Telecooperation means to fulfil different tasks within distributed (study-) groups with the help of multimedia communication services and systems, so-called telecooperation systems (Tcoop system). The immense progress...
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Telecooperation means to fulfil different tasks within distributed (study-) groups with the help of multimedia communication services and systems, so-called telecooperation systems (Tcoop system). The immense progress in the underlying information and telecommunication technology increases the functionality, variability, and complexity of such Tcoop systems. In addition there is a great demand for Tcoop systems individually tailored to the customer's need in an increasingly competitive market. Provider of telecommunication services traditionally have used computer-based support systems to fulfil parts of this task. However, up to now advantage has seldom been taken of a model-based approach to this problem which could help to cover the whole process. This paper is concerned with the concepts, the architecture, the representation, and the semantics of a reference model used for this purpose and shows how the configuration of the Tcoop system can be based on that.
In a multimedia news on demand application, the delivery of multiple streams of data over a network will introduce inevitable delays and delay variations that disrupt both inter- and intra-media synchronization. There...
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In a multimedia news on demand application, the delivery of multiple streams of data over a network will introduce inevitable delays and delay variations that disrupt both inter- and intra-media synchronization. Therefore, a complete stream synchronization protocol must be specified and tested to ensure proper rendering of the multimedia presentation at the client. In such a protocol, special treatment should be considered for time dependent coded data streams due to the presence of a hardware/software decoding entity at the client. We propose a client based control scheme using buffer occupancy as its main parameter. The control scheme uses time contraction and expansion concepts to: avoid data overflow or underflow conditions; and enforce intra-media synchrony of the data stream. We refer to such a control mechanism as the predecoder synchronization controller. We consider both motion JPEG and MPEG video bit streams and discuss the implementation and architectural constraints encountered.
The paper addresses compunication technology as well as our effort in this area. Compunication is a novel growing area which basically is a baby made from computing and communication technologies. Compunication techno...
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The paper addresses compunication technology as well as our effort in this area. Compunication is a novel growing area which basically is a baby made from computing and communication technologies. Compunication technology is driven by the applications and information industry. Compunication is not a simple integration between computing and communication. The marriage will bring cheap/fast communication and powerful multimediacomputing, networking abilities to us in a single device.
This paper discusses emerging directions of enterprise networks (ENs). Technological, policy-related, and architectural viewpoints are used to discuss the evolution of the ENs. Various phases of life-cycle of the ENs ...
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This paper discusses emerging directions of enterprise networks (ENs). Technological, policy-related, and architectural viewpoints are used to discuss the evolution of the ENs. Various phases of life-cycle of the ENs are then reviewed. An integrated, reliable, high bandwidth, scalable and multimedia transport net based architecture is envisioned for next generation ENs (NGENs). The users of NGENs would have more direct control over the configuration and quality of service they subscribe to.
Although the bandwidth of the storage I/O typically dictates the performance of a conventional DBMS, network-I/O bandwidth limitation is the main operating constraint of most multimedia database systems. In spite of t...
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Although the bandwidth of the storage I/O typically dictates the performance of a conventional DBMS, network-I/O bandwidth limitation is the main operating constraint of most multimedia database systems. In spite of the fact that the throughput of a public network (e.g. ATM) can be huge, the network-I/O bottleneck limits the number of client stations a media server can support simultaneously. A possible solution to this problem is to batch requests for the same video and multicast the data to these requesters to save the network I/O bandwidth. A disadvantage of this scheme is that it unfairly forces requests arriving early in a batch to wait for the latecomers. As a result, the reneging rate can be high in a system which employs this technique. To reduce the long access latency, we examine in this paper a new batching mechanism called chaining. This approach allows the server to serve a "chain" of client stations using a single data stream. The idea is to pipeline the data stream through the chain of stations. Requests arriving early in a chain (virtual batch), therefore, do not have to experience long delays as in conventional batching. Our simulation results based on an ATM networking environment indicate that very significant performance improvement over batching can be obtained.
We propose a scalable service networking architecture as a TINA-like environment for providing various mobility services. The proposed architecture provides an environment that enables the advent of service providers ...
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We propose a scalable service networking architecture as a TINA-like environment for providing various mobility services. The proposed architecture provides an environment that enables the advent of service providers and rapidly introduces multimedia applications, considering network scalability. For supporting customized mobility services, this architecture adopts a new service component, which we call Omnipresent Personal Environment Manager (OpeMgr). In order to support mobile users who move between heterogeneous networks, for instance, between the TINA-like environment and the Internet environment, we propose a structure of a gateway. In addition, the proposed architecture uses the fixed and mobile agent approaches for supporting the user's mobility and we evaluated their performance comparing those approaches.
Describes the usage of a distributed processing environment (DPE) based on CORBA 2 with respect to distribution transparencies. We sketch a multimedia telecommunication service-T-MMCS (TINA multimedia Conferencing Sys...
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Describes the usage of a distributed processing environment (DPE) based on CORBA 2 with respect to distribution transparencies. We sketch a multimedia telecommunication service-T-MMCS (TINA multimedia Conferencing System)-based on the TINA-C (Telecommunication Information networking Architecture Consortium) concepts and our experience with using CORBA 2 implementations-Orbix and Hewlett-Packard Distributed Smalltalk (HPDST)-as DPEs for this application. At the moment, the CORBA scene is changing very rapidly. New products are arising and interoperability between products is increasing due to corrections in the implementations. More and more CORBA services are supported. The CORBA standards are also being extended and more services are being defined. These changes are happening rapidly. Therefore, we present the newest developments that have taken place and our newest experiences.
multimedia interfaces are rapidly evolving to facilitate human/machine communication. Most of the technologies on which they are based are, as yet, imperfect. But, the interfaces do begin to allow information exchange...
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multimedia interfaces are rapidly evolving to facilitate human/machine communication. Most of the technologies on which they are based are, as yet, imperfect. But, the interfaces do begin to allow information exchange in ways familiar and comfortable to the human-principally through natural actions in the sensory dimensions of sight, sound and touch. Further, as digital networking becomes ubiquitous, the opportunity grows for collaborative work through conferenced computing. In this context the machine takes on the role of mediator in human/machine/human communication-the ideal being to extend the intellectual abilities of humans through access to distributed information resources and collective decision making. The challenge is how to design machine mediation so that it extends, not impedes, human abilities. This report describes evolving work to incorporate multimodal interfaces into a networked system for collaborative distributed computing. It also addresses strategies for quantifying the synergies that may be gained.
In this paper, we identify the service interworking scenarios and architecture to provide a virtual server in heterogeneous network environment. The middleMEN is proposed to be an effective architecture for service in...
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ISBN:
(纸本)0780339053
In this paper, we identify the service interworking scenarios and architecture to provide a virtual server in heterogeneous network environment. The middleMEN is proposed to be an effective architecture for service interworking of some sophisticated multimedia application. We also present main technique developed to achieve this architecture. To realize the proposed service concept, we implement the video caching acts as a proxy server for real time video service.
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