this research identifies returns to scale (rts) of efficient decision making units (dmus) with desirable (good) and undesirable (bad) inputs and outputs by presenting a new dea (data envelopment analysis) approach. in this study, we first introduce a new input-output oriented model to determine efficient dmus in the presence of undesirable factors and then, returns to scale of these dmus are es...

As ideological and political education workers in universities, we have the historical mission of cultivating college students’ socialist ideology moral character with Chinese characteristics, shaping ideal personality characteristics new era, guiding them to practice behavior era. This requires universities ideals, a correct view life, patience. We need do our work carefully solidly, ensure th...

Block-oriented models are popular in nonlinear modeling because of their advantages to be quite simple to understand and easy to use. Many different identification approaches were developed over the years to estimate the parameters of a wide range of block-oriented models. One class of these approaches uses linear approximations to initialize the identification algorithm. The best linear approx...