189 research outputs found
Technological wells schemes and location parameters optimization for uranium geotechnology
No full textPattern Analysis in Networks of Diffusively Coupled Lur’e Systems
No full textsponsorship: The author received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 675080. (European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant|675080)status: Publishe
Detect to Focus: Latent-Space Autofocusing System With Decentralized Hierarchical Multi-Agent Reinforcement Learning
No full textState-of-the-art object detection models are frequently trained offline using available datasets, such as ImageNet: large and overly diverse data that are unbalanced and hard to cluster semantically. This kind of training drops the object detection performance should the change in illumination, in the environmental conditions (e.g., rain or dust), or in the lens positioning (out-of-focus blur) occur. We propose a simple way to intelligently control the camera and the lens focusing settings in such scenarios using DASHA, a Decentralized Autofocusing System with Hierarchical Agents. Our agents learn to focus on scenes in challenging environments, significantly enhancing the pattern recognition capacity beyond the popular detection models (YOLO, Faster R-CNN, and Retina are considered). At the same time, the decentralized training allows preserving the equipment from overheating. The algorithm relies on the latent representation of the camera’s stream and, thus, it is the first method to allow a completely no-reference imaging, where the system trains itself to auto-focus itself. The paper introduces a novel method for auto-tuning imaging equipment via hierarchical reinforcement learning. The technique involves the use of two interacting agents which independently manage the camera and lens settings, enabling optimal focus across different lighting situations. The unique aspect of this approach is its dependence on the latent feature vector of the real-time image scene for autofocusing, marking it as the first method of its kind to auto-tune a camera without necessitating reference or calibration data
Detecting coexisting oscillatory patterns in delay coupled Lur‘e systems
No full textThis work addresses the problem of pattern analysis in networks consisting of delay-coupled identical Lur'e systems. We study a class of nonlinear systems, which, being isolated, are globally asymptotically stable. Assembling such systems into a network via time-delayed coupling may result in the change of network equilibrium stability under parameter variation in the coupling. In this work, we focus on cases where a Hopf bifurcation causes the change of stability of the network equilibrium and leads to the occurrence of oscillatory modes (patterns). Moreover, some of these patterns can co-exist for the same set of coupling parameters, which makes the analysis by means of common methods, such as the Lyapunov-Krasovskii method or the analysis of Poincaré maps, cumbersome. A numerically efficient algorithm, aiming at the computation of the oscillatory patterns occurring in such networks, is presented. Moreover, we show that our approach is able to deal with co-existing patterns, and both stable and unstable regimes can be simultaneously computed, which gives deep insight into the network dynamics. In order to illustrate the efficiency of the method, we present two examples in which the instability of the network equilibria is caused by a subcritical and a supercritical Hopf bifurcation. In addition, a bifurcation analysis of the subcritical case is performed in order to further explain the occurrence of the detected coexisting modes.sponsorship: This project received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie Grant Agreement No. 675080. (European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie Grant|675080)status: Published onlin
Економічне стимулювання розвитку підприємств суднобудування України
No full textРогов, В. Г. Економічне стимулювання розвитку підприємств суднобудування України = The economic stimulation of shipbuilding enterprises development in Ukraine : автореф. дис. … канд. екон. наук : 08.00.04 / В. Г. Рогов ; наук. кер. Г. В.Єфімова ; ІПРЕЕД НАН України. – Одеса, 2021. – 24 с.Обґрунтовано теоретичні та вдосконалено методичні положення економічного стимулювання в системі управління розвитком підприємства. Здійснено аналіз тенденцій розвитку суднобудівних підприємств і ефективності формування та використання ними стимулів їх розвитку. Надано рекомендації щодо формування податкових і кредитних стимулів розвитку суднобудівного підприємства на основі балансу суспільних і корпоративних інтересів; запропоновано науково-методичний підхід до створення системи раннього попередження і реагування на зміни економічних стимулів розвитку підприємства за слабкими і сильними сигналами; розроблено методичний підхід до оцінки економічних ризиків реалізації стратегії розвитку підприємства та обґрунтування доцільності застосування альтернативної стратегії в разі істотного впливу стимулів на основі математичного апарату теорії узагальнених нечітких чисел.The thesis provides theoretical generalization and a new solution to the scientific problem of improving theoretical and methodological approaches to shipbuilding enterprise economic stimulation in the institutional environment uncertainty. A modern shipbuilding enterprise is an open system integrated into a corporate diversified structure and maritime complex. Hence, there is a need to study enterprise incentives beyond the industry and take into account interaction with the environment. It has been substantiated that an economic incentive is a factor of the external and internal environment, which systematically affects an enterprise's development through economic relations. It is advisable to interpret economic stimulation as a purposeful process of using factors of the external and internal environment at macroeconomic and microeconomic levels as levers for implementing corporate development strategies and ensuring state, public and corporate interests. This definition takes into account the enterprise interaction with the investment, credit, and insurance markets. The author substantiated the role of shipbuilding enterprise management bodies in stimulating the development, which is to form incentives, use them, and adapt to their changes. Stimulation of a shipbuilding enterprise development in its management system should be carried out using a subsystem of information and analytical support, functions, and a set of management methods. It is proposed to define the adaptation to changes in the development incentives as an active or passive permanent process of enterprise interaction with the external environment and adjustment in order to ensure effective functioning. As a result of studying the development trends of shipbuilding enterprises in Ukraine and the evolution of forms of their economic incentives, the most effective incentives have been identified: the formation of integrated diversified corporate structures, the availability of government orders for the construction of ships and vessels, specialization in the construction of river and naval fleets, tax incentives, and a decrease in loan rates. The author proved that in order to assess the effectiveness of stimulating the development of a shipbuilding enterprise, in particular the formation of integrated corporate structures, it is advisable to choose a business value indicator. Assessment of the impact of economic incentives on the proposed target integral indicator allows us to establish the likelihood of implementing a general corporate strategy. To improve the corporate management system, the author substantiated the incentives for state regulation that are relevant for the shipbuilding enterprise and at the same time possible given the current state of the institutional environment, which correspond to the balance of public and corporate interests. The classification of indicators has been developed for early warning and response to incentives of an enterprise development. Together, they identify and assess the impact of incentives and respond to them on time. The indicators of response to strong and weak signals were determined based on the likelihood of incentives change. Indicators for endogenous and exogenous factors are also singled out. The author proposed information support for identifying weak and strong signals of changing credit and tax incentives. The types of responses to incentive changes in the current and strategic perspective have been identified, including assessing the priority of alternative development strategies, analysis of the feasibility of changing the capital structure, improvement of the program of measures to ensure the creditworthiness and compliance with the conditions for granting automatic refund of value-added tax, the use of accelerated depreciation and alternative sources of financing. Changes in incentives that negatively affect the enterprise's financial condition require the development of response measures, regardless of whether they are offset by some positive changes. The author proposed a methodological approach to assess the economic risks of implementing corporate development strategy and alternative feasibility, in the case of incentives significant effect, based on the mathematical apparatus of the generalized fuzzy numbers theory, the method of expert assessments, and the early warning and response system output information. The expert assessment presents itself in linguistic terms and generalized fuzzy numbers. The next step is to evaluate the strategy implementation risk as a generalized fuzzy number based on the graduated average integration and calculate the degree of similarity. In order to translate the verbal strategy risk assessment into a quantitative one, it is necessary to perform defuzzification that provides an opportunity to decide on the advisability of changing the enterprise development strategy with a sufficient degree of reliability.В диссертации обоснованы теоретические и усовершенствованы методические положения экономического стимулирования в системе управления развитием предприятия. Осуществлен анализ тенденций развития судостроительных предприятий и эффективности формирования и использования ими стимулов их развития. Даны рекомендации по формированию налоговых и кредитных стимулов развития судостроительного предприятия на основе баланса общественных и корпоративных интересов; предложен научно-методический подход к созданию системы раннего предупреждения и реагирования на изменения экономических стимулов развития предприятия по слабым и сильным сигналам; разработан методический подход к оценке экономических рисков реализации стратегии развития предприятия и обоснованию целесообразности применения альтернативной стратегии в случае существенного влияния стимулов на основе математического аппарата теории обобщенных нечетких чисел
A demodex presence in the human skin biopsies / Y. Rogov, Y. Kuzmenka-Maskvina
No full textМедицинская экология: биомедицина, генетика, эпидемиологическая и гигиеническая оценки среды обитания человекаПересмотрены гистологические препараты кожных биопсий человека текущих патологоанатомических исследований, проведенных за последние три года для идентификации клещей Demodex, определения частоты их встречаемости и ассоциации с различными заболеваниями. Структуры паразита выявлялись регулярно в волосяных фолликулах и сальных железах как в интактной коже, так и при различных опухолевых и неопухолевых её поражениях = Histological slides of current human skin biopsies investigated over the past 3 years have been revised to identify Demodex, the frequency of its occurrence and association with different diseases. The mite structures have been determined regularly in hair follicles and sebaceous glands either in intact skin or in various tumor and non-tumor skin lesion
Sesgo tafonómico en los datos de distribución de Cloudina en Siberia
No full textCloudina-morph fossils in Siberia have been traditionally regarded as a taphonomic mode of Anabarites tests inserted one into another under specific hydrodynamic conditions. Clusters of telescoped conical tests are ubiquitous in the Kessyusa Group and coeval strata across Siberia and not all of them can be easily interpreted as a result of simple mechanical stacking. It remains to be confirmed whether any of these clusters actually represents a life association of a Cloudina-morph structure.En Siberia los morfotipos de Cloudina han sido tradicionalmente considerados como una variedad tafonómica de conchas de Anabarites, insertadas una dentro de otra, bajo condiciones hidrodinámicas específicas. Las asociaciones de conchas cónicas telescópicas son omnipresentes en el Grupode Kessyusa y en estratos contemporáneos a lo largo de Siberia, y no todos ellos pueden ser fácilmente interpretados como resultado de un simple apilamiento mecánico. Queda por ver si alguna de estas bioacumulaciones representa una asociación de vida de una estructura morfotípica de tipo Cloudina
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