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  • Xu Jian, Ma Bin
  • 2010
Discrete wavelet transform for signal de-noising to enhance the accuracy of fiber-optic Weight-In-Motion(WIM) system is presented in this paper. The fiber-optic WIM system working principle is demonstrated and the characteristic of the axle weight signal is analyzed. The algorithm of the discrete wavelet transformation and its implementation is discussed in(More)
  • Ma Bin, Xu Jian
  • 2010
With the development of the internet, many important documents can be exchanged online. It is vital to protect the safety and genuineness of the seals in the published documents. In this paper, a new electronic seal system based on the RSA digital signature algorithm and public-key infrastructure is presented. The RSA digital signature algorithm and its(More)
  • Xu Jian, Ma Bin
  • 2010
A new kind of coupling fiber-optic vibration sensor whose sensing mechanism based on the characteristic of the coupler’s coupling output ratio sensitive to the length variation of coupling zone is presented and demonstrated in this paper. The working principle of coupling fiber-optic vibration sensor is analyzed and a prototype system including a(More)
The number of foreign professional digital tester designed for frequency characteristic is not large and the cost is too high as well. What’s more, homemade equipments are complex and bulky with low-accurate attenuator and no phase-frequency characteristic testing functions. To solve these problems, we studied on some key techniques such as the(More)
  • Xu Jian, Ma Bin
  • 2010
Safety and genuineness protection of the documents while traveling over the internet is very crucial. In this paper, a novel watermarking scheme for electronic seal based on discrete wavelet transform (DWT) is proposed. The theory of digital watermark based on DWT for electronic seal is discussed. The watermark signals are considered as a binary sequence(More)
  • Xu Jian, Ma Bin
  • 2010
In order to optimize the trade-off between performance and security of digital signature in electronic commerce; an electronic seal system based on elliptical curve cryptosystem is presented. Elliptical curve cryptosystem is adopted as it is an effective system which has the advantage of fast speed and high security. The identity-based scheme is introduced(More)
  • Ma Bin, Xu Jian
  • 2010
A new kind of coupling single-mode fiber-optic sensor used the coupler's coupling region as sensitive unite is presented. The theory of coupling single-mode fiber-optic sensor is analyzed. According to the relation between the coupler's coupling ratio with the length and refractive index of its coupling region, strain and vibration measuring technology with(More)
  • Xu Jian, Ma Bin
  • 2010
An innovative low-frequency fiber-optic coupling vibration sensor for monitoring vibration of large-size structures is presented. The working principle of low-frequency fiber-optic coupling vibration sensor is discussed and the demodulation system for photoelectric conversion and signal process to its response is designed. A prototype fiber optic vibration(More)
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