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    Q-Learning-Driven Butterfly Optimization Algorithm for Green Vehicle Routing Problem Considering Customer Preference by Weiping Meng, Yang He, Yongquan Zhou

    Published 2025-01-01
    Subjects: “…green vehicle routing problem with time windows (GVRPTW)…”
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    Contact patterns between index patients and their close contacts and assessing risk for COVID-19 transmission during different exposure time windows: a large retrospective observational study of 450 770 close contacts in Shanghai by Weibing Wang, Genming Zhao, Hao Pan, Bo Zheng, Chenyan Jiang, Yaxu Zheng, Huanyu Wu, Shenghua Mao, Ye Yao, Xiaohuan Gong, Sheng Lin, Bihong Jin, Dechuan Kong

    Published 2024-07-01
    “…The effect of different exposure time windows on the infection of close contacts was evaluated using a modified mixed-effects Poisson regression.Results Analysis of contacts indicated that 82 467 (18.29%; 95% CI 18.17%, 18.42%) were second-generation cases. …”
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