A Robust Overlay Network for Real-Time Multimedia Dissemination

2007 ◽  
Author(s):  
Qiang Zeng ◽  
Hua Miao ◽  
Zhaoliang Zhu
Keyword(s):  
Real Time ◽  
Overlay Network ◽  
Multimedia Dissemination

Resilient overlay network for real-time interactive multimedia sessions in corporate networks

2015 ◽  
Vol 22 (5) ◽  
pp. 543-557 ◽  
Author(s):  
Juan C. Granda ◽  
Pelayo Nuño ◽  
Julio Molleda ◽  
Rubén Usamentiaga ◽  
Daniel F. García
Keyword(s):  
Real Time ◽  
Interactive Multimedia ◽  
Overlay Network ◽  
Corporate Networks

scholarly journals RTSP-based Mobile Peer-to-Peer Streaming System

2010 ◽  
Vol 2010 ◽  
pp. 1-15 ◽  
Author(s):  
Jani Peltotalo ◽  
Jarmo Harju ◽  
Lassi Väätämöinen ◽  
Imed Bouazizi ◽  
Igor D. D. Curcio
Keyword(s):  
Real Time ◽  
Overlay Network ◽  
Low Complexity ◽  
File Sharing ◽  
Peer To Peer ◽  
Mobile Internet ◽  
Disruptive Technology ◽  
Mobile Environments ◽  
Mobile Environment ◽  
Media Delivery

Peer-to-peer is emerging as a potentially disruptive technology for content distribution in the mobile Internet. In addition to the already well-known peer-to-peer file sharing, real-time peer-to-peer streaming is gaining popularity. This paper presents an effective real-time peer-to-peer streaming system for the mobile environment. The basis for the system is a scalable overlay network which groups peer into clusters according to their proximity using RTT values between peers as a criteria for the cluster selection. The actual media delivery in the system is implemented using the partial RTP stream concept: the original RTP sessions related to a media delivery are split into a number of so-called partial streams according to a predefined set of parameters in such a way that it allows low-complexity reassembly of the original media session in real-time at the receiving end. Partial streams also help in utilizing the upload capacity with finer granularity than just per one original stream. This is beneficial in mobile environments where bandwidth can be scarce.

A DYNAMIC JITTER-CONTROLLED TREE-BASED P2P NETWORK TOPOLOGY FOR MULTIPOINT MULTIMEDIA APPLICATIONS

2012 ◽  
Vol 13 (01n02) ◽  
pp. 1250003 ◽  
Author(s):  
ALFIO LOMBARDO ◽  
ANTONIO MASTO ◽  
DIEGO REFORGIATO ◽  
GIOVANNI SCHEMBRA
Keyword(s):  
Real Time ◽  
Overlay Network ◽  
Video On Demand ◽  
Multimedia Streaming ◽  
Live Streaming ◽  
Video Content ◽  
P2p Systems ◽  
End To End Delay ◽  
Heterogeneous Nature ◽  
Better Than

In the last few years peer-to-peer (P2P) systems have gained ground for multipoint video content distribution over IP networks. P2P technologies give new opportunities to define an efficient multimedia streaming application, but at the same time they involve a set of technical challenges and issues due to the best-effort service offered by the underlying Internet, and its dynamic and heterogeneous nature. Stringent requirements in terms of end-to-end delay for real-time applications motivates the choice of a tree-structured topology against other topologies that have been introduced in the last research works, but mainly aimed at non-real-time services like video on demand and live streaming. The target of this paper is to present a platform for multipoint multimedia transmission based on a tree overlay network with jitter control and to show through experiments on real environment that our platform performs better than a traditional tree overlay network system in terms of PSNR, frame loss and playout frozen time.

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

Video real-time imaging of artificial membranes during freeze-drying by cryo-electron microscopy

1988 ◽  
Vol 46 ◽  
pp. 16-17
Author(s):  
Alan S. Rudolph ◽  
Ronald R. Price
Keyword(s):  
Real Time ◽  
Self Assembly ◽  
Freeze Drying ◽  
Video Capture ◽  
Drying Process ◽  
Artificial Membranes ◽  
The Past ◽  
Cryo Electron Microscopy ◽  
Spherical Structures ◽  
Capture Techniques

We have employed cryoelectron microscopy to visualize events that occur during the freeze-drying of artificial membranes by employing real time video capture techniques. Artificial membranes or liposomes which are spherical structures within internal aqueous space are stabilized by water which provides the driving force for spontaneous self-assembly of these structures. Previous assays of damage to these structures which are induced by freeze drying reveal that the two principal deleterious events that occur are 1) fusion of liposomes and 2) leakage of contents trapped within the liposome [1]. In the past the only way to access these events was to examine the liposomes following the dehydration event. This technique allows the event to be monitored in real time as the liposomes destabilize and as water is sublimed at cryo temperatures in the vacuum of the microscope. The method by which liposomes are compromised by freeze-drying are largely unknown. This technique has shown that cryo-protectants such as glycerol and carbohydrates are able to maintain liposomal structure throughout the drying process.

Sign in / Sign up

Export Citation Format

Share Document