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The emergence of low-cost 3D printers steers the investigation of new geometric problems that control the quality of the fabricated object. In this paper, we present a method to reduce the material cost and weight of a given object while providing a durable printed model that is resistant to impact and external forces. We introduce a hollowing optimization(More)
We pose the <i>decompose-and-pack</i> or <i>DAP</i> problem, which tightly combines shape decomposition and packing. While in general, DAP seeks to decompose an input shape into a <i>small number</i> of parts which can be <i>efficiently</i> packed, our focus is geared towards 3D printing. The goal is to optimally decompose-and-pack a 3D object into a(More)
Do short periods of relatively low temperatures during winter in subtropical zones promote seed dormancy break and germination of alien species and thus facilitate their spread? To help answer this question, we tested the germination responses to moist storage at low temperatures of seeds of 21 alien species from southeastern China. For each species, fresh(More)
A Graph-optimized Linear Discriminant Analysis (GLDA) for face recognition is proposed, which redefine the intrinsic and penalty graph and trade off the importance degrees of the same-class points to the intrinsic graph and the importance degrees of the not-same-class points to the penalty graph by a strictly monotone decreasing function. Experiments on(More)
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