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Improving Expectation Propagation with Lattice Reduction for Massive MIMO Detection

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China Communications 2018年第12期15卷 49-54页

作者： senjie zhang Shi Jin Chao-Kai Wen Zhiqiang He Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications National Mobile Communications Research Laboratory Southeast University Institute of Communications Engineering Sun Yat-sen University

Efficient massive MIMO detection for practical deployment, which is with spatially correlated channel and high-order modulation, is a challenging topic for the fifth generation mobile communication(5 G). In this paper, we propose a lattice reduction aided expectation propagation(LRA-EP) algorithm for massive MIMO detection. LRA-EP applies expectation propagation in lattice reduced MIMO system to approach the distribution of lattice reduced constellation point by iterative refinement on its parameters(mean and covariance). The parameter refinement is based on the lattice reduced, well-conditioned MIMO channel. Numerical result shows that LRA-EP outperforms classic EP based MIMO detection(EPD) with 5～7 dB in terms of required signalto-noise ratio(SNR) for 1% packet error rate in spatially correlated channel for 256-QAM. We also show that LRA-EP has lower computation complexity than EPD.

关键词： MIMO detection lattice reduction expectation propagation massive MIMO

Ergodic Rate Analysis on Applying Antenna Selection in D2D Communication Underlaying Cellular Networks

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China Communications 2017年第11期14卷 167-184页

作者： senjie zhang Yuyang Wang Zhiqiang He Shi Jin Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications Beijing 100876 China The University of Texas at Austin USA National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

By reusing the spectrum of a cellular network, device-to-device(D2D) communications is known to greatly improve the spectral efficiency bypassing the base station(BS) of the cellular network. Antenna selection is the most cost efficient scheme for interference management, which is crucial to D2D systems. This paper investigates the achievable rate performance of the D2D communication underlaying the cellular network where a multiple-antenna base station with antenna selection scheme is deployed. We derive an exact closed-form expression of the ergodic achievable rate. Also, using Jensen's inequality, two pairs of upper and lower bounds of the rate are derived and we validate the tightness of the two sets of bounds. Based on the bounds obtained, we analyze the ergodic achievable rate in noise-limited scenario, interference-limited high SNR scenario and larger-scale antenna systems. Our analysis shows that the presence of D2D users could be counter-productive if the SNR at cellular UE is high. Further analysis shows that the relationship between the ergodic rate and the number of antennas it positive, but keeps decreasing as the antenna number increasing. These show the inefficiency of antenna selection in D2D interference management.

关键词： antenna selection D2D communication ergodic achievable rate Jensen’s inequality massive MIMO

Identification of Important FPGA Modules Based on Complex Network

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Computers, Materials & Continua 2024年第1期78卷 1027-1047页

作者： senjie zhang Jinbo Wang Shan Zhou Jingpei Wang Zhenyong zhang Ruixue Wang School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing101408China Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing100094China College of Control Science and Engineering Zhejiang UniversityHangzhou310063China College of Computer Science and Technology Guizhou UniversityGuiyang550025China

The globalization of hardware designs and supply chains,as well as the integration of third-party intellectual property(IP)cores,has led to an increased focus from malicious attackers on computing ***,existing defense or detection approaches often require additional circuitry to perform security verification,and are thus constrained by time and resource *** the scale of actual engineering tasks and tight project schedules,it is usually difficult to implement designs for all modules in field programmable gate array(FPGA)*** studies have pointed out that the failure of key modules tends to cause greater damage to the ***,under limited conditions,priority protection designs need to be made on key modules to improve protection *** have conducted research on FPGA designs including single FPGA systems and multi-FPGA systems,to identify key modules in FPGA *** the single FPGA designs,considering the topological structure,network characteristics,and directionality of FPGA designs,we propose a node importance evaluationmethod based on the technique for order preference by similarity to an ideal solution(TOPSIS)***,for the multi-FPGA designs,considering the influence of nodes in intra-layer and inter-layers,they are constructed into the interdependent network,and we propose a method based on connection strength to identify the important ***,we conduct empirical research using actual FPGA designs as *** results indicate that compared to other traditional indexes,node importance indexes proposed for different designs can better characterize the importance of nodes.

关键词： Hardware security FPGA circuits node importance interdependent network

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基于高精度室内位置感知的大数据研究与应用

计算机应用 2016年第2期36卷 295-300页

作者：邓中亮张森杰焦继超徐连明北京邮电大学电子工程学院北京100876

随着室内定位技术的发展,室内位置数据和用户消费行为数据的大量产生为室内位置大数据(LBD)研究和应用提供了可能。基于高精度室内位置感知,突破了室内定位位置数据不准确的瓶颈。通过对室内位置数据聚类、降维等预处理,建立挖掘模型分... 详细信息

随着室内定位技术的发展,室内位置数据和用户消费行为数据的大量产生为室内位置大数据(LBD)研究和应用提供了可能。基于高精度室内位置感知,突破了室内定位位置数据不准确的瓶颈。通过对室内位置数据聚类、降维等预处理,建立挖掘模型分析并提取了室内商圈区域的聚散和流动等特性,进一步通过特征关联预测用户的消费等行为,提出了室内位置大数据协同挖掘的方法和架构。在某机场商圈、西单某商场亿级用户位置数据集上进行了有效性实验和应用,通过实测数据对比验证了基于此架构室内定位数据的精准性和挖掘方法的可行性。

关键词：位置大数据室内高精定位特征挖掘时空关联 O2O商业模型

A Rhizobium bacterium and its population dynamics under different culture conditions of its associated toxic dinoflagellate Gambierdiscus balechii

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Marine Life Science & Technology 2021年第4期3卷 542-551页

作者： Zhen Wu Xiaohong Yang senjie Lin Wai Hin Lee Paul K.S.Lam State Key Laboratory of Marine Pollution City University of Hong KongHong KongChina Department of Chemistry City University of Hong KongHong KongChina State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China Department of Marine Sciences University of ConnecticutGrotonCT 06340USA Department of Biomedical Sciences City University of Hong KongHong KongChina Shenzhen Key Laboratory for the Sustainable Use of Marine Biodiversity Research Centre for the Oceans and Human HealthCity University of Hong Kong Shenzhen Research InstituteShenzhen 518057China

Rhizobium bacteria are known as symbionts of legumes for developing nodules on plant roots and fixing N2 for the host plants but unknown for associations with ***,we detected,isolated,and characterized a Rhizobium species from the marine toxic dinoflagellate Gambierdiscus *** 16S rRNA gene(rDNA)is 99%identical to that of Rhizobium rosettiformans,and the affiliation is supported by the phylogenetic placement of its cell wall hydrolase-encoding gene(cwh).Using quantitative PCR of 16S rDNA and cwh,we found that the abundance of this bacterium increased during the late exponential growth phase of Gambierdiscus and under nitrogen limitation,suggesting potential physiological interactions between the dinoflagellate and the *** is the first report of dinoflagellate-associated Rhizobium bacterium,and its prevalence and ecological roles in dinoflagellate-Rhizobium relationships remain to be investigated in the future.

关键词： Rhizobium Gambierdiscus 16S rRNA gene Cell wall hydrola Edited by Chengchao Chen

教育、建设与动员:延安时期党刊的马克思主义传播功能

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出版发行研究 2023年第2期 96-103页

作者：田森杰张晓红中国传媒大学新闻学院中国传媒大学党报党刊研究中心

延安时期,以《解放》《群众》《共产党人》为代表的党刊展开了丰富的马克思主义传播实践,发挥了马克思主义教育功能、意识形态领导权建设功能以及团结抗战动员功能。教育功能的凸显源自于中国共产党内部的“思想焦虑”,党刊主要从认识... 详细信息

延安时期,以《解放》《群众》《共产党人》为代表的党刊展开了丰富的马克思主义传播实践,发挥了马克思主义教育功能、意识形态领导权建设功能以及团结抗战动员功能。教育功能的凸显源自于中国共产党内部的“思想焦虑”,党刊主要从认识论和方法论两个方面进行了马克思主义教育内容的生产,为保障该功能的发挥,中国共产党通过建制化的手段将党刊嵌入到党内教育之中。在建设功能上,党刊通过塑造出仪式空间与交往空间来增进马克思主义的认同,同时也为有机知识分子与大众之间提供了特定的结合空间。在动员功能上,党刊通过构建利益共同体的修辞策略满足了推动阶级联合和消解意识形态对立的修辞需求。党刊在发挥马克思主义传播功能的过程中,彰显出群体生产与群体阅读两种不同的群众路线实践取向。

关键词：党刊马克思主义传播功能群众路线

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基于安全策略的负载感知动态调度机制

计算机应用 2017年第11期37卷 3304-3310页

作者：顾泽宇张兴明林森杰国家数字交换系统工程技术研究中心郑州450002

针对软件定义网络(SDN)网络控制器流规则篡改攻击等单点脆弱性威胁,传统安全解决方案如备份、容错机制等存在被动防御缺陷,无法从根本上解决控制层安全问题。结合目前移动目标防御、网络空间拟态防御等主动防御技术研究现状,提出一种基... 详细信息

针对软件定义网络(SDN)网络控制器流规则篡改攻击等单点脆弱性威胁,传统安全解决方案如备份、容错机制等存在被动防御缺陷,无法从根本上解决控制层安全问题。结合目前移动目标防御、网络空间拟态防御等主动防御技术研究现状,提出一种基于异构冗余结构的动态安全调度机制。建立控制器执行体与调度体调度模型,根据系统攻击异常、异构度等指标,以安全性为原则设计动态调度策略;同时考虑系统负载因素,通过设计调度算法LASSA将调度问题转化为动态双目标优化问题,以实现优化的调度方案。仿真结果表明,对比静态结构,动态调度机制在累积异常值、输出安全率等指标上有明显优势,说明安全调度机制中的动态性与多样性能够显著提高系统抵御攻击能力,LA-SSA机制负载方差较安全优先调度更平稳,在实现安全调度的同时避免了负载失衡问题,验证了安全调度机制的有效性。

关键词：单点脆弱性主动防御技术动态调度机制安全策略负载感知

基于拟态防御理论的SDN控制层安全机制研究

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计算机应用研究 2018年第7期35卷 2148-2152页

作者：顾泽宇张兴明林森杰国家数字交换系统工程技术研究中心郑州450002

针对现阶段软件定义网络(SDN)控制层流规则窜改攻击以及单点脆弱性问题,提出一种基于动态异构冗余的拟态安全控制器模型,通过分布式冗余架构以及一致性判决机制提高系统可靠性,利用调度机制实现系统动态性以及结合异构因素提高系统安全... 详细信息

针对现阶段软件定义网络(SDN)控制层流规则窜改攻击以及单点脆弱性问题,提出一种基于动态异构冗余的拟态安全控制器模型,通过分布式冗余架构以及一致性判决机制提高系统可靠性,利用调度机制实现系统动态性以及结合异构因素提高系统安全性,通过一致性容错算法(consistency and fault detection algorithm,CFDA)实现安全数据处理与错误检测,并提高控制器集群动态、可扩展性。仿真结果表明,对于控制器集群网络而言CFDA具有较低的通信复杂度,降低了节点冗余度要求;同时,冗余体的增加可以非线性降低系统被攻击成功概率,而适当的调度策略大大提高了系统安全率,因此拟态安全控制器机制能够有效提高攻击者攻击难度,增加系统安全可靠性。

关键词： SDN控制层流规则窜改单点脆弱性动态异构冗余调度机制一致性与错误检测

快速升温后极地甲藻Polarella glacialis的生理响应

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极地研究 2013年第1期25卷 61-70页

作者：郑淑娴何剑锋王桂忠林森杰张芳厦门大学海洋与地球学院福建厦门361005 国家海洋局极地科学重点实验室中国极地研究中心上海200136

Polarella glacialis最早发现于南极固定冰和北冰洋水层,最近在温带海域也发现其相关基因。专抗甲藻的Rubisco(Ribulose bisphosphate carboxylase oxygenase,核酮糖-1,5-二磷酸羧化酶/加氧酶,光合作用C3碳反应中重要的羧化酶、光呼吸... 详细信息

Polarella glacialis最早发现于南极固定冰和北冰洋水层,最近在温带海域也发现其相关基因。专抗甲藻的Rubisco(Ribulose bisphosphate carboxylase oxygenase,核酮糖-1,5-二磷酸羧化酶/加氧酶,光合作用C3碳反应中重要的羧化酶、光呼吸中的加氧酶)、PCNA(Proliferating cell nuclear antigen,增殖细胞核抗原)抗体在该藻细胞内各检测到～53 kDa和～55 kDa的特异性条带。对该藻的梯度温度培养实验显示,4℃生长的***细胞密度为1.1×***-1时仍能继续增殖,一天中藻细胞内Rubisco的表达量基本保持恒定,PCNA的表达量峰值与%S(藻株中处于S期的细胞占所有细胞的百分比)峰值相对应,当温度迅速上升至15、20℃时,藻株处于胁迫状态,细胞密度迅速减少,正常的细胞周期被干扰,大多数细胞分裂活动不活跃或停止分裂,Rubisco、PCNA的表达量大幅减少甚至消失,昼夜表达特征改变,其中20℃对藻株的胁迫作用更加显著。15℃培养下的***细胞密度并不立即减少,细胞周期与两种指示蛋白表达特征显示仍有部分细胞完成分裂。本研究为该藻的相关基因在温带水域的出现提供了可能的解释,并推测在相对长期渐进的极地增温过程中,***可能继续存在。

关键词： Polarella glacialis细胞周期Rubisco PCNA