| 1. |
- Johansson, Anders J, et al.
(författare)
-
Random Number Generation by Chaotic Double Scroll Oscillator on Chip
- 1999
-
Ingår i: Proceedings of the 1999 IEEE International Symposium on Circuits and Systems, ISCAS '99.. - 0780354710 ; 5, s. 407-409
-
Konferensbidrag (refereegranskat)abstract
- Generation of good non-repeatable and non-predictable random number sequences is of increasing importance, both in security applications and in simulations. A novel, compact system is presented in which a secure random number is generated by sampling a chaotic system and using this bitstream as the input to a pseudo-random generator. An optional hash function can be used on the seed in order to decrease the correlation. As all of the components can be implemented in a mixed-mode CMOS process, a totally self-contained non-repeatable random-number generator can be fabricated. This increases the security of the system, as very few of the systems parameters is observable from the outside. It also makes it possible to easily have available good random numbers in simulations if the chip is incorporated as a subsystem in an ordinary computer.
|
|
| 2. |
- Johansson, Karl Henrik, et al.
(författare)
-
On the regularization of Zeno hybrid automata
- 1999
-
Ingår i: Systems & control letters (Print). - : Elsevier. - 0167-6911 .- 1872-7956. ; 38:3, s. 141-150
-
Tidskriftsartikel (refereegranskat)abstract
- Fundamental properties of hybrid automata, such as existence and uniqueness of executions, are studied. Particular attention is devoted to Zeno hybrid automata, which are hybrid automata that take infinitely many discrete transitions in finite time. It is shown that regularization techniques can be used to extend the Zeno executions of these automata to times beyond the Zeno time. Different types of regularization may, however, lead to different extensions. A water tank control problem and a bouncing ball system are used to illustrate the results.
|
|
