. 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.