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A Study on the Application of Artificial Intelligence in Direct Torque Control

Author: DongShuLe
Tutor: XuMing
School: Hangzhou University of Electronic Science and Technology
Course: Applied Computer Technology
Keywords: JPEG file carving complex File Recovery Computer Data Forensics BP neural network algorithm Content features
CLC: TN919.81
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 0
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Abstract


In recent years, with the rapid development of information technology, computers and other digital devices usage surge. Meanwhile, the high-tech field of criminal and judicial disputes have become increasingly prominent, not only to the victims and caused a huge loss to the community, national security, social and cultural harm caused immeasurable. A large number of computer crime cases forensic work needs to save extracted data in a digital device. In order to reproduce the scene of the crime computer crime, to find the perpetrators of criminal evidence, we need to restore has been deleted, encrypted or corrupted files, or even need in the file system has been damaged or lost disk data recovery premise down. Therefore, the file carving complex technology as a need to restore files with the file system in the field of computer forensics technology has become an important research topic has important theoretical and practical significance. JPEG as the current most popular format for storing images and digital images is one of popular criminals \For JPEG files carving complex attracted the attention of many researchers at home and abroad. In the file system without any prior knowledge of the assumptions, this article on how to solve the data fragmentation, disorder JPEG file recovery in case of a study of this issue. First, from the file system began to introduce, clarify cause data fragmentation or disorder causes. Further in-depth and detailed analysis of the various existing JPEG file carving complex methods, such as simple carving complex, the file header / Max length carving complex, Smart carving complex, two-slice gap carving complex, complex file mapping carving, carving complex graph theory, rely on the file carving complex internal structure and other methods. On this basis, by summing up the existing file carving complex technical limitations and challenges, describing the JPEG file carving complex technology in the future direction of development should be combined with a variety of file carving complex methods take advantage of the internal structure of JPEG files and content Characteristics of knowledge and attention to addressing fragmentation and head damaged JPEG files JPEG files technologies. Second, multi-data collection, in-depth analysis of the internal structure of JPEG files, content, features and compression encoding process is proposed based on content features JPEG file carving complex method. The principle in carving complex graph theory, based on the complex process of carving the document as a probabilistic model, and the neural network model constructed matching error back propagation algorithm to calculate the weights of two blocks of data in the original file is adjacent probability. Again, in order to further reduce the \Previous chapter match candidates obtained decoded data block, and an image obtained through a series of processes described in the outline of the object, feature extraction, feature vectors used to construct the line segment, according to the local geometric properties contour matching, so as to achieve a further verification the original data blocks in the original document is adjacent purposes. Finally, in order to confirm the above carving complex theoretical feasibility and validity of this method is applied DFRWS 2006,2007 carved complex puzzle challenge datasets detailed experimental procedures designed to explain the corresponding experimental details for the experimental The results of a comprehensive discussion and analysis. Experimental results show that the method can effectively carving complex structure in the absence of the original disk image to restore full continuous, orderly or disorderly slice slice JPEG files.

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