479,762 research outputs found
Making Kr+1-free graphs r-partite
No full textThe Erdős–Simonovits stability theorem states that for all ε > 0 there exists α > 0 such that if G is a Kr+1-free graph on n vertices with e(G) > ex(n, Kr+1)– α n2, then one can remove εn2 edges from G to obtain an r-partite graph. Füredi gave a short proof that one can choose α = ε. We give a bound for the relationship of α and ε which is asymptotically sharp as ε → 0.This article is published as Balogh J, Clemen FC, Lavrov M, Lidický B, Pfender F. Making Kr+1-free graphs r-partite. Combinatorics, Probability and Computing. 2021;30(4):609-618. doi:10.1017/S0963548320000590
Making Kr+1-Free Graphs r-partite
No full textThe Erdos-Simonovits stability theorem states that for all epsilon > 0 there exists alpha > 0 such that if G is a Kr+1-free graph on n vertices with e(G) > ex(n, Kr+1)-alpha n2, then one can remove epsilon n2 edges from G to obtain an r-partite graph. Furedi gave a short proof that one can choose alpha = epsilon. We give a bound for the relationship of alpha and epsilon which is asymptotically sharp as epsilon right arrow 0.This pre-print is made available through arixiv: https://arxiv.org/abs/1910.00028.</p
Travel photography
No full textThesisJust as trave llers of past centuries recorded their personal impressions in diaries;
the modern day trave ller lIses a camera to record the sight s and events of his
Journeys .
2
T ravel photography IS as old as photography itself, with the invention of
photography, travellers set out with their primative came ras and started
recording the world as neve r be fore .
The aim in this dissertatio n is to e xplore the OrIgInS of travel photography;
discuss ing some of the pioneers of travel photography . To summa ri ze some of
I
the categories of travel photography , and the importance of diversity.
Many problems were encountered and where possible soluti ons offered. The
author will al so discu ss his travels and attempt "to anal yse the images taken
during these travels
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
The creative photographic image
No full textThesisThe author ha.s chosen to explore the po ss ibilit y that the
creative talent exhibited by an artist's perceptive powers can be
equalled
effects.
by the photographer through subtle use of special
To this e nd the author has explo l'ed a pl'obiem encountered
particularly in 1990's photography which has resulted ill a mass
of high quality photographs taken by large numbers of amateurs
world- wide, who are u si ng sophisticated moderrl camet's technology
as a recording tool without achieving that element of creativity
which captul'es DU I' attention and communicates with our inmost
beings.
The authol' ha s used his own photogl'aphic work and t.ha t of
contempor"ary photogr'aphers in his field of s tudy, to su bstantiate
the claim that thl'ough use of subtle special effects in a ,'ariety
of topics, the photograph can be used a s imaginatively and
c reative ly a s an i mage pI'oduced by a competent artist o r' painter.
This observati.on could have important implication s for an
industry which throug}l co mput er' tec}lnology PI'oposes t o go beyond
the technical re strictions o f the painter whil s t main tai ning that
p rofession's cl"eative flexibility. These spec ial effects should, i n the Buttlo r"s opinion be u sed not
as an e nd to th e mselves, bu t as a mea n s o f transfol~ min g the
of ten c linical med ium of pho tography into a creative tool li lni te d
only by th e photographer's imaginative power's
Exploring the influence of neurofeedback training on Grade R learners’ concentration levels for school readiness
No full textThesis (Ph.D.(Psychology of Education))--University of the Free State, 2022The premise of this study is to explore the influence of neurofeedback training on Grade R learners’ concentration levels for school readiness. In order to understand the complexity of this study, it is important to note the past inequalities and the effect of it on children, specifically on their concentration levels within the classroom and the changes it brought to where the education system is today. This background gave way to the purpose of this study to determine the influence of neurofeedback training on Grade R learners’ concentration levels for school readiness, as well as to determine the experience teachers have with learners’ concentration levels in school. Furthermore, I want to establish how teachers perceive neurofeedback and the implementation thereof. This will indicate if it would be possible to implement neurofeedback training into the South African educational system and to determine the support teachers need to do so. A mixed method approach was followed, whereby the research adopts an embedded convergent research design, whereby qualitative and quantitative research data are embedded in a larger design. The sampling utilizes a simple multi-stage purposeful random sample design. The first stage is a random selection and the following stage is purposive selection of participants (Onwuegbuzie & Collins, 2007). The population involved all Primary Schools from the Motheo District, in the Free State Province, South Africa, who were willing to take part in this study. The data gathered from the questionnaires was analysed by a statistician with the program called Python to the point where the data could be represented in graph form. The data from the document analysis was done, were a six (6) page report, received from the qualified occupational therapist. The data from the focus group interview was also interpreted in conjunction with the data found from the document analysis to clarify, support and strengthen the results found. Literature was also collected with regard to theories and aspects of concentration, child development, as well as neurofeedback, and the necessary inferences and conclusions drawn. Findings from the study were significant and positive in terms of the possible implementation of Brain Gain Neurofeedback training into the South African school curriculum as well as the need, almost desperation, that were identified that exist among teachers
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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