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Of all publications in the section: 3 725
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Working paper
Gutkin B., Keramati M. the preprint server for biology. код не известен, зарубежная публикация. Cold Spring Harbor Laboratory, 2014
Efficient regulation of internal homeostasis and defending it against perturbations requires complex behavioral strategies. However, the computational principles mediating brain’s homeostatic regulation of reward and associative learning remain undefined. Here we use a definition of primary rewards, as outcomes fulfilling physiological needs, to build a normative theory showing how learning motivated behavior is modulated by the internal state of the animal. The theory proves that seeking rewards is equivalent to the fundamental objective of physiological stability, defining the notion of physiological rationality of behavior. We further give a formal basis for temporal discounting of reward. It also explains how animals learn to act predictively to preclude prospective homeostatic challenges, and attributes a normative computational role to the modulation of midbrain dopaminergic activity by hypothalamic signals.  
Added: Jan 29, 2016
Working paper
Amerik E., Verbitsky M. math. arxive. Cornell University, 2016
Let M be a hyperk\"ahler manifold with b2(M)≥5. We improve our earlier results on the Morrison-Kawamata cone conjecture by showing that the Beauville-Bogomolov square of the primitive MBM classes (i.e. the classes whose orthogonal hyperplanes bound the K\"ahler cone in the positive cone, or, in other words, the classes of negative extremal rational curves on deformations of M) is bounded in absolute value by a number depending only on the deformation class of M. The proof uses ergodic theory on homogeneous spaces.
Added: Sep 7, 2016
Working paper
Rochlitz M. Political Science. PS. Высшая школа экономики, 2016. No. WP BRP 32/PS/2016.
What role can collective action by foreign investors play in an environment characterized by incomplete institutions? We study this question by looking on foreign business associations in the Russian Federation. By interviewing 17 foreign business associations and conducting an online survey of their member firms, we find that business associations play an important welfare-enhancing role in providing a series of support and informational services. However, they do not play a significant role in lobbying the collective interests of their member firms, especially in the current political context in Russia where since the start of the Ukraine crisis the business community seems to have suffered a general loss of influence on political decision making
Added: Feb 2, 2016
Working paper
Belmonte A., Rochlitz M. Political Science. PS. Высшая школа экономики, 2017. No. WP BRP 43/PS/2017 .
To what extent does the degree of authoritarian political support depend on collective memories of a past experience with democracy? And how costly is it for a dictator to manipulate such memories with the help of propaganda? In this paper, we develop a political economy model with endogenous reference points, where a dictator strategically recalls traumatic collective memories of past political instability with the help of propaganda, to convince the population that an autocratic status quo is superior to a potential democratic alternative. In our model, both the optimal level of propaganda and collective memories are jointly determined. We show how the marginal benefit of propaganda is positively correlated both with the amount of rent distribution within the elite, and the intensity of a past traumatic experience with democracy. We illustrate our theoretical findings with case-studies of two authoritarian regimes that were preceded by periods of political instability -- the Russian Federation under Vladimir Putin, and Chile under Augusto Pinochet. We then also provide cross-country empirical evidence in support of our argument.
Added: Feb 16, 2017
Working paper
Péter Biró, Kiselgof S. G. Discussion Papers of Hungarian Academy of Sciences. MT-DP. Institute of Economics, Research Centre for Economic and Regional Studies, Hungarian Academy of Sciences, 2013. No. 6.
A common feature of the Hungarian, Irish, Spanish and Turkish higher education admission systems is that the students apply for programmes and they are ranked according  to their scores. Students who apply for a programme with the same score are in a tie. Ties  are broken by lottery in Ireland, by objective factors in Turkey (such as date of birth) and  other precisely defined rules in Spain. In Hungary, however, an equal treatment policy is  used, students applying for a programme with the same score are all accepted or rejected  together. In such a situation there is only one question to decide, whether or not to admit  the last group of applicants with the same score who are at the boundary of the quota. Both  concepts can be described in terms of stable score-limits. The strict rejection of the last  group with whom a quota would be violated corresponds to the concept of H-stable (i.e.  higher-stable) score-limits that is currently used in Hungary. We call the other solutions  based on the less strict admission policy as L-stable (i.e. lower-stable) score-limits. We show  that the natural extensions of the Gale-Shapley algorithms produce stable score-limits,  moreover, the applicant-oriented versions result in the lowest score-limits (thus optimal for  students) and the college-oriented versions result in the highest score-limits with regard to  each concept. When comparing the applicant-optimal H-stable and L-stable score-limits we prove that the former limits are always higher for every college. Furthermore, these two  solutions provide upper and lower bounds for any solution arising from a tie-breaking  strategy. Finally we show that both the H-stable and the L-stable applicant-proposing scorelimit algorithms are manipulable.
Added: Mar 11, 2013
Working paper
Fedor Bogomolov, Rovinsky M. arxiv.org. math. Cornell University, 2012
Let $\Psi$ be the projectivization (i.e., the set of one-dimensional vector subspaces) of a vector space of dimension $\ge 3$ over a field. Let $H$ be a closed (in the pointwise convergence topology) subgroup of the permutation group $\mathfrak{S}_{\Psi}$ of the set $\Psi$. Suppose that $H$ contains the projective group and an arbitrary self-bijection of $\Psi$ transforming a triple of collinear points to a non-collinear triple. It is well-known from \cite{KantorMcDonough} that if $\Psi$ is finite then $H$ contains the alternating subgroup $\mathfrak{A}_{\Psi}$ of $\mathfrak{S}_{\Psi}$. We show in Theorem \ref{density} below that $H=\mathfrak{S}_{\Psi}$, if $\Psi$ is infinite.
Added: Nov 21, 2014
Working paper
Belianin A. V., Kosals L. Исследования по экономике и финансам. WP9. Высшая школа экономики, 2015. No. WP9/2015/03.
Corruption, i.e. regular abuse of public office for private gains, draws substantial attention of researchers in many disciplines. Our paper adds to the experimental literature on corruption a novel experiment on corruption-at-the-top among the real Russian police officers of senior middle rank as experimental subjects (apparently the first study of that kind), which is contrasted to that of ordinary citizens (students in economics). Our experimental design explicitly takes account of the peculiarities of the Russian case during police reform, as well as social and institutional constraints facing anticorruption policies. We find that taking bribes, and especially defending against possible checks of corruption, is quite common to Russian police officers, yet even more typical is their readiness to contribute towards the decrease of the likelihood of this anti-corruption check, even if this contribution leads to private losses. Another typical feature is increased volatility of the frequency and scale of bribery among the police officers (as contrasted to ordinary citizens) when measures aimed at fighting corruption are introduced. We discuss robustness of these findings, as well as their implications for anti-corruption policy.
Added: Jun 7, 2015
Working paper
Belianin A. V., Kosals L. Исследования по экономике и финансам. WP9. Высшая школа экономики, 2015
Corruption, i.e. regular abuse of public office for private gains, draws substantial attention of researchers in many disciplines. Our paper adds to the experimental literature on corruption a novel experiment on corruption-at-the-top among the real Russian police officers of senior middle rank as experimental subjects (apparently the first study of that kind), which is contrasted to that of ordinary citizens (students in economics). Our experimental design explicitly takes account of the peculiarities of the Russian case during police reform, as well as social and institutional constraints facing anticorruption policies. We fi nd that taking bribes, and especially defending against possible checks of corruption, is quite common to Russian police officers, yet even more typical is their readiness to contribute towards the decrease of the likelihood of this anti-corruption check, even if this contribution leads to private losses. Another typical feature is increased volatility of the frequency and scale of bribery among the police offi cers (as contrasted to ordinary citizens) when measures aimed at fighting corruption are introduced. We discuss robustness of these findings, as well as their implications for anti-corruption policy.
Added: Dec 25, 2015
Working paper
Morozov I. A., Podkolzina E. Economics/EC. WP BRP. Высшая школа экономики, 2013. No. 25.
This paper proposes a method of bid-rigging detection, which allows us to reveal cartels in procurement auctions without any prior knowledge of the market structure. We apply it to data on highway construction procurements in one of the Russian regions and show that five suppliers demonstrated passive bidding behavior, which is consistent with the so called ‘rotating bidding’ scheme of collusion. The suggested methodology can be potentially used by both researchers and anti-trust agencies for cartel disclosure in various markets.
Added: Mar 26, 2013
Working paper
Shastitko A., Golovanova S. Economics/EC. WP BRP. Высшая школа экономики, 2014. No. WP BRP 49/EC/2014.
This paper demonstrates that even established and verified facts of agreements among producers are not a sufficient condition for cartel identification and, as a consequence, prosecution of agreement participants. Such requires looking at institutional details and the wider context of these and similar appearances or occurrences of documents and actions when qualifying the actions of market participants and their effects. This paper discusses a recent antitrust case brought against Russian manufacturers of large diameter pipes (LDPs) that examined supposedly abusive practices by these firms that were contrary to the law on the Protection of Competition, which prohibits market division. An analysis of the materials in this case using modern economic theory indicates that the presence of collusion is inconsistent with the active participation of the main consumer of LDPs in that agreement. The chosen format for the cooperation between pipe manufacturing companies and OJSC Gazprom, namely indicative planning, may be explained from the perspective of reducing contract risk in an environment characterized by large-scale private investments.
Added: Feb 12, 2014
Working paper
Dranev Y., Fomkina S. Financial Economics. FE. Высшая школа экономики, 2013. No. WP BRP 26/FE/2013 .
We introduce a new asset pricing model to account for risk asymmetrically in a very natural way. Assuming asymmetric investor behavior we develop a utility function similar to a quadratic utility but include a colog measure for capturing risk attitude. Asymmetry in investor preferences follows the asymmetric relationships between asset and market returns in equilibrium. Moreover the local version of the model depends on the characteristics of domestic markets, which is reflected in the different relationship between asset and market returns. We test the model in the Russian and South African markets and show that market premium in the Russian market is higher than in the South African market. 
Added: Jan 24, 2014
Working paper
Artamkin I. arxiv.org. math. Cornell University, 2010. No. 1005.2958.
Added: Nov 2, 2012
Working paper
Bigeni A. arxiv.org. math. Cornell University, 2017. No. 1712.01929.
Added: Sep 2, 2018
Working paper
Blokh A., Oversteegen L., Ptacek R. et al. arxiv.org. math. Cornell University, 2014
To construct a model for a connectedness locus of polynomials of degree $d\ge 3$ (cf with Thurston's model of the Mandelbrot set), we define \emph{linked} geolaminations $\mathcal{L}_1$ and $\mathcal{L}_2$. An \emph{accordion} is defined as the union of a leaf $\ell$ of $\mathcal{L}_1$ and leaves of $\mathcal{L}_2$ crossing $\ell$. We show that any accordion behaves like a gap of one lamination and prove that the maximal \emph{perfect} (without isolated leaves) sublaminations of $\mathcal{L}_1$ and $\mathcal{L}_2$ coincide. In the cubic case let $\mathcal{D}_3\subset \mathcal{M}_3$ be the set of all \emph{dendritic} (with only repelling cycles) polynomials. Let $\mathcal{MD}_3$ be the space of all \emph{marked} polynomials $(P, c, w)$, where $P\in \mathcal{D}_3$ and $c$, $w$ are critical points of $P$ (perhaps, $c=w$). Let $c^*$ be the \emph{co-critical point} of $c$ (i.e., $P(c^*)=P(c)$ and, if possible, $c^*\ne c$). By Kiwi, to $P\in \mathcal{D}_3$ one associates its lamination $\sim_P$ so that each $x\in J(P)$ corresponds to a convex polygon $G_x$ with vertices in $\mathbb{S}$. We relate to $(P, c, w)\in \mathcal{MD}_3$ its \emph{mixed tag} $\mathrm{Tag}(P, c, w)=G_{c^*}\times G_{P(w)}$ and show that mixed tags of distinct marked polynomials from $\mathcal{MD}_3$ are disjoint or coincide. Let $\mathrm{Tag}(\mathcal{MD}_3)^+ = \bigcup_{\mathcal{D}_3}\mathrm{Tag}(P,c,w)$. The sets $\mathrm{Tag}(P, c, w)$ partition $\mathrm{Tag}(\mathcal{MD}_3)^+$ and generate the corresponding quotient space $\mathrm{MT}_3$ of $\mathrm{Tag}(\mathcal{MD}_3)^+$. We prove that $\mathrm{Tag}:\mathcal{MD}_3\to \mathrm{MT}_3$ is continuous so that $\mathrm{MT}_3$ serves as a model space for $\mathcal{MD}_3$.
Added: Feb 11, 2015
Working paper
Gorinov A. arxiv.org. math. Cornell University, 2009. No. 0901.1340.
As noticed by R. Kulkarni, the conjugacy classes of subgroups of the modular group correspond bijectively to bipartite cuboid graphs. We'll explain how to recover the graph corresponding to a subgroup $G$ of $PSL_2(\mathbb{Z})$ from the combinatorics of the right action of $PSL_2(\mathbb{Z})$ on the right cosets $G\setminus PSL_2(\mathbb{Z})$ This gives a method of constructing nice fundamental domains (which Kulkarni calls "special polygons") for the action of $G$ on the upper half plane. For the classical congruence subgroups $\Gamma(N),\Gamma_0(N),\Gamma_1(N)$ etc. the number of operations the method requires is the index times something that grows not faster than a polynomial in $log(N)$. We also give algorithms to locate a given element of the upper half-plane on the fundamental domain and to write a given element of $G$ as a product of independent generators.
Added: Apr 4, 2014
Working paper
Artamkin I. MPIM. MPIM. Max Planck Institute for Mathematics, 2007. No. 1/2007.
Added: Nov 2, 2012
Working paper
Yanbarisova D. Education. EDU. Высшая школа экономики, 2014
This paper analyses the influence of different combinations of work and study on academic achievement among university students of Yaroslavl region in Russia. The data was collected during the first wave of longitudinal research on the educational and occupational trajectories of graduates of schools and universities conducted by the Institute of Education, Higher School of Economics, Moscow in 2009. The sample consists of 1474 4th and 5th year university students. Five work-study types are defined on the basis of two variables: work schedule and work relatedness to specialty: full-time work outside the specialty field, part-time work outside the specialty field; full-time work in the specialty field, part-time work in the specialty field; and not working during university studies. The results show that working outside the specialty field (full-time or part-time) has a negative impact on academic achievement, whereas the other work-study types do not have any significant effect. The results partly support our hypothesis that different work-study combinations influence academic achievement in different ways and that job relatedness to the academic specialty is a significant characteristic in defining the influence. The paper contributes to the research field of studying attributes of student employment which are responsible for different effects on academic achievement
Added: Dec 9, 2014
Working paper
Koltsova O., Koltsov S., Nikolenko S. I. Sociology. SOC. Высшая школа экономики, 2013. No. WP BRP 33/SOC/2013.
We study the structure of online discussions in order to uncover latent communities of socially important debate. Our research reveals that discussion communities defined by mutual commenting in the Russian language blogosphere are centered mainly around blog authors as opinion leaders and, to a lesser extent, around a shared topic or topics. We have derived these conclusions from the dataset of 17386 full text posts written by top 2000 LiveJournal bloggers and over 520,000 comments that result in about 4.5 million edges in the network of co-commenting  
Added: Jan 14, 2014
Working paper
Семенякин Н. С. arxiv.org. cond-mat. Cornell University, 2016
In recent paper of Falkovich and Levitov it was shown, that geometry of separatrixes for viscous electronic flow in graphene is sensitive to boundary conditions. Here we discover theis relation in details. Also we propose, how boundary conditions could be probed experimentally, using weak magnetic field and observed features of separatrixes.
Added: Apr 4, 2018
Working paper
Korf D. V. Economics. EC. Высшая школа экономики, 2016. No. WP BRP 74/LAW/2017.
Added: Apr 5, 2017
Working paper
Shmatko N. A., Lavrynenko A. S., Meissner D. Science, Technology and Innovation. WP BRP. Высшая школа экономики, 2017. No. 74.
The paper explores the composition of researchers' skillsets in an innovation-driven environment from the perspective of employers. The authors analyze the relation between skills requirements described in job advertisements for researchers and the presumed innovation culture of companies. The study is based on job advertisements content analysis and in-depth interviews with chiefs of research and development companies. It uses biotechnology industry as an example as it is one of the fastest-growing and innovation-driven sectors globally. Authors used data from Russian, as well as Canadian, UK and USA job search engines to consider international context. Empirical findings demonstrated that skills composition stress on hard skills more frequently and detailed, while soft skills are often a "must have without saying". The same is for digital skills that are assumed to be essential in high-tech companies globally and therefore not fully specified in job ads. There is a certain mismatch between skills presented in the ads and articulated in the interviews as employers tend to demonstrate innovation-friendly company culture for possible applicants. The present paper enriches literature on skills assessment, giving comprehensive lists of biotech skills in-demand divided into soft and hard categories. In addition, it provides the new insight into employee skills articulated by the companies as a strong element of organizational innovation climate.
Added: Oct 13, 2017