124,398 research outputs found
Development of technology for production of bakery products a long shelf life flour from different types
No full textTkachenko N. Development of technology for production of bakery products a long shelf life flour from different types / N. Tkachenko, V. Dobrovolsky ; sci. supervisor I. Solonytska // Збірник наукових праць молодих учених, аспірантів та студентів / Одес. нац. акад. харч. технологій; гол. ред. Б.В. Єгоров, заст. гол. ред. Л.В. Капрельянц, Н.М. Поварова, відп. ред. Г.М. Станкевич. – Одеса: ОНАХТ, 2016. – с. 55–56 : – Бібліогр.: 4 назв
BASIC TERMS OF MARKETING
No full textTkachenko, L. L. Basic terms of marketing / L. L.Tkachenko, N. Lebedeva // Proceedings of the 1st International Scientific Conference EUROPEAN CONFERENCE OF MANAGEMENT AND ECONOMICS. Ljubljana May 24, 2019. - Р. 318-321
The role of collective motion in examples of coarsening and self-assembly
No full textThe simplest prescription for building a patterned structure from its constituents is to add particles, one at a time, to an appropriate template. However, self-organizing molecular and colloidal systems in nature can evolve in much more hierarchical ways. Specifically, constituents (or clusters of constituents) may aggregate to form clusters (or clusters of clusters) that serve as building blocks for later stages of assembly. Here we evaluate the character and consequences of such collective motion in a set of prototypical assembly processes. We do so using computer simulations in which a system's capacity for hierarchical dynamics can be controlled systematically. By explicitly allowing or suppressing collective motion, we quantify its effects. We find that coarsening within a two dimensional attractive lattice gas (and an analogous off-lattice model in three dimensions) is naturally dominated by collective motion over a broad range of temperatures and densities. Under such circumstances, cluster mobility inhibits the development of uniform coexisting phases, especially when macroscopic segregation is strongly favored by thermodynamics. By contrast, the assembly of model viral capsids is not frustrated but is instead facilitated by collective moves, which promote the orderly binding of intermediates consisting of several monomers
Dominating Set, Independent Set, Discrete k-Center, Dispersion, and Related Problems for Planar Points in Convex Position
No full textGiven a set P of n points in the plane, its unit-disk graph G(P) is a graph with P as its vertex set such that two points of P are connected by an edge if their (Euclidean) distance is at most 1. We consider several classical problems on G(P) in a special setting when points of P are in convex position. These problems are all NP-hard in the general case. We present efficient algorithms for these problems under the convex position assumption.
● For the problem of finding the smallest dominating set of G(P), we present an O(knlog n) time algorithm, where k is the smallest dominating set size. We also consider the weighted case in which each point of P has a weight and the goal is to find a dominating set in G(P) with minimum total weight; our algorithm runs in O(n³log² n) time. In particular, for a given k, our algorithm can compute in O(kn²log² n) time a minimum weight dominating set of size at most k (if it exists).
● For the discrete k-center problem, which is to find a subset of k points in P (called centers) for a given k, such that the maximum distance between any point in P and its nearest center is minimized. We present an algorithm that solves the problem in O(min{n^{4/3}log n+knlog² n,k² nlog²n}) time, which is O(n²log² n) in the worst case when k = Θ(n). For comparison, the runtime of the current best algorithm for the continuous version of the problem where centers can be anywhere in the plane is O(n³ log n).
● For the problem of finding a maximum independent set in G(P), we give an algorithm of O(n^{7/2}) time and another randomized algorithm of O(n^{37/11}) expected time, which improve the previous best result of O(n⁶log n) time. Our algorithms can be extended to compute a maximum-weight independent set in G(P) with the same time complexities when points of P have weights.
- If we are looking for an (unweighted) independent set of size 3, we derive an algorithm of O(nlog n) time; the previous best algorithm runs in O(n^{4/3}log² n) time (which works for the general case where points of P are not necessarily in convex position).
- If points of P have weights and are not necessarily in convex position, we present an algorithm that can find a maximum-weight independent set of size 3 in O(n^{5/3+δ}) time for an arbitrarily small constant δ > 0. By slightly modifying the algorithm, a maximum-weight clique of size 3 can also be found within the same time complexity.
● For the dispersion problem, which is to find a subset of k points from P for a given k, such that the minimum pairwise distance of the points in the subset is maximized. We present an algorithm of O(n^{7/2}log n) time and another randomized algorithm of O(n^{37/11}log n) expected time, which improve the previous best result of O(n⁶) time.
- If k = 3, we present an algorithm of O(nlog² n) time and another randomized algorithm of O(nlog n) expected time; the previous best algorithm runs in O(n^{4/3}log² n) time (which works for the general case where points of P are not necessarily in convex position)
Local moment problem
No full textThe work is devoted to the local moment problem, which consists in finding of non-decreasing functions on the real axis
having given first 2n+1; n = 0,1,2,...; power moments on the whole axis and also 2m+1 first power moments on a certain finite
axis interval. Considering the local moment problem as a combination of the Hausdorff and Hamburger truncated moment
problems we obtain the conditions of its solvability and describe the class of its solutions with minimal number of growth
points if the problem is solvable.Adamyan, V.; Tkachenko Gorski, IM. (2014). Local moment problem. Proceedings in Applied Mathematics and Mechanics. 14(1):981-982. doi:10.1002/pamm.201410471S981982141N.I. Akhiezer The classical moment problem and some related questions in analysis, Hafner Publishing N.Y. Company (1965).M.G. Krein Nudel'man A.A., The Markov moment problem and extremal problems, Translation of Mathematical Monographs AMS, 50 (1977).V. Adamyan I. Tkachenko Solution of the Truncated Matrix Hamburger Moment Problem According to M.G. Krein. Operator Theory: Advances and Applications, vol. 118(Proceedings of the Mark Krein International Conference on Operator Theory and Applications, vol.II, Operator Theory and Related Topics), Birkhäuser Verlag Basel, (2000), 32 - 51.V. Adamyan I. Tkachenko M. Urrea Solution of the Stieltjes truncated moment problem, J. Applied Analysis, vol. 9, N.1 (2003) 57-74.V. Adamyan I. Tkachenko Solution of the Stieltjes Truncated Matrix Moment Problem, Opuscula Mathematica, v. 25/1 (2005), 5-24.V. Adamyan I. Tkachenko General Solution of the Stieltjes Truncated Matrix Moment Problem, Operator Theory: Advances and Applications v. 163 (2005), 1- 22
Creative activity of historian, local researcher, etnographer, dissident Borys Tkachenko: problems of the past and present
No full textДемиденко, Н. Творча спадщина історика, краєзнавця, етнографа, дисидента Бориса Ткаченка: проблеми минувшини і сьогодення [Електронний ресурс] / Демиденко Надія // Історія науки і біографістика. - 2022. - № 4. - С. 120-138. - Режим доступу: http://nbuv.gov.ua/UJRN/INB_Title_2022_4_13.Висвітлено діяльність історика, етнографа, культурно-громадського діяча Бориса Івановича Ткаченка, автора 11 книг – оригінальних досліджень з найрезонансніших і найболючіших тем української історії. Констатовано, що перші праці автора – агронома й історика за фахом – присвячені передовим методам господарювання на землі, включаючи екологічні фактори як головні для збереження земельних ресурсів. Акцентовано на вагомих результатах науково-дослідницької роботи Б. Ткаченка про репресії радянської влади в Україні у 30-х рр. ХХ ст. Проаналізовано його книгу «Під чорним тавром», яка стала першою, виданою в Україні, що розкривала злочини Голодомору 1932-1933 рр. як на основі архівних джерел, так і спогадів очевидців. Відзначено вагомий внесок Б. Ткаченка у розвиток краєзнавства та фольклористики. Науковцю вдалося дослідити факти, що стосуються життя і побуду окремих територій України, починаючи від часів її заселення, відтак збагатити збіднене уявлення про явища і події вітчизняної історії.The article highlights the activities of historian, ethnographer, cultural and social activist Borys Ivanovych Tkachenko (born in 1937), the author of 11 books – original studies on the most resonant and painful topics of Ukrainian history. It was established that the author, who is an agronomist and historian by profession, devoted his first works to problematic issues of land management, including ecological factors as the main ones for preserving land resources. Attention is focused on the significant results of B. Tkachenko's research work on the repression of the Soviet authorities in Ukraine in the 1930s of the XX century. In particular, the author's book "Under the Black Brand" was analyzed, which became the first book published in Ukraine that revealed the crimes of the Holodomor in 1932-1933, both on the basis of archival sources and the memories of eyewitnesses. It is noted about B. Tkachenko's significant contribution to the development of local history, in particular his works, which highlight the history of individual territories of Ukraine, starting from the time of their settlement. The researcher managed to research and record facts and documents related to the life and development of a particular area, thereby enriching the impoverished idea of certain phenomena and events of our general history. After all, the general is revealed in the individual, and the individual exists in the general. The scientific work of the researcher as a folklorist in the collection and popularization of folk songs of the region was noted. When writing the article, general historical (comparative-historical, retrospective) methods and the method of source analysis were used.Исследована деятельность историка, этнографа, культурно-общественного деятеля Бориса Ивановича Ткаченко, автора 11 книг – оригинальных исследований по самым резонансным и болезненным темам украинской истории. Констатировано, что первые труды автора – агронома и историка по специальности – посвящены передовым методам хозяйствования на земле, включая экологические факторы как главные для сохранения земельных ресурсов. Акцентировано на весомых результатах научно-исследовательской работы Б. Ткаченко о репрессиях советской власти в Украине в 30-х гг. ХХ ст. Проанализирована его книга «Под черным клеймом», которая стала первой, изданной в Украине, раскрывавшей преступления Голодомора 1932-1933 гг. как на основе архивных источников, так и воспоминаний очевидцев. Отмечен весомый вклад Б. Ткаченко в развитие краеведения и фольклористики. Ученому удалось исследовать факты, касающиеся жизни и построения отдельных территорий Украины, начиная со времен ее заселения, обогатить обедненное представление о явлениях и событиях отечественной истории
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Temporal logic model of performance in high school = Темпорально-логическая модель деятельности обучаемого в вузе
No full textPavlenko V. N., Tkachenko Y. M. Temporal logic model of performance in high school = Темпорально-логическая модель деятельности обучаемого в вузе. Journal of Education, Health and Sport. 2015;5(7):258-270. ISSN 2391-8306. DOI 10.5281/zenodo.19970
http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%287%29%3A258-270
https://pbn.nauka.gov.pl/works/584328
http://dx.doi.org/10.5281/zenodo.19970
Formerly Journal of Health Sciences. ISSN 1429-9623 / 2300-665X. Archives 2011 – 2014 http://journal.rsw.edu.pl/index.php/JHS/issue/archive
Deklaracja.
Specyfika i zawartość merytoryczna czasopisma nie ulega zmianie.
Zgodnie z informacją MNiSW z dnia 2 czerwca 2014 r., że w roku 2014 nie będzie przeprowadzana ocena czasopism naukowych; czasopismo o zmienionym tytule otrzymuje tyle samo punktów co na wykazie czasopism naukowych z dnia 31 grudnia 2014 r.
The journal has had 5 points in Ministry of Science and Higher Education of Poland parametric evaluation. Part B item 1089. (31.12.2014).
© The Author (s) 2015;
This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland and Radom University in Radom, Poland
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium,
provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License
(http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.
This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial
use, distribution and reproduction in any medium, provided the work is properly cited.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Received: 15.06.2015. Revised 05.07.2015. Accepted: 12.07.2015.
TEMPORAL LOGIC MODEL OF PERFORMANCE IN HIGH SCHOOL
ТЕМПОРАЛЬНО-ЛОГИЧЕСКАЯ МОДЕЛЬ ДЕЯТЕЛЬНОСТИ ОБУЧАЕМОГО В ВУЗЕ
V. N. Pavlenko, Y. M. Tkachenko
В. Н. Павленко, Ю. М. Ткаченко
National Aerospace University «Kharkiv Aviation Institute», Ukraine
Национальный аэрокосмический университет им. Н. Е. Жуковского «ХАИ», Украина
V.N. Pavlenko,
National Aerospace University «Kharkiv Aviation Institute», Ukraine
Chkalova str. 17, Kharkiv, Ukraine, 61070
E-mail: [email protected]
Y.M. Tkachenko,
National Aerospace University «Kharkiv Aviation Institute», Ukraine
Chkalova str. 17, Kharkiv, Ukraine, 61070
E-mail: [email protected]
Abstract: The one of the stages of the approach to the organization of computer decision support to determine the trajectory of training of students in universities, namely the synthesis of model student. For the synthesis of the student model used mathematical apparatus of temporal logic. The form of a software implementation, the student model is representation in the form of an intelligent agent. Further stages of developing a new approach based on the development of the model of the student group as a community of intelligent agents, and on the notion of the learning process of students in the form of multi-agent system. A multi-agent system will be used to support decision-making by different levels (deans, vice-rector for scientific and pedagogical work) in the event of disputes in the learning process of individual students and student groups.
Keywords: student, student group, the trajectory of education, educational process, process model, multi-agent systems, intelligent agents, temporal logic.
Аннотация: изложен один из этапов реализации подхода к организации компьютерной поддержки принятия решений по определению траектории обучения студентов в ВУЗах, а именно синтез модели обучаемого. Для синтеза модели обучаемого использован математический аппарат темпоральной логики. Формой программной реализации модели обучаемого является его представление в виде интеллектуального агента. Дальнейшие этапы разрабатываемого подхода основаны на разработке модели студенческой группы как сообщества интеллектуальных агентов, и на представлении процесса обучения студентов в форме мультиагентной системы. Мультиагентная система будет использоваться для поддержки принятия решений руководителями разных уровней (деканами, проректорами по научно-педагогической работе) при возникновении спорных ситуаций в процессе обучения как отдельных студентов, так и студенческих групп.
Ключевые слова: студент, студенческая группа, траектория обучения, образовательный процесс, процессная модель, мультиагентные системы, интеллектуальные агенты, темпоральная логика.Pavlenko V. N., Tkachenko Y. M. Temporal logic model of performance in high school = Темпорально-логическая модель деятельности обучаемого в вузе. Journal of Education, Health and Sport. 2015;5(7):258-270. ISSN 2391-8306. DOI 10.5281/zenodo.19970
http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%287%29%3A258-270
https://pbn.nauka.gov.pl/works/584328
http://dx.doi.org/10.5281/zenodo.1997
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Static and collective properties of dusty non-equilibrium plasmas
No full textThe static dielectric function and dust acoustic waves are considered of non-equilibrium dusty plasmas. The
dynamic characteristics are considered using an effective potential applicable at elevated pressure, but this is
not a limitation. A three-species model capable of describing the collective processes is suggested, and a first
order phase transition in such systems is previewed. The OCP static characteristics are calculated within the
HNC approach.This work was partially supported by the Russian Foundation for Basic Research (project No. 12-02-01177-a), the President of the Russian Federation (project no. NSh-2447.2012.2 for Support of Leading Scientific Schools) and the Spanish Ministerio de Ciencia e Innovacion (Grant No. ENE2010-21116-C02-02). I. M. T. is also grateful to the UPV for the sabbatical leave he was granted.Filippov, AV.; Starostin, AN.; Tkachenko Gorski, IM.; Fortov, VE. (2013). Static and collective properties of dusty non-equilibrium plasmas. Contributions to Plasma Physics. 53(4-5):442-449. https://doi.org/10.1002/ctpp.201200128S442449534-5Filippov, A. V., Starostin, A. N., Tkachenko, I. M., Fortov, V. E., Ballester, D., & Conde, L. (2010). Dust acoustic waves in a nonequilibrium dusty plasma. JETP Letters, 91(11), 558-565. doi:10.1134/s0021364010110044Filippov, A. V., Starostin, A. N., Tkachenko, I. M., & Fortov, V. E. (2011). Dust acoustic waves in complex plasmas at elevated pressure. Physics Letters A, 376(1), 31-38. doi:10.1016/j.physleta.2011.10.030Adamyan, V. M., & Tkachenko, I. M. (2003). Sum rules and exact relations for quantal Coulomb systems. Contributions to Plasma Physics, 43(56), 252-257. doi:10.1002/ctpp.200310020I. M. Tkachenko Yu. V. Arkhipov A. Askaruly “The Method of Moments and its Applications in Plasma Physics”, Lambert Acad. Publ., Saarbrücken, Germany, 2012.Dolgov, O. V., Kirzhnits, D. A., & Maksimov, E. G. (1981). On an admissible sign of the static dielectric function of matter. Reviews of Modern Physics, 53(1), 81-93. doi:10.1103/revmodphys.53.81Maksimov, E. G., Dolgov, O. V., & Dolgov, O. V. (2007). Physics-Uspekhi, 50(9), 933. doi:10.1070/pu2007v050n09abeh006213M. G. Krein A. A. Nudel'man “The Markov moment problem and extremal problems”, Trans. of Math. Monographs 50 , Amer. Math. Soc., Providence, R. I., 1977.N. I. Akhiezer “The Classical Moment Problem”, Hafner Publishing Company, New York, 1965.A. A. Abrikosov L. P. Gorkov I. E. Dzyaloshinski “Methods of Quantum Field Theory in Statistical Physics”, Pergamon Press, 1965.A. N. Starostin in Proceedings of IXth International Conference on Phenomena in Ionized Gases (Bucharest, 1969), p. 366.Starostin, A. N., Roerich, V. C., & More, R. M. (2003). How correct is the EOS of weakly nonideal hydrogen plasmas? Contributions to Plasma Physics, 43(56), 369-372. doi:10.1002/ctpp.200310048Starostin, A. N., & Roerich, V. C. (2005). A converging equation of state of a weakly nonideal hydrogen plasma without mystery. Journal of Experimental and Theoretical Physics, 100(1), 165-198. doi:10.1134/1.1866208Fasolino, A., Parrinello, M., & Tosi, M. P. (1978). Static dielectric behavior of charged fluids near freezing. Physics Letters A, 66(2), 119-121. doi:10.1016/0375-9601(78)90013-0Ng, K. (1974). Hypernetted chain solutions for the classical one‐component plasma up to Γ=7000. The Journal of Chemical Physics, 61(7), 2680-2689. doi:10.1063/1.1682399Baus, M. (1980). Statistical mechanics of simple coulomb systems. Physics Reports, 59(1), 1-94. doi:10.1016/0370-1573(80)90022-
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