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[citace_text] => PAN, S., CHEN, K.; VĚCHET, S. Design and Control of an Active Stage for Suppressing Motion Induced Vibration in Optical Inspection Systems. In 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen: 2022. p. 1-6. ISBN: 978-1-6654-1040-3.
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[citace_text] => VLAŠIC, F.; MOHAMMAD, H. Dynamická simulace nově navržených drážek dveřního mechanismu pro ovladače var. B. Brno: 2022. s. 1-9.
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[nazev] => Vertebral Slip Morphology in Dysplastic Spondylolisthesis as a Criterion for the Choice of the L5/S1 Support (ALIF, PLIF, Fibular Graft) in Surgical Treatment
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[popis] => Dysplastic spondylolisthesis is a severe pathological condition, based on dysplastic changes in the lumbosacral part of the spine, that causes the asymmetry of the lumbosacral junction. The appropriate therapeutic algorithm remains controversial. As the gold standard, the surgical reposition of the slipped vertebra and 360 degrees fusion of the affected spinal segment is preferred. Thirty-two patients were operated on between the years 2005 and 2018. Different techniques of 360 degrees fusion, based on the severity of the displacement of the affected vertebral segment, were used. Herein, the advantages and disadvantages of different techniques of interbody fusion are discussed. The slippage and retention after reduction in the vertebrae are evaluated prior to the operation, postoperatively, one year after the surgery, and during follow-up, which was 7 years on average (minimum 2 years for a follow-up). Complications associated with the surgery are evaluated, in addition to the operation time, blood loss, spinopelvic parameters, and patient satisfaction with the surgery. All surgical techniques improved the slippage compared to preoperative conditions. The retention of the reposition was not changed significantly in postoperative controls. The incidence of neurological complications reached 12.5%. Surgical treatment is the only treatment option that successfully addressed the pathological principle of dysplastic spondylolisthesis. All of the surgical methods used led to restoring the symmetry of the lumbar spine, and to the improvement in both radiological parameters and the alleviation of subjective difficulties. The aim of this article is to summarize surgical methods in patients having dysplastic spondylolisthesis with a slip of more than 25%, who were operated on, and to determine the optimal treatment algorithm according to the severity of the slip.
[popis_orig] => Dysplastic spondylolisthesis is a severe pathological condition, based on dysplastic changes in the lumbosacral part of the spine, that causes the asymmetry of the lumbosacral junction. The appropriate therapeutic algorithm remains controversial. As the gold standard, the surgical reposition of the slipped vertebra and 360 degrees fusion of the affected spinal segment is preferred. Thirty-two patients were operated on between the years 2005 and 2018. Different techniques of 360 degrees fusion, based on the severity of the displacement of the affected vertebral segment, were used. Herein, the advantages and disadvantages of different techniques of interbody fusion are discussed. The slippage and retention after reduction in the vertebrae are evaluated prior to the operation, postoperatively, one year after the surgery, and during follow-up, which was 7 years on average (minimum 2 years for a follow-up). Complications associated with the surgery are evaluated, in addition to the operation time, blood loss, spinopelvic parameters, and patient satisfaction with the surgery. All surgical techniques improved the slippage compared to preoperative conditions. The retention of the reposition was not changed significantly in postoperative controls. The incidence of neurological complications reached 12.5%. Surgical treatment is the only treatment option that successfully addressed the pathological principle of dysplastic spondylolisthesis. All of the surgical methods used led to restoring the symmetry of the lumbar spine, and to the improvement in both radiological parameters and the alleviation of subjective difficulties. The aim of this article is to summarize surgical methods in patients having dysplastic spondylolisthesis with a slip of more than 25%, who were operated on, and to determine the optimal treatment algorithm according to the severity of the slip.
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[citace_html] => VYSKOČIL, R.; PRYMEK, M.; RYBA, L.; SKLENSKY, J.; KOCANDA, J.; LUJC, M.; VOSYNEK, P.; REPKO, M. Vertebral Slip Morphology in Dysplastic Spondylolisthesis as a Criterion for the Choice of the L5/S1 Support (ALIF, PLIF, Fibular Graft) in Surgical Treatment. Symmetry-Basel, 2022, vol. 14, no. 7, 14 p. ISSN: 2073-8994.
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title="Vertebral Slip Morphology in Dysplastic Spondylolisthesis as a Criterion for the Choice of the L5/S1 Support (ALIF, PLIF, Fibular Graft) in Surgical Treatment",
journal="Symmetry-Basel",
year="2022",
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number="7",
pages="14",
doi="10.3390/sym14071466",
url="https://www.mdpi.com/2073-8994/14/7/1466"
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[popis_en] => Dysplastic spondylolisthesis is a severe pathological condition, based on dysplastic changes in the lumbosacral part of the spine, that causes the asymmetry of the lumbosacral junction. The appropriate therapeutic algorithm remains controversial. As the gold standard, the surgical reposition of the slipped vertebra and 360 degrees fusion of the affected spinal segment is preferred. Thirty-two patients were operated on between the years 2005 and 2018. Different techniques of 360 degrees fusion, based on the severity of the displacement of the affected vertebral segment, were used. Herein, the advantages and disadvantages of different techniques of interbody fusion are discussed. The slippage and retention after reduction in the vertebrae are evaluated prior to the operation, postoperatively, one year after the surgery, and during follow-up, which was 7 years on average (minimum 2 years for a follow-up). Complications associated with the surgery are evaluated, in addition to the operation time, blood loss, spinopelvic parameters, and patient satisfaction with the surgery. All surgical techniques improved the slippage compared to preoperative conditions. The retention of the reposition was not changed significantly in postoperative controls. The incidence of neurological complications reached 12.5%. Surgical treatment is the only treatment option that successfully addressed the pathological principle of dysplastic spondylolisthesis. All of the surgical methods used led to restoring the symmetry of the lumbar spine, and to the improvement in both radiological parameters and the alleviation of subjective difficulties. The aim of this article is to summarize surgical methods in patients having dysplastic spondylolisthesis with a slip of more than 25%, who were operated on, and to determine the optimal treatment algorithm according to the severity of the slip.
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[popis] => A novel 3D localization scheme has been proposed for smart living or computer animation applications. This scheme utilizes two CMOS IR sensors originally used for Nintendo wiimote for performing stereo range finding on IR LEDs. Essential kinematics relations are developed to transform the detected pixel information into 3D spatial coordinates of IR LEDs. The sensing distance can be up to 3-4 meters and the localization scattering is characterized between 0.5 and 5 cm, depended on the sensing distance under proper setup. Such performance could actually satisfy the requirement in coarse navigation and motion planning of indoor mobile devices. Meanwhile, an Arduino-based IR LED switching technique for breaking the constraint on available Bluetooth communication channels is also proposed and implemented. By controlling the switching of IR LED units sequentially, the equivalent available channels can be extended with a tradeoff in system bandwidth. This 3D localization system can detect more IR LEDs than the number of original channels and each IR LED can be identified correctly even if it passes through a shelter. Several testing systems are setup for evaluating the performance on the 3D localization and the IR LED switching control, as well as for demonstrating the application potentials. The preliminary results indicate that the position of IR LEDs can be identified with sufficient accuracy and the system can also simultaneously detect more IR LEDs than the original limitation. With proper arrangement in deployment, it is possible to further increase the sensing zone to cover the entire indoor living space. This novel localization system is thus expected to have a great potential on applications such as mobile robots monitoring or human motion capture for animations. (C) 2021 Elsevier B.V. All rights reserved.
[popis_orig] => A novel 3D localization scheme has been proposed for smart living or computer animation applications. This scheme utilizes two CMOS IR sensors originally used for Nintendo wiimote for performing stereo range finding on IR LEDs. Essential kinematics relations are developed to transform the detected pixel information into 3D spatial coordinates of IR LEDs. The sensing distance can be up to 3-4 meters and the localization scattering is characterized between 0.5 and 5 cm, depended on the sensing distance under proper setup. Such performance could actually satisfy the requirement in coarse navigation and motion planning of indoor mobile devices. Meanwhile, an Arduino-based IR LED switching technique for breaking the constraint on available Bluetooth communication channels is also proposed and implemented. By controlling the switching of IR LED units sequentially, the equivalent available channels can be extended with a tradeoff in system bandwidth. This 3D localization system can detect more IR LEDs than the number of original channels and each IR LED can be identified correctly even if it passes through a shelter. Several testing systems are setup for evaluating the performance on the 3D localization and the IR LED switching control, as well as for demonstrating the application potentials. The preliminary results indicate that the position of IR LEDs can be identified with sufficient accuracy and the system can also simultaneously detect more IR LEDs than the original limitation. With proper arrangement in deployment, it is possible to further increase the sensing zone to cover the entire indoor living space. This novel localization system is thus expected to have a great potential on applications such as mobile robots monitoring or human motion capture for animations. (C) 2021 Elsevier B.V. All rights reserved.
[klicova_slova] => IR CMOS sensors; 3D localization; Arduino-based IR LED control; Robot positioning
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[nazev_en] => Development and demonstration of indoor three-dimensional localization using IR CMOS sensors for Mobile manipulators
[popis_en] => A novel 3D localization scheme has been proposed for smart living or computer animation applications. This scheme utilizes two CMOS IR sensors originally used for Nintendo wiimote for performing stereo range finding on IR LEDs. Essential kinematics relations are developed to transform the detected pixel information into 3D spatial coordinates of IR LEDs. The sensing distance can be up to 3-4 meters and the localization scattering is characterized between 0.5 and 5 cm, depended on the sensing distance under proper setup. Such performance could actually satisfy the requirement in coarse navigation and motion planning of indoor mobile devices. Meanwhile, an Arduino-based IR LED switching technique for breaking the constraint on available Bluetooth communication channels is also proposed and implemented. By controlling the switching of IR LED units sequentially, the equivalent available channels can be extended with a tradeoff in system bandwidth. This 3D localization system can detect more IR LEDs than the number of original channels and each IR LED can be identified correctly even if it passes through a shelter. Several testing systems are setup for evaluating the performance on the 3D localization and the IR LED switching control, as well as for demonstrating the application potentials. The preliminary results indicate that the position of IR LEDs can be identified with sufficient accuracy and the system can also simultaneously detect more IR LEDs than the original limitation. With proper arrangement in deployment, it is possible to further increase the sensing zone to cover the entire indoor living space. This novel localization system is thus expected to have a great potential on applications such as mobile robots monitoring or human motion capture for animations. (C) 2021 Elsevier B.V. All rights reserved.
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[popis] => Technické řešení si klade za úkol navrhnout ložiskový uzel pro vysokootáčkový rotor radiálního čerpadla určeného zejména pro dopravu kapalného kyslíku do spalovacího prostoru raketového nosiče, a to při zachování žádoucí tuhosti uložení rotoru a spolehlivosti při všech provozních režimech.
[popis_orig] => Technické řešení si klade za úkol navrhnout ložiskový uzel pro vysokootáčkový rotor radiálního čerpadla určeného zejména pro dopravu kapalného kyslíku do spalovacího prostoru raketového nosiče, a to při zachování žádoucí tuhosti uložení rotoru a spolehlivosti při všech provozních režimech.
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author="Tomáš {Návrat} and Jan {Pokorný} and Michal {Popelka} and Ondřej {Pavlík} and Michal {Vajdák}",
title="Ložiskový uzel pro vysokootáčkový rotor radiálního čerpadla s integrovaným pohonem",
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note="Utility model"
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[popis] => Despite many studies confirming that roller pumps are more suitable for cardiovascular bypasses or extracorporeal membrane oxygenation sessions than centrifugal flow pumps, they do not reach their potential, mainly due to unpredictable pressure pulsations causing negative effects on the vessels and organs. The aim of this research is to create a dynamic model of a hydraulic system consisting of a peristaltic pump connected to an arterial tree. Conventional methods of modelling such systems use computationally intensive Computational fluid dynamics (CFD) or Fluid-structure interaction (FSI) simulations and are usually designed to analyze the properties of such mechanisms. Such models do not allow the control of the system in real time, and therefore it is reasonable to create a simplified mathematical model that allows feedback adaptive control of the outlet pressure depending on the parameters of the system. This newly created model can be used to design a controller for the speed of the pump to achieve a physiologically relevant pressure wave. Model was verified on a physical plant consisting of a stepper motor-driven pump with an arterial tree made of silicone tubes that simulates the resistance of the vascular circulation.
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[klicova_slova] => electro-hydraulic analogy; Peristaltic pump; pressure waveform
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title="Dynamic model of peristaltic pump with arterial tree for real-time pressure waveform control",
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year="2022",
pages="6",
publisher="Institute of Electrical and Electronics Engineers Inc.",
address="Plzeň",
doi="10.1109/ME54704.2022.9982882",
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[popis] => Smart Wheelchairs (SWC) are vehicles designed specifically for people with certain mobility impairments to alleviate their difficulties in movement and interaction with their surroundings. In this paper, we focus on enhancing the obstacle avoidance capabilities of a SWC previously built at the University of Malta and also propose novel algorithms that can be employed on any other autonomous mobile robot. The improvements include the design, implementation and experimental validation of a novel path planner developed specifically for semi-autonomous movement. In this control mode, the only user input is the desired direction of movement. Our approach combines and improves elements of the Vector Field Histogram + (VFH+) and Dynamic Window Approach (DWA) algorithms. Simulations and physical experiments are used to validate and compare the proposed algorithm. To complement the obstacle avoidance capabilities of the local path planner, a new geometrical method is also presented for the detection of negative obstacles, such as holes and stairs.
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[klicova_slova_orig] => DWA; obstacle avoidance; semi-autonomous mode; smart wheelchair; VFH+; VFH+DWA
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