Tutorials
Extranets: Concepts, Standards and Cost Issues
Algirdas Pakstas, University of Sunderland, UK
Abstract: This tutorial is devoted to the new emerging area of the Internet
use, namely, "extranets". This is often referred as a "third wave"
of the universal Internet. Definitions and examples of extranet are given. Extranets
are compared with better known intergroupware and the concepts of Communications,
Collaboration, and Coordination are illustrated. Notion of multi-extranet is
introduced as a special case typically found in the Science Park (SP) environments.
Three types of the organizations using facilities of the SP and having different
relationships with its multi-extranet are distinguished: (a) "normal" firms
which will have their own Intranets and access to the Internet either on their
own or via SP facilities; (b) "small" firms, which will obtain access to the
Internet via SP facilities and with the only Intranet, which will be actually
extranet; (c) "large" firms which, perhaps, will not bother to connect to the
SP facilities at all. Open application standards are discussed and example of
suite of standards supported by consortium established by the Netscape Communications
is briefly presented. Roles of network management and security issues are outlined
as crucial for the success of the electronic commerce. Existing experience of
running Intranets is discussed and accepted as applicable for extranets and
criteria for choosing planning strategy for building of extranets are suggested.
Based on the existing experience the "top 5" problems have been identified
such as Internal Information Exchange, Discussions, Line-of-business Applications,
Collaborations and Link to Partners. Typical cost items are identified and cost
models are discussed for the cases such cost of running Web-sites of various
complexity, access expenses for mobile users/workers (via mobile telephones
and ISDN connections) as well as losses caused by the downtime. Typical two
phases for building of extranet are suggested: (I) is focusing on the applications
and standards which will help to solve mentioned "top 5" problems,
and (II) is devoted to future development of the extranet and "flourishing"
of the links with the customers as well as electronic commerce facilities.
Turbo Codes: A tutorial survey from theoretical understanding to applications
Sergio Benedetto, Polytechnic of Turin, Italy
Abstract: The tutorial will present turbo codes and other form of
concatenated codes with interleavers starting from their first presentation
(ICC '93), passing through the first successful attempts to explain their exceptionally
good performance, and arriving to a few guidelines for the code design. The
last part of the talk will deal with applications, and, in particular, the new
CCSDS telemetry channel coding standard, and the UMTS standard.
New Generation Optical IP Networks
Andrzej Jajszczyk, University of Mining and Metallurgy , Poland
Abstract: The tutorial addresses the IP over WDM networking technology
supporting multiple services. The tutorial will provide a comprehensive overview
of various alternatives for carrying IP traffic over WDM or DWDM networks, including
IP over SONET/SDH over WDM and IP over WDM. Several encapsulation and framing
approaches using PPP, HDLC, SDL, and Gigabit Ethernet will be discussed. Methods
enabling IP to serve as a multiprotocol platform will be presented including
such protocols as IntServ, DiffServ, and MPLS. Role of the ATM layer will be
discussed, evaluated and compared with that of multiprotocol IP. Selected practical
experiences with optical IP networks will be presented.
Research emphasis is on advanced software technologies for development of telecommunication networks, as used in switches, for signaling and in network management, with a focus on object and component technology and formal definition techniques. Besides the academic involvement at the university, Dr. Luderer has been teaching short courses since 1992 on high-speed networks and telecommunication software architecture in various countries. From 1965 to 1989, Dr. Luderer was with AT&T Bell Labs, at last directing research on next generation switch architectures, based on fast packet switching technology on the hardware side and object-oriented design technology on the software side, resulting in some of the earliest demonstration networks for multimedia communication. Dr. Luderer holds Diplomingenieur (M.S) and Dr.-Ing. (Ph.D) degrees in Electrical Engineering from the Technical University of Braunschweig, Germany. He holds two patents. While at Bell Labs, he taught at Stevens Institute of Technology in Hoboken, NJ, and at Princeton University. He is member of ACM, IEEE, IEEE Computer and Communication Societies.
Software as Intellectual Property - a Technologist's View
Gottfried W. R. Luderer, Arizona State University, USA
Abstract: In this half-day seminar, we will look at the history of software
evolution from an intellectual property perspective. How are people who generate
software being rewarded? We are not taking a legalistic viewpoint but are rather
more interested in the economic aspects, as seen from the point of view of a
technologist with interest in marketing. This will eventually lead us from history
to some speculations about the future. Milestones to be discussed are the initial
bundling of software with hardware, the struggle for the viability of software
patents, the role of the Unix T operating system, initial free software like
Gnu, leading to Linux as the currently most prominent exponent. Other aspects
are the open source movement, the role of standards and the struggle to control
them, and the recent illicit music copying using the Napster program. How could
the network evolve to help or hinder some of the recent occurrences, and what
are the likely and desirable characteristics of network features to foster a
healthy evolution of the software field?
WTFC Applications in Integrated Networks
Julije Ozegovic, University of Split, Croatia
Abstract: To integrate voice and data traffic in packet switching networks,
the problems of admission control, resource reservation, scheduling, flow control
and flow conformance control are to be solved. WTFC (Window-Time space Flow
Control) is recently proposed technology for efficient end-to-end packet rate
and window regulation. WTFC uses deterministic model of network response with
finite number of packets, which defines the Window-Time plane. Current window
and round trip time measurements are used to calculate optimal packet rate and
window. WTFC keeps the network at the working point of on average empty packet
queues, thus being prospective in the area of voice and data integration. WTFC
can be used to solve several common problems: data flow regulation in presence
of data and persistent (voice) traffic, flow conformance control, voice coding
mode and rate selection, and customer admission control. In this tutorial, the
overview of the WTFC theory is continued with WTFC applications in voice-data
integration field. Simulation experiment traces are shown and analyzed.