An overview on linearity and efficiency performance optimisation in power amplifier (PA) is presented, stressing the required trade-off demanded to PA designers. For efficiency improvement, the harmonic tuning strategies are discussed, with their advantages and major drawbacks. For linearity improvement, the IMD sweet spot optimisation strategies is presented as a solution to obtain low intermo...

We propose a novel grating coupler design which is inherently reflectionles by focusing the reflecte light away from the entrance waveguide. The design rules for this reflectionles grating coupler are explained and the grating coupler design is investigated by means of 3D FDTD simulations for the case of a Silicon-on-Insulator based platform. References and links 1. D. Taillaert, W. Bogaerts, P...

We describe a cascaded method for object detection. This approach uses a novel organization of the first cascade stage called “feature-centric” evaluation which re-uses feature evaluations across multiple candidate windows. We minimize the cost of this evaluation through several simplifications: (1) localized lighting normalization, (2) representation of the classifier as an additive model and ...

Soderberg electrodes feature prominently in the operation of metallurgical electrical furnaces. The electrode material must bake before entering furnace; failure to will lower efficien...

This paper introduces polymorphic ejection chains, and applies them to the problem of repairing time assignments in high school timetables while preserving regularity. An ejection chain is a sequence of repairs, each of which removes a defect introduced by the previous repair. Just as the elements of a polymorphic list may have different types, so in a polymorphic ejection chain the individual ...

Stacking is a widely used technique for combining classifier and improving prediction accuracy. Early research in Stacking showed that selecting the right classifiers their parameters and the meta-classifier was a critical issue. Most of the research on this topic hand picks the right combination of classifier and their parameters. Instead of starting from these initial strong assumptions, our ...

Nowadays people are faced daily with the management of all types of technological devices that have embedded processors inside. The desire of users and the industry is to achieve a natural interaction with these devices. Researchers have spent many years working in spoken dialog systems which are now used in many applications. In these systems it is crucial to achieve correct speech recognition...