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Metaheuristics have been a very active research topic for more than two decades. During this time many new metaheuristic strategies have been devised, they have been experimentally tested and improved on challenging benchmark problems, and they have proven to be important tools for tackling optimization tasks in a large number of practical applications. In other words, metaheuristics are nowadays established as one of the main search paradigms for tackling computationally hard problems. Still, there are a large number of research challenges in the area of metaheuristics. These challenges range from more fundamental questions on theoretical properties and performance guarantees, empirical algorithm analysis, the effective configuration of metaheuristic algorithms, approaches to combine metaheuristics with other algorithmic techniques, towards extending the available techniques to tackle ever more challenging problems. This edited volume grew out of the contributions presented at the ninth Metaheuristics International Conference that was held in Udine, Italy, 25-28 July 2011. The conference comprised 117 presentations of peer-reviewed contributions and 3 invited talks, and it has been attended by 169 delegates. The chapters that are collected in this book exemplify contributions to several of the research directions outlined above.

Mathematical optimization. --- Metaheuristics. --- Operations research. --- Operations research --- Mathematical optimization --- Management --- Civil & Environmental Engineering --- Engineering & Applied Sciences --- Business & Economics --- Operations Research --- Management Theory --- Optimization (Mathematics) --- Optimization techniques --- Optimization theory --- Systems optimization --- Operational analysis --- Operational research --- Business. --- Decision making. --- Management science. --- Business and Management. --- Operation Research/Decision Theory. --- Operations Research, Management Science. --- Industrial engineering --- Management science --- Research --- System theory --- Quantitative business analysis --- Problem solving --- Statistical decision --- Deciding --- Decision (Psychology) --- Decision analysis --- Decision processes --- Making decisions --- Management decisions --- Choice (Psychology) --- Trade --- Economics --- Commerce --- Industrial management --- Decision making --- Mathematical analysis --- Maxima and minima --- Simulation methods --- System analysis --- Operations Research/Decision Theory. --- Operations Research and Decision Theory. --- Operations Research, Management Science .

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This book constitutes the refereed proceedings of the 6th International Workshop on Hybrid Metaheuristics, HM 2009, held in Udine, Italy, in October 2009. The 12 revised full papers presented together with one invited talk were carefully reviewed and selected from 22 submissions. The papers discuss current issues of combinations of metaheuristics and other solving techniques of universal concern such as novel combinations of components from different metaheuristics, hybridization of metaheuristics and AI/OR techniques, low-level hybridization, high-level hybridization, portfolio techniques, expert systems, cooperative search, automated parameter tuning, empirical and statistical comparison, theoretical aspects of hybridization, parallelization, and software libraries.

Complex analysis --- Operational research. Game theory --- Computer science --- Information systems --- Computer. Automation --- IR (information retrieval) --- stochastische analyse --- complexe analyse (wiskunde) --- informatica --- database management --- informatietechnologie