This paper proposes an ant colony optimization algorithm to assist railroad yard operational planning staff in their daily tasks. The proposed algorithm tries to minimize a multi-objective function that considers both fixed and variable transportation costs involved in moving railroad cars within the railroad yard area. This is accomplished by searching the best switch engine schedule for a giv...

The 0/1 knapsack equality polytope is, by deenition, the convex hull of 0/1 solutions of a single linear equation. A special form of this polytope | where the deening linear equation has nonnegative integer coeecients and the number of variables having co-eecient one exceeds the right-hand-side | is considered. Equality constraints of this form arose in a real-world application of integer progr...

The efficiency of container handling has got great improvement with the usage of the 40ft quay crane and the twin 40 ft yard crane. Reasonable bay planning strategies is necessary to reach the high handing efficiency by the twin 40 ft yard crane. This paper studies both bay planning and row planning for yard bay allocation. The models of bay planning and row planning are created, and the discre...

International sea-freight container transportation has grown dramatically over the last years and container terminals represent nowadays a key actor in the global shipping network. Terminal managers have to face with an increasing competitiveness among terminals, which require more and more efficiency in container operations both along the quayside and within the yard: the objective is usually ...

Transport vehicles in the form of trucks are one important components supporting logistics system when collecting crops a plantation company. Fresh fruit bunches (FFB) produced by oil palm plantations must be sent to location crude (CPO) processing plant at predetermined time so that quality is maintained. Therefore, scheduling and arranging route truck trips plays an role. Constraints faced ab...

Background: Scheduling the arrival of external trucks in container terminals is a critical operational decision that faces both terminal managers and trucking companies. This issue crucial for stakeholders since random causes congestion extended delays trucks. The objective scheduling truck appointments not only to control workload inside costs resulting from excessive waiting times but also, r...

the present study focuses on the formation of various types of yards in mosques and the elements that contribute to the respective process. the significance of the issue lies in that certain scholars have associated the yard in mosques with the concept of garden, and have not taken into account the elements that contribute to the development of mosque yards of various types. the theoretical fin...

This paper presents a novel matheuristic for solving the Hump Yard Block-to-Track Assignment Problem. This is an important problem rising in the railway freight industry and involves scheduling the transitions of a set of rail cars from a set of inbound trains to a set of outbound trains over a certain planning horizon. It was also the topic of the 2014 challenge organised by the Railway Applic...