Abstract-We present the results of an analysis of the usage of our new campus-wide wireless network. A week-long traffic trace was collected in January 2003, recording address and protocol information for every packet sent and received on the wireless network. A centralised authentication log was used to match packets with wireless access points. The trace was analysed to answer questions about where, when, how much, and for what our wireless network is being used. Such information is important in evaluating design principles and planning for future network expansion.

The performance of lithium-ion batteries is determined by the structural properties of the electrodes, e.g., the choice of an active material and porosity. An increase in performance is crucial for fulfilling the future requirements of various applications, such as electric vehicles and consumer electronics. Laser structuring with short and ultrashort pulses offers great potential, which has been demonstrated in many research studies. Based on already published preliminary work, which is primarily dedicated to the proof of electrochemical enhancements, requirements for the structuring process are examined. Starting from a realistic production scenario for lithium-ion electrode processing, calculations concerning the technical requirements for the laser scanner system are made. The results show high demands on usable control technology. For this reason, the development of a new type of control system is presented, which has significantly more temporal accuracy in signal transmission and thus provides the basis for fast and, at the same time, high-precision processing with pulsed laser systems.

In recent years, there has been much research and development of wearable devices using accelerometers for studying physical activity. Previously, we have described the development of the Posture and Activity Detector (PAD). After demonstrating success with PAD, we were motivated to improve the design by taking the device one step further and implementing all of these components on a single printed circuit board, adding a few additional features to make the system more flexible, and custom-designing an outer case. We have continued our efforts in improving PAD with respect to software development as well as making PAD more physically robust and mass producible. In this paper, the specifications for PAD will be outlined including its hardware and software components, and clinical research applications.

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