In Modern Chinese, ‘Checked tone(入聲)’ usually refers to the ‘tone Category(調類))’ derived from the ‘Checked tone’ in Middle Chinese.
‘Nanchang Dialect’ means the dialects which are used at Nanchang- city(南昌市) and surrounding counties in Jiangxi-province(江西省). The terminal sounds(韻尾) in Checked-tone has started disappearing in this dialect, and the change of the terminal sounds carries on, for the hierarchies among the related constrains has changed.
First, because markedness constraints(*-p]σ & *[+mid][-back]&k) prohibiting all of the ‘-p’ and a part of ‘-k’ dominate faithfulness constraint(Ident(PlaceF)) that preserves place features in obstruent terminal sounds, all of the ‘-p’ and ‘-k’ behind the essential vowel ‘ɛ(e)’ has changed into ‘-t’. But ‘-p’ and ‘-k’ can’t change into ‘-ʔ’, for the constraint ‘*[-oral]]σ’ has dominant ranking over the constraint ‘Ident (PlaceF)’.
Second, ‘-k’ behind essential vowel ‘u, o, ɔ, a, ɑ’ has changed into ‘-ʔ’, since the hierarchical ranking has been reversed between *-p]σ and ‘*[-oral]]σ’.