5,407 research outputs found
PointAtrousGraph: Deep Hierarchical Encoder-Decoder with Point Atrous Convolution for Unorganized 3D Points
Motivated by the success of encoding multi-scale contextual information for
image analysis, we propose our PointAtrousGraph (PAG) - a deep
permutation-invariant hierarchical encoder-decoder for efficiently exploiting
multi-scale edge features in point clouds. Our PAG is constructed by several
novel modules, such as Point Atrous Convolution (PAC), Edge-preserved Pooling
(EP) and Edge-preserved Unpooling (EU). Similar with atrous convolution, our
PAC can effectively enlarge receptive fields of filters and thus densely learn
multi-scale point features. Following the idea of non-overlapping max-pooling
operations, we propose our EP to preserve critical edge features during
subsampling. Correspondingly, our EU modules gradually recover spatial
information for edge features. In addition, we introduce chained skip
subsampling/upsampling modules that directly propagate edge features to the
final stage. Particularly, our proposed auxiliary loss functions can further
improve our performance. Experimental results show that our PAG outperform
previous state-of-the-art methods on various 3D semantic perception
applications.Comment: 11 pages, 10 figure
Environmental features of Chinese architectural heritage: the standardization of form in the pursuit of equilibrium with nature
We present a scientific discussion about Chinese historical architecture and cultural paradigms in order to analyze the formation of building patterns objectively connected to environmental features. In this regard, we will demonstrate the process of standardization from architectural modules related in different levels of composition around “voids”, onto cosmological urban tissues in harmony with nature. The conclusions show that we can only understand Chinese architectural patterns in relation to Dào or nature, and in turn, they possess profound social and environmental values from which we receive useful lessons to advance towards sustainability in architecture and urban planning. The authors believe that it is critical for China and the world to find a new approach to the building construction industry with an ecological and philosophical background recognizable as “Chinese” and based in its own past. In order to support the information provided in the first part of the article, the authors have conducted an environmental analysis of the traditional Chinese urban layout whose results greatly confirm the initial hypotheses, i.e. the historical fashion of constructing neighborhoods improves conditions of the town in terms of comfort and is able to save energy, thus reducing pernicious change effects
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