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Institution

National Research University – Higher School of Economics

EducationMoscow, Russia
About: National Research University – Higher School of Economics is a education organization based out in Moscow, Russia. It is known for research contribution in the topics: Population & Politics. The organization has 12873 authors who have published 23376 publications receiving 256396 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the changes of the Land Cover (LC) and Surface Urban Heat Island (SUHI) in Yerevan and analyzed relations between them, study the relationships between land surface temperature (LST) and environmental factors/parameters, explore the accuracy of satellite derived LST.

52 citations

Proceedings Article
01 Jan 2020
TL;DR: The first non-trivial high-probability complexity bounds for SGD with clipping without light-tails assumption on the noise are derived and derive for this method closing the gap in the theory of stochastic optimization with heavy-tailed noise.
Abstract: In this paper, we propose a new accelerated stochastic first-order method called clipped-SSTM for smooth convex stochastic optimization with heavy-tailed distributed noise in stochastic gradients and derive the first high-probability complexity bounds for this method closing the gap in the theory of stochastic optimization with heavy-tailed noise. Our method is based on a special variant of accelerated Stochastic Gradient Descent (SGD) and clipping of stochastic gradients. We extend our method to the strongly convex case and prove new complexity bounds that outperform state-of-the-art results in this case. Finally, we extend our proof technique and derive the first non-trivial high-probability complexity bounds for SGD with clipping without light-tails assumption on the noise.

52 citations

Book ChapterDOI
15 Dec 2009
TL;DR: General definition of pattern structures and learning by means of them is given and applications of these pattern structures in bioinformatics are discussed.
Abstract: For data given by binary object-attribute datatables Formal Concept Analysis (FCA) provides with a means for both convenient computing hierarchies of object classes and dependencies between sets of attributes used for describing objects. In case of data more complex than binary to apply FCA techniques, one needs scaling (binarizing) data. Pattern structures propose a direct way of processing complex data such as strings, graphs, numerical intervals and other. As compared to scaling (binarization), this way is more efficient from the computational point of view and proposes much better vizualization of results. General definition of pattern structures and learning by means of them is given. Two particular cases, namely that of graph pattern structures and interval pattern structures are considered. Applications of these pattern structures in bioinformatics are discussed.

52 citations

Journal ArticleDOI
TL;DR: The authors discusses several reliability measures: Scott's pi, Krippendorff's alpha, free marginal adjustment, Cohen's kappa, and Perreault and Leigh's $$I$$¯¯ and the assumptions on which they are based and shows that the choice of the reliability measure depends on the format of the text and the type of reading (comprehension versus interpretation).
Abstract: The paper discusses several reliability measures: Scott’s pi, Krippendorff’s alpha, free marginal adjustment (Bennett, Alpert and Goldstein’s $$S$$ ), Cohen’s kappa, and Perreault and Leigh’s $$I$$ and the assumptions on which they are based. It is suggested that correlation coefficients between, on one hand, the distribution of qualitative codes and, on the other hand, word co-occurrences and the distribution of the categories identified with the help of the dictionary based on substitution complement the other reliability measures. The paper shows that the choice of the reliability measure depends on the format of the text (stylistic versus rhetorical) and the type of reading (comprehension versus interpretation). Namely, Cohen’s kappa and Bennett, Alpert and Goldstein’s $$S$$ emerge as reliability measures particularly suited for perspectival reading of rhetorical texts. Outcomes of the content analysis of 57 texts performed by four coders with the help of computer program QDA Miner inform the analysis.

52 citations

Journal ArticleDOI
Roel Aaij, C. Abellán Beteta1, Thomas Ackernley2, Bernardo Adeva3  +990 moreInstitutions (78)
TL;DR: In this article, the decay of B$+$→ ψ$(2}$(3823)K$+}$ is observed for the first time with a significance of 5.1 standard deviations.
Abstract: The decays B$^{+}$→ J/ψπ$^{+}$π$^{−}$K$^{+}$ are studied using a data set corresponding to an integrated luminosity of 9 fb$^{−1}$ collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ$_{2}$(3823), χ$_{c1}$(3872) and ψ(2S) states are reported. The values are$ {\displaystyle \begin{array}{c}\frac{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\uppsi}_2(3823){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi_2(3823)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\upchi}_{\mathrm{c}1}(3872){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\upchi_{\mathrm{c}1}(3872)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(3.56\pm 0.67\pm 0.11\right)\times {10}^{-2},\\ {}\frac{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\uppsi}_2(3823){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi_2(3823)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to \uppsi \left(2\mathrm{S}\right){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi \left(2\mathrm{S}\right)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(1.31\pm 0.25\pm 0.04\right)\times {10}^{-3},\\ {}\frac{{\mathcal{B}}_{\mathrm{B}+\to {\upchi}_{\mathrm{c}1}(3872){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\upchi_{\mathrm{c}1}(3872)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}{{\mathcal{B}}_{{\mathrm{B}}^{+}\to \uppsi \left(2\mathrm{S}\right){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi \left(2\mathrm{S}\right)\to \mathrm{J}/{\uppsi \uppi}^{+}{\uppi}^{-}}}=\left(3.69\pm 0.07\pm 0.06\right)\times {10}^{-2},\end{array}} $where the first uncertainty is statistical and the second is systematic. The decay of B$^{+}$→ ψ$_{2}$(3823)K$^{+}$ with ψ$_{2}$(3823) → J/ψπ$^{+}$π$^{−}$ is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ$_{2}$(3823), χ$_{c1}$(3872) and ψ(2S) states are measured to be$ {\displaystyle \begin{array}{c}{m}_{\upchi_{\mathrm{c}1}(3872)}-{m}_{\uppsi_2(3823)}=47.50\pm 0.53\pm 0.13\;\mathrm{MeV}/{c}^2,\\ {}{m}_{\uppsi_2(3823)}-{m}_{\uppsi_2\left(2\mathrm{S}\right)}=137.98\pm 0.53\pm 0.14\;\mathrm{MeV}/{c}^2,\\ {}{m}_{\upchi_{\mathrm{c}1}(3872)}-{m}_{\uppsi_2\left(2\mathrm{S}\right)}=185.49\pm 0.06\pm 0.03\;\mathrm{MeV}/{c}^2,\end{array}} $resulting in the most precise determination of the χ$_{c1}$(3872) mass. The width of the ψ$_{2}$(3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χ$_{c1}$(3872) state is measured to be$ {\Gamma}_{\upchi_{\mathrm{c}1}(3872)}^{\mathrm{BW}}={0.96}_{-0.18}^{+0.19}\pm 0.21\;\mathrm{MeV} $which is inconsistent with zero by 5.5 standard deviations.[graphic not available: see fulltext]

52 citations


Authors

Showing all 13307 results

NameH-indexPapersCitations
Rasmus Nielsen13555684898
Matthew Jones125116196909
Fedor Ratnikov123110467091
Kenneth J. Arrow113411111221
Wil M. P. van der Aalst10872542429
Peter Schmidt10563861822
Roel Aaij98107144234
John W. Berry9735152470
Federico Alessio96105442300
Denis Derkach96118445772
Marco Adinolfi9583140777
Michael Alexander9588138749
Alexey Boldyrev9443932000
Shalom H. Schwartz9422067609
Richard Blundell9348761730
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023129
2022584
20212,477
20203,025
20192,589
20182,259