Starting from the tremendous fascination with images of 9/11, Karen Engle asks what, in the context of a national trauma, makes an image appropriate or scandalous, exploring how diverse visual media ...have been mobilized in political projects of identification and personal narratives of empathy. Focusing on themes of memory, mourning, and history, Engle examines sculptural, photographic, and new media responses to the 9/11 attacks in both contemporary and historical contexts, considers the public's reaction to these visual productions, and suggests that earlier presentations of America at war play a pivotal role in the representations of 9/11 in both official and popular media.
The log-sum function as a penalty has always been drawing widespread attention in the field of sparse problems. However, it brings a non-convex, non-smooth and non-Lipschitz optimization problem that ...is difficult to tackle. To overcome the problem, an iterative threshold algorithm for the sparse optimization problems with log-sum function is proposed in this paper. For brevity, the sparse optimization problems with log-sum function are named log-sum regularization. Firstly, by introducing an intermediate function to construct another new function, a property theorem about solution for log-sum regularization is established. Secondly, based on the above theorem, the optimal setting rules of the compromising parameters are elaborated, and an iterative log-sum threshold algorithm is proposed. Thirdly, under the situation that the compromising parameters of log-sum regularization are relatively small, it can be proven that the proposed algorithm converges to a local minimizer of log-sum regularization. Finally, a series of simulations are implemented to examine performance of the proposed algorithm, and the results exhibit that the proposed algorithm outperforms the state-of-the-art algorithms.
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September 11th, 2001 remains a focal point of American consciousness, a site demanding ongoing excavation, a site at which to mark before and after “everything” changed. In ways both real and ...intangible the entire sequence of events of that day continues to resonate in an endlessly proliferating aftermath of meanings that continue to evolve. Presenting a collection of analyses by an international body of scholars that examines America's recent history, this book focuses on popular culture as a profound discursive site of anxiety and discussion about 9/11 and demystifies the day's events in order to contextualize them into a historically grounded series of narratives that recognizes the complex relations of a globalized world. Essays in Reframing 9/11 share a collective drive to encourage new and original approaches for understanding the issues both within and beyond the official political rhetoric of the events of the “The Global War on Terror” and issues of national security.
