48 research outputs found
Streamlining collection of training samples for object detection and classification in video
Copyright 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This is the accepted version of the article. The published version is available at
A planner for All-Terrain Vehicles on unknown rough terrains based on the MPC paradigm and D*-like algorithm
A novel conceptual design of a planner for a mobile vehicle, operating on poorly traversable unknown rough terrains, is discussed. Finding a way to include a vehicle model into the planning stage, while coping with unknown or partially known terrains, is a challenging and rarely addressed optimization setup. The main advantages of a possible solution of such a problem would be twofold. First, the planner would give trajectories which are feasible to follow by the vehicle, which is not the case in many other state of the art planning algorithms especially for large vehicle speeds. Second, those trajectories would be the optimal ones in accordance to the current vehicle states and knowledge on its environment.
We propose a solution based on an MPC planning paradigm, wherein the planner solves a constrained optimal control problem at each time instant using the current knowledge on the terrain, which is caught appropriately by an objective function. Solving an optimal control problem allows for the vehicle model being included into the planning stage, while the repeated optimization allows for taking continuously into account new terrain information. To deal with the information given beyond the sensor range and to guarantee reaching a given goal position, we have adopted a Dā-like algorithm for rough terrains being used as a cost-to-go term within the optimization setup
Spatially-resolved potential measurement with ion crystals
We present a method to measure potentials over an extended region using
one-dimensional ion crystals in a radio frequency (RF) ion trap. The
equilibrium spacings of the ions within the crystal allow the determination of
the external forces acting at each point. From this the overall potential, and
also potentials due to specific trap features, are calculated. The method can
be used to probe potentials near proximal objects in real time, and can be
generalized to higher dimensions.Comment: 7 pages (double spaced), 3 figure
Stres na radu i zdravlje medicinskih sestara u jedinicama intenzivne njege u Srbiji
The aim of this study was to identify and analyse professional stressors, evaluate the level of stress in nurses in Intensive Care Units (ICU), and assess the correlation between the perception of stress and psychological and somatic symptoms or diseases shown by nurses. The research, designed as a crosssectional study, was carried out in the Intensive Care Units (ICU), in health centres in Serbia. The sample population encompassed 1000 nurses. Expanded Nursing Stress Scale (ENSS) was used as the research instrument. ENSS revealed a valid metric characteristic within our sample population. Nurses from ICUs rated situations involving physical and psychological working environments as the most stressful ones, whereas situations related to social working environment were described as less stressful; however, the differences in the perception of stressfulness of these environments were minor. Socio-demographic determinants of the participants (age, marital status and education level) significantly affected the perception of stress at work. Significant differences in the perception of stressfulness of particular stress factors were observed among nurses with respect to psychological and somatic symptoms (such as headache, insomnia, fatigue, despair, lower back pain, mood swings etc.) and certain diseases (such as hypertension, myocardial infarction, stroke, diabetes mellitus etc). In view of permanent escalation of professional stressors, creating a supportive working environment is essential for positive health outcomes, prevention of job-related diseases and better protection of already ill nurses.Cilj je ovoga rada bio identifi cirati i analizirati profesionalne stresore, procijeniti razinu stresa kod medicinskih sestara u jedinicama intenzivne njege te procijeniti korelaciju izmeÄu percepcije stresa i prisutnosti psiholoÅ”kih i somatskih simptoma ili bolesti kod medicinskih sestara. Istraživanje je provedeno u obliku studije presjeka u Jedinicama intenzivne njege u zdravstvenim centrima u Srbiji. Uzorak se sastojao od 1000 medicinskih sestara-tehniÄara. Za procjenu i analizu profesionalnih stresora koriÅ”ten je upitnik Expanded Nursing Stress Scale (ENSS), koji je pokazao validne metrijske karakteristike na naÅ”oj ispitanoj populaciji. Medicinske sestre u Jedinicama intenzivne njege ocijenile su situacije iz fiziÄkoga i psiholoÅ”koga radnog okruženja kao izrazito optereÄujuÄe, a situacije iz socijalnoga radnog okruženja kao manje optereÄujuÄe. Razlika u percepciji stresogenosti navedenih radnih okruženja nije bila statistiÄki znaÄajna. Sociodemografske determinante ispitanika (dob, braÄno stanje i stupanj obrazovanja) znaÄajno utjeÄu na percepciju stresa na radnom mjestu. UtvrÄena je statistiÄki znaÄajna razlika u opažanju stresogenosti pojedinih stresnih situacija na radnom mjestu izmeÄu medicinskih sestara u odnosu na postojanje psihosomatskih simptoma (kao Å”to su glavobolja, nesanica, umor, oÄaj, bol u leÄima, Äeste promjene raspoloženja) ili odreÄenih bolesti (kao Å”to su poviÅ”ena hipertenzija, infarkt miokarda, cerebrovaskularni inzult, Å”eÄerna bolest). Zbog sve izraženije prisutnosti profesionalnih stresora nužno je poduzeti odreÄene strateÅ”ke mjere kod medicinskih sestara u Jedinicama intenzivne njege. StrateÅ”ke mjere podrazumijevaju unaprjeÄenje psihosocijalne radne klime, Å”to bi unaprijedilo njihovo zdravlje i sprijeÄilo nastanak bolesti u svezi s radom, ali i omoguÄilo bolju zaÅ”titu veÄ oboljelim medicinskim sestrama
Self-reported medication adherence in older patients
European Society of Clinical Pharmacy International Workshop on Malabsorption and Malnutrition, A Challenge for Clinical Pharmacists, 26ā27 April 202
Oxidative stress response in neural stem cells exposed to different superparamagnetic iron oxide nanoparticles
Igor M Pongrac,1 Ivan PaviÄiÄ,2 Mirta MiliÄ,2 Lada BrkiÄ Ahmed,1 Michal BabiÄ,3 Daniel Horák,3 Ivana VinkoviÄ VrÄek,2 SreÄko GajoviÄ1 1School of Medicine, Croatian Institute for Brain Research, University of Zagreb, 2Institute for Medical Research and Occupational Health, Zagreb, Croatia; 3Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic Abstract: Biocompatibility, safety, and risk assessments of superparamagnetic iron oxide nanoparticles (SPIONs) are of the highest priority in researching their application in biomedicine. One improvement in the biological properties of SPIONs may be achieved by different functionalization and surface modifications. This study aims to investigate how a different surface functionalization of SPIONs – uncoated, coated with D-mannose, or coated with poly-L-lysine – affects biocompatibility. We sought to investigate murine neural stem cells (NSCs) as important model system for regenerative medicine. To reveal the possible mechanism of toxicity of SPIONs on NSCs, levels of reactive oxygen species, intracellular glutathione, mitochondrial membrane potential, cell-membrane potential, DNA damage, and activities of SOD and GPx were examined. Even in cases where reactive oxygen species levels were significantly lowered in NSCs exposed to SPIONs, we found depleted intracellular glutathione levels, altered activities of SOD and GPx, hyperpolarization of the mitochondrial membrane, dissipated cell-membrane potential, and increased DNA damage, irrespective of the surface coating applied for SPION stabilization. Although surface coating should prevent the toxic effects of SPIONs, our results showed that all of the tested SPION types affected the NSCs similarly, indicating that mitochondrial homeostasis is their major cellular target. Despite the claimed biomedical benefits of SPIONs, the refined determination of their effects on various cellular functions presented in this work highlights the need for further safety evaluations. This investigation helps to fill the knowledge gaps on the criteria that should be considered in evaluating the biocompatibility and safety of novel nanoparticles. Keywords: superparamagnetic iron oxide nanoparticles, biocompatibility, oxidative stress, genotoxicity, murine neural stem cell
Alignment and Proficiency of Virgin Olive Oil Sensory Panels: The OLEUM Approach
Final version is available in open access in publisherās site.-- This abstract is based on the published article Barbieri, S.; BrkiÄ Bubola, K.; Bendini, A.; BuÄar-MiklavÄiÄ, M.; Lacoste, F.; Tibet, U.; Winkelmann, O.; GarcĆa-GonzĆ”lez, D.L.; Gallina Toschi, T. Alignment and Proficiency of Virgin Olive Oil Sensory Panels: The OLEUM Approach. Foods 2020, 9, 355. https://doi.org/10.3390/foods9030355.-- http://hdl.handle.net/10261/205590Peer reviewe