Research Article
Operations Research/Management Science Research in Europe: A Bibliometric Overview
Table 10
Distribution of the most repeated keywords by year (between 1990 and 2018).
| Keywords | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | Freq. |
| Multiobjective optimization | 2 | 13 | 15 | 14 | 20 | 28 | 25 | 25 | 30 | 43 | 42 | 35 | 47 | 47 | 60 | 48 | 62 | 87 | 83 | 106 | 97 | 123 | 115 | 105 | 98 | 146 | 119 | 130 | 135 | 1900 | Heuristics | 3 | 19 | 13 | 18 | 26 | 31 | 44 | 33 | 57 | 42 | 36 | 29 | 56 | 55 | 50 | 60 | 61 | 85 | 77 | 81 | 71 | 78 | 83 | 84 | 70 | 90 | 88 | 82 | 65 | 1587 | Scheduling | 3 | 16 | 15 | 16 | 28 | 28 | 42 | 21 | 46 | 37 | 38 | 42 | 43 | 33 | 51 | 70 | 57 | 83 | 90 | 79 | 78 | 81 | 84 | 89 | 67 | 93 | 70 | 95 | 82 | 1577 | Simulation | 0 | 7 | 11 | 9 | 10 | 21 | 26 | 26 | 29 | 31 | 32 | 28 | 29 | 31 | 41 | 36 | 37 | 55 | 55 | 74 | 69 | 65 | 69 | 57 | 51 | 77 | 52 | 67 | 71 | 1166 | Optimization | 1 | 13 | 15 | 13 | 18 | 26 | 20 | 20 | 30 | 22 | 36 | 28 | 35 | 19 | 28 | 25 | 44 | 33 | 44 | 67 | 53 | 61 | 72 | 66 | 40 | 70 | 73 | 79 | 90 | 1141 | Supply chain management | 0 | 0 | 0 | 0 | 0 | 7 | 3 | 3 | 3 | 7 | 12 | 24 | 35 | 32 | 49 | 30 | 42 | 59 | 60 | 70 | 63 | 74 | 89 | 78 | 66 | 66 | 60 | 84 | 87 | 1103 | Genetic algorithms | 0 | 0 | 0 | 1 | 1 | 7 | 14 | 11 | 15 | 19 | 17 | 12 | 18 | 19 | 30 | 27 | 32 | 50 | 45 | 72 | 54 | 65 | 73 | 68 | 42 | 66 | 49 | 42 | 57 | 906 | Data envelopment analysis | 1 | 3 | 2 | 2 | 5 | 14 | 20 | 13 | 10 | 20 | 16 | 28 | 12 | 14 | 33 | 33 | 25 | 29 | 21 | 56 | 52 | 41 | 62 | 51 | 58 | 68 | 55 | 74 | 91 | 909 | Integer Programming | 2 | 6 | 16 | 6 | 8 | 15 | 9 | 10 | 29 | 14 | 15 | 22 | 25 | 15 | 30 | 15 | 39 | 38 | 36 | 44 | 44 | 50 | 56 | 32 | 47 | 55 | 69 | 51 | 79 | 877 | Decision support systems | 2 | 9 | 12 | 11 | 24 | 13 | 13 | 25 | 28 | 19 | 23 | 24 | 21 | 25 | 22 | 24 | 40 | 33 | 25 | 49 | 36 | 28 | 46 | 44 | 32 | 50 | 55 | 56 | 45 | 834 | Combinatorial optimization | 0 | 4 | 4 | 4 | 8 | 8 | 8 | 17 | 17 | 10 | 14 | 13 | 15 | 16 | 22 | 28 | 40 | 34 | 38 | 47 | 31 | 39 | 46 | 56 | 40 | 57 | 36 | 60 | 45 | 757 | Dynamic programming | 0 | 5 | 8 | 12 | 16 | 12 | 15 | 22 | 18 | 16 | 27 | 17 | 13 | 23 | 8 | 17 | 24 | 28 | 36 | 42 | 31 | 33 | 31 | 45 | 39 | 44 | 33 | 39 | 45 | 699 | Linear programming | 1 | 10 | 26 | 18 | 22 | 16 | 19 | 23 | 16 | 27 | 24 | 20 | 19 | 25 | 22 | 20 | 24 | 27 | 25 | 29 | 24 | 21 | 32 | 22 | 26 | 30 | 42 | 29 | 20 | 659 | Optimal control | 1 | 11 | 10 | 5 | 8 | 10 | 11 | 16 | 18 | 20 | 16 | 22 | 20 | 23 | 19 | 16 | 25 | 23 | 18 | 26 | 35 | 25 | 41 | 34 | 33 | 29 | 41 | 46 | 50 | 652 | Branch and Bound | 1 | 6 | 7 | 7 | 8 | 14 | 19 | 13 | 29 | 21 | 22 | 17 | 11 | 17 | 20 | 19 | 19 | 29 | 44 | 28 | 24 | 25 | 27 | 36 | 29 | 20 | 30 | 33 | 30 | 605 | Inventory | 0 | 3 | 7 | 4 | 4 | 7 | 18 | 13 | 14 | 24 | 16 | 18 | 8 | 16 | 14 | 26 | 33 | 32 | 26 | 28 | 19 | 27 | 28 | 45 | 34 | 30 | 29 | 40 | 35 | 598 | Global optimization | 0 | 6 | 3 | 15 | 18 | 9 | 11 | 18 | 14 | 16 | 20 | 17 | 15 | 14 | 18 | 21 | 19 | 24 | 26 | 40 | 34 | 19 | 28 | 35 | 23 | 25 | 33 | 36 | 34 | 591 | Tabu Search | 0 | 3 | 0 | 1 | 6 | 7 | 16 | 9 | 27 | 16 | 13 | 10 | 17 | 12 | 16 | 25 | 17 | 24 | 39 | 35 | 29 | 30 | 44 | 27 | 24 | 22 | 20 | 18 | 9 | 516 | Stochastic programming | 0 | 1 | 4 | 2 | 1 | 3 | 9 | 14 | 14 | 11 | 16 | 13 | 12 | 9 | 14 | 18 | 15 | 31 | 24 | 40 | 26 | 29 | 43 | 23 | 25 | 37 | 34 | 38 | 51 | 557 | Metaheuristics | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 5 | 3 | 5 | 8 | 7 | 18 | 18 | 26 | 30 | 25 | 41 | 29 | 31 | 49 | 44 | 27 | 41 | 32 | 59 | 24 | 525 |
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