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Proactive Caching at the Wireless Edge:A Novel Predictive User Popularity-Aware Approach

computer Modeling in Engineering & sciences 2024年第8期140卷 1997-2017页

作者： Yunye Wan Peng chen Yunni Xia Yong Ma Dongge Zhu Xu Wang Hui Liu Weiling Li Xianhua Niu Lei Xu Yumin Dong College of computer science Chongqing UniversityChongqing400044China school of computer and Software Engineering Xihua UniversityChengdu610039China school of computer and Information Engineering Jiangxi Normal UniversityNanchang330022China Electric Power Research Institute of State Grid Ningxia Electric Power Co. Ltd.Yinchuan750002China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing400030China school of computer science and Technology Beijing Institute of TechnologyBeijing100083China school of computer science and Technology Dongguan University of TechnologyDongguan523808China school of Emergency Management Xihua UniversityChengdu610039China College of computer and Information science Chongqing Normal UniversityChongqing401331China

Mobile Edge Computing(MEC)is a promising technology that provides on-demand computing and efficient storage services as close to end users as *** an MEC environment,servers are deployed closer to mobile terminals to exploit storage infrastructure,improve content delivery efficiency,and enhance user ***,due to the limited capacity of edge servers,it remains a significant challenge to meet the changing,time-varying,and customized needs for highly diversified content of ***,techniques for caching content at the edge are becoming popular for addressing the above *** is capable of filling the communication gap between the users and content providers while relieving pressure on remote cloud ***,existing static caching strategies are still inefficient in handling the dynamics of the time-varying popularity of content and meeting users’demands for highly diversified entity *** address this challenge,we introduce a novel method for content caching over MEC,i.e.,*** synthesizes a content popularity prediction model,which takes users’stay time and their request traces as inputs,and a deep reinforcement learning model for yielding dynamic caching *** results demonstrate that PRIME,when tested upon the MovieLens 1M dataset for user request patterns and the Shanghai Telecom dataset for user mobility,outperforms its peers in terms of cache hit rates,transmission latency,and system cost.

关键词： Mobile edge computing content caching system average cost deep reinforcement learning collaborative mechanism

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Non-Hermitian polarization quantized by time-reversal symmetry

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science china(Physics,Mechanics & Astronomy) 2024年

作者： Jing cheng Jinbing Hu Zhigao Hu Lin chen Minghui Lu Songlin Zhuang Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai) Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education)Department of Physics and Electronic Science East of China Normal University College of Optical-Electrical Information and computer Engineering University of Shanghai for Science and Technology Wuhan National Laboratory for Optoelectronics and school of Optical and Electronic Information Huazhong University of Science and Technology National Laboratory of Solid State Microstructures science and Engineering Nanjing University

It is well known that in one-dimensional(1D) crystalline insulators, the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS) as in Hermitian physics TRS does not induce any topological phase in one dimension. In this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk polarization. The underlying physical reason is unveiled: TRS guarantees the complex energies to come in pair(E, E*), and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate, hence, giving rise to a stable wannier center. The electron transport is performed by means of charge pumping process, which verifies the physical mechanism above. At last, we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.

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基于查询编译的SQL执行技术研究进展

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计算机研究与发展 2024年第7期61卷 1754-1770页

作者：潘青峰徐辰华东师范大学数据科学与工程学院上海200062 上海市大数据管理系统工程研究中心(华东师范大学) 上海200062

信息系统通常会借助数据管理系统来进行数据管理,其中SQL凭借良好的易用性和灵活性一直作为数据管理的主流查询语言,用户将编写的SQL语句交由数据管理系统执行后便可得到查询结果.执行模型的高效与否决定了系统能否快速响应用户的查询请... 详细信息

信息系统通常会借助数据管理系统来进行数据管理,其中SQL凭借良好的易用性和灵活性一直作为数据管理的主流查询语言,用户将编写的SQL语句交由数据管理系统执行后便可得到查询结果.执行模型的高效与否决定了系统能否快速响应用户的查询请求,现有执行模型主要采用解释执行和编译执行2种方式.解释执行具有良好的拓展性、可维护性等因而被大多数系统采用.不同于解释执行,编译执行为原本需要解释执行的查询生成高效的定制化代码来加速查询,带来的显著性能提升吸引了一众数据管理系统开始实现相应技术.然而,如何针对查询生成其对应的定制化代码是一个复杂的过程,在实现时需要考虑诸多方面,甚至在某些情况下,采用编译执行的查询性能可能还不及传统的火山模型.从概念、技术等角度系统地综述了编译执行技术的研究进展.首先,概述了编译执行的基本概念,对相关术语和背景知识进行了介绍;其次,分别从中间代码生成、中间表示、机器码生成与运行3个角度介绍了相关技术;最后,结合当前数据管理系统的研究趋势以及近期研究工作展望了编译执行未来的发展方向.

关键词：数据管理系统查询执行代码生成编译器即时编译

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非负张量分解的不平衡乘性更新

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数学研究 2011年第2期44卷 200-205页

作者：陈震王炫盛卢琳璋厦门大学数学科学学院贵州师范大学数学与计算机科学学院

针对非负张量分解的乘性更新算法,讨论了其元素形式与矩阵形式的一致性,并给出了不平衡的乘性更新算法.数值试验表明,新的算法具有更快的收敛性.

关键词：非负矩阵分解非负张量分解乘性更新不平衡迭代交替最小二乘

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A Decoupling Control Method of Ceramic Roller Kiln Temperature Based on Thermal Balance

A Decoupling Control Method of Ceramic Roller Kiln Temperatu...

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2010 The 3rd International Conference on Computational Intelligence and Industrial Application (PACIIA2010)

作者： chen Jing Luo Aijun Yuan Youxin school of Automation Wuhan university of Technology Wuhan Hubei 430070 china Xiao Chun Wu Xue Liu Mingyang school of Automation Wuhan university of Technology Wuhan Hubei 430070 china

According to the characteristics of ceramic roller kiln temperature process and the implementation scheme of temperature control,we proposed a new control method of the ceramic roller kiln temperature based on thermal *** set the difference between the real temperature and the set-point temperature of the ceramic roller kiln as a feedback signal for each control *** the decoupling model was established;then we calculated the coupling coefficients of temperature between the adjacent burners with thermal balance principle;finally the temperature coupling coefficients were employed to decoupling compensate for the outputs of the corresponding PID controllers of each burner *** results show that the temperature coupling coefficients can eliminate the temperature coupling between the adjacent burners,and the method can achieve a satisfactory control of the internal kiln temperature process.

关键词： Ceramic roller kiln Temperature control Thermal balance Decoupling

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Interpretable foundation models as decryptors peering into the Earth system

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The Innovation 2024年第5期5卷 21-22页

作者： chenyu Li Danfeng Hong Bing Zhang Tianjun Liao Naoto Yokoya Pedram Ghamisi Min chen Lizhe Wang Jon Atli Benediktsson Jocelyn Chanussot Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China school of Electronic Electricaland Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Academy of Military sciences Beijing 100000China Graduate school of Frontier sciences The University of TokyoChiba 277-8561Japan Helmholtz-Zentrum Dresden-Rossendorf Helmholtz Institute Freiberg for Resource Technology09599 FreibergGermany Key Laboratory of Virtual Geographic Environment(Ministry of Education of PRC) Nanjing Normal UniversityNanjing 210023China school of computer science China University of GeosciencesWuhan 430078China Faculty of Electrical and computer Engineering University of Iceland102 ReykjavikIceland university Grenoble Alpes InriaCNRSGrenoble INPLJK38000 GrenobleFrance

THE EARTH SYSTEM AMID THE BIG DATA *** processes of the Earth system drive interactions between energy,matter,and life,and a comprehensive understanding of their full evolutionary trajectory is critical for sustainable human *** modeling primarily relies on a set of theoretical equations to simulate dynamic process such as the carbon-nitrogen cycle,solar radiation dynamics,and terrestrial ecosystem dynamics.1 Despite the extensive modeling experience of Earth scientists,the rapid advancement of Earth observation techniques has led to a significant increase in the volume of databases,with data accumulating daily or even *** has exacerbated the conflict between the capacity for data collection and utilization for big Earth ***,there is an urgent need to enhance the intelligent processing and analysis of big Earth data.

关键词： dynamics. system foundation

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A Reference Vector-Assisted Many-Objective Optimization Algorithm with Adaptive Niche Dominance Relation

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Intelligent Automation & Soft Computing 2024年第2期39卷 189-211页

作者： Fangzhen Ge Yating Wu Debao chen Longfeng Shen school of computer science and Technology Huaibei Normal UniversityHuaibei340604China school of Physic and Electronic Information Huaibei Normal UniversityHuaibei340604China Anhui Engineering Research Center for Intelligent Computing and Application on Cognitive Behavior(ICACB) Huaibei Normal UniversityHuaibei340604China Anhui Province Key Laboratory of Intelligent Computing and Applications Huaibei Normal UniversityHuaibei340604China Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefei230000China

It is still a huge challenge for traditional Pareto-dominatedmany-objective optimization algorithms to solve manyobjective optimization problems because these algorithms hardly maintain the balance between convergence and diversity and can only find a group of solutions focused on a small area on the Pareto front,resulting in poor performance of those *** this reason,we propose a reference vector-assisted algorithmwith an adaptive niche dominance relation,for short *** new dominance relation forms a niche based on the angle between candidate *** comparing these solutions,the solutionwith the best convergence is found to be the non-dominated solution to improve the selection *** reproduction,a mutation strategy of k-bit crossover and hybrid mutation is used to generate high-quality *** 23 test problems with up to 15-objective,we compared the proposed algorithm with five state-of-the-art *** experimental results verified that the proposed algorithm is competitive.

关键词： Many-objective optimization evolutionary algorithm Pareto dominance reference vector adaptive niche

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视角对高频汉字识别的影响

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心理科学 2004年第4期27卷 770-773页

作者：黄希庭蔡治陈丽君西南师范大学心理学院重庆400715 广东技术师范学院教务处广州510665

用EyeLinkII型眼动仪为实验设备 ,以汉字与双眼形成的视角为自变量 ,研究了视角对高频汉字识别的影响特点。本实验中的视角分为 7个水平 :2°、4°、7°、1 0°、1 3°、1 6°、1 9° ,通过自编程序 ,计算出固定距离条件中不同视角下汉... 详细信息

用EyeLinkII型眼动仪为实验设备 ,以汉字与双眼形成的视角为自变量 ,研究了视角对高频汉字识别的影响特点。本实验中的视角分为 7个水平 :2°、4°、7°、1 0°、1 3°、1 6°、1 9° ,通过自编程序 ,计算出固定距离条件中不同视角下汉字的大小 ,呈现在计算机屏幕上 ,要求被试发声识别汉字。通过对反应时、注视时间、注视次数、眼跳时间、眼跳次数、眨眼时间、眨眼次数的分析。结果发现 :不同视角条件下的反应时总体差异不显著 ,反应时随视角的变化曲线为抛物线 ,开口向上 ;汉字识别的最适宜视角为 1 0°～ 1 1°。

关键词：汉字识别视角视觉图象心理感知

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Distinct immune escape and microenvironment between RG-like and pri-OPC-like glioma revealed by single-cell RNA-seq analysis

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Frontiers of Medicine 2024年第1期18卷 147-168页

作者： Weiwei Xian Mohammad Asad Shuai Wu Zhixin Bai Fengjiao Li Junfeng Lu Gaoyu Zu Erin Brintnell Hong chen Ying Mao Guomin Zhou Bo Liao Jinsong Wu Edwin Wang Linya You Department of Human Anatomy&Histoembryology School of Basic Medical SciencesFudan UniversityShanghai200032China Cumming school of Medicine University of CalgaryCalgaryAlbertaT2N 4N1Canada Glioma Surgery Division Department of NeurosurgeryHuashan HospitalFudan UniversityShanghai200040China Department of Pathology Huashan HospitalFudan UniversityShanghai200040China Department of Neurosurgery Huashan HospitalFudan UniversityShanghai200040China Shanghai Key Laboratory of Medical Imaging Computing and computer Assisted Intervention Fudan UniversityShanghai200040China school of mathematics and Statistics Hainan Normal UniversityHaikou570100China

The association of neurogenesis and gliogenesis with glioma remains *** conducting single-cell RNA-seq analyses on 26 gliomas,we reported their classification into primitive oligodendrocyte precursor cell(pri-OPC)-like and radial glia(RG)-like tumors and validated it in a public cohort and TCGA *** RG-like tumors exhibited wild-type isocitrate dehydrogenase and tended to carry EGFR mutations,and the pri-OPC-like ones were prone to carrying TP53 *** subclones only in pri-OPC-like tumors showed substantially down-regulated MHC-I genes,suggesting their distinct immune evasion ***,the two subgroups appeared to extensively modulate glioma-infiltrating lymphocytes in distinct *** specific genes not expressed in normal immune cells were found in glioma-infiltrating *** example,glial/glioma stem cell markers OLIG1/PTPRZ1 and B cell-specific receptors IGLC2/IGKC were expressed in pri-OPC-like and RG-like glioma-infiltrating lymphocytes,*** expression was positively correlated with those of immune checkpoint genes(e.g.,LGALS33)and poor survivals as validated by the increased expression of LGALS3 upon IGKC overexpression in Jurkat *** finding indicated a potential inhibitory role in tumor-infiltrating lymphocytes and could provide a new way of cancer immune evasion.

关键词： single-cell RNA-seq glioma radial glia primitive oligodendrocyte precursor cell immune escape

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Low-rank matrix recovery with total generalized variation for defending adversarial examples

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Frontiers of Information Technology & Electronic Engineering 2024年第3期25卷 432-445页

作者： Wen LI Hengyou WANG Lianzhi HUO Qiang HE Linlin chen Zhiquan HE Wing W.Y.Ng school of science Beijing University of Civil Engineering and ArchitectureBeijing 100044China school of computer science and Engineering South China University of TechnologyGuangzhou 510006China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Guangdong Key Laboratory of Intelligent Information Processing Shenzhen 518060China Institute of Big Data Modeling and Technology Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Low-rank matrix decomposition with first-order total variation(TV)regularization exhibits excellent performance in exploration of image *** advantage of its excellent performance in image denoising,we apply it to improve the robustness of deep neural ***,although TV regularization can improve the robustness of the model,it reduces the accuracy of normal samples due to its *** our work,we develop a new low-rank matrix recovery model,called LRTGV,which incorporates total generalized variation(TGV)regularization into the reweighted low-rank matrix recovery *** the proposed model,TGV is used to better reconstruct texture information without *** reweighted nuclear norm and Li-norm can enhance the global structure ***,the proposed LRTGV can destroy the structure of adversarial noise while re-enhancing the global structure and local texture of the *** solve the challenging optimal model issue,we propose an algorithm based on the alternating direction method of *** results show that the proposed algorithm has a certain defense capability against black-box attacks,and outperforms state-of-the-art low-rank matrix recovery methods in image restoration.

关键词： Total generalized variation Low-rank matrix Alternating direction method of multipliers Adversarial example

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