检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

虚实融合网络空间安全综述

中国科学：信息科学 2024年第4期54卷 817-852页

作者：赵沁平周忠梁晓辉李帅汪淼王焱中关村实验室北京100094

在计算机与网络基础设施不断发展的推动下,越来越多的人类活动从物理世界向数字世界迁移,产生了构建新型虚实融合网络空间的动因和思想,增强现实、数字孪生、元宇宙等相继成为国际关注热点.虚实融合网络以互联网、物联网为基础,进一步... 详细信息

在计算机与网络基础设施不断发展的推动下,越来越多的人类活动从物理世界向数字世界迁移,产生了构建新型虚实融合网络空间的动因和思想,增强现实、数字孪生、元宇宙等相继成为国际关注热点.虚实融合网络以互联网、物联网为基础,进一步将具有独立身份的计算机、各种物理对象及其数字孪生,以及计算机生成的数字原生对象进行互联,将物理世界和人类世界与数字世界贯通,成为“泛联网”,形成人、机、物泛联互通的虚实融合网络空间,带来全新的大众体验、社交形态、生产模式和数字经济发展路径.这种新型网络空间极大地拓展了互联网、物联网的空间边界和应用领域,同时也带来了新的安全与隐私保护问题.本文首先介绍了泛联网与虚实融合网络空间的概念及架构,分析其存在的安全与隐私风险,然后从用户认证与权限控制、数据安全、隐私保护、感知与交互安全、关键基础设施与软硬件安全、应用安全与网络空间治理等方面的国际研究现状和发展趋势进行综述,最后给出需要解决的十个问题.

关键词：虚实融合网络空间泛联网数字孪生安全隐私

05Cr17Ni4Cu4Nb钢棒加工异常断屑分析

在线全文

学校读者我要写书评

暂无评论

热加工工艺 2024年第9期53卷 149-151页

作者：范芳雄朱晓锋梁晓辉洛阳双瑞特种装备有限公司河南洛阳471000 洛阳船舶材料研究所河南洛阳471000

采用金相(OM)、能谱(EDS)和X射线衍射(XRD)研究了异常断屑区域的显微组织,对不同显微组织进行了EDS成分分析和XRD物相分析。结果显示,产品断屑异常区域金相组织存在明显异常,组织为回火索氏体+白色块状组织。能谱分析显示,白色块状组织... 详细信息

采用金相(OM)、能谱(EDS)和X射线衍射(XRD)研究了异常断屑区域的显微组织,对不同显微组织进行了EDS成分分析和XRD物相分析。结果显示,产品断屑异常区域金相组织存在明显异常,组织为回火索氏体+白色块状组织。能谱分析显示,白色块状组织与基体具有一致的成分。XRD分析显示,白色块状组织为γ-Fe+M/α-Fe。综合分析判断,05Cr17Ni4Cu4Nb钢棒在最终热处理后经历了局部异常加热过程,使材料局部发生奥氏体化,并在随后的冷却过程中部分转变为马氏体组织,由于该组织塑性较低,导致在车削加工过程中出现异常断屑现象。

关键词：沉淀硬化不锈钢马氏体逆变奥氏体车削加工组织异常

Edge-Preserving Depth Map Super-Resolution with Intensity Guidance

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2019年第1期28卷 51-56页

作者： Xiaochuan Wang xiaohui liang State Key Laboratory of Virtual Reality Technology and System Beihang University

Depth discontinuity edge affects the visual quality of synthesized images in 3D image ***,it suffers from accuracy degradation when up-sampled from low-resolution depth maps,especially at large scaling *** preserve the accuracy of depth discontinuity,a novel joint bilateral depth super-resolution with intensity guidance method is ***,the fast local intensity classification is exploited to estimate depth coefficients in joint bilateral up-sampling for depth maps,so as to eliminate depth discontinuity edge ***,the proposed method is accelerated on graphic processing units(GPUs)to meet the requirement of realtime *** demonstrate that our method can preserve the accuracy of depth discontinuity edges after super resolution,leveraging the visual quality of synthesized image in 3D image warping.

关键词： super resolution depth map joint bilateral filter 3D image warping synthesized image

在线全文

学校读者我要写书评

暂无评论

论东北地区生态安全的时代价值

沈阳干部学刊 2024年第3期26卷 37-40页

作者：孙苓梁晓晖大连海事大学马克思主义学院辽宁大连116026

筑牢东北地区生态安全屏障是深刻理解把握习近平总书记对东北全面振兴的重大战略擘画和深远考量,也是东北地区的重大责任。东北地区生态安全具有重要的时代意义,同时也面临着亟待解决的问题,必须充分运用各种手段,优化产业结构,系统解... 详细信息

筑牢东北地区生态安全屏障是深刻理解把握习近平总书记对东北全面振兴的重大战略擘画和深远考量,也是东北地区的重大责任。东北地区生态安全具有重要的时代意义,同时也面临着亟待解决的问题,必须充分运用各种手段,优化产业结构,系统解决关键问题,加大生态系统保护力度,充分发挥东北地区生态安全的时代价值。

关键词：东北地区生态安全时代价值

Study of Microwave Absorbing Performances of Nanometer Fe-Al Solid solution

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 533-534页

作者： xiaohui Wang Xiaoping liang Shaobo Xin Tianjin Municipal Key Lab of Fiber Modification and Functional Fiber Tianjin Polytechnic University Tianjin 300160 China

In this paper,Fe-Al solid solution was prepared by mechanical alloying technology,and Fe-Al powder was dispersed into unsaturated polyester (UP) with different contents as absorber to form mixture *** results indicate that the alloying process is almost accomplished and most of the particles are ***,the microwave absorbability of Fe-Al-UP samples in frequency from 0.3 MHz to 1.5 GHz was *** results indicate that the more the absorber,the better the absorbing *** absorbing property of Fe-50Al-UP was slightly higher than Fe-28Al-UP.

关键词： Fe-Al solid solution nanometer mechanical alloying microwave absorbing property

GENDER EQUALITY IN CHINA'S OVERSEAS INVESTMENT: CASE STUDIES ON CHINESE TEXTILE AND APPAREL ENTERPRISES IN VIETNAM, MYANMAR, AND BANGLADESH

在线全文

学校读者我要写书评

暂无评论

Frontiers of Law in China-Selected Publications from Chinese Universities 2019年第4期14卷 478-499页

作者： liang xiaohui China Textile Information Center Beijing 100020China

With the progressive implementation of the Belt and Road Initiative,the Chinese textile and apparel sector has extended investments in many Southeast Asian countries,of which Vietnam,Myanmar,and Bangladesh are the most prominent ***,the impacts of Chinese-invested textile and apparel companies on local female workers have become more important and *** paper uses data accumulated in a survey project conducted in 20 Chinese-invested textile and apparel enterprises to present the on-site situation of gender equality performance in Chinese textile and apparel investment in these three *** finds that,despite quick progress and sporadic good practice,Chinese textile and apparel enterprises face challenges in gender equality at both the policy and practice *** concludes that gender equality is critical for China's responsible overseas investment and local social development,and Chinese enterprises must go beyond legal compliance in dealing with gender *** so doing,they must realize that awareness raising and gender-sensitive management mechanisms must be the core and long-term measures to address gender equality challenges.

关键词： overseas investment gender equality Vietnam Myanmar Bangladesh

Ultraviolet Spectrum of Nanometer Zinc Oxide Prepared by Sol-Gel Process

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

稀有金属材料与工程 2006年第A3期35卷 567-569页

作者： Xiaoping liang xiaohui Wang Shaobo Xin Yajin Liu Tianjin Municipal Key Lab of Fiber Modification and Functional Fiber Tianjin Polytechnic University Tianjin 300160 China

Zinc oxide nanometer powders were prepared by the sol-gel *** sol and the powders characteristic of absorbing ultraviolet light is detected by the ultraviolet *** results indicate the concentration of zinc acetate dihydrate in isopropyl alcohol solution and the final pH value of the aqueous sol have effect on the UV absorption of the sol. The nanometer zinc oxide has strong absorption at 200 nm～360 nm,and over 90% ultraviolet in the range of 200 nm～360 nm wavelength are *** characteristic of absorbing ultraviolet light of zinc oxide increases as the particle size of zinc oxide decreases.

关键词： sol-gel zinc oxide nanometer UV absorption

No-reference synthetic image quality assessment with convolutional neural network and local image saliency

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2019年第2期5卷 193-208页

作者： Xiaochuan Wang xiaohui liang Bailin Yang Frederick W.B.Li State Kay Laboratory of Virtual Reality Technology and System Beihang UniversityBeijing 100191China School of Computer Science&Information Engineering Zhejiang Gongshang UniversityHangzhou 310018China Department of Computer Science University of DurhamUnited Kingdom

Depth-image-based rendering(DIBR) is widely used in 3 DTV, free-viewpoint video, and interactive 3 D graphics applications. Typically, synthetic images generated by DIBR-based systems incorporate various distortions, particularly geometric distortions induced by object dis-occlusion. Ensuring the quality of synthetic images is critical to maintaining adequate system service. However, traditional 2 D image quality metrics are ineffective for evaluating synthetic images as they are not sensitive to geometric distortion. In this paper, we propose a novel no-reference image quality assessment method for synthetic images based on convolutional neural networks, introducing local image saliency as prediction weights. Due to the lack of existing training data, we construct a new DIBR synthetic image dataset as part of our contribution. Experiments were conducted on both the public benchmark IRCCyN/IVC DIBR image dataset and our own dataset. Results demonstrate that our proposed metric outperforms traditional 2 D image quality metrics and state-of-the-art DIBR-related metrics.

关键词： image quality assessment synthetic image depth-image-based rendering(DIBR) convolutional neural network local image saliency

Cumulus cloud modeling from images based on VAE-GAN

在线全文

学校读者我要写书评

暂无评论

Virtual Reality & Intelligent Hardware 2021年第2期3卷 171-181页

作者： Zili ZHANG Yunchi CEN Fan ZHANG xiaohui liang State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Department of Computer Science and Engineering Shijiazhuang UniversityShijiazhuang 050035China

Background Cumulus clouds are important elements in creating virtual outdoor *** cumulus clouds that have a specific shape is difficult owing to the fluid nature of the ***-based modeling is an efficient method to solve this *** of the complexity of cloud shapes,the task of modeling the cloud from a single image remains in the development *** In this study,a deep learning-based method was developed to address the problem of modeling 3D cumulus clouds from a single *** method employs a three-dimensional autoencoder network that combines the variational autoencoder and the generative adversarial ***,a 3D cloud shape is mapped into a unique hidden space using the proposed ***,the parameters of the decoder are fixed.A shape reconstruction network is proposed for use instead of the encoder part,and it is trained with rendered *** train the presented models,we constructed a 3D cumulus dataset that included 2003D cumulus *** cumulus clouds were rendered under different lighting *** The qualitative experiments showed that the proposed autoencoder method can learn more structural details of 3D cumulus shapes than existing ***,some modeling experiments on rendering images demonstrated the effectiveness of the reconstruction *** The proposed autoencoder network learns the latent space of 3D cumulus cloud *** presented reconstruction architecture models a cloud from a single *** demonstrated the effectiveness of the two models.

关键词： 3D cloud model 3D autoencoder network Generative adversarial network