远红外蔬菜脱水机链板换位分析与试验

针对原有远红外蔬菜脱水机存在的输送链板不能按时翻板落料这一问题,增设了拨板机构,并对输送链板的换向、换位过程进行了分析。试验证明,增设拨板机构之后的远红外蔬菜脱水机,能够顺利地实施前、后链板的左右交替换位,其换位率达99.9%以上,保证了各链板重叠处均有“后压前”这一准确的位置关系,使翻板落料得以顺利进行,从而大大提高了设备的运行可靠性。     

Safety-critical event risk associated with cell phone tasks as measured in naturalistic driving studies: A systematic review and meta-analysis

A systematic review and meta-analysis of naturalistic driving studies involving estimates of safety-critical event risk associated with handheld device use while driving is described. Fifty-seven studies identified from targeted databases, journals and websites were reviewed in depth, and six were ultimately included. These six studies, published between 2006 and 2014, encompass seven sets of naturalistic driver data and describe original research that utilized naturalistic methods to assess the effects of distracting behaviors. Four studies involved non-commercial drivers of light vehicles and two studies involved commercial drivers of trucks and buses. Odds ratios quantifying safety-critical event (SCE) risk associated with talking, dialing, locating or answering, and texting or browsing were extracted. Stratified meta-analysis of pooled odds ratios was used to estimate SCE risk by distraction type; meta-regression was used to test for sources of heterogeneity. The results indicate that tasks that require drivers to take their eyes off the road, such as dialing, locating a phone and texting, increase SCE risk to a greater extent than tasks that do not require eyes off the road such as talking. Although talking on a handheld device did not increase SCE risk, further research is required to determine whether it indirectly influences SCE risk (e.g., by encouraging other cell phone activities). In addition, a number of study biases and quality issues of naturalistic driving studies are discussed.     

自动拨测在集团客户短信业务网络监控中的应用研究

从集团客户短信业务网络特点出发,总结其网络监控的难点,提出利用自动拨测原理进行短信业务的端到端网络性能监控.通过搭建短信业务自动拨测系统,对短信业务网络进行轮询测试,获取端到端网络性能质量数据,能够在主动监控、故障预处理、故障定位、业务入网及网络调整后业务测试等方面发挥较好的作用,从而更好的监测网络的运行状况,提升客户服务感知.