Science in China Series F: Information Sciences
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Variation-based approach to image segmentation
Science in China Series F: Information Sciences - Tập 44 - Trang 259-269 - 2001
A new approach to image segmentation is presented using a variation framework. Regarding the edge points as interpolating points and minimizing an energy functional to interpolate a smooth threshold surface it carries out the image segmentation. In order to preserve the edge information of the original image in the threshold surface, without unduly sharping the edge of the image, a non-convex ener...... hiện toàn bộ
Design of secure operating systems with high security levels
Science in China Series F: Information Sciences - Tập 50 - Trang 399-418 - 2007
Numerous Internet security incidents have shown that support from secure operating systems is paramount to fighting threats posed by modern computing environments. Based on the requirements of the relevant national and international standards and criteria, in combination with our experience in the design and development of the ANSHENG v4.0 secure operating system with high security level (hereafte...... hiện toàn bộ
Weight hierarchies of linear codes satisfying the almost chain condition
Science in China Series F: Information Sciences - Tập 46 - Trang 175-186 - 2003
The weight hierarchy of a linear [n, k; q] codeC overGF(q) is the sequence (d
1,d
2, …,d
k) whered
r is the size of the smallest support of anr-dimensional subcode ofC. An [n, k; q] code satisfies the chain condition if there exists subcodesD
1⊂D
2⊂…⊂D
k=C ofC such thatD
...... hiện toàn bộ
Supporting service differentiation with enhancements of the IEEE 802.11 MAC protocol: Models and analysis
Science in China Series F: Information Sciences - Tập 50 - Trang 732-746 - 2007
As one of the fastest growing wireless access technologies, wireless LANs must evolve to support adequate degrees of service differentiation. Unfortunately, current WLAN standards like IEEE 802.11 Distributed Coordination Function (DCF) lack this ability. Work is in progress to define an enhanced version capable of supporting QoS for multimedia traffic at the MAC layer. In this paper, we aim at ga...... hiện toàn bộ
Survey of information security
Science in China Series F: Information Sciences - Tập 50 - Trang 273-298 - 2007
The 21st century is the age of information when information becomes an important strategic resource. The information obtaining, processing and security guarantee capability are playing critical roles in comprehensive national power, and information security is related to the national security and social stability. Therefore, we should take measures to ensure the information security of our country...... hiện toàn bộ
A digital authentication watermarking scheme for JPEG images with superior localization and security
Science in China Series F: Information Sciences - - 2007
Parametric control systems design with applications in missile control
Science in China Series F: Information Sciences - Tập 52 - Trang 2190-2200 - 2009
This paper considers parametric control of high-order descriptor linear systems via proportional plus derivative feedback. By employing general parametric solutions to a type of so-called high-order Sylvester matrix equations, complete parametric control approaches for high-order linear systems are presented. The proposed approaches give simple complete parametric expressions for the feedback gain...... hiện toàn bộ
Output feedback stabilization for stochastic nonlinear systems in observer canonical form with stable zero-dynamics
Science in China Series F: Information Sciences - Tập 44 - Trang 292-308 - 2001
In this paper, we study the problem of output feedback stabilization for stochastic nonlinear systems. We consider a class of stochastic nonlinear systems in observer canonical form with stable zero-dynamics. We introduce a sequence of state transformations that transform the system into a lower triangular structure that is amenable for integrator backstepping design. Then we design the output-fee...... hiện toàn bộ
A solution of multidisciplinary collaborative simulation for complex engineering systems in a distributed heterogeneous environment
Science in China Series F: Information Sciences - Tập 52 - Trang 1848-1862 - 2009
This paper presents an integrated approach to multidisciplinary collaborative simulation for complex engineering systems. The formulized paradigm of multidisciplinary collaborative simulation for complex engineering systems is principally analyzed. An IEEE HLA and web services based framework is proposed to provide a heterogeneous, distributed and collaborative running environment where multidisci...... hiện toàn bộ
Analysis of time and frequency synchronization error for wireless systems using OFDM
Science in China Series F: Information Sciences - Tập 48 - Trang 379-396 - 2005
Due to frequency-selective and time-variant property of wireless channel together with additive noise and mismatch of oscillators between transmitter and receiver, there are always time and frequency synchronization errors in a practical OFDM system. To investigate the effect of the two kinds of errors on system performance, the average normalized interference power (NIP) is defined. A simple supp...... hiện toàn bộ
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