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- 저자 : Tianying Xu (검색결과 2 건)
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A Geometric Errors Identification Method for the Rotating Axis of Five-Axis Welding Equipment
Xianxing Tang,Haibo Zhou,Tianying Xu 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.8
This paper deals with the problems of high detection cost and low detection efficiency in geometric errors identification of five-axis welding equipment, proposing a new method for rotating axis equipment, based on screw theory and monocular vision. In this paper, a low-cost and high-precision pose measurement method is first proposed, while the screw theory is used to establish a kinematics model for five-axis welding equipment. Furthermore, an identification method for the kinematics parameters and geometric errors of the rotating axis is proposed. In order to verify the validity and feasibility of the proposed identification scheme, the high detection accuracy of the pose detection system is first verified. Following, the significant improvement of the motion accuracy, after geometric errors identification, is verified, based on sampling within the working range of the five-axis welding equipment. The experimental results show that, the average value of the relative direction error of the five-axis welding equipment is reduced from 0.5427°, prior to identification, to 0.0478°, post identification, while the average value of the relative position error is reduced from 0.1472 to 0.0174 mm, respectively. Therefore, the identification scheme is proven can effective in identifying the geometric errors for the rotating axis, while it significantly improves the motion accuracy of the five-axis welding equipment.
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Border Control—A Membrane-Linked Interactome of <i>Arabidopsis</i>
Jones, Alexander M.,Xuan, Yuanhu,Xu, Meng,Wang, Rui-Sheng,Ho, Cheng-Hsun,Lalonde, Sylvie,You, Chang Hun,Sardi, Maria I.,Parsa, Saman A.,Smith-Valle, Erika,Su, Tianying,Frazer, Keith A.,Pilot, Guillaum American Association for the Advancement of Scienc 2014 Science Vol.344 No.6185
<P>Cellular membranes act as signaling platforms and control solute transport. Membrane receptors, transporters, and enzymes communicate with intracellular processes through protein-protein interactions. Using a split-ubiquitin yeast two-hybrid screen that covers a test-space of 6.4 x 10(6) pairs, we identified 12,102 membrane/signaling protein interactions from Arabidopsis. Besides confirmation of expected interactions such as heterotrimeric G protein subunit interactions and aquaporin oligomerization, >99% of the interactions were previously unknown. Interactions were confirmed at a rate of 32% in orthogonal in planta split-green flourescent protein interaction assays, which was statistically indistinguishable from the confirmation rate for known interactions collected from literature (38%). Regulatory associations in membrane protein trafficking, turnover, and phosphorylation include regulation of potassium channel activity through abscisic acid signaling, transporter activity by a WNK kinase, and a brassinolide receptor kinase by trafficking-related proteins. These examples underscore the utility of the membrane/signaling protein interaction network for gene discovery and hypothesis generation in plants and other organisms.</P>
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