量子通信密码,斩断伸向电子支付魔掌的利剑——探索量子通信密码在电子支付中的应用

本文首先探讨电子支付在电子商务发展中的重要性,然后针对花样不断翻新、层出不穷的电商网络诈骗案例,着重解析其背后的驱动力;同时,分析电子商务当前所使用的电子支付系统存在的一些问题,结合我国发射的量子通信实验卫星,探索量子通信密码在电子商务发展中将要发挥的重要作用;最后指出实现我国电子支付的安全,实现全世界信息化和数字化,在于使用全球量子通信网络。     

跟踪及数据中继卫星系统的正反向通信链路

本文讨论跟踪及数据中继卫星系统的正反向通信链路。包括：１）Ｓ波段多址勤条链路的相控阵天线地面多波束形成自适应对准；２）把ＴＤＲＳ上的３０个单元天线的接收信号转回地面并保证各路之间相对相位，振幅的稳定；３）Ｋｕ波段单址勤务链路中ＴＤＲＳ与用户飞行器天线相互捕获与跟踪；４）扩频－测距码的快捕。     

宇宙通信和跟踪系统的频率稳定度要求

宇宙通信和跟踪系统对稳定的频率源提出了严格的要求。“闪烁”(1/f)噪声和环境变化是影响典型的宇宙系统性能的振荡器的两个不稳定因素。列出了几种系统的例子以及各个系统对频率源的要求。依据具体试验,地球卫星系统对稳定度的要求在数秒到数小时时间内为10~(-10)。典型系统要求S波段12赫带宽接收机内的相位噪声小于5°均方根值。以宇宙飞行器应答机为例,在10赫到10千赫,峰值为3g的振动下,其相位噪声应低于45°峰峰值。     

一种小尺寸极化阵列及其高精度定位波束形成

提出一种偶极子天线单元构成的极化敏感阵列用于全球卫星导航信号的接收,经过阵列信号波束形成后,在抗干扰的同时保留卫星导航信号中载波相位测量值的准确性,可用于基于载波相位测量的高精度差分定位。与传统的圆极化天线阵列相比,该阵列具有阵元构造简单、尺寸小的特点。通过建立极化阵列接收信号模型,分析了天线极化和波束形成算法对卫星导航信号相位的影响,给出了相适应的相位中心稳定的数字波束形成算法。仿真验证了分析的正确性和算法的有效性。     

量子通信将使军事通信更加保密

<正>量子领域的量子计算、量子通信、量子探测等技术持续突破,成为各国竞逐的前沿领域。特别是作为新一代通信技术,量子通信基于量子信息传输的高效和绝对安全性,成为近年来国际科研竞争中的焦点领域之一。一、量子通信:划时代的崭新技术进入21世纪,随着世界电子信息技术的迅猛发展,以微电子技术为基础的信息技术即将达到物理极限,以量子效应为基础的量子通信将成为引领未来科技发展的重要领域。量子通信(Quantum communication)是指利用量子纠     

基于量子遗传算法的航空通信频率动态分配

为了更加有效地对航空通信频率进行分配,提出了一种基于量子遗传算法的航空通信频率动态分配方法。通过对频率动态分配思路进行分析,建立了频率动态分配框架,给出了频率动态分配的具体流程。在此基础上,讨论了航空通信频率动态分配问题,定义了航空通信频率动态分配约束条件,建立了航空通信频率动态分配模型。最后,运用量子遗传算法和遗传算法对算例进行仿真对比。结果表明：量子遗传算法在种群适应度和收敛速度上具备明显的优越性,频率动态分配模型能够根据不同种群数量条件动态调整适应度,能够较好满足航空通信频率分配问题动态性、准确性、时效性等实践运用要求。     

一种应用于海上浮标的卫星中继通信终端

为了实现四级海况下海上小型浮标与岸基站数据中心之间的实时通信，设计和研制了一种高速率、低延时和高可靠的S频段卫星中继通信终端。该卫星中继通信终端由S频段中继通信机、抛物面天线、伺服跟踪机构、电源变换模块、温度控制器以及耐10 m水压的天线罩体等组成。终端为直径1 m的半球体，质量小于30 kg，最大峰值功耗小于等于130 W。卫星中继通信终端利用快速捕获跟踪卫星信号技术，能在7 s内迅速捕获和跟踪卫星前向链路信号；采用自适应海况可变码率技术提高了数据传输的可靠性。四级海况下，卫星中继通信终端实现了浮标与岸站之间最大2Mb/s高速率实时数据传输，大回路数据通信误码率小于等于10-5。     

量子通信安全性研究

随着量子通信的发展,安全问题引起了人们的极大关注。本文分析了量子通信安全的意义,并从密钥分发、量子加密和量子认证三个方面归纳了国内外量子通信安全问题的研究进展情况。最后,基于对量子通信安全存在的问题,指出了今后该领域的研究方向。     

一种高效的混合M元扩频通信方案

为进一步提高扩频通信系统的频带利用率和抗截获性能,将正交扩频技术与码相位循环移位调制技术相结合,提出了一种新的高效多进制扩频通信方案。在正交信道的每条支路上,首先采用M元双正交扩频调制,再以每一个扩频码为原型码进行码相位循环移位调制,选用专用的伪噪声码进行同步,在接收端用基于变换域处理的循环相关器进行解扩。计算机仿真表明,该方案易于实现同步,同时有较高的频带利用率和更强的抗截获性能。该方案在卫星隐蔽通信、数据链通信等领域有较大的应用价值。     

射频连接器振动对信号相位噪声的影响

振动环境作用于射频连接器会影响信号的相位噪声。为了提高通信质量,研究了振动对射频连接器相位噪声的影响。分析了振动条件下射频连接器对通过其中的高频信号产生相位噪声的基本原理,推导出了机械振动参数与其产生的相噪功率谱之间的数学关系,验证了振动对不同频率信号的影响关系,并在相应的试验中验证了推导结果的正确性。相关研究结果对分析射频连接器的工程应用中振动对信号的影响具有指导作用。     

Corporate communication management: A framework based on decision-making with reference to communication resources

This paper proposes a conceptual framework for corporate communication management, based on the creation and utilisation of communication resources. The aim is to address a gap in the literature in that to date, communication tools have been identified as communication resources in very few studies, nor have communication decisions been linked to the creation and use of such resources. The paper draws on some basic resource-based view assumptions to identify firm-specific communication resources. The study also draws on Parsons' sociological approach with reference to the classification of organisational decisions (policy, allocation and coordination) and contextualises this approach to the decision-making within corporate communication function/department. The framework also takes into account some elements of the postmodernism. According to this tendency in contemporary culture, internal and external stakeholders play a proactive role in the creation and utilisation of communication resources. The study contributes to the development of corporate communication as an autonomous area of management.     

一种高可靠性的保密野战通信系统方案

针对野战环境,特别是野战车辆对通信的需求,在总结以往通信系统设计经验的 基础上,根据现在通用的各种通信手段及未来可能大量运用的通信手段,提出了一套野战通 信系统方案。该系统方案在融合有线、无线、卫星、光纤等各种常规通信手段的基础上,增 加了具有组网灵活、保密性强等优点的激光通信手段,比以往常用的野战通信系统更具灵活 性、可靠性和保密性。分析表明,该通信系统可以适应许多野战通信的场合,有相当广泛的 实用价值。     

混沌在数字通信中的应用

我国高校的国际商务英语专业在经历了20多年的办学历程之后,今天面临着从理论的高度进行整顿、提高的任务。本文发出了“加强理论建设,把我国高校的国际商务英语专业发展成为在理论与实践的结合上更为成熟的独立学科”的呼吁,并阐述了作者对有关国际商务英语学科建设的几个重大问题的看法。     

The Effects of Multimedia Communication on Web-Based Negotiation

With the rapid growth of electronic commerce, there is growing demand forremote online negotiations. Although the Internet now enables audio and video communication, most Web-based negotiation systems are still text-based. There is, however, a lack of research on the effects of multimedia on remote negotiations. In this paper, we present a theoretical model to investigate the impacts of multimedia communication in an online negotiation setting. The constructs in our model include communication efficiency, communication effectiveness, and positive and negative social-emotional communication. Through a simulated house purchasing negotiation experiment, we study how different multimedia combinations (text only; text with audio; text with audio and video) affect our constructs and thus further influence negotiation results. Our results showed that both text with audio and text with audio and video communication were significantly preferred to text alone. However, the addition of video to text and audio communication in a negotiation environment was not found to be beneficial. It did not significantly improve communication efficiency, effectiveness or positive social-emotional communication, but distracted negotiators from focusing on the negotiation task. Our analysis also revealed that the communication efficiency construct did not correlate with the perceived success of the negotiation solution; however communication effectiveness and social-emotional communication did correlate with negotiation satisfaction.     

Avow or Avoid?

Abstract

Sixteen press releases from Enron and 16 releases from WorldCom representing the first three months of each organization's financial crises were gathered from the organization's web sites. The goal of this study was to determine whether the dominant public communication tactic of these companies was to avow or promote frankness, a traditional public relations stance, or to avoid or be evasive, a traditional legal stance. The releases were compared with 47 published accounts of the unfolding financial crises to determine whether the organizational messages remained intact. The findings show no dominant communication strategy in either company. Both professed openness but engaged in blame shifting. The combined message strategy suggests cooperation between legal and public relations counsel. The messages of both organizations were successfully transmitted via the mass media but were tempered by solid reporting. These findings suggest additional evidence that legal and public relations crisis communication strategies are starting to blur.     

美军机载射频与FSO混合通信发展述评

机载光与射频混合通信系统概念是美国防先期研究计划局（DARPA）提出的创新性概念，用以为机载平台提供定向高速宽带数据链，支持空基骨干网等宽带通信应用。目前该概念已经进行了概念验证以及多次演示和测试。概述了美军机载光与射频混合通信研究进展，分析了相关关键技术，指出了发展趋势，并给出了相关的启示和建议。     

The ‘Catch 22’ of communicating CSR: Findings from a Danish study

This research explored the apparent ‘Catch 22’ of communicating Corporate Social Responsibility (CSR). Although companies are regularly encouraged to engage in CSR, they are simultaneously discouraged to communicate about this engagement. We contribute with two models that may help to explain how companies can best communicate about their CSR initiatives. Based on a reputation survey and two case studies of Danish corporate CSR frontrunners, first we develop an ‘inside‐out approach’ to suggest how managers can manage their CSR activities to achieve favourable CSR reputation in a ‘Catch 22’ context. Employees appear as a key component in building trustworthiness as CSR communication is shown to evolve when taking an ‘inside‐out approach’. Second, we develop a CSR communication model with two CSR communication processes targeting different stakeholder groups: ‘the expert CSR communication process’ and ‘the endorsed CSR communication process’. Integrating these models and processes may help companies strategically capture reputational advantage from their CSR initiatives.     

整合营销传播(IMC)：概念及实践特征探析

整合营销传播是适应信息多元化与品牌中心时代的新型沟通体系。"整合营销传播"概念框架中的"整合"有质、量两方面不同的内涵,在整合目标上有品牌战术传播和组织整体战略传播两个高低不同的层次,整合营销传播实践的运行特征包括"接触管理"、"协同效应"、"双向沟通"等三项指标。     

Face-to-face communication: Is it really necessary in a digitizing world?

Many predictions regarding the extinction of face-to-face communication have themselves begun to disappear. While emerging information technologies are substantially altering the face of business communication, close-quarter discussion and debate remain important, as evidenced in the productivity of the medium and what we have recently learned about social behavior. Still, the possibility of dramatic change cannot be completely discounted. If technology ever manages to deliver what it has promised, there could be a significant shift toward digital communication. Although this will not likely occur over the next decade or two, beyond that, it should not be excluded from the realm of possibility.     

浅析品牌3.0时代的品牌传播特征

品牌传播理念的发展是跟品牌及形成品牌的时代的发展相辅相成的，造就品牌的环境是一个复杂、充满活力并不断变化的有机体系。在品牌3.0时代，品牌的传播出现新的特征，这既是环境使然，也是传播技术进步后的必然趋势，研究其特征，有利于品牌的成长。