I review two papers, addressing the issue of competition and quality determination in the market for Internet access services (Crémer, Rey, and Tirole (2000), Foros and Hansen (2001)). These two works come to seemingly opposite conclusions. After having summarized the two papers, I try to...

Although verbal and numerical scales are commonly used in the Analytic Hierarchy Process for pairwise comparisons, new experiments with computer-based visual tools confirm that ratio preferences can be effectively and efficiently elicited using adjustable visual tools and simultaneous...

Service-oriented architecture (SOA) supply methods for systems development and integration where work interoperable services. A SOA suppose application functionality distribution in distinct units called services that communicate with each other. This ser

We investigate the time evolution of the roughness of Kadar–Parisi–Zhang (KPZ) equation in (2+1) dimensions. Scaling behavior of the roughness is analyzed from scale transformations and the scaling function is obtained from numerical simulations.

We study kink states of quantum, ferromagnetic, easy axis spin 12 chains at zero temperature. These are produced by applying opposite magnetic fields on the two end sites of the chain. For sufficiently strong anisotropy and boundary field, we obtain estimates on the wave function of the lowest...