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Specially, the nonlinearity satisfies the incremental quadratic constraints ([Formula: see text]) which can represent many types of common nonlinearities. The problems are discussed under the assumption that both the feedback and forward channels may suffer from denial-of-service (DoS) attacks. The attack model is constructed in the form of time-delayed switching system with four subsystems corresponding to different attack situations. Then by using the attack model, an observer-based controller is constructed in the cyber layer to stabilize the CPS encountering DoS attacks. The closed-loop stability is analyzed based on H<jats:sub>\u221e<\/jats:sub> index of switching systems in view of average dwell time (ADT) concept. Besides, the gain matrices of the controller and the observer are obtained by solving a series of matrix inequalities using an algorithm designed in this paper. Finally, the performance of security control scheme is presented by a simulation example. <\/jats:p>","DOI":"10.1177\/01423312221105141","type":"journal-article","created":{"date-parts":[[2022,8,4]],"date-time":"2022-08-04T12:56:28Z","timestamp":1659617788000},"page":"157-167","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Security switching control of cyber-physical system with incremental quadratic constraints under denial-of-service attack"],"prefix":"10.1177","volume":"45","author":[{"given":"Younan","family":"Zhao","sequence":"first","affiliation":[{"name":"The College of Electronics and Information Engineering, Tongji University, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2689-8416","authenticated-orcid":false,"given":"Fanglai","family":"Zhu","sequence":"additional","affiliation":[{"name":"The College of Electronics and Information Engineering, Tongji University, 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