Summary
Tutorial is planned to present fundamentals of video compression standards known as MPEG and its historical development.
MPEG compression is a very complex subject. Therefore tutorial will start with description of modern TV systems, video production formats and then have a look at video compression standards (JPEG, H.261, H.263, MPEG-1, MPEG-2 and MPEG-4).
Standards documents and some applications will be mentioned.
Then video compression technology of MPEG-1 and MPEG-2 will be
discussed in details:
- preprocessing
- temporal compression
- spatial compression
- rate control.
Sampling methods and DCT function are crucial points in preparing the picture structure.
Further on the MPEG audio compression technology will be presented and transport stream formation discussed. After that features of MPEG-4 standard and its relation to MPEG-2 will be given. At the end outlines of MPEG-7 as a new standard to be accepted in the near future will be presented.
Duration: 3 hours
Target audience: technicians interested in data compression for multimedia contents transmission. Some backgroung in transmission systems and mathematical transformations would be appreciated, but not indispensable.
Summary
The presentation has a duration of 3 hours and covers the main issues related to WDM optical networking in a tuturial form, that is made for people that like to know more about this topic without requiring in depth knowledge of optical technologies and system. This presenation has already been made at universities, even if it is updated.
Summary of the presentation
| 1. Motivations for optical networking | ||
| The advances in WDM technology makes allowable the realization of high-capacity optical link, and give the possibility of provide networking solutions that present significant advantages with traditional ones, such as flexibility, transparency, and easy and fast failure restoration. Furthermore, the bottlenecks introduced by the electronic technology, for the realization of high throughput nodes (e.g. digital cross-connect), are removed since no-very fast switching/routing circuitry is required. | ||
| 2. Key system issues in optical networking | ||
| The key issues related to these technology, are discussed, and the features presented by optical WDM networking are explained. | ||
| 3. Architectures for optical nodes | ||
| Relevant cases of optical nodes architectures are reported and discussed. Since this is a crucial point in the design of future system, several technological and system aspects will be treated in details. | ||
| 4. Technologies for practical implementations | ||
| The main technologies are reported. Results obtained by system analysis, in some relevant cases, are reported and discussed. Some practical demonstrator is also presented. | ||
Duration: 3 hours
Target audience: The presentation covers the main issues related to WDM optical networking in a tutorial form, that is made for people that like to know more about this topic without requiring in depth knowledge of optical technologies and system.
Summary
Distributed multimedia applications and
multimedia teleservices will be an important part of the
information society. The system platforms on which distributed
multimedia applications reside can generally be decomposed into
the following elements: network, transport and higher layer
communication protocols (middleware), database systems, and
operating systems. In this context, the operating system plays a
central role, because middleware, database system, and
applications are build on top of operating systems. Furthermore,
each data element arriving at the network interface has to
traverse at least once the operating system kernel to reach the
application (and vice-versa). Therefore, it is important for
researchers and developers in the area of distributed multimedia
systems to know and understand
(1) requirements of distributed multimedia systems onto operating
systems, and
(2) new approaches and solutions for operating systems to achieve
high performance for multimedia and support Quality-of-Service
(QoS).
The goal of this tutorial is to identify, explain, and discuss these two topics. The general structure of the tutorial is as follows:
| Introduction | ||
| Operating systems | ||
| Distributed multimedia systems | ||
| Case: the electronic classroom | ||
| The "new" challenges for operating systems | ||
| Overview over the tutorial | ||
| Resource management for QoS support in operating systems | ||
| Characterization of operating system resources | ||
| Relationships between resources and QoS | ||
| Scheduling of processes and threads | ||
| Case: scheduling of a multi-threaded communication subsystem | ||
| Disk scheduling | ||
| Packet scheduling | ||
| Buffer management | ||
| New approaches to improve OS performance for multimedia applications | ||
| Buffer management | ||
| Case: Q-L/MRP | ||
| File system | ||
| Case: Log-structured file system for continous media | ||
| Conclusions | ||
| Trends in OS research | ||
| Summary | ||
Duration: 3 hours
Target audience: Researchers, developers, and students that are working in the area of distributed multimedia systems, including communication protocols, applications, database systems, etc. A general understanding of operating system concepts is of advantage.
Summary
Multicast communication can be simply defined as the ability of a node to send a message to one or more receiving nodes in a single operation. A multicast-enabled network must, therefore, allow any host to transmit a single copy of a packet to a multicast address and have the packet be delivered to the widely-dispersed members of the multimedia communication group. What differentiates multicast applications from unicast application is the relationship between senders and receivers that multicast communication enables. In general, three categories of multicast applications can be specified:
* One-to-Many, where a single host sends
to two or more receivers,
* Many-to-Many, where any number of hosts sends and
receives data
to a multicast group address,
* Many-to-One, where communication takes place between one
or
more senders and the nearest of several receivers.
Multimedia conferencing, computer-supported collaborative work, and distance learning are but few examples of Internet-based applications where multicasting is poised to play a major role in their successful deployment. It is, therefore, important that network developers and researchers be aware of the design issues related to multicast communication in order to avoid impacting the performance of the multimedia applications.
Multicast communication brings about challenging network design issues which require the development of new network protocols and components to support routing and group management. The objective of this tutorial is to provide a clear explanation of the multicast technology, its status, and the barriers to its deployment, and discuss the main protocols used for multicast routing within the Internet.
The specifics topics of this tutorial include:
* Multicast IP Fundamentals
* Internet Group Management Protocol
* Multicast Addressing in the Internet
* Reverse-Path Multicasting
* Distance-Vector Multicast Protocols
-DVRMP
* Link-State Multicat Protocols
-MOSPF
* Protocol Independent Multicast Protocols
- Dense Mode
- Sparse Mode
* Core-Based Trees
* Reliable Multicast Protocols
Duration: 3 hours
Target audience: technicians interested in data networks and TCP/IP protocol suite