O projektiranju, mjerenjima i robusnoj regulaciji u bežičnim telekomunikacijskim mrežama

Over the years a lot of rigorous mathematical analysis has been done by systems and controls community for the optimization of multivariable systems with a mathematically rigorous systems theoretic approach. In parallel, wireless telecommunication industry was working on performance measurement analysis tools achieving demonstrable optimization. This paper will elaborate on the need for finding common grounds these two approaches. Some existing measurement tools are also presented. Decision on measurement tools in design of telecommunications networks implies tradeoffs between reliability, capacity, and the economics in meeting customer demands. The paper first identifies the parameters which can and should be measured to facilitate the optimization for performance of telecommunication networks. Secondly, there are given available resources on measurements tools for these parameters together with a comparative analysis. Thirdly, the hardware setup for some of these measurements will be explained. Finally, a method to find the robust controller for wireless network is introduced.Kroz godine je mnogo postignuto u optimizaciji multivarijabilnih sustava kroz rigorozan matematički teoretski pristup. U isto vijeme, u bežičnoj telekomunikacijskoj industriji radilo se na metodama za mjerenje i analizu kako se moglo optimirati rad telekomunikacijske mreže. Glavna tema ovog rada je uvod u analizu koja povezuje teoriju regulacijskih sustava i optimiranje rada bežičnih telekomunikacijskih mreža. Neke postojeće mjerne metode su također objašnjene. Izbor mjernih metoda i mjerenja potrebnih za uspostavljanje optimalne i pouzdane bežične telekomunikacijske mreže uključuje uspostavljanje ravnoteže između pouzdanosti, kapaciteta i cijene u zadovoljavanju trenutnih i budućih potreba korisnika. Uspostavljanje i održavanje efikasne bežične telekomunikacijske mreže jesvakodnevni izazov. Ovaj rad prvo identificira parametre koji mogu i trebaju biti mjereni kako bi se omogućilo optimiranje rada mreže. Zatim je data kratka analiza opreme za mjerenje uz objašnjenje hardwera za takva mjerenja. Na kraju je dana struktura robusnog regulatora za bežične telekomunikacijske mreže

A performance model for early word learning

The emergence of language around a child’s first birthday isone of the greatest transformations in human development.Does this transition require a fundamental shift in the child’sknowledge or beliefs, or could it instead be attributable to moregradual changes in processing abilities? We present a simplemodel of cognitive performance that supports the second con-clusion. The premise of this model is that any cognitive op-eration requires multiple steps, each of which require sometime to complete and have some probability of failure. Weuse meta-analysis to estimate these parameters for two com-ponents of simple ostensive word learning: social cue use andword recognition. When combined in our model, these esti-mates suggest that learning should be very difficult for chil-dren younger than around a year, especially with gaze alone.This model takes a first step towards quantifying performancelimitations for cognitive development and may be broadly ap-plicable to other developmental changes