The k-Allocation Problem and Its Variants

Author(s):  
Dorit S. Hochbaum ◽  
Asaf Levin
Keyword(s):  
2019 ◽  
Vol 30 (6) ◽  
pp. 1252-1259
Author(s):  
Meilin WEN ◽  
Bohan LU ◽  
Shuyu LI ◽  
Rui KANG

2021 ◽  
Vol 9 (2) ◽  
pp. 152
Author(s):  
Edwar Lujan ◽  
Edmundo Vergara ◽  
Jose Rodriguez-Melquiades ◽  
Miguel Jiménez-Carrión ◽  
Carlos Sabino-Escobar ◽  
...  

This work introduces a fuzzy optimization model, which solves in an integrated way the berth allocation problem (BAP) and the quay crane allocation problem (QCAP). The problem is solved for multiple quays, considering vessels’ imprecise arrival times. The model optimizes the use of the quays. The BAP + QCAP, is a NP-hard (Non-deterministic polynomial-time hardness) combinatorial optimization problem, where the decision to assign available quays for each vessel adds more complexity. The imprecise vessel arrival times and the decision variables—berth and departure times—are represented by triangular fuzzy numbers. The model obtains a robust berthing plan that supports early and late arrivals and also assigns cranes to each berth vessel. The model was implemented in the CPLEX solver (IBM ILOG CPLEX Optimization Studio); obtaining in a short time an optimal solution for very small instances. For medium instances, an undefined behavior was found, where a solution (optimal or not) may be found. For large instances, no solutions were found during the assigned processing time (60 min). Although the model was applied for n = 2 quays, it can be adapted to “n” quays. For medium and large instances, the model must be solved with metaheuristics.


2021 ◽  
pp. 107168
Author(s):  
Emmanouil Thanos ◽  
Tulio Toffolo ◽  
Haroldo Gambini Santos ◽  
Wim Vancroonenburg ◽  
Greet Vanden Berghe

2021 ◽  
Vol 212 ◽  
pp. 107620
Author(s):  
Umar Muhammad Modibbo ◽  
Mohd. Arshad ◽  
Omer Abdalghani ◽  
Irfan Ali

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