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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Physical Unclonable Function Techniques Applied For Digital Hardware Protection, Anthony Barrera
Physical Unclonable Function Techniques Applied For Digital Hardware Protection, Anthony Barrera
Dissertations and Theses
"Privacy is an important property that is growing harder to keep as people develop new ways to steal information from users on their computers. Software alone cannot ensure privacy since an infected system is untrustworthy. This paper presents several challenges malware brings that can be solved by using an external processor. Techniques such as keystroke encryption and message authentication can be used to protect users from having their passwords and other private data stolen. To take advantage of the external hardware, a physical unclonable function can be used to generate private keys without the need for storing them in memory. …
Discrete Transforms With Good Time-Frequency And Spatial-Frequency Localization, David Chisholm
Discrete Transforms With Good Time-Frequency And Spatial-Frequency Localization, David Chisholm
Dissertations and Theses
Discrete orthonormal time-frequency basis functions are described and used for both analysis and synthesis of complex-valued signals. We derive expressions for complex-valued expansion coefficients in time-frequency lattices in the discrete one dimensional case. This derivation is based on Professor I. Gertner's previous construction of a complete orthonormal set of basis functions well localized in the temporal-spatial-frequency domain in the continuous case. We describe how these can be generalized to any number of dimensions. Example applications are presented in one and two dimensions. Three dimensional basis functions are visualized and discussed. Finally, a full a Matlab implementation of this work is …
3d Hallway Modeling Using A Single Image, Gregory M. Olmschenk
3d Hallway Modeling Using A Single Image, Gregory M. Olmschenk
Dissertations and Theses
"Real-time, low-resource corridor reconstruction using a single consumer grade RGB camera is a powerful tool for allowing a fast, inexpensive solution to indoor mobility of a visually impaired person or a robot. The perspective and known geometry of a corridor is used to extract the important features of the image and create a 3D model from a single image. Multiple 3D models can be combined to increase confidence and provide a global 3D model. This paper presents our results on 3D corridor modeling using single images. First a simple but effective 3D corridor modeling approach is introduced which makes very …
Theoretical Methods For Blur-Correction In Electron And Soft X-Ray Microscopy, Joanna Klukowska
Theoretical Methods For Blur-Correction In Electron And Soft X-Ray Microscopy, Joanna Klukowska
Dissertations, Theses, and Capstone Projects
The process of object reconstruction from projections is widely used in many fields. One of the applications is the reconstruction of biological specimens from two-dimensional projections in transmission electron microscopy and transmission x-ray microscopy. Various methods have been developed for correcting the blurring that occurs when the projections are obtained by a real instrument. As the attainable resolution increases, new issues become apparent and need to be taken into account in the imaging model. In this dissertation we concentrate on the point spread function and its impact on the quality and usefulness of the reconstructions from images obtained according to …