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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
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
Fitted dynamic framed slotted ALOHA anti-collision algorithm in RFID systems RFID系统中的拟合动态框架开槽ALOHA防碰撞算法
M. Shakiba, A. Zavvari, E. Sundararajan
Radio Frequency Identification (RFID) system is a new communication technology to identify the objects using electromagnetic waves. The main superiority of RFID systems in comparison with other identification systems, such as barcodes, is its ability in simultaneous identification process, but when more than one tag wants to communicate with the reader, collision problem occurs and wastes time and increases energy consumption. This reduces efficiency of the identification process in RFID systems. Collision problem happens when the reader has to identify more than one tag at the same time. Consequently, it is essential to develop an efficient anti-collision algorithm to save the time and energy and increase the performance of the system. In this paper, after investigating the previous works on ALOHA-based anti-collision algorithms, a new anti-collision algorithm is presented to improve the DFSA ALOHA-based anti-collision algorithms. Evaluation of the ALOHA-based algorithms and simulation of the results illustrate that presented work recognizes the tags more efficiently by reducing the number of time slots.
射频识别(RFID)系统是一种利用电磁波对物体进行识别的新型通信技术。与条形码等其他识别系统相比,RFID系统的主要优势在于其同时识别的能力,但当多个标签要与读写器通信时,就会出现碰撞问题,浪费时间,增加能耗。这降低了RFID系统中识别过程的效率。当阅读器必须同时识别多个标签时,就会发生冲突问题。因此,为了节省时间和精力,提高系统的性能,开发一种高效的防碰撞算法至关重要。本文在研究了前人关于基于aloha的防碰撞算法的研究成果的基础上,提出了一种新的基于DFSA aloha的防碰撞算法。对基于aloha的算法的评估和仿真结果表明,通过减少时隙的数量,所提出的工作可以更有效地识别标签。
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引用次数: 15
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
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
Flies species recognition for maggot therapy using neural-expert technique 基于神经专家技术的蝇类识别与蛆治疗
Nursyafinaz Md Yusoff, N. H. A. Hamid, S. A. Halim
Maggot Debridement Therapy (MDT) has been recognized as one of the effective alternative treatment to enhance healing and to decrease the mortality associated with underlying injury. One of the most important procedures in performing MDT is to use the correct maggot from suitable species. In this case, maggots from the incorrect species would consume the live tissue instead of the dead tissue. Hence, this is highlighted as one of the difficulties in implementing MDT. Currently the process of identifying flies is done manually by experts or by using DNA traits. We explored and developed another procedure to recognize the species using hybrid neuro-expert technique. The percentage of correctness using standard back propagation neural network yields 94.4% accuracy. By adapting the neuro-expert technique, the prototype accuracy is 100%.
蛆清创治疗(MDT)已被认为是一种有效的替代治疗方法,以提高愈合和降低死亡率相关的潜在损伤。执行MDT的最重要程序之一是使用来自合适种类的正确蛆虫。在这种情况下,来自错误物种的蛆会消耗活组织而不是死组织。因此,这被强调为执行MDT的困难之一。目前,鉴定苍蝇的过程是由专家手工完成的,或者是利用DNA特征完成的。我们探索并开发了另一种程序,使用混合神经专家技术来识别物种。使用标准反向传播神经网络的正确率为94.4%。通过采用神经专家技术,原型准确率达到100%。
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引用次数: 3
期刊
ICIMU 2011 : Proceedings of the 5th international Conference on Information Technology & Multimedia
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