In this paper, we define the concept of digital actors and show their importance in the future interactive digital television and multimedia. We discuss the applications of these digital actors in the new multimedia services especially for training and education. We summarize the main techniques to create and control these digital actors and emphasize the importance to develop new tools for the...

Digital watermarking technology has been actively studied and developed by a number of institutions and companies since mid ‘90s. This area draws more and more attention as one of the key technology elements for content management, copyright protection and copy control of digital contents. This article discusses several different types of digital watermark application, particularly the applicat...

Based on the ICD (Individual channel Design) approach, the design of a multivariable digital submarine depth control system is presented. The model of the submarine is the standard 80 meters British submarine. As expected, the frequency rate of sampling introduces limitations to achieve the required responses. Furthermore, the discrete model presents zeros close to imaginary axis resulting in a...

In this paper, our recent studies on multirate sampling control and its application to motion control systems are reviewed. Especially, multirate two-degreeof-freedom controllers are focused on, where it is restricted that the sampling period of plant output is longer than the control period. The proposed controllers assure perfect tracking control (PTC) and perfect disturbance rejection (PDR) ...

Numerical integration methods are used to find the numerical solution of the transient analysis of electrical circuits. Because the electrical circuits are modelled by stiff differential algebraic equations, the BDF-methods are very popular in circuit simulation. Error control is used to handle with the trade-off between efficiency and accuracy. For optimization purposes smooth behaviour of the...

The last few years, a considerable number of studies have been made on a digital control. One reason is that this technique will lead to a future energy management and system integration. At a first step, it may be helpful to begin with a study of the design criterion of the digital control. Although studies have been made on the digital unique characteristics, there is little agreement on the ...