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In this scenario, the patch-developing cost should be balanced against the negative impact of virus. This article focuses on seeking best-balanced patch-injecting strategies. First, based on a novel virus-patch interactive model, the original problem is reduced to an optimal control problem, in which (a) each admissible control stands for a feasible patch-injecting strategy and (b) the objective functional measures the balance of a feasible patch-injecting strategy. Second, the solvability of the optimal control problem is proved, and the optimality system for solving the problem is derived. Next, a few best-balanced patch-injecting strategies are presented by solving the corresponding optimality systems. Finally, the effects of some factors on the best balance of a patch-injecting strategy are examined. Our results will be helpful in defending against virus attacks in a cost-effective way.<\/jats:p>","DOI":"10.1155\/2019\/2315627","type":"journal-article","created":{"date-parts":[[2019,6,10]],"date-time":"2019-06-10T19:30:39Z","timestamp":1560195039000},"page":"1-12","source":"Crossref","is-referenced-by-count":5,"title":["Seeking Best-Balanced Patch-Injecting Strategies through Optimal Control Approach"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8998-8083","authenticated-orcid":true,"given":"Kaifan","family":"Huang","sequence":"first","affiliation":[{"name":"School of Big Data & Software Engineering, Chongqing University, Chongqing 400044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pengdeng","family":"Li","sequence":"additional","affiliation":[{"name":"School of Big Data & Software Engineering, Chongqing University, Chongqing 400044, 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