TY  - JOUR
A1  - Ghahremani, Sona
A1  - Giese, Holger
T1  - Evaluation of self-healing systems
BT  - An analysis of the state-of-the-art and required improvements
JF  - Computers
N2  - Evaluating the performance of self-adaptive systems is challenging due to their interactions with often highly dynamic environments. In the specific case of self-healing systems, the performance evaluations of self-healing approaches and their parameter tuning rely on the considered characteristics of failure occurrences and the resulting interactions with the self-healing actions. In this paper, we first study the state-of-the-art for evaluating the performances of self-healing systems by means of a systematic literature review. We provide a classification of different input types for such systems and analyse the limitations of each input type. A main finding is that the employed inputs are often not sophisticated regarding the considered characteristics for failure occurrences. To further study the impact of the identified limitations, we present experiments demonstrating that wrong assumptions regarding the characteristics of the failure occurrences can result in large performance prediction errors, disadvantageous design-time decisions concerning the selection of alternative self-healing approaches, and disadvantageous deployment-time decisions concerning parameter tuning. Furthermore, the experiments indicate that employing multiple alternative input characteristics can help with reducing the risk of premature disadvantageous design-time decisions.
KW  - self-healing
KW  - failure model
KW  - performance
KW  - simulation
KW  - evaluation
Y1  - 2020
U6  - https://doi.org/10.3390/computers9010016
SN  - 2073-431X
VL  - 9
IS  - 1
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Giese, Holger
A1  - Henkler, Stefan
A1  - Hirsch, Martin
T1  - A multi-paradigm approach supporting the modular execution of reconfigurable hybrid systems
JF  - Simulation : transactions of the Society for Modeling and Simulation International
N2  - Advanced mechatronic systems have to integrate existing technologies from mechanical, electrical and software engineering. They must be able to adapt their structure and behavior at runtime by reconfiguration to react flexibly to changes in the environment. Therefore, a tight integration of structural and behavioral models of the different domains is required. This integration results in complex reconfigurable hybrid systems, the execution logic of which cannot be addressed directly with existing standard modeling, simulation, and code-generation techniques. We present in this paper how our component-based approach for reconfigurable mechatronic systems, MECHATRONIC UML, efficiently handles the complex interplay of discrete behavior and continuous behavior in a modular manner. In addition, its extension to even more flexible reconfiguration cases is presented.
KW  - code generation
KW  - hybrid systems
KW  - reconfigurable systems
KW  - simulation
Y1  - 2011
U6  - https://doi.org/10.1177/0037549710366824
SN  - 0037-5497
VL  - 87
IS  - 9
SP  - 775
EP  - 808
PB  - Sage Publ.
CY  - London
ER  -