Duanfeng Liu

Entangled qutrit states from simple graphs

慧 何, Duanfeng Liu, Zenan Ye, Zhiwei Sun

Abstract This paper presents a theoretical framework for generating and controlling high-dimensional quantum entanglement by harnessing the scattering properties of quantum graphs (QGs). By mapping the three scattering channels of a QG onto the basis states of a quantum three-level system (qutrit), …

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Research on precise positioning based on image recognition technology

Duanfeng Liu, Gaili Gao

Aiming at the problem that it is difficult to determine the picking location for the picking robot, precise positioning of picking grapes based on Mask-RCNN network and Cannylines detector is proposed in this paper. Firstly, the grape images under shading, direct sunlight …

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Monitoring dispatching system based on Port's Internet of Things

Duanfeng Liu, Xuli Han, Xinru Liu

This paper proposes monitoring dispatching system solution based on the internet of things, which is through the analysis for port’s current situation, system components, operation process, communication protocol and safety alarm, etc. The system can fulfill real-time precise positioning monitoring and dispatching …

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Grid generation based on stress balance

Xinru Liu, Xuli Han, Duanfeng Liu

In this paper, we deal with the method of grid generation. From the perspective of deformation mechanics, we propose a new method to generate grid with boundary constrain. Based on the stress balance equation on the node of the domain, the coordinate …

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Controllable density grid generation with boundary constrains

Xinru Liu, Xuli Han, Duanfeng Liu, Li Tan

This paper deals with the generation of controllable density grid with boundary constrains. Based on improving the distribution of function value, a class exponential function is used to provide a method to generate grid by the curves of two parameter directions. Then, …

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Some Classes of Upper Embeddable Graphs

Duanfeng Liu

Using some special properties of graphs,such as the vertex-set of a graph with a C-division,every edge of a graph belonging to a 3-circle,the graph without cut-vertex and so on,the author studies the maximum genus of graphs,and obtains a class of upper embeddable …

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Some new classes of upper embeddable graphs.

Duanfeng Liu, Xinru Liu

A method Based on Boundary Deformation for Planar Grid Generation

Xinru Liu, Duanfeng Liu, Xuli Han

This paper puts forward a method based on the boundary deformation for planar grid generation. Many methods start with the special properties of grid and switch to the solution of a direct optimization or a non-linear minimum cost flow. Though with high …

The maximum genus on graphs in terms of diameter and girth

Duanfeng Liu

Using the diameter and girth of a graph to study the lower bound of the maximum genus, this paper obtains the following results: Let G be a simple graph with diameter d, if its girth is not less than d (d ≥ …

The Maximum Genus of Graphs With Diameter Four

Duanfeng Liu, Huang Yuan-qiu, Gdut Guangzhou

This paper proves the following results:Let G be a simple graph with diameter four,if G does not contain the complete subgraph K_3 of order three,then the Betti deficient number of G,e(G)≤2,and thus the maximum genus of G,γM(G)≥1/2β(G) - 1.Meantime it is shown …