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For the strong electromagnetic field interference, electric eddy current sensors can not measure the rotor vibration. This paper presents a new measurement system based on the linear array CCD sensor, optical system and computer. The vibration signal acquisition is processed by Fourier transform and wavelet analysis, to get rotor vibration information. Experiments show that the rub impact and impact...
With the rapid development of internal combustion engines (ICE) industry, the cross-section contour of variation elliptical piston skirt is widely used in order to achieve better mechanical and thermodynamics performances which the cross-section elliptic degree is diverse in the highness direction and the axis section contour is convex curve. Because of its complex form its geometrical precision evaluation...
By studying mental arithmetic for healthy adults by statistical analysis and investigating the load of local areas, the study is better to learn how the brain works. Subjects are 22 right-handed healthy university males. Subjects were asked to do mental arithmetic twice independently. Numbers were selected during 1 to 10 randomly. Every two numbers were given respectively; the time interval of them...
The main theme of this paper is to analyze Microsoft's implementations of Trusted Computing in Windows NGSCB. First of all, set in the two most important components of trusted computing system, which is secure computer platform and secure & trusted system. And then, Set forth the implementation of secure computer platform from TPM and trusted boot sequence. Then, analyzed the NGSCB implementation...
CAPTCHA is a test that can tell humans and computer programs apart automatically. The aim is to allow the server to identify the visitor is a human or a computer, and only provide services to human. It can improve the current server system and user information security. The static plane visual CAPTCHA based on OCR problems with the advantages of implementation and operation[1] become the mainstream...
Nowadays, malicious computer programs have attempted to attack websites, greatly affecting their availability and security. CAPTCHA (Completely Automated Public Turing test to tell Computers and Human Apart) mechanism is an effectual method in solving this problem. The prevailing implementation of CAPTCHA is 2D still image verification code, however, the developing artificial intelligence and image...
In order to avoid tremendous attack from malicious computer programs, CAPTCHA (Completely Automated Public Turing test to tell Computers and Human Apart) mechanism has been introduced to distinguish humans and computers. Due to the fast development of pattern recognition and artificial intelligence technology, there are increasing safety loopholes concerning traditional 2D static CAPTCHAs, resulting...
With the development of the Internet, network users urgently hope the service providers to provide the services what they need. The paper introduces the basic structure based on the analysis of user behaviour. In the structure, different contents of the user behaviour are achieved. After dealing with these contents, the knowledge of data mining is used to analyze the degree of the user interest. And...
The timetabling problem is a NP-complete problem which has been committed to finding a solution by the field of operations research and computer but has not got a good solution. The timetabling is the most important problem in the course scheduling. With the development of disciplines, the change of the size and direction of enrollment, increasing the difficulty of the Course Scheduling. This paper...
In order to distinguish between human users and computer programs, CAPTCHA (completely automated public turing test to tell computers and human apart) mechanism is widely applied in Web sites such as accounts application Web site. While the major implementation of CAPTCHA method-2D still image verification code based on OCR technology is threatened by developing artificial intelligence and image recognition...
By using of chaotic map and block-wise independent technology, a new chaotic fragile watermarking algorithm is proposed in this paper. Firstly, location key is looked as logistic chaotic initial value to iterate and create location matrix, according to this matrix we can generate mapping image and identify the embedding location of watermarking in image blocks. Then watermarking sequence related with...
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