15 citations · 45 across the 14 of their papers we have counts for
8 papers · 1 filter
Distributionally robust decision-making under ambiguity: case study of water environmental management
Hidekazu Yoshioka, Motoh Tsujimura, Yumi Yoshioka +1
Decision-making under uncertainty is ubiquitous in environmental project planning. Environmental processes such as a streamflow discharge often present a subexponential memory, whe…
Mathematical model for sustainable fisheries resource management accounting for size spectrum
Hidekazu Yoshioka, Yumi Yoshioka, Motoh Tsujimura +1
This paper proposes a novel modelling and control framework for growth models that incorporate a size spectrum in conjunction with numerical computation and extensive field surveys…
Assessing fluctuations of long-memory environmental variables based on the robustified dynamic Orlicz risk
Hidekazu Yoshioka, Yumi Yoshioka
Environmental variables that fluctuate randomly and dynamically over time, such as water quality indices, are considered to be stochastic. They exhibit sub-exponential memory struc…
Stochastic optimization of a mixed moving average process for controlling non-Markovian streamflow environments
Hidekazu Yoshioka, Tomohiro Tanaka, Yumi Yoshioka +1
We investigated a cost-constrained static ergodic control problem of the variance of measure-valued affine processes and its application in streamflow management. The controlled sy…
Modeling and computation of an integral operator Riccati equation for an infinite-dimensional stochastic differential equation governing streamflow discharge
Hidekazu Yoshioka, Motoh Tsujimura, Tomohiro Tanaka +2
We propose a linear-quadratic (LQ) control problem of streamflow discharge by optimizing an infinite-dimensional jump-driven stochastic differential equation (SDE). Our SDE is a su…
Impulsive fishery resource transporting strategies based on an open-ended stochastic growth model having a latent variable
Hidekazu Yoshioka, Tomomi Tanaka, Futoshi Aranishi +2
In inland fisheries, transporting fishery resource individuals from a habitat to spatially apart habitat(s) has recently been considered for fisheries stock management in the natur…
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…