“Geomagnetically induced currents” (GIC) in ground-based technological networks are a manifestation of space weather. GIC are a potential source of problems to the systems and therefore important in practice. GIC in a power system (or in principle in any other discretely-earthed system) can be calculated conveniently by using matrix equations presented earlier. Since temporal variations associa...

vi Foreword University of Cagliari vii Foreword Since my M.Sc. dissertation [SR02], I have focused my research interest in the Information and Communication Technology field, with regard on the communication network resources optimization. While in [SR02] I have analysed a single network component (a multi-service switch), in this Ph.D. dissertation I have enlarged my focus to entire infrastruc...

This paper elucidates the potential of LiDAR data for information generation for security applications. The study is embedded in the EU Network of Excellence GMOSS. General, security applications cover a large area from infrastructure monitoring (e.g. power stations, pipelines) or border monitoring to less tangible threats like terrorism and civil security / homeland security. It is demonstrate...

We use several variants of the detrended fluctuation analysis to study the appearance of long-term persistence in temperature records, obtained at 95 stations all over the globe. Our results basically confirm earlier studies. We find that the persistence, characterized by the correlation C(s) of temperature variations separated by s days, decays for large s as a power law, C(s) approximately s(...

We consider the load balancing and coverage problem of femtocell networks in indoor environment. We propose a novel framework exploiting the Voronoi diagram with respect to the radio propagation distance. Our initial power assignment scheme achieves maximal indoor coverage with minimized maximum required transmit power, which results in reduced interference. Our approach can adopt any radio pro...

A virtual power plant takes advantage of interactive communication and energy management systems to optimize and coordinate the dispatch of distributed generation, interruptible loads, energy storage systems and battery switch stations, so as to integrate them as an entity to exchange energy with the power market. This paper studies the optimal dispatch strategy of a virtual power plant, based ...

The structural integrity of the rotors of wind power stations can be monitored by a variety of sensors. However, the power supply of the employed sensors should not be connected by cable because lightning strikes are provoked that way. Therefore, energy harvesting systems are an interesting alternative. Three concepts for electrical power generation by harvesting the energy from the movements i...

To support battery powered mobile broadband wireless access devices efficiently, IEEE 802.16e defines a sleep mode operation for conserving the power of mobile terminals. In this paper we propose a theoretical Phase-type (PH) based Markov chain model to analyze the performance of IEEE 802.16e sleep mode operation. The model describes the behavior of the mobile stations working in sleep mode. In...

The optimal modes of the existing compensating devices under operating conditions were determined. Minimum power and energy losses taken as optimality criteria. unconstrained optimization problem was considered, i.e., finding absolute minimum. When solving to find mode operation “SUV OKOVA” network, a relative minimum found since system constraints has nonlinear form. conditional in terms react...

This paper investigates the nature of competition in the retail gasoline market using a two year panel data of weekly prices for gas stations in San Diego county. The primary dimension of product differentiation in the retail gasoline market is spatial in the sense that a gas station’s market power depends on the locations of all other gas stations. In contrast to previous empirical studies, I ...