Beijing Subway Operation Technology Center

Beijing, China

Beijing Subway Operation Technology Center

Beijing, China
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Zhou Z.,University of Chinese Academy of Sciences | Zhou Z.,CAS Institute of Electrical Engineering | Ge Q.,CAS Institute of Electrical Engineering | Cui T.,Beijing Subway Operation Technology Center | Zong L.,Beijing Subway Operation Technology Center
2015 18th International Conference on Electrical Machines and Systems, ICEMS 2015 | Year: 2015

This paper compares the performances of Voltage Oriented Control (VOC) and Direct Power Control (DPC) with hysteresis loop in three-phase voltage source rectifier (VSR), which can be applied to the front-end rectifier in state of art 380V DC distribution system for green data center. Both systems achieve high power factor, low input current distortion and high efficiency. And the simulation results show higher reliability with VOC strategy while lower distortion and higher power factor in DPC realization. © 2015 IEEE.


Zhao A.Q.,Beijing Jiaotong University | Weng Y.N.,Beijing Subway Operation Technology Center | Lu Y.,Beijing Subway Operation Technology Center | Liu C.Y.,Beijing Jiaotong University
The Scientific World Journal | Year: 2014

WirelessHART is the most widely applied standard in wireless sensor networks nowadays. However, it does not provide any dynamic routing mechanism, which is important for the reliability and robustness of the wireless network applications. In this paper, a collection tree protocol based, dynamic routing mechanism was proposed for WirelessHART network. The dynamic routing mechanism was evaluated through several simulation experiments in three aspects: time for generating the topology, link quality, and stability of network. Besides, the data transmission efficiency of this routing mechanism was analyzed. The simulation and evaluation results show that this mechanism can act as a dynamic routing mechanism for the TDMA-based wireless sensor network. © 2014 A. Q. Zhao et al.


Zhao A.,Beijing Jiaotong University | Chen L.,Beijing Jiaotong University | Wen Y.,Beijing Subway Operation Technology Center | Lu Y.,Beijing Subway Operation Technology Center
Journal of Computational and Theoretical Nanoscience | Year: 2015

This paper focuses on the combination of Interface Switching technology and IP backbone network. The concept of Interface Switching Network Architecture is proposed in which control plane is separated from data plane. In the data plane, Interface Switching technology is adopted and packets are forwarded based on the ISeq of the path carried in the header, without the look-up operation on FIB, which makes packet switching much easier and faster. In the control plane IP routing protocols are extended to collect routing information and the available resources to serve data plane. The performance evaluation is conducted through theoretical analysis and simulation experiment. The results show that Interface Switching forwarding program can provide the forwarding bandwidth five times as that of IP forwarding program under the same condition which fully illustrates the advantage of Interface Switching Network Architecture in data forwarding. © 2015 American Scientific Publishers All rights reserved.


Zhao A.,Beijing Jiaotong University | Lu Y.,Beijing Subway Operation Technology Center | Weng Y.,Beijing Subway Operation Technology Center
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

The research work of this study focuses on the design and implementation technology of terminal in Vector Network (VN) based indows platform. The VN is a kind of new communication network with vector address as the switching adon Wdress. The premise of successful deployment of VN is its integration with the current IP networks, so it is necessary to study the implementation technology of VN terminal on the base of IP terminal. Firstly, a kind of software implementation method of VN terminal and a kind of integration method of VN and IP networks named "IP over VN" were proposedin this study. Secondly, the VN driver module was designed and implemented based on the NDIS driver interface and the key technique in the implementation was summarized. Finally, the experiment network was built to test the functions of VN terminal. The test results validated the rationality of the design and implementation scheme of VN terminal. The work of this study establishes the foundation for the deployment of VN and provides an example to the development of similar systems. © Maxwell Scientific Organization, 2013.


PubMed | Beijing Subway Operation Technology Center and Beijing Jiaotong University
Type: | Journal: TheScientificWorldJournal | Year: 2014

WirelessHART is the most widely applied standard in wireless sensor networks nowadays. However, it does not provide any dynamic routing mechanism, which is important for the reliability and robustness of the wireless network applications. In this paper, a collection tree protocol based, dynamic routing mechanism was proposed for WirelessHART network. The dynamic routing mechanism was evaluated through several simulation experiments in three aspects: time for generating the topology, link quality, and stability of network. Besides, the data transmission efficiency of this routing mechanism was analyzed. The simulation and evaluation results show that this mechanism can act as a dynamic routing mechanism for the TDMA-based wireless sensor network.

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