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Hamiltonian boundary value methods applied to KdV-KdV systems

Applied Numerical Mathematics 2025年 214卷 1-27页

作者： Luo, Qian Xiao, Aiguo Luo, Xuqiong Yan, Xiaoqiang School of Mathematics and Computational Science Hunan Key Laboratory for Computation and Simulation in Science and Engineering Xiangtan University Hunan 411105 China Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education Hunan 411105 China School of Mathematics and Statistics Changsha University of Science and Technology Changsha410114 China National Center for Applied Mathematics in Hunan Xiangtan University Hunan 411105 China

In this paper, we propose a highly accurate scheme for two KdV systems of the Boussinesq type under periodic boundary conditions. The proposed scheme combines the Fourier-Galerkin method for spatial discretization with Hamiltonian boundary value methods for time integration, ensuring the conservation of discrete mass and energy. By expanding the system in Fourier series, the equations are firstly transformed into Hamiltonian form, preserving the original Hamiltonian structure. Applying the Fourier-Galerkin method for semi-discretization in space, we obtain a large-scale system of Hamiltonian ordinary differential equations, which is then solved using a class of energy-conserving Runge-Kutta methods, known as Hamiltonian boundary value methods. The efficiency of this approach is assessed, and several numerical examples are provided to demonstrate the effectiveness of the method. © 2025 IMACS

关键词： Ordinary differential equations

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A bionic concentric honeycomb with synergetic enhancement mechanism

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Thin-Walled Structures 2025年 214卷

作者： Wang, Yihao Ren, Yiru Jiang, Hongyong State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Hunan Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Hunan Changsha410082 China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Hunan Changsha410082 China School of Mechanical Engineering and Electronic Information China University of Geosciences Hubei Wuhan430074 China

Inspired by the ‘concentric walls’ in the microstructure of coconut trees, a novel concentric honeycomb is proposed to improve energy absorption. A connected configuration (Double cell) and a gradient arrangement strategy (Triple cell) are introduced in the conventional honeycomb. All structures are prepared by 3D printing and their compression and impact properties are investigated experimentally and simulated. Multiple failure modes under different loads are revealed. Compared with traditional honeycomb, the energy absorption values of C-II-T and C-II-T+L are 183 % and 152 % higher, and the specific energy absorption values are 57 % and 43 % higher, respectively. The energy absorption and specific energy absorption values of G-III-3 are 193 % and 71 % higher, respectively. Synergistic deformation is still effective in improving energy dissipation by more than one-third between concentric honeycombs (C-II-T vs. C-II-L). The results indicate that the synergistic deformation mechanism can effectively exert the enhancement effect of concentric honeycomb. It represents a synergistic enhancement mechanism rather than individual deformation. Furthermore, a controllable mechanical response law of the concentric honeycomb is established to achieve a controllable design. This novel conceptual and structural design approach provides insights into the controllable mechanical design of honeycombs. © 2025 Elsevier Ltd

关键词： Honeycomb structures

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Architecture and application study on internet of things

Architecture and application study on internet of things

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4th International Conference on logistics and Supply Chain Management, LSCM 2012

作者： Hanjiang, Zhang Fanfan, Cheng Yanli, Wei Key Laboratory of Hunan Province Logistics Information and Simulation Technology China

ISBN: (纸本)9781627481298

Internet of Things'development and universal application is the new trend of economic globalization and supply chain competition. In this paper, through the analysis on the Internet of Things and its key technology discussion, summarized the proposed three-tier architecture of it, discusses the structure and function of the RFID system, analyzes the development of industry chain things networking, points out that the typical application of networking, including supply chain management, supermarket chain management, and the business process reengineering and performance to improve the value.

关键词： Supply chain management

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technology and advertisement investment decisions in closed-loop supply chain 7

Technology and advertisement investment decisions in closed-...

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7th International Conference on logistics and Systems Engineering 2017

作者： Guo, Xiuyuan Li, Wei Yuelu District Changsha Hunan Province410082 China Hunan Key Laboratory of Logistics Information and Simulation Technology Hunan Changsha410079 China

ISBN: (纸本)9781921712623

The closed-loop supply chain (CLSC) that includes new technology for remanufacturing and recycling waste products is a hot topic. In this paper, we formulate a two-pried model. In the first stage, the original equipment manufacturer (OEM) produces new products and a retailer sells new products to the market, which means that there is only new product of the market in the first stage. In the second phase, the third party remanufacturer (TPR) uses the waste products to produce the remanufactured goods, and the retailer sells both new and remanufactured products. In the process, OEM invests in advertising to promote new goods consumption, and TPR invests in 3D Printing (3DP) technology to promote products remanufacturing, moreover, both of them share the extra costs with retailer. © 2017 Aussino Academic Publishing House. All rights reserved.

关键词： Supply chains

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Research on price decision of 3D printing crafts 8

Research on price decision of 3D printing crafts

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8th International Conference on logistics and Systems Engineering 2018

作者： Liang, Renzhi Li, Wei Zhao, Shuo School of Economics and Trade Hunan University Hunan Changsha410079 China Hunan Key Laboratory of Logistics Information and Simulation Technology Hunan Changsha410079 China

ISBN: (纸本)9781921712685

3D printing technology has played a significant role in the transformation and upgrading of China's manufacturing industry,and it also has helped to regulate Chinese industrial structure,which became a new energy of Chinese economy's growing and pushed its mode of production to *** in the field of technology has led to continuing expansion of application of 3D printing and turning to *** from medical,Prototype model etc field to our daily life,which benefits our technologies and *** to the particularity of 3D printing products,its product pricing is becoming an issue which is worth to be *** firstly do a simple introduction about situations,trend,and features of 3D printing technology in our ***,we take features of 3D printing technology into consideration and analyze factors which influence price of the product,and set up a price decision model of 3D printing product .The model provide a basis for price decision of 3D printing product,which helps relevant enterprises to establish reasonable product price and marketing strategy. © 2019 Proceedings of the 8th International Conference on logistics and Systems Engineering 2018. All rights reserved.

关键词： 3D printers

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Overconfidence impacts on closed-loop supply chain decisions 7

Overconfidence impacts on closed-loop supply chain decisions

引用

7th International Conference on logistics and Systems Engineering 2017

作者： Tong, Meng Sun, Ziqing Li, Wei School of Economics and Trade Hunan University Changsha410079 China Hunan Key Laboratory of Logistics Information and Simulation Technology Changsha410079 China

ISBN: (纸本)9781921712623

We investigate the impact of manufacturer and remanufacturer's overconfidence on closed-loop supply chain members' decisions. Based on the phenomenon that manufacturer and remanufacturer are overconfident when they forecast the products demands, we set products demand functions with two kinds of overconfidence, which are overestimation and overplacement. Then we build a game theory model on closed-loop supply chain consisting of a manufacturer, remanufacturer and collector. Through the solutions of the closed-loop supply chain members' optimal decision-making when they make decisions simultaneously, we analyze the influences of manufacturer and remanufacturer's overconfidence on optimal prices, quantity of products, profits and recycling rate. The conclusions show that the members don't have optimal profits when manufacturer and remanufacturer are rational. The manufacturer and remanufacturer's profits will increase when they have certain level of overconfidence. The collector's profit will rise as the increase of manufacturer's overconfidence, and will decrease as the increase of remanufacturer's overconfidence. © 2017 Aussino Academic Publishing House. All rights reserved.

关键词： Supply chains

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Vehicle routing problem with simultaneous delivery and pick-up with time windows

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International Conference on Transportation Engineering 2007, ICTE 2007

作者： Cao, Er-Bao Lai, Ming-Yong College of Economics and Trade Hunan University Changsha 410079 Hunan Province Laboratory of Logistics Information and Simulation Technology Changsha 410079

ISBN: (纸本)9780784409329

The vehicle routing problem with simultaneous delivery and pick-up with time windows (VRP-SDPTW) is a variant of the classical vehicle routing problem (VRP) where clients require simultaneous delivery and pick-up service within the time windows. Deliveries are supplied from a single depot at the beginning of the vehicle's service, while pick-up loads are taken to the same depot at the conclusion of the service. One important characteristic of this problem is that a vehicle's load in any given route is a mix of delivery and pick-up loads, at the same time in any route the vehicle can not violate some constraints, such as: the vehicle capacity time windows and traveling distance constraints. VRP-SDPTW as an extension for vehicle routing problem, which is a complex combinational optimization problem, and is a well know non-polynomial hard (NP-hard) Problem. In this paper, VRP-SDPTW is presented from the point of strategic view that combines the logistics and reverse logistics (bidirectional logistics). We constructed a universal mix integer programming mathematic model of VRP-SDPTW in detail, which can transform into other typical combination optimal problems by setting different parameters. An improved genetic algorithm (IGA) is proposed based on the novel crossover-operator to solve the problem. In operation process, we firstly adopted the novel decimal coding according to a priori sequence among all customers, which consider effectively the vehicle capacity time windows and traveling distance restrictions at the same time. And then a novel crossover-operator is designed. The improved genetic algorithm (IGA) avoids effectively the common defects of early convergence and the diversity of population in traditional genetic algorithm. The experiment result shows that this algorithm can find the optimal or near-optimum solution to VRP-SDPTW effectively. Copyright ASCE 2007.

关键词： Vehicle routing

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The logistics vehicle routing and supervision system

引用

International Conference on Transportation Engineering 2007, ICTE 2007

作者： Qu, Xiaoxiang Lai, Mingyong Nie, Kai Cao, Erbao College of Economics and Trade Hunan University Changsha 410079 Hunan Province Laboratory of Logistics Information and Simulation Technology Changsha 410079

ISBN: (纸本)9780784409329

The logistics vehicle routing and supervision system was investigated in this paper. The current development of modern logistics and me relevant facts were discussed firstly. Based on the analysis of demand of distribution vehicle routing and supervision system, some key techniques in developing distribution vehicle routing and monitor system, such as GIS development technology and vehicle routing optimization technology were analyzed then. The authors suggested the module design of soft system function and the ways of hardware integration, as well as software development. The obtained result is of great importance to the safety of delivering goods and accuracy of logistics routing. It is also valuable for the improvement of service quality and work efficiency in the logistics business. Copyright ASCE 2007.

关键词： Vehicle routing

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An improved TSP model based on stranger problem in logistics distribution

引用

International Conference on Transportation Engineering 2007, ICTE 2007

作者： Kai, Nie Yong, Lai Ming Wei, Li Bao, Cao Er College of Economics and Trade Hunan University Changsha 410082 Hunan Province Laboratory of Logistics Information and Simulation Technology Changsha 410079

ISBN: (纸本)9780784409329

In researches of many experts and scholars, TSP is widely used in reducing the cost of logistics distribution. However in practice, most ripe models and algorithms can not achieve expected goals, and one important reason is that the models and algorithms do not consider the "Stranger Problem" in logistics distribution. This paper describes the "Stranger Problem", and establishes an improved TSP model based on "Stranger Problem" by defining two parameters named "Strange Degree" and "Strange Coefficient". At last this paper improves C-W algorithms based me improved model, and the computational results are compared with the results based common model. The comparison proves the feasibility and efficiency of the improved model. Copyright ASCE 2007.

关键词： logistics

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Research on logistics outsourcing cooperative game based on logistics functional cost under asymmetric information

Research on logistics outsourcing cooperative game based on ...

引用

8th International Conference of Chinese logistics and Transportation Professionals - logistics: The Emerging Frontiers of Transportation and Development in China

作者： Li, Wei Lai, Ming-Yong Zeng, Guang-Ming Nie, Kai College of Economic and Trade Hunan University Hunan 410079 China Hunan Key Laboratory of Logistics Information and Simulation Technology Hunan 410079 China College of Environmental Science and Engineering Hunan University Hunan 410082 China

ISBN: (纸本)9780784409961

This paper researched the cooperating game in logistics outsourcing under asymmetric information. It set up the cooperative game model in condition of TPL buyer can not observe the TPL logistics operation cost and management cost, and apply maximum principle and principal-agent theory to obtain both the players' cooperative strategies. Finally, assuming the agent is risk-neutral, the authors analyzed the risk cost, incentive cost and total agency cost of TPL buyers. © ASCE.

关键词： Outsourcing

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