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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...
Aspect-based opinion mining is to find elaborate opinions towards an underlying theme, perspective or viewpoint as to a subject such as a product or an event. Nowadays, with rapid growing of opinionated text on theWeb, mining aspect-level opinions has become a promising means for online public opinion analysis. In particular, the booming of various types of online media provide diverse yet complementary...
This paper proposes a novel anomaly detection method of network worms. The algorithm detects unknown worms by multidimensional worm abnormal detection technology, extracts its feature string via analyzing worm data with leap-style and creates new rules to detect the corresponding worm in case that the unknown worm attacks again. The paper has realized the automatic detection of unknown worms. Experiment...
Practical stabilizability of discrete-time (DT) switched systems is studied in this paper. We first prove a sufficient condition for ??-practical asymptotic stabilizability of DT switched systems, then we focus on switched affine systems and present an approach to estimating the minimum bound for practical stabilizability. Based on the approach, we present several new sufficient conditions for global...
Different method calls may have different contributions to the precision of the final application when abstracted into the call strings. The existing call string based pointer analysis algorithms do not consider such contribution difference and hence often can not achieve best cost-effectiveness. To solve the problem, this paper firstly proposes a contribution-based call stack abstraction method which...
The paper addresses the problem of H?? model reduction for uncertain Markovian jump systems with time-varying delay and uncertain switching probabilities. The purpose is to find a low-order model which can be used to approximate the original system such that the error system has a prescribed H?? performance. A sufficient condition is obtained in the form of matrix inequality. The cone complementary...
This paper presents a novel, computationally feasible procedure for computing optimal switching surfaces, i.e. optimal feedback controllers for switched autonomous nonlinear systems. Such systems are regulated by appropriately scheduling their operation modes over time. Given a finite mode sequence, the control task is to determine switching surfaces, which implicitly encode locally optimal switching...
A new traffic-balanced adaptive routing algorithm is proposed for 2-dimensional torus with only four virtual channels, the deadlock avoidance technique is presented based on two levels odd-even turn model scheme. Unlike the previous virtual network routing schemes, virtual channel resource are not equally distributed to the packets, the new method allows all packets have the equal chances to share...
Reduction of operational efforts and complexity are key drivers for RAN long term evolution (LTE). The mechanisms how to ease network performance analyses and problem findings, reduce efforts in maintaining the network becomes hot topic. By introducing self-organizing network (SON) functions, operational efforts are expected to be greatly minimized. A self optimizing function shall increase network...
Most of works, such as looking-up table, queuing and scheduling, are dealt with in traditional switch in serial, which makes the handling capacity in traditional switch become the bottle affecting the switch performance. A novel switch technique called half-step forward switch (HFS) is proposed in this paper to optimize the switch process. HFS makes looking-up table and scheduling be dealt with in...
The principle of AC-AC matrix converter (MC) based on Venturini is studied. This method not only made the power switch control signals understandable, simple and effective, but also realized the MC’s good input-output electrical characteristic. A complete simulation scheme is discussed by Matlab/Simulink and validated by the TMS320LF2407 DSP. Simulation and experimental results both show that this...
Partial transmit sequence approach (PTS) is one of high-performance PAPR reduction techniques for multi-carrier communication systems. However, it has very high computational complexity. This paper presents non-sequential iterative PTS (NS-IPTS) which, instead of adjusting phase factors in sequence, analyzes the influence of the number of the detected peaks on PAPR reduction performance and on complexity,...
For large and complex composite Web services which are composed by BPEL and a set of WSDL and XSD documents, we urgently need the aid of the tools in designing and selecting test cases. However, most of mature testing tools which generate test data with the information of WSDL are used for single service while the research for composition remains in the realm of theory. So we apply the theory of data-flow...
TCP is the prevalent, reliable transport control protocol. It is designed for wired network. However, when it is used in heterogeneous networks, TCP performance will degrade, especially for timing mechanism. This paper analyzes typical timing estimating arithmetic, and then proposes a modified TCP timing mechanism and its performance are investigated through simulations. Comparing with tradition timing...
In this paper, a hybrid cascade multilevel three-phase converter is constructed based on field programmable gate array (FPGA). FPGA comprises thousands of logic gates and it provides flexibility to modify the designed circuit without altering the hardware. So FPGA is applied to design the PWM pulse generator for multilevel converter with no synchronization and communication trouble. A SHPWM pulse...
In this paper, a novel hybrid cascade asymmetrical multilevel converter is proposed. The converter is based on connection of an asymmetric multilevel converter and an H-bridge converter. The multilevel waveform is synthesized by adding of each converter output voltage. The principle of the converter is analyzed. However the new scheme requires fixed floating supplies. Selective harmonic elimination...
A virtual networked environment (VNE) consists of virtual machines (VMs) connected by a virtual network. It has been adopted to create ldquovirtual infrastructuresrdquo for individual users on a shared cloud computing infrastructure. The ability to take snapshots of an entire VNE - including images of the VMs with their execution, communication and storage states - yields a unique approach to reliability...
The nonlinear control especially the feedback linearization is widely used in the induction motor control and PWM converters nowadays. The feedback linearization control performance can be improved by solving the problems caused by the sampling and calculating time of digital processor. The proposed new feedback linearization in this paper is by employing the state observer and predictive controller...
The traditional procedure for analyzing switching converters is based on linearized smooth averaged (small-signal) models and the performance is limited because of the inaccurate model. In this paper, the feedback linearization techniques are proposed to design stabilizing robust controllers for PWM DC-DC converters. Simulation and experimental results validate the analytical predictions.
Pulse train control technique for the control of buck converter operating in discontinuous conduction mode (DCM) is studied in this paper. The operating principles of voltage-mode and current-mode pulse train control techniques are discussed and compared. The operation states of the pulse train control buck converter under different input voltage and load conditions are analyzed. The simulation and...
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