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A new information hiding technology is proposed in this thesis. First, we designed a new image scrambling algorithm based on full array, then proposed a method for image information hiding based on image scrambling and least significant bit (LSB) technology. Some experiments show that the method is robustness, practical and has high efficiency in information hiding, it can achieve safe, efficient...
In terms of the high frequency of mis-match of SIFT method under the strong disturb and complex background, this paper proposes a new matching method based on comparing modulus. According to this method, the eigenvector limit is required at first before the normalization processing, and then, accurate matching pairs between two pictures can be found according to the difference between the modulus...
GIS software requires the ability to simplify polyline features in real-time when displaying linear vector data with plenty of vertices. The Douglas-Peucker polyline simplification algorithm has been widely adopted in this area for decades, though it is often criticized for its low performance when exist a large number of vertices on a polyline which should be subdivided into many separate segments...
Electro-hydraulic driving 6-dof parallel robot suffers from non-linearity, strong load coupling disturbance and parameters variations when it moves. In order to solve the problem of precise trajectory tracking for 6-dof parallel robot, a decentralized control strategy was used and a 2-dof QFT robust controller was designed in the joint space of robot. Experiment results show that the 2-dof QFT robust...
Formal analysis and verification for security protocol is a difficult and essential problem in network security. In this paper, one important formal analysis tool --protocol composition logic (PCL) is introduced. Its precursor PDS, structure and central idea are analyzed. After sketching the environment of security protocol, we develop a framework for formal analysis and verification of security protocols...
In this paper, we simplify the definition of regular implication in paper [1] and study the elementary properties of regular implication firstly. In order to learn the analytical properties, we receive the sufficient and necessary condition that the implication is continuous or has the unique discontinuous point (0,0) respectively. Finally,the concept of the regular implication on the completed lattices...
A new methodology of distributed mobile geographic information system (GIS) grid model is studied based on mobile agent and grid computing environment. Key technologies are presented in the model, including mobile agent (MA) distributed computing, grid computing, mobile GIS, global positioning system (GPS), transfer control protocol/internet protocol (TCP/IP), and user datagram protocol (UDP). In...
In this paper, two-position seeking north project of magnetic suspension gyroscope is introduced. Two opposite points are sampled, which can counteract the constant excursion influence. And the rotation rate of the earth equations is further decomposed in the gyro reference frame when the pedestal is leveled and is not leveled respectively. The branch rotation rate equations and equations on the sensitivity...
The binocular vision measurement system is adopted in which two CCDs are used and their optic axes are vertical to obtain the attitude of dynamic shell. At first, the mathematic model of the measurement system with vertical optic axes is established, and the calibration and adjustment is implemented to make two CCDs' optical axes vertical and co-planarity. The axis vector of shell is obtained using...
E-mail is the most commonly used network application which has become an important way of network communication. The research of content-based spam filtering technology is a key problem of the Internet security field. The paper described a spam filtering which was based on the Naive Bayesian algorithm and designed a spam filtering model based on the naive Bayesian algorithm. The paper carried out...
This paper defines the mechanism of the Personifying Intelligent Decision-making for Vessel Collision Avoidance(short form for PIDVCA)at open sea which involves ship anti-collision model, decision-making algorithm for ship collision avoidance and model for PIDCVA, all of which is based on the International Regulations for Preventing Collisions at Sea 1972(short form for RULE below) and the ordinary...
In order to remove the drawbacks of the classical attribute reduction algorithm based on attribute importance which can't ensure to gain the simplest decision table and the best noise resisting ability, this paper presents a improved attribute reduction algorithm based on β - variable precision rough sets. A parameter β represents the error resolution and makes the decision table more simple and reliable...
As the switch contacts and the bus are in high voltage, each Phase-to-ground and different phase has high voltage, monitoring of high voltage switchgear electrical junction temperature is always a difficult problem. Face this Special working environment, ZigBee wireless transmission technology can complete the wireless signal transmission channel, solve the high-voltage sensor modules; power supply...
Due to complexity and diversity of large rotating machinery and working conditions, timely and accurate fault diagnosis can not be guaranteed. The method and process of distributed intelligent fault diagnosis based on MAS(Multi-Agent System) are analyzed, and a hierarchical model which uses case based reasoning (CBR) method to carry out fault diagnosis in fault diagnosis expert system is proposed...
The close-in anti-missile naval gun weapon system adopts closed-loop spotting to improve accuracy of firing. The study analyzes the process of closed-loop spotting, pointes out the importance of calculating the optimal miss parameter filtering length to get the maximum hit projectile in all route, comes up with the miss parameter model, establishes the model of calculating calibration corrections,...
Vehicle loads are the most important live load on bridges. It's significant to study the maximum vehicle load in serving period for bridge design, maintenance and safety-evaluation. Stochastic process, such as Possion process or Erlang process, is a powerful model for understanding vehicle loads. While Possion process or Erlang process is only fit for vehicle load acting on one specific bridge, but...
The application of clipping general polygons in regular grids occurs frequently in geographical information systems (GIS). In general terms, the polygons usually clip into rectangle one by one in the pretreatment section, which need high-performance computer and long-time running. And also in this condition the pretreatment section needs low-CPU and low-memory usage. To improving clipping general...
Naval warfare in the future, the anti-ship missile with intelligent, rapid and tactical maneuvering is the greatest threat to surface ships. With the features of rapid response, high shooting and strong target destroying, Close-In Weapon Systems(CIWSs) is mainly qualified for eliminating this threat. Close-in weapon systems simulation can execute the study of fire control algorithm, verify the tactical...
In order to improve the traditional mechanical fault diagnosis expert system, case-based reasoning (CBR) is introduced in this paper for fault diagnosis and a CBR fault diagnosis model is established. In the process of case retrieval, an improved grey correlation model is used to calculate similarity between cases. This model can accurately retrieve similar cases and improve the speed of case retrieval...
This paper based on the heat generation of iron core and windings of transformers, makes a detailed analysis of production costs of iron core and load losses and the influence on top oil temperature and hot-spot temperature of transformers. It also explains clearly the meanings of parameters in winding hot-point temperature equation recommended by GB/T 15164-1994 Loading Guide for Oil-immersed Power...
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