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Zuo, Yi,Wang, Yaonan,Huang, Lihong,Li, Chunsheng Korean Mathematical Society 2009 대한수학회지 Vol.46 No.5
This paper considers the problem of existence and exponential stability of almost periodic solution for shunting inhibitory cellular neural networks with distributed delays and large impulses. Based on the contraction principle and Gronwall-Bellman's inequality, some sufficient conditions are obtained. The results of this paper are new and they complement previously known results.
Yi Zuo,Yaonan Wang,Lihong Huang,Chunsheng Li 대한수학회 2009 대한수학회지 Vol.46 No.5
This paper considers the problem of existence and exponential stability of almost periodic solution for shunting inhibitory cellular neural networks with distributed delays and large impulses. Based on the contraction principle and Gronwall-Bellman's inequality, some sufficient conditions are obtained. The results of this paper are new and they complement previously known results. This paper considers the problem of existence and exponential stability of almost periodic solution for shunting inhibitory cellular neural networks with distributed delays and large impulses. Based on the contraction principle and Gronwall-Bellman's inequality, some sufficient conditions are obtained. The results of this paper are new and they complement previously known results.
An Efficient Markov Chain Based Channel Model for 6G Enabled Massive Internet of Things
( Wei Yang ),( Xiaojun Jing ),( Hai Huang ),( Chunsheng Zhu ),( Qiaojie Jiang ),( Dongliang Xie ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.11
Accelerated by the Internet of Things (IoT), the need for further technical innovations and developments within wireless communications beyond the fifth generation (B5G) networks is up-and-coming in the past few years. High altitude platform station (HAPS) communication is expected to achieve such high levels that, with high data transfer rates and low latency, millions of devices and applications can work seamlessly. The HAPS has emerged as an indispensable component of next-generations of wireless networks, which will therefore play an important role in promoting massive IoT interconnectivity with 6G. The performance of communication and key technology mainly depend on the characteristic of channel, thus we propose an efficient Markov chain based channel model, then analyze the HAPS communication system's uplink capability and swing effect through experiments. According to the simulation results, the efficacy of the proposed scheme is proven to meet the requirements of ubiquitous connectivity in future IoT enabled by 6G.
Investigation on Spraying Uniformity in Etching Process of FPCB with 18 μm Line Pitch
Ruijian Ming,Hui Li,Aojie Chen,Jiazheng Sheng,Bin Sun,Jian Wang,Chunsheng Huang,Jie Yang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.5
In the wet etching process of the flexible printed circuit board (FPCB), to obtain a symmetrical and stable circuit structure and improve the yield, it is necessary to control the uniformity of the etchant velocity and pressure on the surface of the FPCB as far as possible. In this paper, a numerical method implemented with Euler multiphase flow model is proposed to study the spraying uniformity of the wet etching process of the FPCB. A 3D full model of the multi-nozzle array is established to study the velocity distribution of the etchant in the spraying domain. The FPCB sample is manufactured based on the process parameters obtained by the parametric study. In the experiment, pressure sensors are applied to monitor the etchant pressure on the surface of the FPCB and the cross-section of the FPCB circuit is observed, which validates the numerical simulation method. The results of simulations demonstrate that when the nozzle rotation angle θ is 1.3°, the distribution of the low-speed flow zone on the surface of the FPCB is about 60 mm along the X axis direction, and the standard deviation of the pressure is reduced by 67.6% compared to 0°. The cross-section of the FPCB circuit is close to an isosceles trapezoid with an 18 μm line pitch, which is the center-to-center distance between the adjacent circuit lines.