Search results for "SIM"

Puolijohdediodit ulkoisen sädehoidon potilasannosmittauksissa

2008

Sähkömagneettisen sironnan numeerinen simulointi

2004

Tietokonetomografian annosmittaukset : kalibrointikäytännöt ja epävarmuudet

2015

Tietokonetomografiassa säteilyannoksen määrittämiseen käytettävät ionisaatiokammiot kalibroidaan tavallisimmin vapaasti ilmassa suhteessa ilmakermaan. Kalibrointikäytännöistä voi kuitenkin aiheutua epävarmuutta annoksen määrittämiseen fantomimittauksissa, sillä olosuhteet fantomissa ovat erilaiset kuin vapaasti ilmassa. Tässä työssä tutkittiin kalibrointikäytännöistä johtuvia epävarmuuksia annosmittauksissa. Työn kokeellisessa osassa mitattiin erään puikkomaisen ionisaatiokammion energiavaste ja näiden tulosten pohjalta mallinnettiin kammio Monte Carlo -menetelmällä tehtäviä simulaatioita varten. Kammion mallintamisen jälkeen simulaatioissa tutkittiin absor…

CERN IRRADIATION FACILITIES.

2017

CERN provides unique irradiation facilities for applications in dosimetry, metrology, intercomparison of radiation protection devices, benchmark of Monte Carlo codes and radiation damage studies to electronics.

Síntesis asimétrica de carbociclos benzofusionados a partir de benzaldehídos o-funcionalizados. Aplicación de γ-silil alilboronatos en catálisis asim…

2015

El eje principal de la presente memoria se sitúa entorno al desarrollo de nuevas metodologías sintéticas a partir de benzaldehídos o-funcionalizados. Concretamente, se utilizará el o-bromo benzaldehído como sustrato de partida común en el contexto de la síntesis orientada a la diversidad. En el primer capítulo se ha desarrollado la reacción de Michael asimétrica intramolecular de cetiminas derivadas del auxiliar quiral de Ellman para la síntesis diastereoselectiva de derivados de indanonas. Mientras que la hidrólisis de las N-tert-butilsulfiniliminas permite acceder a indanonas 3-sustituídas quirales sin pérdida apreciable de pureza óptica, la reducción diastereodivergente de las iminas con…

Simultaneous optimization of harvest schedule and measurement strategy

2013

In many recent studies, the value of forest inventory information in the harvest scheduling has been examined. Usually only the profitability of measuring simultaneously all the stands in the area is examined. Yet, it may be more profitable to concentrate the measurement efforts to some subset of them. In this paper, the authors demonstrate that stochastic optimization can be used for defining the optimal measurement strategy simultaneously with the harvest decisions. The results show that without end-inventory constraints, it was most profitable to measure the stands that were just below the medium age. Measuring the oldest stands was not profitable at all. It turned out to be profitable t…

T9+HUD: Physical Keypad and HUD can Improve Driving Performance while Typing and Driving

2016

We introduce T9+HUD, a text entry method designed to decrease visual distraction while driving and typing. T9+HUD combines a physical 3x4 keypad on the steering wheel with a head-up-display (HUD) for projecting output on the windshield. Previous work suggests this may be a visually less demanding way to type while driving than the popular case which requires shifts of visual attention away from the road. We present a prototype design and report first results from a controlled evaluation in a driving simulator. While driving, the T9+HUD text entry rate was equal compared to a dashboard-mounted touchscreen device, but it reduced lane deviations by 70%. Furthermore, there was no significant di…

DOBRO : a prediction error correcting robot under drifts

2016

We propose DOBRO, a light online learning module, which is equipped with a smart correction policy helping making decision to correct or not the given prediction depending on how likely the correction will lead to a better prediction performance. DOBRO is a standalone module requiring nothing more than a time series of prediction errors and it is flexible to be integrated into any black-box model to improve its performance under drifts. We performed evaluation in a real-world application with bus arrival time prediction problem. The obtained results show that DOBRO improved prediction performance significantly meanwhile it did not hurt the accuracy when drift does not happen.

Measuring Distraction at the Levels of Tactical and Strategic Control: The Limits of Capacity-Based Measures for Revealing Unsafe Visual Sampling Mod…

2011

The control theory of driving suggests that driver distraction can be analyzed as a breakdown of control at three levels. Common approach for analyzing distraction experimentally is to utilize capacity-based measures to assess distraction at the level of operational control. Three driving simulation experiments with 61 participants were organized to evaluate which kind of measures could be used to analyze drivers' tactical visual sampling models and the related effects of distraction while searching textual information on in-car display. The effects of two different text types were evaluated. The utilized capacity-based measures seemed to be insufficient for revealing participants' tactical…

Wastewater treatment: New insight provided by interactive multiobjective optimization

2011

In this paper, we describe a new interactive tool developed for wastewater treatment plant design. The tool is aimed at supporting the designer in designing new wastewater treatment plants as well as optimizing the performance of already available plants. The idea is to utilize interactive multiobjective optimization which enables the designer to consider the design with respect to several conflicting evaluation criteria simultaneously. This is more important than ever because the requirements for wastewater treatment plants are getting tighter and tighter from both environmental and economical reasons. By combining a process simulator to simulate wastewater treatment and an interactive mul…