Autofocus method based on the analysis of image content information is investigated to reduce the alignment error resulting from mark positioning uncertainty due to defocus in microstructure layered fabrication proces...Autofocus method based on the analysis of image content information is investigated to reduce the alignment error resulting from mark positioning uncertainty due to defocus in microstructure layered fabrication process based on multilevel imprint lithography. The applicability of several autofocus functions to the alignment mark images is evaluated concerning their uniformity, sharpness near peak, reliability and measure computation efficiency and the most suitable one based on power spectrum in frequency domain (PSFD) is adopted. To solve the problem of too much computation amount needed in PSFD algorithm, the strategy of interested region detection and effective image reconstruction is proposed and the algorithm efficiency is improved. The test results show that the computation time is reduced from 0.316 s to 0.023 s under the same conditions while the other merits of the function are preserved, which indicates that the modified algorithm can meet the mark image autofocusing requirements in response time, accuracy and robustness. The alignment error due to defocus which is about 0.5 μm indicated by experimental results can be reduced or eliminated by the autofocusing implementation.展开更多
Apocalypse Now is a 1979 American epic war film set during the Vietnam War, directed and produced by Francis Ford Coppola. It was originally adapted from the novella Heart of Darkness （1902）, which was written in th...Apocalypse Now is a 1979 American epic war film set during the Vietnam War, directed and produced by Francis Ford Coppola. It was originally adapted from the novella Heart of Darkness （1902）, which was written in the colonial era. Apocalypse Now Redux （2001） is a refined version of the 1979 edition. In previous researches, most scholars only focused on either of the two adapted versions in terms of thematic discussion and narrative analysis, which have ignored the significance of the evolution of the film and the changing historical contexts. Accordingly, on the basis of narrative theory and cultural study, the thesis makes a narrative analysis of the evolution of Apocalypse Now Redux （2001）. It indicates that through some newly-inserted narrative elements in Apocalypse Now Redux （2001）, more attention is paid to minority groups, darkness in war and media quagmire, which is related to different historical and political contexts and endeavors to remind the American public of the harsh lesson of Vietnam War in the 20th century. However, efforts to restraint the war seem to be ineffective, which is fully exemplified by Iraq War in 2003展开更多
基金Supported by National Natural Science Foundation of China (No50305026)Open Foundation of Guangxi Key Lab for Manufacturing Systems and Advanced Manufacturing Technology (No07109008-025-K)
文摘Autofocus method based on the analysis of image content information is investigated to reduce the alignment error resulting from mark positioning uncertainty due to defocus in microstructure layered fabrication process based on multilevel imprint lithography. The applicability of several autofocus functions to the alignment mark images is evaluated concerning their uniformity, sharpness near peak, reliability and measure computation efficiency and the most suitable one based on power spectrum in frequency domain (PSFD) is adopted. To solve the problem of too much computation amount needed in PSFD algorithm, the strategy of interested region detection and effective image reconstruction is proposed and the algorithm efficiency is improved. The test results show that the computation time is reduced from 0.316 s to 0.023 s under the same conditions while the other merits of the function are preserved, which indicates that the modified algorithm can meet the mark image autofocusing requirements in response time, accuracy and robustness. The alignment error due to defocus which is about 0.5 μm indicated by experimental results can be reduced or eliminated by the autofocusing implementation.
文摘Apocalypse Now is a 1979 American epic war film set during the Vietnam War, directed and produced by Francis Ford Coppola. It was originally adapted from the novella Heart of Darkness （1902）, which was written in the colonial era. Apocalypse Now Redux （2001） is a refined version of the 1979 edition. In previous researches, most scholars only focused on either of the two adapted versions in terms of thematic discussion and narrative analysis, which have ignored the significance of the evolution of the film and the changing historical contexts. Accordingly, on the basis of narrative theory and cultural study, the thesis makes a narrative analysis of the evolution of Apocalypse Now Redux （2001）. It indicates that through some newly-inserted narrative elements in Apocalypse Now Redux （2001）, more attention is paid to minority groups, darkness in war and media quagmire, which is related to different historical and political contexts and endeavors to remind the American public of the harsh lesson of Vietnam War in the 20th century. However, efforts to restraint the war seem to be ineffective, which is fully exemplified by Iraq War in 2003
