基于注意力和分组卷积的眼底图像多病变自动诊断

青光眼性视盘改变、视网膜出血和渗出是诊断眼底疾病的主要特征,传统方法可诊断是否患有眼底疾病,但难以对眼底疾病诊断结果给出合理的解释。鉴于此,提出了一种融合双重注意力机制的卷积神经网络(CNN),实现了眼底多病变特征的自动诊断。CNN采用残差结构,在残差块中利用分组卷积以减少网络参数量,并在每组卷积之后嵌入通道和空间注意力机制以提升眼底病变诊断的准确率。该模型在宁波市眼科医院临床数据上进行了实验,青光眼性视盘改变、视网膜渗出和出血3种病变的诊断准确率分别为98.17%、97.49%、97.15%,结果表明:该模型在眼底多病变诊断中表现出很好的特征提取能力和诊断性能。

Automatic diagnosis of multiple fundus lesions based on depth graph neural network

Fundus images are commonly used to capture changes in fundus structures and the severity of fundus lesions,and are the basis for detecting and treating ophthalmic diseases as well as other important diseases.This study proposes an automatic diagnosis method for multiple fundus lesions based on a deep graph neural network(GNN).2083 fundus images were collected and annotated to develop and evaluate the performance of the algorithm.First,high-level semantic features of fundus images are extracted using deep convolutional neural networks(CNNs).Then the features are input into the GNN to model the correlation between different lesions by mining and learning the correlation between lesions.Finally,the input and output features of the GNN are fused,and a multi-label classifier is used to complete the automatic diagnosis of fundus lesions.Experimental results show that the method proposed in this study can learn the correlations between lesions to improve the diagnostic performance of the algorithm,achieving better performance than the original Res Net and Dense Net models in both qualitative and quantitative evaluation.

基于改进粒子群算法的后向泵浦RFA设计

为了满足第六代移动通信(6G)系统对光通信网络的高速率及大容量的要求,进一步提高光传输网络中光纤放大器的带宽、响应速率及放大倍数等成为目前的研究重点。在使用碲酸盐光纤作为光纤增益介质的同时,提出一种改进粒子群优化算法,通过在迭代过程中动态的调整速度、位置及惯性权重值,获得更高收敛速度,增强全局搜索的能力。应用该算法对拉曼光纤放大器的各个泵浦光参数配置进行优化、分析及仿真验证,最终设计出平均开关增益为23.738 8 dB,增益平坦度为0.209 8 dB的后向泵浦拉曼光纤放大器。结果表明,改进的粒子群优化算法对拉曼放大器泵浦光的参数配置有很强的适应性,能够获得较低的增益平坦度,对未来拉曼光纤放大器的设计具有一定的参考意义。

民族地区乡村治理的习惯规则之维——基于新制度主义的分析

习惯规则作为一种非正式制度,对民族地区乡村社会的治理具有一定的积极成效。习惯规则具有规范、规制及文化认知三大功能,在其运行主体的互动中,型塑出民族地区内源式乡村治理机制。随着国家权力的下沉,习惯规则与国家正式制度之间发生了碰撞与冲突,习惯规则的运行空间遭受了“挤压”,习惯规则也遭遇了“合法性”挑战。要想更好地治理民族地区乡村社会,必须要促进国家正式制度和习惯规则之间的融合,最终形成嵌入式乡村共治机制。