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Krejci</title> <meta name="description" content="Search results for: Alois Krejci"> <meta name="keywords" content="Alois Krejci"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Alois Krejci"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 7</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Alois Krejci</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7</span> Identification of Dynamic Friction Model for High-Precision Motion Control</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Martin%20Goubej">Martin Goubej</a>, <a href="https://publications.waset.org/abstracts/search?q=Tomas%20Popule"> Tomas Popule</a>, <a href="https://publications.waset.org/abstracts/search?q=Alois%20Krejci"> Alois Krejci</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper deals with experimental identification of mechanical systems with nonlinear friction characteristics. Dynamic LuGre friction model is adopted and a systematic approach to parameter identification of both linear and nonlinear subsystems is given. The identification procedure consists of three subsequent experiments which deal with the individual parts of plant dynamics. The proposed method is experimentally verified on an industrial-grade robotic manipulator. Model fidelity is compared with the results achieved with a static friction model. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=mechanical%20friction" title="mechanical friction">mechanical friction</a>, <a href="https://publications.waset.org/abstracts/search?q=LuGre%20model" title=" LuGre model"> LuGre model</a>, <a href="https://publications.waset.org/abstracts/search?q=friction%20identification" title=" friction identification"> friction identification</a>, <a href="https://publications.waset.org/abstracts/search?q=motion%20control" title=" motion control"> motion control</a> </p> <a href="https://publications.waset.org/abstracts/51897/identification-of-dynamic-friction-model-for-high-precision-motion-control" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/51897.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">413</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">6</span> Investigation of Heat Affected Zone of Steel P92 Using the Thermal Cycle Simulator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Petr%20Mohyla">Petr Mohyla</a>, <a href="https://publications.waset.org/abstracts/search?q=Ivo%20Hlavat%C3%BD"> Ivo Hlavat媒</a>, <a href="https://publications.waset.org/abstracts/search?q=Ji%C5%99%C3%AD%20Hrub%C3%BD"> Ji艡铆 Hrub媒</a>, <a href="https://publications.waset.org/abstracts/search?q=Lucie%20Krej%C4%8D%C3%AD"> Lucie Krej膷铆</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work is focused on mechanical properties and microstructure of heat affected zone (HAZ) of steel P92. The thermal cycle simulator was used for modeling a fine grained zone of HAZ. Hardness and impact toughness were measured on simulated samples. Microstructural analysis using optical microscopy was performed on selected samples. Achieved results were compared with the values of a real welded joint. The thermal cycle simulator allows transferring the properties of very small HAZ to the sufficiently large sample where the tests of the mechanical properties can be performed. A satisfactory accordance was found when comparing the microstructure and mechanical properties of real welds and simulated samples. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=heat%20affected%20zone" title="heat affected zone">heat affected zone</a>, <a href="https://publications.waset.org/abstracts/search?q=impact%20test" title=" impact test"> impact test</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20cycle%20simulator" title=" thermal cycle simulator"> thermal cycle simulator</a>, <a href="https://publications.waset.org/abstracts/search?q=time%20of%20tempering" title=" time of tempering"> time of tempering</a> </p> <a href="https://publications.waset.org/abstracts/67694/investigation-of-heat-affected-zone-of-steel-p92-using-the-thermal-cycle-simulator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67694.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">302</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5</span> Knowledge Based Behaviour Modelling and Execution in Service Robotics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Suraj%20Nair">Suraj Nair</a>, <a href="https://publications.waset.org/abstracts/search?q=Aravindkumar%20Vijayalingam"> Aravindkumar Vijayalingam</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexander%20Perzylo"> Alexander Perzylo</a>, <a href="https://publications.waset.org/abstracts/search?q=Alois%20Knoll"> Alois Knoll</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the last decade robotics research and development activities have grown rapidly, especially in the domain of service robotics. Integrating service robots into human occupied spaces such as homes, offices, hospitals, etc. has become increasingly worked upon. The primary motive is to ease daily lives of humans by taking over some of the household/office chores. However, several challenges remain in systematically integrating such systems in human shared work-spaces. In addition to sensing and indoor-navigation challenges, programmability of such systems is a major hurdle due to the fact that the potential user cannot be expected to have knowledge in robotics or similar mechatronic systems. In this paper, we propose a cognitive system for service robotics which allows non-expert users to easily model system behaviour in an underspecified manner through abstract tasks and objects associated with them. The system uses domain knowledge expressed in the form of an ontology along with logical reasoning mechanisms to infer all the missing pieces of information required for executing the tasks. Furthermore, the system is also capable of recovering from failed tasks arising due to on-line disturbances by using the knowledge base and inferring alternate methods to execute the same tasks. The system is demonstrated through a coffee fetching scenario in an office environment using a mobile robot equipped with sensors and software capabilities for autonomous navigation and human-interaction through natural language. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cognitive%20robotics" title="cognitive robotics">cognitive robotics</a>, <a href="https://publications.waset.org/abstracts/search?q=reasoning" title=" reasoning"> reasoning</a>, <a href="https://publications.waset.org/abstracts/search?q=service%20robotics" title=" service robotics"> service robotics</a>, <a href="https://publications.waset.org/abstracts/search?q=task%20based%20systems" title=" task based systems"> task based systems</a> </p> <a href="https://publications.waset.org/abstracts/59980/knowledge-based-behaviour-modelling-and-execution-in-service-robotics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/59980.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">243</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">4</span> New Ethanol Method for Soft Tissue Imaging in Micro-CT</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Matej%20Patzelt">Matej Patzelt</a>, <a href="https://publications.waset.org/abstracts/search?q=Jan%20Dudak"> Jan Dudak</a>, <a href="https://publications.waset.org/abstracts/search?q=Frantisek%20Krejci"> Frantisek Krejci</a>, <a href="https://publications.waset.org/abstracts/search?q=Jan%20Zemlicka"> Jan Zemlicka</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20Musil"> Vladimir Musil</a>, <a href="https://publications.waset.org/abstracts/search?q=Jitka%20Riedlova"> Jitka Riedlova</a>, <a href="https://publications.waset.org/abstracts/search?q=Viktor%20Sykora"> Viktor Sykora</a>, <a href="https://publications.waset.org/abstracts/search?q=Jana%20Mrzilkova"> Jana Mrzilkova</a>, <a href="https://publications.waset.org/abstracts/search?q=Petr%20Zach"> Petr Zach</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Introduction: Micro-CT is well used for examination of bone structures and teeth. On the other hand visualization of the soft tissues is still limited. The goal of our study was to create a new fixation method for soft tissue imaging in micro-CT. Methodology: We used organs of 18 mice - heart, lungs, kidneys, liver and brain, which we fixated in ethanol after meticulous preparation. We fixated organs in different concentrations of ethanol and for different period of time. We used three types of ethanol concentration - 97%, 50% and ascending ethanol concentration (25%, 50%, 75%, 97% each for 12 hours). Fixated organs were scanned after 72 hours, 168 hours and 336 hours period of fixation. We scanned all specimens in micro-CT MARS (Medipix All Resolution System). Results: Ethanol method provided contrast enhancement in all studied organs in all used types of fixation. Fixation in 97% ethanol provided very fast fixation and the contrast among the tissues was visible already after 72 hours of fixation. Fixation for the period of 168 and 336 hours gave better details, especially in lung tissue, where alveoli were visualized. On the other hand, this type of fixation caused organs to petrify. Fixation in 50% ethanol provided best results in 336 hours fixation, details were visualized better than in 97% ethanol and samples were not as hard as in fixation in 97% ethanol. Best results were obtained in fixation in ascending ethanol concentration. All organs were visualized in great details, best-visualized organ was heart, where trabeculae and valves were visible. In this type of fixation, organs stayed soft for whole time. Conclusion: New ethanol method is a great option for soft tissue fixation as well as the method for enhancing contrast among tissues in organs. The best results were obtained with fixation of the organs in ascending ethanol concentration, the best visualized organ was the heart. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=x-ray%20imaging" title="x-ray imaging">x-ray imaging</a>, <a href="https://publications.waset.org/abstracts/search?q=small%20animals" title=" small animals"> small animals</a>, <a href="https://publications.waset.org/abstracts/search?q=ethanol" title=" ethanol"> ethanol</a>, <a href="https://publications.waset.org/abstracts/search?q=ex-vivo" title=" ex-vivo"> ex-vivo</a> </p> <a href="https://publications.waset.org/abstracts/47376/new-ethanol-method-for-soft-tissue-imaging-in-micro-ct" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47376.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">321</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">3</span> An Inquiry on Imaging of Soft Tissues in Micro-Computed Tomography</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Matej%20Patzelt">Matej Patzelt</a>, <a href="https://publications.waset.org/abstracts/search?q=Jana%20Mrzilkova"> Jana Mrzilkova</a>, <a href="https://publications.waset.org/abstracts/search?q=Jan%20Dudak"> Jan Dudak</a>, <a href="https://publications.waset.org/abstracts/search?q=Frantisek%20Krejci"> Frantisek Krejci</a>, <a href="https://publications.waset.org/abstracts/search?q=Jan%20Zemlicka"> Jan Zemlicka</a>, <a href="https://publications.waset.org/abstracts/search?q=Zdenek%20Wurst"> Zdenek Wurst</a>, <a href="https://publications.waset.org/abstracts/search?q=Petr%20Zach"> Petr Zach</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20Musil"> Vladimir Musil</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Introduction: Micro-CT is well used for examination of bone structures and teeth. On the other hand visualization of the soft tissues is still limited. The goal of our study was to elaborate methodology for soft tissue samples imaging in micro-CT. Methodology: We used organs of rats and mice. We either did a preparation of the organs and fixation in contrast solution or we did cannulation of blood vessels and their injection for imaging of the vascular system. First, we scanned native specimens, then we created corrosive specimens by resins. In the next step, we injected vascular system either by Aurovist contrast agent or by Exitron. In the next step, we focused on soft tissues contrast increase. We scanned samples fixated in Lugol solution, samples fixated in pure ethanol and in formaldehyde solution. All used methods were afterwards compared. Results: Native specimens did not provide sufficient contrast of the tissues in any of organs. Corrosive samples of the blood stream provided great contrast and details; on the other hand, it was necessary to destroy the organ. Further examined possibility was injection of the AuroVist contrast that leads to the great bloodstream contrast. Injection of Exitron contrast agent comparing to Aurovist did not provide such a great contrast. The soft tissues (kidney, heart, lungs, brain, and liver) were best visualized after fixation in ethanol. This type of fixation showed best results in all studied tissues. Lugol solution had great results in muscle tissue. Fixation by formaldehyde solution showed similar quality of contrast in the tissues like ethanol. Conclusion: Before imaging, we need to, first, determinate which structures of the soft tissues we want to visualize. In the case of the bloodstream, the best was AuroVist and corrosive specimens. Muscle tissue is best visualized by Lugol solution. In the case of the organs containing cavities, like kidneys or brain, the best way was ethanol fixation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=experimental%20imaging" title="experimental imaging">experimental imaging</a>, <a href="https://publications.waset.org/abstracts/search?q=fixation" title=" fixation"> fixation</a>, <a href="https://publications.waset.org/abstracts/search?q=micro-CT" title=" micro-CT"> micro-CT</a>, <a href="https://publications.waset.org/abstracts/search?q=soft%20tissues" title=" soft tissues"> soft tissues</a> </p> <a href="https://publications.waset.org/abstracts/51423/an-inquiry-on-imaging-of-soft-tissues-in-micro-computed-tomography" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/51423.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">325</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2</span> Using The Flight Heritage From >150 Electric Propulsion Systems To Design The Next Generation Field Emission Electric Propulsion Thrusters</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=David%20Krejci">David Krejci</a>, <a href="https://publications.waset.org/abstracts/search?q=Tony%20Sch%C3%B6nherr"> Tony Sch枚nherr</a>, <a href="https://publications.waset.org/abstracts/search?q=Quirin%20Koch"> Quirin Koch</a>, <a href="https://publications.waset.org/abstracts/search?q=Valentin%20Hugonnaud"> Valentin Hugonnaud</a>, <a href="https://publications.waset.org/abstracts/search?q=Lou%20Grimaud"> Lou Grimaud</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexander%20Reissner"> Alexander Reissner</a>, <a href="https://publications.waset.org/abstracts/search?q=Bernhard%20Seifert"> Bernhard Seifert</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In 2018 the NANO thruster became the first Field Emission Electric Propulsion (FEEP) system ever to be verified in space in an In-Orbit Demonstration mission conducted together with Fotec. Since then, 160 additional ENPULSION NANO propulsion systems have been deployed in orbit on 73 different spacecraft across multiple customers and missions. These missions included a variety of different satellite bus sizes ranging from 3U Cubesats to >100kg buses, and different orbits in Low Earth Orbit and Geostationary Earth orbit, providing an abundance of on orbit data for statistical analysis. This large-scale industrialization and flight heritage allows for a holistic way of gathering data from testing, integration and operational phases, deriving lessons learnt over a variety of different mission types, operator approaches, use cases and environments. Based on these lessons learnt a new generation of propulsion systems is developed, addressing key findings from the large NANO heritage and adding new capabilities, including increased resilience, thrust vector steering and increased power and thrust level. Some of these successor products have already been validated in orbit, including the MICRO R3 and the NANO AR3. While the MICRO R3 features increased power and thrust level, the NANO AR3 is a successor of the heritage NANO thruster with added thrust vectoring capability. 5 NANO AR3 have been launched to date on two different spacecraft. This work presents flight telemetry data of ENPULSION NANO systems and onorbit statistical data of the ENPULSION NANO as well as lessons learnt during onorbit operations, customer assembly, integration and testing support and ground test campaigns conducted at different facilities. We discuss how transfer of lessons learnt and operational improvement across independent missions across customers has been accomplished. Building on these learnings and exhaustive heritage, we present the design of the new generation of propulsion systems that increase the power and thrust level of FEEP systems to address larger spacecraft buses. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=FEEP" title="FEEP">FEEP</a>, <a href="https://publications.waset.org/abstracts/search?q=field%20emission%20electric%20propulsion" title=" field emission electric propulsion"> field emission electric propulsion</a>, <a href="https://publications.waset.org/abstracts/search?q=electric%20propulsion" title=" electric propulsion"> electric propulsion</a>, <a href="https://publications.waset.org/abstracts/search?q=flight%20heritage" title=" flight heritage"> flight heritage</a> </p> <a href="https://publications.waset.org/abstracts/167767/using-the-flight-heritage-from-150-electric-propulsion-systems-to-design-the-next-generation-field-emission-electric-propulsion-thrusters" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167767.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">90</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Bio-Psycho-Social Consequences and Effects in Fall-Efficacy Scale in Seniors Using Exercise Intervention of Motor Learning According to Yoga Techniques</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Milada%20Krejci">Milada Krejci</a>, <a href="https://publications.waset.org/abstracts/search?q=Martin%20Hill"> Martin Hill</a>, <a href="https://publications.waset.org/abstracts/search?q=Vaclav%20Hosek"> Vaclav Hosek</a>, <a href="https://publications.waset.org/abstracts/search?q=Dobroslava%20Jandova"> Dobroslava Jandova</a>, <a href="https://publications.waset.org/abstracts/search?q=Jiri%20Kajzar"> Jiri Kajzar</a>, <a href="https://publications.waset.org/abstracts/search?q=Pavel%20Blaha"> Pavel Blaha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The paper declares effects of exercise intervention of the research project “Basic research of balance changes in seniors”, granted by the Czech Science Foundation. The objective of the presented study is to define predictors, which influence bio-psycho-social consequences and effects of balance ability in senior 65 years old and above. We focused on the Fall-Efficacy Scale changes evaluation in seniors. Comprehensive hypothesis of the project declares, that motion uncertainty (dyskinesia) can negatively affect the well-being of a senior in bio-psycho-social context. In total, random selection and testing of 100 seniors (30 males, 70 females) from Prague and Central Bohemian region was provided. The sample was divided by stratified random selection into experimental and control groups, who underwent input and output testing. For diagnostics the methods of Medical Anamnesis, Functional anthropological examinations, Tinetti Balance Assessment Tool, SF-36 Health Survey, Anamnestic comparative self-assessment scale were used. Intervention method called "Life in Balance" based on yoga techniques was applied in four-week cycle. Results of multivariate regression were verified by repeated measures ANOVA: subject factor, phase of intervention (between-subject factor), body fluid (within-subject factor) and phase of intervention × body fluid interaction). ANOVA was performed with a repetition involving the factors of subjects, experimental/control group, phase of intervention (independent variable), and x phase interaction followed by Bonferroni multiple comparison assays with a test strength of at least 0.8 on the probability level p < 0.05. In the paper results of the first-year investigation of the three years running project are analysed. Results of balance tests confirmed no significant difference between females and males in pre-test. Significant improvements in balance and walking ability were observed in experimental group in females comparing to males (F = 128.4, p < 0.001). In the females control group, there was no significant change in post- test, while in the female experimental group positive changes in posture and spine flexibility in post-tests were found. It seems that females even in senior age react better to incentives of intervention in balance and spine flexibility. On the base of results analyses, we can declare the significant improvement in social balance markers after intervention in the experimental group (F = 10.5, p < 0.001). In average, seniors are used to take four drugs daily. Number of drugs can contribute to allergy symptoms and balance problems. It can be concluded that static balance and walking ability of seniors according Tinetti Balance scale correlate significantly with psychic and social monitored markers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=exercises" title="exercises">exercises</a>, <a href="https://publications.waset.org/abstracts/search?q=balance" title=" balance"> balance</a>, <a href="https://publications.waset.org/abstracts/search?q=seniors%2065%2B" title=" seniors 65+"> seniors 65+</a>, <a href="https://publications.waset.org/abstracts/search?q=health" title=" health"> health</a>, <a href="https://publications.waset.org/abstracts/search?q=mental%20and%20social%20balance" title=" mental and social balance"> mental and social balance</a> </p> <a 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