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Advanced multicast service scheduling mechanism with IGMP snooping in WDM-PON WDM-PON中基于IGMP snooping的组播业务调度机制
Namuk Kim, H. Yun, Jeong-Ju Yoo, Tae-Yeon Kim, Byeong-Whi Kim, Minho Kang
In this paper, we deal with the multicast service management to efficiently support the broadcasting TV and the near real time high quality VoD (video on demand) service though the data communication networks. This is an emerging issue of the next generation network. Until now, several network architectures have been proposed but most of these have been concentrated on increase of the basic network bandwidth or induced the higher system complexity. The hybrid WDM-PON guarantees both kinds of traffic the independent and stable service by introducing the shared broadcast wavelength for multicast group traffic service. The proposed dynamic multicast group scheduling (DMGS) based on hybrid WDM-PON efficiently supports the common Internet traffic as well as the large number of multicast groups by maximizing the service share-index of registered multicast groups which uses the broadcast wavelength in real time
为了有效地支持广播电视和近实时的高质量视频点播业务,本文对多播业务进行了管理。这是下一代网络的一个新兴问题。到目前为止,已经提出了几种网络架构,但大多数都集中在增加基本网络带宽或引起更高的系统复杂性。混合WDM-PON通过为组播组业务引入共享的广播波长,保证了两种业务的独立性和稳定性。提出的基于混合WDM-PON的动态组播组调度(DMGS),通过实时利用广播波长最大化注册组播组的业务共享指数,有效地支持Internet通用流量和大量组播组
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引用次数: 3
AVCoS: the component-based video conference service overactive networks 视频会议业务:基于组件的视频会议业务
Yang-Hui Chang, T. Chung
Nowadays, a video conference service is a provider-dependent service, in which conferencing users must manually pre-install same conferencing software before a conferencing session startups. Furthermore, the conferencing users must comply with requirements of the un-adaptable service. In this paper, we propose an active video conference service (AVCoS) over Yuan active networks (YAN) [Yang-Hui Chang et al. (2002)]. Following YAN architecture, AVCoS consists of application, value-added and network generic layer components. The components are extendable, replaceable and deployable. Via service compositions of YAN, AVCoS allows a user can customize a template service describing profile, called "ASDI", which describes how to composite those components. Therefore, the user can adapt functionalities of the service by a homepage to meet current conference node environment and network environment Then, Active Service Deployment Protocol (ASDP) will deploy software components of AVCoS to active nodes and the users on the fly according to customized ASDI. Thus, AVCoS adapts itself to meet heterogeneous users
目前,视频会议业务是依赖于供应商的业务,会议用户在会议开始之前必须手动预装相同的会议软件。此外,会议用户还必须满足不适应业务的要求。在本文中,我们提出了一种基于元有源网络(YAN)的有源视频会议服务(AVCoS) [Chang Yang-Hui et al.(2002)]。avco采用YAN架构,由应用层、增值层和网络通用层组成。这些组件是可扩展、可替换和可部署的。通过YAN的服务组合,avco允许用户自定义描述概要文件的模板服务,称为“ASDI”,它描述了如何组合这些组件。因此,用户可以通过一个主页来调整服务的功能,以适应当前的会议节点环境和网络环境。然后,ASDP (Active service Deployment Protocol)将根据定制的ASDI,动态地将avco的软件组件部署到活动节点和用户。因此,AVCoS可以适应不同类型的用户
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引用次数: 0
A novel method for noise cancellation of speech signals using wavelet packets 一种基于小波包的语音信号去噪方法
Ali Tinati, B. Mozaffary
In this paper a novel method for cancellation of broadband/narrowband noise from speech signals is proposed. Independent component analysis (ICA) and wavelet packet approaches have been combined for blind noise separation from mixtures of speech signals. ICA method is used to estimate matrix A, which defines how the mixture signals have been mixed. Wavelet packets are used for de-correlation of approximation of noise and speech. This algorithm is applied to real data with high SNRs and has been able to completely retrieve speech signal from white background noise successfully
本文提出了一种消除语音信号中宽带/窄带噪声的新方法。将独立分量分析(ICA)和小波包方法相结合,对混合语音信号进行盲噪声分离。采用ICA方法对矩阵A进行估计,矩阵A定义了混合信号的混合方式。小波包用于噪声和语音的去相关逼近。将该算法应用于高信噪比的实际数据中,成功地从白背景噪声中完全提取语音信号
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引用次数: 10
Steganalysis of facsimile 传真的隐写分析
Yunbiao Guo, Xingang You, Chuntian Zhang, Lan Hu, Linna Zhou
Communications associated with illicit activity has become a new focus of advanced communication technology. A steganographic method of binary image, which embeds data in facsimile by modifying the runlength of black pixel can build a covert communication over fax. This letter presents a steganalytic scheme to detect the message embedded in facsimile using run-length modification method. The detection is based on estimation of the original run-length distribution from the stego-facsimile, which is done by filtering stego-facsimile with corresponding filter. Experimental result indicates that relative modifications as small as 10% of usable run-length can be reliably detected
与非法活动有关的通信已成为先进通信技术的新焦点。一种二值图像隐写方法,通过修改黑像素的行距将数据嵌入传真中,实现传真上的秘密通信。本文提出了一种利用码长修改法检测传真中嵌入信息的隐写分析方案。该检测方法基于对隐写传真原始码长分布的估计,利用相应的滤波器对隐写传真进行滤波。实验结果表明,相对偏差仅占可用行程长度的10%就能被可靠地检测出来
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引用次数: 0
Analysis of TCP SYN traffic: an empirical study TCP SYN流量分析:一个实证研究
Seungwon Shin, Kiyoung Kim, Jongsoo Jang
There are a lot of studies that have measured TCP traffic, but none of them provide the investigation results of TCP SYN packet. In this paper, we show and explain common behavior of TCP SYN packets in traces from a research center using various statistical analysis methods. We selected three parameters to find the behavior of TCP SYN traffic - number of received SYN packets in every 10 ms, SYN PPS (packet per second), and SYN/TCP (ratio between SYN packets and total TCP packets every in 10ms). Our analysis mechanisms are divided into two groups. We started our examination with general statistical tool to provide the knowledge of data distribution. In the second place, we applied change point detection algorithm to our traces to discover the change of state. We summarized our findings in two main categories, qualitative and quantitative. In qualitative findings, we exhibit the characteristics of arising TCP connection and the amount of SYN packet existing in real network and also expose which parameter can explain the characteristics of SYN traffic well. Quantitative findings provide lots of numerical examples to support qualitative findings
目前已有很多研究对TCP流量进行了测量,但都没有提供对TCP SYN报文的调查结果。在本文中,我们展示和解释了TCP SYN包的共同行为,从一个研究中心使用各种统计分析方法。我们选择了三个参数来查找TCP SYN流量的行为——每10毫秒内接收到的SYN包的数量、SYN PPS(每秒包数)和SYN/TCP(每10毫秒内SYN包数与总TCP包数的比率)。我们的分析机制分为两组。我们从通用的统计工具开始我们的研究,以提供数据分布的知识。其次,我们对轨迹应用变化点检测算法来发现状态的变化。我们将研究结果分为定性和定量两大类。在定性研究中,我们展示了实际网络中产生的TCP连接和存在的SYN包数量的特征,并揭示了哪些参数可以很好地解释SYN流量的特征。定量研究结果提供了大量的数值例子来支持定性研究结果
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引用次数: 4
The mobile controlled handover method for fixed mobile convergence between WLAN, CDMA and LAN 无线局域网、CDMA和局域网之间固定移动融合的移动控制切换方法
HyangDuck Cho, JaeKyun Park, Keumsang Lim, Jong-Woo Kim, Wooshick Kim
The wired wireless integration network (WWIN) can be sorted out two approach ways of fixed mobile convergence (FMC) and fixed mobile integration (FMI). FMC means the convergence of the existing wired network and wireless network. The FMC infrastructure consists of wired and wireless network infra. Therefore a mobile device needs the function of connection method on the FMC infrastructure. Handover is one of methods for channel connect and connection control. Authors develop the mobile controlled handover algorithm, which can keep channel continuity in the wired wireless mixture network environment that consists of WLAN, CDMA and wired network. Mobile controlled handover algorithm accesses data by using transport layer and TCP/IP through each network in the wired wireless mixture network environment. User can move freely by using PDA in the wired wireless mixture network environment. Mobile controlled handover maintains the channel and the seamless transmission from PDA to server to provide real time service continuity. The channel of mobile controlled handover and the result of data transmission are presented by using data recorded on server. It is expected that the result of this thesis will contribute for a study on FMC network by using the wired wireless mixture network
有线无线集成网络(WWIN)可分为固定移动融合(FMC)和固定移动融合(FMI)两种途径。FMC是指现有有线网络和无线网络的融合。FMC基础设施由有线和无线网络基础设施组成。因此,移动设备需要在FMC基础设施上实现连接方式的功能。切换是信道连接和连接控制的方法之一。在由WLAN、CDMA和有线组成的有线-无线混合网络环境下,提出了一种保持信道连续性的移动控制切换算法。在有线无线混合网络环境下,移动控制切换算法通过传输层和TCP/IP协议在各网络之间进行数据访问。利用PDA,用户可以在有线无线混合网络环境下自由移动。移动控制切换保持了从PDA到服务器的通道和无缝传输,提供了实时的服务连续性。利用服务器上记录的数据,给出了移动控制切换的通道和数据传输结果。期望本文的研究成果能对利用有线无线混合网络进行FMC网络的研究有所贡献
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引用次数: 10
Design of performance analysis model for efficient random access protocol in CDMA based OFDMA-PHY system 基于CDMA的OFDMA-PHY系统中高效随机接入协议的性能分析模型设计
Hyunhwa Seo, B. Ryu, J. Won, Choong-Ho Cho, Hyong-Woo Lee
Currently, IEEE 802.16a wireless MAN supports the contention based OFDMA-CDMA ranging subsystem for ranging operation (initial ranging, periodic ranging, bandwidth request). This system is basically similar to slotted ALOHA (K. Leonard and S.S. Lam, April 1975), but the frame size (code-slot/frame) allocated for random access or ranging request is relatively big and can be altered by the dynamic adjustment of downlink and uplink subframe size on the MAC frame of OFDMA-PHY system. In this paper, the design performance analytical model for correct interpretation of ranging subsystem is presented. Until now, the Internet traffic study have achieved wire net, but there is still a need for Internet traffic study that correctly reflects the radio environment. In this paper, the performance analysis result of this paper can perform the reference mark for random access protocol in OFDMA-CDMA ranging system. Traffic modeling can also be used to prepare the network resources in radio networks
目前,IEEE 802.16a无线城域网支持基于争用的OFDMA-CDMA测距子系统进行测距操作(初始测距、周期测距、带宽请求)。该系统基本类似于有槽ALOHA (K. Leonard and S.S. Lam, April 1975),但分配给随机访问或测距请求的帧大小(码槽/帧)比较大,可以通过OFDMA-PHY系统MAC帧上的下行和上行子帧大小的动态调整来改变。本文提出了测距子系统正确判读的设计性能分析模型。到目前为止,互联网流量研究已经实现了有线网络,但仍然需要正确反映无线电环境的互联网流量研究。本文的性能分析结果可以为OFDMA-CDMA测距系统中的随机接入协议提供参考。通信量建模还可以用于无线网络中网络资源的准备
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引用次数: 2
Design of unified key management model using XKMS 基于XKMS的统一密钥管理模型的设计
Ju-Han Kim, Kiyoung Moon
In this paper, we design key management protocols and services with unified single interface, which extend the scheme and services of XKMS, for various kinds of security information such as, private key, secret key, biometric information, security tokens for Web service, and the like. The model we propose modifies and extends the protocols and services such as key registration, reissue, revocation, recovery, location service and validation for only public key pair to provide a way to manage other security information including public key pair. We also describe the processes and structures of the model comparing to legacy them of XKMS model
本文设计了具有统一接口的密钥管理协议和服务,扩展了XKMS的方案和服务,适用于各种安全信息,如私钥、密钥、生物特征信息、Web服务安全令牌等。该模型对仅针对公钥对的密钥注册、补发、撤销、恢复、位置服务和验证等协议和服务进行了修改和扩展,从而提供了一种管理包括公钥对在内的其他安全信息的方法。我们还描述了模型的过程和结构,并与XKMS模型的遗留过程和结构进行了比较
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引用次数: 2
Improvement of the transmission efficiency with transmit diversity scheme in multi-band OFDM systems 用发射分集方案提高多频带OFDM系统的传输效率
Ki-nam Kim, Jin-Ho Kim, Jung-Hoon Song, Sung-Joon Cho
In this paper, multi-band orthogonal frequency division multiplexing (MB-OFDM) system is analyzed as a strong candidate for wireless personal area network (WPAN) standard. MB-OFDM system provides the information data rate from 53.3 Mbps to 480 Mbps according to the used bandwidth. Also, the frequency/time-domain spreading schemes supply the frequency diversity gain but they decrease the transmission efficiency per unit time. To compensate this problem, the transmit diversity scheme is proposed where a symbol is repeatedly transmitted at the space domain. The bit error rate (BER) performance of the proposed system is confirmed by simulation
本文分析了多频段正交频分复用(MB-OFDM)系统作为无线个人区域网络(WPAN)标准的有力候选系统。MB-OFDM系统根据所使用的带宽提供53.3 ~ 480mbps的信息数据速率。此外,频域/时域扩展方案提供了频率分集增益,但降低了单位时间的传输效率。为了弥补这一问题,提出了在空间域中重复传输一个符号的发射分集方案。通过仿真验证了该系统的误码率性能
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引用次数: 0
Mobile agents aided multicast routing in mobile ad hoc networks 移动代理辅助移动自组织网络中的组播路由
H. Shekhar, M.A.A. Kumar, K. Ramanatha
Multicast routing protocols proposed for mobile ad hoc networks have certain limitations. Most of these protocols try to discover the route on-demand by flooding route request messages, which results in increased end-to-end latency and also consumes considerable amount of network bandwidth. These limitations make protocols not suitable for real-time multimedia communication. In this paper, we have presented an efficient mobile agents aided multicast routing (MAMR) protocol which overcomes these limitations. The protocol is a hybrid protocol where intelligent mobile agents can been integrated with existing on-demand multicast routing protocols such as multicast ad hoc on-demand distance vector (MAODV) routing protocol, on-demand multicast routing protocol (ODMRP) routing protocol and others. Here, the mobile agents move around the network and collect the routing information. This routing information assists on-demand multicast routing protocols in discovering the route in a definite path instead of flooding the route request messages, thereby achieving better end-to-end latency and reduced control traffic in the network. We have used MAODV protocol as an underlying protocol with mobile agents. The proposed MAMR protocol and MAODV have been compared through extensive simulations with end-to-end latency, packet delivery ratio and control overhead as performance parameters
针对移动自组织网络提出的组播路由协议存在一定的局限性。这些协议中的大多数都试图通过淹没路由请求消息来按需发现路由,这会导致端到端延迟增加,并且还会消耗大量的网络带宽。这些限制使得协议不适合实时多媒体通信。在本文中,我们提出了一种高效的移动代理辅助组播路由(MAMR)协议,克服了这些限制。该协议是一种混合协议,智能移动代理可以与现有的按需多播路由协议集成,如多播自组织按需距离矢量(MAODV)路由协议、按需多播路由协议(ODMRP)路由协议等。在这里,移动代理在网络中移动并收集路由信息。这些路由信息有助于按需组播路由协议在确定的路径中发现路由,而不是淹没路由请求消息,从而实现更好的端到端延迟和减少网络中的控制流量。我们使用MAODV协议作为移动代理的底层协议。本文以端到端延迟、分组传送率和控制开销作为性能参数,对所提出的MAMR协议和MAODV进行了广泛的仿真比较
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引用次数: 12
期刊
The 7th International Conference on Advanced Communication Technology, 2005, ICACT 2005.
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