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Of all publications in the section: 3 551
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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
Working paper
Gurkov I. B. Management. MAN. Высшая школа экономики, 2015. No. 38.
Purpose – We aim to better understand the factors that shape the intensity and perceived effectiveness of communication between heads of the manufacturing units of multinational corporations (MNCs). Design/methodology/approach – A series of interviews and a medium-size survey among subsidiary executives were conducted. Findings – The intensity of most inter-unit communication channels depends on the speed and magnitude of the changes in products and production technologies that manufacturing subsidiaries experience. For newly established subsidiaries, mastering inter-unit communication channels precedes inter-unit cooperation. At the same time, different types of inter-unit cooperation strengthen specific channels of inter-unit communication. The assessment of the efficiency of a communication channel with high media richness strongly correlates to the intensity of its use. Research limitations/implications – The results are confined to one country where the manufacturing subsidiaries of MNCs were surveyed. Further research is needed for the general applicability of these findings to subsidiaries in several countries or regions. Practical implications – As inter-unit communication precedes inter-unit cooperation for newly established subsidiaries, headquarters and more experienced subsidiaries should promote the use of communication channels with high media richness. Several suggestions on how to perform such a task are proposed. Originality/value – This paper contributes to the ongoing discussion concerning inter-unit communication and knowledge transfer within MNCs.
Added: May 4, 2015
Working paper
Gordin V. A., Tsymbalov E. A. math. arxive. Cornell University, 2017
Added: Dec 15, 2017
Working paper
Gordin V. A., Tsymbalov E. A. math. arxive. Cornell University, 2017
The implicit compact fi nite-diff erence scheme was developed for evolutionary partial di fferential parabolic and Schrodinger-type equations and systems with a weak nonlinearity. To make a temporal step of the compact implicit scheme we need to solve a non-linear system. We use for this step a simple explicit diff erence scheme and then Newton - Raphson iterations, which are implemented by the double-sweep method. Numerical experiments con firm the 4-th order of an algorithm. The Richardson extrapolation improves it up to the 6-th order.     
Added: Dec 15, 2017
Working paper
Déev R. N. math. arxive. Cornell University, 2016
Essential dimension of a family of complex manifolds is the dimension of the image of its base in the Kuranishi space of the fiber. We prove that any family of hyperk\"ahler manifolds over a compact simply connected base has essential dimension not greater than 1. A similar result about families of complex tori is also obtained.
Added: Sep 23, 2016
Working paper
Campana F., Demailly J., Misha Verbitsky. arxiv.org. math. Cornell University, 2013
We prove that any compact K\"ahler 3-dimensional manifold which has no non-trivial complex subvarieties is a torus. This is a very special case of a general conjecture on the structure of 'simple manifolds', central in the bimeromorphic classification of compact K\"ahler manifolds. The proof follows from the Brunella pseudo-effectivity theorem, combined with fundamental results of Siu and of the second author on the Lelong numbers of closed positive (1,1)-currents, and with a version of the hard Lefschetz theorem for pseudo-effective line bundles, due to Takegoshi and Demailly-Peternell-Schneider. In a similar vein, we show that a normal compact and K\"ahler 3-dimensional analytic space with terminal singularities and nef canonical bundle is a cyclic quotient of a simple non-projective torus if it carries no effective divisor. This is a crucial step to complete the bimeromorphic classification of compact K\"ahler 3-folds.
Added: May 13, 2013
Working paper
Ornea L., Verbitsky M. arxiv.org. math. Cornell University, 2015
A locally conformally Kahler manifold is a Hermitian manifold (M,I,ω) satisfying dω=θ∧ω, where θ is a closed 1-form, called the Lee form of M. It is called pluricanonical if ∇θ is of Hodge type (2,0)+(0,2), where ∇ is the Levi-Civita connection, and Vaisman if ∇θ=0. We show that a compact LCK manifold is pluricanonical if and only if the Lee form has constant length and the Kahler form of its covering admits an automorphic potential. Using a degenerate Monge-Ampere equation and the classification of surfaces of Kahler rank one, due to Brunella, Chiose and Toma, we show that any pluricanonical metric on a compact manifold is Vaisman. Several errata to our previous work are given in the last Section.
Added: Dec 5, 2015
Working paper
Zavertiaeva M. A., Parshakov P. Financial Economics. FE. Высшая школа экономики, 2013. No. 25.
In the era of the knowledge economy intangibles are recognized by investors as pivotal value drivers. Previous research of portfolio forming methods based on intangibles is limited by taking into account only the quantity of intangibles. We propose a tool to select companies able to create knowledge (in contrast to the absorption of knowledge), which is a quality of intangibles. To test whether these abilities are results of skill we implement a bootstrap procedure. It shows that only 22% of companies have the skills to create knowledge, but all of them are characterized by positive results of knowledge creation. To show the practical implications of the proposed approach selected companies are combined in a portfolio. This portfolio demonstrates a higher cumulative return, Sharpe ratio and drawdown than S&P500. We also find the increasing importance of intangibles for investors during the crisis. While exogenous shocks influenced both creators and absorbers, we found that intangibles create an obstacle to a sharp drop of market value.
Added: Feb 6, 2014
Working paper
Makarov A. Public Administration. PA. Высшая школа экономики, 2014. No. 20.
This article focuses on the development of antitrust policy in transition economies in the context of preventing explicit and tacit collusion. Experience of BRICS, Kazakhstan, Ukraine and CEE countries (Bulgaria, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, Slovenia, Czech Republic, Estonia) in the creation of antitrust institutions was analyzed, including both legislation and enforcement practice. This article analyzes such enforcement problems as: classification problems (tacit vs explicit collusion, vertical vs horizontal agreements), flexibility of prohibitions (“per se” vs “rule of reason”), design of sanctions, private enforcement challenge, leniency program mechanisms, the role of antitrust authorities etc. Main challenges for policy effectiveness in this field were shown
Added: Dec 4, 2014
Working paper
Myalo A. Working Papers. SSRN, 2019
Despite of the fact that the history of Initial Coin Offering (ICO) is short, new modification of it has already suggested. According to the ICORating , in the second half of 2018, the profitability of investments in blockchain startups decreased by 22%, and 58% of ICO projects announced in Q4 2018 were not able to raise more than 100,000 USD. Moreover, in Q4 2018 40% of projects with previously announced ICOs have already deleted their social network accounts and websites. The founder of Ethereum Vitalik Buterin (2015), who started the first ICO, proposed a new way of decentralized fundraising called DAICO in 2018. This new model will include elements of Decentralized Autonomous Organizations (DAO), and its purpose will be to minimize the difficulties and risks associated with the ICO. At the same time, in 2018 another model of financing appeared called Initial Exchange Offering (IEO) in order to minimize risks, problems of liquidity and the postponement of the listing of the tokens at the end of tokensale step. More than 70 IEOs listed on ICObench with average rating of 3.6 and 42 IEOs have been ended and raised $266 million in total. Nevertheless, there three types of tokens 95% of ICO projects are utility-based token. This makes ICO comparable to crowfunding. In order to be more attractive for investors the focus on a new wave of ICO projects is on the security type of tokens. The security token is any cryptocurrency that pays dividends, profits, shares or interest or invests in any other asset that also generates profits. The U.S. Securities and Exchange Commission (SEC) use the Howey Test and concludes the securities token are securities in contract to classical utility token of ICO projects. In order to back by real assets and follow the SEC's guidance on compliance, issuance, and trading new model is called Security Token Offering (STO) and differs from ICO. All three new models are a new focus for small and medium-sized enterprises (SME) and investors. The absence of any type of academic works emphasizes the relevance and scientific novelty of the forthcoming research. The contribution to the existing literature is the systematization of information and comparison analyses of ICO, DAOICO, IEO and STO by method of case study.
Added: Sep 4, 2019
Working paper
Karminsky A. M., Kostrov A., Murzenkov T. Financial Economics. FE. Высшая школа экономики, 2012. No. WP BRP 06/FE/2012.
Under the Basel II accord, improving probability of default models is a key risk-management priority. There are four main aspects of this research: suggesting the bank default classification; using a wide time horizon (quarterly Russian banking statistics from 1998 to 2011); investigating the macroeconomic and institutional characteristics of the banking sector environment and finally, testing the accuracy of the models developed. We have employed nonlinearity and automatic classification of the independent variables in our models, paying attention to the structure of the banking market as well as to the reliability of the models developed. We have compared several models for estimating default probabilities. From the results of this comparison, we have chosen the binary logit - regression with quasi panel data structure. Our key findings are: - There is a quadratic relationship between bank's capital adequacy ratio and its probability of default. - The "too big to fail" hypothesis does not hold for the Russian banking sector. - There is a negative relationship between the Lerner index and bank's PD. Macroeconomic, institutional and time factors significantly improve the model quality. We believe that these results will be useful for the national financial regulatory authorities as well as for risk-management in commercial banks. Moreover, we think that these models will be valuable for other emerging economies.
Added: Dec 10, 2012
Working paper
Grechikhin I. Cornell University Library, 2017
Added: Oct 20, 2017
Working paper
Rumyantzeva M. Working Papers of Humanities. WP. Издательский дом НИУ ВШЭ, 2015. No. Z19.
Regardless of all attempts to declare the end of modernity, contemporary political researchers still take its classical conception into account and attempt to redefine it with respect to present-day challenges. Nevertheless, it seems that there is little agreement on the definition of “modernity”. Consequently, a wide range of theories, devoted to modernity, have developed. One of the most popular is “multiple modernities” proposed by Shmuel Noah Eisenstadt. According to this conception, modern societies can be defined and institutionally organized in a variety of ways. The reason for this diversity concerns the tradition and history of a particular society. For instance, intellectual and political elites in non-Western countries can produce their own understanding of modernity, combining elements of traditional politics with some elements of the classical modern program. Therefore, the role of tradition in the contemporary world is ambivalent. In modern society, tradition does not continually determine all spheres of life, including politics. On the other hand, tradition still influences the way in which modern institutions are organized.  However, it is not clear to what extent tradition can vary the origin-program of modernity. To explore this question, we examine the alternative conception of modernity, known as compensation theory, proposed by Joachim Ritter, Hermann Lübbe and Odo Marquard. We employ a comparative analysis and demonstrate the differences between compensation theory and the conception of multiple modernities with regard to the role of tradition in modern society.The findings of this research illustrate the reasons behind the fact that tradition can influence the original program of modernity. It also contributes fruitfully to the discussion about modernization and modernity.
Added: May 30, 2015
Working paper
Zverev A. Working Papers of Centre for German and European Studies (CGES). ISSN 1860-5680. Centre for German and European Studies (CGES) Saint-Petersbugr State University University Bielefeld, 2015
The paper aims to identify key ideas, terms and assumptions and also to trace the development of two most cited methodological approaches in international relations theory. In order to make the comparison profound and clear, the author deploys Ukrainian conflict 2014-2015, where constructivism and neorealism have faced each other both at analytical (theoretical) and policymaking levels.
Added: May 25, 2016
Working paper
Anisimova A. I., Muradyan P. A., Vernikov A. V. SSRN Working Paper Series. Social Science Research Network, 2011. No. 1919817.
This empirical paper adds to competition and industrial organization literature by exploring the interplay between industry structure and competitiveness on local, rather than nation-wide, markets. We use micro-level statistical data for banks in two Russian regions (Bashkortostan and Tatarstan) to estimate Herfindahl-Hirschman index, Lerner index, and Panzar-Rosse model. We estimate Panzar-Rosse model in two ways: via the widely used price-equation that accounts for scale effects and then via a revenue-equation that disregards scale effects as suggested by Bikker et al. (2009). We find both regional markets to be ruled by monopolistic competition, although estimation by revenue-equation does not reject monopoly hypothesis for Tatarstan. Existence of sizeable locally-owned and operated institutions does not necessarily lead to higher competitiveness of the given regional market, and the results from non-structural methods of estimation suggest that bank competition in Bashkortostan is stronger than in Tatarstan. Going further away from aggregated analysis we compute Lerner indices in two product segments of Tatarstan – retail and corporate loans – and find that retail segment is significantly more competitive. Local banks exert more market power in corporate loans, while federal branches – in retail loans.
Added: May 14, 2012