In order to solve the problems of potential incident rescue on expressway networks, the opportunity cost-based method is used to establish a resource dispatch decision model. The model aims to dispatch the rescue reso...In order to solve the problems of potential incident rescue on expressway networks, the opportunity cost-based method is used to establish a resource dispatch decision model. The model aims to dispatch the rescue resources from the regional road networks and to obtain the location of the rescue depots and the numbers of service vehicles assigned for the potential incidents. Due to the computational complexity of the decision model, a scene decomposition algorithm is proposed. The algorithm decomposes the dispatch problem from various kinds of resources to a single resource, and determines the original scene of rescue resources based on the rescue requirements and the resource matrix. Finally, a convenient optimal dispatch scheme is obtained by decomposing each original scene and simplifying the objective function. To illustrate the application of the decision model and the algorithm, a case of the expressway network is studied on areas around Nanjing city in China and the results show that the model used and the algorithm proposed are appropriate.展开更多
城市交通布局对城市形态具有重大影响,也对城市的发展方向起着重大的引导作用。以瑞典J nk ping市为例,采用CLUE-S模型模拟不同交通情景下的城市发展动态变化。首先,基于2000年土地利用数据,选择影响土地利用变化的驱动因子构建Logisti...城市交通布局对城市形态具有重大影响,也对城市的发展方向起着重大的引导作用。以瑞典J nk ping市为例,采用CLUE-S模型模拟不同交通情景下的城市发展动态变化。首先,基于2000年土地利用数据,选择影响土地利用变化的驱动因子构建Logistic回归方程。然后利用CLUE-S模型,在模型检验和参数验证的基础上,模拟未来25年不同交通情景下城市形态空间格局的变化。结果表明:可达性因子的选择对于改善用地类型的回归结果具有显著影响;不同的道路类型和交通设施等级对各用地类型转换概率有不同程度的影响。对两种不同的交通规划情景下的土地利用空间分布格局的动态模拟发现,在未来交通规划情景下,土地利用动态度增加,且在城市中心区交通发达的区域,城市呈现填空式拓展,新增加的城市用地分布比较集中;城市外围表现出较强的沿交通线的拓展趋势,城市空间结构与城市交通互动关系明显。展开更多
基金The National Natural Science Foundation of China (No.50422283)the Science and Technology Key Plan Project of Henan Province (No.072102360060)
文摘In order to solve the problems of potential incident rescue on expressway networks, the opportunity cost-based method is used to establish a resource dispatch decision model. The model aims to dispatch the rescue resources from the regional road networks and to obtain the location of the rescue depots and the numbers of service vehicles assigned for the potential incidents. Due to the computational complexity of the decision model, a scene decomposition algorithm is proposed. The algorithm decomposes the dispatch problem from various kinds of resources to a single resource, and determines the original scene of rescue resources based on the rescue requirements and the resource matrix. Finally, a convenient optimal dispatch scheme is obtained by decomposing each original scene and simplifying the objective function. To illustrate the application of the decision model and the algorithm, a case of the expressway network is studied on areas around Nanjing city in China and the results show that the model used and the algorithm proposed are appropriate.
文摘城市交通布局对城市形态具有重大影响,也对城市的发展方向起着重大的引导作用。以瑞典J nk ping市为例,采用CLUE-S模型模拟不同交通情景下的城市发展动态变化。首先,基于2000年土地利用数据,选择影响土地利用变化的驱动因子构建Logistic回归方程。然后利用CLUE-S模型,在模型检验和参数验证的基础上,模拟未来25年不同交通情景下城市形态空间格局的变化。结果表明:可达性因子的选择对于改善用地类型的回归结果具有显著影响;不同的道路类型和交通设施等级对各用地类型转换概率有不同程度的影响。对两种不同的交通规划情景下的土地利用空间分布格局的动态模拟发现,在未来交通规划情景下,土地利用动态度增加,且在城市中心区交通发达的区域,城市呈现填空式拓展,新增加的城市用地分布比较集中;城市外围表现出较强的沿交通线的拓展趋势,城市空间结构与城市交通互动关系明显。
