Results 1 to 10 of about 128 (106)

Research on tugboat scheduling optimization model considering the reliability of tugboat matching scheme [PDF]

Scientific Reports
Abstract The selection and scheduling of tugboat matching schemes are key tasks in tugboat assistance operation management. With large ships requiring more tugboat assistance, a two-stage multi-criteria decision-making method is proposed. This includes a normal distribution-based multi-attribute group decision-making method with triangular ...
Mengchi Li, Botang Li
exaly   +5 more sources

A multi-objective fuzzy programming model for port tugboat scheduling based on the Stackelberg game [PDF]

Scientific Reports
AbstractTo solve the optimization problem of tugboat scheduling for assisting ships in entering and exiting ports in uncertain environments, this study investigates the impact of the decisions of tugboat operators and port dispatchers on tugboat scheduling under the scenario of dynamic task arrival and fuzzy tugboat operation time.
Yui-Yip Lau, Maxim A Dulebenets, Botang Li   +2 more
exaly   +5 more sources

An improved gray wolf optimization to solve the multi-objective tugboat scheduling problem. [PDF]

PLoS One
With the continuous prosperity of maritime transportation on a global scale and the resulting escalation in port trade volume, tugboats assume a pivotal role as essential auxiliary tools influencing the ingress and egress of vessels into and out of ports.
Yao P, Duan X, Tang J.
europepmc   +5 more sources

An adaptive large neighborhood search algorithm for the tugboat scheduling problem

Computers and Industrial Engineering, 2023
10.1016/j.cie.2023 ...
Yijing Liang, Xiaoyang Wei
exaly   +2 more sources

Tugboat Scheduling with Multiple Berthing Bases under Uncertainty

Journal of Marine Science and Engineering, 2023
This study proposes a novel fuzzy programming optimization model for tugboat scheduling, directly considering multiple berthing bases, time windows, and operational uncertainties. The uncertainties in the required number of tugboats, the earliest start time, the latest start time, the processing time, and the start and end locations of each task are ...
Botang Li, Yui-Yip Lau, Maxim A Dulebenets   +2 more
exaly   +4 more sources

Dynamic Tugboat Scheduling for Large Seaports with Multiple Terminals

Journal of Marine Science and Engineering
Effective utilization of tugboats is the key to safe and efficient transport and service in ports. With the growth of maritime traffic, more and more large seaports show a trend toward becoming super-scale, and are divided into multiple specialized terminals. This paper focuses on the problem of large-scale tugboat scheduling.
Linying Chen, Pengfei Chen, Chen Linying   +2 more
exaly   +3 more sources

Optimal Scheduling of an Electric Propulsion Tugboat Considering Various Operating Conditions and Navigation Uncertainties

Journal of Marine Science and Engineering, 2022
The operating conditions of all-electric tugboats are flexible and changeable. They are more complicated than conventional vessels in terms of joint voyages and power generation scheduling. To guarantee the reliable operation of the ship, a new coordinated optimization scheme that combines economy and operational reliability is proposed. It is based on
Jingjie Gao, Hai Lan, Peng Cheng
exaly   +3 more sources

Simulated Annealing‐Based Ant Colony Algorithm for Tugboat Scheduling Optimization [PDF]

Mathematical Problems in Engineering, 2012
As the “first service station” for ships in the whole port logistics system, the tugboat operation system is one of the most important systems in port logistics. This paper formulated the tugboat scheduling problem as a multiprocessor task scheduling problem (MTSP) after analyzing the characteristics of tugboat operation. The model considers factors of
Xu, Qi, Mao, Jun, Jin, Zhihong
openaire   +1 more source

An Improved Discrete PSO for Tugboat Assignment Problem under a Hybrid Scheduling Rule in Container Terminal [PDF]

Mathematical Problems in Engineering, 2014
In container terminal, tugboat plays vital role in safety of ship docking. Tugboat assignment problem under a hybrid scheduling rule (TAP‐HSR) is to determine the assignment between multiple tugboats and ships and the scheduling sequence of ships to minimize the turnaround time of ships.
Wang, Su, Zhu, Min, Kaku, Ikou, Chen, Guoyue, Wang, Mingya   +4 more
openaire   +1 more source

Tugboat scheduling problem in large container ports: A case study of the Singapore port

Journal of Physics: Conference Series, 2021
Abstract In recent years, more and more container ports have become congested because of the large number of visiting ships to the ports. This causes a difficult dispatching and management problem for port operators, that is, the tugboat scheduling problem.
openaire   +1 more source