城市干路行人过街警告标志前置距离研究

结合城市干路中行人过街安全问题,针对行人过街警告标志设置的前置距离问题进行研究。首先对驾驶员驾驶过程中的视认特征进行分析,并将其划分为不同阶段,其次根据不同阶段驾驶行为特征建立各阶段车辆行驶距离模型,并考虑停车安全距离,最终构建行人过街警告标志前置距离解析模型。最后,根据人机工程学原理进行驾驶模拟试验,测定相关数据,并对模型中各参数值大小进行标定。经计算得到不同速度、不同车道数下的行人过街警告标志前置距离,并给出建议距离。结果表明,当速度一致时,随着车道数增加,行人过街警告标志前置距离不断增大;当车道数一致时,随着速度增加,标志前置距离增大。研究结果可为城市干路行人过街警告标志设置提供参考。

Attention Strategy Training Affecting Second Language Vocabulary Acquisition of College Students

This paper analyzes attention theory in the cognitive psychology and introduces second language vocabulary acquisition. The filter theory and attention resource theory in the attention theory points out that attention has a key effect on the learner＇s cognitive vocabulary learning by raising students＇ expectations for new words, by increasing the frequency of exposure to them, by enhancing their perceptual salience, and by increasing the task demand for word study. The fact proves that enhancing attention in input could promote students＇ vocabulary acquisition and help them form efficient vocabulary learning strategy suitable for their levels of proficiency.