基于投影图像分布特征的车牌定位算法研究与实现

汽车牌照的自动定位是智能交通系统中的重要组成部分之一，是实现车牌识别（LPR）系统的关键一步．针对不同背景和光照条件下的车辆图像，提出了一种先利用扫描行跳变点数据得到图像的水平投影图，再通过突出图像列的边缘特征得到垂直投影图从而提取出车牌的方法．理论分析及实验结果表明该方法是非常有效的，准确率高、鲁棒性好，具有较好的实用价值．     

投影法在舰艇防空火力分配中的应用

目标威胁判断是根据目标态势判断对我的威胁程度,是现代作战指挥决策系统的核心内容。对空袭目标威胁度进行合理排序是提高防空效能的重要因素。文章分析了影响空袭目标威胁度的各种因素,采用投影法并通过实例．给出了具体的计算过程。     

Modeling and simulation of vehicle projection arrival–discharge process in adaptive traffic signal controls

Real‐time signal control operates as a function of the vehicular arrival and discharge process to satisfy a pre‐specified operational performance. This process is often predicted based on loop detectors placed upstream of the signal. In our newly developed signal control for diamond interchanges, a microscopic model is proposed to estimate traffic flows at the stop‐line. The model considers the traffic dynamics of vehicular detection, arrivals, and departures, by taking into account varying speeds, length of queues, and signal control. As the signal control is optimized over a rolling horizon that is divided into intervals, the vehicular detection for and projection into the corresponding horizon intervals are also modeled. The signal control algorithm is based on dynamic programming and the optimization of signal policy is performed using a certain performance measure involving delays, queue lengths, and queue storage ratios. The arrival–discharge model is embedded in the optimization algorithm and both are programmed into AIMSUN, a microscopic stochastic simulation program. AIMSUN is then used to simulate the traffic flow and implement the optimal signal control by accessing internal data including detected traffic demand and vehicle speeds. Sensitivity analysis is conducted to study the effect of selecting different optimization criteria on the signal control performance. It is concluded that the queue length and queue storage ratio are the most appropriate performance measures in real‐time signal control of interchanges. Copyright © 2010 John Wiley & Sons, Ltd.     

机械工程制图课程教法探索及教具设计

学生对投影理论和三视图相关知识的掌握情况,是决定学生能否正确绘制图样以及识读图样的关键.为研究高职学生对投影理论和三视图知识的掌握情况,本文首先分析了《机械工程制图》课程的特点;其次使用抽样调查法对汽车检测与维修技术专业学生进行学情的问卷调查;然后对《机械工程制图》课程的授课万式进行了探索;最后利用CREO三维建模软件...     

Competitiveness prioritisation of container ports in Asia under the background of China’s Belt and Road initiative

ABSTRACT

The understanding of the competitiveness of different ports under the background of China’s “Belt and Road Initiative” (BRI) is critical for drafting appropriate plans and taking suitable actions to select the best port in the logistics supply chains. A novel Multi-Attribute Decision Analysis (MADA) was proposed for the evaluation of port competitiveness. In the developed MADA method, the interval Analytic Hierarchy Process and the projection method was combined for the evaluation of port competitiveness. Three container ports in Asia including Shanghai, Hong Kong, and Singapore were studied under the background of China’s BRI. The results demonstrate that the port of Singapore is the most competitive at the initial stage of China’s BRI, followed by Hong Kong and Shanghai in the descending order. The results were validated by sum weighted method and Technique for Order Preference by Similarity to an Ideal Solution method, and sensitivity analysis was also carried out. The competitiveness of the three ports in the next ten years were also studied with the consideration of the influences of China’s BRI, and the results reveal that Shanghai port can even exceed Hong Kong port and Singapore port if it can effectively take the advantage s of China’s BRI.     

基于灰关联投影法的岩爆烈度分级预测研究

岩爆是高应力区开挖过程中常见的地质灾害,具有突发性和极强的破坏性,因此岩爆烈度分级预测一直是岩爆课题研究的重点。基于灰关联投影法的基本理论,综合分析影响岩爆发生的主要因素以及现有的岩爆评价指标体系,选取最大切应力与单轴抗压强度比值σθ/σc、岩石脆性系数σc/σt(单轴抗压强度与单轴抗拉强度比值)、围岩弹性储能系数Wet及岩石完整性系数Kv 4个指标,采用熵权理论确定指标权重,并运用灰关联投影法进行灰关联投影值计算和分级,从而预测出岩爆烈度等级。利用国内外多组典型工程实例对方法的可行性及适用性进行验证,将所得结果与熵权－正态云模型、RS－TOPSIS模型及实际情况进行对比。研究结果表明： 灰关联投影法用于岩爆烈度分级预测具有较高的准确性,且原理简单,运用方便,具有一定的工程应用前景。     

基于OpenGL的图像浏览器的开发

文章介绍了OpenGL作为图形开发平台的特点,提出了以OpenGL为图形平台来开发图像浏览器,并将此方法同当前市场上通用图形浏览器开发方法进行比较,指出该方法优势所在。文中还阐述了基于OpenGL的图像浏览器的原理设计,并使用VC作为开发语言对设计过程的实现方法和其中的关键技术作了详细的分析。