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Applications and the Internet, 2007. SAINT 2007. International Symposium on

Date 15-19 Jan. 2007

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Displaying Results 1 - 25 of 28
  • 2007 International Symposium on Applications and the Internet - Cover

    Page(s): c1
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  • 2007 International Symposium on Applications and the Internet-Title

    Page(s): i
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  • 2007 International Symposium on Applications and the Internet-Copyright

    Page(s): iv
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  • 2007 International Symposium on Applications and the Internet - TOC

    Page(s): v - vii
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  • Message from the General Chairs

    Page(s): viii
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  • Welcome from PC Chairs

    Page(s): ix
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  • Organizing Committee

    Page(s): x
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  • Program Committee

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  • Steering Committee

    Page(s): xii
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  • Live E! Project; Sensing the Earth with Internet Weather Stations

    Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6370 KB) |  | HTML iconHTML  

    The Live E! project, www.live-e.org, is an open research consortium among industry and academia to explore the platform to share the digital information related with the Earth and our living environment. We have getting a lot of low cost sensor nodes with Internet connectivity. The deployment of broadband and ubiquitous networks will enable autonomous and global digital information sharing over the globe. In this paper, we describe the technical and operational overview of Live E! project, while discussing the objective, such as education, disaster protection/reduction/recovery or business cases, and goal of this project activity View full abstract»

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  • Disaster Evacuation Guide: Using a Massively Multiagent Server and GPS Mobile Phones

    Page(s): 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1490 KB) |  | HTML iconHTML  

    The ubiquitous environment enables us to build systems that provide individual users with personalized navigation services in cities. In developing such a system, it is necessary to estimate the influence and the movement of its users and to get feedback. However, it is difficult to perform tests on such a system given the large number of human subjects involved and its scale, which matches that of a major city. One possible solution is proposed herein, the augmented experiment; it combines a multiagent simulation with a small-scale experiment performed with human subjects. In the experiment, the movements of agents that simulate users are shown to human subjects in order to give them the impression that the environment is populated with a large number of users. In this research, we build an evacuation guide system based on GPS-capable cellular phones and perform an augmented experiment wherein human subjects and evacuee agents are directed while the status of the simulation is passed to the human subjects. Interviews of the human subjects confirmed that the augmented experiment successfully gave the impression that a large number of users were present View full abstract»

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  • Internet Technologies and Infrastructure for Asia-Wide Distance Education

    Page(s): 3
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    SOI Asia project aims at Asia-wide distance education development with its design emphasizing on new model of network technologies that provides wide-coverage high-quality network to support high-quality distance education instead of relying on the available Internet connectivity with inadequate quality. A 13-Mbps unidirectional broadcast satellite covers Asia region enabling lecture sharing among student sites. IPv6 multicast overlay network is established by UDLR and IPv6 tunnel technologies to create a virtual network connecting lecturer-site and student-sites on top of network heterogeneity. Bandwidth optimization and scalability are achieved by IPv6 multicast. QoS using policy routing and ALTQ utilizes and manages bandwidth to ensure high quality lectures. Experiment results show that SOI Asia environment delivers better quality streams with stable rate, high correlation, low data loss and jitter compared to the available Internet connectivity. These design aspects, technology model and experimental results can be the considerations of future region-wide distance education development View full abstract»

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  • Reactivity-Based Quality of Service Strategies for Web Applications

    Page(s): 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    The great success of the Internet has raised new challenges in terms of applications and user satisfaction. Web applications demand requirements, such as performance and scalability, in order to guarantee quality of service (QoS) to users. Due to these requirements, QoS has become a special topic of interest and many mechanisms to provide it have been proposed. Those mechanisms fail to consider aspects related to reactivity, i.e., how the users react to variable server response time. This work addresses the use of reactivity to provide new strategies. We design and evaluate a reactivity-based scheduling mechanism that gives priority according to user behavior. We also propose a hybrid admission control and scheduling mechanism that combines both reactive approaches. The results show benefits in terms of response time and user satisfaction View full abstract»

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  • High Availability and Scalability Support for Web Applications

    Page(s): 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (270 KB) |  | HTML iconHTML  

    A database query caching technique, GlobeCBC, can be used to improve the scalability of Web applications. This paper addresses the availability issues in GlobeCBC. Even though high availability is achieved by adding more resources, proper algorithms must be designed to ensure that the clients receive consistent responses amidst failures of the edge and origin servers. We present lightweight algorithms to detect and correct server failures while providing read-your-writes consistency. They exploit the fact that the query workload of Web applications is based on a fixed set of read and write templates. We show that these algorithms incur very low overhead using several microbenchmarks and a complete Web application benchmark View full abstract»

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  • Parallel Loop Scheduling Using Knowledge-Based Workload Estimation on Grid Environments

    Page(s): 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (497 KB) |  | HTML iconHTML  

    Parallel loop scheduling on grid environments is a challenging problem, especially for loops with irregular workload distribution. In the past, this problem of load imbalance resulting from irregular workload was not explicitly addressed. This paper proposes a new approach to schedule loop iterations with irregular workload on grid environments. Based on knowledge-based estimation of workload, the proposed method can dispatch an appropriate proportion of workload to each node for execution according to its performance. In addition, the scheduler uses historical statistics of CPU usage and network bandwidth to estimate the dynamically changing performance of each node. Two applications, regular type and irregular one respectively, are implemented and executed on a grid test-bed, which consists of four schools. Experimental results show that the new approach improves the performance on previous schemes View full abstract»

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  • A Component Framework for Document-Centric Network Processing

    Page(s): 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1456 KB) |  | HTML iconHTML  

    A component framework for defining content-based network processing is presented. It is unique among other existing approaches because it enables contents to naturally define their own processing and end-users to easily define network processing. By using it, we can dynamically make an enriched document as a nested composition of software components corresponding to various content, e.g., text, images, and windows. It enables each component or document to migrate over a network under its own control by using mobile agent technology. Moreover, it introduces components as carriers or forwarders because it enables them to carry or transmit other components as first class objects to other locations. It offers several basic operations for network processing, e.g., forwarding, duplication, and synchronization. It allows end-users to easily define their own content-based or application-specific network processing by assembling these components in through GUI manipulations. This paper describes the framework and its implementation, which currently uses Java as the implementation language as well as a component development language, and then illustrates several interesting applications that demonstrate its utility and flexibility View full abstract»

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  • Development of System for the Automatic Generation of Unknown Virus Extermination Software

    Page(s): 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    In recent years, there has been a frequent occurrence of virus-related incidents, including cases where a virus infection has caused the unauthorized release of confidential information. Viruses should be considered a society-level security risk. However, the mainstream approach to addressing a virus is basically to implement countermeasures for the virus after the damage has occurred. Some of these countermeasures are unable to keep up with the current pace at which viruses are occurring. To address this problem, in this research, we developed a system to generate unknown virus extermination software automatically, without any manual operations. The developed system is designed to automatically generate software that detects and exterminates an unknown virus, by using both a dynamic heuristic that uses a virtual PC and a technique to automatically generate a signature from header data in the virus executable. We were able to verify the effectiveness of this system when we conducted experiments to check whether or not an actual virus could be exterminated by a vaccine that was automatically created for the virus with the developed system View full abstract»

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  • uEyes: A Ubiquitous Care-Support Service Based on Multiple Contexts Coordination

    Page(s): 9
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (808 KB) |  | HTML iconHTML  

    In this paper we propose a gentle system for watching over for ubiquitous care-support services that fulfill users' actual requirements. In traditional systems of this domain, only the location information of a user on "one" side of the watching site or the watched site is considered. In this work, we cope not only with the user's location but also all the detailed situations (contexts) of associated entities such as devices, software, networks, and users, in "both" sides. To do this, we propose a ubiquitous watching over system "uEyes". In uEyes, autonomous decision making ability and cooperative behavior are introduced to each entity. Based on the advanced feature of the entities, live video streaming system is dynamically constructed according to the contexts of the entities, on both sides in runtime. As a result, watching over service that fulfills detailed users' requirements can be effectively provided. We implemented a prototype of uEyes for watching over elderly people, and performed some experiments based on several scenarios. For instance, we assumed a scenario that a son, who is taking care of his ailing father, wanted to see his facial color and expression in high quality video. We confirmed that the live video streaming system involving high resolution camera and display devices is dynamically configured in run-time View full abstract»

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  • TCP-friendly Congestion Control for HighSpeed Network

    Page(s): 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    The currently used TCP congestion control, TCP Reno, has two weaknesses. To solve this TCP Reno drawback, highspeed TCP and scalable TCP were proposed. However, the fairness between these proposed TCP and TCP Reno is not considered, when both connections coexist. Secondly, TCP Reno connections share bandwidth unfairly, when TCP flows with different RTTs use the same link. Many researches have been proposed to solve this issue. However, no single method has been proposed to solve both issues. This paper proposes a new TCP congestion control algorithm, which is based on the generalized additive increase multiplicative decrease (AIMD) rules. Our algorithm (1) sends packets efficiently in high-speed networks, (2) is TCP-friendly with TCP Reno and (3) shares fair bandwidth between flows with different RTTs. We evaluate the capabilities of our proposal by computer simulations and compare it with existing TCP View full abstract»

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  • SPRED: Active Queue Management Mechanism for Wide-Area Networks

    Page(s): 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    AQM (active queue management) mechanism is a congestion control mechanism at a router for controlling the number of packets in the router's buffer by actively discarding an arriving packet. AQM mechanism can shorter the average delays in the router's buffer and can also achieve high throughput. RED (random early detection) is a representative AQM mechanism, which probabilistically discards an arriving packet. However, it is reported that the performance of RED degrades in a wide-area network with a large propagation delay. In this paper, we therefore propose an AQM mechanism called SPRED (Smith Predictor for random early detection) for wide-area networks. The notable feature of SPRED is realizing high steady-state and transient-state performance by using a delay compensator called Smith Predictor for compensating a large feedback delay. In this paper, we show the effectiveness of SPRED by both analysis and simulation experiments View full abstract»

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  • On the Effect of Scale-Free Structure of Network Topology on End-to-End Performance

    Page(s): 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (137 KB) |  | HTML iconHTML  

    In recent years, it has been reported that several existing networks including the Internet have scale-free structure. In this paper, through a simple numerical analysis, we investigate effect of the scale-free structure of communication networks on their end-to-end performance. As network topologies, a random network and a scale-free network with the equal number of nodes and the equal number of links are used. We compare end-to-end performance of flows (i.e., throughput) in both random and scale-free networks. Consequently, we show that when the average degree of a network is small (i.e., when the number of links is small), a scale-free network shows better end-to-end performance. On the contrary, when the average degree of a network is large (i.e., when the number of links is large), we show that a random network shows better end-to-end performance View full abstract»

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  • A Userland Network Emulator with Packet Capture and Replay

    Page(s): 13
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (940 KB) |  | HTML iconHTML  

    Testing of communication protocols and applications using simulated networks is necessary. In this paper, we show the development of a network emulator called as "Lenet". Since our objective is to provide a network emulator as a user can use it more convenient, Lenet is developed as a userland application which is typically used by end users. Even though a userland application, Lenet has similar functions and accuracy to the existing software emulators of an in-kernel implementation type. Lenet gives two kinds of emulation. One is by parameters to simulate specific network conditions for an end-to-end. Another type of emulation is to replay the behavior of a real network using a replay scenario created by packet capture or written by a user. We present some evaluation results of Lenet on performance and convenience View full abstract»

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  • Analysis for Topological Properties of the Network Feeding Usenet News

    Page(s): 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (677 KB) |  | HTML iconHTML  

    Recently, many studies have reported that various kinds of real networks, such as WWW, the Internet, metabolic system, BtoB transactions and so on, have the scale-free properties in common. We focus on the network feeding Usenet news where a node represents a news server and a link between two nodes represents a connection on which the two news servers exchange their articles. First we generate the whole topology map approximately from path information of a number of Usenet news articles. Then we examine topological properties of the network; degree distribution, degree correlation, average distance, clustering coefficient and community structures. We also compare these properties with those of theoretical network models. The analysis shows that there strongly exist a scale-free and a small-world properties in the Usenet network. We also examine the community structure of this network and show that a small number of Usenet news servers that are highly contributive for article feeds forms the largest community and other servers tend to be categorized by their geographical locations View full abstract»

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  • Benchmarking XML Based Application Oriented Network Infrastructure and Services

    Page(s): 15
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    Common application infrastructure services are shifting from back-end hosts to the network edges. Cisco Systems application oriented networking (AON) initiative is an example of this emerging trend. Benchmarking such infrastructure and services is expected to play an important role in the networking industry. We present AONBench specifications and methodology to benchmark networked XML application servers and appliances. AONBench is not a benchmarking tool. It is a specification and methodology for performance measurements, which leverages from existing XML microbenchmarks and uses HTTP for end-to-end communication. We implement AONBench specifications for end-to-end performance measurements through public domain HTTP load generation tool ApacheBench and Apache Web server. We present three case studies of using AONBench for architecting real application oriented networking products View full abstract»

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  • Performance Enhancement of Header Compression over Asymmetric Wireless Links Based on the Objective Speech Quality Measurement

    Page(s): 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB) |  | HTML iconHTML  

    A variety of conversational multimedia services have been developed and provided for a FMC (fixed mobile convergence) environment, which contains a variety of wireless networks, such as 1x EV-DO (1x EVolution Data Only), WiMAX (worldwide interoperability for microwave access), WiFi (wireless fidelity) and combinations. The bandwidths of several wireless networks are asymmetric and restricted. For example, for the asymmetric link, 1x EV-DO specifies the peak rates for downlink and uplink as 2.4 Mbit/s and 153 Kbit/s. A header compression scheme for the transmitted packets of conversational multimedia signals is an effective solution for these scarce links, especially in the IPv6 environment. However, ways to improve the performance of the header compression scheme have not been thoroughly evaluated quantitatively considering the quality of conversational multimedia services over the asymmetric wireless links where the transmission characteristics of the up and down links are quite different. This paper presents the results of a study that examined ways to improve the performance of the header compression scheme based on control of the header compression parameters considering speech quality over the asymmetric wireless link. The paper also presents experimental verifications of the efficiency of our proposal using a practical implementation View full abstract»

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