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Measurement of Global Sizes of Cylinder Based on Spiral Profile Extraction Strategy
Xinyu Zhao,Jianpu Xi,Zexiang Zhao,Xinchao Shi,Shuaifei Wang 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.8
The single spiral profile and the single spiral-double roundness profiles extraction strategies of cylindrical feature were promoted. According to the definitions of cylinder’s global sizes, their evaluation models were established based on two extraction strategies. The axis parameters of the reference cylindrical surface for two extraction strategies were determined by using the artificial ecosystem-based optimization algorithm, the program flowchart of which was given. Through the profiles’ extraction of one sample and evaluation of global sizes, the correctness of the established evaluation models and the availability of the developed program were verified. The optimal eigenvalues of nine optimization algorithms showed that the artificial ecosystem-based optimization algorithm is one of the optimization algorithms suitable for evaluating cylinder’s global sizes.
Surveillant: a supervision mechanism between blockchains for efficient cross-chain verification
Xinyu Liang,Jing Chen,Ruiying Du,Tianrui Zhao 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.8
Blockchain interoperability, which refers in particular to the ability to access information across blockchain systems, plays the key role for different blockchains to communicate with each other, and further supports the superstructure built on top of the cross-chain mechanism. Nowadays, blockchain interoperability technology is still in its infancy. The existing cross-chain scheme such as BTCRelay requires that the smart contract in a blockchain to download and maintain block headers of the other blockchain, which is costly in maintenance and inefficient to use. In this paper, we propose a supervision mechanism between blockchains, called Surveillant. Specially, the new entities called dual-functional nodes are introduced to commit the real-time information from the blockchain under supervision to the supervising blockchain, which enables users to have efficient cross-chain verification. Furthermore, we introduce Merkle mountain range for blocks aggregation to deal with the large-scale committing data. We propose the design of long orphan branch counter to trace the bifurcations in the blockchain under supervision. The existing incentive mechanism is improved to encourage the behaviors of dual-functional nodes. In Surveillant, the analysis and experimental results demonstrate that users are able to have efficient cross-chain verification with low maintenance overhead.
Xinyu Zhao,송성진,김학준,Tie Gang,Suk-Chull Kang,Yong Hwan Choi,Kyungcho Kim,Sung-Sik Kang 한국비파괴검사학회 2007 한국비파괴검사학회지 Vol.27 No.3
Ultrasonic inspection of austenitic steel weldments is a truly difficult task due to complicated wave propagation phenomena such as beam skewing, splitting and distortion. In order to understand these phenomena and design proper inspection procedures, simulation is increasingly paid more attention to. This article addresses a ray tracing based approach to determine incident angle and position of optimal wave mode ultrasonic beam for flaw detection in anisotropic and inhomogeneous austenitic steel weldments. Specially, the optimal mode of ultrasonic wave wave is selected by ray tracing simulation, and an optimization approach based on ray tracing and bi-section search is proposed in order to find the ray path connecting two given points in weldments. With help of this approach, the optimal incident angle and position of ultrasonic beam can be determined for a given flaw position.
Zhao, Xinyu,Song, Sung-Jin,Kim, Hak-Joon,Gang, Tie,Kang, Suk-Chull,Choi, Yong-Hwan,Kim, Kyung-Cho,Kang, Sung-Sik The Korean Society for Nondestructive Testing 2007 한국비파괴검사학회지 Vol.27 No.3
Ultrasonic inspection of austenitic steel weldments is a truly difficult task due to complicated wave propagation phenomena such as beam skewing, splitting and distortion. In order to understand these phenomena and design proper inspection procedures, simulation is increasingly paid more attention to. This article addresses a ray tracing based approach to determine incident angle and position of optimal wave mode ultrasonic beam for flaw detection in anisotropic and inhomogeneous austenitic steel weldments. Specially, the optimal mode of ultrasonic wave wave is selected by ray tracing simulation, and an optimization approach based on ray tracing and bi-section search is proposed in order to find the ray path connecting two given points in weldments. With help of this approach, the optimal incident angle and position of ultrasonic beam can be determined for a given flaw position.
Xinyue Zhu,Yaping Zhao,Yifei Chi,Gongfa Li,Xinyuan Chen 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.3
The main purpose of this article is to determine the processing parameters of the worm and establish the theory of the meshing limit line of toroidal surface enveloping cylindrical worm drive with the arc-toothed worm. Based on this condition that the instantaneous contact line is a planar curve during grinding the worm blank, it can be deduced that its torsion is equal to zero, then the formulae which determine the installing position of the grinding wheel are acquired. Following this, the equations of the tooth surfaces and the meshing limit function are all obtained. According to the geometric construction and elimination method, the meshing limit points are determined by iteratively solving the corresponding nonlinear equation in its solution domain. In addition, the result of the numerical case demonstrates that the worm helicoid is divided into two parts by the meshing limit line, which makes the working length of the worm cannot reach half of its total thread length. And by adjusting the design parameters of the worm pair and the processing parameters of the worm, the meshing limit line cannot be eliminated and its position on the surfaces of the worm and the worm gear has no notable change.
Xinyu Peng,Dong Ye,Guo Zheng Zhao,Qi Zhao,Minmin Song 한국광학회 2017 Current Optics and Photonics Vol.1 No.2
It is shown that polarization singularities of a new type, namely U and P singularities, arise at thetransverse cross section of a partially coherent beam, instead of the common singularities such as C pointsand L lines in a completely coherent vector field. A relationship between the two kind of singularitieswith respect to intensity is proposed. We also present a setup that can generate the new singularities, andany desired distribution of degree of polarization, using intensity control.
Opportunistic Routing for Bandwidth-Sensitive Traffic in Wireless Networks with Lossy Links
Zhao, Peng,Yang, Xinyu The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5
Opportunistic routing (OR) has been proposed as a viable approach to improve the performance of wireless multihop networks with lossy links. However, the exponential growth of the bandwidth-sensitive mobile traffic (e.g., mobile video streaming and online gaming) poses a great challenge to the performance of OR in term of bandwidth guarantee. To solve this problem, a novel mechanism is proposed to opportunistically forwarding data packets and provide bandwidth guarantee for the bandwidth-sensitive traffic. The proposal exploits the broadcast characteristic of wireless transmission and reduces the negative effect of wireless lossy links. First, the expected available bandwidth (EAB) and the expected transmission cost (ETC) under OR are estimated based on the local available bandwidth, link delivery probability, forwarding candidates, and prioritization policy. Then, the policies for determining and prioritizing the forwarding candidates is devised by considering the bandwidth and transmission cost. Finally, bandwidth-aware routing algorithm is proposed to opportunistically delivery data packets; meanwhile, admission control is applied to admit or reject traffic flows for bandwidth guarantee. Extensive simulation results show that our proposal consistently outperforms other existing opportunistic routing schemes in providing performance guarantee.
An Empirical Study on the Impact of Trade Facilitation on China's Export Trade
Xinyu ZHAO,Fan ZHANG 한국유통과학회 2020 The Journal of Industrial Distribution & Business( Vol.11 No.9
Purpose: Many studies show that promoting the development of trade facilitation has a positive role in stimulating the country's foreign trade. Therefore, it is of great practical significance to study the development level of trade facilitation for China's export trade. Research design, data and methodology:This study analyzes the growth trend of China's export trade volume in 2009-2019, the characteristics of China's export trade market according to the top 18 major exporting countries in 2017-2018, the structure of export commodities to understand China's economic development level, and compares the total amount of trade exported to all uses this to measure the level of trade development. On this basis, this paper selects the 2011-2018 Trade Facilitation Index and C continents to study the development trend. Based on the theory of trade facilitation, this paper constructs the Trade Facilitation Index, and hina's export trade volume for empirical research. Results: The results show that trade facilitation has a positive and significant impact on the development of China's export trade. Conclusions: Based on the analysis of the actual situations and empirical results, this paper puts forward some suggestions to promote the level of trade facilitation in order to promote the development of import and export trade
Xylazole inhibits NO-cGMP pathway in fetal rat nerve cells
Xinyu Wang,Yue Wu,Lin Liu,Hui Bai,Zhiheng Zhang,Mingchao Zhao,Tianwen Ma,Xiaopeng Song,Lina Jia,Liangyu Lv,Yue Yu,Xinyu Xu,Hong Chen,Li Gao 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.1
Background: Xylazole (Xyl) is a veterinary anesthetic that is structurally and functionally similar to xylazine. However, the effects of Xyl in vitro remain unknown. Objectives: This study aimed to investigate the anesthetic mechanism of Xyl using fetal rat nerve cells treated with Xyl. Methods: Fetal rat nerve cells cultured for seven days were treated with 10, 20, 30, and 40 μg/ mL Xyl for 0, 5, 10, 15, 20, 25, 30, 45, 60, 90, and 120 min. Variations of amino acid neurotransmitters (AANTs), Nitric oxide-Cyclic GMP (NO-cGMP) signaling pathway, and ATPase were evaluated. Results: Xyl decreased the levels of cGMP and NO in nerve cells. Furthermore, Xyl affected the AANT content and Na+-K+-ATPase and Ca2+-Mg2+-ATPase activity in nerve cells. These findings suggested that Xyl inhibited the NO-cGMP signaling pathway in nerve cells in vitro. Conclusions: This study provided new evidence that the anesthetic and analgesic effects of Xyl are related to the inhibition of the NO-cGMP signaling pathway.