An Active Deception Defense Model Based on Address Mutation and Fingerprint Camouflage

The static and predictable characteristics of cyber systems give attackers an asymmetric advantage in gathering useful information and launching attacks.To reverse this asymmetric advantage,a new defense idea,called Moving Target Defense(MTD),has been proposed to provide additional selectable measures to complement traditional defense.However,MTD is unable to defeat the sophisticated attacker with fingerprint tracking ability.To overcome this limitation,we go one step beyond and show that the combination of MTD and Deception-based Cyber Defense(DCD)can achieve higher performance than either of them.In particular,we first introduce and formalize a novel attacker model named Scan and Foothold Attack(SFA)based on cyber kill chain.Afterwards,we develop probabilistic models for SFA defenses to provide a deeper analysis of the theoretical effect under different defense strategies.These models quantify attack success probability and the probability that the attacker will be deceived under various conditions,such as the size of address space,and the number of hosts,attack analysis time.Finally,the experimental results show that the actual defense effect of each strategy almost perfectly follows its probabilistic model.Also,the defense strategy of combining address mutation and fingerprint camouflage can achieve a better defense effect than the single address mutation.

Interference in Complex CDMA-OFDM/OQAM for Better Performance at Low SNR

This article is about orthogonal frequency-division multiplexing with quadrature amplitude modulation combined with code division multiplexing access for complex data transmission. It aims to present a method which uses two interfering subsets in order to improve the performance of the transmission scheme. The idea is to spread in a coherent manner some data amongst two different codes belonging to the two different subsets involved in complex orthogonal frequency-division multiplexing with quadrature amplitude modulation and code division multiplexing access. This will improve the useful signal level at the receiving side and therefore improve the decoding process especially at low signal to noise ratio. However, this procedure implies some interference with other codes therefore creating a certain noise which is noticeable at high signal to noise ratio.

Distributed Application Addressing in 6G Network

To ensure the extreme performances of the new 6G services,applications will be deployed at deep edge,resulting in a serious challenge of distributed application addressing.This paper traces back the latest development of mobile network application addressing,analyzes two novel addressing methods in carrier network,and puts forward a 6G endogenous application addressing scheme by integrating some of their essence into the 6G network architecture,combining the new 6G capabilities of computing&network convergence,endogenous intelligence,and communication-sensing integration.This paper further illustrates how that the proposed method works in 6G networks and gives preliminary experimental verification.

解决CDMA同步问题的可见光定位算法

为克服时分复用技术中需要时钟同步和频分复用系统不够灵活的问题,提出了一种基于码分复用技术的高精度可见光定位算法。算法在异步场景下实现了码元同步和可见光定位的过程,仿真结果表明,在覆盖房间80%以上的区域时,算法的平均定位误差为6.9cm,最大定位误差为11cm,适用于绝大多数室内基于位置信息的服务。此外,分析了系统定位精度与接收机视场角及接收机离地高度的关系。发现在一定范围内,接收机视场角越大,系统的定位性能越差;接收机的离地高度越大,系统的定位性能越好。

Application Strategies of Automatic Addressable Single-Lamp Control Technology in Tunnel Lighting

The article mainly studies the application strategy of automatic addressable single-lamp control technology in tunnel lighting.It encompasses an introduction to this technology,an analysis of the tunnel lighting system using automatic addressable single-lamp control technology,and outlines the main development direction for this technology in modern tunnel lighting.The aim is to offer insights that can inform the rational deployment of this technology,thereby enhancing the lighting control effectiveness in modern tunnels and meeting their specific lighting requirements more effectively.

Two-Stage Address Coding in MFSK/FH-CDMA System

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Shared Cache Based on Content Addressable Memory in a Multi-Core Architecture

Modern shared-memory multi-core processors typically have shared Level 2(L2)or Level 3(L3)caches.Cache bottlenecks and replacement strategies are the main problems of such architectures,where multiple cores try to access the shared cache simultaneously.The main problem in improving memory performance is the shared cache architecture and cache replacement.This paper documents the implementation of a Dual-Port Content Addressable Memory(DPCAM)and a modified Near-Far Access Replacement Algorithm(NFRA),which was previously proposed as a shared L2 cache layer in a multi-core processor.Standard Performance Evaluation Corporation(SPEC)Central Processing Unit(CPU)2006 benchmark workloads are used to evaluate the benefit of the shared L2 cache layer.Results show improved performance of the multicore processor’s DPCAM and NFRA algorithms,corresponding to a higher number of concurrent accesses to shared memory.The new architecture significantly increases system throughput and records performance improvements of up to 8.7%on various types of SPEC 2006 benchmarks.The miss rate is also improved by about 13%,with some exceptions in the sphinx3 and bzip2 benchmarks.These results could open a new window for solving the long-standing problems with shared cache in multi-core processors.

IPv6地址驱动的云网络内生安全机制研究

云网络可以根据不同业务场景对云平台虚拟网络资源快速部署与配置,是现代数据中心性能和安全的重要保障。但传统云网架构中IPv4支撑能力有限,无法实现网络端到端的透明传输,多租户特性使得云管理者对租户子网进行流量管理和约束异常困难,外挂式的安全方案缺乏对不同租户流量的追溯能力,无法在源头对攻击行为进行限制。IPv6具有地址空间大、编址能力强、安全性高的特点,基于此,文章提出一种IPv6地址驱动的云网络内生安全机制,包括地址生成层、地址验证层和地址利用层。地址生成层以对称加密算法为基础,将租户身份信息嵌入IPv6地址后64位,修改DHCPv6地址分配策略,并基于Openstack Neutron进行实现。地址验证层设计实现了云网络动态源地址验证方法,针对不同端口状态集合设计针对性转移方法和安全策略。地址利用层基于IPv6真实地址的特性,实现了基于IPv6地址的数据包溯源机制和访问控制策略。

An Analysis of Chinese Address Terms From the Perspective of Speech Act Theory

Address terms are an important resource for conveying relationships.In daily interactions,the use of address terms is unavoidable.Therefore,the choose of address terms is particularly critical to make communicate smoothly with people.Previous scholars have studied address terms from a wide range of perspectives.But there is not much research on Chinese address terms based on speech act theory,which is put forward by John Langshaw Austin.By observing communicative conversations,several findings have been emerged from the analysis.They are professional title,affectionate address terms,and common address terms.These findings express the existential significance of address terms,which are the premise for people to maximize their illocutionary act when communicating.Correct understanding and grasp of the use of address terms is conductive to unfolding the communicative dialogue more smoothly.

Challenges and Countermeasures for Integrating the Protection of Environmental Rights into Actions for Addressing Climate Change

Climate change,which is the result of human activities,has wide-ranging impact.It poses a serious threat to human rights.Environmental rights are where the protection of the ecological environment and the development of human rights intersect.In view of the close relationship between the actions for addressing climate change and environmental rights,China should integrate the protection of environmental rights into the actions for addressing climate change,so as to achieve simultaneous development of both.In the process of coping with climate change,the right to climate stability that mainly pursues a“harmless”environment and the right to a more livable climate that pursues a“beautiful eco-environment”are specific manifestations of environmental rights and should be the priority of protection efforts.However,there are still some obstacles to achieving the coordinated development of the efforts to address climate change and the protection of environmental rights because traditional rights protection methods mainly give individuals subjective rights with the power to claim and are thus difficult to meet the needs of environmental rights protection in the context of climate change,and there are inherent value differences between responding to climate change and the realization of other human rights.Building a multi-level national obligation system to address climate change,giving full play to the role of courts in responding to climate change through moderate judicial activism,and coordinating the efforts to cope with climate change and the development of human rights under the guidance of a holistic system view are effective ways to overcome the aforementioned difficulties.

多径异步LSC-DS-CDMA信号伪码估计

针对多径环境下异步长短码直扩码分多址信号(long and short code direct sequence code division multiple access,LSC-DS-CDMA)伪码估计难的问题,提出一种基于张量分解和联合估计的伪码估计方法,采用重叠窗对接收信号进行分段并构建张量模型。为改善传统线性步长搜索算法结合梯度下降的方法分解因子矩阵收敛较慢的问题,提出改进的线性步长搜索算法,结合使用动量梯度下降法对各子张量进行Tucker分解得到各因子矩阵,所需的迭代次数大大减少;利用接收增益矩阵和移位相乘解决复合码的排序模糊和幅度模糊问题;利用最大似然准则联合估计复合码和多径信道后,使用梅西算法和相关运算估计每个用户的长码和短码。仿真结果表明,该方法能够有效估计多径异步LSC-DS-CDMA信号的伪码。

基于CDMA网络的时间校准系统方案设计

针对大型场所不同房间内时钟显示不统一的问题,本文设计了一种基于CDMA网络的时间校准系统方案,其具有成本低、精度高、无累计误差等特点,具有较强的实用价值。

解决CDMA同步问题的可见光定位算法

为克服时分复用技术中需要时钟同步和频分复用系统不够灵活的问题,提出了一种基于码分复用技术的高精度可见光定位算法。算法在异步场景下实现了码元同步和可见光定位的过程,仿真结果表明,在覆盖房间80%以上的区域时,算法的平均定位误差为6.9cm,最大定位误差为11cm,适用于绝大多数室内基于位置信息的服务。此外,分析了系统定位精度与接收机视场角及接收机离地高度的关系,在一定范围内,接收机视场角越大,系统的定位性能越差;接收机的离地高度越大,系统的定位性能越好。

工程教育背景下MATLAB在通信原理教学中应用

在工程教育专业认证的背景下,为有效开展通信原理课程的综合实践,提升教学效果,将MATLAB设计引入教学活动中。以工程教育理念为指导,改进传统实践教学不足。以CDMA设计为案列,介绍新思路下教学设计与实施过程,注重培养学生解决复杂工程问题能力,构建多方面综合教学考核评价体系,激励学习主观能动性。实验结果表明,该方法有效可行,满足工程教育专业认证人才培养需求。

基于过零点斜率加窗解调的ACARS信号接收方法

飞机通信寻址与报告系统(ACARS)允许飞机和地面站之间发送和接收报文,在保障飞行安全、实现空中交通管制等方面具有重要意义。通信链路的噪声和频偏是影响ACARS信号接收性能的关键因素。针对ACARS信号接收过程中的失真等问题,深入研究频偏、噪声等因素与ACARS报文接收性能之间的关系;在充分考虑噪声与多普勒频移等因素的基础上,提出基于过零点斜率加窗解调的ACARS信号接收方法,并从理论和仿真分析2方面探讨不同方法的抗频偏抗噪声能力;设计并搭建基于软件无线电平台的ACARS信号接收系统。通过对ACARS报文接收性能的仿真分析和真实报文接收性能的对比分析,表明所提方法在提升抗噪声和频偏能力、降低误码率等方面均具有优势。

论黄金分割思想在散文文体分析中的美学价值——以Gettysburg Address为例

与其他艺术形式一样,文学作品中也存在黄金分割。迄今为止,前人研究了黄金分割在诗歌、小说和戏剧三种文体结构中的体现,但未涉及散文。文章以林肯总统的Gettysburg Address为例,从段落、句子、词汇、音节、演讲时长五个层面来分析黄金分割在其中的体现,并就其在散文文体分析中的适用性展开讨论。研究发现:黄金分割是一种特殊的语言现象,适用于散文文体分析,具有独特的美学价值。

CDMA装配技术在制冷主机房机电安装中的运用

制冷机房是一种机电工程,涉及到大量的材料与设备。这些材料和设备安装在一起会给主机房的安装造成很多困难。本文分析了制冷主机房的结构特点,在此基础上提出了一种 CDMA 装配技术,这种方法不仅可以将电气与电子工程施工中大量用到的直平法,预埋法,套筒法等方法与 CDMA 技术结合起来,而且可以保证各专业施工不交叉、不矛盾。最后通过案例验证了该方法的可行性。

以人口高质量发展积极应对人口老龄化:内在逻辑与治理进路

人口老龄化是人口高质量发展的重要背景,人口高质量发展则为积极应对人口老龄化提供人口要素的支撑。结合人口高质量发展与积极应对人口老龄化国家战略的行动目标,在厘清二者辩证关系的基础上,需从激活老年群体价值潜力,完善终身教育体系,统筹“一老一小”服务,面向老龄社会需求优化人力资源分布等方面着手,找准共同进路,把握机遇挑战,在中国式现代化进程中不断夯实高质量的人口要素基础,积极应对人口老龄化。

习近平关于气候变化全球治理的重要论述及其启示

习近平以马克思主义人与自然关系思想为理论根基,从“和合共生”的中华智慧中汲取营养,立足中国应对气候变化的探索实践,围绕气候变化全球治理这一时代课题作出一系列重要论述。习近平明确了气候变化全球治理要坚持人与自然是辩证统一关系的科学认识,要协调人与人、人与自然的关系;主张坚持公平正义的价值取向,构建公平合理、合作共赢的全球气候治理体系;强调气候变化全球治理的大国担当,以中国在气候变化全球治理中的担当来促进应对气候变化的国际合作;提出绿色低碳可持续的发展道路,指明气候变化全球治理的实践方向。习近平关于气候变化全球治理的重要论述彰显了哲学思维和哲学智慧,其重要启示在于:新时代我们应该坚持以人为本维护全球气候正义;坚持共商共建共享的理念,推进全球气候治理秩序迈向公正合理;深入认识人与自然的辩证统一关系,创建人与自然和谐共生新格局,构建“人与自然生命共同体”引领全球生态文明建设。

基于PZT的8+8超声传感器阵列寻址接收策略及电路系统设计

超声传感器阵列寻址接收方法不同于传统的超声阵列接收机制,它可以灵活地选择阵列中接收阵元数量及分布范围,在简化电路规模的同时,可以实现阵列的变孔径接收。提出了一种基于PZT的8+8(64阵元)规模寻址激励超声阵列接收策略,设计了基于微处理器和PMOS电子开关控制的寻址接收电路,实际测试并分析了寻址接收模式下超声阵列的电气特性。采用单阵元、整行阵元、整列阵元及全部阵元接收孔径4种寻址接收模式,测试了铝和钢材试块底面回波信号,得到不同接收模式下回波信噪比的变化规律及特性。