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Single and double universal seesaw mechanisms and the hypothesis of universalstrength for Yukawa couplings are applied to formulate a unified theory offermion mass spectrum in a model based on an extended Pati-Salam symmetry. Fivekinds of Higgs fields are postulated to mediate scalar interactions amongelectroweak doublets of light fermions and electroweak singlets of heavy exoticfermions with relative Yukawa coupling constants of exponential form. At thefirst-order seesaw approximation, quasi-democratic mass matrices with equaldiagonal elements are derived for all charged fermion sectors and a diagonalmass matrix is obtained for the neutrino sector under an additional ansatz.Assuming the vacuum neutrino oscillation, the problems of solar and atmosphericneutrino anomalies are investigated.Comment: 13 pages, LaTeX; a reference adde

Single and Double Universal Seesaw Mechanisms with Universal Strength for Yukawa Couplings