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2011 IEEE Workshops of International Conference on Advanced Information Networking and Applications最新文献

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A Publish/Subscribe Communication Infrastructure for VANET Applications 面向VANET应用程序的发布/订阅通信基础结构
Tulika Mishra, D. Garg, M. M. Gore
Vehicular Ad-hoc Network (VANET) can be envisaged as the network of moving vehicles communicating in asynchronous and autonomous fashion. Efficient and scalable information dissemination is a major challenge due to the movement of vehicles which causes unpredictable changes in network topology. Publish/Subscribe communication paradigm provides decoupling in time, space and synchronization between communicating entities, making it most suitable for VANET like environments. In this paper, we propose our publish/subscribe framework for information dissemination in VANET. In our approach, we assumed a hybrid VANET consisting of stationary info-stations and moving vehicles where each vehicle can take the role of publisher, subscriber or broker. Every major crossing of city is equipped with stationary info-stations that act as ultimate place holders for publications and subscriptions. These info-stations are assumed to be connected to internet and form Distributed Hash Table (DHT) based broker overlay among themselves. They act as rendezvous point for publications and subscriptions and send matching publications to interested subscribers. Further, these info-stations also provide services for locating any vehicle in the network. Simulation results indicate that our approach performs well with increasing number of vehicles which suggests the applicability of our approach.
车辆自组织网络(VANET)可以被设想为移动车辆以异步和自主方式通信的网络。由于车辆的移动会导致网络拓扑结构发生不可预测的变化,因此有效和可扩展的信息传播是一个重大挑战。发布/订阅通信范式在通信实体之间提供时间、空间和同步的解耦,使其最适合VANET之类的环境。在本文中,我们提出了我们的VANET信息发布/订阅框架。在我们的方法中,我们假设一个由固定信息站和移动车辆组成的混合VANET,其中每个车辆可以扮演发布者、订阅者或代理的角色。城市的每个主要路口都配备了固定的信息站,作为出版物和订阅的最终位置持有者。假定这些信息站连接到internet,并在它们之间形成基于分布式哈希表(DHT)的代理覆盖。它们充当发布和订阅的集合点,并将匹配的发布发送给感兴趣的订阅者。此外,这些信息站还提供定位网络中任何车辆的服务。仿真结果表明,随着车辆数量的增加,该方法具有良好的性能,表明了该方法的适用性。
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引用次数: 44
The Degree of Masking Fault Tolerance vs. Temporal Redundancy 屏蔽容错程度与时间冗余
Nils Müllner, Oliver E. Theel
Self-stabilizing systems, intended to run for a long time, commonly have to cope with transient faults during their mission. We model the behavior of a distributed self-stabilizing system under such a fault model as a Markov chain. Adding fault detection to a self-correcting non-masking fault tolerant system is required to progress from non-masking systems towards their masking fault tolerant functional equivalents. We introduce a novel measure, called limiting window availability (LWA) and apply it on self-stabilizing systems in order to quantify the probability of (masked) stabilization against the time that is needed for stabilization. We show how to calculate LWA based on Markov chains: first, by a straightforward Markov chain modeling and second, by using a suitable abstraction resulting in a space-reduced Markov chain. The proposed abstraction can in particular be applied to spot fault tolerance bottlenecks in the system design.
自稳定系统的目的是长时间运行,通常必须在其任务期间处理瞬态故障。在这种故障模型下,我们将分布式自稳定系统的行为建模为马尔可夫链。将故障检测添加到自纠错的非屏蔽容错系统中,需要从非屏蔽系统向其屏蔽容错功能等同发展。我们引入了一种新的度量,称为限制窗口可用性(LWA),并将其应用于自稳定系统,以便根据稳定所需的时间来量化(屏蔽)稳定的概率。我们展示了如何基于马尔可夫链计算LWA:首先,通过直接的马尔可夫链建模,其次,通过使用适当的抽象产生空间缩减的马尔可夫链。提出的抽象可以特别应用于系统设计中的容错瓶颈。
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引用次数: 8
Towards Improvement of Active XML Representation 主动XML表示的改进
Binh Viet Phan, E. Pardede, J. Rahayu
Active XML (AXML) as an intensional XML Data aims to exploit potential computing power of XML, Web services and P2P architecture. It is considered as a powerful extension of XML to deal with dynamic XML data from autonomous and heterogeneous data sources at very large scale via Web services. However, AXML is still immature, so there are various issues to be investigated before it can be accepted widely. This paper will focus towards analyzing the current AXML representation and proposing improvements. It is expected that the new AXML representation will lay out foundation for improvements of AXML systems.
活动XML (AXML)作为一种内涵XML数据,旨在利用XML、Web服务和P2P体系结构的潜在计算能力。它被认为是XML的强大扩展,可以通过Web服务大规模地处理来自自治和异构数据源的动态XML数据。然而,AXML仍然不成熟,因此在它被广泛接受之前,还有各种各样的问题需要研究。本文将重点分析当前的AXML表示并提出改进建议。预计新的AXML表示将为改进AXML系统奠定基础。
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引用次数: 2
A Sensor Relocation Scheme for Wireless Sensor Networks 一种用于无线传感器网络的传感器重定位方案
M. Asim, H. Mokhtar, Muhammad Zahid Khan, M. Merabti
In the past few years wireless sensor networks have received a greater interest in application such as disaster management, border protection, combat field reconnaissance and security surveillance. Sensor nodes are expected to operate autonomously in unattended environments and potentially in large numbers. WSNs cannot be deployed manually in a hostile or harsh environment. Thus, WSNs can be formed by dropping them from the air. However, random deployment of sensor nodes can leave holes in terms of coverage in the sensing area. Moreover, sensor nodes failure may cause connectivity loss and in some cases network partitioning. The mobile devices can be used as an orthogonal method to address the network connectivity, coverage, and network life time problems in WSNs. Mobile sensors are useful as they can move to locations that meet sensing coverage requirements. In this paper we propose a novel sensor relocation scheme where redundant mobile nodes are moved to heal coverage holes in the network. We evaluate this work by simulations and show that our approach outperforms others in terms of relocation time and total energy consumption.
在过去的几年中,无线传感器网络在诸如灾害管理、边境保护、战场侦察和安全监视等应用中受到了更大的关注。传感器节点有望在无人值守的环境中自主运行,而且数量可能会很大。wsn不能在恶劣或恶劣的环境中手动部署。因此,无线传感器网络可以通过从空中投放而形成。然而,传感器节点的随机部署可能会在传感区域的覆盖方面留下漏洞。此外,传感器节点故障可能导致连通性丢失,在某些情况下可能导致网络分区。移动设备可以作为一种正交方法来解决无线传感器网络中的网络连通性、覆盖范围和网络寿命问题。移动传感器很有用,因为它们可以移动到满足传感覆盖要求的位置。本文提出了一种新的传感器重新定位方案,通过移动冗余的移动节点来弥补网络中的覆盖漏洞。我们通过模拟来评估这项工作,并表明我们的方法在迁移时间和总能耗方面优于其他方法。
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引用次数: 13
Using I/O Schedulers to Reduce I/O Load in Virtualization Environments 使用I/O调度器减少虚拟化环境中的I/O负载
Tsuyoshi Ota, S. Okamoto
Server virtualization helps us system and network administrators manage computer resources and reduce power consumption. However, to make efficient use of virtualization, its various loads, especially I/O operations, require careful consideration. Here we conducted three experiments to examine the effects of I/O load in a virtualization environment. First, We measured the performance of I/O operations executed on a virtual machine (VM) and the power consumption of the host machine, varying the I/O schedulers on both machines. The results varied according to the combinations of the I/O schedulers. Four of the 16 combinations in particular showed low I/O performance and high power consumption. We then investigated the effect of I/O priority to VM processes with a completely fair queuing scheduler on I/O performance. In this case, the I/O execution of high-priority required less than half the time of that of a lower priority process. Finally, we investigated the effects of I/O priority while jointly varying the block size of I/O requests issued by the VMs. I/O execution was effective when the block size was large but not when it was small.
服务器虚拟化帮助系统和网络管理员管理计算机资源,降低功耗。但是,为了有效地利用虚拟化,需要仔细考虑它的各种负载,特别是I/O操作。在这里,我们进行了三个实验来检查虚拟化环境中I/O负载的影响。首先,我们测量了在虚拟机(VM)上执行的I/O操作的性能和主机的功耗,并改变了两台机器上的I/O调度器。结果根据I/O调度器的组合而有所不同。在16种组合中,有4种表现出较低的I/O性能和较高的功耗。然后,我们研究了具有完全公平队列调度程序的VM进程的I/O优先级对I/O性能的影响。在这种情况下,高优先级进程的I/O执行所需的时间不到低优先级进程的一半。最后,我们研究了在共同改变虚拟机发出的I/O请求的块大小时I/O优先级的影响。当块大小较大时,I/O执行是有效的,但当块大小较小时则不然。
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引用次数: 4
Extension of Proxy Mobile IPv6 with Bicasting for Support of Multi-homing and Mobility in Wireless Networks 支持无线网络多归属和移动性的双播代理移动IPv6扩展
J. Kim, S. Koh
This paper proposes an extension of Proxy Mobile IPv6 (PMIPv6) with bicasting for multi-homing and mobility support. In the proposed scheme, the Local Mobility Anchor (LMA) extends its Binding Cache Entry (BCE) for support of multiple bindings, and a mobile node (MN) performs the binding update to LMA. To support the handover, the LMA begins the bicasting of data packets to the New-Mobile Access Gateway (N-MAG) as well as Previous-Mobile Access Gateway (P-MAG). The proposed scheme is compared with the existing PMIPv6 handover by ns-2 simulations. From the numerical analysis, we can see that the proposed scheme can reduce the possible packet losses and handover latency, compared to the existing scheme, during handover in the multi-homing environment.
本文提出了一种扩展的代理移动IPv6 (PMIPv6)与bicasting多归属和移动支持。在该方案中,本地移动锚(LMA)扩展其绑定缓存项(BCE)以支持多个绑定,移动节点(MN)执行对LMA的绑定更新。为了支持切换,LMA开始将数据包广播到新移动接入网关(N-MAG)和旧移动接入网关(P-MAG)。通过ns-2仿真,将该方案与现有的PMIPv6切换方案进行了比较。从数值分析中可以看出,在多归属环境下,与现有方案相比,本文提出的方案可以减少切换过程中可能出现的丢包和切换延迟。
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引用次数: 6
Enhanced CAC with QoS Scheme for Improving the Efficiency of Resource Allocation on the IEEE 802.16 Network 提高IEEE 802.16网络资源分配效率的增强CAC和QoS方案
Shin-Jer Yang, Chun-Hsiu Cheng, Rei-Yao Wu
Five service types with different priorities are defined to meet the QoS needs for different users, there are UGS, ertPS, rtPS, nrtPS, and BE on the IEEE 802.16 network. First, SS has to send connection request to BS before it is ready to transmit data. Then, SS can be allowed to transmit data white holding the allocated bandwidth from BS. Actually, BS utilizes CAC to identify whether enough bandwidth to serve the new connection requests from SS or not. When the numbers of SS are increasing, the more requests in bandwidth are higher. However, the CAC is to allocate bandwidth in sequence, it may not satisfy the QoS demand. Based on conventional CAC, we propose an enhanced CAC with QoS scheme, called ECQ, to support efficient bandwidth allocation for connection requests of different service types on the IEEE 802.16 PMP mode. Hence, we use QualNet tool to perform some experiments, simulation results indicate that the proposed ECQ scheme can obtain lower CBP about 17.1% and higher Packet Arrival Ratio and Total Packets Received about 19.16% and 29.2% than CAC. Finally, the goals of proposed ECQ are to fix the CAC issue that resource is hold by a specified service type and to achieve better performance on the IEEE 802.16 network.
为了满足不同用户的QoS需求,IEEE 802.16网络定义了5种不同优先级的业务类型,分别是UGS、ertPS、rtPS、nrtPS和BE。首先,SS必须在准备好传输数据之前向BS发送连接请求。然后,SS可以在保持从BS分配的带宽的情况下传输数据。实际上,BS利用CAC来确定是否有足够的带宽来服务来自SS的新连接请求。当SS数量增加时,带宽上的请求越多越高。但是,CAC是按顺序分配带宽的,它可能不能满足QoS需求。为了在IEEE 802.16 PMP模式下对不同业务类型的连接请求进行有效的带宽分配,在传统CAC的基础上,提出了一种具有QoS的增强CAC方案——ECQ。因此,我们使用QualNet工具进行了一些实验,仿真结果表明,与CAC相比,所提出的ECQ方案可以获得更低的CBP约17.1%,更高的数据包到达率和总数据包接收率分别约19.16%和29.2%。最后,建议的ECQ的目标是解决CAC问题,即资源由指定的服务类型持有,并在IEEE 802.16网络上实现更好的性能。
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引用次数: 6
An Intelligent Scan Mechanism for 802.11 Networks by Using Media Independent Information Server (MIIS) 基于媒体独立信息服务器的802.11网络智能扫描机制
Muhammad Qasim Khan, S. Andresen
Handover efficiency in wireless and mobile communication networks is an important factor in providing QoS guarantees for real time applications. The 802.11 standard requires a Mobile Node (MN) to scan all the possible channels (11 in the US) to discover available Access Points (AP’s) during a handover. In a given 802.11 cell several channels are expected to be empty. Due to a full scan the MN ends up wasting time scanning empty channels, which results in a high handover delay. This handover delay can be reduced by simple refining the scanning procedure to a limited set of channels, currently being used throughout the network or by the surrounding access points. In this paper we propose to use the Media Independent Information Server (MIIS) to inform the MN of the channel configuration information of the network or the surrounding AP’s. In our scheme the MN acquires channel configuration information from MIIS server and then uses that information to scan a limited set of channels being used by the surrounding access points or through out the network rather than scanning all possible channels resulting in reduced handover delay. We define a parameter NET_CHANNEL_CONFIG which is passed in the query by the MN to the MIIS, so that the MIIS knows which information is being requested by the MN. We also define an Information Element Container IE_CONTAINER_802.11_CHINFO which is used by MIIS to return the requested channel configuration information of the network to the MN. We call our scheme Intelligent Scan.
无线和移动通信网络的切换效率是为实时应用提供QoS保障的重要因素。802.11标准要求移动节点(MN)扫描所有可能的信道(在美国是11个),以便在切换期间发现可用的接入点(AP)。在给定的802.11小区中,预期有几个信道是空的。由于完全扫描,MN最终浪费时间扫描空通道,这导致高切换延迟。这种切换延迟可以通过简单地将扫描过程细化到一组有限的通道来减少,这些通道目前在整个网络中或由周围的接入点使用。在本文中,我们建议使用媒体独立信息服务器(MIIS)来通知MN网络或周围AP的信道配置信息。在我们的方案中,MN从MIIS服务器获取信道配置信息,然后使用该信息扫描周围接入点或整个网络使用的一组有限的信道,而不是扫描所有可能的信道,从而减少切换延迟。我们定义了一个参数NET_CHANNEL_CONFIG,它由MN在查询中传递给MIIS,这样MIIS就知道MN请求了哪些信息。我们还定义了一个信息元素容器IE_CONTAINER_802.11_CHINFO, MIIS使用它将请求的网络通道配置信息返回给MN。我们称我们的方案为智能扫描。
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引用次数: 12
Application to the Disaster Data of an Idea Generation Consistent Support System 思想生成一致支持系统在灾害数据中的应用
Toshihiro Ajiki, H. Fukuda, Tomohiro Kokogawa, Junko Itou, J. Munemori
We have developed an image editing application, Quiccamera and an idea generation consistent support system, GUNGEN-SPIRAL II. Quiccamera was created for the idea collection part of GUNGEN-SPIRAL II. Quiccamera can upload data briefly. GUNGEN-SPIRAL II is a Web-based system, which can support shared ideas and the circulation of information for an idea generation method, the KJ method. We applied these two systems to disaster data. From the results of the experiment, we found that we could easily upload ideas using handwriting and a pictograph stamp for photographs with Quiccamera. The evaluation of the pictograph stamp in particular was high. The correspondence of anti-disaster measures created by GUNGEN-SPIRAL II was found to be sufficient.
我们开发了一个图像编辑应用程序,quickcamera和一个想法生成一致的支持系统,GUNGEN-SPIRAL II。quickcamera是为GUNGEN-SPIRAL II的创意收集部分创建的。quickcamera可以简单上传数据。GUNGEN-SPIRAL II是一个基于web的系统,它可以支持一种想法生成方法(KJ方法)的共享想法和信息流通。我们将这两个系统应用于灾难数据。从实验结果来看,我们发现我们可以很容易地使用手写和Quiccamera照片的象形文字印章上传想法。对象形文字邮票的评价尤其高。发现GUNGEN-SPIRAL II所创造的抗灾措施的对应性是足够的。
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引用次数: 3
Evaluation of Gigabit Ethernet Local Area Networks in Windows Vista-Server 2008 Environment Windows Vista-Server 2008环境下千兆以太网局域网的评估
S. S. Kolahi, Burjiz K. Soorty
In this paper, the performance of Gigabit Ethernet is evaluated using Windows Vista and Windows Server 2008 as operating systems. Maximum bandwidth achieved for Gigabit Ethernet was approximately 700Mbps that is much lower than the theoretical limit of 1000Mbps.
本文以Windows Vista和Windows Server 2008为操作系统,对千兆以太网的性能进行了评估。千兆以太网实现的最大带宽约为700Mbps,远低于1000Mbps的理论限制。
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引用次数: 4
期刊
2011 IEEE Workshops of International Conference on Advanced Information Networking and Applications
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