Conclusion
This paper tries to present a comprehensive literature review of recent and state-of-the-art papers in RL/CLSC regarding vast numbers of publications in different scientific journals in RL and CLSC issues. Totally, 382 published papers between January 2007 and March 2013 are selected, reviewed, categorized, and analyzed to find the future directions and opportunities of research in RL/CLSC. The gaps in literature are identified and completely discussed to clarify the future research opportunities for the authors.
Mutual interrelations and a comprehensive view in selecting different problems suggests several future directions in problem classifications and opportunities. Modification opportunities in nondeterministic approaches, utilizing two-stage stochastic and robust optimization approaches, considering forecasting methods, and regarding new uncertain parameters are identified as future opportunities in uncertain parameters. Nonlinear programming and convex optimization, and utilizing other modeling approaches are recommended as opportunities in modeling approaches. Balancing concerns between exact and heuristics solution methodologies and trying to break current hidden rules in solution tools are discussed in solution methodologies and its opportunities. The integration of different levels of decision-making and defining new decision variables are future opportunities for the decision variables category. Paying attention to multi objective problems, utilizing new approaches, and applying more green, sustainable, and environmental objectives can be the future directions in single and multiple objective problems.