This paper is concerned with the cooperative target stalking for a multi-unmanned surface vehicle(multi-USV)*** on the multi-agent deep deterministic policy gradient(MADDPG)algorithm,a multi-USV target stalking(MUTS)a...
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This paper is concerned with the cooperative target stalking for a multi-unmanned surface vehicle(multi-USV)*** on the multi-agent deep deterministic policy gradient(MADDPG)algorithm,a multi-USV target stalking(MUTS)algorithm is ***,a V-type probabilistic data extraction method is proposed for the first time to overcome shortcomings of the MADDPG *** advantages of the proposed method are twofold:1)it can reduce the amount of data and shorten training time;2)it can filter out more important data in the experience buffer for ***,in order to avoid the collisions of USVs during the stalking process,an action constraint method called Safe DDPG is ***,the MUTS algorithm and some existing algorithms are compared in cooperative target stalking *** order to demonstrate the effectiveness of the proposed MUTS algorithm in stalking tasks,mission operating scenarios and reward functions are well designed in this *** proposed MUTS algorithm can help the multi-USV system avoid internal collisions during the mission ***,compared with some existing algorithms,the newly proposed one can provide a higher convergence speed and a narrower convergence domain.
In many production fields such as chemical, food, fertilizers, cement, etc., products are usually shipped in bags and stacked on pallets in warehouses for sale and transportation. Currently, long-distance transportati...
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This paper aims to conduct a comprehensive exergoeconomic analysis of a novel zero-carbon-emission multi-generation system and propose a fast optimization method combined with machine *** detailed exergoeconomic analy...
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This paper aims to conduct a comprehensive exergoeconomic analysis of a novel zero-carbon-emission multi-generation system and propose a fast optimization method combined with machine *** detailed exergoeconomic analysis of a novel combined power,freshwater and cooling multi-generation system is performed in this *** exergoeconomic analysis model is established by exergy flow theory.A comprehensive exergy,exergoeconomic and environmental analysis is carried *** critical decision variables are researched to bring out effects on the multi-generation system exergoeconomic performance.A novel fast optimization method combining genetic algorithm and Bagging neural network is *** advanced nature comparison is made between the proposed system and four similar *** display that increasing the turbine inlet temperature can improve exergy efficiency and decrease the total product unit *** multi-generation system exergy destruction directly determines exergy efficiency and total exergy destruction cost *** total product unit cost in the cost optimal design case is reduced by 7.7%and 25%,respectively,compared with exergy efficiency optimal design case and basic design *** with four similar cases,the proposed multi-generation system has great advantages in thermodynamic performance and exergoeconomic *** paper can provide research methods and ideas for performance analysis and fast optimization of multi-generation system.
This paper is concerned with the problem of attack detection for unmanned marine vehicles (UMV) suffering from replay attacks. With the openness of the communication network, replay attacks occur at a higher rate and ...
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This paper is concerned with the problem of attack detection for unmanned marine vehicles (UMV) suffering from replay attacks. With the openness of the communication network, replay attacks occur at a higher rate and can cause severe impacts on UMV. Therefore, it is of great significance to detect replay attacks promptly and efficiently. To this end, an attack detection scheme based on watermark signals is proposed. Firstly, a Takagi-Sugeno (T-S) fuzzy system model for the UMV are established. Then, encoded and decoded signals based on the watermark signal are constructed, which are added to terminals of the sensors and the state estimators to detect replay attacks. The signals can effectively affect the residual values of the system when it is under attack, thus enabling the detection of replay attacks. Moreover, the method contributes to less system performance loss is demonstrated. Finally, the simulation results verify the effectiveness of this scheme. IEEE
Materials for deep-ultraviolet(DUV)light emission are extremely rare,significantly limiting the development of efficient DUV light-emitting *** we report CsMg(I_(1−x)Br_(x))_(3) alloys as potential DUV light *** on ri...
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Materials for deep-ultraviolet(DUV)light emission are extremely rare,significantly limiting the development of efficient DUV light-emitting *** we report CsMg(I_(1−x)Br_(x))_(3) alloys as potential DUV light *** on rigorous first-principles hybrid functional calculations,we find that CsMgI_(3) has an indirect bandgap,while CsMgBr_(3) has a direct ***,we employ a band unfolding technique for alloy supercell calculations to investigate the critical Br concentration in CsMg(I_(1−x)Br_(x))_(3) associated with the crossover from an indirect to a direct bandgap,which is found to be∼***,CsMg(I_(1−x)Br_(x))_(3) alloys with 0.366≤6≤1 cover a wide range of direct bandgap(4.38–5.37 eV;284–231 nm),falling well into the DUV *** study will guide the development of efficient DUV light emitters.
To improve the defense capability of military equipment under extreme conditions,impact-resistant and high-energy-consuming materials have to be *** damping characteristic of entangled porous metallic wire materials(E...
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To improve the defense capability of military equipment under extreme conditions,impact-resistant and high-energy-consuming materials have to be *** damping characteristic of entangled porous metallic wire materials(EPMWM)for vibration isolation was previously *** this paper,a study focusing on the impact-resistance of EPMWM with the consideration of ambient temperature is *** quasi-static and low-velocity impact mechanical behavior of EPMWM under different temperatures(25℃-300℃)are systematically *** results of the static compression test show that the damping energy dissipation of EPMWM increases with temperature while the nonlinear damping characteristics are gradually *** the impact experiments,the impact energy loss rate of EPMWM was between 65%and 85%,while the temperatures increased from 25℃to 300℃.Moreover,under the same drop impact conditions,the overall deformation of EPMWM decreases in the temperature range of 100℃-200℃.On the other hand,the impact stiffness,energy dissipation,and impact loss factor of EPMWM significantly increase with *** can be attributed to an increase in temperature,which changes the thermal expansion coefficient and contact state of the internal wire ***,the energy dissipation mode(dry friction,air damping,and plastic deformation)of EPMWM is also ***,the EPMWM may act as a potential candidate material for superior energy absorption applications.
Imaging sonars are essential for underwater robotic perception, providing imagery at extended distances beyond the capabilities of standard optical cameras. Despite the success in 3D reconstruction using the Neural Ra...
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The magnetostriction and magnetization of Fe-Ga alloy (Galfenol) rods were modeled according to the free energy theory, the JA model and the SW model, taking into account anisotropy effect and loss effect. The magneto...
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This article is about the study of ultrasonic propagation under different densities in mud environment. In recent years, with the rapid development of energy metering, ultrasonic is more and more widely used in this i...
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This paper proposes a pan-tilt-zoom (PTZ) gesture teleoperation method based on the Kalman Filter. By mapping the changes in the pitch angle and yaw angle of the hand obtained by Leapmotion to the desired angle of the...
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