  We analyze pseudogap phenomena widely observed in the underdoped cuprates. We
assume the existence of a strong d-wave pairing force competing with
antiferromagnetic(AFM) fluctuations and the formation of flat and damped
dispersion around the $(\pi,0)$ and $(0,\pi)$ region as two important elements
caused by the proximity from the Mott insulator. Using the mode-mode coupling
theory for the d-wave superconducting(dSC) and AFM fluctuations, we reproduce
basic properties of the pseudogap seen in the magnetic resonance, neutron
scattering, angle resolved photoemission and tunneling measurements in the
cuprates. Then minimal requirements to understand the pseudogap phenomena are
clarified as the above two elements. A strong competition of the pairing with
the antiferromagnetic fluctuations suppresses the transition temperature
thereby generates the pseudogap in the underdoped region while the weakness of
the AFM fluctuations leads to the absence of the pseudogap at the optimal
doping concentration.}
