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RISS 인기검색어
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- 저자 : Fu Jinzhao (검색결과 2 건)
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Xu Fangmin,Fu Jinzhao,Cao HaiYan,Hu ZhiRui 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.7
In order to improve spectral efficiency and reduce power consumption for reconfigurable intelligent surface (RIS) assisted wireless communication systems, a joint design considering irregular RIS topology, RIS on-off switch, power allocation and phase adjustment is investigated in this paper. Firstly, a multi-dimensional variable joint optimization problem is established under multiple constraints, such as the minimum data requirement and power constraints, with the goal of maximizing the system energy efficiency. However, the proposed optimization problem is hard to be resolved due to its property of nonlinear nonconvex integer programming. Then, to tackle this issue, the problem is decomposed into four sub-problems: topology design, phase shift adjustment, power allocation and switch selection. In terms of topology design, Tabu search algorithm is introduced to select the components that play the main role. For RIS switch selection, greedy algorithm is used to turn off the RISs that play the secondary role. Finally, an iterative optimization algorithm with high data-rate and low power consumption is proposed. The simulation results show that the performance of the irregular RIS aided system with topology design and RIS selection is better than that of the fixed topology and the fix number of RISs. In addition, the proposed joint optimization algorithm can effectively improve the data rate and energy efficiency by changing the propagation environment.
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Developing a Dwarf Echinacea purpurea Line by Suppressing DWF3 Expression via RNA Interference
Jin Zhao,Yuan-Yuan Fu,Jong-Hwa Park,Geun-Won Choi,Kong Young Park,Youn Hyung Lee,In Sik Chung 한국원예학회 2017 원예과학기술지 Vol.35 No.5
DWARF3 (DWF3) is a brassinosteroid (BR) biosynthesis-related enzyme that catalyzes the C-3 oxidation of early BR intermediates. For the first time, we isolated the EpDWF3 gene from Echinacea purpurea . EpDWF3 shares high homology with At CYP90A1 and Ze CPD1, a steroid 23-alpha-hydroxylase involved in the BR-biosynthetic pathway. We generated transgenic Echinacea plants via transformation with an RNA interference (RNAi) construct that expresses hairpin double-stranded RNA for EpDWF3 to induce sequence-specific RNA silencing. The transgenic plants displayed dwarf phenotypes, including reduced plant height and small flower diameter. We confirmed the presence of the RNAi construct in the transgenic plants by genomic DNA PCR. The transcript level of EpDWF3 decreased by 48% in the transgenic plants compared to wild type. Our results indicate that the knock-down of BR biosynthesis-related genes by RNAi enables the production of valuable dwarf plants for commercial horticultural or agricultural applications.
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