Dr. Joonhee Lee and Dr. Lily Wang have published an article on “Investigating multidimensional characteristics of noise signals with tones from building mechanical systems and their effects on annoyance” in the January 2020 issue of the Journal of the Acoustical Society of America! The article presents more results from Joonhee’s PhD work at the University of Nebraska – Lincoln. Multidimensional scaling (MDS) results pointed the researchers towards including metrics for perception of tonality, loudness, and sharpness that improves the performance of earlier annoyance prediction models. A second study investigated noise stimuli with harmonic and inharmonic five-tone complexes between 125 Hz and 2 kHz to obtain a perceptual weighting function. Utilizing a proposed metric with the perceptual weighting function improves annoyance prediction to a similar degree as including sharpness.