The purpose of multi-tower crane motion planning is to find a collision-free construction process for multiple tower cranes operating in a construction site. This problem can be reduced to the path searching problem in highdimensional space and an important amount of research related to the path search algorithm has been published in various fields. In this paper, we analyzed the features of hi...

Simulation is an effective means when solving the design and operation problems in modern container terminals. Applying object-oriented discrete event system simulation method, and analyzing the technological process of loading and unloading as well as the operational management in modern container terminals, a simulation model was constructed to describe the whole operation system of container...

Non-road equipment has been an important source of pollutants that negatively affect air quality in China. An accurate emission inventory for non-road is therefore required to improve quality. The objective this paper was characterize emissions from typical diesel-fueled material handling (loaders and cranes) using a portable measurement system. Instantaneous, modal, composite were quantified s...

In recent years, the scale of container transportation and the size of vessels are becoming larger and larger; development of automatic container cranes becomes a necessity. As a key function of automatic control of unmanned cranes, the optimum route can minimize the cycle time by calculating the most efficient combination of horizontal and vertical motions of container loading/unloading. In th...

This paper presents an immersive system for virtual reality-based training of operators. Recent studies show that virtual reality simulations may be helpful in different fields, namely, industry and education. In this particular case we present a simulator for the training of tower cranes operators reducing their costs and risks. This immersive system integrates real-time 3D computer graphics w...

In this paper, a method integrating Q-learning algorithm and simulation technique is proposed to optimize the operation scheduling in container terminals. Firstly Q-learning algorithms for yard cranes and yard trailers are designed to obtain the optimal scheduling strategy of yard cranes and yard trailers. Then Q-learning is combined with simulation to develop an integrating scheduling model in...

We consider the ship planning problem at maritime container terminals where containers are loaded onto and discharged from ships using quay cranes. The container transport between the ships and the yard positions in the terminal is carried out by a fleet of straddle carriers. Based on a stowage plan provided by the shipping company, the dispatcher assigns containers to specified bay positions. ...

BEA is studying proposals to change the treatment of insurance services in the national accounts. There are 5 proposed changes: investment income will be added as a supplement to the premiums paid by policyholders; investment income is to include interest, dividends and capital gains; a measure of expected investment income will be incorporated; a measure of expected claims will be incorporated...

Various alternatives are available when designing a data collection system for portfolio investment (PI) statistics, in the context of balance of payments (BOP) and international investment position (IIP). Such systems differ according to the reporting agents they target, periodicity and level of aggregation, while the corresponding results vary in terms of implementation and running costs, ava...

A major feature of intermodal transportation systems is the presence of large container terminals, where loading and unloading of containers are split in different tasks that depend on carrier categories, cargo types and service requirements. The efficiency of a terminal is influenced by the ability to manage the various transfer tasks done by means of quay cranes, transfer cranes, trucks and s...