus for sustainable resource management: A supernetwork analysis

Author

Xiao Changlin, Zheng Yuxi, Hong Jingke, and Li Zhangmiao

Subjects
Environmental Engineering, Resource (biology), 010504 meteorology & atmospheric sciences, Land use, Socioeconomic development, 010501 environmental sciences, Environmental economics, 01 natural sciences, Pollution, Goods and services, Agricultural land, Environmental Chemistry, Resource allocation, Resource management, Business, Waste Management and Disposal, Nexus (standard), 0105 earth and related environmental sciences
Abstract

Given the large amounts of water, land, and food embodied in the trade of goods and services, a key step in decoupling extensive resource consumption from the economic system is to understand the full impact of socioeconomic development on the water-land-food nexus. This study integrates input–output analysis, ecological network analysis, and Dempster–Shafer evidence theory into a supernetwork model to detect the water-land-food nexus among economic sectors with an aim to explore effective strategic paths for resource management and to facilitate the construction of a resource-saving society. Results show that most sectors of China are resource inefficient and that all resource systems are unsustainable as reflected in the low performance of their Finn's cycling index and system robustness. Meanwhile, results of flow networks analysis show an extremely uneven land resource allocation where more than 94% of the land used in China is classified as direct agricultural land. The water-land-food nexus can gain resource saving bonus via enhancing the robustness of economy. However, the co-benefits from the nexus are negligibly small for the resource utilization efficiency. The results also indicate that the relevant resource-saving policies on food and water are highly likely to gain resource co-benefits due to their similarities in sectoral importance. Correspondingly, a set of strategic measures, including adopting a tiered resource price, deepening industrial convergence of agriculture, enhancing agriculture-food nexus, and managing water or land use from the food consumer side, are designed to build a resource-saving society. The findings of this study can provide additional insights into the impacts of the economy on the water-land-food nexus, which is beneficial for achieving an efficient and coordinated management of resources.

Published
2020

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