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SuperFlow:A Reliable and Scalable Architecture for Large-Scale Enterprise Networks

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Chinese Journal of Electronics 2016年第6期25卷 1134-1140页

作者： hu guangwu JIANG Yong CHEN Wenlong CHEN Tan WU Jianping School of Computer Science Shenzhen Institute of Information Technology Graduate School at Shenzhen Tsinghua University Information Engineering College Capital Normal University College of Computer Science Beijing University of Technology Department of Computer Science and Technology Tsinghua University

With the increasing number of users, enterprise networks have become more and more important, but it also faced new challenges in various *** OpenF low, the promising de facto Software defined networking(SDN) scheme which can provide finegrained and flow-level control for enterprise networks, yet it still has a few undesirable designs in credibility and scalability. Inspired by OpenF low-included many excellent studies, we have proposed a reliable and scalable architecture—Super Flow for large-scale enterprise networks in this paper. It inherits the merits of OpenF low, and overcomes OpenF lows limitations by introducing some novel *** prototype experiment has proved that Super Flow possesses these features with desirable performance.

关键词： Enterprise network SuperFlow OpenFlow Source address validation improvement(SAVI) Software defined networking(SDN)

A Machine Learning Based Funding Project Evaluation Decision Prediction

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Computer Systems Science & Engineering 2023年第5期45卷 2111-2124页

作者： Chuqing Zhang Jiangyuan Yao guangwu hu Xingcan Cao Economic Research Institute Beijing Language and Culture UniversityBeijing100083China School of Computer Science and Technology Hainan UniversityHaikou570228China School of Computer Science Shenzhen Institute of Information TechnologyShenzhen518172China Faculty of Arts University of British ColumbiaVancouverCV6T 1Z1Canada

Traditional linear statistical methods cannot provide effective prediction results due to the complexity of human *** this paper,we apply machine learning to the field of funding allocation decision making,and try to explore whether personal characteristics of evaluators help predict the outcome of the evaluation decision?and how to improve the accuracy rate of machine learning methods on the imbalanced dataset of grant funding?Since funding data is characterized by imbalanced data distribution,we propose a slacked weighted entropy decision tree(SWE-DT).We assign weight to each class with the help of slacked *** experimental results show that the SWE decision tree performs well with sensitivity of 0.87,specificity of 0.85 and average accuracy of *** also provides a satisfied classification accuracy with Area Under Curve(AUC)=*** implies that the proposed method accurately classified minority class instances and suitable to imbalanced *** adding evaluator factors into the model,sensitivity is improved by over 9%,specificity improved by nearly 8%and the average accuracy also increased by 7%.It proves the feasibility of using evaluators’characteristics as *** by innovatively using machine learning method to predict evaluation decisions based on the personal characteristics of evaluators,it enriches the literature in the field of decision making and machine learning field.

关键词： Expert evaluation prediction machine learning grant allocation

Three-Layer Structured SnO_(2)@C@TiO_(2)Hollow Spheres for High-Performance Sodium Storage

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Energy & Environmental Materials 2021年第3期4卷 428-433页

作者： Yu Tian Ping hu Ting Zhu Zhenhui Liu guangwu hu Congcong Cai Zelang Jian Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

The unsatisfactory conductivity and large volume variation severely handicap the application of SnO_(2)in sodium-ion batteries(SIBs).Herein,we design unique three-layer structured SnO_(2)@C@TiO_(2)hollow spheres to tackle the above-mentioned *** hollow cavity affords empty space to accommodate the volume variation of SnO_(2),while the C and TiO_(2)protecting shells strengthen the structural integrity and enhances the electrical *** a result,the three-layer structured SnO_(2)@C@TiO_(2)hollow spheres demonstrate enhanced Na storage *** SnO_(2)@C@TiO_(2)manifests a reversible capacity two times to that of pristine SnO_(2)hollow *** addition,Ex situ XRD reveals highly reversible alloying and conversion reactions in SnO_(2)@C@TiO_(2)hollow *** study suggests the introduction of a hollow cavity and robust protecting shells is a promising strategy for constructing SIB anode materials.

关键词： hollow sphere SnO_(2) sodium-ion battery protecting shell structural integrity

Towards evolvable Internet architecture-design constraints and models analysis

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Science China(Information Sciences) 2014年第11期57卷 6-29页

作者： XU Ke Zhu Min hu guangwu Zhu Liang ZHONG YiFeng LIU Ying WU JianPing WANG Ning Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computer Science and Technology Tsinghua University Network Research Center Tsinghua University Centre for Communication Systems Research University of Surrey

There is a general consensus about the success of Internet architecture in academia and ***, with the development of diversified application, the existing Internet architecture is facing more and more challenges in scalability, security, mobility and performance. A novel evolvable Internet architecture framework is proposed in this paper to meet the continuous changing application requirements. The basic idea of evolvability is relaxing the constraints that limit the development of the architecture while adhering to the core design principles of the Internet. Three important design constraints used to ensure the construction of the evolvable architecture, including the evolvability constraint, the economic adaptability constraint and the manageability constraint, are comprehensively described. We consider that the evolvable architecture can be developed from the network layer under these design constraints. What’s more, we believe that the address system is the foundation of the Internet. Therefore, we propose a general address platform which provides a more open and efficient network environment for the research and development of the evolvable architecture.

关键词： evolvable architecture design constraints evolvability evaluation model economic adaptability general address platform

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南京地震台甚宽频地震计观测性能研究

华南地震 2024年第3期44卷 51-58页

作者：张敏宫杰立凯张扬居海华胡光武江苏省地震局宿迁地震监测中心站南京地震监测中心站

为深入研究甚宽频地震计观测性能，利用南京地震台GL-S120型和ITC-120A型两套甚宽频地震计开展对比观测。从台站记录波形、相关性以及台基噪声等方面开展差异性分析，结果表明：ITC-120A型地震计不易受外界干扰，尤其垂直向比较明显；... 详细信息

为深入研究甚宽频地震计观测性能，利用南京地震台GL-S120型和ITC-120A型两套甚宽频地震计开展对比观测。从台站记录波形、相关性以及台基噪声等方面开展差异性分析，结果表明：ITC-120A型地震计不易受外界干扰，尤其垂直向比较明显；两套地震计相关性夜晚安静时段优于白天；通过计算PSD（功率谱密度）分析台基噪声，结果表明GL-S120型地震计低频段噪声水平随着外界干扰增强而显著上升，导致GL-S120型地震计记录中小级远震效果较差，震相不易识别。自噪声计算分析表明两套地震计功率谱曲线差异与二者自噪声水平有关，检测方法和台基噪声等因素影响设备自噪声测试的相关性，从而影响地震计自噪声计算精度。

关键词：甚宽频地震计自噪声台基噪声相关性

Recent advances in TiO_2 nanoarrays/graphene for water treatment and energy conversion/storage

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Science China Materials 2019年第3期62卷 325-340页

作者： Yanhua Fan guangwu hu Shuaiqin Yu Liqiang Mai Lin Xu College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 200135China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Although TiO2-based nanostructures with unique chemical and physical properties exhibit great promise in water treatment and energy conversion/storage,there still exist some *** order to further improve the photochemical properties,one-dimension TiO2 nanoarrays on the substrate are primarily combined with graphene by various preparation *** composite coating has exhibited extraordinary photocatalytic abilities in the degradation of organic pollutants into less toxic compounds,antimicrobial activity and adsorption capacity in water ***,it is easy to recycle after photocatalytic ***,TiO2 nanoarrays/graphene on the substrate(especially flexible substrate)could provide potential opportunities for flexible-device fabrication with excellent photovoltaic conversion efficiency and electrochemical performance in energy conversion/storage *** far as we know,the relevant reviews have rarely been ***,we present a comprehensive review on the preparation of TiO2 nanoarrays or TiO2 nanoarrays/graphene,and their application and mechanism in water treatment and energy conversion/storage.

关键词： TiO2 nanoarrays graphene photocatalysis water treatment energy conversion/storage

石墨烯基复合电极在非对称超级电容器中的研究进展

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化工进展 2017年第8期36卷 2978-2985页

作者：胡光武李曦张超灿武汉理工大学材料科学与工程学院湖北武汉430070

非对称超级电容器(ASCs)因电化学性能更为优异而成为近几年来的研究热点,石墨烯作为一种新颖的二维碳材料,具有比表面积大、导电性高、力学性能好和化学稳定性优异等优点,是非对称超级电容器复合电极的一类理想载体材料。本文综述了近... 详细信息

非对称超级电容器(ASCs)因电化学性能更为优异而成为近几年来的研究热点,石墨烯作为一种新颖的二维碳材料,具有比表面积大、导电性高、力学性能好和化学稳定性优异等优点,是非对称超级电容器复合电极的一类理想载体材料。本文综述了近几年来石墨烯基复合电极在非对称超级电容器中的应用状况,认为比表面积更大、导电性更好的石墨烯将会促进石墨烯基复合电极在超级电容器中的应用与发展,也会提高石墨烯基非对称超级电容器的性能。指出将金属氧化物、导电聚合物、金属氢氧化物以及金属硫化物纳米化,使之兼具大的有效面积、丰富的氧化还原活性位点等特点,从而提高复合材料的比电容,是石墨烯基复合电极的研究重点。

关键词：石墨烯纳米结构复合材料非对称超级电容器能量密度功率密度

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元学习策略及性能评价

西安交通大学学报 2005年第6期39卷 570-573页

作者：杨利英覃征胡广伍张选平西安交通大学电子与信息工程学院西安710049

为提高分类系统的性能,提出一种统一多种元学习算法的元学习框架,定义并描述了并行和串行两种组合方式.由基分类器的分类结果构成新属性,并加入到特征向量中以形成元数据.通过扩展特征向量,元学习增强了对假设空间的表达能力,降低了系... 详细信息

为提高分类系统的性能,提出一种统一多种元学习算法的元学习框架,定义并描述了并行和串行两种组合方式.由基分类器的分类结果构成新属性,并加入到特征向量中以形成元数据.通过扩展特征向量,元学习增强了对假设空间的表达能力,降低了系统的偏差.在加州大学提供的标准数据集上对元学习策略进行了实验研究,结果表明:与多数投票、最大规则、最小规则等融合方法实现的多分类器系统相比,并行和串行组合在所用数据集上的平均分类错误率可分别降低39.12%和40.56%,且在n分交叉验证中n值的增加并不能改进分类性能,串行组合中的基分类器的顺序对分类错误率没有显著影响.

关键词：模式分类多分类器系统元学习

铸造CrCoNi中熵合金碳化物析出行为及力学性能

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特种铸造及有色合金 2021年第6期41卷 738-742页

作者：缪良田杜辉胡光武武汉科技大学冶金装备及其控制教育部重点实验室武汉430081 武汉科技大学机械传动与制造工程湖北省重点实验室华中科技大学材料成形与模具技术国家重点实验室

针对铸造CrCoNi中熵合金室温强度低的问题,添加了3%(摩尔分数,下同)的Mo和0.5%的C,研究了碳化物的析出行为及其对合金的相结构、微观组织、硬度和室温压缩性能的影响。制备工艺采用传统的电弧熔炼、滴铸、固溶(1250℃×6 h)和时效(950℃... 详细信息

针对铸造CrCoNi中熵合金室温强度低的问题,添加了3%(摩尔分数,下同)的Mo和0.5%的C,研究了碳化物的析出行为及其对合金的相结构、微观组织、硬度和室温压缩性能的影响。制备工艺采用传统的电弧熔炼、滴铸、固溶(1250℃×6 h)和时效(950℃×1 h)处理,制备的铸造合金中析出了弥散分布的M_(23)C_(6)碳化物。细小的碳化物均匀分布在晶粒内部,粗大的碳化物分布在晶界。经碳化物强化后,CrCoNi合金的硬度(HV)由157增加到250,屈服强度由223 MPa提高到342 MPa,强化效果主要归因于碳化物的析出强化。

关键词：中熵合金碳化物微观组织硬度压缩性能