Jun W.,Zhejiang University |
Yi X.,Zhejiang SUPCON Technology Co.
IEEE International Conference on Control and Automation, ICCA | Year: 2013
A noise immunity automatic test method for analog acquisition module of control system based on virtual instrument is proposed. The traditional method is too complicated and inefficient. This paper designs a set of efficient common and series mode noise immunity automatic test system based on virtual instrument. Through the programmable function of virtual instrument we develop test processes such as signal source input, disturbance exerting, data acquisition, data recording and dynamic analysis, and test report can be generated automatically. The experimental results show that the common and series mode noise immunity automatic test system based on virtual instrument can work continuously for a long time, and can do multi-channel parallel test, which significantly improves the test efficiency. © 2013 IEEE. Source
Lin Y.,Zhejiang Sci-Tech University |
Xu X.,Zhejiang SUPCON Technology Co.
Lecture Notes in Electrical Engineering | Year: 2013
In this paper, we introduce a new image auto-segmentation algorithm based on PCNN and fuzzy mutual information (FMI). The image was first segmented by PCNN, and then the FMI was used as the optimization criterion to automatically stop the segmentation with the optimal result. The experimental results demonstrated that the CT and ultrasound images could be well segmented by the proposed algorithm with strong robustness against noise. The results suggest that the proposed algorithm can be used for medical image segmentation. © 2013 Springer-Verlag. Source
Zhou Y.,Harbin Institute of Technology |
Chang G.,Harbin Institute of Technology |
Chang G.,Xiamen Products Quality Inspection Institute |
Ma J.,Harbin Institute of Technology |
And 3 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2011
In order to improve the anti-radiations performance of space optical communication system, the effects of laser diodes radiation damage on bit error rate of space optical communication system was discussed. On the basis, the impact models of laser diodes cumulative radiation damage on the bit error rate of space optical communication system were further deduced. Simulation was compeleted. The result shows that radiation induces linear decrease of laser diodes output power. Bit error rate can be neglected when radiation dose is lower than 1000 Gy. The influence of radiation on bit error rate increases rapidly when radiation dose is larger than 3000 Gy. Adjusting bit error rate appropriately is an effective measures to improve anti-radiation performance. The theoretical results provide reference for the space optical communications applications. Source
Zhang H.,Zhejiang University |
Feng D.-Q.,Zhejiang University |
Chu J.,Zhejiang University |
Wang Q.,Zhejiang SUPCON Technology Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2010
To achieve precise time synchronization in line-topology or ring-topology Computer Numerical Control (CNC) system, time synchronization precision exceeded the microsecond level with time synchronization level increase should be solved. The time synchronization between two nodes was accomplished by Network Time Protocol (NTP) algorithm. The relay nodes used transparent clock algorithm, all time synchronization messages were restored in relay nodes for a definite time. Effect of deviation of crystal oscillator in relay nodes on precision was reduced. The accumulated deviation of all nodes was decreased. Theoretical analysis and experimental results showed that, this algorithm reduced the jitter of time synchronization and achieved higher level of precise time synchronization in CNC system. Source
Huang W.,Zhejiang University |
Xie D.,Zhejiang University |
Lu S.,Zhejiang University |
He W.,Zhejiang SUPCON Technology Co.
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2010
This paper presents a control network redundant scheme, which is based on two redundant networks. Senders introduce message ID into standard Ethernet frame and send same messages on both networks at the same time. Receivers discard duplicates using message ID with bumpless recovery. By analyzing received network-diagnosis messages, the nodes diagnose networks mutually and maintain network status mapping-tables. Messages are classified into two main kinds according to their importance. Less important messages are transmitted separately on two redundant networks when networks work well. In this way, communication loads of both networks are reduced at usual work status. Experimental results show that this scheme improves the availability of the networks. Source