The single-period problem (SPP), also known as the newsboy or news-vendor problem, is to ®nd the order quantity which maximizes the expected pro®t in a single period probabilistic demand framework. Interest in the SPP remains unabated and many extensions to it have been proposed in the last decade. These extensions include dealing with di€erent objectives and utility functions, di€erent supplie...

** The research reported in this paper was partially supported by grants from the U.S. Department of Education to the Consortium for Policy Research in Education (Grant # OERI-R308A60003), the National Science Foundation’s Interagency Educational Research Initiative (Grant # REC 9979863), and the Atlantic Philanthropies. Opinions expressed in this paper are those of the author, and do not neces...

The purpose of the paper is twofold. I first outline a philosophical theory of concepts based on conceptual role semantics. This approach is explicitly intended as a framework for the study and explanation of conceptual change in science. Then I point to the close similarities between this philosophical framework and the theory theory of concepts, suggesting that a convergence between psycholog...

The details of what constitutes the majority of the mass that makes up dark matter in the Universe remains one of the prime puzzles of cosmology and particle physics today-80 y after the first observational indications. Today, it is widely accepted that dark matter exists and that it is very likely composed of elementary particles, which are weakly interacting and massive [weakly interacting ma...

We propose a computable Galois-connection between Myers-Briggs’ Type Indicators (MBTIs), the most widely-used personality measure for non-psychiatric populations (based on C.G. Jung’s personality types), and Szondi’s personality profiles (SPPs), a less well-known but, as we show, finer personality measure for psychiatric as well as non-psychiatric populations (conceived as a unification of the ...

We consider the interaction of gravity, as expressed by Einstein’s Equations of General Relativity, to other force fields. We describe some recent results, discussing both the mathematics, and the physical interpretations. These results concern both elementary particles, as well as cosmological models. (This paper describes joint work variously done with with F. Finster, N. Kamran, B. Temple, a...

Building on previous research, which indicated that scintillation cells perform differently at different elevations (Burkhart, 2005; Eberline, 1989; George, l983), a pressure chamber has been designed which allows for the simulation of scintillation cell use at different "elevations." The pressure chamber has been constructed in such a way as to accommodate a large flexible bag that is filled w...

We present a rigorous description of chemical space within a molecular grand-canonical ensemble multi-component density functional theory framework. A total energy density functional for chemical compounds in contact with an electron and a proton bath is introduced using Lagrange multipliers which correspond to the energetic response to changes of the elementary particle densities. From a gener...

The common behaviour of a wave is determined by wave parameters of its medium, which are generally associated with the characteristic oscillations of its corresponding elementary particles. In the context of metamaterials, the decoupled excitation of these fundamental oscillations would provide an ideal platform for top-down and reconfigurable access to the entire constitutive parameter space; ...