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Potential Distribution of Seagrass Meadows Based on the MaxEnt Model in Chinese Coastal Waters

Journal of Ocean University of China 2022年第5期21卷 1351-1361页

作者： WANG Ming WANG Yong LIU Guangliang CHEN Yuhu YU Naijing Center for High Performance Computing and System Simulation Pilot National Laboratory for Marine Science and TechnologyQingdao 266200China Shandong Provincial Key Laboratory of Computer Networks Qilu University of Technology(Shandong Academy of Sciences)Jinan 250101China

Seagrass meadows are generally diverse in China and have become important ecosystem with essential ***,the seagrass distribution across the seawaters of China has not been evaluated,and the magnitude and direction of changes in seagrass meadows remain *** study aimed to provide a nationwide seagrass distribution map and explore the dynamic changes in seagrass population under global climate *** studies were performed using the modeling software MaxEnt with 58961 occurrence records and 27 marine environmental variables to predict the potential distribution of seagrasses and calculate the *** environmental variables were excluded from the modeling processes based on a correlation analysis to ensure predicted *** predicted area was 790.09 km^(2),which is much larger than the known seagrass distribution in China(87.65 km^(2)).By 2100,the suitable habitat of seagrass will shift northwest and increase to 923.62 *** of the sum of the individual family under-pre-dicted the national distribution of seagrasses and consistently showed a downward trend in the *** of all environmental vari-ables,physical parameters(e.g.,depth,land distance,and sea surface temperature)contributed the most in predicting seagrass distri-butions,and nutrients(e.g.,nitrate,phosphate)ranked among the key influential predictors for habitat suitability in our study *** study is the first effort to fill a gap in understanding the distribution of seagrasses in *** studies using modeling and biological/ecological approaches are warranted.

关键词： seagrass meadows species distribution modeling global climate change Chinese coastal waters

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Neural network as a function approximator and its application in solving differential equations

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Applied Mathematics and Mechanics(English Edition) 2019年第2期40卷 237-248页

作者： Zeyu LIU Yantao YANG Qingdong CAI State Key Laboratory for Turbulence and Complex System Peking University Department of Mechanics and Engineering Science College of EngineeringPeking University Center for Applied Physics and Technology College of EngineeringPeking University

A neural network(NN) is a powerful tool for approximating bounded continuous functions in machine learning. The NN provides a framework for numerically solving ordinary differential equations(ODEs) and partial differential equations(PDEs)combined with the automatic differentiation(AD) technique. In this work, we explore the use of NN for the function approximation and propose a universal solver for ODEs and PDEs. The solver is tested for initial value problems and boundary value problems of ODEs, and the results exhibit high accuracy for not only the unknown functions but also their derivatives. The same strategy can be used to construct a PDE solver based on collocation points instead of a mesh, which is tested with the Burgers equation and the heat equation(i.e., the Laplace equation).

关键词： neural network(NN) function approximation ordinary differential equation(ODE)solver partial differential equation(PDE)solver

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Three-dimensional detonation cellular structures in rectangular ducts using an improved CESE scheme

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Chinese Physics B 2016年第11期25卷 369-377页

作者：沈洋申华刘凯欣陈璞张德良 State Key Laboratory for Turbulence and Complex System College of Engineering Peking University Department of Applied Mathematics and Computational Science King Abdullah University of Science and Technology State Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of Sciences

The three-dimensional premixed H2-O2 detonation propagation in rectangular ducts is simulated using an in-house parallel detonation code based on the second-order space-time conservation element and solution element（CE/SE） *** simulation reproduces three typical cellular structures by setting appropriate cross-sectional size and initial perturbation in square *** the cross-sectional size decreases,critical cellular structures transforming the rectangular or diagonal mode into the spinning mode are obtained and discussed in the perspective of phase variation as well as decreasing of triple point ***,multiple cellular structures are observed through examples with typical aspect *** the visualization of detailed three-dimensional structures,their formation mechanism is further analyzed.

关键词： detonation perturbation rectangular diagonal visualization sectional conservation triple walls initially

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Analysis of Damage Effect of Explosion Shock Wave on Armored Vehicle Tracks 3

Analysis of Damage Effect of Explosion Shock Wave on Armored...

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3rd International Conference on Machine Learning and Computer Application, ICMLCA 2022

作者： Zhang, Dongjiang Zhang, Wei Hou, Yunhui Pan, Jian Guo, Xuncheng Qi, Qiong Wang, Youliang Institute of Modern Control Technology Xian China Science and Technology on Complex Aviation Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781510664814

In order to study the damage characteristics of typical armored vehicle track under shock wave load, the finite element software LS-DYNA was used to simulate the process of shock wave damage to typical armored vehicle track. Eight simulation conditions were set up to obtain the influence rules of explosion conditions and track structure on shock wave damage, and the influence of explosive charge, explosive distance and track structure on damage effect was analyzed. The results showed that when the explosive charge exploded on the track side, the track deformation and fracture occurred at the position corresponding to the explosion center level, and the damage degree of shock wave to track changed with the explosive charge and track length. © 2023 SPIE.

关键词： Shock waves

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Multi-View Subspace Clustering Via Simultaneously Cycle Projection and Similarity Learning 21

Multi-View Subspace Clustering Via Simultaneously Cycle Proj...

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21st International Computer Conference on Wavelet Active Media technology and Information Processing, ICCWAMTIP 2024

作者： Tao, Xiang Jie, Liu Wenshen, Qiao Siying, Xiao Mao, Ye Southwest China Institute of Electronic Technology National Key Laboratory of Complex Aviation System Simulation Chengdu610036 China University of Electronic Science and Technology of China Chengdu611731 China

ISBN: (纸本)9798331519254

At present, most of the existing methods combine the data from different views mechanically to obtain the latent subspace with complementary information, which not only fails to make full use of the data information from specific perspectives but also brings redundancy. Therefore, we propose a novel multi-view subspace clustering method. It utilizes cycle projection to obtain a subspace construction model. At the same time, by learning the global structure and local manifold structure of this subspace while assigning learnable weights to different views, the consensus information among views and specific information from different views are captured according to the importance of different views. In this way, our method effectively reduces the original noise and redundancy, and further carries out the improvement of complementarity and consistency among views. The proposed method is optimized by using the Augmented Lagrangian Multiplier with Alternating Direction Minimization (ALM- ADM) algorithm. Experiment results on benchmark datasets confirm the effectiveness of our method. © 2024 IEEE.

关键词： Contrastive Learning

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The simulation of cluster bombs’ damage efficiency and analysis of damage factor

The simulation of cluster bombs’ damage efficiency and anal...

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International Conference on Future Communication technology and Engineering, FCTE 2014

作者： Liu, S. Zhao, X.J. Zhao, F. Wei, X. Li, W.F. Science and Technology on Complex Land Systems Simulation Laboratory Beijing China Chinese Defense Science and Technology Information Centre Beijing China

ISBN: (纸本)9781138027770

First, the paper emulated cluster bombs’random point of fall, the radius of damage of the bombs, drew the bombs’ damage range, and counted the damage effect. The final damage efficiency of cluster bombs was calculated and the influence from each damage factor of the cluster bombswas studied through many random experiences. The method solved the tough problem of the precise calculation of damage efficiency, which was caused by the overlapped damage size. © 2015 Taylor & Francis Group, London.

关键词： Efficiency

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A Many-Objective Algorithm with Threshold Elite Selection Strategy 11th

A Many-Objective Algorithm with Threshold Elite Selection St...

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11th International Symposium on Intelligence Computation and Applications, ISICA 2019

作者： Geng, Shaojin Wu, Di Wang, Penghong Cai, Xingjuan Complex System and Computational Intelligence Laboratory Taiyuan University of Science and Technology Taiyuan China

ISBN: (纸本)9789811555763

The study of many-objective evolutionary algorithm (MaOEA) has become particularly important, especially with the increasing complex engineering optimization problems. Considering that the convergence and diversity of the population are two important indicators to measure the performance of the algorithm, a many-objective evolutionary algorithm with threshold elite selection strategy (MaOEA-TES) are proposed in this paper. The algorithm adopts the balanceable fitness estimation strategy and the reference-point based non-dominated sorting strategy to balance the convergence and diversity of the solution. An adaptive penalty distance boundary intersection strategy is designed to dynamically adjust the impact of convergence and diversity on the algorithm. In addition, a dynamic threshold selection strategy is proposed to ensure that the algorithm emphasizes diversity at an early stage, emphasizes convergence at a later stage, and ensures that the result is closer to the real non-dominant front. The DTLZ test suite is used to evaluate the performance of MaOEA-TES. The experimental results show that the MaOEA-TES has the best performance comparing with three other state-of-the-art algorithms on many-objective optimization. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Evolutionary algorithms

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Static Unstable STT Overload Control on High-order Fully Actuated system Theory 6

Static Unstable STT Overload Control on High-order Fully Act...

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6th International Symposium on Autonomous systems, ISAS 2023

作者： Liu, Xinyu Hao, Mingrui Zhen, Yan Fan, Yu Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9798350316155

This article proposes a joint overload controller for pitch and yaw channels on the high-order fully actuated system theory for a nonlinear lateral and longitudinal static unstable STT aircraft model. Firstly, a second-order fully actuated system model for aircraft overload was derived, and an optimal control method for lateral and longitudinal overload was designed. Through mathematical simulation verification of this controller and traditional PID controller, it is shown that the PID control method has significant shortcomings in nonlinear aircraft with coupling. However, high-order fully actuated system theory control method can better adapt to nonlinear and static instability problems, achieve stable tracking of aircraft overload commands, and have better rapidity. © 2023 IEEE.

关键词： system theory

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The way to analysis of spatial association

The way to analysis of spatial association

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2013 International Conference on Vehicle and Mechanical Engineering and Information technology, VMEIT 2013

作者： Guo, Jing Liu, De Sheng Guo, Qin Science and Technology on Complex Electronic System Simulation Laboratory The Academy of Equipment Huairou Beijing China School of Humanities and Social Sciences National University of Defense Technology Changsha Hunan China

ISBN: (纸本)9783037858202

Following the continual development and maturation of the technology of association analysis, it can be used to mine the relation between spatial data. The paper introduced definition and classification of association analysis technology. It analyses the spatial Association from physics layer, link layer and act layer. Based on above, it provides the process of association analysis about spatial data. © (2013) Trans Tech Publications, Switzerland.

关键词： Data mining

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Review of Formation Control and Cooperative Guidance technology of Multiple Unmanned Aerial Vehicles

Review of Formation Control and Cooperative Guidance Technol...

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International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Liu, Xinyu Hao, Mingrui Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9789811966125

Aiming at the research status of formation control and cooperative guidance technology of multi unmanned aircrafts, this paper introduces various methods of formation control technology and cooperative guidance technology. It also expounds the characteristics of formation control methods such as graph theory, leader-follower formation, behavior strategy, virtual structure, artificial potential field mode and consistency mode, as well as independent, centralized and distributed cooperative guidance methods. Then the application status and technical development of intelligent methods in multi vehicles formation control and cooperative guidance are introduced. At the same time, this paper compares the advantages and problems of various methods, and prospects the future development direction of this field. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Graph theory

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