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- 저자 : Jingshu Sang (검색결과 2 건)
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Jingshu Sang,Dazhong Ma,Xuguang Hu,Xiangpeng Xie 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.4
The mixed planting, as one of the diversification strategies, provides the substitute for many costly inputs, such as fertilizers, pesticides, imported pollinators and irrigation. However, the lack of the farming technology and the expansion of the farming scale have resulted in extremely mismatch between desired yield and manpower. This paper considers groups of agents orderly moving into precise regions, which is suitable for simultaneously planting of different crops. The hierarchical containment control strategy with group-aggregation behavior is proposed under the transformed three-layer topology. Particularly, the dynamic hierarchical containment control protocol is designed such that a novel group-aggregation cooperation in the convex hull can be achieved. A new coupling strength coefficient based on the transformed three-layer topology is defined in the proposed control protocol. Finally, two examples are provided to demonstrate the effectiveness of the proposed dynamic hierarchical containment control protocol for agricultural settings.
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Thin layer terahertz sensing using two-channel parallel-plate waveguides.
Bark, Hyeon Sang,Zha, Jingshu,Lee, Eui Su,Jeon, Tae-In Optical Society of America 2014 Optics express Vol.22 No.14
<P>We report on the highly sensitive terahertz measurement of a thin, dielectric layer using two channels formed by inserting a single slit sheet in the parallel-plate waveguides (PPWGs). When a thin layer is applied to coat the upper surface of the channel, the single resonance frequency caused by the two-channel PPWGs is shifted as a result of the layer's properties, including length, thickness, and refractive index. The measured frequency tuning sensitivities (FTS) throughout the 20-mm layer length are 2.41 and -1.95 GHz/mm at the open upper and lower channels, respectively. The experimental results agree with those of theoretical simulations performed using the finite-difference time-domain (FDTD) method.</P>
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