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IP over DVB中RTP视频的分析与提取 总被引:1,自引:1,他引:0
讨论了IP over DVB中RTP的视频数据的传输方式,主要是使用多协议封装(MPE),以及IP/UDP/RTP方式进行传输,最后给出了视频数据分析与提取的方法和流程. 相似文献
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介绍一种利用数字视频广播(DVB)/MPEG-2技术与TCP、UDP/IP协议紧密结合的卫星宽带接入系统,分析了该接入系统传输的宽带多媒体信号数据格式,对卫星宽带IP通信服务未来的前景作了展望。 相似文献
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对DVB多协议封装中的IP数据的分析 总被引:2,自引:0,他引:2
随着通信技术对安全保密要求的提高,常规的网络通信、无线电通信很少用来传输特殊用途的信息,而卫星信道越来越多地被用来传送某些信息如IP数据。为了获取这类信息,对承载IP数据的DVB标准及多协议封装(MPE)进行了深入研究,并结合实际数据使用专业软件对数据传送方式进行了详细分析,得到了负载内容,说明了信息获取的大致手段。 相似文献
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互联网的IP传输协议和卫星通信的DVB传输标准的融合,引发了新的宽带多媒体网络通信的革命,深圳市经天通信股份有限公司研发的PCVSATTM卫星多媒体通信系统一直走在VSAT通信的前沿,具有自己鲜明的技术特点和技术先进性,在国内拥有遍布各行业的众多知名用户。 相似文献
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中国教育卫星宽带网络采用基于DVB标准的电视、语音、IP相融合的宽带多媒体技术,并应用多种回传通道实现卫星因特网接入服务。目前,这一卫星宽带多媒体传输平台巳播出多态数据广播节目,并提供多个IP通道。此外,相关机构还正在利用这一平台推进“明天小学”远程教育收视点的建设,并实现现代远程教育扶贫示范工程项目。 相似文献
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数据挖掘技术及其在电子邮件中的应用 总被引:2,自引:0,他引:2
介绍了数据挖掘技术及电子邮件的传输原理,分析了垃圾邮件的数据特征及邮件炸弹的传输特性,针对海量电子邮件数据,将数据挖掘技术应用于电子邮件的安全管理中,并给出了在电子邮件安全管理中应用数据挖掘技术的简要过程。 相似文献
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传统电子邮件业务使用明文方式传送电子邮件,一旦窃听者捕获电子邮件报文,通过对邮件报文进行分析就能获取邮件内容。尽管当前存在一些解决方案能够提高电子邮件的安全性能,但只要窃听者拥有足够的计算能力,数据安全仍将无法保证。针对上述问题,本文提出了一种基于量子信道通信的邮件传输系统。在邮件传输过程中,将量子信道与传统信道结合使用,建立基于量子传输的SMTP协议和POP3协议。最终仿真结果表明,当邮件内容数据长度达到30比特时,量子邮件内容被窃取的可能性接近于0。因此,与传统的电子邮件传输系统相比,量子通信邮件传输系统能够保持较好的安全性能。 相似文献
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门户平台建设是“数字化校园”建设工作的重点,基于门户平台的邮件系统集成包括统一身份认证集成、信息门户集成和共享数据集成。针对这三大领域的集成提供了切实可行的技术解决方案,并实现了统一身份认证,用户登录门户后直接进入邮件系统,可在门户上自行注册校园邮件帐户、自主关联个人所属其他校园邮箱账号等功能,对其他院校从事该领域研究时提供一定的借鉴作用; 相似文献
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This study focuses on people's choices between electronic mail and voice mail. We found that users generally preferred electronic mail over voice mail for most communication purposes. These results do not support a hypothesis derived from media richness theory that voice mail would be preferred to e-mail for ambiguous situations. A more important finding is that other medium features besides richness influence individuals' media choices, specifically, medium features useful for retrieving and preparing messages and for working In group settings. From this and other evidence, we conclude that a complex set of social factors governs organizational media use in ways that neither theory can fully explain. Our findings have some interesting implications for designers of multimedia communication systems and for people like human resources specialists who are concerned with improving the effectiveness of professional work and the quality of working life 相似文献
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Yuan Li Liu Hongwei Bao Zheng 《电子科学学刊(英文版)》2007,24(2):199-203
To relax the target aspect sensitivity and use more statistical information of the High Range Resolution Profiles (HRRPs), in this paper, the average range profile and the variance range profile are extracted together as the feature vectors for both training data and test data representation. And a decision rule is established for Automatic Target Recognition (ATR) based on the minimum Kullback-Leibler Distance (KLD) criterion. The recognition performance of the proposed method is comparable with that of Adaptive Gaussian Classifier (AGC) with multiple test HRRPs, but the proposed method is much more computational efficient. Experimental results based on the measured data show that the minimum KLD classifier is effective. 相似文献
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Wen Chenglin Wang Tianzhen Hu Jing 《电子科学学刊(英文版)》2007,24(1):108-111
In this letter, the new concept of Relative Principle Component (RPC) and method of RPC Analysis (RPCA) are put forward. Meanwhile, the concepts such as Relative Transform (RT), Rotundity Scatter (RS) and so on are introduced. This new method can overcome some disadvantages of the classical Principle Component Analysis (PCA) when data are rotundity scatter. The RPC selected by RPCA are more representative, and their significance of geometry is more notable, so that the application of the new algorithm will be very extensive. The performance and effectiveness are simply demonstrated by the geometrical interpretation proposed. 相似文献
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This paper presents a longitudinal case study of the introduction of voice mail, applying media richness theory to develop and assess a set of 16 tasks with varying levels of equivocality, and to compare different media. Through t-tests, reliability, factor, and multidimensional scaling analyses, evaluation of task equivocality and voice mail is discussed and potential shortcomings of current approaches are highlighted. Results show that equivocality does not seem to be unidimensional and includes aspects of authority across organizational boundaries. Across all tasks, telephone would be most likely selected by respondents, but face-to-face and telephone were more likely to be selected for more equivocal tasks. Unlike prior studies, voice mail is perceived as similar to documents and face-to-face 相似文献
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随着互联网的发展,网络应用越来越广泛,电子邮件已经成为人们日常生活中通信和交流的重要手段之一,但垃圾邮件和病毒邮件问题也日益严峻,每天收到的垃圾邮件和病毒邮件数量已经超过了正常邮件,严重影响了用户对电子邮件的正常使用。文中从长尾理论的概念入手,简单介绍了长尾理论的应用,通过对过滤的垃圾邮件和病毒邮件进行统计和分析,揭示了垃圾邮件和病毒邮件也具有长尾现象,从中得出了防止和控制垃圾邮件和病毒邮件的新方法和新途径。 相似文献