4,095 research outputs found
SSGN
As budget challenges put increasing pressure on the operational forces, the ability to deter both potential adversary nations and terrorists will require the warfighting platforms of the United States to be ready to perform diverse missions in parallel. Transformation of operational and tactical precepts will be required to support these increasing demands. The nuclear-powered guided-missile (actually, cruise-missile) submarine, or SSGN, is just such a transformational asset
A treatise on Web 2.0 with a case study from the financial markets
There has been much hype in vocational and academic circles surrounding the emergence of
web 2.0 or social media; however, relatively little work was dedicated to substantiating the
actual concept of web 2.0. Many have dismissed it as not deserving of this new title, since the
term web 2.0 assumes a certain interpretation of web history, including enough progress in
certain direction to trigger a succession [i.e. web 1.0 → web 2.0]. Others provided arguments in
support of this development, and there has been a considerable amount of enthusiasm in the
literature. Much research has been busy evaluating current use of web 2.0, and analysis of the
user generated content, but an objective and thorough assessment of what web 2.0 really stands
for has been to a large extent overlooked. More recently the idea of collective intelligence
facilitated via web 2.0, and its potential applications have raised interest with researchers, yet a
more unified approach and work in the area of collective intelligence is needed.
This thesis identifies and critically evaluates a wider context for the web 2.0 environment, and
what caused it to emerge; providing a rich literature review on the topic, a review of existing
taxonomies, a quantitative and qualitative evaluation of the concept itself, an investigation of
the collective intelligence potential that emerges from application usage. Finally, a framework
for harnessing collective intelligence in a more systematic manner is proposed.
In addition to the presented results, novel methodologies are also introduced throughout this
work. In order to provide interesting insight but also to illustrate analysis, a case study of the
recent financial crisis is considered. Some interesting results relating to the crisis are revealed
within user generated content data, and relevant issues are discussed where appropriate
Power of Web 2.0 mass collaboration in computational intelligence and its’ uses, an example from finance
One of the main issues of concern within
world wide web is the emergence of web
2.0 mass collaboration systems and our
understanding of this new phenomenon.
Web 2.0 systems have gained enormous
popularity in recent years, however as is
often case with novel technologies, the
real merits sometime stay somewhat obscured
to many researchers. In this short
paper web 2.0 applications are lightly introduced,
with parallels to computational
intelligence being drawn and some experimental
results from the financial markets
presented, to illustrate value of web 2.0.
This paper highlights a number of important
issues that deserve academic attention.
We hope this paper will serve as a
light and not too technical introduction
towards encouraging others in computational
intelligence to consider leveraging
web 2.0
Surges and Si IV bursts in the solar atmosphere. Understanding IRIS and SST observations through RMHD experiments
Surges often appear as a result of the emergence of magnetized plasma from
the solar interior. Traditionally, they are observed in chromospheric lines
such as H 6563 \AA and Ca II 8542 \AA. However, whether there is a
response to the surge appearance and evolution in the Si IV lines or, in fact,
in many other transition region lines has not been studied. In this paper we
analyze a simultaneous episode of an H surge and a Si IV burst that
occurred on 2016 September 03 in active region AR12585. To that end, we use
coordinated observations from the Interface Region Imaging Spectrograph (IRIS)
and the Swedish 1-m Solar Telescope (SST). For the first time, we report
emission of Si IV within the surge, finding profiles that are brighter and
broader than the average. Furthermore, the brightest Si IV patches within the
domain of the surge are located mainly near its footpoints. To understand the
relation between the surges and the emission in transition region lines like Si
IV, we have carried out 2.5D radiative MHD (RMHD) experiments of magnetic flux
emergence episodes using the Bifrost code and including the non-equilibrium
ionization of silicon. Through spectral synthesis we explain several features
of the observations. We show that the presence of Si IV emission patches within
the surge, their location near the surge footpoints and various observed
spectral features are a natural consequence of the emergence of magnetized
plasma from the interior to the atmosphere and the ensuing reconnection
processes.Comment: 13 pages, 8 figures. The Astrophysical Journal (Accepted
Media sharing websites and the US financial markets
Recently, one of the main issues of concern within the world wide web is the understanding of web 2.0 mass
collaboration systems. These systems have emerged in recent years and gained enormous popularity. It must, however, be
pointed out, that the potential and practical application of web 2.0 are still not well understood and deserve academic
attention. In this paper we investigate the online media sharing collaborative community and its applications for uses in
stock market analysis and prediction. Specifically, we look at Youtube.com, one of the most popular social media sharing
websites. The association with stock market behaviour and usage patterns are investigated. This work became of more
interest and significance with the recent credit crunch crisis. The data under investigation is novel, and to our knowledge,
this paper reports the first investigation of its kind to the use of collaborative media sharing website for stock market
analysis. We find significant association between video meta-data and textual data using a content driven sentiment text
mining approach. The results are very encouraging and importantly highlight efficient information transfer to online
media sharing communities as there seems to be predictive value in youtube data
Beta-blocker therapy is not associated with mortality after intracerebral hemorrhage
BackgroundBeta-blocker therapy has been suggested to have neuroprotective properties in the setting of acute stroke; however, the evidence is weak and contradictory. We aimed to examine the effects of pre-admission therapy with beta-blockers (BB) on the mortality following spontaneous intracerebral hemorrhage (ICH). MethodsRetrospective analysis of the Helsinki ICH Study database. ResultsA total of 1013 patients with ICH were included in the analysis. Patients taking BB were significantly older, had a higher premorbid mRS score, had more DNR orders, and more comorbidities as atrial fibrillation, hypertension, diabetes mellitus, ischemic heart disease, and heart failure. After adjustment for age, pre-existing comorbidities, and prior use of antithrombotic and antihypertensive medications, no differences in in-hospital mortality (OR 1.1, 95% CI 0.8-1.7), 12-month mortality (OR 1.3, 95% CI 0.9-1.9), and 3-month mortality (OR 1.2, 95% CI 0.8-1.7) emerged. ConclusionPre-admission use of BB was not associated with mortality after ICH.Peer reviewe
Linear response within the projection-based renormalization method: Many-body corrections beyond the random phase approximation
The explicit evaluation of linear response coefficients for interacting
many-particle systems still poses a considerable challenge to theoreticians. In
this work we use a novel many-particle renormalization technique, the so-called
projector-based renormalization method, to show how such coefficients can
systematically be evaluated. To demonstrate the prospects and power of our
approach we consider the dynamical wave-vector dependent spin susceptibility of
the two-dimensional Hubbard model and also determine the subsequent magnetic
phase diagram close to half-filling. We show that the superior treatment of
(Coulomb) correlation and fluctuation effects within the projector-based
renormalization method significantly improves the standard random phase
approximation results.Comment: 17 pages, 7 figures, revised versio
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