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Liu B.,Beijing Institute of Technology | Liu B.,Wuhan Naval University of Engineering | Gao J.,Wuhan Naval University of Engineering | Tao W.,Wuhan Naval University of Engineering | And 2 more authors.
Journal of Systems Engineering and Electronics | Year: 2011

A novel low-complexity weighted symbol-flipping algorithm with flipping patterns to decode nonbinary low-density parity-check codes is proposed. The proposed decoding procedure updates the hard-decision received symbol vector iteratively in search of a valid codeword in the symbol vector space. Only one symbol is flipped in each iteration, and symbol flipping function, which is employed as the symbol flipping metric, combines the number of failed checks and the reliabilities of the received bits and calculated symbols. A scheme to avoid infinite loops and select one symbol to flip in high order Galois field search is also proposed. The design of flipping pattern's order and depth, which is dependent of the computational requirement and error performance, is also proposed and exemplified. Simulation results show that the algorithm achieves an appealing tradeoff between performance and computational requirement over relatively low Galois field for short to medium code length. Source

Li X.,China Marine Development and Research Center | Zhu Z.L.,Nanjing Southeast University
Advanced Materials Research | Year: 2014

Geomagnetic matching is a new developmental technology in recent years. For resolving the question of the searching space is too much, a geomagnetic matching algorithm based on AFSSS is proposed, which imitates the fish behaviors such as the preying, swarming, following and leaping etc to achieve the global optimum value, then achieve the emendation of inertial system. Firstly, the affine transformation model between inertial trajectory and real trajectory is displayed. Secondly, from the application of geomagnetic matching point of view, the state of artificial fish (AF), distance and food consistence are defined afresh, and the algorithm flow chart based on AFSSS is given. Lastly, the simulation analysis is performed in an actual magnetic reference map. The simulation results show that the algorithm actualizes the precision localization when the inertial system exist position error, velocity error and heading error and then validates the feasibility of the proposing method. © (2014) Trans Tech Publications, Switzerland. Source

Cheng S.-Y.,Harbin Engineering University | Liu X.-K.,China Marine Development and Research Center
Proceedings - International Conference on Machine Learning and Cybernetics | Year: 2011

Nuclear Steam Generators is very important equipment in nuclear reactor. It should insure sufficient cooling of nuclear reactor and prevent the damage of turbine blades. This paper proposes a new control strategy for Nuclear Steam Generators to ensure its safety and normal operating. The control method is based on fuzzy-PID and water mass inventory. In order to study the controller and validate& verify the control method, the paper adopt to full-scope simulator of nuclear power plants which can simulate the total plant operating characteristics. The simulation test results show that the new controller is superior to the conventional PID controller in controlling the Nuclear Steam Generators. © 2011 IEEE. Source

Cheng S.,Harbin Engineering University | Liu X.,China Marine Development and Research Center | Peng M.,Harbin Engineering University
Applied Mechanics and Materials | Year: 2012

An Monitor& Diagnosis Support System for Nuclear Power Plants (NPPMDS) is developed in the embedded real-time operation system VxWorks in this paper. NPPMCS includes data collection and validation unit, operation monitoring unit, fault diagnosis unit, alarm analysis unit, operation procedures and Human-machine interface and so on. The paper introduces the design and implementation of NPPMDS including the structure of the NPPMDS and the main function units. In order to confirm the validity of this system, the SGTR simulation experiment was carried out on a full scale simulator of nuclear power plants. The experimental results show that the system provides operation support, the load and pressure for the workers can be reduced and the safety of nuclear power plants can be enhanced. Source

Cheng S.,Harbin Engineering University | Liu X.,China Marine Development and Research Center | Peng M.,Harbin Engineering University
Applied Mechanics and Materials | Year: 2012

The Human Machine Interface (HMI) of Monitor& Control System (MCS) is an important part of main control room in Nuclear Power Plants (NPP). The MCS is integrated by networks, digital computers and computer software. The paper discusses a new design mode for the HMI of MCS in Nuclear Power Plants. How to make the MCS information available is the focus of the HMI research. The paper discusses the design and research about the main layout and functions of the HMI. In order to verify and validate the design of HMI, the HMI of MCS is developed by a configuration software of JADE. HMI debugged with the NPP simulator. The Test illustrates that the HMI can help the operators to get very important information from MCS, which help the operators to operate the nuclear plant safely and reduces the human error. Source

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