The filter operator used in normal multichannel matching filter is physically realizable. This filter operator only delays seismic data in the filtering process. A non- causal multichannel matching filter based on a l...The filter operator used in normal multichannel matching filter is physically realizable. This filter operator only delays seismic data in the filtering process. A non- causal multichannel matching filter based on a least squares criterion is proposed to resolve the problem in which predicted multiple model data is later than real data. The differences between causal and non-causal multichannel matching filters are compared using a synthetic shot gather, which demonstrates the validity of the non-causal matching filter. In addition, a variable length sliding window which changes with offset and layer velocity is proposed to solve the count of events increasing with increasing offset in a fixed length sliding window. This variable length sliding window is also introduced into the modified and expanded multichannel matching filter. This method is applied to the Pluto1.5 synthetic data set. The benefits of the non-causal filter operator and variable length sliding window are demonstrated by the good multiple attenuation result.展开更多
Reversible watermarking technique enables to extract embedded information without any loss of the host signal. For the reduction of the embedding distortion, a desirable reversible watermarking approach should exploit...Reversible watermarking technique enables to extract embedded information without any loss of the host signal. For the reduction of the embedding distortion, a desirable reversible watermarking approach should exploit efficient prediction way to generate prediction errors with a smaller magnitude for expansion embedding. In this paper, we present a reversible audio watermarking scheme based on a new non-causal prediction method and embedding strategy. The proposed non-causal prediction method provides non-integer prediction errors and the proposed expansion embedding strategy can proceed them for a lower embedding distortion. Experimental results have shown that the proposed reversible technique has a lower embedding distortion for the same embedding payload in comparison with the existing state-of-the-art works.展开更多
In this paper, using the Guichardet space technique, the relationship between Fermion quantum stochastic calculus and non-causal calculus in Segal space L^2(H) is discussed, and an anticipating quantum stochastic calc...In this paper, using the Guichardet space technique, the relationship between Fermion quantum stochastic calculus and non-causal calculus in Segal space L^2(H) is discussed, and an anticipating quantum stochastic calculus is naturally given.展开更多
The origin of the universe?The origin of free will?The origin of space?Or simply the appearance of something out of nothing,with no causal before,likes a probability that transforms into an unpredictable particle actu...The origin of the universe?The origin of free will?The origin of space?Or simply the appearance of something out of nothing,with no causal before,likes a probability that transforms into an unpredictable particle actuality in quantum physics.In short,does better explanation for such questions await us?Or are we hamstrung by our tendency for“cause-and-effect”explanations or“something vs.nothing”ways of forcing the options?This essay explores the notion of beginnings-that is,the possibility of something from nothing.It begins by clarifying how the meaning of such terms is being intended,for example the question of whether the moon if no one sees it qualifies as a nothing,the question of an uncaused something or an effect minus an antecedent of any kind.In short,what does a something-from-nothing entail?And what is a something in the first place,as Heidegger asks in his essay,“What Is a Thing?”Having sketched out notions of“something”and“nothing”,the discussion proceeds to the central question,namely the possibility of a something from nothing.What is something?What is nothing?It may be that we need new categories of understanding for a better answer.This essay suggests such a quest.展开更多
基金supported by the National 863 Program (Grant No. 2006AA09A102-09)the National 973 Program (GrantNo. 2007CB209606)
文摘The filter operator used in normal multichannel matching filter is physically realizable. This filter operator only delays seismic data in the filtering process. A non- causal multichannel matching filter based on a least squares criterion is proposed to resolve the problem in which predicted multiple model data is later than real data. The differences between causal and non-causal multichannel matching filters are compared using a synthetic shot gather, which demonstrates the validity of the non-causal matching filter. In addition, a variable length sliding window which changes with offset and layer velocity is proposed to solve the count of events increasing with increasing offset in a fixed length sliding window. This variable length sliding window is also introduced into the modified and expanded multichannel matching filter. This method is applied to the Pluto1.5 synthetic data set. The benefits of the non-causal filter operator and variable length sliding window are demonstrated by the good multiple attenuation result.
基金Supported by the National Natural Science Foundation of China (61272414the Science and Technology Project of Guangzhou Province(2012J4100108)the Jinan University Outstanding Postgraduate Research and Innovation Program, Jinan University Outstanding Undergraduate Scientific Research Innovation Cultivation Project
文摘Reversible watermarking technique enables to extract embedded information without any loss of the host signal. For the reduction of the embedding distortion, a desirable reversible watermarking approach should exploit efficient prediction way to generate prediction errors with a smaller magnitude for expansion embedding. In this paper, we present a reversible audio watermarking scheme based on a new non-causal prediction method and embedding strategy. The proposed non-causal prediction method provides non-integer prediction errors and the proposed expansion embedding strategy can proceed them for a lower embedding distortion. Experimental results have shown that the proposed reversible technique has a lower embedding distortion for the same embedding payload in comparison with the existing state-of-the-art works.
文摘In this paper, using the Guichardet space technique, the relationship between Fermion quantum stochastic calculus and non-causal calculus in Segal space L^2(H) is discussed, and an anticipating quantum stochastic calculus is naturally given.
文摘The origin of the universe?The origin of free will?The origin of space?Or simply the appearance of something out of nothing,with no causal before,likes a probability that transforms into an unpredictable particle actuality in quantum physics.In short,does better explanation for such questions await us?Or are we hamstrung by our tendency for“cause-and-effect”explanations or“something vs.nothing”ways of forcing the options?This essay explores the notion of beginnings-that is,the possibility of something from nothing.It begins by clarifying how the meaning of such terms is being intended,for example the question of whether the moon if no one sees it qualifies as a nothing,the question of an uncaused something or an effect minus an antecedent of any kind.In short,what does a something-from-nothing entail?And what is a something in the first place,as Heidegger asks in his essay,“What Is a Thing?”Having sketched out notions of“something”and“nothing”,the discussion proceeds to the central question,namely the possibility of a something from nothing.What is something?What is nothing?It may be that we need new categories of understanding for a better answer.This essay suggests such a quest.
