Implementation and verification of a hardware-basedcontroller for a three-phase induction motor on an FPGA

L’objectiu d’aquesta tesi és estudiar diverses tècniques de control motor per tal d’implementar i verificar un controlador basat en hardware per a un motor d’inducció trifàsic desenvolupat en llenguatge VHDL i funcionant en una FPGA Artix-7 (Xil-inx). Aquest controlador està basat en tècniques de variació de freqüència. Els mòduls que defineixen la descripció de hardware funcionen simultàniament entre ells, i permeten agilitzar el sistema, millorant el rendiment i la resposta del motor, en comparació amb un microcontrolador. Aquesta tesi està relacionada amb els sistemes digitals, l’electrònica de potència i els sistemes de control.Outgoin

El semigrup característic d'un espai quocient separat

According the definition of the characteristic semigroup of a Hausdorff topological space given by S.B. O'Reilly, we calcule the characteristic semigroup of a Hausdorff quotient space X/R-for different classes of equivalence relations on

Texture descriptors applied to digital mammography

Breast cancer is the second cause of death among women cancers. Computer Aided Detection has been demon- strated an useful tool for early diagnosis, a crucial as- pect for a high survival rate. In this context, several re- search works have incorporated texture features in mam- mographic image segmentation and description such as Gray-Level co-occurrence matrices, Local Binary Pat- terns, and many others. This paper presents an approach for breast density classi¯cation based on segmentation and texture feature extraction techniques in order to clas- sify digital mammograms according to their internal tis- sue. The aim of this work is to compare di®erent texture descriptors on the same framework (same algorithms for segmentation and classi¯cation, as well as same images). Extensive results prove the feasibility of the proposed ap- proach.Postprint (published version

Computer-Aided Detection and diagnosis for prostate cancer based on mono and multi-parametric MRI: A review

International audienceProstate cancer is the second most diagnosed cancer of men all over the world. In the last decades, new imaging techniques based on Magnetic Resonance Imaging (MRI) have been developed improving diagnosis.In practise, diagnosis can be affected by multiple factors such as observer variability and visibility and complexity of the lesions. In this regard, computer-aided detection and computer-aided diagnosis systemshave been designed to help radiologists in their clinical practice. Research on computer-aided systems specifically focused for prostate cancer is a young technology and has been part of a dynamic field ofresearch for the last ten years. This survey aims to provide a comprehensive review of the state of the art in this lapse of time, focusing on the different stages composing the work-flow of a computer-aidedsystem. We also provide a comparison between studies and a discussion about the potential avenues for future research. In addition, this paper presents a new public online dataset which is made available to theresearch community with the aim of providing a common evaluation framework to overcome some of the current limitations identified in this survey

Encouraging early mastery of computational concepts through play

Learning to code, and more broadly, learning about computer science is a growing field of activity and research. Under the label of computational thinking, computational concepts are increasingly used as cognitive tools in many subject areas, beyond computer science. Using playful approaches and gamification to motivate educational activities, and to encourage exploratory learning is not a new idea since play has been involved in the learning of computational concepts by children from the very start. There is a tension however, between learning activities and opportunities that are completely open and playful, and learning activities that are structured enough to be easily replicable among contexts, countries and classrooms. This paper describes the conception, refinement, design and evaluation of a set of playful computational activities for classrooms or code clubs, that balance the benefits of playfulness with sufficient rigor and structure to enable robust replication.Comment: 10 pages, 3 figure