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369 results on '"Hritonenko, Natali"'

60. Using the Escalator Boxcar Train to Determine the Optimal Management of a Size-Distributed Forest When Carbon Sequestration Is Taken into Account

Author

Goetz, Renan, Hritonenko, Natali, Xabadia, Angels, Yatsenko, Yuri, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2008
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80. Existence of measure-valued solutions in optimal control of age-structured populations.

Author

Hritonenko, Natali, Kato, Nobuyuki, and Yatsenko, Yuri

Subjects
*FUNCTIONS of bounded variation, *PROFIT maximization, *HARVESTING time, *HARVESTING
Abstract

We consider a nonlinear profit maximization problem in the Lotka–McKendrick model of age-structured harvested population describing farmed populations in agriculture and aquaculture. The control functions are time- and age-dependent harvesting rate and time dependent supply of newborns. We establish the existence of optimal controls with measure-valued harvesting rate by using distributional partial derivatives of functions of bounded variation through the equivalent integrated form to the original problem. [ABSTRACT FROM AUTHOR]

Published
2023
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94. Model with transmission delays for COVID‐19 control: Theory and empirical assessment.

Author

Hritonenko, Natali, Yatsenko, Olga, and Yatsenko, Yuri

Subjects
COVID-19 pandemic, COVID-19, EPIDEMICS, STAY-at-home orders, PUBLIC health
Abstract

The paper focuses on modeling of public health measures to control the COVID‐19 pandemic. The authors suggest a flexible integral model with distributed lags, which realistically describes COVID‐19 infectiousness period from clinical data. It contains susceptible–infectious–recovered (SIR), susceptible–exposed–infectious–recovered (SEIR), and other epidemic models as special cases. The model is used for assessing how government decisions to lockdown and reopen the economy affect epidemic spread. The authors demonstrate essential differences in transition and asymptotic dynamics of the integral model and the SIR model after lockdown. The provided simulation on real data accurately describes several waves of the COVID‐19 epidemic in the United States and is in good correspondence with government actions to curb the epidemic. [ABSTRACT FROM AUTHOR]

Published
2022
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99. Technological breakthroughs and asset replacement

Author

Yatsenko, Yuri and Hritonenko, Natali

Subjects
Asset-backed securities -- Analysis, Technological innovations -- Analysis, Business, Petroleum, energy and mining industries
Abstract

The authors analyze the optimal replacement of a single asset under continuous and discontinuous technological change. They consider an infinite-horizon replacement problem with a variable asset lifetime. Due to deterioration, maintenance costs increase when the asset becomes older. Because of technological change, both maintenance and new capital costs decrease in time for a fixed asset age. The dynamics of the optimal asset lifetime are studied analytically and numerically in the cases of one and several technological breakthroughs. The breakthroughs cause irregularities (anticipation echoes) in the asset lifetime before the breakthrough time. It is shown that the optimal lifetime is always smaller when new capital costs decrease faster, when the maintenance costs decrease slower, or when both maintenance and new capital costs decrease faster with the same rate., INTRODUCTION The article analyzes the impact of discontinuous technological change (TC) on the optimal replacement of assets (capital equipment, machines). The asset replacement under continuous TC has been intensively analyzed [...]

Published
2009

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