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Of all publications in the section: 3 534
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Working paper
Cheltsov I., Park J., Won J. arxiv.org. math. Cornell University, 2015
On del Pezzo surfaces, we study effective ample R-divisors such that the complements of their supports are isomorphic to A1-bundles over smooth affine curves.
Added: Nov 18, 2015
Working paper
Cheltsov I. math. arxive. Cornell University, 2016
We answer a question of Ciro Ciliberto about cylinders in rational surfaces which are obtained by blowing up the plane at points in general position.
Added: Dec 3, 2018
Working paper
Ivan Cheltsov, Park J., Won J. arxiv.org. math. Cornell University, 2013
For each del Pezzo surface $S$ with du Val singularities, we determine whether it admits a $(-K_S)$-polar cylinder or not. If it allows one, then we present an effective divisor $D$ that is $\mathbb{Q}$-linearly equivalent to $-K_S$ and such that the open set $S\setminus\mathrm{Supp}(D)$ is a cylinder. As a corollary, we classify all the del Pezzo surfaces with du Val singularities that admit nontrivial $\mathbb{G}_a$-actions on their affine cones.
Added: Dec 27, 2013
Working paper
Яковлев А. А., Фрейнкман Л. М., Золотов А. В. Институциональные проблемы российской экономики. WP1. НИУ ВШЭ, 2015
Added: Jan 22, 2016
Working paper
Dabrowski M. Bruegel blog. no code. Bruegel, 2018
The modernisation of the Ukrainian economy and state continues to develop at an unsatisfactory pace due to a lack of pro-reform political consensus. The two upcoming election campaigns in 2019 (presidential and parliamentary) make the reform process even slower and additionally put its effectiveness and sustainability under risk. The international community has a limited toolkit to overcome this stalemate.
Added: Sep 14, 2018
Working paper
Doz C., Petronevich A. Documents de travail du Centre d'Economie de la Sorbonne. cesdoc:13050. Centre d'Economie de la Sorbonne, 2015
The ocial institutions (NBER, OECD, CEPR and others) provide business cycle chronology with a lag from 3 months up to several years. Markov-Switching Dynamic Factor Model (MS-DFM) allows to produce the turning points more timely. The Kalman lter estimates of the model can be obtained in one step with limited number of series or in two steps on a much richer dataset. While the choice of correct series is a challenge for the one-step method, the problem of the two-step method is the potential misspeci cation. In this paper we apply one-step and two-step approaches to the French data and compare their performance. Both methods give qualitatively similar results and prove to reproduce the OECD business cycle chronology on the 1993-2014 monthly sample well. We nd that the two-step method is more precise in determining the beginnings and the ends of recessions. Also, both methods produce extra signals corresponding to downturns which were too short to belong to OECD chronology of recessions.
Added: Oct 21, 2015
Working paper
Smirnov S. V., Kondrashov N. V., Petronevich A. Economics. EC. Высшая школа экономики, 2016. No. 122.
This paper establishes a reference chronology for the Russian economic cycle from the early 1980s to mid-2015. To detect peaks and troughs, we tested nine monthly indices as reference series, three methods of seasonal adjustments (X-12-ARIMA, TRAMO/SEATS, and CAMPLET), and four methods for dating cyclical turning points (local min/max, Bry-Boschan, Harding-Pagan, and Markov-Switching model). As these more or less formal methods led to different estimates, any sensible choice was possible only on the grounds of informal considerations. The final set of turning points looks plausible and separates expansions and contractions in an explicable manner, but further discussions are needed to establish a consensus between experts.
Added: Jan 22, 2016
Working paper
Aleskerov F. T., Petrushchenko S. Математические методы анализа решений в экономике, бизнесе и политике. WP7. Издательский дом ВШЭ, 2013. No. WP7/2013/02.
Data Envelopment Analysis is a well-known non-parametric technique of efficiency evaluation which is actively used in many economic applications. However, DEA is not very well applicable when a sample consists of firms operating under drastically different conditions. Generally, it is difficult to define to what extent the analyzed sample is heterogeneous. We offer a new method of efficiency estimation based on a sequential exclusion of alternatives and standard DEA approach. This allows to assess efficiency in the case of heterogeneous set of firms. We obtain a connection between efficiency scores obtained via standard DEA model and the ones obtained via our algorithm. We also evaluate 29 Russian universities and compare results obtained by two techniques.
Added: Oct 2, 2013
Working paper
Kashanin A. Law. LAW. Высшая школа экономики, 2014. No. WP BRP 32/LAW/2014.
In codifying intellectual property rights, Russian legislators have left what standards of originality and creativity can be considered criteria of copyrightability a moot point. Nevertheless, it is crucial for answering questions about where the lower boundary of copyrightability lies and, consequently, what intellectual products that have an insignificant creative component, but are of high economic importance – such as databases, computer software, advertisement slogans or design work – should be copyrightable. This article addresses the problem of identifying criteria for copyrightability and non-copyrightability in the Russian legal literature by modeling various types of demarcation criteria and analyzing their strong and weak points. Analyzing debates in the legal literature warrant the conclusion that there is a trend to set looser standards for originality and creativity and grant copyright protection to works of low authorship.
Added: Feb 14, 2014
Working paper
Rezvykh P. V. Humanities. HUM. Basic Research Programme, 2013. No. 24/HUM/2013.
Using a discussion on the significance of Ancient Greek ordinances between F.W.J. Schelling and Count S.S. Uvarov as an example, this article analyses the complex interaction between theological, philosophical, religious, and political factors in the reception of Schelling’s philosophical ideas in Russia in the XIX century.
Added: May 2, 2013
Working paper
Stepanov I. A., Albrecht J. Economics. EC. Высшая школа экономики, 2019. No. 211.
The issue of instrument choice is vital for climate policy. Carbon pricing is used next to a range of traditional energy taxes and renewable energy policies such as feed-in tariffs and minimal renewable generation targets. Several countries introduced carbon taxes alongside existing energy taxes such as excise duties on vehicle fuels. Since 2005, the EU Emissions Trading Scheme (EU ETS) has attached a direct price to the GHG emissions of ETS companies. The combination of multiple instruments and explicit and indirect carbon price signals created a complex and frequently changing institutional landscape that blurs the contribution of each policy instrument. Can the decarbonization of the European economy be attributed to carbon price instruments or to renewable energy policies together with other fiscal instruments? This paper clarifies the relative impact of explicit carbon price instruments (carbon taxes and EU ETS) compared to other instruments, namely renewable energy policies and indirect carbon price signals (general energy taxes). The methodology is based on the calculation of the implicit carbon price in existing fiscal systems. On the basis of panel data for 30 European countries 1995–2016, several fixed-effect regression estimations were performed. The results indicate a greater but decreasing impact of price instruments on carbon intensity compared to renewable energy policies and a greater but decreasing relative impact of indirect price signals compared to explicit ones.
Added: Feb 15, 2019
Working paper
Levina I. A. IOS Working Paper. WP. Leibniz Institute for East and Southeast European Studies, 2018. No. 375.
Can decentralization of firms be successful in an environment with weak institutions? Decentralization can do a great job for improving firms’ efficiency and competitiveness by creating opportunities for quicker and more competent decision-making and enhancing motivation of employees. However, decentralization is associated with a substantial increase in agency risk, which is particularly important for firms that operate under weak institutions. Hence, the popular belief is that in countries with weak institutions, firms are unable to successfully decentralize. In this paper, we study evidence from Russian firms to challenge this belief. Following anecdotal evidence and trends observed in the data, we introduce the notions of real decentralization for firms that decentralize decision-making to competitively hired professionals and cautious decentralizationfor firms that decentralize to people hired through connections. We demonstrate that really decentralized firms are, on average, significantly more likely to invest even in Russian weak institutional conditions. We also show that the gap in investment between really decentralized and other firms declines as corruption grows. Empirical research presented in the paper implies that there still can be significant room for decentralization even in an environment with weak institutions, such as that of Russia. However, as the role of non-market factors (such as corruption) in firms’ prosperity increases, the potential value of decentralization for the firms declines.
Added: Oct 25, 2018
Working paper
Lukyanova A., Vishnevskaya N. IBES DISKUSSIONSBEITRAG. IBES. Universität Duisburg-Essen, 2014. No. 206.
No abstract
Added: Feb 9, 2015
Working paper
Borisova E. I. SSRN Working Paper Series. SSRN Working Paper Series. Social Science Research Network, 2013
Ability to make collective agreements determines life of many organizations. But does it matter for the decision to make a new organization? On the data of 82 homeowners associations (HOAs) in Moscow and Perm factors that underpin HOA formation are studied. A logit-regression analysis is used. Ability of tenants to resolve the collective action problem in operating housing infrastructure shows its importance along with the physical characteristics of an apartment building. Thus HOA formation by homeowners is a signal of their ability to manage a house. Collective action paradox begins to play role not only ex post, but also ex ante, prior to organization’s establishment.
Added: Feb 24, 2014
Working paper
Iserov A. A. Humanities. HUM. Basic Research Programme, 2015. No. WP BRP 115/HUM/2015.
This research is devoted to the comparison of the declarations of independence of the United States and Spanish American nations. For the first time in historiography the exhaustive list of Spanish American declarations of independence is compiled. The questions risen by this attempted comparison lead to a reconsideration of the main problems of the New World independence movements and in the final account, to the discussion of a nature of the British and the Spanish colonial societies in Americas, and thus do not have clear and final answers.
Added: Mar 15, 2016
Working paper
Zaev D. arxiv.org. math. Cornell University, 2015
We consider L^p-Wasserstein distances on a subset of probability measures. If the subset of interest appears to be a simplex, these distances are determined by their values on extreme points of the simplex. We show that this fact is a corollary of the following decomposition result: an optimal transport plan can be represented as a mixture of optimal transport plans between extreme points of the simplex. This fact can be generalized to the Kantorovich problem with additional linear restriction and the associated Wasserstein-like distances. We prove that the decomposition is possible, if marginal measures are elements of a simplex that is compatible with the additional restriction.
Added: May 25, 2015
Working paper
de Vries G. J., Erumban A. A., Timmer M. P. et al. Economics. EC. Высшая школа экономики, 2011. No. 04.
This paper studies structural transformation and its implications for productivity growth in the BRIC countries based on a new database that provides trends in value added and employment at a detailed 35-sector level. We find that for China, India and Russia reallocation of labour across sectors is contributing to aggregate productivity growth, whereas in Brazil it is not. However, this result is overturned when a distinction is made between formal and informal activities. Increasing formalization of the Brazilian economy since 2000 appears to be growth-enhancing, while in India the increase in informality after the reforms is growth-reducing.
Added: Aug 28, 2012
Working paper
de Vries G. J., Erumban A. A., Timmer M. P. et al. GGDC Research Memorandum. GD. University of Groningen, 2011. No. GD-121.
This paper studies structural transformation and its implications for productivity growth in the BRIC countries based on a new database that provides trends in value added and employment at a detailed 35-sector level. We find that for China, India and Russia reallocation of labour across sectors is contributing to aggregate productivity growth, whereas in Brazil it is not. However, this result is overturned when a distinction is made between formal and informal activities. Increasing formalization of the Brazilian economy since 2000 appears to be growth-enhancing, while in India the increase in informality after the reforms is growth-reducing.
Added: Jan 28, 2013
Working paper
Ivanov D. arxiv.org. Computer Science. Cornell University, 2019
Positive-Unlabeled Learning is an analog of supervised binary classification for the case when the Negative (N) sample in the training set is contaminated with latent instances of the Positive (P) class and hence is Unlabeled (U). We develop DEDPUL1 , a method able to solve two problems: first, to estimate the proportions of the mixing components (P and N) in U, and then, to classify U. The main steps are to reduce dimensionality of the data using Non-Traditional Classifier [11], to estimate densities of the reduced data in both P and U samples, and to apply the Bayes rule to density ratio. We experimentally show that DEDPUL outperforms current state-of-the-art methods for both problems. Additionally, we improve current state-of-the-art method for PU Classification [16].
Added: May 31, 2019
Working paper
Krasovskaya S., Zhulikov G., MacInnes W. PSYCHOLOGY. WP BRP. Издательский дом НИУ ВШЭ, 2018. No. 93/PSY/2018..
Approximately twenty years ago, Laurent Itti and Christof Koch created a model of saliency in visual attention in an attempt to recreate the work of biological pyramidal neurons by mimicking neurons with centre-surround receptive fields. The Saliency Model has launched many studies that contributed to the understanding of layers of vision and the sphere of visual attention. The aim of the current study is to improve this model by using an artificial neural network that generates saccades similar to how humans make saccadic eye movements. The proposed model uses a Leaky Integrate-and-Fire layer for temporal predictions, and replaces parallel feature maps with a deep learning neural network in order to create a generative model that is precise for both spatial and temporal predictions. Our deep neural network was able to predict eye movements based on unsupervised learning from raw image input, as well as supervised learning from fixation maps retrieved during an eye-tracking experiment conducted with 35 participants at later stages in order to train a 2D softmax layer. The results imply that it is possible to match the spatial and temporal distributions of the model to spatial and temporal human distributions.
Added: Oct 15, 2018
Working paper
Panarina M. A. Literary Studies. WP BRP. Высшая школа экономики, 2015. No. WP BRP 11/LS/2015 .
Previous research in the stanzaic repertoire of Russian poetry has shown that Russian verse from the 1950s onwards is less standardized with looser patterns, compared to Russian classical verse. This article applies a new approach to statistical description which is more suitable for Russian contemporary verse. It also studies forms with minor deviations and their functions on the margins of regular verse, using statistical data from a full stanzaic description of Joseph Brodsky’s poetic texts. Existing studies of Brodsky’s poetics revealed examples of innovative versification and unique patterns, although his experiments in those areas have not yet been studied with a specific focus on forms with deviations.  The practical implications of this research not only suggest new interpretations of Brodsky’s poetry, but also enrich the traditional view of the stanzaic forms with deviations in meter, rhyme, graphics and syntax. The findings show how such forms reflect Brodsky’s ‘poetics of conflict’ and illustrate major changes in the development of Russian verse since the 1950s
Added: Nov 2, 2015