Collision avoidance timing analysis of DSRC-based vehicles

Dedicated short-range communication (DSRC) has been used in prototyped vehicles to test vehicle-to-vehicle communication for collision avoidance. However, there is little study on how collision avoidance software should behave to best mitigate accident collisions. In this paper, we analyse the timing of events and how they influence software-based collision avoidance strategies. We have found that the warning strategies for collision avoidance are constrained by the timing of events such as DSRC communication latency, detection range, road condition, driver reaction and deceleration rate. With these events, we define two collision avoidance timings: critical time to avoid collision and preferred time to avoid collision, and they dictate the design of software-based collision avoidance systems.     

一种具有三维空间自重构能力的新型模块可避障运动仿真研究

提出一种具有三维空间重构能力的新型模块化自重构机器人,根据不确定目标构型的机器人重构运动规划策略,对机器人模块及其周围环境进行描述;采用三维相对方位描述方法,建立了机器人可避障运动规则库,并结合VC＋＋与Open GL技术开发了基于可避障运动规则库的机器人仿真运动平台,验证了该方法的高效性。     

Deltamethrin- and spinosad-mediated survival,activity and avoidance of the grain weevils Sitophilus granarius and S. zeamais

The granary and maize weevils are serious worldwide threats to stored products and their control has heavily relied on synthetic insecticides, which are largely recommended based on studies with acute lethal doses neglecting the importance of potential sublethal effects of insecticides. Deltamethrin has been widely used for managing grain weevils and other stored grain pest species, but reported control failures with this insecticide sparked the search for alternative insecticidal compounds. The bioinsecticide spinosad is one of such alternatives whose use against stored grain insect pests is relatively recent, but encompasses the control of grain weevils. Nonetheless, little is known about the sublethal effects of spinosad on these insect pest species. Here we assessed the insecticidal effects of commercial formulations of spinosad and deltamethrin against the weevil species Sitophilus granarius and S. zeamais. Both spinosad and deltamethrin were able to effectively control the insects, although the latter caused a faster mortality than the former. Behavioral pattern changes were caused by both insecticides, especially deltamethrin, triggering irritability (i.e., avoidance after contact). Different feeding and drinking responses were also detected for both weevil species, which exhibited significant avoidance to deltamethrin and to spinosad, but with a milder response to the latter. Apparently spinosad is not as easily recognizable as deltamethrin by S. zeamais and S. granarius, remaining effective against both species without minimizing as much the potential exposure as deltamethrin.     

齐次群上次椭圆超抛物障碍问题的Caccioppoli不等式和高阶可积性

通过构造合适的试验函数,建立弱解的表示公式,并利用奇异积分估计证明齐次群上一类二阶非线性次椭圆超抛物方程障碍问题弱解的Caccioppoli不等式和高阶可积性结果.推广了欧氏空间中超抛物障碍问题的相应结果.     

基于ARM的家用智能垃圾桶设计

以ARM11 S3C6410为核心设计了一种家用智能垃圾桶,用拾音器作为声音传感器,采用延时估计法实现声源方位的实时检测,从而实现语音控制垃圾桶的运动;采用红外传感器实现垃圾桶行进的蔽障功能;同时,采用语音识别技术实现用户对垃圾桶的前、后、左、右行驶或开启、关闭垃圾桶盖等各种语音指示的识别。从而实现垃圾桶的智能化与人性化,给生活带来便利。     

不同用量和种类炭黑对热塑性聚烯烃弹性体胶料性能的影响

研究不同用量和不同种类炭黑(导电炭黑CSX946和VXC72以及炭黑N550)填充热塑性聚烯烃弹性体(POE)胶料的导电性能和物理性能.结果表明:在试验的炭黑用量范围(30～80份)内,随着导电炭黑CSX946用量的增大,POE胶料的体积电阻率降低,邵尔A型硬度和100％定伸应力增大,拉伸强度和拉断伸长率呈减小趋势,当...     

拥塞窗口自适应的TCP拥塞避免算法

针对TCP Reno拥塞避免阶段拥塞窗口增长不够平滑的缺陷,在研究分析TCP Reno拥塞控制算法的基础上,提出一种基于拥塞窗口自适应调整增长因子的拥塞避免新算法——在拥塞避免阶段采用压缩特性的对数增长因子函数。在网络情况良好阶段,该因子增长速率大,以充分利用网络资源;而在逼近网络拥塞阶段,该因子以较小的速率增长,以避免过激的拥塞丢包。数学分析说明了新算法的可行性,并通过NS仿真对其吞吐量、公平性、友好性进行评估。仿真结果表明该改进的TCP拥塞避免算法的有效性。     

煤矿环境探测救灾机器人自主避障研究

为了实现煤矿环境探测救灾机器人的自主行走,在其周围布置6个固定探测距离为24 cm的GP2Y0D21YK型红外开关和6个测量范围为10～80 cm的GP2D12型红外测距传感器对障碍物进行探测识别。机器人对障碍物进行坐标计算和记录存储,并通过人工势场方法实现自主避障行走。试验结果表明,两种传感器的相互结合大大提高了机器人的避障效果和智能性。     

Nostalgia as a repository of social connectedness: The role of attachment-related avoidance.

Individuals who are low (compared with high) in attachment-related avoidance rely on social bonds to regulate distress, and the authors hypothesized that nostalgia can be a repository of such social connectedness. Studies 1–3 showed a positive association between loneliness and nostalgia when attachment-related avoidance was low, but not when it was high. Study 4 revealed that low-avoidance individuals derived more social connectedness from nostalgia than did high-avoidance individuals. Study 5 extended these findings and demonstrated that, in addition to being a source of social connectedness, nostalgia increased participants’ perceived capacity to provide emotional support to others. As in the case of social connectedness, this beneficial effect of nostalgia was significantly stronger when attachment-related avoidance was low (compared with high). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

未知环境下基于可拓策略的路径规划

摘要：将可拓策略应用于移动机器人路径规划,提出了一种新的路径规划算法。该方法在绕障时引入临时目标,模拟了人在未知环境中的路径选择,使得环境信息得到有效压缩,避免了在实时计算过程中对复杂环境的建模。基于安全距离的关联函数得到的评价函数,使得所选路径更加平滑,并且降低了对机器人自身控制及传感器测量精度的要求。由于拟人策略的鲁棒性,极大地缓解了其他传统方法的振荡及局部最小现象。实验及仿真均表明该方法实时性好,规划所得路径优于已有方法。