摘要 ：

一种面向公有云Web服务的端到端性能瓶颈分析方法属于计算系统性能评测领域。该方法的核心思想是首先依据web服务吞吐率、平均延迟、尾延迟等性能指标构建能覆盖完整端到端过程的归一化指标‑‑通量；其次，在不同的测试压力(HTTP请求并发数)下，依据通量指标的变化趋势，识别公有云web服务的性能拐点；再次，分析性能拐点前后不同系统资源的利用率变化趋势识别定位瓶颈资源；最终，通过改变瓶颈资源配置提高公有云web服务的性能。

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摘要 ：

This paper presents a series of test investigations and finite element (FE) analyses on the compressive behaviors of cold-formed steel (CFS) compression members with web holes of different widths and the corresponding direct strength design method is proposed. In the test investigations, a total of twenty specimens were tested under axial compression loading with five different hole width-to-web width ratios of 0, 0.2, 0.4, 0.6, and 0.8. It is shown that the local buckling deformations for specimens with web holes occur in the vicinity of web holes and decrease as the hole widens. For the axial capacities of specimens, they are decreased by 11.7% on average with the increase of hole width-to-web width ratio from 0 to 0.4 while they are decreased by 31.5% on average with the increase of hole width-to-web width ratio from 0.4 to 0.8. In the FE studies, the FE models for CFS compression members with web holes of different widths were developed using the ANSYS program. The simulation results show that the compressive behaviours obtained from FE analyses are in good agreement with test results. Then, combined with test data, a total of 412 FE parametric analyses were conducted to predict the proportional re-lationships between the axial capacities of compression members with web holes and those without web holes, and the hole impact coefficient formulas were correspondingly derived which differ from the previous re-searcher's contribution. Based on the hole impact coefficient formulas and the direct strength method (DSM) of CFS compression members without web holes in AISI S100-2016, the DSM formulas of CFS compression members with web holes were developed, in which the elastic critical buckling stress of CFS compression members with web holes was not necessary to be calculated.

关键词 ：

Web holes of different widths Finite element (FE) analysis Axial compression test Hole impact coefficient Cold-formed steel compression members Direct strength method (DSM)

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Sentiment classification can explore the opinions expressed by people and help them make better decisions. With the increasing of multimodal contents on the web, such as text, image, audio and video, how to make full use of them is important in many tasks, including sentiment classification. This paper focuses on the text and image. Previous work cannot capture the fine-grained features of images, and those models bring a lot of noise during feature fusion. In this work, we propose a novel multimodal sentiment classification model based on gated attention mechanism. The image feature is used to emphasize the text segment by the attention mechanism and it allows the model to focus on the text that affects the sentiment polarity. Moreover, the gating mechanism enables the model to retain useful image information while ignoring the noise introduced during the fusion of image and text. The experiment results on Yelp multimodal dataset show that our model outperforms the previous SOTA model. And the ablation experiment results further prove the effectiveness of different strategies in the proposed model. (C) 2022 Elsevier B.V. All rights reserved.

关键词 ：

Convolutional neural network Multimodal sentiment classification Gated attention mechanism Feature fusion

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本发明公开了一种基于云平台的机器人关节综合性能测试方法，该云平台采用分层的体系架构，从下至上分为信息感知层、设备接入层、数据处理层、应用服务层。信息感知层负责关节测试信息的采集。设备接入层负责信息感知层中设备的接入与管理。数据处理层负责将上传的关节测试数据和web平台的数据进行处理。应用服务层提供web服务与API接口。基于上述云平台进行的机器人关节综合性能的测试方法，包括传动误差测试方法、回差的测试方法以及性能参数测试方法；本发明优化了机器人关节的测试流程，实现了智能化、自动化，解决了无法在不破化关节结构的情况下进行综合性能测试的困难，并且使测试结果更接近关节的实际工作状态。

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In order to improve the construction efficiency and precision of prefabricated steel structures, and effectively protect the main members of the structures in the earthquake, a new form of joint was proposed in this study. This new earthquake-resilient high ductility prefabricated opening-web steel channel beam-column joint (HDPSJ) was designed on the basis of the concepts of modular construction, damage control and buckling restraint. A total of six joint specimens were tested under low-cycle load to study the seismic properties and post-earthquake restoration properties of the new joint, and the curves of hysteresis, skeleton and strain, and the energy dissipation ability of specimen were obtained. This paper mainly studied influences of the thickness of the flange cover plate (FCP), the weakened degree of FCPs and the quantity of bolts connecting the FCP on the seismic properties and restoration properties of joints. U-shaped web connecting plate (UWCP) was applied to this type of joint to restraint the buckling of FCPs. The results show that the HDPSJs have excellent bearing capacity, ductility and post-earthquake repair capacity, and the indexes of the restored joints are still up to the seismic standards; the yield load of the joint principally depends on the thickness of FCP. The slip of FCP is mainly determined by the number of flange connecting bolts; the UWCP can effectively improve the ductility of the joint. The hysteretic property of the joint is stable during the low-cycle constant amplitude load, which shows the joint also has the function of a damper.

关键词 ：

High ductility Seismic property Post-earthquake repair Opening-web steel channel beam-column joint Damage control Buckling restrained

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随着数字经济时代的到来,区块链技术成为热门的研究领域.对区块链相关研究热点和知识结构进行分析,有助于厘清研究脉络,为后续研究提供参考.以中国知网(CNKI)和Web of Science(WOS)数据库收录的区块链相关文献为研究对象,采用文献计量方法对区块链相关的科研力量分布、核心作者合作网络以及关键词共现网络进行分析.论文研究发现:国外学者相比国内学者文章数量增速更快,国内外相关文献集中在计算机科学、信息技术、经济与管理科学领域;国外学者之间交流密切,合作较多,而国内学者之间尽管存在一定的交流合作,但研究团队规模较小,有待于进一步加强合作;国内相关文献高产作者和高被引作者基本匹配,国外相关文献高产作者和高被引作者失配;物联网、大数据等技术的发展推动了区块链技术的科技创新和进步;区块链相关文献知识结构与区块链技术的发展进程高度相关,是区块链1.0/2.0/3.0的体现,包括区块链技术的优化创新、数字货币、区块链金融与智能合约、区块链技术的其他应用.

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目的根据病例分析可知冠脉顺应性对血流储备分数(FFR)有重要的影响。为了探究冠脉顺应性对于FFR影响的量化规律,从群体和个体两个层面定量研究冠脉顺应性对于FFR的影响。方法在群体分析层面,运用荟萃分析对PubMed和Web of Science数据库中满足质量要求的文献进行合并分析,

关键词 ：

数值模拟研究 顺应性 流动力学

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自习近平总书记于2013年9月提出建设"丝绸之路经济带"和"21世纪海上丝绸之路"的合作倡议后,"丝绸之路"这个具有悠久历史的概念又一次引起了公众和学界的注目.本文运用Citespace文献可视化软件,对Web of Science收录的从2014年-2020年以"丝绸之路"为关键词的文献做了可视化分析,以此来呈现近六年来有关"丝绸之路"的研究趋势.其中包括"关键词知识图谱""研究热点演进图谱""文献共被引知识图谱"等等,勾勒了近六年国际丝绸之路研究的总体图景,并展示了研究热点的演进以及中国学者和机构对丝绸之路国际研究的影响,对中国学者的丝绸之路研究的国际视域以及文献脉络掌握都具有很强的支撑和参考作用.

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Webshell是一种隐蔽性较高的Web攻击工具, 其作用是获取服务器的操作权限. 在编写Webshell时, 攻击者通过一系列免杀技术来绕过防火墙, 这导致现有方法检测Webshell的效果不佳. 针对这一现状, 本文从文本分类的角度出发, 提出一种基于Bi-GRU的Webshell检测方法. 首先将网页脚本文件进行编译, 得到opcode指令; 然后,通过word2vec算法将指令转换为特征向量; 最后, 使用多种深度学习模型进行训练, 以准确率、误报率、漏报率作为评估标准. 最终实验结果表明, Bi-GRU检测效果优于其他算法模型, 证明该算法是可行的.

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With an increasing number of Geographical Information System (GIS) services publicly available on the Web, the discovery of composite GIS services is promising when novel requirements are to be satisfied. GIS services in the repository like ArcGIS software are organized in a tree hierarchy, where a parent node represents a categorial GIS service with a coarser-granularity than its child GIS services, while leaf nodes correspond to atomic and exercisable GIS services. In this setting, discovering appropriate atomic GIS services is challenging. To remedy this issue, this paper proposes a composite GIS service discovery mechanism. Specifically, for the given requirement, select the parent nodes that take the given input parameters as input and remove their inactivated children. Use remaining children to build the network and repeat the previous operation until finding the services that contain the required output. Then record the semantic similarity degree, calculated by services functional description, in this network. By using the simulated annealing algorithm, a composite GIS services solution will be recommended from this semantic network. Evaluation results demonstrate that our approach could give more significant solution compared with the state-of-the-art techniques.

关键词 ：

service discovery Composite GIS service semantic similarity

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