362 research outputs found
The 1040th Anniversary Celebrations of Yuelu Academy
Introduction of Major Institution
Sketch2Stress: Sketching with Structural Stress Awareness
In the process of product design and digital fabrication, the structural
analysis of a designed prototype is a fundamental and essential step. However,
such a step is usually invisible or inaccessible to designers at the early
sketching phase. This limits the user's ability to consider a shape's physical
properties and structural soundness. To bridge this gap, we introduce a novel
approach Sketch2Stress that allows users to perform structural analysis of
desired objects at the sketching stage. This method takes as input a 2D
freehand sketch and one or multiple locations of user-assigned external forces.
With the specially-designed two-branch generative-adversarial framework, it
automatically predicts a normal map and a corresponding structural stress map
distributed over the user-sketched underlying object. In this way, our method
empowers designers to easily examine the stress sustained everywhere and
identify potential problematic regions of their sketched object. Furthermore,
combined with the predicted normal map, users are able to conduct a region-wise
structural analysis efficiently by aggregating the stress effects of multiple
forces in the same direction. Finally, we demonstrate the effectiveness and
practicality of our system with extensive experiments and user studies.Comment: 16 figure
Sketch Beautification: Learning Part Beautification and Structure Refinement for Sketches of Man-made Objects
We present a novel freehand sketch beautification method, which takes as
input a freely drawn sketch of a man-made object and automatically beautifies
it both geometrically and structurally. Beautifying a sketch is challenging
because of its highly abstract and heavily diverse drawing manner. Existing
methods are usually confined to the distribution of their limited training
samples and thus cannot beautify freely drawn sketches with rich variations. To
address this challenge, we adopt a divide-and-combine strategy. Specifically,
we first parse an input sketch into semantic components, beautify individual
components by a learned part beautification module based on part-level implicit
manifolds, and then reassemble the beautified components through a structure
beautification module. With this strategy, our method can go beyond the
training samples and handle novel freehand sketches. We demonstrate the
effectiveness of our system with extensive experiments and a perceptive study.Comment: 13 figure
CornerFormer: Boosting Corner Representation for Fine-Grained Structured Reconstruction
Structured reconstruction is a non-trivial dense prediction problem, which
extracts structural information (\eg, building corners and edges) from a raster
image, then reconstructs it to a 2D planar graph accordingly. Compared with
common segmentation or detection problems, it significantly relays on the
capability that leveraging holistic geometric information for structural
reasoning. Current transformer-based approaches tackle this challenging problem
in a two-stage manner, which detect corners in the first model and classify the
proposed edges (corner-pairs) in the second model. However, they separate
two-stage into different models and only share the backbone encoder. Unlike the
existing modeling strategies, we present an enhanced corner representation
method: 1) It fuses knowledge between the corner detection and edge prediction
by sharing feature in different granularity; 2) Corner candidates are proposed
in four heatmap channels w.r.t its direction. Both qualitative and quantitative
evaluations demonstrate that our proposed method can better reconstruct
fine-grained structures, such as adjacent corners and tiny edges. Consequently,
it outperforms the state-of-the-art model by +1.9\%@F-1 on Corner and
+3.0\%@F-1 on Edge
Biosorption of malachite green from aqueous solutions by Pleurotus ostreatus using Taguchi method
Dyes released into the environment have been posing a serious threat to natural ecosystems and aquatic life due to presence of heat, light, chemical and other exposures stable. In this study, the Pleurotus ostreatus (a macro-fungus) was used as a new biosorbent to study the biosorption of hazardous malachite green (MG) from aqueous solutions. The effective disposal of P. ostreatus is a meaningful work for environmental protection and maximum utilization of agricultural residues. The operational parameters such as biosorbent dose, pH, and ionic strength were investigated in a series of batch studies at 25°C. Freundlich isotherm model was described well for the biosorption equilibrium data. The biosorption process followed the pseudo-second-order kinetic model. Taguchi method was used to simplify the experimental number for determining the significance of factors and the optimum levels of experimental factors for MG biosorption. Biosorbent dose and initial MG concentration had significant influences on the percent removal and biosorption capacity. The highest percent removal reached 89.58% and the largest biosorption capacity reached 32.33 mg/g. The Fourier transform infrared spectroscopy (FTIR) showed that the functional groups such as, carboxyl, hydroxyl, amino and phosphonate groups on the biosorbent surface could be the potential adsorption sites for MG biosorption. P. ostreatus can be considered as an alternative biosorbent for the removal of dyes from aqueous solutions
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