In order to avoid such accident, a warning system using passive infrared target detection was developed. It can search body targets in the mine cars and give sound and light warning as well. 为了避免此类事故，根据红外检测原理研制了被动式红外探测报警系统，以此对矿车里的人体目标进行检测，并作出声、光报警。
Design and application of KWD - ⅱ type voice and light warning system in underground mine turn KWD&Ⅱ型矿用弯道语音、灯光报警系统的研究与应用
Therefore, the patient uses the system can realis sound and the light warning function, information as bed number, call content and call time transmits functions and so on portable end which through the wireless network the master control center to the medical care personnel user. 因此，病人使用的便携端可以实现病人呼叫时的声、光报警功能，并将床号、呼叫内容和呼叫时间等信息通过无线网络传输到主控中心和医护人员使用的便携端等功能。
When the distance from the car to the other one is shorter than the given value, the preventer will give a sound and light warning signals, speed down and stop the car automatically. It is an ideal safety device to prevent vehicle from crash. 当两车相距达一定距离时，能发出声、光报警信号，井能自动减速和停车，是保证人身安全和防止车辆相撞的最佳装置。
Finally, relevant historical operational data in Hunan TS Expressway Project from 2003-2008 were collected. Through the risk early-warning model constructed, conclusions of light warning about single natural risk, economic risk and behavioral risk were extracted. 最后，搜集、整理2003-2008年湖南TS高速公路项目运营的有关历史资料，运用本文提出的风险预警模型，得出单项自然风险、经济风险、行为风险均为轻警的结论。
