Sökresultat

Filtyp

Din sökning på "*" gav 529850 sökträffar

Random graph models and their applications

This thesis explores different models of random graphs. The first part treats a change from the preferential attachment model where the network incorporates new vertices and attach them preferentially to the previous vertices with a large number of connections. We introduce on top of this model the deletion of the oldest connections in the system and discuss the impact on the degree of the vertice

Interleaver structures for turbo codes with reduced storage memory requirement

This paper describes two interleaver structures that reduce the memory requirement for the storage of interleaver rules. The first structure offers memory reductions of more than 50%, compared to storing the entire interleaver vector. The second structure is useful when a range of interleaver sizes are to be stored, offering memory reductions asymptotically approaching 50%. By combining the two st

A fundamental problem of causation (with no solution)

Traditional views of causation are cause-effect views. Among other things, what is claimed is that when a causal report is true, a cause and an effect exist. Similarly with theories of causal beliefs, such as Gärdenfors's (1988) view that - by looking at the contraction with respect to the cause of the given epistemic state - we can apply the simple criterion that the occurrence of C raises the pr

System Identification Applied to Spatial and Temporal Propagation of Atrial Activity During Atrial Fibrillation

The purpose of the paper is to apply system identification methods to study spatial and temporal propagation of atrial activation along coronary sinus (situated in the posterior left part of the heart, in the groove between left atrium and left ventricle) during paroxysmal atrial fibrillation using data recorded from 7 different patients. Furthermore, interatrial mechanisms of impulse conduction c

A Frame Work for Process State Transitions: Grade Changes

In modern chemical process industry, process state transitions, orgrade changes, are common operations. For example, for a papermachine, a common operation is to change the surface weight of theproduced paper. In this case it is of importance that the transitionto the new grade is done fast, but without a breakdown asa result. This paper addresses this problem by combining optimizationtechniques a

Full electrification of Lund city bus traffic - A simulation study

Flexibla och ekonomiska system för eldrift av vägfordon är ett område med aktiv utveckling och forskning. Denna rapport tillämpar sådana system för drift av alla stadsbussar i Lund. En programvara för simulering och ekonomisk optimering av sådana system har utvecklats och några systemkonstruktioner presenteras. Ett försök till realistiska kostnader och resultat uppskattningar av de viktigaste kompFlexible and economic systems for full electric operation of road vehicles are an area of intense research and development. This report applies such systems to the operation of all city buses in Lund. Software for simulation and economic optimization of such systems is developed and a few system designs are presented. An attempt to a realistic cost and performance estimate of the main components i

Upper Extremity Disorders - Epidemiology and Measures of Disability

The aim of this thesis was to investigate the prevalence and characteristics of long-lasting upper extremity symptoms in a general population and to study some methodological aspects of outcome assessment and reporting, including validation of a Swedish version of an upper extremity region-specific outcome instrument that potentially could be useful for assessing upper extremity disorders. A gener