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基于改进ResNet网络的复数SAR图像舰船目标识别方法 被引量:9
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作者 雷禹 冷祥光 +2 位作者 周晓艳 孙忠镇 计科峰 《系统工程与电子技术》 EI CSCD 北大核心 2022年第12期3652-3660,共9页
合成孔径雷达(synthetic aperture radar,SAR)采用微波相干成像,因此SAR图像本质上是复数的。传统基于神经网络的SAR图像目标识别方法,通常只处理SAR图像的幅度信息,无法有效利用SAR图像特有的复数信息。本文面向SAR图像中的舰船目标识... 合成孔径雷达(synthetic aperture radar,SAR)采用微波相干成像,因此SAR图像本质上是复数的。传统基于神经网络的SAR图像目标识别方法,通常只处理SAR图像的幅度信息,无法有效利用SAR图像特有的复数信息。本文面向SAR图像中的舰船目标识别应用,从SAR图像的本质出发,首先通过组合SAR图像的实部、虚部和幅度三通道信息,隐式地提供了输入数据的复数信息表示;然后在ResNet18网络及其结构基础上引入通道注意力机制,使网络能自适应学习实部、虚部和幅度三通道之间包含的复数信息;最后引入标签平滑正则化,解决因复数数据集样本较少出现的过拟合现象。基于OpenSARShip数据集的实验结果表明,所提方法可以较好利用SAR图像本身的复数信息,在一定程度上提升了基于深度神经网络的舰船目标识别效果。 展开更多
关键词 合成孔径雷达 神经网络 复数信息 舰船目标识别
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基于CAMP稀疏重建算法的并行实现 被引量:5
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作者 郭宾 张冰尘 《国外电子测量技术》 2016年第5期24-28,共5页
高分辨率合成孔径雷达(SAR)数据量大,导致稀疏重建过程计算量大。复数近似信息传递(CAMP)是一种收敛速度快的稀疏重建算法,经常被用于稀疏信号重建。为了解决计算量大的问题,提出了一种基于CAMP的并行算法,在计算统一设备架构(CUDA)上对... 高分辨率合成孔径雷达(SAR)数据量大,导致稀疏重建过程计算量大。复数近似信息传递(CAMP)是一种收敛速度快的稀疏重建算法,经常被用于稀疏信号重建。为了解决计算量大的问题,提出了一种基于CAMP的并行算法,在计算统一设备架构(CUDA)上对CAMP算法中Chirp Scaling算子和排序算法进行优化。在Chirp Scaling算子中,主要对矩阵转置、FFT和IFFT进行并行优化,并引入并行版本的双调排序。最后,利用串行的CAMP算法和并行的CAMP算法分别重构点目标图像。实验结果表明,在正确重建的前提下,并行的CAMP算法的比串行CAMP算法快29.55倍。 展开更多
关键词 合成孔径雷达(SAR) 复数近似信息传递(CAMP) 稀疏重建算法 计算统一设备架构(CUDA)
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Towards a self healing information system for digital libraries
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作者 AMBATI Vamshi REDDY Raj 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第11期1221-1228,共8页
An important area of focus in complex systems development is the capability to adapt to variable runtime environmental resources and to accommodate runtime system failures. The research in this area is broadly termed ... An important area of focus in complex systems development is the capability to adapt to variable runtime environmental resources and to accommodate runtime system failures. The research in this area is broadly termed as “Self Healing” and has recently aroused increasing attention to complex systems. Digital libraries have gained popularity because of the richer features they provide compared to traditional libraries. As more users begin to use digital libraries, addressing downtimes of these valuable resources has become a high priority. Operating and providing access to digital content to anyone, anytime from anywhere in the world, results in a continued rise of administrative overhead for system monitoring and needs continuous human intervention. Given the volume of information and the huge infrastructure of modem libraries, continuous manual system administration is quite costly and not feasible. In this paper we propose a self healing digital library system as the solution to this problem and present the approach of adding self healing capabilities to an existing digital library project, the Digital Library of India (DLI). We also propose a self healing framework that enables successful reuse of our approach to other architecturally similar digital library systems. 展开更多
关键词 Digital library Self healing systems Failover Configuration management
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Quantitative Evaluation of Neuroplastic Biomaterial for Human Brain Rehabilitation to Stroke Subjects
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作者 Chiyuri Nagayama 《Journal of Chemistry and Chemical Engineering》 2013年第11期1036-1043,共8页
Neurorehabilitation involves training of brain activity, which influences the resistive torque and electromyogram. This quantitative evaluation is numerical modeling of biomaterial of human body. Measurement for rehab... Neurorehabilitation involves training of brain activity, which influences the resistive torque and electromyogram. This quantitative evaluation is numerical modeling of biomaterial of human body. Measurement for rehabilitation and developing numerical modeling in patients are useful for information technology education with healthcare background. The resistive torque and electromyogram were measured. Electromyogram is the neuronal activity from eight lower limb muscles. Both activities are output signals for angle input signals. The resistive torque of a stroke patient shows a hysteresis curve, and this is a velocity-dependent component, particular for stroke. Differentiated angle by muscle spindle, a velocity-dependent component, is a stretch reflex (spasticity). In an electromyogram of a stroke patient, SLR (stretch reflex via spinal cord) means a short latency reflex, and LLR (stretch reflex via cerebral cortex) means a long latency reflex. An example of some stroke electromyogram shows long latency reflex, and this is voluntary movement during the experiment. The example of some stroke resistive torque reveals that viscoelasticity is used for the intrinsic component. The example of some stroke electromyogram reveals that long latency reflex is used for the reflex component of lower limbs. Current research needs improvement. Intrinsic viscoelasticity is modeled by a second-order differential equation. The reflex component of stroke patients is modeled by a double exponential function. Open source software is in use. Information technology-based analyses by numerical modeling would be applied in future healthcare education. 展开更多
关键词 Analysis programming biological tissue educational effect developmental process.
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Analysis and evaluation of structural complexity of circular economy system's industrial chain
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作者 Hua-Ling SONG Yi ZHANG +1 位作者 Chun-Lei LI Chuan-Peng WANG 《Journal of Coal Science & Engineering(China)》 2013年第3期427-432,共6页
This paper examined the method to evaluate structural complexity of circular economy system's industrial chain, which applied entropy information and hierarchical metrics to produce complexity degrees according to th... This paper examined the method to evaluate structural complexity of circular economy system's industrial chain, which applied entropy information and hierarchical metrics to produce complexity degrees according to the theory of complex system. We developed an evaluation model to make a general metrics for circular economy system of industrial chains. The development of the evaluation tree drew upon five factors to identify the structural complexity. The evaluation model generated unitive entropy information from six data definition (node, level of community, metabolic span, degree of node, number of relation and connectivity of node) according to the evaluation tree. The industrial chains of Tashan circular economy park of Datong Coal Mine Group and Gujiao circular economy park of Xishan Coal-Electricity Group were evaluated by the proposed method. The key factors stunted by the decline of structural complexity were identified and the unitive metrics of entropy information of the industrial chain was shown for realigning the circular economy systems. 展开更多
关键词 COMPLEXITY circular economy system industrial chain evaluation of complexity
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