Livestock Frontiers

Impossible Frontiers

A key result of the Capital Asset Pricing Model (CAPM) is that the market portfolio— the portfolio of all assets in which each asset’s weight is proportional to its total market capitalization—lies on the mean-variance-efficient frontier, the set of portfolios having mean-variance characteristics that cannot be improved upon. Therefore, the CAPM cannot be consistent with efficient frontiers for...

Frontiers Conferences

Neural prostheses, or brain-computer interfaces (BCIs), have the potential to substantially increase quality of life for people suffering from motor disorders, including paralysis and amputation. These systems translate recorded neural signals into control signals that guide a paralyzed arm, artificial limb, or computer cursor. Although current laboratory demonstrations provide a compelling pro...

Discrete Frontiers

Many applications require to extract the surface of an object from a discrete set of valued points, applications in which the topological soundness of the obtained surface is, in many case, of the utmost importance. In this paper, we introduce the notion of frontier order which provides a discrete framework for defining frontiers of arbitrary objects. A major result we obtained is a theorem whi...

NEW FRONTIERS IN ANGIOGENESIS New Frontiers in Angiogenesis

Differential Characteristics of Efficient Frontiers in DEA with Weight Restrictions

The non-differentiability and implicit definition of boundary of production possibility set (PPS) in data envelopment analysis (DEA) are two important difficulties for obtaining directional characteristics, including different elasticity measures and marginal rates of substitution. Also, imposing weight restrictions in DEA models have some shortcomings and misunderstandings. In this paper we ut...