18 citations · 82 across the 23 of their papers we have counts for
9 papers · 1 filter
Analytical and numerical solutions to ergodic control problems arising in environmental management
Hidekazu Yoshioka, Motoh Tsujimura, Yuta Yaegashi
Environmental management optimizing a long-run objective is an ergodic control problem whose resolution can be achieved by solving an associated non-local Hamilton-Jacobi-Bellman (…
A simple model on streamflow management with a dynamic risk measure
Hidekazu Yoshioka, Yumi Yoshioka
We present an exactly-solvable risk-minimizing stochastic differential game for flood management in rivers. The streamflow dynamics follow stochastic differential equations driven…
HJB and Fokker-Planck equations for river environmental management based on stochastic impulse control with discrete and random observation
H. Yoshioka, M. Tsujimura, K. Hamagami +2
We formulate a new two-variable river environmental restoration problem based on jump stochastic differential equations (SDEs) governing the sediment storage and nuisance benthic a…
A generalized stochastic control problem of bounded noise process under ambiguity arising in biological management
H. Yoshioka, M. Tsujimura
The objectives and contributions of this paper are mathematical and numerical analyses of a stochastic control problem of bounded population dynamics under ambiguity, an important…
Mathematical and computational approaches for stochastic control of river environment and ecology: from fisheries viewpoint
Hidekazu Yoshioka
We present a modern stochastic control framework for dynamic optimization of river environment and ecology. We focus on a fisheries problem in Japan, and show several examples of s…
Stochastic impulse control of non-smooth dynamics with partial observation and execution delay: application to an environmental restoration problem
Hidekazu Yoshioka, Yuta Yaegashi
Non-smooth dynamics driven by stochastic disturbance arise in a wide variety of engineering problems. Impulsive interventions are often employed to control stochastic systems; howe…
River environmental restoration based on random observations of a non-smooth stochastic dynamical system
Hidekazu Yoshioka
Earth and soils are indispensable elements of river environment. Dam-downstream environment and ecosystems have been severely affected by reduced or even stopped sediment supply fr…
A random observation-based management model of population dynamics and its ecological application
Hidekazu Yoshioka, Yuta Yaegashi, Motoh Tsujimura
A new stochastic control problem of population dynamics under partial observation is formulated and analyzed both mathematically and numerically, with an emphasis on environmental…
Regime-switching constrained viscosity solutions approach for controlling dam-reservoir systems
H. Yoshioka, Y. Yoshioka
A new stochastic control problem of a dam-reservoir system installed in a river is analyzed both mathematically and numerically. Water balance dynamics of the reservoir are piece-w…