We propose an image encryption/decryption algorithm based on chaotic control parameter and hyperchaotic system with the composite permutation-diffusion structure. Compound chaos mapping is used to generate control parameters in the permutation stage. The high correlation between pixels is shuffled. In the diffusion stage, compound chaos mapping of different initial condition and control parameter generates the diffusion parameters, which are applied to hyperchaotic cellular neural networks. The diffusion key stream is obtained by this process and implements the pixels’ diffusion. Compared with the existing methods, both simulation and statistical analysis of our proposed algorithm show that the algorithm has a good performance against attacks and meets the corresponding security level.
In this paper, automatic scanning infrared laser nondestructive testing methods, such as aero-engine blades crack
detection of defects; Use of thermal heating differential equations and leaves the surface temperature distribution in the
infrared detection system to allow resolution under discussion laser scanning heating infrared detection engine blades
crack defects. The method can be nondestructive testing of metal parts of the internal defects, such as micro-cracks, loose,
porosity and so on, like the thin parts more effective. First introduced in the infrared detection system works as using
laser scans of the work piece to be seized automatic heating pretreatment, to detect internal defects part of the nature and
characteristics of purpose. The paper also build a two-dimensional analysis model of detected objects because of
defective parts and non-defective parts of the geometry and physical properties of heat there is an obvious difference in
surface temperature caused by the different response, therefore, can discuss affect of the temperature distribution of
information, to determine the appropriate method. Discuss and analysis interaction between the loading heat flux density,
length and depth of defects, and do some heat transfer analysis to measured the surface temperature distribution. Through
load a constant heat flow to blades, the infrared detection system can obtain the surface temperature field of existence the
temperature difference, which blades cracks determine the existence and its location.
This paper investigated phenomenon of hyperchaos based on the semiconductor laser with the non-linearity dynamics, research synchronize of hyperchaos under drive-response. Make used of the semiconductor laser and their equations about take to adjust and design some of parameters. Last realize some aim of the optical communication. In this paper, it analyzed and investigated chaotic produce and chaotic modulation, further underline and point out, hyperchaos is an important physical phenomenon in the optical information processing technology. The chaos strange attractor, it has a property that is the most susceptivity toward initialization condition, and it is an important method for research secrecy communication. About study some regular and characteristic in the hyperchaos how to obtain synchronize at two or more systems. It is favorable to extend some fields of application in the optical communication and optic information processing.
KEYWORDS: Software development, Digital signal processing, Signal processing, Antennas, Telecommunications, Computer programming, Filtering (signal processing), RF communications, Data processing, Data communications
Structure of the software radio system and basic theory are discussed and analyzed in this paper. Point out necessity of research the software radio and it's develop foreground, accentuate status of wireless system development, condition of software programmable technology and software develop. The paper introduced application diapason of the software radio and high-tech result of current headway in the international, such as the soft interface, the software BUS and the radio frequency synthesis and so on. To need develop tools and debugging work for software radios, the article given some recommendation. For the moment, also pay attention especially to exist some problems when research to the software radio. In the paper author take notice of application of communication and network; cordially put forward a series of suggestion and appreciation, too. The software radio is a system that it is used of the software to control, digit signal processing mode, to complete simulate wireless signal work state. So, work principle of the software radio and simulate mode consult each other, further give prominence to software programming, it and simulate mode have a lot of difference. Software radio using, it can meet information and culture all of requirement. It has obvious characteristics: It can be programmable completely. Used software to program realizes wireless a lot of advanced and complicated function that software work processes incarnate out full digital format. It is used of the network interface and to easy use program application to extend that work environment of more frequency paragraph and more systems, and encode unification. It has unification secrecy property; equipment upgrade and change type is easy, because it is software main, if change an applying the software, the equipment is renovated immediately.
KEYWORDS: Safety, Transducers, Databases, Computing systems, Telecommunications, Data communications, Local area networks, Human-machine interfaces, Windows NT, System integration
Designed a set of the network system of data information management in this paper It is this conception that base on Client/server to take synthesis layout and data information exchange manage. And it researched the interface LAN and WAIS. It also is dissertated as network structure and function of system and integrated array of system. Selection of these devices, colligation of wiring and configure of Software/Hardware also are expatiated. This system has best function and property such as the database management, data on the safe side, man-machine conversation interface and local keep secret. This development environment of system adopts popular structure of present computer applied management system, namely Client/Sever structure. It is mainly composed of database server and customer application program as well as network. Data information management system of police base on Client/Server mode overcomes above-mentioned shortcomings. In the heterogeneous distribution environment, this system achieves information col lector and integrated processing. And the network connection about general station and branch as well as different local police station is accomplished, so it meet the needs on the fastness and accuracy and safety of the data information management and data information transmission.
It is based on the semiconductor laser that design and researched hyperchaos feed back system with electronic modulate in this paper. The system adopted multidimensional and cascades connection manner to constitute modularization: it also may increase or reduce when it is needed. The paper takes to theory analysis and practice hyperchaos experiment about system, and carry through some electronic parameter modulate and wave spectrum analysis, it has definite practicality.
This article make used of the Electro-Optics device to research chaotic phenomenon and their self-adapting parameter modulate system. Self-adapting parameter modulation system main is given priority to electronic modulation. It given some chaos equation of parameter modulation and analyze signal waves to self adapting change rule of the detection for measuring instrument- exterior modulate inject electronic parameter into phot-electricity system in this paper.
Annealed high speed steels for making tools such as W6Mo5Cr4V2, W9Mo3Cr4V1, W18Cr4V were treated with 5 kw continuous adjusting CO2 laser. By controlling laser- processing parameters, we achieved variable datum about the depth and hardness of the surface hardening layer of the samples. The relationship between the depth of hardening layer and laser processing parameters were studied with microhardness meter, scanning electronic microscope. The results showed that the sample's micro organization was markedly fined, dislocation and twin crystal subconstruction was strikingly increased, its hardness was obviously higher than that of general heat treatment.
The thesis demonstrates mainly about 2D photoelectric universal detection and measurement system's theory and application to measure rotator findings' size and shape tolerance in mechanical manufacture. It tells how to detect and measure automatically rotator findings' axial size, redial size and shape tolerance,. attaching laser scanning detection and measurement technique with Raster displacement detection and measurement technique controlled by microcomputer. The system is a high-technique product, which are multi-subject and multi-field.
Considering laser scanning technique, IR method and electronic technology, studied and design a set of IR NDT system with laser scanning automatic, heat loading method in this paper. To make use of this device, it may detect internal defects of metal material parts, such as micro- craze, refraction, blowholes, etc. This paper also introduce the work principal of testing system. It heats automatically pretreatly to workpiece with CO2 laser scanning and through IR technique received temperature field from workpiece heat conduction. After the filter and the A/D converter system, the changed signal is sent into a single chip computer and the computer make it complete data analysis, data processing, save and display. Therefore, it can achieve detecting characteristic and property of internal defects of parts.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.