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Media Stream (media + stream)

Distribution by Scientific Domains

Information Science and Computing	50%

Selected Abstracts

A framework for the transmission of streaming media to mobile devices

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 1 2002
Kevin Curran
One interesting problem is the delay imposed upon mobile receivers when switching between wireless cells. We provide a solution to this in the form of an extension of Mobile IP's handoff algorithm. Our solution involves the exploitation of mobility prediction to predict a mobile terminal's future location based on its previous history (i.e. the last cell that it has been in) and for the media stream to be already present and cached by next cells base station ready for receiving by the mobile device. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Emerging uses of SIP in service provider networks

BELL LABS TECHNICAL JOURNAL, Issue 1 2003
Guy J. Zenner
The session initiation protocol (SIP) has emerged as a viable protocol for providing numerous services within today's networks. SIP was closely modeled after http to make it an easily extensible protocol that could provide connectivity in new converged Internet protocol (IP) networks. The inherent extensibility of SIP has allowed SIP to be used in many ways not envisioned by its creators. What started as a simple protocol for setting up a media stream between two endpoints has since found numerous seemingly unrelated uses. With many solutions using SIP being proposed and implemented, it is often hard to determine how best to use SIP for a particular solution. The purpose of this paper is to give the reader a framework for categorizing various SIP capabilities through the concept of usage models and to help the reader understand the various ways SIP can be used in both evolutionary and revolutionary ways in real-world networks. This paper assumes the reader has a basic understanding of SIP and its inner workings. © 2003 Lucent Technologies Inc. [source]

Mixtures of hemoglobin-based oxygen carriers and perfluorocarbons exhibit a synergistic effect in oxygenating hepatic hollow fiber bioreactors

BIOTECHNOLOGY & BIOENGINEERING, Issue 3 2010
Guo Chen
Abstract Hepatic hollow fiber (HF) bioreactors are being developed for use as bioartificial liver assist devices (BLADs). In general, BLADs suffer from O2 limited transport, which reduces their performance. This modeling study seeks to investigate if O2 carrying solutions consisting of mixtures of hemoglobin-based oxygen carriers (HBOCs) and perfluorocarbons (PFCs) can enhance O2 transport to hepatocytes cultured in the extra capillary space (ECS) of HF bioreactors. We simulated supplementing the circulating cell culture media stream of the HF bioreactor with a mixture containing these two types of oxygen carriers (HBOCs and PFCs). A mathematical model was developed based on the dimensions and physical characteristics of a commercial HF bioreactor. The resulting set of partial differential equations, which describes fluid transport; as well as, mass transport of dissolved O2 in the pseudo-homogeneous PFC/water phase and oxygenated HBOC, was solved to yield the O2 concentration field in the three HF domains (lumen, membrane and ECS). Our results show that mixtures of HBOC and PFC display a synergistic effect in oxygenating the ECS. Therefore, the presence of both HBOC and PFC in the circulating cell culture media dramatically improves transport of O2 to cultured hepatocytes. Moreover, the in vivo O2 spectrum in a liver sinusoid can be recapitulated by supplementing the HF bioreactor with a mixture of HBOCs and PFCs at an inlet pO2 of 80,mmHg. Therefore, we expect that PFC-based oxygen carriers will be more efficient at transporting O2 at higher O2 levels (e.g., at an inlet pO2 of 760,mmHg, which corresponds to pure O2 in equilibrium with aqueous cell culture media at 1,atm). Biotechnol. Bioeng. 2010; 105: 534,542. © 2009 Wiley Periodicals, Inc. [source]

Experiences from the Implementation and Use of Multimedia Synchronization Mechanisms

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 3 2000
Theodoros H. Bozios
This paper presents experiences from the implementation of Multimedia Synchronization Mechanisms related to the support of the many-to-one inter-media synchronization and describes the proposed Synchronization Architecture and its Design Objectives. The main goal of the communication system in the proposed architecture is to maintain the asynchrony levels between the media streams belonging in a Synchronization Group between the levels specitied by the Multimcdia Application. This is achieved through appropriate Synchronization Primitives related to the management and monitoring of the synchronization. The pilper emphasizes on the implementation issues and problems, and the solutions adopted. concluding to the lirst experiences from the use of the synchronization. [source]