Energy awareness plays an important role in developing routing protocol for the battery powered wireless sensor networks. As the replacement of the battery is often unfeasible in practical situations, we present here an optimal solution for the maximum utilization of precious available energy at the same time trying to minimize the latency in data delivery. We propose to form hierarchical chain...

Scientific workflows are being developed for many domains as a paradigm to manage complex scientific computations. In our work, we are challenged with efficiently generating and validating workflows that contain large amounts (hundreds to thousands) of individual computations to be executed over distributed environments. We describe a new approach to workflow creation and validation that uses s...

In this paper we present our ongoing work on the Pegasus File System (PFS), a distributed and customizable file system that can be used for off-line file system experiments and on-line file system storage. PFS is best described as an object-oriented component library from which either a true file system or a $le-system simulator can be constructed. Each of the components in the library is easil...

One of the most important problems of database management systems for CAD applications is modeling design objects and the complex relationships among them. Design objects have versions and participate in the construction of other more complexdesign -objects. In this paper we describe the preliminary data model design of a database system for CAD applications, named " Pegasus. Our model is based...

How do we find patterns and anomalies, on graphs with billions of nodes and edges, which do not fit in memory? How to use parallelism for such Teraor Peta-scale graphs? In this thesis, we propose PEGASUS, a large scale graph mining system implemented on the top of the HADOOP platform, the open source version of MAPREDUCE. PEGASUS includes algorithms which help us spot patterns and anomalous beh...

Verification and validation of automated driving functions impose large challenges. Currently, scenario-based approaches are investigated in research industry, aiming at a reduction testing efforts by specifying safety relevant scenarios. To define those scenarios operate complex real-world design domain, structured description the environment is needed. Within PEGASUS project, 6-Layer Model (6...