- Modelling and Managing the Variability of Web Service-based Systems ( ), In Journal of Systems and Software, volume 83, 2010.
- Channel-based Coordination via Constraint Satisfaction ( ), In Science of Computer Programming, 2010.
- Automated graph-based methodology for fault detection and location in power systems ( ), In IEEE Transactions on Power Delivery, volume 25, 2010.
This study investigates how the model-based fault detection and location approach of structural analysis can be adapted to meet the needs of power systems, where challenges associated with increased system complexity make conventional protection schemes impractical. With a global view of the protected system and the systematic and automated use of the system's analytical redundancy, faults are detected and located by more than one means. This redundancy can be used as a confirmation mechanism within a wide-area protection scheme to avoid unnecessary or false tripping due to protection component failure or disturbance. Furthermore, this redundancy turns the sensor configuration problem into an optimization problem with regard to fault detection and location. The effectiveness of different system topologies can then be compared on the basis of the optimal number of sensors they require. The principle of structural analysis is described in detail and illustrated on a simple power system model. Pertinence of the approach is demonstrated through simulation. © 2010 IEEE.
Keywords: Fault diagnosis, Power system protection, Structural analysis, Wide-area protection
- A survey of variability management requirements ( ), In 5th SIKS/BENAIS Conference on Enterprise Information Systems, EIS 2010, CEUR Workshop Proceedings (CEUR-WS.org), volume 662, 2010.
- Requirements and Tools for Variability Management ( ), In Computer Software and Applications Conference Workshops (COMPSACW), IEEE (The Institute of Electrical and Electronics Engineers), 2010.
Explicit and software-supported Business Process Management has become the core infrastructure of any medium and large organization that has a need to be efficient and effective. The number of processes of a single organization can be very high, furthermore, they might be very similar, be in need of momentary change, or evolve frequently. If the ad-hoc adaptation and customization of processes is currently the dominant way, it clearly is not the best. In fact, providing tools for supporting the explicit management of variation in processes (due to customization or evolution needs) has a profound impact on the overall life-cycle of processes in organizations. Additionally, with the increasing adoption of Service-Oriented Architectures, the infrastructure to support automatic reconfiguration and adaptation of business process is solid. In this paper, after defining variability in business process management, we consider the requirements for explicit variation handling for (service based) business process systems. eGovernment serves as an illustrative example of reuse. In this case study, all local municipalities need to implement the same general legal process while adapting it to the local business practices and IT infrastructure needs. Finally, an evaluation of existing tools for explicit variability management is provided with respect to the requirements identified.
Keywords: workflow management software, software architecture, business data processing, web services
- ValySeC: a Variability Analysis Tool for Service Compositions using VxBPEL ( ), In , 2010.
- Interoperation, Composition and Simulation of Services at Home ( ), In International Conference on Service Oriented Computing, 2010.
- A tool for integrating pervasive services and simulating their composition ( ), In International Conference on Service Oriented Computing, Demo Session, 2010.
- Towards a Service-Oriented Energy Market: Current state and trend ( ), In Workshop on Service, Energy and Ecosystems (colocated with ICSOC-10), 2010.
- Modeling Enterprise Information Systems Integration Evaluation as a Dynamic System ( ), In International Conference on Computing and ICT Research, 2010.
- Resolving Business Process Interference via Dynamic Reconfiguration ( ), In International Conference on Service Oriented Computing, 2010.
- Mining Twitter in the Cloud: A Case Study ( ), In IEEE 3rd International Conference on Cloud Computing, 2010.
- Parity space approach for enhanced fault detection and intelligent sensor network design in power systems ( ), In , 2010.
In this study, the model-based fault detection and isolation (FDI) approach of parity-space is adapted to the diagnosis of sensor faults in power systems. Hardware redundancy is conventionally utilized to overcome this problem. However, this is an expensive solution. Instead, we propose to detect and locate faults by the systematic use of the system's analytical redundancy, with a global view of the system. This redundancy can be used to detect and isolate sensor failure as well. We also give necessary and sufficient conditions for a sensor network to be able detect faults, sensor failures included. Hence, the sensor configuration problem boils down to an optimization problem that can be intelligently guided by our method. The principle of parity-space approach is described in detail and illustrated on a simple power system model. The method is then validated through simulation. ©2010 IEEE.
Keywords: Fault diagnosis, Power system protection, Sensor, Wide-Area protection
- Concept mapping for faster QoS-Aware Web Service Composition ( ), In IEEE Conference on Service Oriented Computing and Applications, 2010.
- Testing Service-oriented Architectures using a simulation ( ), Master's thesis, Rijksuniversiteit Groningen, 2010.