With the growing demand of radio resources, maximizing spectrum efficiency becomes increasingly important. Traditional static spectrum allocation lacks effective mechanisms for sharing spectral resources. Through adaptive resource allocation, spectrum agility allows the radio devices to dynamically use the idle spectral band and is becoming increasingly attractive because it can provide a large...

Recently a near field measurement approach has been proposed to deal with inverse ocean acoustics. It uses the near field of the scattered wave instead of the far field pattern. In this paper we justify how this near field of the scattered wave can be determined by the given Green’s function on some surface surrounding the object to detect. This justifies the usual measurements in ocean acousti...

Dense deployments of hybridWLANs result in high levels of interference and low end-user throughput. Many frequency allocation mechanisms for WLANs have been proposed by a large body of previous studies. However, none of these mechanisms considers the load that is carried by APs in terms of channel conditions, number of affiliated users as well as communication-load, in conjunction. In this pape...

The current study determined in healthy subjects (n = 16) whether size adaptation occurs at early, i.e., preattentive, levels of processing or whether higher cognitive processes such as attention can modulate the illusion. To investigate this issue, bottom-up stimulation was kept constant across conditions by using a single adaptation display containing both small and large adapter stimuli. Sub...

A fundamental problem in cellular communications systems is the adaptation of the frequency allocation to the traffic fluctuations. Traffic adaptation may be achieved by a computationally efficient solution to the following problem: “Given the radio spectrum available, the cell structure, the current traffic conditions, and an already established allocation of frequencies to cells, find a new o...

In this paper, we address the general case of a coordinated secondary network willing to exploit communication opportunities left vacant by a licensed primary network. Since secondary users (SU) usually have no prior knowledge on the environment, they need to learn the availability of each channel through sensing techniques, which however can be prone to detection errors. We argue that cooperat...

There is high-level political support for the use of green infrastructure (GI) across Europe, to maintain viable populations and to provide ecosystem services (ES). Even though GI is inherently a spatial concept, the modern tools for spatial planning have not been recognized, such as in the recent European Environment Agency (EEA) report. We outline a toolbox of methods useful for GI design tha...