检索结果-南通市图书馆

Lightweight and Manageable Digital Evidence Preservation System on Bitcoin

Journal of Computer science & technology 2018年第3期33卷 568-586页

作者： Mingming Wang Qianhong wu Bo Qin Qin Wang jianwei Liu Zhenyu Guan school of Electronic and information engineering Beihang University Beijing 100191 China school of information Renmin University of China Beijing 100872 China

An effective and secure system used for evidence preservation is essential to possess the properties of anti- loss, anti-forgery, anti-tamper and perfect verifiability. Traditional architecture which relies on centralized cloud storage is depressingly beset by the security problems such as incomplete confidence and unreliable regulation. Moreover, an expensive, inefficient and incompatible design impedes the effort of evidence preservation. In contrast, the decentralized blockchain network is qualified as a perfect replacement for its secure anonymity, irrevocable commitment, and transparent traceability. Combining with subliminal channels in blockchain, we have weaved the transaction network with newly designed evidence audit network. In this paper, we have presented and implemented a lightweight digital evidence-preservation architecture which possesses the features of privacy-anonymity, audit-transparency, function-scalability and operation-lightweight. The anonymity is naturally formed from the cryptographic design, since the cipher evidence under encrypted cryptosystem and hash-based functions leakages nothing to the public. Covert channels are efficiently excavated to optimize the cost, connectivity and security of the framework, transforming the great computation power of Bitcoin network to the value of credit. The transparency used for audit, which relates to the proof of existence, comes from instant timestamps and irreversible hash functions in mature blockchain network. The scalability is represented by the evidence chain interacted with the original blockchain, and the extended chains on top of mainchain will cover the most of auditors in different institutions. And the lightweight, which is equal to low-cost, is derived from our fine-grained hierarchical services. At last, analyses of efficiency, security, and availability have shown the complete accomplishment of our system.

关键词： blockchain covert channel data auditing digital evidence

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

泡沫混凝土填充圆钢管的轴压力学性能

引用

浙江大学学报（工学版） 2019年第10期53卷 1927-1935,1945页

作者：支旭东郭梦慧王臣武启剑哈尔滨工业大学结构工程灾变与控制教育部重点实验室黑龙江哈尔滨150090 哈尔滨工业大学土木工程智能防灾减灾工信部重点实验室黑龙江哈尔滨150090

采用试验和有限元模拟方法,研究泡沫混凝土填充圆钢管构件在轴压荷载作用下的力学性能.通过轴压试验,分析短柱构件的耗能能力和长柱构件的轴压承载力,短柱构件发生叠缩破坏变形模式,耗能能力随着泡沫混凝土密度的提高而显著增强,长柱构... 详细信息

采用试验和有限元模拟方法,研究泡沫混凝土填充圆钢管构件在轴压荷载作用下的力学性能.通过轴压试验,分析短柱构件的耗能能力和长柱构件的轴压承载力,短柱构件发生叠缩破坏变形模式,耗能能力随着泡沫混凝土密度的提高而显著增强,长柱构件发生整体失稳破坏,稳定承载力随着泡沫混凝土密度的增大而增大.基于ABAQUS的Explicit求解器,建立泡沫混凝土填充圆钢管构件的数值模型,获得的模拟结果与试验结果吻合良好.开展参数分析,讨论径厚比、长细比及填充泡沫混凝土密度等因素对长柱构件承载能力的影响.研究结果表明:长柱构件的稳定承载力随着长细比和径厚比的增大而减小,随着填充的泡沫混凝土密度的增大而增大.基于Perry-Robertson公式,推导了泡沫混凝土填充圆钢管长柱构件的稳定承载力公式.预测结果表明,该公式能够很好地预测长柱构件的稳定承载力.

关键词：泡沫混凝土圆钢管轴压稳定性 Perry-Robertson

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

Performance of an M-QAM full-duplex wireless system with a nonlinear amplifier

引用

science china(information sciences) 2016年第10期59卷 103-111页

作者： Zhaojun HE Wanzhi MA Shihai SHAO Fei wu Chaojin QING Youxi TANG National Key Laboratory and technology on Communications University of Electronic Science and Technology of China school of Electrical and information engineering Xihua University

The effect of amplifier nonlinearity is analyzed for M-QAM full-duplex communications in additive white Gaussian noise channels. Two classical memoryless nonlinear amplifier models, i.e., a traveling-wave tube amplifier and a solid-state power amplifier, are considered. An analytical expression for the bit error ratio is derived using a characteristic function and numerical integration. Theoretical results show perfect agreement with those obtained by simulation. The analytical results could be used to evaluate the degradation in performance of an M-QAM full-duplex system caused by amplifier nonlinearity, and will be helpful in finding the optimal static operating point of an amplifier.

关键词： full-duplex amplifier nonlinear distortion bit error ratio amplitude error phase error

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

Outage-driven link selection for secure buffer-aided networks

引用

science china(information sciences) 2022年第8期65卷 197-212页

作者： Dawei WANG Tianmi HE Fuhui ZHOU Julian CHENG Ruonan ZHANG Qihui wu school of Electronics and information Northwestern Polytechnical University College of Electronic and information engineering Nanjing University of Aeronautics and Astronautics National Mobile Communications Research Laboratory Southeast University school of engineering The University of British Columbia Research & Development Institute of Northwestern Polytechnical university in Shenzhen Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Nanjing University of Aeronautics and Astronautics

In this paper, we investigate secure communication in a two-hop wireless network, where multiple buffer-aided relays assist to securely forward data from the sender to the destination threatened by a passive eavesdropper. To satisfy the security and delay requirements, we propose a novel link selection policy without the instantaneous wiretap channel state information. Different from the most current link selection policies,the proposed link selection policy is designed by joint considering the link secrecy outage probability and the buffer states. To evaluate the secrecy performance, we first characterize the system state transition matrix and the stationary state probability, and then derive the closed-form expressions for the secrecy outage probability and the secrecy rate. Moreover, we formulate a framework based on the queuing theory to analyze the end-to-end information delay at the source, the relays, and the queues, and derive the closed-form expression for the information delay. Finally, we conduct simulations to validate our theoretical performance analysis, and verify the performance improvement of the proposed outage-driven secure transmission scheme in terms of secrecy outage probability and information delay.

关键词： buffer-aided relay information delay link selection secrecy outage probability

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

Blockchain-Based Secure Crowdsourcing in Wireless IoT

引用

Journal of Communications and information Networks 2022年第1期7卷 23-36页

作者： Daquan Feng Long Zhang Shengli Zhang Qihui wu Xianggen Xia Guangdong Province engineering Laboratory for Digital Creative technology Shenzhen UniversityShenzhen 518060China National Key Laboratory of science and technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China College of Electronic and information engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Electrical and Computer engineering University of DelawareNewarkDE 19716USA

With the explosive growth of interconnected smart devices and sensors,the Internet has been entering the Internet of things(IoT)era and revolutionizing many aspects of our daily life. Meanwhile, crowdsourcing has been considered as a promising technology to realize collaborative intelligence. Therefore, more and more IoT-based crowdsourcing applications are emerged to take advantages of the widely distributed IoT devices to sense, collect, and analyze data with the aim to solve complex and nontrivial tasks. However,there exist many technical challenges to be addressed in the IoT-based crowdsourcing, such as security, privacy, and incentive provision. In this paper, we propose a blockchain-based architecture as an integrated solution to realize the secure and trustworthy crowdsourcing in wireless IoT. We first overview the challenges in the traditional crowdsourcing system. Then, we briefly introduce the background of the blockchain and smart contract, and propose a blockchain-based crowdsourcing architecture. In particular, we elaborate the utilization of smart contract on the specific phases of crowdsourcing. By deploying the smart contract instance, we confirm the proposed blockchain-based architecture is feasible.

关键词： crowdsourcing blockchain wireless IoT security privacy incentive

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Illuminating Recommendation by Understanding the Explicit Item Relations

引用

Journal of Computer science & technology 2018年第4期33卷 739-755页

作者： Qi Liu Hong-Ke Zhao Le wu Zhi Li En-Hong Chen Anhui Province Key Laboratory of Big Data Analysis and Application University of Science and Technology of China Hefei 230027 China school of Computer and information Hefei University of Technology Hefei 230009 China school of Software engineering University of Science and Technology of China Hefei 230051 China

Recent years have witnessed the prevalence of recommender systems in various fields, which provide a personalized recommendation list for each user based on various kinds of information. For quite a long time, most researchers have been pursing recommendation performances with predefined metrics, e.g., accuracy. However, in real-world applications, users select items from a huge item list by considering their internal personalized demand and external constraints. Thus, we argue that explicitly modeling the complex relations among items under domain-specific applications is an indispensable part for enhancing the recommendations. Actually, in this area, researchers have done some work to understand the item relations gradually from ＂implicit＂ to ＂explicit＂ views when recommending. To this end, in this paper, we conduct a survey of these recent advances on recommender systems from the perspective of the explicit item relation understanding. We organize these relevant studies from three types of item relations, i.e., combination-effect relations, sequence-dependence relations, and external-constraint relations. Specifically, the combination-effect relation and the sequence-dependence relation based work models the intra-group intrinsic relations of items from the user demand perspective, and the external-constraint relation emphasizes the external requirements for items. After that, we also propose our opinions on the open issues along the line of understanding item relations and suggest some future research directions in recommendation area.

关键词： recommender system item relation recommendation interpretability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Prediction method for energy con sumption per ton of fused magnesium furnaces using data driven and mechanism model

引用

Control Theory and technology 2019年第1期17卷 24-36页

作者： Dan GUO Zhiwei wu Tianyou CHAI Jie YANG Jinliang DING State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang Liaoning 110819 China National engineering Research Center of Metallurgical Automation (Shenyang) Shenyang Liaoning 7 70879 China

The electric energy consumed in every ton of acceptable product, namely energy consumption per ton (ECT), is an important overall index for the production process of a fused magnesium furnace. The furnace is the equipment for producing the fused magnesia. The ECT value depends on the current in the smelting process. The optimal operation for a fused magnesium furnace is supposed to have the ECT as low as possible, where the key is to predict ECT accurately. By introducing an unknown high-order non linear term, this paper builds a dynamic ECT model for differe nt production batches based on the static ECT model for one batch. The average current is taken as the input of the dynamic ECT model, which is composed of the unknown high-order nonlinear term and a nonlinear model with unknown parameters. The order of the nonlinear term is determined by the distance correlatio n and the nonlinear term is estimated by the stochastic con figuration n etwork, while the parameters of the non linear model is ide ntified by the least square method. The estimation of the nonli near term alter nates with the parameter identification. This paper proposes a prediction method for ECT, which is composed of the order identification of the non linear term, the alternating identification of the model and the ECT prediction model. The simulation experiments are conducted by the on-site data, and the results verify the effectiveness of the proposed prediction method.

关键词： Fused magnesia energy consumption per ton alternating identification stochastic configuration network distance correlation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高校院级平台大型仪器设备年度使用报告的建立及作用研究

引用

实验科学与技术 2024年第1期22卷 138-142页

作者：王娜吴洋卿大咏罗米娜西南石油大学化学化工学院成都610500

大型仪器设备缺少精细化管理以及开放共享不足一直是各高校设备管理中存在的主要问题。为了解决以上问题,通过对学校的分析测试共享平台网络大数据进行统计、归类、分析和总结,建立院级平台各仪器设备的年度使用报告。年度使用报告的建... 详细信息

大型仪器设备缺少精细化管理以及开放共享不足一直是各高校设备管理中存在的主要问题。为了解决以上问题,通过对学校的分析测试共享平台网络大数据进行统计、归类、分析和总结,建立院级平台各仪器设备的年度使用报告。年度使用报告的建立以每台设备为核心,通过对设备的年度使用情况、每月的使用机时、用户使用情况、维修情况、人才培养、科研成果等进行全面的分析,可及时发现仪器设备在管理流程中的漏洞,制定纠正措施,有助于构建精确的管理流程和策略,提升管理水平,促进仪器开放共享。

关键词：高校大型仪器精细化管理大数据年度使用报告

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

某FAB厂房结构微振动有限元计算与分析

引用

科学技术创新 2024年第22期 173-176页

作者：万曦代剑英吴芳信息产业电子第十一设计研究院科技工程股份有限公司陕西西安中国建筑西北设计研究院有限公司陕西西安华南农业大学广东广州

为研究电子厂房防微振结构设计方法,在对该厂区进行场地环境振动实测后,采用了有限元软件建模计算并分析了半导体厂房结构的微振动水平。结果发现:厂房二层各区域的振动预测均满足微振要求VC-B和VC-C标准;各测点的振动峰值主要集中在2 H... 详细信息

为研究电子厂房防微振结构设计方法,在对该厂区进行场地环境振动实测后,采用了有限元软件建模计算并分析了半导体厂房结构的微振动水平。结果发现:厂房二层各区域的振动预测均满足微振要求VC-B和VC-C标准;各测点的振动峰值主要集中在2 Hz、12.5 Hz、25 Hz三个频段附近。分析预测结果可为类似的项目提供经验并指导结构设计。

关键词：有限元仿真环境振动电子厂房

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

Fuzzy super-twisting sliding mode control for municipal wastewater nitrification process

引用

science china(Technological sciences) 2022年第10期65卷 2420-2428页

作者： HAN HongGui WANG Tong SUN HaoYuan wu XiaoLong LI Wen QIAO JunFei Faculty of information technology Beijing University of TechnologyBeijing 100124China school of Mechanical and Materials engineering North China University of TechnologyBeijing 100041China

A fuzzy super-twisting algorithm sliding mode controller is developed for the dissolved oxygen concentration in municipal wastewater nitrification process. First, a fuzzy neural network(FNN) model is designed to approach the oxygen dynamics with unmeasurable disturbances, then the established model consists of the nominal system model and the modelling error. Second,based on the FNN model, a super-twisting sliding mode controller is employed to stabilize the nominal system and to suppress the modelling error. Moreover, the stability of the system is investigated and an adaption law is applied to ensure the robustness of the closed-loop system. Finally, the comparison experiments on benchmark simulation model no. 2(BSM2) of wastewater treatment show the advantages of the proposed method in multiple-units oxygen concentration control.

关键词： fuzzy neural network super-twisting sliding mode control robust multivariable control municipal wastewater nitrification process

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

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：