27,346 research outputs found
Fast parallel volume visualization on cuda technology
In the medical diagnosis and treatment planning, radiologists and surgeons rely
heavily on the slices produced by medical imaging scanners. Unfortunately, most of
these scanners can only produce two dimensional images because the machines that
can produce three dimensional are very expensive. The two dimensional images from
these devices are difficult to interpret because they only show cross-sectional views
of the human structure. Consequently, such circumstances require highly qualified
doctors to use their expertise in the interpretation of the possible location, size or
shape of the abnormalities especially for large datasets of enormous amount of slices.
Previously, the concept of reconstructing two dimensional images to three
dimensional was introduced. However, such reconstruction model requires high
performance computation, may either be time-consuming or costly. Furthermore,
detecting the internal features of human anatomical structure, such as the imaging of
the blood vessels, is still an open topic in the computer-aided diagnosis of disorders
and pathologies. This study proposed, designed and implemented a visualization
framework named SurLens with high performance computing using Compute
Unified Device Architecture (CUDA), augmenting the widely proven ray casting
technique in terms of superior qualities of images but with slow speed. Considering
the rapid development of technology in the medical community, our framework is
implemented on Microsoft .NET environment for easy interoperability with other
emerging revolutionary tools. The Visualization System was evaluated with brain
datasets from the department of Surgery, University of North Carolina, United
States, containing 109 datasets of MRA, T1-FLASH, T2-Weighted, DTI and
T1-MPRAGE. Significantly, at a reasonably cheaper cost, SurLens Visualization
System achieves immediate reconstruction and obvious mappings of the internal
features of the human brain, reliable enough for instantaneously locate possible
blockages in the brain blood vessels without any prior segmentation of the datasets
Towards Developing an Online Social Media-based Mobile Learning System
The advancement of Information and Communication Technology (ICT) and the Internet revolution gave rise to the several learning
technologies on the web and mobile platform. During the last decade, the social media network became available for users to socialise
and collaborate among peer group. Hence, The integration of e-learning and social media using mobile device as access point is to allow
for learning and collaboration anytime, anywhere. This study seeks to provide learning on the social network platform for users to view
the application on a mobile device and also foster collaboration among scholars. The system was developed using an open source Content
Management System (CMS) Wordpress and Buddypress running on a WAMP or XAMPP server. MySQL was used as database. The
usability of the System on the different mobile devices used was evaluated by identifying the usability attributes; designing a
questionnaire based on those attributes and then analyzing the results with Statistical Package for Social Science (SPSS). The results
showed that the learning system had a good usability score on mobile device
Semi-automated creation of converged iTV services: From macromedia director simulations to services ready for broadcast
While sound and video may capture viewers’ attention, interaction can captivate them. This has not been available prior to the advent of Digital Television. In fact, what lies at the heart of the Digital Television revolution
is this new type of interactive content, offered
in the form of interactive Television (iTV) services. On top of that, the new world of converged networks has created a demand for a new type of converged services on a range of mobile terminals (Tablet PCs, PDAs and mobile phones). This paper aims at presenting a new approach to service creation that allows for the semi-automatic translation of simulations and rapid prototypes created in the accessible desktop
multimedia authoring package Macromedia Director
into services ready for broadcast. This is achieved by a series of tools that de-skill and speed-up the process of creating digital TV user interfaces (UI) and applications for mobile terminals.
The benefits of rapid prototyping are essential for the production of these new types of services, and are therefore discussed in the first section of this paper.
In the following sections, an overview of the
operation of content, service, creation and management sub-systems is presented, which illustrates why these tools compose an important and integral part of a system responsible of creating, delivering and managing converged broadcast and telecommunications services.
The next section examines a number of metadata
languages candidates for describing the iTV services user interface and the schema language adopted in this project. A detailed description of the operation of the two tools is provided to offer an insight of how they can be used to de-skill and speed-up the process of creating digital TV user interfaces and applications for mobile terminals. Finally, representative broadcast oriented and telecommunication oriented converged service components are also introduced, demonstrating how these tools have been used to generate different types of services
Service Platform for Converged Interactive Broadband Broadcast and Cellular Wireless
A converged broadcast and telecommunication
service platform is presented that is able to create, deliver, and
manage interactive, multimedia content and services for consumption
on three different terminal types. The motivations of
service providers for designing converged interactive multimedia
services, which are crafted for their individual requirements, are
investigated. The overall design of the system is presented with
particular emphasis placed on the operational features of each
of the sub-systems, the flows of media and metadata through the
sub-systems and the formats and protocols required for inter-communication
between them. The key features of tools required for
creating converged interactive multimedia content for a range of
different end-user terminal types are examined. Finally possible
enhancements to this system are discussed. This study is of particular
interest to those organizations currently conducting trials
and commercial launches of DVB-H services because it provides
them with an insight of the various additional functions required
in the service provisioning platforms to provide fully interactive
services to a range of different mobile terminal types
Beyond “appropriate” technology. Mobilizing education for development
Having established that technology mediated instruction of some kind\ud
has potential and a valuable role to play in education for on the move and remote\ud
area learners the paper looks at practice as documented and suggests that social\ud
and cultural barriers are a greater challenge than technological ones. It concludes\ud
by suggesting that successful implementation may depend both on use of familiar\ud
technology i.e. phones rather than internet, and establishing for users a social and\ud
cultural validity for using that technology for the delivery of education
Mobile Phone:The Past,The Present and The Future
Since the introduction of cellular analogue phone in 1985 (first generation mobile phone),
there has been a continuous improvement from the first generation to digital secondgeneration
to 2.5 generation and now the third-generation. The ground is also being
prepared for the fourth-generation mobile phone. Mobile technology has transformed our
lives in ways that might have seemed unimaginable some years ago and yet we are still
witnessing more transformations and many more are yet to come. This paper examines the
concept of cellular communication, the development of mobile phones, the features in the
past, the current trends and what to the future holds in general and specifically for Nigeria.
The cost implications of the various generations over the previous ones to the end users are
also discusse
The Dark Side(-Channel) of Mobile Devices: A Survey on Network Traffic Analysis
In recent years, mobile devices (e.g., smartphones and tablets) have met an
increasing commercial success and have become a fundamental element of the
everyday life for billions of people all around the world. Mobile devices are
used not only for traditional communication activities (e.g., voice calls and
messages) but also for more advanced tasks made possible by an enormous amount
of multi-purpose applications (e.g., finance, gaming, and shopping). As a
result, those devices generate a significant network traffic (a consistent part
of the overall Internet traffic). For this reason, the research community has
been investigating security and privacy issues that are related to the network
traffic generated by mobile devices, which could be analyzed to obtain
information useful for a variety of goals (ranging from device security and
network optimization, to fine-grained user profiling).
In this paper, we review the works that contributed to the state of the art
of network traffic analysis targeting mobile devices. In particular, we present
a systematic classification of the works in the literature according to three
criteria: (i) the goal of the analysis; (ii) the point where the network
traffic is captured; and (iii) the targeted mobile platforms. In this survey,
we consider points of capturing such as Wi-Fi Access Points, software
simulation, and inside real mobile devices or emulators. For the surveyed
works, we review and compare analysis techniques, validation methods, and
achieved results. We also discuss possible countermeasures, challenges and
possible directions for future research on mobile traffic analysis and other
emerging domains (e.g., Internet of Things). We believe our survey will be a
reference work for researchers and practitioners in this research field.Comment: 55 page
M-health review: joining up healthcare in a wireless world
In recent years, there has been a huge increase in the use of information and communication technologies (ICT) to deliver health and social care. This trend is bound to continue as providers (whether public or private) strive to deliver better care to more people under conditions of severe budgetary constraint
How Push-To-Talk Makes Talk Less Pushy
This paper presents an exploratory study of college-age students using
two-way, push-to-talk cellular radios. We describe the observed and reported
use of cellular radio by the participants. We discuss how the half-duplex,
lightweight cellular radio communication was associated with reduced
interactional commitment, which meant the cellular radios could be used for a
wide range of conversation styles. One such style, intermittent conversation,
is characterized by response delays. Intermittent conversation is surprising in
an audio medium, since it is typically associated with textual media such as
instant messaging. We present design implications of our findings.Comment: 10 page
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