Glass tables can be easily found in many dining areas. But people always complain that they are easily scratchable. Here my friend has tried to use normal plastic (which has very low hardness) to scratch the glass top, what I can observe is it actually give small damages to the surface...
If...
I'm new to the field of signal processing and currently reading a paper which it uses cross-correlation of two signals for detecting some machine failures. But I'm confused with the complex conjugate in the equations. Take equation from wikipedia as example:
(f\star g)(t)\equiv \int_{-\infty...