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《计算机应用与软件》2014,(6)
在P2P流媒体系统中,数据调度算法是决定视频播放质量和系统性能的核心部分。针对当前P2P流媒体数据调度算法未能考虑节点带宽和服务能力的差异,从而造成对系统资源利用不充分的问题,提出一种基于贡献度的自适应(CBA)流媒体数据调度算法。算法定义节点贡献度来衡量节点的数据上传和可用带宽情况,预先向部分节点传输准备数据。并根据数据块优先级、带宽估计情况和节点贡献度等信息进行自适应调整,确定数据块请求的提供方和次序。仿真实验表明,CBA算法能充分地利用节点可用带宽,降低流媒体的启动延迟和服务器负载,改善系统的整体性能。 相似文献
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近年来,流媒体技术在现代远程教学中得到广泛的应用,流媒体技术不会占用大量的网络带宽,能很好地解决了大容量的视频音频数据在现有网络中流畅传输。本文首先介绍了现代远程教育的相关概念和流媒体技术的相关知识,然后探讨了基于流媒体技术的网络远程教学系统的构建。 相似文献
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讨论了多媒体通信系统的组播安全问题,提出了一整套结合高级加密标准AES的流媒体系统组播安全的方案,解决了用户安全注册、源认证、组成员认证以及视频数据保密等问题。并分析了如何在流媒体服务器端、组管理服务器端与客户端实现,在组管理服务器端给出了一种改进的身份认证方法,该方法可抵抗字典口令攻击。 相似文献
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流媒体(Streaming Media)是一种新兴的网络传榆技术,广泛应用在互联网上实时传输、播放音、视频等多媒体数据,流媒体技术包括流媒体数据的采集、音/视频编解码、存储、传输以及播放等领域.嵌入式流媒体,顾名思义,需要考虑嵌入式系统以及流媒体技术两方面的特点.本文介绍了一种基于S3C2410与MPEG-4的嵌入式流媒体播放器的软件和硬件的设计与实现. 相似文献
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The SoC paradigm is a system integration approach that integrates large numbers of transistors as well as various mixed-signal active and passive components onto a single chip. This realization-led to the 3D system-in-package (SiP) approach, alternatively called 3D ICs or 3D stacked die/package. Designers can take SiP a step further by embedding both active and passive components, but passive-component embedding is bulky and requires thick-film discrete components. Thick-film component embedding distinguishes SiP from system on package (SoP), an emerging 3D system integration concept that involves embedding both active and passive components. SoP, however, incorporates ultrathin films at microscale to embed the passive components, and the package rather than the board is the system. SoP overcomes both the computing and integration limitations of SoC, SiP, multichip modules (MCMs), and traditional system packaging by having global wiring as well as RF, digital, and optical component integration in the package instead of on the chip. Moreover, 3D SoP addresses the wire delay problem by enabling the replacement of long, slow global interconnects with short, fast vertical routes. 相似文献
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Fully‐integrated active matrix programmable UV and blue micro‐LED display system‐on‐panel (SoP) 下载免费PDF全文
Ke Zhang Deng Peng Kei May Lau Zhaojun Liu 《Journal of the Society for Information Display》2017,25(4):240-248
High pixel per inch and high‐resolution micro‐LED displays are attracting more and more attentions. The increasing pixel number requires a large amount of bonding pads and brings huge difficulties to micro‐LED system design and lowers power efficiency as well. It is urgent to integrate row and column driving circuits onto the micro‐LED panel. Here, we report a fully integrated active matrix programmable micro‐LED system on panel (SoP) with ultraviolet and blue emission wavelengths. The micro‐LED SoP has a resolution of 60 × 60 and pixel pitch of 70 μm. The micro‐LED SoP was achieved by integrating micro‐LED arrays with silicon‐based p‐channel metal‐oxide semiconductor driving panel using fine‐toned flip‐chip bonding technology. With fully integrated scan and data circuits, the number of bonding pads was greatly reduced from 136 to 28, and large amount of metal interconnection lines were saved. The micro‐LED SoP panel was mounted on a periphery driving board, and representative characters were displayed successfully. 相似文献
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企业网安全防范策略 总被引:1,自引:0,他引:1
朱荆州 《计算机与数字工程》2003,31(1):11-17
本文从网络设计的安全性、系统配置的安全性、病毒防范三个方面作了企业网安全防范的探索,并通过总结某研究所所内网的安全实例,初步提出了一些可操作的实用的安全防范策略。 相似文献
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对移动智能网的过负荷控制算法进行了研究。在总结固定智能网的过负荷控制思想和算法的基础上,针对移动智能网的负荷特点提出了一种新的基于两级许可证过负荷控制算法,并根据实际应用的要求进行了进一步完善。 相似文献
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Silvia García-Díez Author Vitae François Fouss Author Vitae 《Pattern recognition》2011,44(6):1172-1182
This paper introduces a simple Sum-over-Paths (SoP) formulation of string edit distances accounting for all possible alignments between two sequences, and extends related previous work from bioinformatics to the case of graphs with cycles. Each alignment ℘, with a total cost C(℘), is assigned a probability of occurrence P(℘)=exp[−θC(℘)]/Z where Z is a normalization factor. Therefore, good alignments (having a low cost) are favored over bad alignments (having a high cost). The expected cost ∑℘∈PC(℘)exp[−θC(℘)]/Z computed over all possible alignments ℘∈P defines the SoP edit distance. When θ→∞, only the best alignments matter and the measure reduces to the standard edit distance. The rationale behind this definition is the following: for some applications, two sequences sharing many good alignments should be considered as more similar than two sequences having only one single good, optimal, alignment in common. In other words, sub-optimal alignments could also be taken into account. Forward/backward recurrences allowing to efficiently compute the expected cost are developed. Virtually any Viterbi-like sequence comparison algorithm computed on a lattice can be generalized in the same way; for instance, a SoP longest common subsequence is also developed. Pattern classification tasks performed on five data sets show that the new measures usually outperform the standard ones and, in any case, never perform significantly worse, at the expense of tuning the parameter θ. 相似文献
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通过对DSLAM设备网管脱管故障的原因进行分析,提出了现场问题的分析处理方法和流程,并对于常见的SNMP攻击、UDP攻击进行了深入分析,通过捕获报文结构、提出系统策略中对一些问题的不合理处置将导致可被攻击的缺陷。 相似文献
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本文分析了当前IDC网络环境中存在的安全隐患及网络攻击的手段,针对IDC中心的网络实际情况,从理论上提出了网络安全设计的原则、安全防御的策略和措施,列举了解决网络安全问题的相关技术,探讨建立综合性的网络安全防御系统确保网络及信息的安全。 相似文献
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在给出传统流媒体体系结构图的基础上,分析了移动流媒体与其不同的技术原理。然后提出了当前发展移动流媒体存在的技术上的局限性主要是由于计算机网络技术和无线通信技术的发展滞后造成的,接着探讨了为解决这些问题而应采取的几种策略。为进一步研究开发移动流媒体技术并实现移动流媒体技术的广泛应用提供了一些有益的思路。 相似文献