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Furthermore, for the reason of practical problems, in which the period of production is a finite time and the biomass and toxin should be controlled into some range, the guaranteed cost controller is designed based on fuzzy models. While controlling the biomass concentration achieved the specified range, the controller in this paper eliminated the toxin entirely or controlled the toxin in traces concentration according the actual demand of different environment. Finally, a practical example is carried out to illustrate the feasibility of designed controller in the case of non-toxin and traces of toxin, respectively.<\/jats:p>","DOI":"10.3233\/jifs-17556","type":"journal-article","created":{"date-parts":[[2017,9,22]],"date-time":"2017-09-22T11:02:29Z","timestamp":1506078149000},"page":"2415-2426","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":7,"title":["Fuzzy optimal guaranteed cost control of a single species model with stage-structure in toxic environment"],"prefix":"10.1177","volume":"33","author":[{"given":"Shuanghong","family":"Zhang","sequence":"first","affiliation":[{"name":"Institute of System Science, Northeastern University, Shenyang, Liaoning Province, China"},{"name":"School of Mathematics, Jilin Normal University, Siping, Jilin Province, 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