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Of all publications in the section: 3 519
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Working paper
Alexander Zlotnik, Ilya Zlotnik. Working papers by Cornell University. Cornell University, 2016. No. 1609.07758.
We present direct logarithmically optimal in theory and fast in practice algorithms to implement the tensor product high order finite element method on multi-dimensional rectangular parallelepipeds for solving PDEs of the Poisson kind. They are based on the well-known Fourier approaches. The key new points are the fast direct and inverse FFT-based algorithms for expansion in eigenvectors of the 1D eigenvalue problems for the high order FEM. The algorithms can further be used for numerous applications, in particular, to implement the tensor product high order finite element methods for various time-dependent PDEs. Results of numerical experiments in 2D and 3D cases are presented.
Added: Sep 29, 2016
Working paper
Zasimova L. S., Shishkin S. Public Administration. PA. Высшая школа экономики, 2013. No. WP BRP 07/PA/2013.
The adoption of new medical technologies in Russian public hospitals is an important part of healthcare modernization and thus is a subject for public finance and regulation. Here we examine the decision-making process on adoption of new technologies in Russian hospitals, and the institutional environment in which they are made. We find that public hospitals operate within a strategic-institutional model of decision making and tend to adopt technologies that bring indirect benefits to their heads/physicians. Unlike Western clinics, the interests of Russian hospital heads and physicians are driven by the possibilities to obtain income from a part of hospital activities: the provision of chargeable medical services to the population, as well as receiving informal payments from patients. The specifically Russian feature of the decision-making process is that hospitals are strongly dependent on health authorities’ decisions about new equipment acquisition. The inefficiency problems arise from the contradiction between hospitals’ and authorities’ financial motivation for acquiring new technologies: hospitals tend to adopt technologies that bring benefits to their heads/physicians and minimize maintenance and servicing costs, while authorities’ main concern is initial cost of technology. The main reason for inefficiency of medical technology adoption arises from centralization of procurement of medical equipment for hospitals that creates the preconditions for rent-seeking behaviour of persons making such decisions.
Added: Dec 30, 2013
Working paper
Caroleo F. E., Coppola G., Semerikova E. V. Annals of CRISEI 2018. ISBN: 978-88-98279-07-4. University of Naples Parthenope, 2018
Added: Jul 10, 2019
Working paper
Rusinova V. Basic research program. WP BRP. National Research University Higher School of Economics, 2019. No. 87.
This article concentrates on two recent judgments issued by the European Court of Human Rights (ECHR) Chambers, on Centrum för Rättvisa v. Sweden and Big Brother Watch and Others v. the United Kingdom, which expressly acknowledged that mass surveillance per se does not violate the Convention on the Protection of Human Rights and Fundamental Freedoms. These judgments have been recently referred to the Grand Chamber, thus giving hope that the approach taken in respect of the launch of mass interception of communications and metadata has a chance to be revisited.  The author reveals whether this approach follows from the jurisprudence of the ECHR, how plausible the argumentation of this court is and how legalization for the bulk interception of data relates to the stance taken by the ECJ, which until that time was dealing with questions of the protection of the right to respect for private life and personal data using the general paths initially paved by the ECHR. The article discloses what precise content in terms of the protection of right to respect for private life lies behind the main findings on the compatibility of bulk interception per se with the Convention on the Protection of Human Rights and Fundamental Freedoms, namely, in which part this court has refused to examine the measures undertaken by states in compliance with Article 8 and in which parts it has strengthened (or relaxed) already inferred criteria. Finally, taking into account the current position of the ECHR at this crossroads, the article dwells on causes that influenced the decisions of its Chambers.
Added: Apr 1, 2019
Working paper
Ivan Cheltsov, Park J., Won J. arxiv.org. math. Cornell University, 2013
We show that affine cones over smooth cubic surfaces do not admit non-trivial $\mathbb{G}_a$ -actions.
Added: Dec 27, 2013
Working paper
Busjatskaja I., Kochetkov Y. arxiv.org. math. Cornell University, 2016. No. 1607.05325.
A non-degenerate two-dimentional linear operator Ф  transforms the unit circle into ellipse.We define the coefficient of deformation k(Ф), as the relation of the lendth of the smaller ellipses axis to its bigger one. In this work we compute the mean value of k(Ф).Analogously, we define the deformation coefficient  k(Ф) in three-dimensional case and give an estimation of its mean value.
Added: Jun 28, 2017
Working paper
Busjatskaja I., Kochetkov Y. math. arxive. Cornell University, 2016. No. 1603.02938.
In this work we demonstrate, how the use of polar decomposition allows one to  understand metric proporties of non-degenerate linear operators on the plane. We study how the non-isometric operatpr changes the length of vectors and the angles between the vectors.
Added: Mar 10, 2016
Working paper
Chistyakov Vyacheslav V. arxiv.org. math. Cornell University, 2011. No. 1112.5561v1.
The notion of a (metric) modular on an arbitrary set and the corresponding modular space, more general than a metric space, were introduced and studied recently by the author [V.V. Chistyakov, Metric modulars and their application, Dokl. Math. 73 (1) (2006) 32–35, and Modular metric spaces, I: Basic concepts, Nonlinear Anal. 72 (1) (2010) 1–14]. In this paper we establish a fixed point theorem for contractive maps in modular spaces. It is related to contracting rather “generalized average velocities” than metric distances, and the successive approximations of fixed points converge to the fixed points in a weaker sense as compared to the metric convergence.
Added: Feb 6, 2013
Working paper
Takeyama A., Constantinou N., Vinogradov D. IMES Discussion Paper Series. Institute for Monetary and Economic Studies, Bank of Japan, 2012. No. 2012-E-14.
This paper develops a framework to estimate the probability of default (PD) implied in listed stock options. The underlying option pricing model measures PD as the intensity of a jump diffusion process, in which the underlying stock price jumps to zero at default. We adopt a two-stage calibration algorithm to obtain the precise estimator of PD. In the calibration procedure, we improve the fitness of the option pricing model via the implementation of the time inhomogeneous term structure model in the option pricing model. Since the term structure model perfectly fits the actual term structure, we resolve the estimation bias caused by the poor fitness of the time homogeneous term structure model. It is demonstrated that the PD estimator from listed stock options can provide meaningful insights on the pricing of credit derivatives like credit default swap.
Added: Jun 27, 2018
Working paper
Piskunova N. African Horn: Security Challenged. 111. The Edwin Mellen Press, 2014
This monograph  reviews key challenges to security in the region of North-East Africa, specifically in the area of the African Horn region. The issues discussed in this book, include the problems of soft security in this region, namely the problem of democratic transitions and hybrid regimes, terrorism and radicalization of muslim organizations, foreign policy issues and conflict between Ethiopia and Eritrea in 1998-2000, issue of state failure in Somalia and other related issues.
Added: May 6, 2014
Working paper
Kazun A. D., Kazun A. Political Science. PS. Высшая школа экономики, 2017. No. WP BRP 51/PS/2017.
Donald Trump and his team have often been accused of having close ties to Russia and Russians expressed much greater support for Trump than residents of other countries. This article provides the first systematic analysis of Russian media coverage of Trump's activities during and after the election campaign. It concludes, on the basis of a sentiment analysis of relevant articles and network agendas of 500 Russian magazines and 250 leading federal newspapers, that Trump's media portrayal was not necessarily positive. During the election, Trump was portrayed by the Russian media not as Russia's favorite candidate, but as Hillary Clinton's opponent and a critic of U.S. recent policies. Only for a short period after Trump's victory in the elections, did the Russian media represent him as a friend of Russia, since there was hope that the new president would lift political and economic sanctions. Trump's policies failed to meet the expectations of the Russian people, and from the beginning of 2017, media coverage of Trump has become critical, hopes for lifting of political sanctions have weakened, and public opinion about the U.S. president has turned negative.
Added: Nov 13, 2017
Working paper
Gimpelson V. E., Kapeliushnikov R. Discussion Paper. IZA DP. Institute for the Study of Labor, 2017. No. 11126.
This paper deals with age and educational dimensions of the labour supply in Russia and explores two time periods: from 2000 to 2015 (retrospective), and the next 15 years (prospective). For our analysis we exploit the micro-census (2015) data and all LFS waves covering the retrospective period. Combining demographic projections with expected employment rates and data on educational achievement we forecast the employment composition up to 2030. If recent past changes in both age and education have contributed to economic growth, their effect is likely to be negative in the next 15 years. These two dimensions are directly associated with such challenges as ageing and over-education of the labour force. Russia is not unique here, but it is more exposed to both dimensions than are many other countries due to its demographic and educational developments. The paper concludes with several tentative policies that could ease, although not cure, the problem.
Added: Nov 18, 2017
Working paper
Rodionova L., Kopnova E. Economics. EC. Высшая школа экономики, 2015. No. 117.
A comparative analysis of the age impact on happiness in Russia and European countries was conducted. The European Social Survey data in 2012 for 29 countries were used. On the basis of an ordered logistic regression, a U-shape relationship between age and happiness was obtained for some of the analysed countries. By using cluster analysis, the countries were divided into 3 groups, in which the age effect varies greatly. In the counties of group 1 (for example, Iceland and Norway) happiness did not change at any age or increase smoothly in old age. Group 2 (Germany and France) had a clear U-shaped age-happiness form. Russia and some counties of former Soviet Union: Ukraine, Lithuania and Estonia were analysed in group 3, where the level of happiness decreased significantly in old age (over 60). In some countries (Belgium, Switzerland, Cyprus, Denmark, Finland, Israel, Italy, Sweden) all people were happy, regardless of age and the assumption of age-happiness U-shape relation was not found. The socio-economic determinants of happiness were also analysed in different age groups. Income satisfaction and subjective health were the more significant characteristics.
Added: Dec 24, 2015
Working paper
Stepanov S., Suvorov A. Исследования по экономике и финансам. WP9. Высшая школа экономики, 2015. No. 2.
We propose a model in which an entrepreneur, seeking outside fi nancing, sells a large equity share to an outside blockholder in order to signal his low propensity to extract private benefi ts. A conventional theoretical rationale for the presence of an outside block holder is mitigation of the agency problem via some type of monitoring or intervention. Our model provides a novel insight: outside blockholders may be attracted by fi rms with low, rather than high, agency problems. Our result yields a new implication for the interpretation of an often documented positive relationship between outside ownership concentration in a fi rm and its market valuation: such relationship may be driven by “sorting” rather than by a direct effect of blockholder monitoring. In fact, we show that the positive correlation may arise even if the blockholder derives private benefi ts and has no positive impact on the value of small shares. Finally, we argue that our analysis may help explain why the market reacts more favorably to private placements of equity as opposed to public issues.
Added: Dec 4, 2015
Working paper
Koltsova O., Pashakhin S. Basic research program. WP BRP. National Research University Higher School of Economics, 2017. No. 79/SOC/2017.
Although conflict representation in media has been widely studied, few attempts have been made to perform large-scale comparisons of agendas in the media of conflicting parties, especially for armed country-level confrontations. In this paper, we introduce quantitative evidence of agenda divergence between the media of conflicting parties in the course of the Ukrainian crisis 2013-2014. Using 45,000 messages from the online newsfeeds of a Russian and a Ukrainian TV channels, we perform topic modelling coupled with qualitative analysis to reveal crisis-related topics, assess their salience and map evolution of attention of both channels to each of those topics. We find that the two channels produce fundamentally different agenda sequences: in particular, while the Russian channel pays little attention to confrontation between the Ukrainian government and the opposition before the regime change, the Ukrainian channel is less inclined to cover armed violence in East Ukraine and refugees after the regime change.
Added: Dec 29, 2017
Working paper
Kazun A. D. Political Science. PS. Высшая школа экономики, 2017. No. WP BRP 49/PS/2017.
The purpose of this study is to test the agenda-setting theory, according to which the media has a significant impact on what people consider to be important events. We compare the results of the Levada Center surveys on the most memorable events of the month with the number of publications on these issues in the press. We focused on the period from January 2014 to December 2016. A total of 884 events were analyzed in the article. The results of the study confirm the impact of discussions in the media on people's attention to the problem. The results also show that the discussions in the media one week before the date of polling are more important than the issues covered over the entire month. People better remember those events which took place shortly before the polling, as well as the events the discussion of which intensified during this period. It is also important to note the role of regional publications in the sensitization of the public to various issues. The issues covered by the national newspapers and news agencies, but ignored by the regional press, are much worse remembered by the population. The results of the study are controlled for background of the discussion: the presence of important events in each relevant month, which monopolized the public attention, is taken into account.
Added: Sep 6, 2017
Working paper
Bronevich A. G. Математические методы анализа решений в экономике, бизнесе и политике. WP7. Издательский дом ВШЭ, 2015. No. 1.
Added: Apr 8, 2015
Working paper
Mammen E., Van den Berg G., Janys L. et al. Discussion Paper. IZA DP. Institute for the Study of Labor, 2014. No. 8339.
We examine a new general class of hazard rate models for survival data, containing a parametric and a nonparametric component. Both can be a mix of a time effect and (possibly time-dependent) marker or covariate effects. A number of well-known models are special cases. In a counting process framework, a general profile likelihood estimator is developed and the parametric component of the model is shown to be asymptotically normal and efficient. The analysis improves on earlier results for special cases. Finite sample properties are investigated in simulations. The estimator is shown to work well under realistic empirical conditions. The estimator is applied to investigate the long-run relationship between birth weight and later-life mortality using data from the Uppsala Birth Cohort Study of individuals born in 1915-1929. The results suggest a relationship that is difficult to capture with simple parametric specifications. Moreover, its shape at higher birth weights differs across gender.
Added: Oct 12, 2016
Working paper
Maxim Borisyak, Ustyuzhanin A. arxiv :: cs :: Cornell University. arxiv :: cs :: Cornell University. Cornell University, 2015
The problem of autonomous navigation is one of the basic problems for robotics. Although, in general, it may be challenging when an autonomous vehicle is placed into partially observable domain. In this paper we consider simplistic environment model and introduce a navigation algorithm based on Learning Classifier System.
Added: Nov 9, 2015
Working paper
Lazarev A. A., Werner F. Otto-von-Guericke Universitaet, 2008. No. 15.
In this paper we consider a graphical realization of dynamic programming. The concept is discussed on the partition and knapsack problems. In contrast to dynamic programming, the new algorithm can also treat problems with non-integer data without necessary transformations of the corresponding problem. We compare the proposed method with existing algorithms for these problems on small-size instances of the partition problem with $n \le 10$ numbers. For almost all instances, the new algorithm considers on average substantially less "stages" than the dynamic programming algorithm.
Added: Mar 4, 2013