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In this paper we give an introduction to the mathematical foundations of the optical waveguide design. A survey of the main results of the spectral theory of the Schr¨odinger operator on the line having compactly supported potential, with particular emphasis on the case of piece-wise constant potential is presented. This theory is then applied to the optical waveguide design problem of a piece-wis
Abstract in Spanish El documento analiza la evolución que ha tenido la cooperación internacional con Centro América e identifica los retos futuros que enfrentarán las agencias bilaterales en el marco de la era global y el cumplimiento de los Objetivos de Desarrollo del Milenio. Para ello se describen las características principales de cuatro etapas por las cuales ha transitado dicha cooperación en
Using well-established time domain methods, Sommerfeld’s classical results for the forerunner (the first precursor) at distant points in a homogeneous, isotropic, and dispersive half-space are generalized to the stratified, isotropic, and bi-isotropic slab cases, with arbitrary transient, normally incident, plane wave excitation. The results hold at each point and impedance mismatch cases are trea
Managing the resources of a virtualized data-center is a key issue in cloud computing. Existing research mostly assumes that applications are either allocated the required resources or fail. Combined with the fact that most cloud applications have dynamic resource requirements, this imposes a fundamental limitation to cloud computing: To guarantee on-demand resource allocations, the data-center ne
Regular column on theatre in the weekly newspaper Arbetaren (The Worker).
Speaker age is an important speaker-specific quality, which was investigated in the two studies presented here. The first study automatically extracted 161 acoustic features from six words produced by 527 speakers, and used normalised mean values to compare the features. Segment duration and sound pressure level (SPL) range were identified as two important acoustic correlates of age. The second study
The purpose of the risk management process, RiskUse is to provide practitioners, mainly risk managers with a software risk management process that has a well-defined user perspective. The aim is to present a risk management process that allows the development organisation to perform adequate risk management activities that can ensure that the developed software is safe from a user perspective.
