面向高速公路车辆切入场景的自动驾驶测试用例生成方法

为在自动驾驶汽车基于场景的测试中生成涵盖相应场景中复杂多变的真实交通运行过程的测试用例,从highD数据集中提取车辆切入场景的多个实际样本,通过分析运动参数和参与车辆之间的位置关系,建立车辆切入场景的描述模型,根据切入点的碰撞时间评估该方案的风险程度,并结合描述模型中参数的分布,采用蒙特卡罗方法生成测试用例。结果表明,生成的车辆切入测试用例能够覆盖所有风险等级,可较好地支持自动驾驶测试。     

北疆地区货运专线铁路站场设计特点研究

北疆地区地广人稀、自然条件恶劣、风力强劲频繁、降雨量稀少不均匀,存在瞬时洪水及风沙、风蚀、风吹雪等特殊不良地质现象,针对该地区独特的自然环境及地形地质特征,结合红柳河至淖毛湖铁路(货运专线铁路)设计实例,提出铁路站场设计应遵循的原则,根据上述不良地质形成的铁路病害成因及规律,在站址选择、站型、站场路基及车站房屋等方面,提出不同地形地质条件下铁路站场的特殊设计方案。     

Analysis of a consumer survey on plug-in hybrid electric vehicles

Plug-in Hybrid Electric Vehicles (PHEVs) show potential to reduce greenhouse gas (GHG) emissions, increase fuel efficiency, and offer driving ranges that are not limited by battery capacity. However, these benefits will not be realized if consumers do not adopt this new technology. Several agent-based models have been developed to model potential market penetration of PHEVs, but gaps in the available data limit the usefulness of these models. To address this, we administered a survey to 1000 stated US residents, using Amazon Mechanical Turk, to better understand factors influencing the potential for PHEV market penetration. Our analysis of the survey results reveals quantitative patterns and correlations that extend the existing literature. For example, respondents who felt most strongly about reducing US transportation energy consumption and cutting greenhouse gas emissions had, respectively, 71 and 44 times greater odds of saying they would consider purchasing a compact PHEV than those who felt least strongly about these issues. However, even the most inclined to consider a compact PHEV were not generally willing to pay more than a few thousand US dollars extra for the sticker price. Consistent with prior research, we found that financial and battery-related concerns remain major obstacles to widespread PHEV market penetration. We discuss how our results help to inform agent-based models of PHEV market penetration, governmental policies, and manufacturer pricing and marketing strategies to promote consumer adoption of PHEVs.     

水下滑翔机的研究现状与面临的挑战

随着海洋科学研究的加深,水下滑翔机作为一种新型的无人水下航行器在经济、军事方面的价值逐渐凸显。首先介绍了水下滑翔机的研究意义以及分类情况,对水下滑翔机的研究现状以及国内外取得的具有代表性的成果进行了概括调研。然后对水下滑翔机的发展进行了分析,最后对低功耗水下滑翔机未来发展面临的导航问题、能源问题、控制问题以及通讯问题进行了讨论,提出了水下滑翔机技术的发展方向建议。     

浅谈钻孔灌注桩的施工

介绍了钻孔灌注桩的施工工艺及注意事项。     

Autonomous vehicle control systems for safe crossroads

This article presents a cooperative manoeuvre among three dual mode cars – vehicles equipped with sensors and actuators, and that can be driven either manually or autonomously. One vehicle is driven autonomously and the other two are driven manually. The main objective is to test two decision algorithms for priority conflict resolution at intersections so that a vehicle autonomously driven can take their own decision about crossing an intersection mingling with manually driven cars without the need for infrastructure modifications. To do this, the system needs the position, speeds, and turning intentions of the rest of the cars involved in the manoeuvre. This information is acquired via communications, but other methods are also viable, such as artificial vision. The idea of the experiments was to adjust the speed of the manually driven vehicles to force a situation where all three vehicles arrive at an intersection at the same time.     

南京纬三路过江通道环境通风系统设计

纬三路过江通道为国内双管、双层水底盾构隧道中距离最长的项目。隧道建成后交通量增长迅速,为营造舒适乘车环境,对隧道的通风系统提出了严峻的挑战。结合该工程的实际特点,对其通风、温升等问题进行了介绍。     

Underwater Cultural Heritage Policies of the United States Coastal Zone

Domestic management of historic shipwrecks and other Underwater Cultural Heritage (UCH) resources located in the United States coastal zone is extensively fragmented and a portion of it has significant implications in terms of international law. In the United States coastal zone, UCH (largely historic shipwrecks) falls under one of three general regimes, depending on where the resource is located and subject to specific and individual requirements: the General Maritime Law, the Abandoned Shipwreck Act, and the Marine Protection, Research and Sanctuaries Act, also known as the Marine Sanctuaries Act. After examining the development of and current status of these regimes, this article will suggest policies for a stronger, more coordinated federal management regime in United States coastal waters. It will specifically argue that a recent decision by the United States Court of Appeals for the Fourth Circuit provides a well-designed paradigm that could be linked with pertinent aspects of the three identified regimes to create a unified coastal governance mechanism for sunken historic shipwrecks.     

多自主水下航行器编队控制技术研究

对多自主水下航行器编队任务进行了概述,针对编队问题和目前常用的编队方法,提出了基于领航者法的分层式编队控制技术,将人工势场法引入到编队控制行为中,提高了AUVs编队的协调性与协作性,增强了编队体系的环境自适应能力.最后,通过仿真实现了多种编队案例,验证了算法的合理性和实用性.     

高速公路除障车吊臂的可靠性分析

针对曾开发过的高速公路除障车进行了结构分析,就吊臂这一主要结构件,利用可靠性理论对其强度进行可靠性分析。在对吊臂进行可靠性分析过程中,除了借助传统的可靠性理论外,在对动载荷的确定上,利用了汽车平顺性理论;并且结合除障车的行驶路面情况,利用MATLAB对决定动载荷的振动加速度进行了仿真分析,使得计算结果更为真实可靠。