\u3ci\u3eThe Song of the Stars above Ladywood\u3c/i\u3e

Oh when the Mother made the world, We sang, we sang

Productivity improvement in Korean rice farming: parametric and non-parametric analysis

The published empirical literature on frontier production functions is dominated by two broadly defined estimation approaches – parametric and non‐parametric. Using panel data on Korean rice production, parametric and non‐parametric production frontiers are estimated and compared with estimated productivity. The non‐parametric approach employs two alternative measures based on the Malmquist index and the Luenberger indicator, while the parametric approach is closely related to the time‐variant efficiency model. Productivity measures differ considerably between these approaches. It is discovered that measures of efficiency change are more sensitive to the choice of the model than are measures of technical change. Both approaches reveal that the main sources of growth in Korean rice farming have been technical change and productivity improvements in regions of the country that have been associated with low efficiency.Crop Production/Industries, Productivity Analysis,

Superpotentials of N=1 Supersymmetric Gauge Theories from M-theory

We consider brane configurations in M-theory describing N=1 supersymmetric gauge theories and using the parametric representation of the brane configurations, we calculate the superpotentials for various cases including multiple gauge groups or fermions. For SU(n) N=1 SQCD with $N_f$ fermion case ($N_f < N_c)$, we find that the superpotential from M-theory and the gauge theory agree precisely. This gives a direct evidence of the validity of Witten's M-theory method for calculating the super potential.Comment: 15pages, latex, typos corrected, a line regarding M\"obius transformation in page 4 and angle dependence in page 12 correcte