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A unified view of systems is suggested which relates to both model theory and relational databases. The approach towards a unified view is here centered around viewing a system as a structure of the form S = < A, R > putting focus on the relational aspects of the system concept. This is motivated by some examples of various systems which are shown to fit into the proposed unification.
Abstract in UndeterminedThe report is an evaluation of five years of Linnaeus-Palme exchange programme between the chemistry departments at University of Gothenburg, Sweden and University of the West Indies, Jamaica. The exchange programme gives students and teachers at the two universities the possibility to study and teach at the partner university to better understand the international implicat
The Mach number and pressure on the outlet plane of a straight micro-tube were investigated numerically for both laminar and turbulent flow cases. The numerical methodology is based on the Arbitrary-Lagrangian-Eulerian (ALE) method. The LB1 turbulence model was used for the turbulent flow case. The compressible momentum and energy equations with the assumption of the ideal gas were solved. The com
I Norge har den redan blivit en klassiker i två upplagor, 1997 och 2003. Nu kommer den på svenska. Den svenska redaktionen, hämtad från samtliga allmänmedicinska avdelningar inom de medicinska fakulteterna, har under ledning av Birgitta Hovelius bearbetat de inte mindre än 74 författarnas insatser. Resultatet är ett uppslagsverk som saknar motstycke. De 883 sidorna ger bredd, omfattning och en u
The possibility of using the channel reciprocity between the uplink and downlink channels in Frequency Division Duplex (FDD) systems to improve the efficiency has been deeply investigated. Previous studies have come to different conclusions for the characterization of the dissimilarity in uplink and downlink channel properties. This paper analyzes the mismatch in directional properties of the upli
This paper presents a study of the sensor network calibration time-difference-of-arrival (TDOA) measurements. Such calibration arise in several applications such as calibration of (acoustic or ultrasound) microphone arrays, bluetooth arrays, and radio antenna networks. We propose a non-iterative algorithm that apply a three-step stratification process, (i) using a set of rank constraints to determ
