  Experiments of electron cyclotron resonance heating (ECH) power scan in KSTAR
tokamak clearly demonstrate that both the cut-off density for non-local heat
transport (NLT) and the threshold density for intrinsic rotation reversal can
be determined by the collisionality. We demonstrate that NLT can be affected by
ECH, and the intrinsic rotation direction follows the changes of NLT. The
cut-off density of NLT and threshold density for rotation reversal can be
significantly extended by ECH. The poloidal flow of turbulence in core plasma
is in the electron and the ion diamagnetic direction in ECH plasmas and high
density OH plasma, respectively. The auto-power spectra of density fluctuation
are almost the same in the outer region for both ECH and OH plasmas. On the
other hand, in the core region of ECH plasmas, the power spectra of the density
fluctuations are broader than those of OH plasma. All these observations in
macroscopic parameters and micro fluctuations suggest a possible link between
the macro phenomena and the structural changes in micro-fluctuations.
