HiQ: A Hierarchical Q-Learning Algorithm to Solve the Reader Collision Problem

This paper presents a Reinforcement Learning (RL) approach to optimize the long-term scheduling of maintenance for an aircraft fleet. The problem considers fleet status, maintenance capacity, and other maintenance constraints to schedule hangar checks for a specified time horizon. The checks are scheduled within an interval, and the goal is to, schedule them as close as possible to their due date. In doing so, the number of checks is reduced, and the fleet availability increases. A Deep Q-learning algorithm is used to optimize the scheduling policy. The model is validated in a real scenario using maintenance data from 45 aircraft. The maintenance plan that is generated with our approach is compared with a previous study, which presented a Dynamic Programming (DP) based approach and airline estimations for the same period. The results show a reduction in the number of checks scheduled, which indicates the potential of RL in solving this problem. The adaptability of RL is also tested by introducing small disturbances in the initial conditions. After training the model with these simulated scenarios, the results show the robustness of the RL approach and its ability to generate efficient maintenance plans in only a few seconds.

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Research on Optimal Strategy of Peak-shaving of Photovoltaic Grid-connected System Based on Simulated Annealing-Q Learning Algorithm

Journal of Physics Conference Series ◽

10.1088/1742-6596/1871/1/012112 ◽

2021 ◽

Vol 1871 (1) ◽

pp. 012112

Author(s):

Xu Jun ◽

Chen Jinhui ◽

Zhang Zhe

Keyword(s):

Simulated Annealing ◽

Optimal Strategy ◽

Learning Algorithm ◽

Peak Shaving ◽

Q Learning

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Improved Q-Learning Algorithm Based on Approximate State Matching in Agricultural Plant Protection Environment

Entropy ◽

10.3390/e23060737 ◽

2021 ◽

Vol 23 (6) ◽

pp. 737

Author(s):

Fengjie Sun ◽

Xianchang Wang ◽

Rui Zhang

Keyword(s):

Decision Making ◽

Reinforcement Learning ◽

Optimal Policy ◽

Feasible Solution ◽

Learning Algorithm ◽

Plant Protection ◽

Agricultural Plant ◽

Q Learning ◽

Aerial Vehicle ◽

Optimal Action

An Unmanned Aerial Vehicle (UAV) can greatly reduce manpower in the agricultural plant protection such as watering, sowing, and pesticide spraying. It is essential to develop a Decision-making Support System (DSS) for UAVs to help them choose the correct action in states according to the policy. In an unknown environment, the method of formulating rules for UAVs to help them choose actions is not applicable, and it is a feasible solution to obtain the optimal policy through reinforcement learning. However, experiments show that the existing reinforcement learning algorithms cannot get the optimal policy for a UAV in the agricultural plant protection environment. In this work we propose an improved Q-learning algorithm based on similar state matching, and we prove theoretically that there has a greater probability for UAV choosing the optimal action according to the policy learned by the algorithm we proposed than the classic Q-learning algorithm in the agricultural plant protection environment. This proposed algorithm is implemented and tested on datasets that are evenly distributed based on real UAV parameters and real farm information. The performance evaluation of the algorithm is discussed in detail. Experimental results show that the algorithm we proposed can efficiently learn the optimal policy for UAVs in the agricultural plant protection environment.

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