Software.defined networking(SDN) enables third.part companies to participate in the network function innovations. A number of instances for one network function will inevitably co.exist in the network. Although some o...Software.defined networking(SDN) enables third.part companies to participate in the network function innovations. A number of instances for one network function will inevitably co.exist in the network. Although some orchestration architecture has been proposed to chain network functions, rare works are focused on how to optimize this process. In this paper, we propose an optimized model for network function orchestration, function combination model(FCM). Our main contributions are as following. First, network functions are featured with a new abstraction, and are open to external providers. And FCM identifies network functions using unique type, and organizes their instances distributed over the network with the appropriate way. Second, with the specialized demands, we can combine function instances under the global network views, and formulate it into the problem of Boolean linear program(BLP). A simulated annealing algorithm is designed to approach optimal solution for this BLP. Finally, the numerical experiment demonstrates that our model can create outstanding composite schemas efficiently.展开更多
针对当前去雾算法效率不高、细节恢复较差等问题,提出一种改进多尺度AOD-Net(all in one dehazing network)的去雾算法。通过增加注意力机制、调整网络结构和改变损失函数这3方面的改进,增强网络的特征提取和恢复能力。模型的第1层增加...针对当前去雾算法效率不高、细节恢复较差等问题,提出一种改进多尺度AOD-Net(all in one dehazing network)的去雾算法。通过增加注意力机制、调整网络结构和改变损失函数这3方面的改进,增强网络的特征提取和恢复能力。模型的第1层增加空间金字塔注意力(spatial pyramid attention,SPA)机制,使网络在特征提取过程中避免冗余信息。将网络改成拉普拉斯金字塔型结构,使模型能够提取不同尺度的特征,保留特征图的高频信息。使用多尺度结构相似性(multi-scale structural similarity,MS-SSIM)+L1损失函数替换原有的损失函数,提高模型保留结构的能力。实验结果表明,本方法去雾效果更好,细节更丰富。在定性可视化评价方面,去雾图像效果优于原网络。在定量评估层面,与原网络相比PSNR值提升了2.55 dB,SSIM值提升了0.04,IE熵值增加了0.18,这些数值指标充分验证了本算法的出色去雾效果和稳定性。展开更多
基金supported by the China Postdoctoral Fund Project (No.44603)the National Natural Science Foundation of China (No.61309020)+1 种基金the National key Research and Development Program of China (No.2016YFB0800100, 2016YFB0800101)the National Natural Science Fund for Creative Research Groups Project(No.61521003)
文摘Software.defined networking(SDN) enables third.part companies to participate in the network function innovations. A number of instances for one network function will inevitably co.exist in the network. Although some orchestration architecture has been proposed to chain network functions, rare works are focused on how to optimize this process. In this paper, we propose an optimized model for network function orchestration, function combination model(FCM). Our main contributions are as following. First, network functions are featured with a new abstraction, and are open to external providers. And FCM identifies network functions using unique type, and organizes their instances distributed over the network with the appropriate way. Second, with the specialized demands, we can combine function instances under the global network views, and formulate it into the problem of Boolean linear program(BLP). A simulated annealing algorithm is designed to approach optimal solution for this BLP. Finally, the numerical experiment demonstrates that our model can create outstanding composite schemas efficiently.
文摘针对当前去雾算法效率不高、细节恢复较差等问题,提出一种改进多尺度AOD-Net(all in one dehazing network)的去雾算法。通过增加注意力机制、调整网络结构和改变损失函数这3方面的改进,增强网络的特征提取和恢复能力。模型的第1层增加空间金字塔注意力(spatial pyramid attention,SPA)机制,使网络在特征提取过程中避免冗余信息。将网络改成拉普拉斯金字塔型结构,使模型能够提取不同尺度的特征,保留特征图的高频信息。使用多尺度结构相似性(multi-scale structural similarity,MS-SSIM)+L1损失函数替换原有的损失函数,提高模型保留结构的能力。实验结果表明,本方法去雾效果更好,细节更丰富。在定性可视化评价方面,去雾图像效果优于原网络。在定量评估层面,与原网络相比PSNR值提升了2.55 dB,SSIM值提升了0.04,IE熵值增加了0.18,这些数值指标充分验证了本算法的出色去雾效果和稳定性。
