Nowadays, we have witnessed the widely recognized phenomenon of high speed data streams. Various statistics computation over data streams is often required by many applications, including processing of relational type queries, data mining and high speed network management. In this paper, we provide survey for three important kinds of aggregate computations over data streams: frequency moment, f...

We describe an audio-service for collaborative network applications, designed to support many simultaneous audio sources and to operate across the Internet. Our service introduces and exploits a new technique called distributed partial mixing to dynamically adapt to varying numbers of speakers and network congestion. A collection of networked partial audio mixers is arranged as a distributed gr...

With the increasing popularity of MBone conferences, the need arose to archive the multimedia streams of these conferences. Like all network applications, a conference recorder is subject to packet loss, which introduces gaps into recorded media streams. Such gaps degrade the playback quality of an archived media stream or even disable the correct playback. In this paper, we present a novel sch...

The paper focuses on temporal synchronization of various data streams in multimedia information (e.g., voice, video, graphics and text) exchanged between user entities distributed over a network. During delivery of such data at users for processing (i.e., data play-out), maintaining the required temporal association between points in the data across various streams is necessary in the presence ...

A recent approach in Internet congestion control suggests collaboration between sets of streams that should share network resources and learn from each other about the state of the network. Currently such a set of collaborating streams a macro ow is organized on host pair basis. We propose in this paper a new method for grouping streams into macro ows when they behave similarly. A ow behavior i...

There are many reasons for quality degradation of multimedia streams inside the network. Two of the most important ones are related to the UDP protocol and the Random-Drop policy implemented inside most of the routers currently deployed on the Internet. We intend to discuss, in this paper, some of multimedia streaming applications’ problems centered around the UDP protocol and Random-Drop polic...

The transport of multimedia streams in computer communication networks raises issues at all layers of the OSI model. At the physical layer, the main issue is one of providing the appropriate bandwidth at all levels of the network infrastructure, from the local area network to the campus and wide-area backbones. The data link layer must provide support for priorities to di erentiate the various ...

Rate adaptive multimedia streams offer significant system and client benefits over non-adaptive streams. These benefits come at the price of increased complexity in providing adequate network support and difficulty in understanding how rate adaptation protocols affect client perceived QoS. In this paper we define quality of service in terms of the mean rate seen by the client. We identify an in...

An Intrusion Detection System (IDS) is a piece of software and/or hardware designed to detect unwanted attempts at accessing, manipulating, and disabling of computer systems, through a network such as the Internet. Network-based Intrusion Detection Systems (NIDS) try to detect malicious activities by monitoring network traffic. Research on network traffic measurement has identified various patt...