Deformed Boson Scheme including Conventional q-Deformation in   Time-Dependent Variational Method. IV
  Basic idea presented in Parts (I)-(III) for the deformed boson scheme is applied to the case of the su(2)- and su(1,1)-algebras for describing many-body systems consisting of four kinds of boson operators. A possible form of the coherent state given by the present authors is generalized and the su(2)_q- and the su(1,1)_q-algebras are obtained in the form expressed in terms of four kinds of boson operators. As an illustrative example of the application, the framework for describing thermal effects observed in two-level shell model under the pairing correlation is proposed. 
A.Kuriyama (Kansai Univ. Japan), C.Providencia (Univ. de Coimbra,   Portugal), J.da Providencia (Univ. de Coimbra, Portugal)...