A Temperature Analysis of High-power AlGaN/GaN HEMTs

Galliumnitride has become a strategic superior material for space, defense and civil applications, primarily for power amplification at RF and mm-wave frequencies. For AlGaN/GaN high electron mobility transistors (HEMT), an outstanding performance combined together with low cost and high flexibility can be obtained using a System-in-a-Package (SIP) approach. Since thermal management is extremely important for these high power applications, a hybrid integration of the HEMT onto an AlN carrier substrate is proposed. In this study we investigate the temperature performance for AlGaN/GaN HEMTs integrated onto AlN using flip-chip mounting. Therefore, we use thermal simulations in combination with experimental results using micro-Raman spectroscopy and electrical dc-analysis.Comment: Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions

Self-Directed Learning in Adaptive Training Systems: A Plea for Shared Control

In the field of aviation, air traffic controllers must be able to adapt to and act upon continuing changes in a highly advanced technological work environ- ment. This position paper claims that explicit training of self-directed learning skills (i.e. the ability to: formulate own learning needs, set own learning goals, and identify learning tasks that help to achieve personal learning goals) is important for future professionals in aviation. In this paper, we present an adaptive training system in which the system and trainee share control over learning task selection and which can help trainees to develop their self- directed learning skills

Fine grain thermal modeling and experimental validation of 3D-ICs

n/

Procedural Control in ATC Selection Tests to Predict Situational Awareness

At LVNL we have developed a new selection system, called DATCOSS, which should contribute to a higher output of qualified controllers from training. Two job sample tests are part of this selection system, specifically designed to measure the candidate’s potential for Situational Awareness by using simplified procedural control tasks. Grading takes half a day while AAPRO is a selective training module of five weeks. We examined the psychometric quality of both tests and the predictive validity of Grading for AAPRO. We may conclude that SA is sufficiently measured in the two job samples and that Grading results are rather predictive for performance in AAPRO. We made a start with analyzing predictive validity in relation to training success; this will be further examined in the near future