基于K-Means聚类算法的城市轨道交通站点分类及客流特征分析

文章立足于沈阳市轨道交通站点800 m范围内的人口分布、开发强度、公交接驳、路网长度分布、站点位置属性、站点客流数据等六大维度数据,采用K-Means聚类算法将城市轨道交通站点划分为居住型、商业商务型、综合开发型、产业型、交通枢纽型五大类;基于站点聚类成果,叠合多样化数据分析总结各类站点客流的普适性规律,可为后续站点周边基础设施完善、站点客流预测、车站运营组织方案做出指导。     

Integrated planning of static and dynamic charging infrastructure for electric vehicles

This paper investigates the optimal deployment of static and dynamic charging infrastructure considering the interdependency between transportation and power networks. Static infrastructure means plug-in charging stations, while the dynamic counterpart refers to electrified roads or charging lanes enabled by charging-while-driving technology. A network equilibrium model is first developed to capture the interactions among battery electric vehicles’ (BEVs) route choices, charging plans, and the prices of electricity. A mixed-integer bi-level program is then formulated to determine the deployment plan of charging infrastructure to minimize the total social cost of the coupled networks. Numerical examples are provided to demonstrate travel and charging plans of BEV drivers and the competitiveness of static and dynamic charging infrastructure. The numerical results on three networks suggest that (1) for individual BEV drivers, the choice between using charging lanes and charging stations is more sensitive to parameters including value of travel time, service fee markup, and battery size, but less sensitive to the charging rates and travel demand; (2) deploying more charging lanes is favorable for transportation networks with sparser topology while more charging stations can be more preferable for those denser networks.     

Joint deployment of charging stations and photovoltaic power plants for electric vehicles

The focus of this study is to jointly design charging stations and photovoltaic (PV) power plants with time-dependent charging fee, to improve the management of the coupled transportation and power systems. We first propose an efficient and extended label-setting algorithm to solve the EV joint routing and charging problem that considers recharging amount choices at different stations and loop movement cases. Then, a variational inequality problem is formulated to model the equilibrium of EV traffic on transportation networks, and an optimal power flow model is proposed to model the power network flow with PV power plants and optimally serve the EV charging requirements. Based on the above models for describing system states, we then formulate a model to simultaneously design charging stations, PV plants, and time-dependent charging fee. A surrogate-based optimization (SBO) algorithm is adopted to solve the model. Numerical examples demonstrate that the proposed SBO algorithm performs well. Additionally, important insights concerning the infrastructure design and price management of the coupled transportation and power networks are derived accordingly.     

基于智能卡的高效远程口令识别方案

为了克服现有远程口令识别方案的缺陷，提出了一种基于离散对数和ElGamal公钥体制、用智能卡实现的远程口令识别方案．在此方案中，合法用户在注册阶段可以自由地选择自己的口令，在口令验证阶段服务器端无须存放用户的口令验证表．该方案可以抵御伪造攻击和重传攻击。     

多层结构及分布式PowerBuilder的实现

讨论了分布式多层应用体系的结构、特点及实现技术,介绍了分布式PowerBuilder结构,并详细说明了如何用PowerBuilder7.0具体地实现多层结构应用系统.     

农村客运站建设与管理模式的创新

针对目前农村客运站建设与管理中存在的客运站点建设跟不上发展、客运市场经营主体混乱等问题,提出合理安排农村客运站点布局的原则以及"站所合一"、"三定四统一"等管理模式,以扭转农村客运市场的混乱局面。     

基于支撑树法的高速公路多路径识别问题研究

随着高速公路的不断建设,开始出现环路,路网密度不断增大,由此产生两点之间车辆行驶的多路径识别问题,是高速公路联网收费及管理中迫切需要解决的问题。通过深度优先搜索算法搜索出需要在交通网络中添加标识站的路段,把交通网络网状结构图转化为支撑树树状结构图,从而实现多路径的识别。     

船舶电站模拟器的信号采集

介绍了船舶仿真电站中模拟量和开关量统一输入的一种实现原理,并简要说明输入通道与计算机间的信息交换过程.     

新建单线铁路车站股道数的设置

采用单线铁路车站股道数的简单分析模型、排队论分析模型和模型分析模型，分别就技术站、限制区间两端车站、一般会让站等不同类型的车站股道数进行了分析。确定股道数量时，应满足技术停站、限制区间、远期规划及旅客列车提速要求。     

遥感技术在哈尔滨市数字城市规划中的应用

对遥感技术在哈尔滨市数字城市规划中的应用进行了分析,其应用主要包括城市空间布局信息分析、城市变化监测、城市规划实施情况检查三方面,对应用的内容、方案及效果进行了总结和探讨。分析表明,遥感技术能为城市规划提供许多基础数据,具有广阔的应用前景。