10 results on '"Sushko, I."'
Search Results
2. Chapter 12. A Goodwin -Type Model with Cubic Investment Function
- Author
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Gardini, Laura, Puu, T, and Sushko, I.
- Published
- 2006
3. Movement-related brain potentials in 6- to 7-year-old children,Potentsialy mozga, sviazannye s dvizheniem u deteǐ 6--7 let
- Author
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Sergey Malykh, Kuznetsova, S. B., and Sushko, I. N.
4. Study of strange matter production in the heavy ion collisions at NUCLOTRON
- Author
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Ladygin, V., Ablyazimov, T. O., Aichelin, J., Andreev, V. V., Avdejchikov, V. V., Averianov, A. V., Avramenko, S. V., Akishina, V. P., Akishin, P. G., Aksinenko, V. D., Alfeev, A. V., Alfeev, V. S., Babkin, V. A., Baginyan, S. A., Balandin, V. P., Baranova, A. V., Barznat, M. I., Basylev, S. N., Belyakov, D. V., Bogdanova, G. A., Boguslavsky, I. V., Bolshakova, I. A., Boos, E. E., Bratkovskaya, E. L., Cassing, W., Chernenko, S. P., Davkov, V., Davkov, K., Demidova, V. I., Deng, Z., Derenovskaya, O. Yu, Donskov, S. V., Dunin, V. B., Ershov, A. A., Fateev, O. V., Fedorov, Yu I., Gapienko, V. A., Gavrishuk, O. P., Genchev, S. G., Golovatyuk, V. M., Golokhvastov, A. I., Golovnya, S. N., Grigalashvili, N., Guber, F. F., Gudima, K. K., Gumen, S., Gurchin, Yu V., Christoph Hartnack, Hayduchok, V., Heuser, J., Huang, X., Ivanov, V. V., Ivashkin, A. P., Ierusalimov, A. P., Ilgenfritz, E. -M, Isupov, A. Yu, Ivanets, V., Janek, M., Karachuk, Yu -T, Karmanov, D. E., Kekelidze, V. D., Kekelidze, G. D., Khabarov, V. S., Khabarov, S. V., Kholodenko, A. G., Khrenov, A. N., Kireev, V. I., Kiryushin, Yu T., Kisel, P. I., Kisel, I. V., Kogut, I., Kokoulina, E. S., Kolesnikov, V. I., Konchakovski, V., Kopko, B., Korolev, M. G., Korotkova, A. M., Kost, Y., Kovaljova, N., Kovtun, V. E., Kozachenko, L., Kravets, M., Kugler, A., Kurbatov, E. O., Kurepin, A. B., Kurilkin, A. K., Kurilkin, P. K., Kushpil, V., Kutov, A. Yu, Kuznezov, A. V., Kuzmin, N. A., Ladygin, E. A., Ladygin, V. P., Ladygina, N. B., Lebedev, A. A., Lenok, V. V., Levchenko, A., Li, Y., Linnyk, O., Lipchinski, D., Litvinenko, E. P., Lobastov, S. P., Lokhtin, I. P., Lukstins, J., Lyashchenko, V. N., Madigozhin, D. T., Makido, O., Maksimenko, N. V., Malakhov, A. I., Malinina, L. V., Martinska, M., Merkin, M. M., Mikhaylov, Yu V., Mialkovsky, V. V., Moroz, A., Murin, Yu N., Nagorny, S. N., Nakalov, Y., Nikitin, V. A., Nomokonov, P. V., Okhrimenko, O. V., Palynyak, I., Pavljuchkov, V. V., Parfenov, A. N., Petukhov, Yu P., Pechenov, V. N., Pechenova, O. Yu, Peshekhonov, V. D., Piyadin, S. M., Polyakov, V. A., Popovichi, J., Radkov, I. S., Radnev, S. V., Rakhlin, L., Raportirenko, A. M., Rashevski, G., Reva, S. N., Reznikov, S. G., Riadovikov, V. N., Rukoyatkin, P. A., Rufanov, I. A., Sadovsky, A. S., Semak, A. A., Senger, P., Shabunov, A. V., Shapovalov, H., Shejnast, V., Shkilyov, A. L., Shurygin, F., Shutov, A. V., Slepnev, V. M., Slepnev, I. V., Snigirev, A. M., Sushko, I., Suzdalev, V. I., Svoboda, O., Syschenko, V. V., Sychkov, S. Yu, Terekhin, A. A., Terlezky, A. V., Teryaev, O. V., Tiflov, V. V., Tikhomirov, V. V., Tlusty, P., Topilin, N. D., Trpisova, B., Tsupa, Yu P., Turchin, A. A., Tymoshyn, S., Ukhanov, M. N., Usenko, E. A., Urban, J., Vasendina, V. A., Vasiliev, T. A., Vassiliev, Yu, Vladimirova, N. M., Vishnevsky, A. V., Vnukov, I. E., Vokal, S., Volgin, S. V., Volkov, V. Yu, Vorobiev, A. P., Voronin, A. G., Voronyuk, V. V., Voroshylo, H., Wang, J., Wang, Y., Yerashok, V., Yukaev, A. I., Zagachevskyi, Y., Zaljyubovsky, I. I., Zanevsky, Yu V., Zenkov, A., Zhu, X., Zinchenko, A. P., Zrelov, P. V., and Zryuev, V. N.
5. Codimension-two border collision bifurcation in a two-class growth model with optimal saving and switch in behavior
- Author
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Iryna Sushko, Ingrid Kubin, Pasquale Commendatore, Sushko, I., Commendatore, P., and Kubin, I.
- Subjects
Applied Mathematics ,Mechanical Engineering ,05 social sciences ,Mathematical analysis ,Aerospace Engineering ,Ocean Engineering ,Fixed point ,Parameter space ,01 natural sciences ,codimention 2 - border collision bifurcation, two class growth model, optimal saving decision ,010305 fluids & plasmas ,Transcritical bifurcation ,Bifurcation theory ,Control and Systems Engineering ,0502 economics and business ,0103 physical sciences ,Attractor ,Piecewise ,Two-class growth model, Piecewise smooth discontinuous map, Border collision bifurcation, Period adding bifurcation structure ,050207 economics ,Electrical and Electronic Engineering ,Multistability ,Bifurcation ,Mathematics - Abstract
We consider a two-class growth model with optimal saving and switch in behavior. The dynamics of this model is described by a two-dimensional (2D) discontinuous map. We obtain stability conditions of the border and interior fixed points (known as Solow and Pasinetti equilibria, respectively) and investigate bifurcation structures observed in the parameter space of this map, associated with its attracting cycles and chaotic attractors. In particular, we show that on the x-axis, which is invariant, the map is reduced to a 1D piecewise increasing discontinuous map, and prove the existence of a corresponding period adding bifurcation structure issuing from a codimension-two border collision bifurcation point. Then, we describe how this structure evolves when the related attracting cycles on the x-axis lose their transverse stability via a transcritical bifurcation and the corresponding interior cycles appear. In particular, we show that the observed bifurcation structure, being associated with the 2D discontinuous map, is characterized by multistability, that is impossible in the case of a standard period adding bifurcation structure.
- Published
- 2020
6. Growing through chaotic intervals
- Author
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Ahmad Naimzada, Iryna Sushko, Laura Gardini, Gardini, L, Sushko, I, and Naimzada, A
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Economics and Econometrics ,Plane (geometry) ,Chaotic ,Structure (category theory) ,Chaos, Bifurcation, Economic Growth ,Interval (mathematics) ,Growth model ,Fixed point ,Nonlinear Sciences::Chaotic Dynamics ,Economics ,Applied mathematics ,SECS-S/06 - METODI MATEMATICI DELL'ECONOMIA E DELLE SCIENZE ATTUARIALI E FINANZIARIE ,SECS-P/01 - ECONOMIA POLITICA ,Mathematical economics ,Bifurcation - Abstract
We consider a growth model proposed by Matsuyama [K. Matsuyama, Growing through cycles, Econometrica 67 (2) (1999) 335–347] in which two sources of economic growth are present: the mechanism of capital accumulation (Solow regime) and the process of technical change and innovations (Romer regime). We will shown that no stable cycle can exist, except for a fixed point and a cycle of period two. The Necessary and Sufficient conditions for regular or chaotic regimes are formulated. The bifurcation structure of the two-dimensional parameter plane is completely explained. It is shown how the border-collision bifurcation leads from the stable fixed point to pure chaotic regime (which consists either in 4-cyclical chaotic intervals, 2-cyclical chaotic intervals or in one chaotic interval).
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- 2008
7. Recent Developments in Asset Pricing with Heterogeneous Beliefs and Adaptive Behaviour of Financial Markets
- Author
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Xue-Zhong He, Bischi, GI, Chiarella, C, and Sushko, I
- Subjects
Stylized fact ,Market anomalies ,Adaptive behaviour ,Financial economics ,Financial market ,Economics ,Capital asset pricing model ,Rational agent ,Statistical finance ,Bounded rationality - Abstract
Heterogeneity and interacting among boundedly rational agents have received increasing attention in the finance and economics literature. Recent developments on the role of heterogeneous beliefs on asset pricing and the adaptive behaviour of financial markets shed light into the complex behaviour of financial markets and provide some explanations of certain market behaviour and anomalies. This paper surveys these developments, to which the author and several coauthors have contributed in several papers, and discusses the extent to which they can address market anomalies, complexity, and stylized facts in financial markets.
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- 2012
8. A Reconsideration of the Formal Minskyan Analysis: Microfundations, Endogenous Money and the Public Sector
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Carl Chiarella, Corrado Di Guilmi, Bischi, GI, Chiarella, C, and Sushko, I
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Capitalist economy ,Endogenous money ,Complex dynamics ,Work (electrical) ,Public economics ,business.industry ,Keynesian economics ,Control (management) ,Public sector ,Economics ,business ,Financial instability - Abstract
The paper presents a survey of the literature that has grown out of the work of Hyman Minsky and, in particular, of the main models which have mathematically formalised the cyclical dynamics of a capitalist economy implied by the Financial Instability Hypothesis. We identify some of the issues that the existing literature has left unsolved. We then briefly summarise the contributions by Chiarella and Di Guilmi (J Econ Dyn Control 35(8):1151–1171, 2011c) and (Stud Nonl Dyn Econom forthcoming, 2012), highlighting how these papers have addressed the open questions and how they could be further developed.
- Published
- 2012
9. Applicability domains for classification problems: Benchmarking of distance to models for Ames mutagenicity set
- Author
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Robert Körner, Gilles Marcou, Huanxiang Liu, Dragos Horvath, Roberto Todeschini, Phuong Dao, Xiaojun Yao, Douglas M. Young, Paola Gramatica, A. Varnek, A. Artemenko, Todd M. Martin, Anil Kumar Pandey, Farhad Hormozdiari, Eugene N. Muratov, Alexander Tropsha, Christophe Muller, Artem Cherkasov, Tomas Öberg, Katja Hansen, Lili Xi, Timon Schroeter, Pavel G. Polishchuk, Sergii Novotarskyi, Jiazhong Li, Volodymyr V. Prokopenko, Denis Fourches, Victor E. Kuz’min, Cenk Sahinalp, Igor I. Baskin, Klaus-Robert Müller, Igor V. Tetko, Iurii Sushko, Chimie de la matière complexe (CMC), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Sushko, I, Novotarskyi, S, Körner, R, Pandey, A, Cherkasov, A, Li, J, Gramatica, P, Hansen, K, Schroeter, T, Müller, K, Xi, L, Liu, H, Yao, X, Öberg, T, Hormozdiari, F, Dao, P, Sahinalp, C, Todeschini, R, Polishchuk, P, Artemenko, A, Kuz'Min, V, Martin, T, Young, D, Fourches, D, Tropsha, A, Baskin, I, Horbath, D, Marcou, G, Varnek, A, Prokopenko, V, and Tetko, I
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Quantitative structure–activity relationship ,General Chemical Engineering ,Quantitative Structure-Activity Relationship ,Library and Information Sciences ,computer.software_genre ,01 natural sciences ,Standard deviation ,Set (abstract data type) ,03 medical and health sciences ,CHIM/01 - CHIMICA ANALITICA ,Similarity (network science) ,030304 developmental biology ,Mathematics ,0303 health sciences ,Principal Component Analysis ,QSAR ,Mutagenicity Tests ,mutagenicity ,General Chemistry ,Classification ,0104 chemical sciences ,Computer Science Applications ,Ames test ,Data set ,010404 medicinal & biomolecular chemistry ,Benchmarking ,Test set ,Metric (mathematics) ,Data mining ,computer ,Algorithm ,[CHIM.CHEM]Chemical Sciences/Cheminformatics ,Applicability domain - Abstract
The estimation of accuracy and applicability of QSAR and QSPR models for biological and physicochemical properties represents a critical problem. The developed parameter of "distance to model" (DM) is defined as a metric of similarity between the training and test set compounds that have been subjected to QSAR/QSPR modeling. In our previous work, we demonstrated the utility and optimal performance of DM metrics that have been based on the standard deviation within an ensemble of QSAR models. The current study applies such analysis to 30 QSAR models for the Ames mutagenicity data set that were previously reported within the 2009 QSAR challenge. We demonstrate that the DMs based on an ensemble (consensus) model provide systematically better performance than other DMs. The presented approach identifies 30-60% of compounds having an accuracy of prediction similar to the interlaboratory accuracy of the Ames test, which is estimated to be 90%. Thus, the in silico predictions can be used to halve the cost of experimental measurements by providing a similar prediction accuracy. The developed model has been made publicly available at http://ochem.eu/models/1 .
- Published
- 2010
10. Critical assessment of QSAR models of environmental toxicity against Tetrahymena pyriformis: focusing on applicability domain and overfitting by variable selection
- Author
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Tomas Öberg, Anil Kumar Pandey, Roberto Todeschini, Denis Fourches, Alexander Tropsha, Alexandre Varnek, Igor V. Tetko, Iurii Sushko, Ester Papa, Hao Zhu, Chimie de la matière complexe (CMC), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Tetko, I, Sushko, I, Pandey, A, Zhu, H, Tropsha, A, Papa, E, Oberg, T, Todeschini, R, Fourches, D, and Varnek, A
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Quantitative structure–activity relationship ,Databases, Factual ,QSAR, validation, applicability domain, variable selection ,General Chemical Engineering ,Normal Distribution ,Quantitative Structure-Activity Relationship ,Feature selection ,Library and Information Sciences ,Overfitting ,01 natural sciences ,Models, Biological ,Standard deviation ,03 medical and health sciences ,CHIM/01 - CHIMICA ANALITICA ,Predictive Value of Tests ,Statistics ,Toxicity Tests ,Leverage (statistics) ,Animals ,Computer Simulation ,030304 developmental biology ,Statistical hypothesis testing ,Mathematics ,0303 health sciences ,Models, Statistical ,Tetrahymena pyriformis ,Reproducibility of Results ,General Chemistry ,0104 chemical sciences ,Computer Science Applications ,010404 medicinal & biomolecular chemistry ,Test set ,Environmental Pollutants ,Biological system ,[CHIM.CHEM]Chemical Sciences/Cheminformatics ,Applicability domain - Abstract
The estimation of the accuracy of predictions is a critical problem in QSAR modeling. The "distance to model" can be defined as a metric that defines the similarity between the training set molecules and the test set compound for the given property in the context of a specific model. It could be expressed in many different ways, e.g., using Tanimoto coefficient, leverage, correlation in space of models, etc. In this paper we have used mixtures of Gaussian distributions as well as statistical tests to evaluate six types of distances to models with respect to their ability to discriminate compounds with small and large prediction errors. The analysis was performed for twelve QSAR models of aqueous toxicity against T. pyriformis obtained with different machine-learning methods and various types of descriptors. The distances to model based on standard deviation of predicted toxicity calculated from the ensemble of models afforded the best results. This distance also successfully discriminated molecules with low and large prediction errors for a mechanism-based model developed using log P and the Maximum Acceptor Superdelocalizability descriptors. Thus, the distance to model metric could also be used to augment mechanistic QSAR models by estimating their prediction errors. Moreover, the accuracy of prediction is mainly determined by the training set data distribution in the chemistry and activity spaces but not by QSAR approaches used to develop the models. We have shown that incorrect validation of a model may result in the wrong estimation of its performance and suggested how this problem could be circumvented. The toxicity of 3182 and 48774 molecules from the EPA High Production Volume (HPV) Challenge Program and EINECS (European chemical Substances Information System), respectively, was predicted, and the accuracy of prediction was estimated. The developed models are available online at http://www.qspr.org site. © 2008 American Chemical Society.
- Published
- 2008
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