268,632 research outputs found
Tag-Cloud Drawing: Algorithms for Cloud Visualization
Tag clouds provide an aggregate of tag-usage statistics. They are typically
sent as in-line HTML to browsers. However, display mechanisms suited for
ordinary text are not ideal for tags, because font sizes may vary widely on a
line. As well, the typical layout does not account for relationships that may
be known between tags. This paper presents models and algorithms to improve the
display of tag clouds that consist of in-line HTML, as well as algorithms that
use nested tables to achieve a more general 2-dimensional layout in which tag
relationships are considered. The first algorithms leverage prior work in
typesetting and rectangle packing, whereas the second group of algorithms
leverage prior work in Electronic Design Automation. Experiments show our
algorithms can be efficiently implemented and perform well.Comment: To appear in proceedings of Tagging and Metadata for Social
Information Organization (WWW 2007
Recommending Items in Social Tagging Systems Using Tag and Time Information
In this work we present a novel item recommendation approach that aims at
improving Collaborative Filtering (CF) in social tagging systems using the
information about tags and time. Our algorithm follows a two-step approach,
where in the first step a potentially interesting candidate item-set is found
using user-based CF and in the second step this candidate item-set is ranked
using item-based CF. Within this ranking step we integrate the information of
tag usage and time using the Base-Level Learning (BLL) equation coming from
human memory theory that is used to determine the reuse-probability of words
and tags using a power-law forgetting function.
As the results of our extensive evaluation conducted on data-sets gathered
from three social tagging systems (BibSonomy, CiteULike and MovieLens) show,
the usage of tag-based and time information via the BLL equation also helps to
improve the ranking and recommendation process of items and thus, can be used
to realize an effective item recommender that outperforms two alternative
algorithms which also exploit time and tag-based information.Comment: 6 pages, 2 tables, 9 figure
Central area fisheries annual report 1994
The purpose of this report is to record key events/data and to outline the activities of the NRA Central Area Fisheries Function during 1994. The Rivers looked at include the Ribble, Lune, Hodder and Wyre. The issues that the report looks at includes Hydrological and meterological data, catch data for salmon and sea trout, fish kills, and fish stocking. It also lists the Micro-tag returns for 1994 and the six key objectives that the Central Area Fisheries Function has set itself for 1995. The report uses a range of different graphs and tables to display their data
Precision Predictions for (Un)Stable WW/4f Production in e +e- Annihilation: YFSWW3/KoralW-1.42/YFSZZ
We present precision calculations of the processes e+ e- -> 4-fermions in
which the double resonant W+ W- and ZZ intermediate states occur. Referring to
these latter intermediate states as the 'signal processes', we show that, by
using the YFS Monte Carlo event generators YFSWW3-1.14 and KoralW-1.42 in an
appropriate combination, we achieve a physical precision on the WW signal
process, as isolated with LEP2 MC Workshop cuts, below 0.5 per cent. We stress
the full gauge invariance of our calculations and we compare our results with
those of other authors where appropriate. In particular, sample Monte Carlo
data are explicitly illustrated and compared with the results of the program
RacoonWW of Denner et al. In this way, we cross check that the total (physical
oplus technical) precision tag for the WW signal process cross section is 0.4
per cent for 200 GeV, for example. Results are also given for 500 GeV with an
eye toward the LC. For the analogous ZZ case, we cross check that our YFSZZ
calculation yields a total precision tag of 2 per cent, when it is compared to
the results of ZZTO and GENTLE of Passarino and Bardin et al., respectively.Comment: 14 pages, 1 figure, 4 tables, presented at RADCOR2000 by B.F.L. War
Two-loop contribution to the pion transition form factor vs. experimental data
We present predictions for the pion-photon transition form factor, derived
with the help of light-cone sum rules and including the main part of the NNLO
radiative corrections. We show that, when the Bakulev-Mikhailov-Stefanis (BMS)
pion distribution amplitude is used, the obtained predictions agree well with
the CELLO and the CLEO data. We found that no model distribution amplitude can
reproduce the observed growth of the new BaBar data, though the BMS model
complies with several BaBar data points.Comment: 5 pages, 2 figures, 3 tables. Presented by the first author at 3rd
joint International HADRON STRUCTURE'09 Conference at Tatranska Strba,
Slovakia, August 30th - September 3rd, 2009. v2 Eqs. (9), (10) corrected;
wrong reference tag removed. v3 Fig. 2 and Ref. [13] correcte
Pion transition form factor at the two-loop level vis-\`a-vis experimental data
We use light-cone QCD sum rules to calculate the pion-photon transition form
factor, taking into account radiative corrections up to the
next-to-next-to-leading order of perturbation theory. We compare the obtained
predictions with all available experimental data from the CELLO, CLEO, and the
BaBar Collaborations. We point out that the BaBar data are incompatible with
the convolution scheme of QCD, on which our predictions are based, and can
possibly be explained only with a violation of the factorization theorem. We
pull together recent theoretical results and comment on their significance.Comment: 10 pages, 4 figures, 3 tables. Presented by the first author at
Workshop "Recent Advances in Perturbative QCD and Hadronic Physics", 20--25
July 2009, ECT*, Trento (Italy), in Honor of Prof. Anatoly Efremov's 75th
Birthday. v2 wrong reference tag removed. v3 Fig. 4 and Ref. [27] correcte
Study of pair production in single-tag two-photon collisions
We report a measurement of the differential cross section of pair
production in single-tag two-photon collisions, , in scattering. The cross section is measured for up to
30 GeV, where is the negative of the invariant mass squared of the
tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and < 1.0 for the total energy and pion scattering angle, respectively,
in the center-of-mass system. The results are based on a data
sample of 759 fb collected with the Belle detector at the KEKB
asymmetric-energy collider. The transition form factor of the
and that of the with the helicity-0, -1, and -2
components separately are measured for the first time and are compared with
theoretical calculations.Comment: 36 pages, 37 figures, 11 tables, Belle Preprint 2015-15, KEK Preprint
2015-2
Overview of the Path to 0.01 Theoretical Luminosity Precision for the FCCee and Its Possible Synergistic Effects for Other FCC Precision Theory Requirements
To exploit properly the precision physics program at the FCC-ee, the
theoretical precision tag on the respective luminosity will need to be improved
from the 0.054 (0.061) results at LEP to 0.01, where the former
(latter) LEP result has (does not have) the pairs correction. We present an
overview of the roads one may take to reach the required 0.01 precision tag
at the FCC-ee and we discuss possible synergistic effects of the walk along
these roads for other FCC precision theory requirements.Comment: 6 pages, 3 tables, presented by B.F.L. Ward at ICHEP2020, Prague, CZ,
July 29, 2020. arXiv admin note: substantial text overlap with
arXiv:1902.0591
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