Scientific publications

The use of mobile devices is limited by the battery lifetime. Some devices have the option to connect an extra battery, or to use smart battery-packs with multiple cells to extend the lifetime. In these cases, scheduling the batteries over the load to exploit recovery properties usually extends the system lifetime.

In this paper, we describe a case study at Philips Healthcare MRI focusing on evolutionary couplings, i.e., a technique to infer relationships among modules by analyzing their history of changes in the source code archive. In this case study, we failed to transfer CouplingViewer, a tool implementing the current state-of-art in evolutionary couplings, to industry.

Synchronous dataflow graphs (SDFGs) are widely used to model streaming applications such as signal processing and multimedia applications. These are often implemented on resource-constrained embedded platforms ranging from PDAs and cell phones to automobile equipment and printing systems. Trade-off analysis between resource usage and performance is critical in the life cycle of those products, from tailoring platformsto target applications at design time to resource management at runtime.

This paper presents a simple resource control mechanism with traffic scheduling for 2-hop ad-hoc networks, in which the Request-To-Send (RTS) packet is utilized to deliver feedback information. With this feedback information, the Transmission Opportunity (TXOP) limit of the sources can be controlled to balance the traffic.

With the increasing capabilities of Wireless Sensor Networks (WSN), complexity and expectation of the WSN applications increase as well. In order to make design-space exploration possible, it is necessary to have fast models that provide adequate insight in system behavior. In this paper, we propose a highly abstracted, hierarchical, system-level modeling method for WSN.

Wireless sensor networks (WSNs) consist of numerous sensor nodes with several possible configurations for each node. As there are a lot of nodes in a typical WSN, each with its own set of configurations, the number of configurations for the network as a whole is huge and the design space is extremely large.

Electronic passports, or e-passports for short, contain a contactless smartcard which stores digitally signed data. To rigorously test e-passports, we developed formal models of the e-passport protocols that enable model-based testing using the TorXakis framework.

The three technical universities in the Netherlands (Eindhoven University of Technology, Delft University of Technology and University of Twente), abbreviated as 3TU, started a joint master on Embedded Systems in 2006. Embedded Systems is an interdisciplinary area of Electrical Engineering, Computer Science, Mechanical Engineering and Applied Mathematics.

In this paper, we present a dynamic analysis approach to increase the understandability of a large softwareintensive system, more particularly to enable the identification of dependencies between its execution entities. This approach analyzes the execution of a software system in a top-down fashion to cope with complexity and uses execution entities such as scenarios, components, and processes rather than code artifacts such as modules, classes, or objects.

Conformance testing for labeled transition systems starts with defining when an implementation conforms to its specification. One of the formal theories for model-based testing uses the implementation relation ioco for this purpose. A peculiar aspect of ioco is to consider the absence of outputs as an observable action, named quiescence.