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Syst."],"published-print":{"date-parts":[[2022,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In contrast to classical data envelopment analysis (DEA), network DEA has attention to the internal structure of a production system and reveals the relationship between the efficiency of system and efficiencies of the processes. However, the flexibility of weights and the need for crisp input and output data in the evaluation process are two major shortcomings of classical network DEA models. This paper presents a common weights approach for a relational network DEA model in a fuzzy environment to measure the efficiencies of the system and the component processes. The proposed approach first finds upper bounds on input and output weights for a given cut level and then it determines a common set of weights (CSW) for all decision-making units (DMUs). Hence, the fuzzy efficiencies of all processes and systems for all DMUs are obtained based on the resulting CSW. The developed fuzzy relational network DEA and the proposed common weights approach are illustrated with a numerical example. The obtained results confirm that the fuzzy data affects over the efficiency scores and complete ranking of DMUs. The applicability of the proposed network model is illustrated by performance evaluation of gas refineries in Iran.<\/jats:p>","DOI":"10.1007\/s40747-022-00687-9","type":"journal-article","created":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T03:02:53Z","timestamp":1647226973000},"page":"4021-4049","update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Fuzzy efficiency evaluation in relational network data envelopment analysis: application in gas refineries"],"prefix":"10.1007","volume":"8","author":[{"given":"Somayeh","family":"Tabatabaei","sequence":"first","affiliation":[]},{"given":"Mohammad Reza","family":"Mozaffari","sequence":"additional","affiliation":[]},{"given":"Mohsen","family":"Rostamy-Malkhalifeh","sequence":"additional","affiliation":[]},{"given":"Farhad","family":"Hosseinzadeh Lotfi","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,3,14]]},"reference":[{"issue":"2","key":"687_CR1","doi-asserted-by":"crossref","first-page":"442","DOI":"10.1016\/j.omega.2012.02.004","volume":"41","author":"N Adler","year":"2013","unstructured":"Adler N, Liebert V, Yazhemsky E (2013) Benchmarking airports from a managerial perspective. 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