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ICIMU 2011 : Proceedings of the 5th international Conference on Information Technology & Multimedia最新文献

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QOS provisioning in optical burst-switched networks 光突发交换网络中的QOS提供
A. Abdelouahab, Bechir Gattoufi, A. Al-Badi
QoS is an integral component of any networking system, particularly, with the current and future great diversity of the users' applications and their manifold requirements. It is believed that the IP layer may not be the convergence layer with respect to QoS. In this paper a new QoS mechanism is introduced for Optical Burst Switching (OBS) networks that support Staged Reservation Scheme (SRS). For the new QoS mechanisms to be realizable and efficient in the optical burst-switched networks, the simplicity principle was one of the most important design considerations.
QoS是任何网络系统不可缺少的组成部分,特别是在当前和未来用户应用及其需求的巨大多样性下。一般认为,IP层可能不是QoS的汇聚层。本文提出了一种支持分级保留的光突发交换(OBS)网络QoS机制。为了使新的QoS机制在光突发交换网络中实现和高效,简单性原则是最重要的设计考虑因素之一。
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引用次数: 2
Register flooding attacks detection in IP multimedia subsystems by using adaptive z-score CUSUM algorithm 基于自适应z-score CUSUM算法的IP多媒体子系统寄存器泛洪攻击检测
Elham Nosrati, A. Kashi, Yashar Darabian, S. M. H. Tonekaboni
IP Multimedia Subsystems (IMS) is the core of Next Generation Network (NGN) which provides high quality combination of different multimedia services. Although IMS open core architecture has made it an easy access network for clients, it has result in some security weaknesses and vulnerabilities, by which attacks and threats try to enter network. Denial of service attacks (DoS), prevent legitimate users from using services by overloading network resources. These attacks are usually based on sending flooding packets by spoofed IP addresses and are called Distributed Denial of Service (DDoS), these attacks can be generated through REGISTER messages that are followed by heavy weighted process of registration in Call Session Control Function (CSCF) entities. In this paper an adaptive CUSUM algorithm is proposed which can differ peak time traffic from attack traffic and detect flooding attacks with low values of False Alarm Rates (FAR) and of Detection Delays (DD) and Detection Time (DT).
IP多媒体子系统(IMS)是下一代网络(NGN)的核心,能够提供不同多媒体业务的高质量组合。尽管IMS开放核心体系结构使其成为客户端易于访问的网络,但它也导致了一些安全弱点和漏洞,攻击和威胁试图通过这些弱点和漏洞进入网络。拒绝服务攻击(DoS)通过使网络资源过载,阻止合法用户使用服务。这些攻击通常基于欺骗IP地址发送洪水报文,称为分布式拒绝服务攻击(DDoS),这些攻击可以通过注册消息产生,然后在CSCF (Call Session Control Function)实体中进行重加权注册过程。本文提出了一种自适应CUSUM算法,该算法能区分峰值流量和攻击流量,并能以较低的虚警率(FAR)、检测延迟(DD)和检测时间(DT)值检测洪水式攻击。
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引用次数: 5
Challenges and practical implementation of self-organizing networks in LTE/LTE-Advanced systems LTE/LTE- advanced系统中自组织网络的挑战和实际实现
M. M. S. Marwangi, N. Fisal, S. Yusof, R. Rashid, A. S. Ghafar, F. A. Saparudin, N. Katiran
Self-organizing network/s (SON) was promoted by the Third Generation Partnership Project (3GPP) and Next Generation Mobile Networks (NGMN). SON has been introduced since in 3GPP Release-8, Release-9 and currently included in Release-10 framework as an excellent solution that promises improvements and market potential for future wireless networks. The purpose of this paper is to provide an overview on SON in advanced wireless networks such as Long Term Evolution (LTE) and LTE-Advanced systems. Although SON promises several advantages for both network operators and users, there are still challenges in implementing SON network in reality. Therefore, this paper addresses those possible challenges, discusses about SON implementation in inter-cell interference of cross-tier networks and provides future trends of the research area.
自组织网络(SON)由第三代合作伙伴计划(3GPP)和下一代移动网络(NGMN)推动。自3GPP release 8、release 9以来,SON一直被引入,目前被包含在release 10框架中,作为一种出色的解决方案,它承诺改善未来的无线网络,并具有市场潜力。本文的目的是对长期演进(LTE)和LTE- advanced系统等先进无线网络中的SON进行概述。尽管SON为网络运营商和用户都带来了许多优势,但在现实中实现SON网络仍然存在挑战。因此,本文针对这些可能面临的挑战,讨论了跨层网络中小区间干扰的SON实现,并提出了该研究领域的未来趋势。
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引用次数: 23
User interestingness for pre-fetching in mobile environment 用户对移动环境下预取的兴趣
Roziyah Darus, H. Ibrahim, M. Othman, Lilly Suryani Affendey
In mobile environment, pre-fetching is used to prevent network congestion, delays and latency problems during disconnection. Lately, the pre-fetching strategies become more complicated in which to support new types of application especially in wireless environments. Due to this complication, new method is introduced where it requires data mining technique to improve the pre-fetching process. Previously, the pre-fetched data item is filtered using an data driven measurement for data interestingness and the data generated are based on the structure of a query pattern and quantified using statistical methods. The measurement is not good enough to solve the rule quality problems as in predicting next query in mobile environment. In this paper, a new measurement method is proposed to generate new criterion of prefetched data items before sending to mobile users. This method is improved by introducing user driven measurement for user interestingness where it will consider the subjectivity and the understandability of the users.
在移动环境中,预取是为了防止网络拥塞、延迟和断开时的延迟问题。近年来,为了支持新的应用类型,特别是在无线环境中,预取策略变得越来越复杂。由于这种复杂性,引入了一种新的方法,它需要数据挖掘技术来改进预取过程。以前,使用数据驱动的数据兴趣度量来过滤预获取的数据项,生成的数据基于查询模式的结构,并使用统计方法进行量化。在移动环境中,这种度量不足以解决预测下一个查询的规则质量问题。本文提出了一种新的测量方法,在发送给移动用户之前生成预取数据项的新标准。该方法通过引入用户驱动的用户兴趣度度量来改进,该度量将考虑用户的主观性和可理解性。
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引用次数: 1
A local estimation of node quantity and channel density for VoIP applications over IEEE 802.11e WLANs IEEE 802.11e无线局域网上VoIP应用的节点数量和信道密度的本地估计
M. F. Tuysuz, H. A. Mantar
IEEE 802.11 WLANs have reached an important stage and have become a common technology for wireless access due to its low cost, ease of deployment and mobility support. However, IEEE 802.11 standard cannot support desired Quality of Service (QoS) for delay-sensitive multimedia applications. Therefore, IEEE 802.11e standard which aims to support QoS by providing different priorities to different types of frames was specified in 2005. However, there are still unsolved performance issues such as optimization of throughput, limiting the delay and packet loss ratio. In this paper, we first present a local estimation method of node quantity and channel density to let the mobile nodes change their parameters according to the channel conditions. Then, we propose a QoS adaptation for delay-sensitive VoIP applications. Proposed algorithm only uses its local information and can be easily implemented without any changes on the current IEEE 802.11e standard. Simulation results show better voice quality and higher overall throughput than the standard IEEE 802.11e.
IEEE 802.11 wlan由于其低成本、易于部署和移动性支持,已经达到了一个重要的阶段,并已成为一种通用的无线接入技术。但是,对于延迟敏感型多媒体应用,IEEE 802.11标准不能支持期望的QoS (Quality of Service)。因此,IEEE 802.11e标准于2005年被指定,该标准旨在通过为不同类型的帧提供不同的优先级来支持QoS。但是,在吞吐量优化、时延限制、丢包率等性能问题上仍存在一些未解决的问题。本文首先提出了一种局部估计节点数量和信道密度的方法,使移动节点根据信道条件改变其参数。然后,针对延迟敏感型VoIP应用,提出了一种QoS适配方案。该算法仅利用其本地信息,无需对现行IEEE 802.11e标准进行任何更改即可轻松实现。仿真结果表明,与标准IEEE 802.11e相比,该协议具有更好的语音质量和更高的总体吞吐量。
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引用次数: 4
Application of data mining techniques in customer realationship management for an automobile company 数据挖掘技术在某汽车公司客户关系管理中的应用
Alicia Y. C. Tang, N. Azami, N. Osman
This work analyzes well-known DM techniques in Weka workbench, and reports the simulation results of applying four selected DM techniques and classifiers in the open source workbench to the Customer Relationship Management (CRM) problem in an automobile enterprise. It is proposed that data mining techniques to be used in aiding the salesperson and management of the enterprise for effective decision making. This approach was applied to 500 preprocessed records out of 2000 raw data sets for the past 5 years. Simulation results show that the large volume of customer historical data can play a value-added role for enterprise development in a way that the mined data helps them to study customer behavior so that personalized services can be provided. This paper also discusses the evaluation results of the four classifiers used in mining the customer data.
本文分析了Weka工作平台中知名的数据挖掘技术,并报告了将开源工作平台中选择的四种数据挖掘技术和分类器应用于某汽车企业客户关系管理(CRM)问题的仿真结果。提出利用数据挖掘技术帮助企业的销售人员和管理层进行有效的决策。该方法应用于过去5年2000个原始数据集中的500条预处理记录。仿真结果表明,大量的客户历史数据可以为企业的发展发挥增值作用,挖掘出来的数据可以帮助企业研究客户的行为,从而提供个性化的服务。本文还讨论了四种分类器在客户数据挖掘中的评价结果。
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引用次数: 5
PAPR analysis of coded-OFDM system and mitigating its effect with clipping, SLM and PTS 编码ofdm系统的PAPR分析及用裁剪、SLM和PTS减轻其影响
A. Joshi, D. Saini
In wireless communication, parallel transmission of symbols using multi carriers is applied to achieve high efficiency in terms of throughput and better transmission quality. Orthogonal Frequency Division Multiplexing (OFDM) is one of the techniques for parallel transmission. In multipath environment the performance of orthogonal frequency division multiplexing (OFDM) is improved by introducing some kind of channel coding. Coded OFDM (COFDM) is the new candidate for application such as DAB and DVB-T due to its better performance in fading environment. However high peak to average power ratio (PAPR) is a major demerit of OFDM system, it leads to increased complexity of circuit and reduced efficiency of RF amplifier. In this paper our aim is to evaluate the PAPR of COFDM system and reducing its effect by clipping, Selected Mapping (SLM) and Partial Transmit Sequence (PTS) techniques. COFDM system used here comply with IEEE 802.11a specifications and Reed Solomon (RS) codes along with convolution codes are used for channel coding purpose. Channel used for consideration is AWGN. The performance is evaluated in terms of PAPR value and BER.
在无线通信中,为了提高传输效率和传输质量,采用多载波并行传输符号。正交频分复用(OFDM)是并行传输的一种技术。在多径环境下,通过引入信道编码来提高正交频分复用(OFDM)的性能。编码OFDM (COFDM)因其在衰落环境下的良好性能而成为DAB和DVB-T等应用的新候选技术。然而,高峰值平均功率比(PAPR)是OFDM系统的一个主要缺点,它增加了电路的复杂性,降低了射频放大器的效率。本文的目的是评估COFDM系统的PAPR,并通过裁剪、选择映射(SLM)和部分传输序列(PTS)技术降低其影响。这里使用的COFDM系统符合IEEE 802.11a规范,使用RS码和卷积码进行信道编码。用于考虑的频道是AWGN。性能评估的PAPR值和误码率。
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引用次数: 8
Parallel execution of distributed SVM using MPI (CoDLib) 基于MPI (CoDLib)的分布式支持向量机并行执行
Nur Shakirah Md Salleh, A. Suliman, A. Ahmad
Support Vector Machine (SVM) is an efficient data mining approach for data classification. However, SVM algorithm requires very large memory requirement and computational time to deal with very large dataset. To reduce the computational time during the process of training the SVM, a combination of distributed and parallel computing method, CoDLib have been proposed. Instead of using a single machine for parallel computing, multiple machines in a cluster are used. Message Passing Interface (MPI) is used in the communication between machines in the cluster. The original dataset is split and distributed to the respective machines. Experiments results shows a great speed up on the training of the MNIST dataset where training time has been significantly reduced compared with standard LIBSVM without affecting the quality of the SVM.
支持向量机(SVM)是一种高效的数据挖掘方法。然而,支持向量机算法需要非常大的内存需求和计算时间来处理非常大的数据集。为了减少SVM训练过程中的计算时间,提出了一种分布式和并行计算相结合的方法——CoDLib。使用集群中的多台机器进行并行计算,而不是使用单个机器进行并行计算。消息传递接口(Message Passing Interface, MPI)用于集群中机器之间的通信。原始数据集被拆分并分发到各自的机器上。实验结果表明,在不影响SVM质量的前提下,MNIST数据集的训练速度大大提高,训练时间比标准LIBSVM显著缩短。
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引用次数: 11
A conceptual knowledge management framework in consultancy services 咨询服务中的概念性知识管理框架
Nur Atiqah Bt Mohamed Farid, M. S. Ahmad
In 2007, Universiti Tenaga Nasional (UNITEN) was established as one of the first private universities in Malaysia that provides quality and excellent services in education (teaching and learning), research, and consultancy. Along with the establishment, the UNITEN Training and Consultancy (UTC) Unit was instituted as a channel for UNITEN lecturers in extending their skills to the external parties relating to consultancy, training, and short courses. However, there exists no platform for the knowledge created out of these jobs to be shared with other lecturers. This paper proposes the development of a conceptual knowledge management framework as a new consultancy service framework encompassing both internal UNITEN processes and its clients.
2007年,马来西亚国立Tenaga大学(UNITEN)成立,是马来西亚首批提供优质教育(教学和学习)、研究和咨询服务的私立大学之一。在设立培训和咨询股的同时,还设立了训研所培训和咨询股,作为训研所讲师向外部各方提供咨询、培训和短期课程方面的技能的渠道。然而,没有一个平台可以让这些工作所创造的知识与其他讲师分享。本文提出了一种概念性知识管理框架的发展,作为一种新的咨询服务框架,包括内部UNITEN流程及其客户。
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引用次数: 1
English text compression for small messages 小消息的英文文本压缩
Abhishek Kumar, Syed Mushtaq Ahmed, Vipin Kumar Duleb
The problem of compressing small messages has become very important in today's world as there is a shift towards a global mobile environment. The mobile world is characterized by lot of critical resources one of them being bandwidth. Saving in bandwidth directly counts as saving in cost. Compression of on-the-fly data is by far the most commonly used method to reduce the amount of data being sent. In this paper we propose a novel encoding scheme for small text messages. We have developed this encoding scheme using English as a reference language. We have compared our algorithm to current compression methods which are superior when performed on large texts but do not work well for small messages. We found that our algorithm compresses data by at least 20% better than other methods.
随着全球移动环境的转变,压缩小消息的问题在当今世界变得非常重要。移动世界的特点是有很多关键资源,其中之一就是带宽。节省带宽直接计算为节省成本。压缩动态数据是目前最常用的减少发送数据量的方法。本文提出了一种新的小文本信息编码方案。我们使用英语作为参考语言开发了这种编码方案。我们已经将我们的算法与当前的压缩方法进行了比较,这些方法在处理大文本时性能优越,但在处理小消息时效果不佳。我们发现我们的算法比其他方法至少压缩了20%的数据。
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引用次数: 0
期刊
ICIMU 2011 : Proceedings of the 5th international Conference on Information Technology & Multimedia
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