  To describe the small-scale intermittency of turbulence, a self-similarity is
assumed for the probability density function of a logarithm of the rate of
energy dissipation smoothed over a length scale among those in the inertial
range. The result is an extension of Kolmogorov's classical theory in 1941,
i.e., a one-parameter framework where the logarithm obeys some stable
distribution. Scaling laws are obtained for the dissipation rate and for the
two-point velocity difference. They are consistent with theoretical constraints
and with the observed scaling laws. Also discussed is the physics that
determines the value of the parameter.
