14,996 research outputs found
Embedding object-oriented design in system engineering
The Unified Modeling Language (UML) is a collection of techniques intended to document design decisions about software. This contrasts with systems engineering approaches such as for exampleStatemate and the Yourdon Systems Method (YSM), in which the design of an entire system consisting of software and hardware can be documented. The difference between the system- and the software level is reflected in differences between execution semantics as well as in methodology. In this paper, I show how the UML can be used as a system-level design technique. I give a conceptual framework for engineering design that accommodates the system- as well as the software level and show how techniques from the UML and YSM can be classified within this framework, and how this allows a coherent use of these techniques in a system engineering approach. These ideas are illustrated by a case study in which software for a compact dynamic bus station is designed. Finally, I discuss the consequences of this approach for a semantics of UML constructs that would be appropriate for system-level design
Irreducibility is Minimum Synergy Among Parts
For readers already familiar with Partial Information Decomposition (PID), we
show that PID's definition of synergy enables quantifying at least four
different notions of irreducibility. First, we show four common notions of
"parts" give rise to a spectrum of four distinct measures of irreducibility.
Second, we introduce a nonnegative expression based on PID for each notion of
irreducibility. Third, we delineate these four notions of irreducibility with
exemplary binary circuits. This work will become more useful once the
complexity community has converged on a palatable or
measure.Comment: 15 pages, 6 figures. Only minor changes from v
Suppression of synchrotron radiation due to beam crystallization
With respect to a "hot", non-crystallized beam the synchrotron radiation of a
cold crystallized beam is considerably modified. We predict suppression of
synchrotron radiation emitted by a crystallized beam in a storage ring. We also
propose experiments to detect this effect.Comment: LaTeX, 3 pages, 1 figure, To be published in Eur. Phys. J. A,
December 199
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