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Dual receiver topology for bipolar dynamic wireless power transfer systems
Hao Qiang,Jianbo Wang,Tian Xu 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
Segmented dynamic wireless power transfer (DWPT) systems can solve the problems of large battery size, long charging time, and the limited driving range of electric vehicles (EVs). Aiming at the load voltage fluctuation caused by the mutual inductance drop when moving over two adjacent transmitting coils, this paper proposes a novel segmented DWPT system with dual receiver topology circuits. The current phase difference between two adjacent transmitting coils is controlled to 180 degrees. The dual receiver topology circuits are in series to improve the output voltage. According to the real-time position of the EV, the system has two working modes under the control of the proposed topology, which consists of three fully controlled components and six diodes. Finally, experiments were carried out and the obtained results show that the designed topology is effective when it comes to reducing the voltage fluctuation when passing two adjacent transmitting coils. In addition, the topology is able to maintain a high transmission efficiency with a maximum efficiency of 87.68%.
Apply Partition Tree to Compute Canonical Labelings of Graphs
HAO Jian-Qiang,GONG Yun-Zhan,Tan Li,Duan Da-Gao 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.5
This paper establishes a theoretical framework by defining a set of concepts useful for classifying graphs and computing the canonical labeling Cmax(G) of a given undirected graph G, which including the partition tree PartT(G), maximum partition tree MaxPT(G), centre subgraph Cen(G), standard regular sequence SRQ(G), standard maximum regular sequence SMRQ(G), and so on. The implementations of algorithms 1 to 5 show how to calculate them accordingly. The worst time complexities of algorithms 1, 2, 4, and 5 are O(n2) respectively. The time complexity of Algorithm 3 is O(n). By Theorem 3, all leaf nodes of PartT(G) and MaxPT(G) are the regular subgraphs. By Theorem 4 and 5, there exists only one Cen(G) in G. Regular Partition Theorem 6 shows that there exists just one corresponding PartT(G), SRQ(G), MaxPT(G), and SMRQ(G). One can use Classification Theorem 7 to category graphs. Theorem 8 and 9 establish the link between the Cen(G) and the calculation of the first node u1 added into MaxQ(G) corresponding to the canonical labeling Cmax(G) of G. Further, it utilizes the Cen(G) to calculate the first node u1 added into MaxQ(G). The proposed methods can be extended to deal with the directed graphs and weighted graphs.
Good performance of Sc (0001) surface adsorbing CO molecule
Hao Zhi-Qiang,Yang Jian-Long,Li Hui,Yao Jian-Gang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
There is a big discrepancy in terms of calculating the surface energy of the HCP Sc (0001) surface for previous theoretical results. Herein, we used a relatively reasonable method to predict the calculated value (1.263 J/m2), which agrees well with the experimental outcome (1.275 J/m2). Based on this, the adsorption behaviors of CO at different sites, i.e., hollow (H1, H2, and H3), bridge (B1), and top sites (T1), were explored theoretically. The results suggest that hollow sites, particularly the H1 site exhibits a good performance in adsorbing CO molecule, and that the adsorption energy reaches nearly 3.5 eV, which corresponds to a significant elongation of the C–O distance (more than 24%). In addition, the CO adsorbed at the H1 site is seen to be located parallelly at the surface. An obvious substantive variation of the CO molecular orbit of H1 adsorption site is observed.
Hao, Jian,Zou, Run-Hao,Liao, Rui-Jin,Yang, Li-Jun,Liao, Qiang,Zhu, Meng-Zhao The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
Natural ester is a suitable substitute for mineral oil and has been widely used in AC transformer in many countries. In order to further application of natural ester in direct current (DC) equipment, it is needed to investigate its long term insulation property under DC condition. In this paper, a thermal ageing experiment was conducted for both mineral oil-paper and natural ester-paper insulation. The DC breakdown and space charge characteristics of insulation paper impregnated with natural ester and mineral oil was compared. Results show that the resistivity of the paper immersed in natural ester and mineral oil both increase as the ageing goes on. While insulation paper impregnated with natural ester has higher resistivity and DC breakdown voltage than the paper impregnated with mineral oil. The DC breakdown voltage for the oil impregnated insulation paper being DC pre-stressing is higher than that without pre-stressing. The average DC breakdown field strength difference between the test with pre-stressing and without pre-stressing clearly shows that there is an apparent enhancement effect for the homo-charge injection on the DC breakdown.
Using the Eigenvalue Partition to Compute the Automorphism Group
HAO Jian-Qiang,GONG Yun-Zhan,LIU Hong-Zhi 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
To solve the automorphism group of a graph is a fundamental problem in graph theory. Moreover, it usually is an essential process for graph isomorphism testing. At present, because existing algorithms ordinarily cannot efficiently compute the automorphism group of a graph, ones cannot entirely resolve the graph isomorphism problem. To calculate the automorphism group of a weighted graph, first, briefly review the history of automorphism. Second, introduce the concept of eigenvalue partition. Third, using algebraic methods, examine not only the relationships between the diagonal form of an adjacency matrix and its eigenvalues and eigenvectors, but also the relationships between its eigenvalues and eigenvectors and the automorphism group. Furthermore, prove Theorem 2 to 8. In addition, propose Conjecture 1 and three open problems. By these theorems, present a novel method to resolve the automorphism group of a weighted graph. If a graph has no duplicate eigenvalues and Conjecture 1 is true, it can determine the automorphism group of a weighted graph in polynomial time by the method. Although this method has certain limitations and needs improvements, it is theoretically a necessary complement to solve the automorphism group. Finally, it shows the close relationships that exist between an orthogonal matrix and a permutation matrix, also an orthogonal matrix and an automorphism.
Jian Hao,Run-Hao Zou,Rui-Jin Liao,Li-Jun Yang,Qiang Liao,Meng-Zhao Zhu 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
Natural ester is a suitable substitute for mineral oil and has been widely used in AC transformer in many countries. In order to further application of natural ester in direct current (DC) equipment, it is needed to investigate its long term insulation property under DC condition. In this paper, a thermal ageing experiment was conducted for both mineral oil-paper and natural ester-paper insulation. The DC breakdown and space charge characteristics of insulation paper impregnated with natural ester and mineral oil was compared. Results show that the resistivity of the paper immersed in natural ester and mineral oil both increase as the ageing goes on. While insulation paper impregnated with natural ester has higher resistivity and DC breakdown voltage than the paper impregnated with mineral oil. The DC breakdown voltage for the oil impregnated insulation paper being DC prestressing is higher than that without pre-stressing. The average DC breakdown field strength difference between the test with pre-stressing and without pre-stressing clearly shows that there is an apparent enhancement effect for the homo-charge injection on the DC breakdown.
??强(Guo-qiang Hao) 전남대학교 글로벌디아스포라연구소 2016 전남대학교 세계한상문화연구단 국제학술회의 Vol.2016 No.1
In the new period, the survival situation of overseas Chinese is facing new challenges.With the field research method in anthropology, from the economic interactions, cross-national marriage, language learning and communication etc are described in detail the Laos FengSha Wan in new overseas Chinese survival strategy, thereby Analytical new overseas Chinese in the process of interaction between Laos shown from spontaneous to the coexistence of the concept of change.
Fault-tolerant Topology Control Algorithm for Mobile Robotic Networks
Qiang Wang,Jie Chen,Hao Fang 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.3
In multi-agent systems, it is crucial to maintain a robust and fault-tolerant network topology while minimizes power consumption, especially for the multiple unmanned combat platforms based on mobile robotic networks. This work studies the problem of fault-tolerant topology control in mobile robotic networks. With the aim of constructing self-healing networks, a K-connected topology control algorithm that can cope with faults such as node failures and link disruptions is proposed. The robotic team stays connected in the dynamic interaction topology, even in the face of K−1 nodes departure. Our approach combines power transmission and motion control for constructing a K-connected net-work topology with approximately minimum power to prolong their working life. Extensive numerical simulations demonstrate the effectiveness of the proposed solution are presented.