SAT-GRD: An ID/Loc split network architecture interconnecting satellite and ground networks

Since the satellite network plays an irreplaceable role in many fields, how to interconnect it with the ground network has received an unprecedented attention. However, with much more requirements imposed to the current terrestrial network, many serious problems caused by the IP dual-role exposed. In this context, their direct interconnection seems not the most appropriate way. Thus, in this paper, SAT-GRD, an incrementally deployable ID/Loc split network architecture is proposed, aiming to integrate the satellite and ground networks efficiently. Specifically, SAT-GRD separates the identity of both the host and network from the location. Then, it isolates the host from the network, and further divides the whole network into core and edge networks. These make SAT-GRD much more flexible and scalable to achieve heterogeneous network convergence and avoid problems resulting from the overloaded semantics of IP addresses. In addition, much work has been done to implement the proof-of-concept prototype of SAT-GRD, and experimental results prove its feasibility.

Visual networking : keeping television on the box

The Australian National Broadband Network (NBN) is the largest infrastructure project ever proposed in Australia (NBN, 2010). Its Fibre to the Home open access network will see a new generation of telecommunications services providing the basis for technologies and services to be combined. Homes connected to the network will have access to new digital media and high-speed internet among other applications. Taking an Australian perspective, this paper focuses on the capacity for fast broadband to allow features and technologies to be combined that were once separate, but now have converged including computing, telephony, free-to-air (FTA) television, direct-to-home satellite broadcasting, radio, and the internet and the implications. Specifically, future services for digital television are going to be more akin to app-based functions that are currently available on mobiles and tablets but on the television screen rather than the PC. Against such a background, this article examines the future of television arguing that faster broadband and internet-enabled televisions to watch movies and shows when it suits the audience are the keys to the television’s survival.

Visual networking : Australia's media landscape

Australia is in the midst of a massive transformation of its communication infrastructure. The AUD43 billion Australian National Broadband Network (NBN) to be set up by the wholly Federal government-owned NBNCo Limited (NBNCo), is the largest infrastructure project ever proposed in Australia (NBN, 2010). It has the capacity to combine features and technologies that were once separate, but now have converged, including computing, telephony, free-to-air (FTA) television, direct-to-home satellite broadcasting, radio and the internet. This means that current thinking about these media technologies, developed through the process of convergence as well as regulation, requires review. Future services for digital television are going to be more akin to app-based functions currently available on mobiles and tablets but accessed via the television screen rather than the PC. Against such a background, this article examines the Australian ‘televisual’ space, arguing that faster broadband and internet-enabled televisions for movies, shows, communication and more, when it suits the audience, are the keys to television’s survival through visually networked possibilities.

Compact stacked planar inverted-F antenna for passive deep brain stimulation implants

A compact meandered three-layer stacked circular planar inverted-F antenna is designed and simulated at the UHF band (902.75 – 927.25 MHz) for passive deep brain stimulation implants. The UHF band is used because it offers small antenna size, and high data rate. The top and middle radiating layers are meandered, and low cost substrate and superstrate materials are used to limit the radius and height of the antenna to 5 mm and 1.64 mm, respectively. A dielectric substrate of FR-4 of εr= 4.7 and δ= 0.018, and a biocompatible superstrate of silicone of er= 3.7 and d= 0.003 with thickness of 0.2 mm are used in the design. The resonance frequency of the proposed antenna is 918 MHz with a bandwidth of 24 MHz at return loss of −10 dB in free space. The antenna parameter such as 3D gain pattern of the designed antenna within a skin-tissue model is evaluated by using the finite element method. The compactness, wide bandwidth, round shape, and stable characteristics in skin make this antenna suitable for DBS. The feasibility of the wireless power transmission to the implant in the human head is also examined.

Time cumulative complexity modeling and analysis for space-based networks

In this paper, the notion of the cumulative time varying graph (C-TVG) is proposed to model the high dynamics and relationships between ordered static graph sequences for space-based information networks (SBINs). In order to improve the performance of management and control of the SBIN, the complexity and social properties of the SBIN's high dynamic topology during a period of time is investigated based on the proposed C-TVG. Moreover, a cumulative topology generation algorithm is designed to establish the topology evolution of the SBIN, which supports the C-TVG based complexity analysis and reduces network congestions and collisions resulting from traditional link establishment mechanisms between satellites. Simulations test the social properties of the SBIN cumulative topology generated through the proposed C-TVG algorithm. Results indicate that through the C-TVG based analysis, more complexity properties of the SBIN can be revealed than the topology analysis without time cumulation. In addition, the application of attack on the SBIN is simulated, and results indicate the validity and effectiveness of the proposed C-TVG and C-TVG based complexity analysis for the SBIN.

Determining the professional sport broadcasting landscape : an Australian football club perspective

The professional sport broadcasting landscape has received much attention from an economic and legal perspective. While the economic and legal focus has been the predominant association with sport broadcasting, there has been little research undertaken into the breadth of delivery and significance of broadcast coverage. The aim of this paper was to identify the professional sport broadcasting landscape in Australia. The sport broadcast landscape was examined from the perspective of two professional football codes. In-depth interviewing of senior managers of 11 AFL, and 10 NRL clubs was undertaken with the resulting data analysed, coded and emergent themes identified. Three core themes emerged: identified as territory, distribution and profile. A further seven sub-themes specific to the outcomes associated within each category were also identified. Major findings highlight the territorial nature of the Australian professional football league market, identifying the way in which clubs are representative of particular regions. Issues associated with free-to-air delivery, brand recognition and core market attributes were also identified. Results are presented; implications for management and opportunities for future research are discussed.

Investigating the distribution of acacia longifolia ssp. sophorae in south-west Victoria using satellite remote sensing and GIS

Mapping and analysis of the distribution of environmental weeds is an important component of strategic weed management. Such information is particularly important in managing 'native invaders', where invasion characteristics must be clearly understood prior to any management action being taken. This paper reports on an investigation of the current distribution of the native invader Acacia longifolia ssp. sophorae (Labill.) Court (coast wattle) in south-west Victoria, using remote sensing and Geographic Information Systems (GIS). Coast wattle was successfully mapped from Landsat ETM imagery using a supervised classification procedure, with 82%, of coast wattle shown on the map accurately depicting coast wattle on the ground. An estimated 11,448 ha were classified as supporting coast wattle, representing 12% of native vegetation in the study area. A more detailed GIS analysis in the Lower Glenelg National Park revealed coast wattle has invaded a limited number of vegetation types, and is more prevalent close to roads and within management zones associated with disturbance. The current regional extent of the species means widespread control is unlikely; hence the immediate focus should be on preventing further spread into areas where it is currently absent. Landsat imagery also proved to be a successful tool for mapping large scale coast wattle distribution, and could be used in long-term monitoring of the species.

Evidence for Megalake Chad, north-central Africa, during the late quaternary from satellite data

The existence of a very large Lake Chad during the late Quaternary, Megalake Chad, has long been questioned. A Megalake Chad would present strong evidence for climatic fluctuations of great magnitude during the Holocene in tropical Africa. In this paper we used satellite data from Landsat and Modis sensors to collect and analyse new information on landforms in a 2 000 000 km2 region of the Lake Chad Basin. We detected 2300 km of remains marking the ancient shoreline of Megalake Chad. The satellite data also indicated many Saharan rivers and relict deltas leading to the long paleoshoreline. Large dunefield flattenings were observed and interpreted as the result of wave-cut erosion by the paleolake. Similarities were noticed between the landforms observed along the paleoshoreline of Megalake Chad and that of the former Aral Sea. This finding has significant consequences for reconstructing paleohydrology and paleoenvironments through the Lake Chad basin, and continental climate change.

The impact of technology on the supply of sport broadcasting

The demand for sport content by broadcasting organizations has undergone a major redefinition in the last 15-20 years. Television has become predominantly a private good, subject to deregulation and technological revolution. The traditional approach to presenting sport content predominantly live and exclusive through one distribution channel has evolved considerably into one represented now by a multi-faceted, multi-organizational approach. This paper will introduce the two markets of sport and broadcasting through the supply network of broadcasting rights and sports programming, and how this network is affected by the emerging broadcasting technology that is appearing in the digital environment. The era of digital broadcasting creates a significant alteration to the supply of broadcasting content developed by professional sport leagues, competitions and events. A number of emerging distribution system components linked to the digital environment can be identified and associated with sport broadcasting, all of which are having a profound impact on the way sport is being presented now and into the future. The various distribution components are introduced and examined in terms of their impact on the professional sport broadcasting markets. Each distribution component is addressed from the perspective of the regulatory, marketing, and economic impacts on channel management that apply.