检索结果-南通市图书馆

Practical cloud storage auditing using serverless computing

Science China(Information Sciences) 2024年第3期67卷 33-47页

作者： Fei CHEN Jianquan CAI Tao XIANG xiaofeng liao College of Computer Science and Software Engineering Shenzhen University College of Computer Science Chongqing University

Cloud storage auditing research is dedicated to solving the data integrity problem of outsourced storage on the cloud. In recent years, researchers have proposed various cloud storage auditing schemes using different techniques. While these studies are elegant in theory, they assume an ideal cloud storage model;that is, they assume that the cloud provides the storage and compute interfaces as required by the proposed schemes. However, this does not hold for mainstream cloud storage systems because these systems only provide read and write interfaces but not the compute interface. To bridge this gap, this work proposes a serverless computing-based cloud storage auditing system for existing mainstream cloud object storage. The proposed system leverages existing cloud storage auditing schemes as a basic building block and makes two adaptations. One is that we use the read interface of cloud object storage to support block data requests in a traditional cloud storage auditing scheme. Another is that we employ the serverless computing paradigm to support block data computation as traditionally required. Leveraging the characteristics of serverless computing, the proposed system realizes economical, pay-as-you-go cloud storage auditing. The proposed system also supports mainstream cloud storage upper layer applications(e.g., file preview) by not modifying the data formats when embedding authentication tags for later auditing. We prototyped and open-sourced the proposed system to a mainstream cloud service, i.e., Tencent Cloud. Experimental results show that the proposed system is efficient and promising for practical use. For 40 GB of data, auditing takes approximately 98 s using serverless computation. The economic cost is 120.48 CNY per year, of which serverless computing only accounts for 46%. In contrast, no existing studies reported cloud storage auditing results for real-world cloud services.

关键词： cloud storage auditing serverless computing object storage usability

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Period analysis of the Logistic map for the finite field

引用

Science China(Information Sciences) 2017年第2期60卷 49-63页

作者： Bo YANG xiaofeng liao College of Electronic and Information Engineering Southwest University

Usually, the security of traditional cryptography which works on integer numbers and chaotic cryptosystem which works on real numbers is worthy of study. But the classical chaotic map over the real domain has a disadvantage that the calculation accuracy of the floating point number can be doubled when the map is implemented by computer. This is a serious drawback for practical application. The Logistic map is a classical chaotic system and it has been used as a chaotic cipher in the real number field. This inevitably leads to the degradation of finite precision under computer environment, and it is also very difficult to guarantee *** solve these drawbacks, we extend the Logistic map to the finite field. In this paper, we consider the Logistic map for the finite field N = 3~n, and analyze the period property of sequences generated by the Logistic map over ZN. Moreover, we discuss the control parameters which may influence the behavior of the mapping, and show that the Logistic map over ZN may be suitable for application by performance analysis. Ultimately, we find that there exists an automorphic map between two Logistic maps with the different control parameters, which makes them suitable for sequence generator in cryptosystem. The automorphic sequence generated algorithm based on the Logistic map over ZN is designed and analyzed in detail. These sequences can be used in the pseudorandom number generator, the chaotic stream cipher, and the chaotic block cipher, etc.

关键词： chaos Logistic map period analysis sequence generated algorithm Galois ring

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于组合结构的逻辑回归点击预测算法

引用

计算机科学 2024年第2期51卷 73-78页

作者：郭尚志廖晓峰鲜开义重庆大学计算机学院重庆400030

随着互联网和广告平台的飞速发展,面对海量的广告信息,为了提升用户点击率,提出一种改进的基于组合结构的逻辑回归点击预测算法LRCS(Logical Regression of Combination Structure)。该算法基于不同类别特征广告受众可能不同的特点,首先... 详细信息

随着互联网和广告平台的飞速发展,面对海量的广告信息,为了提升用户点击率,提出一种改进的基于组合结构的逻辑回归点击预测算法LRCS(Logical Regression of Combination Structure)。该算法基于不同类别特征广告受众可能不同的特点,首先,采用FM进行特征组合,产生两类组合特征;其次,将一类特征组合作为聚类算法的输入进行聚类;最后,将另一类特征组合输入由聚类产生的分段GBDT+逻辑回归组合的模型中进行预测。在两个公开数据集中进行了多角度验证,结果表明与其他几类常用的点击预测算法相比,LRCS在点击预测上有一定的性能提升。

关键词：逻辑回归特征组合聚类组合推荐人工智能智能制造

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Event-Triggered Differentially Private Average Consensus for Multi-agent Network

引用

IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 75-83页

作者： Aijuan Wang xiaofeng liao Haibo He the College of Computer Science Chongqing University the School of Electronics and Information Engineering Southwest University the Department of Electrical Computer and Biomedical EngineeringUniversity of Rhode Island Kingston IEEE Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing

This paper investigates the differentially private problem of the average consensus for a class of discrete-time multi-agent network systems(MANSs). Based on the MANSs,a new distributed differentially private consensus algorithm(DPCA) is developed. To avoid continuous communication between neighboring agents, a kind of intermittent communication strategy depending on an event-triggered function is established in our DPCA. Based on our algorithm, we carry out the detailed analysis including its convergence, its accuracy, its privacy and the trade-off between the accuracy and the privacy level, respectively. It is found that our algorithm preserves the privacy of initial states of all agents in the whole process of consensus computation. The trade-off motivates us to find the best achievable accuracy of our algorithm under the free parameters and the fixed privacy level. Finally, numerical experiment results testify the validity of our theoretical analysis.

关键词： Average consensus differentially private event-triggered communication multi-agent network systems (MANSs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Optimized Sanitization Approach for Minable Data Publication

引用

Big Data Mining and Analytics 2022年第3期5卷 257-269页

作者： Fan Yang xiaofeng liao College of Computer Science Chongqing UniversityChongqing 400044China

Minable data publication is ubiquitous since it is beneficial to sharing/trading data among commercial companies and further facilitates the development of data-driven ***,the minable data publication is often implemented by publishers with limited privacy concerns such that the published dataset is minable by malicious *** prohibits minable data publication since the published data may contain sensitive ***,it is urgently demanded to present some approaches and technologies for reducing the privacy leakage *** this end,in this paper,we propose an optimized sanitization approach for minable data publication(named as SA-MDP).SA-MDP supports association rules mining function while providing privacy protection for specific *** SA-MDP,we consider the trade-off between the data utility and the data privacy in the minable data publication *** address this problem,SA-MDP designs a customized particle swarm optimization(PSO)algorithm,where the optimization objective is determined by both the data utility and the data ***,we take advantage of PSO to produce new particles,which is achieved by random mutation or learning from the best ***,SA-MDP can avoid the solutions being trapped into local ***,we design a proper fitness function to guide the particles to run towards the optimal ***,we present a preprocessing method before the evolution process of the customized PSO algorithm to improve the convergence ***,the proposed SA-MDP approach is performed and verified over several *** experimental results have demonstrated the effectiveness and efficiency of SA-MDP.

关键词： data publication data sanitization association rules hiding evolutionary algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Some characteristics of logistic map over the finite field

引用

Science China(Information Sciences) 2019年第3期62卷 199-201页

作者： Bo YANG xiaofeng liao Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing College of Electronic and Information Engineering Southwest University

Dear editor,Chaotic maps have good characteristics, which include randomness, sensitivity to the initial value,and unpredictability. Hence, there have been many attempts to discuss the dynamic behavior of chaotic maps... 详细信息

关键词： Some characteristics of logistic map over the finite field

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

面向车联网数据持续共享的安全高效联邦学习

引用

计算机研究与发展 2024年第9期61卷 2199-2212页

作者：乐俊青谭州勇张迪刘高向涛廖晓峰重庆大学计算机学院重庆400044 信息物理社会可信服务计算教育部重点实验室(重庆大学) 重庆400044

车联网与人工智能结合推动了自动驾驶汽车的快速发展.分散于不同车辆中的车联网数据共享并用于训练人工智能模型可实现更高效、更可靠的智能驾驶服务.自动驾驶汽车可通过车载摄像头、传感器等持续采集车辆实时信息、道路图像和视频等车... 详细信息

车联网与人工智能结合推动了自动驾驶汽车的快速发展.分散于不同车辆中的车联网数据共享并用于训练人工智能模型可实现更高效、更可靠的智能驾驶服务.自动驾驶汽车可通过车载摄像头、传感器等持续采集车辆实时信息、道路图像和视频等车联网数据,并用于优化更新智能交通模型,弥补车联网数据变化导致的模型准确度下降问题.提出面向车联网环境下数据持续共享的高效安全联邦学习方案SEFL,以解决车联网数据采集低效、数据动态更新导致的灾难性遗忘、模型训练参数导致的隐私泄露等问题.在方案SEFL中,车辆基于全局模型,只采集模型识别率较低的车联网数据,并以最大概率对应的输出作为该样本的标签,完成训练样本自动采集.由于车辆存储空间有限,采集的新样本会覆盖旧样本,导致车辆上数据是动态变化的,传统微调训练方式容易引起灾难性遗忘问题.为此,方案中设计了一种基于双重知识蒸馏的训练算法,确保模型学习到每个样本的知识,使模型保持较高的准确度.此外,为了防止车辆与服务器之间传播的模型参数泄露用户隐私,提出了一种自适应的差分隐私策略来实现客户端级的强隐私保护,同时该方案能最大限度地减少差分隐私噪声对全局模型准确度的负面影响.最后,进行了安全性分析并结合交通标志数据集GTSRB和车辆识别数据集对SEFL方案进行了性能评估.实验结果表明所提出的SEFL方案能提供可靠的强隐私保护和高效的采集策略,并且在模型准确度方面要优于现有基于联邦学习的算法.

关键词：车联网持续共享联邦学习差分隐私隐私保护

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Optimized Vertical Handoff Algorithm Based on Markov Process in Vehicle Heterogeneous Network

引用

China Communications 2015年第4期12卷 106-116页

作者： MA Bin DENG Hong XIE Xianzhong liao xiaofeng School of Computer Science and Technology Chongqing University of Posts and Telecommunications College of Computer Science Chongqing University

In order to solve the problem the existing vertical handoff algorithms of vehicle heterogeneous wireless network do not consider the diversification of network's status, an optimized vertical handoff algorithm based on markov process is proposed and discussed in this paper. This algorithm takes into account that the status transformation of available network will affect the quality of service(Qo S) of vehicle terminal's communication service. Firstly, Markov process is used to predict the transformation of wireless network's status after the decision via transition probability. Then the weights of evaluating parameters will be determined by fuzzy logic method. Finally, by comparing the total incomes of each wireless network, including handoff decision incomes, handoff execution incomes and communication service incomes after handoff, the optimal network to handoff will be selected. Simulation results show that: the algorithm proposed, compared to the existing algorithm, is able to receive a higher level of load balancing and effectively improves the average blocking rate, packet loss rate and ping-pang effect.

关键词： vehicle heterogeneous network vertical handoff markov process fuzzy logic multi-attribute decision

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

四川江油台地电场优势方位角异常核实与分析

引用

四川地震 2024年第1期 7-12页

作者：王玮铭廖晓峰任越霞四川省地震局四川成都610041

针对四川江油台短极距NS与NE方向间的优势方位角在2022年8月15日开始出现的离散异常和2022年11月29日开始出现的跃变异常进行现场核实。通过观测系统检查、环境干扰调查、人为干扰排查、典型干扰分析、异常定量计算和震例回溯,综合分析... 详细信息

针对四川江油台短极距NS与NE方向间的优势方位角在2022年8月15日开始出现的离散异常和2022年11月29日开始出现的跃变异常进行现场核实。通过观测系统检查、环境干扰调查、人为干扰排查、典型干扰分析、异常定量计算和震例回溯,综合分析结果显示:2022年11月29日开始出现的优势方位角数据跃变为人为干扰(电极更换),2022年8月15日至2023年7月出现的优势方位角离散变化可能为地震前兆异常。

关键词：江油台大地电场方位角异常干扰分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

澳洲茄碱通过调控Bcl-2/Bax/caspase-3信号通路促进非小细胞肺癌发生凋亡

引用

南方医科大学学报 2024年第6期44卷 1109-1116页

作者：陈桂玲廖晓凤孙鹏涛岑欢舒盛春李碧晶黎金华广州中医药大学第二附属医院广东广州510120 广东省第二人民医院广东广州510317 南方医科大学生物医学工程学院广东广州510515

目的探讨龙葵活性成分澳洲茄碱对非小细胞肺癌细胞PC9增殖、凋亡的影响。方法体外培养PC9细胞,设对照组(0μmol/L)及澳洲茄碱不同剂量组(0、2、5、10、15、20、25μmol/L),CCK-8试剂盒检测澳洲茄碱对PC9细胞的增殖抑制作用;TMRE检测... 详细信息

目的探讨龙葵活性成分澳洲茄碱对非小细胞肺癌细胞PC9增殖、凋亡的影响。方法体外培养PC9细胞,设对照组(0μmol/L)及澳洲茄碱不同剂量组(0、2、5、10、15、20、25μmol/L),CCK-8试剂盒检测澳洲茄碱对PC9细胞的增殖抑制作用;TMRE检测线粒膜电位;caspase3/7活性试剂盒联合GreenNuc?Caspase-3/Annexin V-mCherry染色检测caspase-3活性;Annexin V-FITC/PI双染法检测细胞凋亡率;给药处理或者使用PTEN抑制剂后,Western blot检测细胞中相关蛋白的表达量。结果与对照组相比,经澳洲茄碱干预24、48、72 h后,PC9细胞的活力均明显降低(P<0.05);经澳洲茄碱干预24 h后,细胞线粒体膜电位明显降低,而细胞凋亡比例明显升高(P<0.05);caspase-3/7活力、活细胞Caspase-3活性及cleaved caspase-3蛋白表达均显著升高(P<0.01);PI3K和Akt磷酸化水平降低(P<0.05);而PTEN、Bax蛋白表达上调(P<0.05);抗凋亡蛋白Bcl-2蛋白的表达下调(P<0.05)。结论澳洲茄碱可通过调控Bcl-2/Bax/caspase-3通路及其上游蛋白活性而抑制PC9细胞增殖,促进其凋亡。

关键词：澳洲茄碱肺癌 Bcl-2/Bax/caspase-3通路同源性磷酸酶-张力蛋白细胞凋亡

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：