Papers by Author: Li Cheng Yu

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Authors: Zong Hui Wang, Shu Su Shi, Li Cheng Yu, Wen Zhi Chen
Abstract: FCD-based traffic navigation system is getting more and more attention from countries all over the world. Shortest path algorithm is one of the key techniques of a traffic navigation system. Since classical Dijkstra algorithm and heuristic A* algorithm cannot support some constrained conditions in practice, and existing algorithms supporting constraints require the road network to be modified ahead and have low efficiency. The paper studies the model of road network, and analyzes two types of constraints, one-way street and intersection turning prohibitions, then proposes the constrained A* algorithm and gives the Heuristic function. Finally, the paper tests and analyzes the algorithm, and evaluation performance of the prototype system which employs it. The result shows that the algorithm’s efficiency is fairly good.
Authors: Xiang Li, Li Cheng Yu, You Hui Zhou, Yang Li, Xun Zhang
Abstract: As the sandwich structure materials extensively used in the engineering field, the existing sandwich structure materials can not meet the requirements of engineering design gradually. New sandwich structural materials with efficient, energy-saving and easy processing need to be developed urgently. Relying on the mature research results now on honeycomb sandwich structure, the class-honeycomb sandwich structure is put forward for the first time, meanwhile, innovate configuration in the structure. Based on this, the paper analyzes the mechanics properties of the structure and the results showed that the new class-honeycomb sandwich structures mechanics properties have improved greatly compared with the original hexagonal honeycomb sandwich structure. And also simulation analysis was carried out on the cores structure. The validity of the equivalent elastic constant is confirmed through the theoretical analysis and simulation analysis. For this reason, it has great theoretical significance and engineering application value.
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