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It is known that the minimum edge length convex partition MWCP of polygons with holes (an example of a PSLG) is NP-hard. Partitioning polygons with holes into the minimum number of convex polygons MNCP is also known to be NP-hard. We show that The MWCP and MNCP problem for general PSLGs where the sum of the hole vertices and re ex vertices inside the convex hull is sub-logarithmic can be solved in

We take a logical approach to threshold models , used to study the diffusion of e.g. new technologies or behaviors in social net-works. In short, threshold models consist of a network graph of agents connected by a social relationship and a threshold to adopt a possibly cascading behavior. Agents adopt new behavior when the proportion of their neighbors who have already adopted it meets the thresh

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Use of feedforward can alleviate feedback and adaptive actions. Feedforward signals can be generated from reference models and the same models can also be used as reference models in adaptive control. A method for designing the reference models is presented in the paper. By exploiting the structure of the equations describing air vehicles it is possible to find reference models that scale to the p

Popular Abstract in Swedish I takt med att vi översvämmas av kameror och bilder blir också tillämpningarna för automatiserad bildanalys allt större. Det kan handla om avancerade industrirobotar eller mobiltelefoner och syftet är allt från att rädda liv till att få en bra bild på barnbarnen. Den här avhandlingen fokuserar på två centrala problem inom fältet datorseende och bildanalys. Den första dThis thesis focuses on two problems in the field of computer vision and image analysis. The first part of the thesis deals with image localization. The goal is simply to answer the question: Where was this picture taken? To answer this two things are needed: A model of the world, or at least the relevant parts of the world, and a method for relating a new image to the model. The thesis presents ne

Diagnostic investigations with positron-emitting radiopharmaceuticals are dominated by (18)F-fluorodeoxyglucose ((18)F-FDG), but other radiopharmaceuticals are also commercially available or under development. Five of them, which are all clinically important, are (18)F-fluoride, (18)F-fluoroethyltyrosine ((18)F-FET), (18)F-deoxyfluorothymidine ((18)F-FLT), (18)F-fluorocholine ((18)F-choline) and (

Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syz

The 7th International Workshop on Virtual, Augmented, and Mixed Reality for Human-Robot Interaction (VAM-HRI) seeks to bring together researchers from human-robot interaction (HRI), robotics, and mixed reality (MR) to address the challenges related to mixed reality interactions between humans and robots. Key topics include the development of robots capable of interacting with humans in mixed reali

BACKGROUND: Recurrent stroke is a frequent, disabling event after ischemic stroke. This study compared the efficacy and safety of two antiplatelet regimens--aspirin plus extended-release dipyridamole (ASA-ERDP) versus clopidogrel.METHODS: In this double-blind, 2-by-2 factorial trial, we randomly assigned patients to receive 25 mg of aspirin plus 200 mg of extended-release dipyridamole twice daily

Technical development often precedes scientific breakthrough but can also pose new challenges to the scientific community. This is the case for Digital Spatial Profiling (DSP), where recent breakthroughs allow for collecting multi-plex spatial proteomic/transcriptomic data from tissue and it is prophesied a promising future in cancer research. A challenge, however, is handling its output data with

The goal of risk and vulnerability research is to reduce the harm done by disasters. A disaster is a combination of a natural hazard and a vulnerable society. Understanding vulnerability is vital to reduce disaster risk, or the potential of losses in property or life. Vulnerability is often divided into a technical, relating to buildings, infrastructure, and so forth, and a social which concerns t