wet-end and dry-end in Sonar

the science of sonar performance modeling is traditionally separated into a "wet end" comprising the disciplines of acoustics and oceanography and a "dry end" of signal processing and detection theory. 

source: Ainslie, Michael A. Principles of sonar performance modelling. Springer, 2010.

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wet end 에 대해 잘 알지도 못하면서 들이대는 것 같다는 생각이 들었다.