机载短波通信技术研究

本文介绍了机载短波通信系统,它的成功研制为机载短波通信系统的工程化打下了坚实的技术基础。     

应急多方话务通信方案设计

针对突发地质灾难中无法利用常规通信网络通信的问题,提出一种基于于嵌入式微处 理器OMAP5912 的实时多用户通信方案。采用WiFi无线网卡组建Ad Hoc网络,通过AIC23芯 片实现语音采集和输出,利用动态多用户语音解码算法实现实时多用户话音通话功能。测试 表明,该系统支持多用户同时语音通信功能,语音延迟约60 ms,适合于各种应急通信 等无线应用场合。     

机载短波单边带实时选频

本文对短波单边带实时选频的各种方案作了较为详细的论证,比较了各种方案的优缺点,指出了机载短波单边带实时选频实现的可行性和难点,提出了自动扫描实时通信系统,是解决机载短波通信较为简单而又切实可行的一种方法。     

短波选频和选址呼叫技术的研究与实践

本文从短波模拟话音通信的实际情况出发,讨论了短波无中心组网中,实时选频和数字选址技术.提出了以绝对值信噪比(ASNR)代替常用信噪比进行信道评判的实时选频方案,和以双门限连续判决器及简易纠错码-(7,4)循环码的软件编译码,作为数字选址呼叫信可靠传输、识别手段的数字选址呼叫方案,并通过了实验验证.     

基于公网的人民防空应急警报通信系统及应急通信保障工作策略研究

本文对人民防空应急警报通信系统进行通信所基于的公网网络进行比对分析,并设计了一套基于公网的人民防空应急警报通信系统,针对硬件设计优化了软件流程,并提出了利用基于公网的人民防空应急警报通信系统,做好人防应急通信保障工作的方案和实施策略.在人民防空工作领域,具有理论联系实际,技术服务社会的重要现实意义.     

非正弦短波通信方案及性能分析

为了提高短波通信容量和数据传输速率,缓减短波信道拥挤状况,提出了基于椭圆 球面波的非正弦短波通信方案。该方案利用快速设计方法设计椭圆球面波脉冲信号,利用新 方法构建椭圆球面波时域正交脉冲集,利用基于椭圆球面波的非正弦调制方法调制发送数据 ,利用基于椭圆球面波的非正弦相关解调方法解调发送数据。对基于椭圆球面波的非正弦调 制解调原理进行了推导和分析,对基于椭圆球面波的非正弦调制方法频带利用率和峰均功率 比性能进行了理论分析和仿真。在Watterson短波信道模型的基础上,仿真了基于椭圆球面 波的非正弦相关解调误码率性能。理论分析和仿真结果表明,基于椭圆球面波的非正 弦短波通信方案频带利用率高,可快速接近2 bit/s·Hz-1的理论极限值,频带利用 率、峰均功率比和误码率性能均优于OFDM技术。     

短波信道下的信号调制方式识别

针对短波信道条件下的通信信号调制识别问题,提取了以信号功率谱的各种特征为主要特征参数,使用判决树分类器,对基于Watterson信道模型下的九类常用短波信号进行调制识别.仿真结果表明,所选取的特征参数具有很好的稳健性,在中等短波信道且在低信噪比条件下有较高的正确识别率,且方法简单便于工程实现.     

从汶川地震通信问题谈平流层应急通信的应用

汶川地震暴露了我国应急通信系统不能满足突发事件通信需求,必须研究新型应急通信技术以克服当前应急通信存在的问题.提出了一种应用平流层通信技术实现应急通信系统的方法:在由飞艇组成的高空航空平台上装载基于微波技术的应急指挥通信系统和蜂窝移动基站,应急指挥通信系统用于突发事件的指挥通信,蜂窝移动通信用于公众通信.分析表明,平流层应急通信系统符合应急通信需求,具有部署快、成本低、容量大等特点.     

大区域网络化应急短波通信中的频率管理方法

频率选择问题一直是制约短波通信效能提升的瓶颈问题,网络化短波通信对优质频 率选择的适用性和时效性提出了更高的要求。针对大区域网络化短波通信的频率管理和使用 需求,提出融合利用损耗模型、Chirp探测数据、Modem探测数据进行区域覆盖计算的方法, 并基于计算结果实现对区域中心站导频和业务频率的指配和动态调整功能,实现了优质频率 统管共用目的,提升了大区域网络化应急短波通信的质量和效能。     

山区短波和超短波应急指挥通信系统

通过分析汶川地震通信受损情况、山区通信抢修过程以及抗震救 灾山区指挥通信状况,阐述了建立山区应急指挥通信系统的重要性以及山区指挥通信应具 备的特征,提出了一种基于短波和超短波数字集群通信技术的山区应急指挥通信系统构建模 式：省与县之间建设短波通信电台,县与乡以及村之间建设超短波数字集群通信系统,乡到 村之间建设无线广播系统。该系统具有使用维护成本低、通信内容保密性好、应对灾情险情 能力强等特点。     

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.     

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.     

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。     

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。