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A QoS-aware multicast overlay spanning tree protocol for multimedia applications in MANETs

A QoS-aware multicast overlay spanning tree protocol for mul...

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international Telecommunication Networking workshop on QoS in Multiservice IP Networks, IT-NEWS

作者： Hakim Badis LABINFO-IGM UMR CNRS 8049 Université Paris-Est France

Many real-time applications, such as video conferencing, require the transmission of flows from a sender to multiple receivers subject to Quality of Service (QoS) delivery constraints (e.g. bounded delay). Traditional multicast routing algorithms used for solving the Sterner tree problem cannot be used in this scenario, because QoS constraints on links are not considered. Moreover, with QoS metrics consideration, the problem of computing optimal constrained multicast tree is known as NP-complete. In this paper, we propose a new QoS-aware Multicast Overlay Spanning Tree (QMOST) protocol to support multiple-metric routing criteria in mobile ad hoc networks. It computes low cost trees with multiple-metric bounded paths in polynomial time using an efficient source- based optimization heuristic. Unlike common multicast protocols where data packets are transmitted in a broadcast mode, in QMOST data packets are encapsulated in unicast packets before being forwarded to the overlay tunnels. Multicasting is achieved when each node forwards multicast packets to its successors in the overlay tree. QMOST must be used in conjunction with a unicast QoS link state protocol (QOLSR) and can be integrated in a QoS model. This later offers the needed service guarantee using distributed admission control to check if the multicast QoS flows are admissible, resource reservation mechanism and congestion control. simulation results show that our QMOST protocol achieves better performance than the QOLSR protocol.

关键词： Multicast protocols Quality of service Unicast Videoconference Delay Multicast algorithms Routing protocols Mobile ad hoc networks Cost function Polynomials

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Adaptive support of range queries via push-pull algorithms 07

Adaptive support of range queries via push-pull algorithms

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21st international workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Minson, Rob Theodoropoulos, Georgios Univ Birmingham Sch Comp Sci Birmingham B15 2TT W Midlands England

ISBN: (纸本)9780769528984

In many real time interactive simulations the problem of interest management is that of filtering updates through application-specified range queries. This 'associative' form of memory access is often implemented more simply as a reference memory access pattern by discretising the n-Dimensional space in to 'cells'. Range queries then being mapped on to this discretised form. In this paper we leverage previous work on optimising communication in reference memory access systems to provide the same optimisation to associative memory access systems. We define possible semantics of range queries and present three designs along with an analysis of the problem in various applications domains and a discussion of the viability of our designs for each problem domain.

关键词： Associative memory Algorithm design and analysis Switches Filtering algorithms Computer science Computational modeling Computer simulation Adaptive filters Read-write memory Predictive models

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The simulation of a billiard game using a haptic interface 07

The simulation of a billiard game using a haptic interface

引用

11th IEEE international Symposium on distributed simulation and real-time applications

作者： De Paolis, Lucio Tommaso Pulimeno, Marco Aloisio, Giovanni CACT/NNL

ISBN: (纸本)9780769530116

Recently the computer entertainment technology has generated a deal of interest among researchers and developers as it is recognized as showing high promise in creating exciting new forms of human computer interaction. Performance improvements in graphics hardware and the diffusion of the low cost haptic interfaces have made it possible to visualize complex virtual environments and provided opportunities to interact with these in a more realistic way. In this paper a Virtual reality application of a game of billiard game is presented;to allow to the user an interactive and realistic interaction is provided a force feedback by means of a commercial haptic interface. To build an immersive virtual environment has been used the development environment XVR and to simulate the rigid body dynamics has been utilized the ODE library.

关键词： Haptic interfaces Virtual environment Computational modeling Human computer interaction Computer graphics Hardware Costs Visualization Virtual reality Application software

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A distributed topology control algorithm for P2P based simulations 07

A distributed topology control algorithm for P2P based simul...

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11th IEEE international Symposium on distributed simulation and real-time applications

作者： Hariri, Behnoosh Shirmohammadi, Shervin Pakravan, Mohammad Reza Sharif Univ Technol Dept Elect Engn Tehran Iran Univ Ottawa Distributed Collaborative Virtual Environment Res Ottawa ON Canada

ISBN: (纸本)9780769530116

Although collaborative distributed simulations and virtual environments (VE) have been an active area of research in the post few years, they have recently gained even more attention due to the emergence of online gaming, emergency simulation and planning systems, and disaster management applications. Such environments combine graphics, haptics, animations and networking to create interactive multimodal worlds that allows participants to collaborate in real-time. Massively Multiplayer Online Gaming (MMOG), perhaps the most widely deployed practical application of distributed virtual environments, allows players to act together concurrently in a virtual world over the Internet. IP Multicasting would be an optimal solution for the dissemination of updates among participants, but IP multicasting is not available to home users on the Internet, due to a number of technological, practical, and business reasons. In light of the lack availability of IP Multicasting on the global Internet, researchers have recently tended to shift multicasting from the networking layer to the application layer, known as Application Layer Multicasting, effectively constructing an overlay network among participants of the distributed simulation where end hosts themselves participate in the dissemination of update messages. In this paper, we propose a topology control architecture to support P2P based collaborative distributed simulations over the Internet by using ALM. We present our networking model and its rationale, theoretical proof and simulation measurements in comparison with other methods as proof of concept.

关键词： distributed control Virtual environment Delay Online Communities/Technical Collaboration IP networks Network topology Web and internet services Military standards Computational modeling Scalability

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A lightweight heuristic-based mechanism for collecting committed consistent global states in optimistic simulation 07

A lightweight heuristic-based mechanism for collecting commi...

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11th IEEE international Symposium on distributed simulation and real-time applications

作者： Cucuzzo, Diego D'Alessio, Stefano Quaglia, Francesco Romano, Paolo Univ Roma La Sapienza Dipartimento Informat & Sistemi Rome Italy

ISBN: (纸本)9780769530116

In this paper we study how to reuse checkpoints taken in an uncorrelated manner during the forward execution phase in an optimistic simulation system in order to construct global consistent snapshots which are also committed (i.e. the logical time they refer to is lower than the current GVT value). This is done by introducing a heuristic-based mechanism relying on update operations applied to local committed checkpoints of the involved logical processes so to eliminate mutual dependencies among the final achieved state values. The mechanism is lightweight since it does not require any form of (distributed) coordination to determine which are the checkpoint update operations to be performed. At the same time it is likely to reduce the amount of checkpoint update operations required to realign the consistent global state exactly to the current GVT value, taken as the reference time for the snapshot. Our proposal can support, in a performance effective manner termination detection schemes based on global predicates evaluated on a committed and consistent global snapshot, which represent an alternative as relevant as classical termination check only relying on the current GVT value. Another application concerns interactive simulation environments, where (aggregate) output information about committed and consistent snapshots needs to be frequently provided, hence requiring lightweight mechanisms for the construction of the snapshots.

关键词： Proposals Aggregates Computational modeling real time systems Discrete event simulation Context modeling Optimization methods

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distributed virtual reality in education 07

Distributed virtual reality in education

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11th IEEE international Symposium on distributed simulation and real-time applications, DS-RT 2007

作者： Kaufmann, Hannes Vienna University of Technology Interactive Media Systems Group Vienna Austria Institute of Software Technology and Interactive Systems Vienna University of Technology VR Group

ISBN: (纸本)0769530117

Educational virtual reality (VR) applications have a huge potential to support learning and teaching. A brief overview of previous educational VR applications will be followed by a summary of requirements specific to this field. In a typical collaborative classroom situation where large groups of users must be supported, as well as in distance education, robust and reliable networked environments are of primary importance. The speaker will present Construct3D, an application for geometry education that has been developed at the VR group at Vienna University of Technology throughout the past 6 years. Specific design aspects to allow distributed collaboration in Construct3D are presented. This concerns improvements of the user interface, usability and system performance including bandwidth efficiency. The results of three evaluations, some of them in co-located and distributed setups, with a total of more than 500 students in over 300 teaching lessons will be presented. © 2007 IEEE.

关键词： Virtual reality

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simulation-based performance analysis of a medical image-processing architecture

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11th international workshop on Formal Methods for Industrial Critical Systems (FMICS 2006)/5th international workshop on Parallel and distributed Methods in Verification (PDMC

作者： Cuijpers, P. J. L. Fyukov, A. V. Tech Univ Eindhoven NL-5600 MB Eindhoven Netherlands Philips Res NL-5656 AA Eindhoven Netherlands

ISBN: (纸本)9783540709510

In this paper, we show a simulation method for performance prediction of medical image processing chains, based on ***-time calculus of [9]. In particular, we focus on estimating the latency and throughput of a given image processing chain and its distribution over hardware resources. The architectural level of abstraction of the real-time calculus approach makes our method flexible, so that different design decisions can be studied using similar models. The choice for simulation rather than the usual algebraic analysis of real-time calculus equations, gives us the possibility to include a number of performance relevant implementation details in our models for which analytical estimates are not available.

关键词： Image processing

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A formal approach to RT-RTI design using real time DEVS

A formal approach to RT-RTI design using real time DEVS

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6th IEEE international workshop on Haptic, Audio and Visual Environments and Games, HAVE 2007

作者： Boukerche, Azzedine Shadid, Ahmad Ming, Zhang Paradise Research Lab. University of Ottawa Canada

ISBN: (纸本)9781424415717

High Level Architecture (HLA) is a wellknown standard for constructing and supporting large-scale and complex distributed interactive simulation systems. HLA has several key components, among which;Run-time Infrastructure (RTI) is a crucial one as a service provider engine in HLA based simulation systems. real time extension of HLA/RTI became very important due to the necessity for the HLA to support simulation components with strict time constraints while interacting with each other. In fact, there have been a lot of research and concerns with regard to designing a high performance RT-RTI. In this paper, we propose a novel RT-RTI design approach that uses real time Discrete Event System Specification (RT-DEVS) formalism to model and simulate vital experimental frames. We are presenting a case study that demonstrates the usefulness of this formal approach in predicting the key design characteristics through designated simulation experiments. The simulation experimental results show that dynamic thread pool management with our load balancing strategies formed a key in improving the performance of RT-RTI in terms of serving tasks within their deadlines. Through our proposed formal design approach, we have seen an open area in finding the optimal RT-RTI design using RT-DEVS. © 2007 IEEE.

关键词： Discrete event simulation

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CASSANDRA framework: A service oriented distributed multimedia content analysis engine

CASSANDRA framework: A service oriented distributed multimed...

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8th international workshop on Image Analysis for Multimedia interactive Services, WIAMIS 2007

作者： De Lange, Fons Nesvadba, Jan Lukkien, Johan Philips Research Eindhoven Netherlands Eindhoven University of Technology

ISBN: (纸本)076952818X

Connected Consumer Electronics (CE) devices face an exponential growth in storage, processing capabilities and connectivity bandwidth. This increased complexity calls for new software architectures that naturally admit self-organization, resource management for efficient workload distribution, and a transparent cooperation of connected CE-terminals. The interconnected nature makes advanced applications feasible such as the smart distribution of complex multimedia content analysis algorithms, resulting in automatic semantic content-awareness creation. In this paper we describe a modular, self-aware, self-organizing, real-time and distributed multimedia content analysis system. Based on a Service Oriented Architecture it is, furthermore, capable of efficiently and dynamically using the available resources in a grid-like manner. © 2007 IEEE.

关键词： Information services

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A distributed framework for scalable large-scale crowd simulation

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2nd international Conference on Virtual reality held at the HCI international 2007

作者： Lozano, Miguel Morillo, Pedro Lewis, Daniel Reiners, Dirk Cruz-Neira, Carolina Univ Valencia Dept Informat Ave Vicente Andres EstellesS-N E-46100 Valencia Spain Louisiana Immersive Techonol Entreprise Lafayette LA 70506 USA

ISBN: (纸本)9783540733348

Emerging applications in the area of Emergency Response and Disaster Management are increasingly demanding interactive capabilities to allow for the quick understanding of a critical situation, in particular in urban environments. A key component of these interactive simulations is how to recreate the behavior of a crowd in real- time while supporting individual behaviors. Crowds can often be unpredictable and present mixed behaviors such as panic or aggression, that can very rapidly change based on unexpected new elements introduced into the environment. We present preliminary research specifically oriented towards the simulation of large crowds for emergency response and rescue planning situations. Our approach uses a highly scalable architecture integrated with an efficient rendering architecture and an immersive visualization environment for interaction. In this environment, users can specify complex scenarios, "plug-in" crowd behavior algorithms, and interactively steer the simulation to analyze and evaluate multiple "what if" situations.

关键词： distributed computer systems

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