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Address space randomization is an attractive way to counter against code-reuse attack. However, traditional Address Space Layout Randomization (ASLR) just randomizes the base address of a binary, whose relative address is not changed. So attackers can still use the fixed relative address to construct gadgets needed by code-reuse attack through information leakage. Although many fine-grained randomization...
Co-location pattern mining, which discovers feature types that frequently appear together in a nearby geographic region, is an important branch of spatial data mining. With the evolving of computation and communication technology, spatial information is included into more and more datasets. However, existing techniques of mining co-location patterns have to generate all candidate patterns for further...
Two-way satellite time and frequency transfer (TWSTFT) is one of the major techniques to compare the atomic time scales between timing laboratories. As more and more TWSTFT measurements have been performed, the large number of point-to-point 2-way time transfer links has grown to be a complex network. For future improvement of the TWSTFT performance, it is important to reduce measurement noise of...
It is very important for generating an orthonormal multiwavelet system to construct a conjugate quadrature filter (CQF). In this paper, a general method of deriving a length-J + 1 conjugate quadrature filter with multiplicity r and scale a from a length-J conjugate quadrature filter is obtained. As a special case, we study generally the construction of a length-J + 1 conjugate quadrature filter which...
An efficient algorithm for solving Fredholm systems is proposed with operational matrices of integration of Haar wavelets. Numerical experiments demonstrate that the approximate solutions obtained by the presented algorithm have wonderful agreement with the analytical solutions and tend to be more accurate with the increase of the order of the Haar wavelet.
In this paper, the problem of feedback equivalence to a passive system is studied for a class of nonlinear stochastic systems. Based on a nonlinear stochastic KYP lemma, we investigate the relationship between a passive system and the corresponding zero-output system, which sustains a different result from the deterministic case. Following the stochastic passivity theory, a sufficient condition is...
This paper provides a simplified design scheme for the control of a class of nonlinear systems in strict-feedback form by incorporating dynamic surface control (DSC) method into an adaptive fuzzy logic system. The DSC method overcomes the problem of ldquoexplosion of complexityrdquo in the traditional backstepping design. Fuzzy logic system (FLS) is used to approximate the nonlinear uncertainty. Adaptation...
We introduce the basic theory and design method of model-free learning adaptive controller (MFLAC) in this paper. Then a improve method of MFLAC based on multi-innovation theory is presented. Simulation results show that MFLAC and proposed MFLAC have better performance to PID controller for unstable system; what's more, the proposed model-free controller has faster convergence rate and better tracking...
In this paper we compare the PTB-TL time transfer link data of TWSTFT and GPS carrier phase solutions. We investigated in detail the double difference between the time transfer data of TWSTFT and GPS IGSC/TAIPPP. Our results show the PTB-TL link has a conspicuously diurnal effect. The periodicity is almost exact 1 day and the peak-to-peak amplitude is about 1~1.5 ns. We also found a phase drift which...
A novel model was proposed for short-term electricity price forecasting based on rough set approach and improved support vector machines (SVM). Firstly, we can get reduced information table with no information loss by rough set approach. And then, this reduced information is used to develop classification rules and train SVM, at the same time, we make use of the particle swarm optimization to optimize...
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