Refine
Year of publication
- 2010 (343) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (73)
- Fachbereich Wirtschaftswissenschaften (41)
- IfB - Institut für Bioengineering (40)
- Fachbereich Elektrotechnik und Informationstechnik (36)
- Fachbereich Chemie und Biotechnologie (35)
- Fachbereich Energietechnik (35)
- Fachbereich Maschinenbau und Mechatronik (31)
- Fachbereich Bauingenieurwesen (24)
- Fachbereich Luft- und Raumfahrttechnik (24)
- INB - Institut für Nano- und Biotechnologien (23)
Language
- English (187)
- German (153)
- Italian (2)
- Multiple languages (1)
Document Type
- Article (140)
- Conference Proceeding (100)
- Book (38)
- Part of a Book (23)
- Conference: Meeting Abstract (20)
- Patent (7)
- Report (5)
- Doctoral Thesis (2)
- Other (2)
- Part of a Periodical (2)
Keywords
- Aachen / Fachhochschule Aachen (3)
- Aachen University of Applied Sciences (3)
- FH Aachen (2)
- Geschichte (2)
- avalanche (2)
- humans (2)
- Adsorbentien (1)
- Cardiovascular MRI (1)
- Cardiovascular Magnetic Resonance (1)
- Commercial Vehicle (1)
A novel tomographic scheme for analysing the state of any single membrane electrode assembly (MEA) in a stack is suggested. Plates of very high conductivity placed between every fuel cell and slitted in an appropriate manner cause surface currents at well-defined locations of the stack. We show that knowing these surface currents, information about anomalies of the currents in a MEA can be obtained using the methods of tomography. The results are mathematically not unique. However, when assuming plausible defect structures, one can exclude improbable deficiencies by applying a special form of simulated annealing. We present numerical calculations of typical examples demonstrating that the essential defects of the MEA in any single cell of the stack can be detected and their extent can be determined.
Currently, most workflow management systems in Grid environments provide push-oriented job distribution strategies, where jobs are explicitly delegated to resources. In those scenarios the dedicated resources execute submitted jobs according to the request of a workflow engine or Grid wide scheduler. This approach has various limitations, particularly if human interactions should be integrated in workflow execution. To support human interactions with the benefit of enabling inter organizational computation and community approaches, this poster paper proposes the idea of a pull-based task distribution strategy. Here, heterogeneous resources, including human interaction, should actively select tasks for execution from a central repository. This leads to special demands regarding security issues like access control. In the established push-based job execution the resources are responsible for granting access to workflows and job initiators. In general this is done by access control lists, where users are explicitly mapped to local accounts according to their policies. In the pull-based approach the resources actively apply for job executions by sending requests to a central task repository. This means that every resource has to be able to authenticate against the repository to be authorized for task execution. In other words the authorization is relocated from the resources to the repository. The poster paper introduces current work regarding to the mentioned security aspects in the pull-based approach within the scope of the project “HiX4AGWS”.