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  1. Article ; Online: Enhancing shipyard transportation efficiency through dynamic scheduling using digital twin technology.

    Sun, Miaomiao / Liang, Chengji / Chang, Daofang

    PloS one

    2024  Volume 19, Issue 2, Page(s) e0297069

    Abstract: Uncertainties, such as road restrictions at shipyards and the irregular shape of blocks, pose challenges for transporter scheduling. Efficient scheduling of multiple transporters is critical to improving transportation efficiency. The digital twin (DT) ... ...

    Abstract Uncertainties, such as road restrictions at shipyards and the irregular shape of blocks, pose challenges for transporter scheduling. Efficient scheduling of multiple transporters is critical to improving transportation efficiency. The digital twin (DT) technology offers numerous benefits, enabling interactions between the virtual and real worlds, real-time mapping, and dynamic performance evaluation. Based on DT technology, this study proposes a dynamic scheduling approach for cooperative transportation utilizing multiple transporters. The scheduling problem for multiple transporters is addressed and modeled in this study, considering factors such as block size and transporter loading. To solve this problem, a framework of DT-based multiple transporters system is established in a virtual environment. By inputting block information into this system, a solution is generated using transporter scheduling rules and interference detection methods. Experimental comparisons are conducted in this paper, exploring various scenarios with different number of tasks and the application of DT. The results demonstrate that the proposed approach effectively enhances transportation efficiency and improves ship construction efficiency. Hence, this study expands the application of DT technology in dynamic scheduling of transportation in shipyards and provides new ideas for shipbuilding company managers.
    MeSH term(s) Transportation ; Digital Technology ; Membrane Transport Proteins ; Uncertainty
    Chemical Substances Membrane Transport Proteins
    Language English
    Publishing date 2024-02-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0297069
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Analysis and Design of Typical Automated Container Terminals Layout Considering Carbon Emissions

    Wang, Nanxi / Chang, Daofang / Gao, Yinping / Shi, Xiaowei / Yuan, Jun

    Sustainability. 2019 May 24, v. 11, no. 10

    2019  

    Abstract: With the rapid development of world economy and trade and the continuous construction of green port, automated container terminal (ACT) has increasingly become the direction of future development. Layout design is the premise of ACT construction, which ... ...

    Abstract With the rapid development of world economy and trade and the continuous construction of green port, automated container terminal (ACT) has increasingly become the direction of future development. Layout design is the premise of ACT construction, which has an at least 50-year influence on the terminal. Therefore, this paper hopes to analyze and design the typical ACT layout to achieve sustainable development of the port. Firstly, a conceptual model is presented considering the interaction between different areas within the ACT when the width and length of the terminal are fixed. To select the optimal layout to achieve the goal of the green terminal, a novel mathematical model is established based on the energy consumption during cycle operation of various devices which can estimate the total carbon emission of an ACT over a period and is suitable for designing period. Then, with the developed model, an ACT in East China was taken as a case study. Finally, according to various analysis of the data results, the layout suggestion considering the sustainable development of the port is given.
    Keywords automation ; carbon ; case studies ; emissions ; energy ; mathematical models ; sustainable development ; trade ; China
    Language English
    Dates of publication 2019-0524
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2518383-7
    ISSN 2071-1050
    ISSN 2071-1050
    DOI 10.3390/su11102957
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: A hybrid parallel genetic algorithm for yard crane scheduling

    Chang, Daofang / He, Junliang / Mi, Weijian / Yan, Wei

    Transportation research Vol. 46, No. 1 , p. 136-155

    2010  Volume 46, Issue 1, Page(s) 136–155

    Author's details Junliang He; Daofang Chang; Weijian Mi; Wei Yan
    Language English
    Size graph. Darst., Ill.
    Publisher Elsevier
    Publishing place Amsterdam
    Document type Article
    ZDB-ID 1380969-6 ; 2013782-5
    ISSN 1366-5545
    ISSN 1366-5545
    Database ECONomics Information System

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  4. Article ; Online: Upper limb kinematical analysis of an elite weight lifter in the squat snatch.

    Tang, Gang / Qian, Liwei / Wang, Dongmei / Wei, Gaofeng / Chang, Daofang / Wang, Chengtao / Mi, Weijian

    Computer methods in biomechanics and biomedical engineering

    2014  Volume 17, Issue 4, Page(s) 388–394

    Abstract: The kinematical parameters such as translational acceleration and angular acceleration in the upper limb of a weightlifter may change regularly during different phases of squat snatch. This study aims to make this question clear. At first, the joint ... ...

    Abstract The kinematical parameters such as translational acceleration and angular acceleration in the upper limb of a weightlifter may change regularly during different phases of squat snatch. This study aims to make this question clear. At first, the joint coordinate system (JCS) of human upper limb based on the anatomical landmarks is defined. Then a novel method for calculating the kinematical parameters was brought forward, which was based on analyzing the relative position of the JCS to world coordinate system during an instantaneous situation and the relationship among each JCS at different times during squat snatch. Motion capture system is used to gather the data of the upper limb in an elite weightlifter during squat snatch (the mass of the barbell is 20 kg) and the method mentioned before is applied to analyze the data. Finally, the law of the change of kinematical parameters in each phase of squat snatch is found.
    MeSH term(s) Acceleration ; Biomechanical Phenomena ; Humans ; Joints/physiology ; Upper Extremity/anatomy & histology ; Upper Extremity/physiology ; Weight Lifting/physiology
    Language English
    Publishing date 2014
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2071764-7
    ISSN 1476-8259 ; 1025-5842
    ISSN (online) 1476-8259
    ISSN 1025-5842
    DOI 10.1080/10255842.2012.688104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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