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Massively parallel algorithms for fully dynamic all-pairs shortest paths

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Frontiers of computer science 2024年第4期18卷 201-203页

作者： Chilei WANG Qiang-Sheng HUA Hai JIN Chaodong zheng National Engineering Research Center for Big Data technology and System Services Computing Technology and System LabCluster and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Novel Software technology Nanjing UniversityNanjing 210023China

1 Introduction In recent years,the Massively Parallel Computation(MPC)model has gained significant ***,most of distributed and parallel graph algorithms in the MPC model are designed for static graphs[1].In fact,the graphs in the real world are constantly *** size of the real-time changes in these graphs is smaller and more *** graph algorithms[2,3.can deal with graph changes more efficiently[4]than the corresponding static graph ***,most studies on dynamic graph algorithms are limited to the single machine ***,a few parallel dynamic graph algorithms(such as the graph connectivity)in the MPC model[5]have been proposed and shown superiority over their parallel static counterparts.

关键词： dynamic shortest gained

YOLOv5ST:A Lightweight and Fast Scene Text Detector

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computers, Materials & Continua 2024年第4期79卷 909-926页

作者： Yiwei Liu Yingnan Zhao Yi Chen zheng Hu Min Xia School of computer and science Nanjing University of Information Science and TechnologyNanjing210044China School of Automation Nanjing University of Information Science and TechnologyNanjing210044China

Scene text detection is an important task in computer *** this paper,we present YOLOv5 Scene Text(YOLOv5ST),an optimized architecture based on YOLOv5 v6.0 tailored for fast scene text *** primary goal is to enhance inference speed without sacrificing significant detection accuracy,thereby enabling robust performance on resource-constrained devices like drones,closed-circuit television cameras,and other embedded *** achieve this,we propose key modifications to the network architecture to lighten the original backbone and improve feature aggregation,including replacing standard convolution with depth-wise convolution,adopting the C2 sequence module in place of C3.employing Spatial Pyramid Pooling Global(SPPG)instead of Spatial Pyramid Pooling Fast(SPPF)and integrating Bi-directional Feature Pyramid Network(BiFPN)into the *** results demonstrate a remarkable 26%improvement in inference speed compared to the baseline,with only marginal reductions of 1.6%and 4.2%in mean average precision(mAP)at the intersection over union(IoU)thresholds of 0.5 and 0.5:0.95,*** work represents a significant advancement in scene text detection,striking a balance between speed and accuracy,making it well-suited for performance-constrained environments.

关键词： Scene text detection YOLOv5 lightweight object detection

Product Design Strategies Based on the Psychological Features of the Aging People Living in Cities

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Product Design Strategies Based on the Psychological Feature...

Solving the subset sum problem by the quantum Ising model with variational quantum optimization based on conditional values at risk

E-Business·Creative Design·Manufacturing——2009 IEEE 10th International Conference on computer-Aided Industrial Design & Conceptual Design（CAID&CD’2009）

作者： 1 2 Linxin zheng 2 Deyin Qu 1 College of computer science and {3. Zhejiang university Hangzhou Zhejiang Province 3.0027 china 2School of Art Design Zhejiang university of science and {3. Hangzhou Zhejiang Province 3.0023.china

This paper investigated the life style of the aging people living in Hangzhou,Jiaxing and Ningbo and analyzed their consuming tendency and psychological *** of the declines of physiological functions and the changes in the living and working environments,negative emotions such as emptiness,loneliness,depression and self-abasement are discovered with aged *** paper researched and concluded a product design strategy based on aged people according to their psychological features.

关键词： aging people psychological features design

来源： cnki会议评论

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science china(Physics,Mechanics & Astronomy) 2024年第8期67卷 43-55页

作者： Qilin zheng Miaomiao Yu Pingyu Zhu Yan Wang Weihong Luo Ping Xu Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China Hefei National Laboratory Hefei 230088China

The subset sum problem is a combinatorial optimization problem,and its complexity belongs to the nondeterministic polynomial time complete(NP-Complete)*** problem is widely used in encryption,planning or scheduling,and integer *** accurate search algorithm with polynomial time complexity has not been found,which makes it challenging to be solved on classical *** effectively solve this problem,we translate it into the quantum Ising model and solve it with a variational quantum optimization method based on conditional values at *** proposed model needs only n qubits to encode 2ndimensional search space,which can effectively save the encoding quantum *** model inherits the advantages of variational quantum algorithms and can obtain good performance at shallow circuit depths while being robust to noise,and it is convenient to be deployed in the Noisy Intermediate Scale Quantum *** investigate the effects of the scalability,the variational ansatz type,the variational depth,and noise on the ***,we also discuss the performance of the model under different conditional values at *** computer simulation,the scale can reach more than nine *** selecting the noise type,we construct simulators with different QVs and study the performance of the model with *** addition,we deploy the model on a superconducting quantum computer of the Origin Quantum technology Company and successfully solve the subset sum *** model provides a new perspective for solving the subset sum problem.

关键词： subset sum problem quantum Ising model conditional values at risk variational quantum optimization

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A buffer overflow detection and defense method based on RiSC-V instruction set extension

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Cybersecurity 2024年第2期7卷 28-43页

作者： Chang Liu Yan-Jun Wu Jing-zheng Wu Chen Zhao Intelligent Software Research Center Institute of SoftwareChinese Academy of SciencesBejingChina university of Chinese Academy of sciences BeijingChina State Key Laboratory of computer science Institute of SoftwareChinese Academy of SciencesBeijingChina

Buffer overflow poses a serious threat to the memory security of modern operating *** overwrites the con-tents of other memory areas by breaking through the buffer capacity limit,destroys the system execution environ-ment,and provides implementation space for various system attacks such as program control flow *** makes it a wide range of harms.A variety of security technologies have been proposed to deal with system security problems including buffer *** example,No eXecute(NX for short)is a memory management technology commonly used in Harvard *** can refuse the execution of code which residing in a specific memory,and can effectively suppress the abnormal impact of buffer overflow on control ***,in recent years,it has also been used in the field of system security,deriving a series of solutions based on NX technology,such as ExecShield,DEP,StackGuard,***,these security solutions often rely too much on the processor archi-tecture so that the protection coverage is insufficient and the accuracy is *** in the emerging system architecture field represented by RiSC-V,there is still a lack of effective solutions for buffer overflow *** the continuous rapid development of the system architecture,it is urgent to develop defense methods that are applicable to different system application environments and oriented to all executable memory spaces to meet the needs of system security ***,we propose BOP,A new system memory security design method based on RISC-V extended instructions,to build a RISC-V buffer overflow detection and defense system and deal with the buffer overflow threat in *** to this method,NX technology can be combined with program control flow analysis,and Nx bit mechanism can be used to manage the executability of memory space,so as to achieve a more granular detection and defense of buffer overflow attacks that may occur in RISC-V system

关键词： RISc-V Operating system security Buffer overflow Control flow hijacking Nx bit Xibop

A reputation-based blockchain scheme for sustained carbon emission reduction

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science china(Information sciences) 2024年第5期67卷 329-330页

作者： Lixiao ZHOU Changbing TANG zheng BAO Yang LIU Xinghuo YU College of Physics and Electronics Information Engineering Zhejiang Normal University School of computer science and technology Zhejiang Normal University School of Mathematical sciences Zhejiang Normal University School of Engineering RMIT University

Climate change is a global issue that necessitates collective responsibility from all nations. Recently, a blockchainenabled emission trading scheme(ETS) has been proposed for reducing carbon emissions to overcome the drawbacks of centralized methods [1, 2]. However, existing consensus protocols in blockchain have not been well prepared for low energy consumption and high incentive compatibility [3.,which is contrary to the low carbon goal of ETS.

关键词：

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DC系数在目标检测中的应用

计算机工程与应用 2009年第36期45卷 174-176,184页

作者：李敏郑更生武汉科技学院计算机科学学院武汉430073 武汉工程大学计算机科学与工程学院武汉430074

针对基于单片机的无线图像监控系统存在的处理能力差、存储空间有限的缺点,提出了一种基于DC系数的目标检测方法:先对JPEG图像进行部分解码,提取亮度信号的DC系数,得到DC图,然后对相邻两幅DC图进行相减操作,最后对差值DC系数进行分块和... 详细信息

针对基于单片机的无线图像监控系统存在的处理能力差、存储空间有限的缺点,提出了一种基于DC系数的目标检测方法:先对JPEG图像进行部分解码,提取亮度信号的DC系数,得到DC图,然后对相邻两幅DC图进行相减操作,最后对差值DC系数进行分块和阈值处理,判断是否有目标出现并报警。实验结果表明,该方法具有计算复杂度低,占用存储空间少和误报率低的特点,非常适合基于单片机的无线图像监控系统。

关键词：图像监控直流系数目标检测

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一种基于置换策略的离散多目标差分进化算法

武汉理工大学学报 2010年第16期32卷 1-5页

作者：耿焕同张明郑锐黄艳红南京信息工程大学计算机与软件学院南京210044 南京信息工程大学人工智能及其应用实验室南京210044

提出了一种基于置换策略的多目标差分进化算法,采用置换策略来实现优化空间由连续向离散的转换,并结合Pareto快速分层排序策略和基于聚集密度的按层修剪操作对种群进行更新维护,以保持解集的逼近性和分布性。以多目标0/1背包问题为例进... 详细信息

提出了一种基于置换策略的多目标差分进化算法,采用置换策略来实现优化空间由连续向离散的转换,并结合Pareto快速分层排序策略和基于聚集密度的按层修剪操作对种群进行更新维护,以保持解集的逼近性和分布性。以多目标0/1背包问题为例进行实验,结果表明该算法能有效求解离散型多目标优化问题,优于经典的NSGA-II算法。

关键词：多目标优化背包问题差分进化多目标背包问题

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A Self-adjusted Genetic Algorithm Based on VOD Cluster

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A Self-adjusted Genetic Algorithm Based on VOD Cluster