Maritime decarbonization and strict international regulations have forced liner companies to find new solutions for reducing fuel consumption greenhouse gas emissions in recent years. Green technology is regarded as one of the most promising alternatives achieve environmental benefits despite its high initial investment costs. Therefore, a scientific method required assess possibility green ado...

We present a simultaneous approach to solve the integrated vehicle and crew scheduling problem in an extra urban context. We consider the single depot case with a heterogeneous fleet of vehicles. We propose a constraint based model which is subsequently solved by a Greedy Randomized Adaptive Search Procedure. The construction phase of each initial solution relies on constraint programming techn...

Approximately 2.2 million tons of sugarcane is carted over a tons weighted average distance of 30 km in the Sezela mill area per annum. This costs more than R58 million per season. The Sezela cane transport system is comprised of approximately 120 independently managed vehicles owned by a wide range of hauliers and individual growers. This study investigated the potential savings that may occur...

Crew members on cruise ships are hired in a global labor market, and a major cost for cruise lines is moving crewmembers from their home cities to the cruise ship’s departure port. Complicating the crew scheduling problem is the uncertainty due to no-shows, terminations, and other reasons for crew to terminate their contract prematurely. To address this problem, this paper describes a schedulin...

A considerable amount of research has been concerned with the domain of automatic planning and scheduling, but many real world scheduling problems such as The Pick up and Delivery Problem With Time Windows (PDPTW) are still not easily tackled. The PDPTW problem demands solving the schedule for each vehicle of a transportation fleet where pick up and delivery of customer orders are distributed a...

In this paper both continuous and discrete models for the microCHP (Combined Heat and Power) scheduling problem are derived. This problem consists of the decision making to plan runs for a specific type of distributed electricity generators, the microCHP. As a special result, one model variant of the problem, named n-DSHSP-restricted, is proven to be NPcomplete in the strong sense. This shows t...

Scheduling problems in the forest industry have received significant attention in the recent years and have contributed many challenging applications for optimization technologies. This paper proposes a solution method based on constraint programming and mathematical programming for a log-truck scheduling problem. The problem consists of scheduling the transportation of logs between forest area...

A scheduling problem for an engineer-to-order foundry that manufactures propeller blades for ships is outlined. The main objective for the foundry is to find an efficient production plan that minimizes the total number of days orders are late. This has to be done subject to a set of relatively common constraints related to the scheduling of the present jobs and resources. The constraints on the...

Battery electric buses (BEBs) are considered effective options for sustainable mobility. Their operational efficiency is significantly influenced by the deployment of charging infrastructure and scheduling bus fleet. In this research, we develop an integrated optimization model charger fleet BEBs under opportunity charging. The jointly optimizes battery nominal capacity, size, at stops central ...