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Latency of available channel state information (CSI) at the transmitter in time-varying channels greatly affects the performance of multiple-input multiple-output (MIMO) systems. We have derived a simple algorithm to calculate an approximation of the expected performance loss based on the most recent channel feedback. The proposed algorithm can be used to determine the maximum tolerable channel fe
We propose a method for identifying and ranking critical components and sets of components in technical infrastructures. Criticality is defined as the vulnerability of the system to failure in a specific component, or set of components. The identification of critical components is increasingly difficult when considering multiple simultaneous failures, especially component failures with synergistic
The time-course and magnitude of fibre outgrowth from septal suspension grafts injected into the previously denervated hippocampal formation was monitored by measurements of choline acetyltransferase (ChAT), and the activity of the grafted neurons was assessed by measurements of [14C]acetylcholine (ACh) synthesis from [14C]glucose in vitro. Graft-derived ChAT activity was barely detectable 10 days
Lack of knowledge prevents us from exactly calculating the behavior of electromagnetic fields. We study two extremes in this respect: scattering against randomly distributed particles (no idea of the position or orientation of the scatterers), and random errors in antenna technology (small deviations from what we think are the proper parameters). Random variables are used to model our lack of knowl
There is growing concern about the possible hazards which can result from the use of certain organic building materials. The issue has received a great deal of attention in industrial countries in temperate climates, because indoor air pollution is frequent in tight, energy efficient buildings with low rates of ventilation. This is not yet a problem all over the world, but an awareness of the risk
This thesis presents photoluminescence (PL) spectroscopy studies of single III-V semiconductor quantum dots (QDs). The electronic properties of the QDs, as well as, the dynamics of the processes taking part inside and in the surroundings of the QDs have been studied by single quantum dot photoluminescence spectroscopy, time resolved spectroscopy, and correlation spectroscopy. A detailed overview o
Scaling the amount of resources allocated to an application according to the actual load is a challenging problem in cloud computing. The emergence of autoscaling techniques allows for autonomous decisions to be taken when to acquire or release resources. The actuation of these decisions is however affected by time delays. Therefore, it becomes critical for the autoscaler to account for this pheno
In most real world systems, objects vastly out- numbers threads. This paper shows how this characteristic can be used to implement eficient JavaTMmonitors in a way that reduces the num- ber of needed monitors to be equal to the number of threads, while fulfilling the Java™synchronized semantics. Some additional benefits related to prior- ity inheritance and hierarchical resource locking will also
