“…Hướng thứ hai: Nhúng dấu thủy vân vào các phần tử trên cột thứ nhất của ma trận U và/hoặc V [3,6]. Ngoài ra, có nhiều nghiên cứu sử dụng đồng thời phân tích SVD với các phép biến đổi ma trận khác như DCT, DWT,… để xây dựng các lược đồ thủy vân kết hợp như trong [2,7,9,10,15].…”
Section: Các Phép Biến đổI Svd (Singular Valueunclassified
In this paper, we propose two watermarking schemes based on QR decomposition, called QR-1 and QR-N. In comparision with watermarking schemes based on SVD decomposition of R. Sun et.al and P. Bao et.al, the proposed schemes have lower computational complexity, higher security, better quality of watermarked image and more robustness against some image processing attacks. Moreover, scheme QR-1 is also more robustness than the scheme based on QR decomposition of Song Wei et.al.
“…Hướng thứ hai: Nhúng dấu thủy vân vào các phần tử trên cột thứ nhất của ma trận U và/hoặc V [3,6]. Ngoài ra, có nhiều nghiên cứu sử dụng đồng thời phân tích SVD với các phép biến đổi ma trận khác như DCT, DWT,… để xây dựng các lược đồ thủy vân kết hợp như trong [2,7,9,10,15].…”
Section: Các Phép Biến đổI Svd (Singular Valueunclassified
In this paper, we propose two watermarking schemes based on QR decomposition, called QR-1 and QR-N. In comparision with watermarking schemes based on SVD decomposition of R. Sun et.al and P. Bao et.al, the proposed schemes have lower computational complexity, higher security, better quality of watermarked image and more robustness against some image processing attacks. Moreover, scheme QR-1 is also more robustness than the scheme based on QR decomposition of Song Wei et.al.
<p>As reported in past decades, gallium nitride as one of the most capable compound semiconductor, GaN-based high-electron mobility transistors are the focus of intense research activities in the area of high power, high-speed, and high-temperature transistors. In this paper we present a design and simulation of the GaN based thin film transistor using sentaurus TCAD for the extracting the electrical performance. The resulting GaN TFTs exhibits good electrical performance in the simulated results, including, a threshold voltage of 12-15 V, an on/off current ratio of 6.5×10<sup>7 </sup>~8.3×10<sup>8</sup>, and a sub-threshold slope of 0.44V/dec. Sentaurus TCAD simulations is the tool which offers study of comprehensive behavior of semiconductor structures with ease. The simulation results of the TFT structure based on gallium nitride active channel have great prospective in the next-generation flat-panel display applications.</p>
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