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For the case of intercepting maneuvering target, A new nonlinear terminal guidance law with robustness is proposed by adopting nonlinear H∞ control theory. The mathematic model was built according to nonlinear kinematics relationship between missile and target whose acceleration as disturbance was introduced. Based on the terminal guidance law's measure of zeroing the line-of-sight angular rate and...
We propose a formal model to verify authentication protocols with timeout strategy. After investigating a state-of-the-art model checker named SATMC, the connotative time involved in the rule labels is revealed and utilized, which allows us to re-evaluate the security of authentication protocols with timeout strategy. We illustrate our model by analyzing the security of NSPK protocol. Finally, the...
This article first introduces the basic principle and model of ant colony algorithm which is a kind of swarm intelligence algorithm, then analyzes the defect in large-scale optimization problems of basic ant colony algorithm, and concludes with an improved algorithm to improve execution efficiency and solution quality in solving large-scale problems.
SIFT feature matching algorithm, which has good robustness to image rotation and zoom scale, is a certain degree of stability on the angle changes and affine transformation. It also has the more stable match capacity on images which are taken from any point of view. It has been widely used in the field of wide baseline stereo matching. But the biggest problem is that extracts too many feature points,...
The passive millimeter wave imaging (PMMW) formation has its unique technical advantage which can penetrate the smoke, cloud, drizzle and so on. This paper presents a method of passive millimeter wave imaging using a compressed sensing architecture which can sample the scene signals significantly lower than the Nyquist sampling rate, while the original scene image can be reconstructed with high precision...
Energy efficiency has been known as the most significant problem in all facets of the wireless sensor network operations. For large scale WSN deployed in the battlefield it is necessary to consider energy depletion imbalance, extra overhead and delay brought by the increase of the hop number when designing energy-aware routing scheme. This paper presents a novel routing scheme (Cooperative Robust...
How to effectively organize and manage vast amounts of video data on the Internet, and easily find the information people want is now one of the hotspots. Content-based video retrieval is an important means of managing video database, the efficiency of video retrieval has a direct impact on the efficiency of database management. For the video is unstructured data, the traditional video retrieval cannot...
This paper constructs an integrative indicator system of corporate governance, investigates the relation of corporate governance and liquidity, and illustrates investors' valuation of cash holding. Corporate governance significantly effects cash holding and cash value. Well-governed firms tends to hold less cash, and the cash value of them is higher than that of poorly-governed firms, which means...
In this paper a robust image watermarking algorithm based on DCT by Arnold transform and spread spectrum is proposed. The watermarking image is scrambled by Arnold transform to enhance its privacy. The specific second high-frequency DCT coefficients of the original image are selected effectively according to Human Visual System (HVS) and characteristic of digital image processing and then encrypted...
In this paper, a novel algorithm which has high precision and robustness for Vehicle Dynamics Control (VDC) is proposed, which is based on the Linear Quadratic Regulator (LQR) and the sliding mode control theory. The response of the vehicle can follow the ideal output of the reference model through controlling the yaw rate and side slip angle. The performance of the proposed algorithm is evaluated...
The implementation and optimization of the traditional CLG (Combined local and global) algorithm is always proposed in the gray model. It doesn't make full use of color information. The same global smoothness factor doesn't facilitate discontinuity preservation. This paper, firstly, improves the traditional Gradient Constraint Equation; then combines Horn Schunk algorithm and Lucas Kanade algorithm...
Frequency domain speech enhancement algorithm used in the single-microphone mobile phone usually needs a noise estimator. Minimum Statistics Method can track noise robustly. However, many algorithms based on minimum statistics method do not optimize their tracking factor. In this paper, we derive a new global optimal noise tracking factor controlled by another two new parameters. By combining with...
This paper proposes a mosaic algorithm based on SIFT(Scale Invariant Feature Transform). Keypoints and their descriptors are exacted by SIFT, which ensures the algorithm robust to translation, rotation, noise and scalling. Then proposed matching algorithm is used to match the keypoints. First, rough match pairs are obtained by Nearest Neighbor algorithm. Second, match rate information of the neighbor...
The traditional PID control is difficult in the nonlinear, delay, time-varying conditions and have a disturbance characteristics in supercritical main steam temperature control system to achieve satisfactory control effect. This paper presents a neural network predictive control method using multi-step prediction, rolling optimization and feedback correction control strategy, achieved good control...
Expert system development environment directly affects the efficiency and quality of development of expert system. According to modular machine tool spindle box's design complexity and design goals of multiple solutions, it identifies modular machine tool spindle box expert system platform is the Pro/Engineer. Its development tools are Visual C++6.0 and Pro/Toolkit, its database management system...
This paper is concerned with the problem of robust stability and stabilization of large-scale singular systems with norm-bounded uncertainties in both the derivative and state matrices. By using a parameter dependent Lyapunov function, a proportional plus derivative (PD) state feedback decentralized controller is designed for the closed-loop systems to be quadratically normal and quadratically stable...
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