The public's understanding of the functionality and limitations of automatic braking in Japan

Automated driving systems are increasingly widespread in the automotive industry. To operate automobiles that are assisted by such systems, drivers must correctly understand their functionality and limitations. Hence, focusing on the rapidly spreading technology of automated braking, this study seeks to clarify the general public's understanding of automatic braking systems. A total of 210 Japanese people responded to a questionnaire regarding how automatic brakes are operated, how they work, when they disengage, and so on. The proportion of those who misunderstood the operation of the system is not especially high, but there were a certain percentage of people who had misconceptions; e.g., some believed that automatic braking could detect pedestrians or bicycles. Moreover, respondents were under the impression that drivers cannot readily disengage automatic braking systems. If they mistakenly use the automatic brake, there is a possibility of posing a risk to the road transportation system.     

广州港——“突破”带来大空间

拥有两千年历史的广州港，曾是“海上丝绸之路”的始发港，商贾巨富纷至沓来，云集至此。如今的广州港以货物吞吐量3．4亿吨的强劲实力，在2007年全球港口货物吞吐量排行榜上居第5位；集装箱吞吐量达926万标准箱位居全国第五位，世界第十二位。     

Unsteady numerical simulation of flow around 2-D circular cylinder for high Reynolds numbers

In this paper, 2-D computational analyses were conducted for unsteady high Reynolds number flows around a smooth circular cylinder in the supercritical and upper-transition flow regimes, i.e. 8.21×10⁴<Re<1.54×10⁶. The calculations were performed by means of solving the 2-D Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with a k-? turbulence model. The calculated results, produced flow structure drag and lift coefficients, as well as Strouhal numbers. The findings were in good agreement with previous published data, which also supplied us with a good understanding of the flow across cylinders of different high Reynolds numbers. Meanwhile, an effective measure was presented to control the lift force on a cylinder, which points the way to decrease the vortex induced vibration of marine structure in future.     

基于Saber的LLC电路仿真分析

由于LLC电路的高效性、宽范围性、高电压增益等明显优势，而广泛使用在各种中小功率场所。针对LLC电路的多样性，采用了Saber对其进行仿真研究，全面分析其各个频率范围，同时在不同工作条件下的仿真结果，验证了LLC电压增益曲线的正确性。     

基于三视图的三维线框模型生成算法

依据画法几何学和工程制图的投影原理,介绍了一种基于三视图的线框模型快速生成算法。算法首先根据三视图的二维节点信息生成空间顶点,然后根据二维节点间的连接关系和投影原理来直接确定空间顶点间的连接关系,最后消除空间冗余元素并连接具有连接关系的三维顶点形成空间线框模型。     

基于无记忆非线性变换的相关非高斯雷达杂波的仿真

大量的实测数据表明,雷达杂波的分布特性明显偏离高斯分布。相关非高斯杂波的仿真主要包括对数正态、韦伯尔、K分布杂波的仿真。在杂波信号模拟中,需同时考虑杂波幅度概率分布和其相关特性。文中利用广义维纳过程的无记忆非线性变换法（ZMNL）来建模仿真,产生相关非高斯杂波。该仿真系统不仅可以实时动态地模拟实际采集的雷达杂波,而且可按给定的功率谱模型来产生满足非高斯分布的随机数据序列。仿真结果证明了此方法的有效性。     

预应力技术在箱梁加固中的应用

对既有桥梁的加固是桥梁建设可持续发展的重要举措,预应力技术由于其显著的优势,在桥梁加固工程中得到了广泛的应用.文中在简要介绍预应力加固原理与设计要点的基础上,结合申杭线大桥加固工程,重点介绍了体外预应力技术在桥梁上部结构加固中的应用.     

Safety assessment for a side-by-side offloading mooring system

In order to improve the safety properties of an offloading system with side-by-side (SBS) mooring in which the FPSO is moored by a yoke system in the field of BZ25-1, it is necessary to analyze those properties. According to the experience of similar projects, tow strategies of different offloading arrangements were discussed by using the 3-D radiation/diffraction theory and quasi-static time domain method to assess their respective safety properties. Through the safety assessment analysis of different arrangement comparisons, various ways to improve the safety properties of offloading systems with side-by-side mooring were verified by analyzing the tension in the mooring lines and the fender deflection. Through comparison it can be concluded that by enlarging the key factors properly, including the size of the fenders and the hawsers as well as the number of hawsers, a better safety performance can be achieved.     

岸桥前大梁副梁腹板裂纹成因分析及改进方案

主要讨论岸桥前大梁副梁四腹板出现纵向裂纹的原因,并根据前大梁相关附属构件的受力特性提出改进方案,实践证明此处刚性连接改为铰接是可靠的.