By Francois Bancilhon, Gilles Barbedette (auth.), Klaus R. Dittrich (eds.)
This quantity collects papers offered on the second overseas Workshop on Object-Oriented Database structures (ooDBS-II) held on the Ebernburg close to undesirable Münster am Stein, FRG, in September 1988. It therefore supplies a complete evaluate of the newest advancements during this flourishing quarter of present database learn. Object-oriented database platforms were approached with as a rule significant intentions in brain, particularly to raised help new program parts like CAD/CAM, place of work automation, wisdom engineering, and to beat the 'impedance mismatch' among info versions and programming languages. The suggestion of object-orientation in database platforms is therefore a broader one than e.g. within the region of programming languages. Structural object-orientation presents for info version mechanisms that let the direct illustration and manipulation of highly-structured entities; behavioral object-orientation cares for amenities to affiliate arbitrary user-defined type-specific operations with facts entities; eventually, complete object-orientation attempts to mix some great benefits of either different types. although info version thoughts are the decisive characteristic of object-oriented database platforms, a number of different process elements need to be reconsidered or permit greater ideas, respectively, during this mild. They contain e.g. transactions, implementation strategies, optimization, formalization, the inclusion of principles, and the mixing with different structures. a few study prototypes or even a few advertisement structures are in the meantime to be had. either, ways to increase databases with object-oriented functions and ways to increase object-oriented programming languages with database beneficial properties were and are being investigated.
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Extra resources for Advances in Object-Oriented Database Systems: 2nd International Workshop on Object-Oriented Database Systems Bad Münster am Stein-Ebernburg, FRG September 27–30, 1988 Proceedings
Example text
This fact represents a significant difference with respect to both standard switched systems and positive systems. Another significant fact, which makes switched positive systems different from the previous ones we considered, is that monomial reachability is no longer sufficient for reachability. This is rather intuitive as, indeed, nonnegative combinations of switching sequences do not generally lead to admissible switching sequences (as they do not take values in P). To explore monomial reachability and reachability, it is first convenient to provide the explicit expression of the state at any time instant k ∈ Æ, starting from the initial condition x(0), under the effect of the input sequence u(0), u(1), .
References 1. : Random Dynamical Systems. Springer, Heidelberg (1998) 2. : From attractor to chaotic saddle: a tale of transverse instability. Nonlinearity 9, 703–737 (1996) Lyapunov Exponents and Normal Repellers 27 3. : Lyapunov Exponents and the Mathematics of Invasion in Oscillatory or Chaotic Populations. Theor. Population Biol. 48, 126–171 (1995) 4. : Robust Permanence for Ecological Differential Equations, Minimax, and Discretizations. SIAM J. Math. Anal. 34, 1007–1039 (2003) 5. : Chain transitivity, attractivity and strong repellors for semidynamical systems.
For positive switched systems, instead, if a switching sequence σ of length k exists such that Cone (Rk (σ )) = Ên+ , then the Reachability Analysis for Different Classes of Positive Systems 39 system is reachable, but the converse is not true [27]. Even the weaker condition that there exists a finite number of switching sequences of finite lengths, such that the union of the cones generated by the columns of their reachability matrices covers the positive orthant, is only sufficient for the system reachability.