In a heterogeneous network, layered multicast is useful which enables receivers to determine the rate of a stream adaptively to their various capacities. Previous rate control schemes for layered multicast, however, treat each stream independently and cannot allocate the requested bandwidth to each stream when receivers subscribe to multiple streams. In this paper, we propose an inter-stream ra...

Achieving statistical gains when multiplexing video streams, as in a video-on-demand (VOD) scenario, is difficult because of the stringent QOS demands and the selfsimilar nature of the traffic. This paper explores, through empirical simulation, the QOS, network utilization, and statistical characteristics of the aggregate traffic resulting from multiple independent MPEG video streams. In additi...

This paper describes a new mechanism to garantee quality of service for multimedia streams in low-cost home networks. Quality of service is based on a token, of which the route in the network is determined by a distributed scheduler. The network node that has the token –the active node– can send its data during a predetermined period. The length of this period and which node gets the token next...

We present the Preemptive Bandwidth Allocation Multicast Protocol; a distributed multicast QoS-aware signaling protocol that adapts the users’ bandwidth requirements to the limited resources available in the network by preempting bandwidth of less prioritized streams from existing multicast groups. We assume that each multicast group will have different multicast streams with predefined quality...

We propose a new scheme for authenticating streamed data delivered in real-time over an insecure network. The difficulty of signing live streams is twofold. First, authentication must be efficient so the stream can be processed without delay. Secondly, authentication must be possible even if some packets in the sequence are missing. Streams of audio or video provide a good example. They must be...

The Homogeneous Multiprocessor (HM) has a linear-array topology, with interprocessor communications achieved by the sharing of memory between nearest neighbours, by adjacent-processor signalling, and through a high-speed network (the H-Network). The operating system nucleus (the HM-Nucleus) for the HM contains a communications subsystem that provides low-overhead communications, both for user p...

In this paper, we describe a new Telepresence system which enables a user to look around a virtualized real world easily in network environments. The proposed system includes omni-directional video viewers on web browsers and allows the user to look around the omni-directional video contents on the web browsers. The omni-directional video viewer is implemented as an Active-X program so that the...

Social networking sites are typically monetized via side payments, buy-clubs and affiliate programs, access controls, aggregation of content and integrated mobile platforms. However, there are other often untapped ways to create value through social networks, especially those related to enhanced interaction with customers, and knowledge creation and dissemination within organizations. In this a...

In this paper we study the perceptual impact of data loss on MPEG-2 video coded streams transmitted over an ATM network. This impact is measured using a perceptual qualitymetric based on a spatio-temporal model of the human visual system. Video streams have been transmitted on top of both new network and ATM adaptation layers which provide a robust transmission by applying per-cell sequence num...