The Walfisch model predicts the average path loss from a conceptualised model of the propagation environment in which propagation is assumed to take place over rows of buildings of equal height and spacing. The propagation loss is then separated into that resulting from free space wavefront spreading, multiple forward-diffraction past the rows of buildings and diffraction over the final rooftop...

Model-free image segmentation approaches for automatic building detection, usually fail to detect accurately building boundaries due to shadows, occlusions and other low level misleading information. In this paper, a novel recognition-driven variational framework is introduced for automatic and accurate multiple building extraction from aerial and satellite images. We aim to solve the problem o...

Localization for mobile wireless sensor networks has been intensively studied in recent years due to its many applications in mobile networking as well as various public safety problems. However, the complexity of indoor radio propagation, especially when considering mobile users, makes indoor positioning a challenging task. This is mainly due to the severe multipath phenomenon where multiple c...

1. INTRODUCTION Recently, the studies on the scattering of electromagnetic waves by a cylindrically curved conducting open surface are becoming an important subject for a variety of applications [1]-[4]. When the geometrical ray or the creeping wave is incident on the edge of the cylindrically curved conducting open surface, the geometrical rays and the whispering gallery modes, which cling to ...

The analytical characteristics of a W/Si multilayer dispersion element (MLDE) with a nominal 2d spacing of 60,~ are assessed and compared with those of a conventional thallium acid phthalate (TAP) crystal for the determination of fluorine in silicate and phosphate minerals by electron microprobe. Measured count rates for fluorine were found to be up to fourteen times higher using the MLDE compa...

In recent years, diffusion tensor imaging (DTI) and its variants have been used to describe fiber orientations and q-space diffusion MR was proposed as a means to obtain structural information on a micron scale. Therefore, there is an increasing need for complex phantoms with predictable microcharacteristics to challenge different indices extracted from the different diffusion MR techniques use...

This paper presents results from the first double-directional measurements of the Multiple-Input Multiple-Output (MIMO) peer-to-peer radio channel in the 300 MHz frequency range. The measurements were performed with vertically polarized circular antenna arrays mounted on cars driving along a route in a semi rural and sub-urban environment. We evaluate the measurements with a high resolution alg...

Ultra-compact and tunable devices for terahertz (THz) beam manipulation are highly desired in wireless communication radar scanning. Although the appearance of Pancharatnam-Berry (PB) metasurface has provided strategies THz scanning, active output power distribution is still difficult to achieve, flexibility limited by a single metasurface. In this work, we demonstrated an all-dielectric cascad...

Successful prevention and control of the epidemic of noncommunicable diseases (NCDs) cannot be achieved by the health sector alone: a wide range of organisations from multiple sectors and across government must also be involved. This requires a new, inclusive approach to advocacy and to coordinating, convening and catalysing action across civil society, best achieved by a broad-based network. T...