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Application of v-shaped magnet in inner surface polishing of tubes
Yaoming Zhang,Wen Jia,Yan Chen 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Compared to traditional polishing processes, the magnetic grinding method allows relatively easy polishing of the inner surface of tube fittings. For more than 7 mm thickness SUS304 tubes, the magnetic abrasive grains are subject to a small magnetic force and grinding pressure, leading to the low polishing efficiency. Therefore, a new magnetic grinding and polishing method is proposed, in which the grooved V-shaped magnet is conductive to spontaneous mixing and stirring with magnetic abrasive grains, allowing them continually being replaced for inner surfaces polishing on the tube. This can increase the grinding pressure of abrasive grains to the inner surface and contribute to high-quality surface polishing. Theoretically, it was proved that the grooved V-shaped magnet-assisted polishing tool improves the uniformity of material cutting force in the polishing process. Finally, this method was validated by the experiment with the 7 mm thickness SUS304 tube.
Distributed and Real-time Integrated Simulation System on Avionics
Yaoming Zhou,Yaolong Liu,Shaowei Li,Yuhong Jia 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.3
In order to achieve iterative design in early R&D period, a Distributed and Real-time Integrated Simulation System for avionics based on a Model-Based Systems Engineering (MBSE) method is proposed. The proposed simulation system includes driver, simulation model, monitor, flight visual model and aircraft external model. The effect of this simulation system in iterative design and system verification is testified by several use cases. The result shows that the simulation system, which can play an important role in iterative design and system verification, can reduce project costs and shorten the entire R&D period.
Removal of heat stable salts (HSS) from spent alkanolamine wastewater using electrodialysis
Yaoming Wang,Wei Li,Haiyang Yan,Tongwen Xu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
The formation of heat stable salts (HSS) is a tough problem for aqueous alkanolamines solution in gasprocessing industry. In this study, a self-made electrodialysis stack was assembled to remove the HSSfrom spent amine wastewater. Results indicated that the optimum current density is 15 mA/cm2. Anincrease in pH is beneficial for amine recovery but is harmful to the lifespan of membranes. The EDprocess cost is estimated to be 14.6 $/t with the energy consumption of 39.4 kWh/T. Comparison with theconventional neutralization or replacement methods, ED is not only energy-saving but alsoenvironmentally friendly for the removal of HSS from the spent amine wastewater.
Global maximal estimate to some oscillatory integrals
Yaoming Niu,Ying Xue 대한수학회 2018 대한수학회보 Vol.55 No.2
Under the symbol $\Omega$ is a combination of $\phi_{i}$ ($i=1,2,3,\ldots, n$) which has a suitable growth condition, for dimension $n=2$ and $n\geq3,$ when the initial data $f$ belongs to homogeneous Sobolev space, we obtain the global $L^{q}$ estimate for maximal operators generated by operators family $\{S_{t,\Omega}\}_{t\in\mathbb{R}} $ associated with solution to dispersive equations, which extend some results in \cite{Sjolin8}.
Estimates for Schr\"{o}dinger maximal operators along curve with complex time
Yaoming Niu,Ying Xue 대한수학회 2020 대한수학회지 Vol.57 No.1
In the present paper, we give some characterization of the $L^{2}$ maximal estimate for the operator $P_{a,\gamma}^{t}f\big(\Gamma(x,t)\big)$ along curve with complex time, which is defined by $$P_{a,\gamma}^{t}f\big(\Gamma(x,t)\big) =\int_{\mathbb{R}} e^{i\Gamma(x,t)\xi}e^{it|\xi|^{a}} e^{-t^{\gamma}|\xi|^{a}} \hat{f}(\xi)d\xi,$$ where $t,\gamma>0$ and $a\geq2,$ curve $\Gamma$ is a function such that $\Gamma:\mathbb{R}\times[0,1]\rightarrow\mathbb{R},$ and satisfies H\"{o}lder's condition of order $\sigma$ and bilipschitz conditions. The authors extend the results of the Schr\"{o}dinger type with complex time of Bailey \cite{Bailey} and Cho, Lee and Vargas \cite{CLV} to Schr\"{o}dinger operators along the curves.
ESTIMATES FOR SCHRÖDINGER MAXIMAL OPERATORSALONG CURVE WITH COMPLEX TIME
Niu, Yaoming,Xue, Ying Korean Mathematical Society 2020 대한수학회지 Vol.57 No.1
In the present paper, we give some characterization of the L<sub>2</sub> maximal estimate for the operator P<sup>t</sup><sub>a,γ</sub>f(Γ(x, t)) along curve with complex time, which is defined by $$P^t_{a,{\gamma}}f({\Gamma}(x,t))={\displaystyle\smashmargin{2}{\int\nolimits_{\mathbb{R}}}}\;e^{i{\Gamma}(x,t){\xi}}e^{it{\mid}{\xi}{\mid}^a}e^{-t^{\gamma}{\mid}{\xi}{\mid}^a}{\hat{f}}({\xi})d{\xi}$$, where t, γ > 0 and a ≥ 2, curve Γ is a function such that Γ : ℝ×[0, 1] → ℝ, and satisfies Hölder's condition of order σ and bilipschitz conditions. The authors extend the results of the Schrödinger type with complex time of Bailey [1] and Cho, Lee and Vargas [3] to Schrödinger operators along the curves.
GLOBAL MAXIMAL ESTIMATE TO SOME OSCILLATORY INTEGRALS
Niu, Yaoming,Xue, Ying Korean Mathematical Society 2018 대한수학회보 Vol.55 No.2
Under the symbol ${\Omega}$ is a combination of ${\phi}_i$ ($i=1,2,3,{\ldots},n$) which has a suitable growth condition, for dimension n = 2 and $n{\geq}3$, when the initial data f belongs to homogeneous Sobolev space, we obtain the global $L^q$ estimate for maximal operators generated by operators family $\{S_{t,{\Omega}}\}_{t{\in}{\mathbb{R}}}$ associated with solution to dispersive equations, which extend some results in [27].
Distributed and Real-time Integrated Simulation System on Avionics
Zhou, Yaoming,Liu, Yaolong,Li, Shaowei,Jia, Yuhong The Korean Society for Aeronautical and Space Scie 2017 International Journal of Aeronautical and Space Sc Vol.18 No.3
In order to achieve iterative design in early R&D period, a Distributed and Real-time Integrated Simulation System for avionics based on a Model-Based Systems Engineering (MBSE) method is proposed. The proposed simulation system includes driver, simulation model, monitor, flight visual model and aircraft external model.The effect of this simulation system in iterative design and system verification is testified by several use cases. The result shows that the simulation system, which can play an important role in iterative design and system verification, can reduce project costs and shorten the entire R&D period.
Research on Starting Clutch Control Strategy of Unmanned Helicopter
Zhou Yaoming,Zhang Lei,Xu Hongzhe,Wu Zhe 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
A method is explored to realize automatic control of starting clutch. The clutch control requirements are determined based on the dynamics characteristics research of an unmanned helicopter clutch, and the analysis of clutch engagement process effect on transmission impact and belts life. The rotating speed of clutch driving pulley and driven pulley are selected as basic input parameters. The starting clutch engagement control is divided into three stages. The three stages are fast engagement before rotor rotates, slow engagement and fast engagement after synchronization in turn. Subsection algorithm is adopted in fast engagement before rotor rotates. PID algorithm is adopted in slow engagement. The automatic control of starting clutch engagement at various operating conditions is realized in this way. The experimental results indicate that this control strategy can fit the changes of clutch parameters. It is proved that this clutch control strategy has met the autonomous control requirements of unmanned helicopter.
Joint Fingerprinting/Encryption for Medical Image Security
Conghuan Ye,Zenggang Xiong,Yaoming Ding,Xueming Zhang,Guangwei Wang,Fang Xu 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.1
Electronic health records (EHRs) facilitates the healthcare process. However, it can also cause serious security and privacy problems. While various conventional encryption mechanisms can solve some aspects of these problems, they cannot address the illegal distribution of decrypted medical images. To protect decrypted medical images from being illegally distributed by an authorized staff member, the scheme proposed in this paper provides a joint fingerprinting and encryption (JFE) scheme based on GoL (Game of Life) and DNA computing with the purpose of protecting medical media distribution. In this study, GoL and DNA are used to confuse in DWT domain and diffusion in spatial domain respectively, and fingerprints are embedded into the HL and LH subbands of DWT domain. The use of fingerprinting along with encryption can provide a double-layer of protection to medical image. Experimental results show the effectiveness of the proposed scheme.