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基于遗传算法的城市交通运输网优化问题研究 被引量:9
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作者 孙艳丰 william h.k.lam 《系统工程理论与实践》 EI CSCD 北大核心 2000年第7期94-98,共5页
香港是一个市区人口相对集中的城市 ,公路和公共交通运输网的优化非常重要 ,随着经济的发展 ,人口的增加 ,对公共交通设施的需求越来越大 ,每年香港政府都要投资三亿港币建设新的公共交通设施 ,满足日益增长的需求 .这些新的交通设施要... 香港是一个市区人口相对集中的城市 ,公路和公共交通运输网的优化非常重要 ,随着经济的发展 ,人口的增加 ,对公共交通设施的需求越来越大 ,每年香港政府都要投资三亿港币建设新的公共交通设施 ,满足日益增长的需求 .这些新的交通设施要从许多公路和公共交通的规划项目中选择 ,这个问题数学上归结为一个 0 -1规划问题 .本文用遗传算法对这一 0 -1规划问题进行了求解 ,这是第一次将遗传算法应用于实际的网络设计问题 ,这一模型将有助于香港政府进行交通规划 ,香港 2 0 0 展开更多
关键词 城市交通运输网 优化问题 遗传算法 0-1规划
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A Bayesian modeling approach to bi-directional pedestrian flows in carnival events
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作者 S.Q.XIE S.C.WONG william h.k.lam 《Frontiers of Engineering Management》 2017年第4期483-489,共7页
Bi-directional pedestrian flows are common at crosswalks, footpaths, and shopping areas. However, the properties of pedestrian movement may vary in urban areas according to the type of walking facility. In recent year... Bi-directional pedestrian flows are common at crosswalks, footpaths, and shopping areas. However, the properties of pedestrian movement may vary in urban areas according to the type of walking facility. In recent years,crowd movements at carnival events have attracted the attention of researchers. In contrast to pedestrian behavior in other walking facilities, pedestrians whose attention is attracted by carnival displays or activities may slow down and even stop walking. The Lunar New Year Market is a traditional carnival event in Hong Kong held annually one week before the Lunar New Year. During the said event,crowd movements can be easily identified, particularly in Victoria Park, where the largest Lunar New Year Market in Hong Kong is hosted. In this study, we conducted a videobased observational survey to collect pedestrian flow and speed data at the Victoria Park Lunar New Year Market on the eve of the Lunar New Year. Using the collected data, an extant mathematical model was calibrated to capture the relationships between the relevant macroscopic quantities,thereby providing insight into pedestrian behavior at the carnival event. Bayesian inference was employed to calibrate the model by using prior data obtained from a previous controlled experiment. Results obtained enhance our understanding of crowd behavior under different conditions at carnival events, thus facilitating the improvement of the safety and efficiency of similar events in the future. 展开更多
关键词 pedestrian flow model bi-directional interactions empirical studies Bayesian inference
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