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- 저자 : Yiwen Cao (검색결과 5 건)
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Distance Estimation Methods in Vehicular Application: An Experimental Study
Yiwen Cao,Xinglong Lu,Zhonghua Zhao,Xiaojun Ji,Yilin Yan 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
Passive Entry and Passive Start (PEPS) system allows drivers to enter the vehicle and start the engine without activating key fob. With growing demand for location-based service and rapid development of Bluetooth Low Energy (BLE), BLE PEPS with localization service becomes a promising choice for next generation of PEPS. This paper studies the critical problem of localizing the vehicle for user based on BLE received signal strength (RSS) provided by preinstalled BLE Access Points (APs) inside vehicle. Multiple APs are employed to reduce the error caused by RSS fluctuation on distance estimation. Fusion algorithms including Extended Kalman Filter, Monte Carlo Localization and Iterative Trilateration are compared based on experiments in vehicle. Experimental results show that distance estimation based on Extended Kalman Filter gets high accuracy in both long distance and short distance scenario.
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Jifeng Cao,Yiwen Cui 한국증권학회 2023 Asia-Pacific Journal of Financial Studies Vol.52 No.3
An implicit tax is a reduction in the pretax rate of return driven by tax preferences. With increasingly stringent requirements of sustainable development, Chinese government actively promotes environmental protection with the direct corporate income tax rate preferences, which provide a unique opportunity to examine whether implicit taxes remain a significant tax cost in the environmental protection industry. This paper finds the existence of implicit taxes in environmental protection firms and the market structure impedes the realization of implicit taxes. The market power and market concentration reduce the negative effect of tax preferences on the firm’s pretax rate of return. The environmental protection firms with lower competition bear lower implicit taxes. These findings are important to evaluate the effectiveness of the tax incentives on environmental protection firms and other tax-favored industries.
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Alariqi Muna,Wei Hao,Cheng Junqi,Sun Yiwen,Zhu Hanyue,Wen Tianwang,Li Yapei,Wu Chenglin,Jin Shuangxia,Cao Jinglin 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.6
Tobacco bacterial wilt caused by Ralstonia solanacearum invades tobacco plants during the whole growth period afecting yield and quality. However, the transcriptome profling of tobacco plant in response to bacterial wilt has not been well studied. In this study, we identifed the transcriptional profles of bacterial wilt-resistant (ac Yanyan97) and -susceptible (ac Honghuadajinyuan) tobacco cultivars infected with R. solanacearum at six time points by RNA sequencing. Gene expression analysis showed that the resistant cultivar manifested a faster change in the expression of defense-related genes than the susceptible cultivar during R. solanacearum infection, by which more diferentially expressed genes (DEGs) were up-regulated rather than down-regulated at all time points. Functional analysis indicated that DEGs were involved in plant hormones, glutathione and secondary metabolic pathways associated with tobacco resistance to bacterial wilt induced by R. solanacearum. Through subsequent Short Time-series Expression Miner (STEM) and weighted correlation network (WGCNA) analyses, the phenylpropanoid metabolic pathway was identifed as a key pathway for tobacco defense against R. solanacearum infestation. In summary, our results provide transcriptomic profles of tobacco response to R. solanacearum infestation
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Measurement of Spindle Tilt Error based on Interference Fringe
Pengqiang Fu,Yinhong Jiang,Lijie Zhou,Yiwen Wang,Qinghui Cao,Qiang Zhang,Feihu Zhang 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.5
The spindle rotation error is one of the important factors that affect the precision of the machined parts. The study of spindle rotation error is of great significance for finding the source of error, predicting the surface shape error of machining parts and improving the machining accuracy of ultra-precision machine tools. The structural of the aerostatic spindle this article focuses on is motorized spindle and the spindle tilt error has the maximum effect on the machining precision. A new method for measuring the rotation error of ultra-precision aerostatic spindle based on interference fringes is proposed in this paper. By using the principle of phase shifting interferometry, the mathematical model between the shape of interference fringes and the motion law of the spindle rotor is established by theoretical modeling. The interference fringes are processed with gray, smooth filtering, expansion corrosion, and edge detection and so on. The distance and direction of the interference fringes are calculated in the coordinate system, so as to get the spindle tilt error. Finally, the measurement system for the spindle rotation error of the aerostatic spindle is developed. The accuracy and effectiveness of this method are shown based on the experimental results.
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Kai Yang,Jie Pan,Ziyang Cao,Yiwen Zhu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.4
The hole-making mechanism of carbon fiber reinforced plastic (CFRP)/titanium alloy stacks is different from that of monolayer materials. In order to reveal the effects of different cutting sequence strategies on the hole-making quality and machining efficiency of the stacked materials, valuable insights are provided for the design of the stacking machining process and the selection of the most suitable cutting sequence. The researchers conducted ultrasonic vibration-assisted helical milling and conventional helical milling experiments with different milling parameters, and explored the basic influence mechanisms of CFRP → Ti and Ti → CFRP on the hole-making in both ways. The results show that different cutting sequences have significant effects on the axial force and chip morphology changes during CFRP/Ti stack machining. The dimensional accuracy and consistency of the holes cut from the Ti side are better, and the quality of the entrance and exit from the Ti side under the ultrasonically assisted condition is close to the quality level of the holes cut from the CFRP side under the normal helical milling, and the ultrasonically assisted condition plays a good role in improving the quality of the holes made. In addition, the tearing coefficients of CFRP hole entry/exit in both machining modes increased with the increase of feed per tooth in tangential direction and decreased with the increase of spindle speed. The tearing coefficients of entry/exit holes in CFRP direction were smaller than those in titanium direction.
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