This paper introduces improved design of signal warning device on active naval vessels.

本文介绍了现役舰船信号报警装置的改进设计。

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BEACON, a device which emits a signal for use as a guidance or warning aid.

信标，发射引导或警告用信号的装置。

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The final basic cause that resulted in the failure is no working state monitoring signal and failure warning signal of power supply source of controlled silicon excitation device.

最终查出造成机组事故的根本原因是可控硅励磁装置供电电源无工作状态监视信号及故障报警信号；

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In the video, the major appears to be upbraiding the soldier for not using a laser warning device to signal the approaching truck.

NPR: Insider Attack Kills 2 US Troops, 2 Afghans