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为使OFDM（正交频分复用）技术在宽带无线通信中得到实际运用,提出了基于IEEE 802.11a协议的OFDM发射机的设计方案及关键技术的实现方法。在设计中采用自顶向下的设计思想,通过数字锁相环、乒乓RAM（随机存储器）等方式提高系统运行的可靠性。并利用Altera公司的Cyclone IV E系列FPGA（现场可编程门阵列）器件的特点和灵活的IP Core（知识产权核）功能,实现了OFDM发射机的设计。在Modelsim环境下的仿真结果证明了该设计的有效性,且占用的资源少。

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The currently widely used lightweight neural networks still have the problems such as large number of calculations and parameters, which make cheap mobile devices with low computation resources cannot quickly complete the image classification tasks. Aiming at this problem, this paper proposed a lightweight neural network that was more suitable for using on cheap mobile devices with low computation resources. This paper introduced cheap linear operations and concatenations of feature maps to reduce the number of calculations and parameters of the neural network. Also, this paper introduced improved residual structure, attention mechanism and label smoothing to improve the accuracy of result. Experiments based on PD-38 dataset show that the proposed neural network can achieve higher classification accuracy by using a smaller number of calculations and parameters than traditional lightweight neural networks. Experiments on the public dataset CIFAR-10 further show that the neural network is universal. [ABSTRACT FROM AUTHOR]

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Objective·To investigate the effects of glucose reperfusion after low-glucose on the activity of autophagy in rat cardiomyocyte H9c2. Methods·H9c2 cells were assigned to low glucose group (LG), glucose reperfusion group (RG), autophagy inhibition group (RG+CQ), and control group (Con). LG group was treated with low glucose medium for 2 h. RG group was treated with high glucose medium for 2 h after being treated with low glucose medium for 2 h. For RG+CQ group, CQ was added 1 h before low glucose and high glucose treatment. Con group was treated with high glucose medium. MTT assay was used to detect the proliferation of H9c2 cells, lactate dehydrogenase assay was used to detect the cytotoxicity, and Western blotting was used to measure the expressions of p-mTOR, mTOR, p-AMPK, AMPK LC3, and beclin-1. Results·RG group had reduced cell proliferation capacity and increased LDH activity as compared with LG group (P<0.05). RG+CQ group had lower cell proliferation capacity and higher LDH activity as compared with RG group (P<0.05). Results of Western blotting showed that RG group had higher expressions of p-AMPK, LC3II/I, and beclin-1 and lower expression of p-mTOR as compared with LG group (P<0.05), and RG+CQ group had higher expression of LC3II/I and beclin-1 as compared with RG group (P<0.05). Conclusion·Glucose reperfusion after low-glucose increases autophagy activity in H9c2 cells. This may be related to the activation of AMPK/mTOR pathway and increased autophagy activity can protect cardiomyocytes. [ABSTRACT FROM AUTHOR]