It is shown that the two-by-two Jones-matrix formalism for polarization optics is a six-parameter two-by-two representation of the Lorentz group. The attenuation and phase-shift filters are represented respectively by the threeparameter rotation subgroup and the three-parameter Lorentz group for two spatial and one time dimensions. It is noted that the Lorentz group has another three-parameter ...

In this paper, we used a two-phase exploratory sequential design consisting of qualitative and quantitative research methods and analysis to assess leadership coaching as a leader and leadership development practice. First, we addressed the need for appropriate outcome variables for leadership coaching. Analysis of a focus group study combined with a review of theory resulted in hypotheses link...

This article discusses the problem of choosing a regularization parameter in the group Lasso proposed by Yuan and Lin (2006), an l1-regularization approach for producing a block-wise sparse model that has been attracted a lot of interests in statistics, machine learning, and data mining. It is important to choose an appropriate regularization parameter from a set of candidate values, because it...