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一种基于SDN的数据中心负载均衡路由算法 被引量:2
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作者 徐新羽 戴新发 +1 位作者 夏静 李文铖 《舰船电子工程》 2021年第7期129-132,共4页
随着数据中心网络对带宽和容错性等方面要求的不断提高,越来越多的数据中心开始采用胖树拓扑结构,胖树拓扑结构可以为任意两个不同POD的服务器提供多条等价路径,从而带来了高带宽和高容错性。然而,传统的路由算法并不能很好发挥胖树结... 随着数据中心网络对带宽和容错性等方面要求的不断提高,越来越多的数据中心开始采用胖树拓扑结构,胖树拓扑结构可以为任意两个不同POD的服务器提供多条等价路径,从而带来了高带宽和高容错性。然而,传统的路由算法并不能很好发挥胖树结构带来的性能提升,会造成很大的带宽浪费。因此,研究了一种基于SDN的数据中心负载均衡路由算法,依赖SDN控制器获取的数据中心网络全局信息,作出最优的负载均衡路由决策,从而降低网络拥塞的概率,并提高带宽利用率。 展开更多
关键词 SDN 负载均衡 路由选择
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High-contrast imaging based on wavefront shaping to improve low signal-to-noise ratio photoacoustic signals using superpixel method
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作者 吕新晶 徐新羽 +3 位作者 冯祺 张彬 丁迎春 柳强 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第3期251-258,共8页
Photoacoustic(PA) imaging has drawn tremendous research interest for various applications in biomedicine and experienced exponential growth over the past decade. Since the scattering effect of biological tissue on ult... Photoacoustic(PA) imaging has drawn tremendous research interest for various applications in biomedicine and experienced exponential growth over the past decade. Since the scattering effect of biological tissue on ultrasound is two-to three-orders magnitude weaker than that of light, photoacoustic imaging can effectively improve the imaging depth.However, as the depth of imaging further increases, the incident light is seriously affected by scattering that the generated photoacoustic signal is very weak and the signal-to-noise ratio(SNR) is quite low. Low SNR signals can reduce imaging quality and even cause imaging failure. In this paper, we proposed a new wavefront shaping and imaging method of low SNR photoacoustic signal using digital micromirror device(DMD) based superpixel method. We combined the superpixel method with DMD to modulate the phase and amplitude of the incident light, and the genetic algorithm(GA) was used as the wavefront shaping algorithm. The enhancement of the photoacoustic signal reached 10.46. Then we performed scanning imaging by moving the absorber with the translation stage. A clear image with contrast of 8.57 was obtained while imaging with original photoacoustic signals could not be achieved. The proposed method opens new perspectives for imaging with weak photoacoustic signals. 展开更多
关键词 PHOTOACOUSTIC IMAGING WAVEFRONT SHAPING superpixel METHOD high contrast IMAGING
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Label-Free Microscopic Imaging Based on the Random Matrix Theory in Wavefront Shaping
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作者 俞力奇 徐新羽 +4 位作者 张振峰 冯祺 张彬 丁迎春 柳强 《Chinese Physics Letters》 SCIE CAS CSCD 2019年第11期27-30,共4页
Wavefront shaping technology has mainly been applied to microscopic fluorescence imaging through turbid media,with the advantages of high resolution and imaging depth beyond the ballistic regime. However, fluorescence... Wavefront shaping technology has mainly been applied to microscopic fluorescence imaging through turbid media,with the advantages of high resolution and imaging depth beyond the ballistic regime. However, fluorescence needs to be introduced extrinsically and the field of view is limited by memory effects. Here we propose a new method for microscopic imaging light transmission through turbid media, which has the advantages of label-free and discretional field of view size, based on transmission-matrix-based wavefront shaping and the random matrix theory. We also verify that a target of absorber behind the strong scattering media can be imaged with high resolution in the experiment. Our method opens a new avenue for the research and application of wavefront shaping. 展开更多
关键词 theory. MATRIX ABSORBER
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