Article
Optics
Farzana Yasmeen, Michael A. Sutton, Sreehari Rajan, Hubert Schreier, Andrew Campbell
Summary: This study investigates the local strain variability due to inaccuracies in the local unit vectors n, b, and t. The results indicate that the estimated local strains are strongly influenced by the direction of the estimated normal, n.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Computer Science, Software Engineering
Zipeng Ye, Mengfei Xia, Yanan Sun, Ran Yi, Minjing Yu, Juyong Zhang, Yu-Kun Lai, Yong-Jin Liu
Summary: In this paper, a deep neural network model is proposed to generate high-quality 3D caricatures directly from normal 2D face photos. The challenging problem of the significant difference between face photos and 3D caricatures is addressed through a large dataset and novel loss functions based on psychological studies. Experimental results demonstrate the effectiveness of the proposed system.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2023)
Article
Computer Science, Artificial Intelligence
Wei Yin, Yifan Liu, Chunhua Shen
Summary: This work emphasizes the importance of high-order 3D geometric constraints in monocular depth prediction. By introducing a loss term based on virtual normal directions, the accuracy and robustness of depth estimation can be significantly improved. Moreover, this approach disentangles scale information and enriches the model with better shape information. Experimental results demonstrate state-of-the-art performance on various datasets with diverse scenes.
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE
(2022)
Article
Engineering, Multidisciplinary
Byounghun Ye, Ku-Jin Kim, Elisha P. Sacks
Summary: We propose an algorithm for detecting surface defects in 3D printed parts by comparing the 3D mesh of the printout to the CAD model. The algorithm calculates the global deviation of the printout from the model and identifies local defects based on differences in curvature. The results are displayed as grouped local defect regions. We demonstrate the effectiveness of the algorithm using metal printing and PLA 3D printing.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Engineering, Aerospace
Xiangyuan Zeng, Tongge Wen, Ziwen Li, Kyle T. Alfriend
Summary: This article investigates the influence of explicitly refined rocky terrains on the natural landing motion of a cuboid asteroid lander. Numerical simulations and analysis provide guidelines for the lander deployment and rover path planning on rocky asteroids.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Chemistry, Analytical
Huifeng Wu, Lei Liang, Hui Wang, Shu Dai, Qiwei Xu, Rui Dong
Summary: A high-precision shape sensor based on soft substrates and dual FBGs has been designed in this study, achieving high accuracy and reliability in shape reconstruction through optimization of sensor size parameters and adoption of the two FBG cross-laying method.
Article
Mathematics, Applied
Dan Yang, Jinchao Yu, Jingjing Zhang, Xiaoying Zhu
Summary: This paper provides further evidence supporting the conjecture that hypersurfaces in pseudo-Euclidean space with proper mean curvature vector have constant mean curvature. The paper specifically focuses on linear Weingarten hypersurfaces with certain properties in E-s(n+1).
Article
Engineering, Biomedical
Sebastien J. P. Callens, Duncan C. Tourolle ne Betts, Ralph Muller, Amir A. Zadpoor
Summary: This research analyzes the local and global geometry of human trabecular bone through quantifying surface curvatures and Minkowski functionals, showing that curvature density maps provide distinct shape fingerprints for bones from different sites. The Minkowski analysis illustrates that trabecular bone exhibits other types of anisotropy/ellipticity beyond interfacial orientation and that anisotropy varies substantially within the trabecular structure.
ACTA BIOMATERIALIA
(2021)
Article
Ophthalmology
J. Edwin Dickinson, Ken W. S. Tan, David R. Badcock
Summary: The study demonstrates that the visual system tends to perceive the apparent rather than the veridical boundary conformation in shape analysis, leading to misperception of object boundary positions. This misperception may be induced by orientation context and motion-induced positional bias. These two types of illusions occur independently, but the misperception of position is additive.
Article
Mechanics
Zhiqiang Gao, Yunpeng Xi, Lixia Peng, Weiping Fu, Wen Wang, Weipeng Hu, Xian Wei
Summary: This paper proposes contact models considering the effects of surface roughness and lubrication viscosity on the normal and tangential contact performances of mixed lubrication. By analyzing the contact performance between solid and liquid parts based on statistical theory, elastic-plastic theory, and hydrodynamics theory, the key influencing factors are revealed. The main contribution of this work is providing guidance on improving the contact performances of mechanical interfaces.
Article
Mathematics, Applied
Gang Hu, Junli Wu, Xiaofeng Wang
Summary: The paper presents a class of methods to construct local controlled developable H-Bezier surfaces through a given characteristic curve, introducing generalized cubic H-Bezier basis functions and deriving sufficient and necessary conditions for the interpolating developable H-Bezier surface to be a cylinder or a cone. Representative examples are provided to illustrate the convenience and efficiency of the presented methods.
COMPUTATIONAL & APPLIED MATHEMATICS
(2021)
Article
Engineering, Geological
F. Altuhafi, B. A. Baudet, M. R. Coop
Summary: The validity of different contact models for artificially shaped granite stones was tested against experimental data. It was found that models considering surface roughness and fractality provided a better representation of the data, but their validity seems to be limited to before excessive plastic deformations occur.
Article
Computer Science, Artificial Intelligence
Jose M. Navarro-Jimenez, Jose Aguado, Gregoire Bazin, Vicente Albero, Domenico Borzacchiello
Summary: This study proposes a method for fast digitization using partial scans and statistical shape analysis. By extracting a low-dimensional description of shape variability and reconstruction algorithm, accurate and complete digitization can be achieved. The tests conducted on aeronautical fuselage panels showed an 80% reduction in digitization time while maintaining high precision.
JOURNAL OF INTELLIGENT MANUFACTURING
(2023)
Article
Computer Science, Interdisciplinary Applications
Desir-Andre Koffi Bi, Mathilde Tavares, Eric Chenier, Stephane Vincent
Summary: In this work, three classes of numerical methods are investigated for evaluating interface properties in multiphase flow simulations. The accuracy, robustness, and convergence properties of these methods are studied through comparisons on static and dynamic surfaces. The most appropriate method can be chosen based on the desired accuracy and computational cost.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Aerospace
Damu Murali, Ajith Kumar Raghavan, Ajith Kumar Sasidharanpillai
Summary: Visualization experiments were conducted in a water channel to study the wake vortex characteristics of flat plates and convex and concave curved plates, revealing the significant effects of curvature and orientation on vortex shedding frequency, vortex shrinkage, and vortex length. The combined effect of curvature and orientation on convex plates was found to enhance vortex shedding frequency significantly, while concave surfaces were observed to be more suitable for stretching vortices downstream.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
