On the Subsystem Level Gain Scheduled Controller Design for MIMO Systems

Vojtech Veselý 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2

This paper presents a unique approach to design in the frequency domain a gain scheduled controller (GSC) to nonlinear Lipschitz MIMO system model. The proposed design procedure is based on the Method of Equivalent subsystems and Integral Quadratic Constraints-Small Gain Theory. The feasible design procedures provide a subsystem equivalent frequency characteristic and frequency design method to obtain design procedure for GSC design. The obtained design results and their properties are illustrated in the simultaneously design of controllers for nonlinear turbogenerator model (6-order). The results of the obtained design procedure are a PI automatic gain scheduled voltage regulator (AVR) for synchronous generator, and a PI governor gain scheduled controller.

Prebiotic Effects of a Novel Combination of Galactooligosaccharides and Maltodextrins

Sarka Musilova,Vojtech Rada,Milan Marounek,Jiri Nevoral,Dagmar Duskova,Vera Bunesova,Eva Vlkova,Richard Zelenka 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.6

Prebiotics are used for stimulating the growth of beneficial microorganisms in the gut. However, it is very difficult to find a suitable prebiotic mixture that exclusively supports the growth of beneficial microbes such as bifidobacteria and lactobacilli. We tested the effects of a prebiotic mixture in vitro by incubating it with fecal samples and in vivo by administration of the prebiotic supplement to healthy adult volunteers, followed by analysis of their fecal microbiota. The effect of the oligosaccharides on bacterial metabolism was studied by analyzing short-chain fatty acid (SCFA) production in vitro and the SCFA pattern for the stool samples of volunteers. In the in vitro test, a higher proportion of bifidobacteria (25.77%) was seen in the total bacterial population after cultivation on a prebiotic mixture than on the control medium (7.94%). The gram-negative anaerobe count significantly decreased from 8.70 to 6.40 log CFU/g (from 35.21% to 0.60%) and the Escherichia coli count decreased from 7.41 to 6.27 log CFU/g (from 1.78% to 0.44%). Administration of a prebiotic mixture in vivo (9 g of galactooligosaccharides [GOS] + 1 g of maltodextrins; daily for 5 days) significantly increased the fecal bifidobacterial count from 9.45 to 9.83 log CFU/g (from 40.80% to 53.85% of total bacteria) and reduced the E. coli count from 7.23 to 6.28 log CFU/g (from 55.35% to 45.06% of total bacteria). The mixture comprising GOS and maltodextrins thus exhibited bifidogenic properties, promoting the performance of bifidobacteria by boosting their growth and inhibiting the growth of undesirable bacteria.

V2H control system software analysis and design

Martin Kosinka,Zdenek Slanina,Michal Petruzela,Vojtech Blazek 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10

Vehicle To Home systems make it possible to connect smart homes with electric vehicles and draw electricity, in the event of a shortage in the smart home, or to store surpluses obtained from, for example, a solar power plant back into the electric car. To control the exchange, it is necessary to implement several basic algorithms that would allow to maintain the required amount of energy to reach the charging station, or to work. This article describes the analysis and partial implementation of control software for the Raspberry Pi platform.

Control system for V2H applications

Martin Kosinka,Zdenek Slanina,Michal Petruzela,Vojtech Blazek 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10

The article deals with the design and implementation of a control unit for energy flow management in Vehicle To Home systems. Vehicle To Home systems use energy from an electric car battery to power a smart home and store excess energy back into the electric vehicle’s battery. A car with a Chademo interface was chosen for the tests. The designed control unit consists of a single-board computer Raspberry Pi 3B +, a designed printed circuit board and an electricity meter with communication via Modbus protocol. The control unit connects the superior system of the smart house, the battery management system and the developed two-way converter enabling the connection of the electric vehicle to the energy infrastructure of the smart house.

Electronic Structure Mapping of Branching States in Poly[methyl(phenyl)silane] Upon Exposure to UV Radiation

Frantiˇsek Schauer,Luk´aˇs Tk´aˇ,Miroslava Oˇzvoldov´,Vojtech Nad´aˇzdy,Katar´ana Gmucov´a,Karol V´egs¨,Miroslava Tk´aˇcov´,Juraj Chlp´ık 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.4

The origin of white photoluminescence in polysilanes has long been disputed, and this emission is closely connected with information recording in nanotechnologies. We elucidated UV degradation of an archetypal model polymer poly[methyl(phenyl)silane] by using a new method for electronic structure mapping of organic semiconductors, energy-resolved electrochemical impedance spectroscopy (ER-EIS) and photoluminescence spectroscopy. UV exposure at 345 nm resulted in two defect bands above the highest occupied molecular orbital (HOMO) in the energy region from −5.5 eV to −3.5 eV with respect to the zero vacuum energy level. The respective density of states was 1016 − 1017 cm−3eV−1, and the total integrated concentration was 0 − 1017 cm−3. The photoluminescence in the long-wavelength region gave wide bands with photon energies from 2.2 eV to 3.2 eV (corresponding to wavelengths from 600 nm to 390 nm). The observed bands were interpreted by assuming the formation of energetically distributed Si branching radiative states, whose distribution in the HOMO − lowest unoccupied molecular orbital (LUMO) gap was observed by using ER-EIS. The quantum efficiency of defect state formation increased from (x)345 nm = 0.0045 to (x)290 nm = 0.053. The obtained results may contribute to the production of effective polysilane nanomasks and to information recording.

Antimicrobial polyhydroxybutyrate submicron fiber mat loaded with extract of Hypericum perforatum

Milos Beran,Ales Horna,Viktor Vorisek,Eliska Berkova,Radka Korinkova,Vojtech Trousil,Marketa Hrubanova 한국식물생명공학회 2022 JOURNAL OF PLANT BIOTECHNOLOGY Vol.49 No.3

The aim of this work was to prepare a new biodegradable polyhydroxybutyrate (PHB) submicron fiber mat loaded with hypericin-rich Hypericum perforatum raw extract by centrifugal spinning technology, an alternative approach to the traditional method of electrospinning to fabricate nanofibers or microfibers from solutions at high speed and low cost. Hypericins in methanol/acetone extract of H. perforatum were determined by UHPLC-MS/MS and HPLC/PDA. Submicron fiber mats composed of pure PHB or PHB enriched with H. perforatum extract were prepared using a pilot plant demonstrator for the centrifugal spinning technology and characterized by SEM. Singlet oxygen production was quantified by the 1,3-diphenylisobenzofuran (DPIBF) method in hexane. The results proved a significant production of singlet oxygen by the prepared submicron fiber mat. We also found a significant antibacterial activity against the bacterial strain Escherichia coli CCM 5417 by a method in accordance with JIS Z 2801/ISO 22196 standards. The H. perforatum extract-enriched PHB submicron fiber mats showed potential for the development of self-cleaning and antimicrobial air filters.

The efficiency of different types of extenders for semen cooling in stallions

Reckova, Zuzana,Filipcík, Radek,Souskova, Katarína,Kopec, Tomas,Hosek, Martin,Pesan, Vojtech Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.5

Objective: This study was conducted to examine influence of skimmed milk-based extender (SM), INRA 96 extender and BotuSemen Gold extender on parameters of stallions' ejaculate during storage. Methods: In this study, 14 stallions between 4 and 20 years of age were monitored. Total and progressive motility, viability and morphology of sperm were evaluated at time intervals of 24, 48, and 72 hours after collection. Results: The total motility, progressive motility, and values of sperm with normal morphology were significantly higher in the INRA 96 and BotuSemen Gold extenders than in the SM (p<0.01). The sperm viability differed significantly in all extenders (p<0.01). The highest value of sperm viability was in INRA 96 (64.69%±0.67%) and lowest in SM (59.70%±0.81%). The highest differences occurred at 72 hours of storage. Values of total motility, progressive motility and sperm viability decreased over time (p<0.01). In case of sperm morphology there was no statistically significant decrease between 48- and 72-hour time intervals. Conclusion: It can be concluded that the extenders with a chemically defined composition have shown better indicators of insemination capabilities in ejaculates than the SM. The BotuSemen Gold extender is a suitable alternative to the INRA 96, when used within 48 hours; after 72 hours of storage, however, the INRA 96 showed a higher share of viable spermatozoa.

Characterizing treatment pathways at scale using the OHDSI network

Hripcsak, George,Ryan, Patrick B.,Duke, Jon D.,Shah, Nigam H.,Park, Rae Woong,Huser, Vojtech,Suchard, Marc A.,Schuemie, Martijn J.,DeFalco, Frank J.,Perotte, Adler,Banda, Juan M.,Reich, Christian G.,S National Academy of Sciences 2016 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.113 No.27

<P>Observational research promises to complement experimental research by providing large, diverse populations that would be infeasible for an experiment. Observational research can test its own clinical hypotheses, and observational studies also can contribute to the design of experiments and inform the generalizability of experimental research. Understanding the diversity of populations and the variance in care is one component. In this study, the Observational Health Data Sciences and Informatics (OHDSI) collaboration created an international data network with 11 data sources from four countries, including electronic health records and administrative claims data on 250 million patients. All data were mapped to common data standards, patient privacy was maintained by using a distributed model, and results were aggregated centrally. Treatment pathways were elucidated for type 2 diabetes mellitus, hypertension, and depression. The pathways revealed that the world is moving toward more consistent therapy over time across diseases and across locations, but significant heterogeneity remains among sources, pointing to challenges in generalizing clinical trial results. Diabetes favored a single first-line medication, metformin, to a much greater extent than hypertension or depression. About 10% of diabetes and depression patients and almost 25% of hypertension patients followed a treatment pathway that was unique within the cohort. Aside from factors such as sample size and underlying population (academic medical center versus general population), electronic health records data and administrative claims data revealed similar results. Large-scale international observational research is feasible.</P>

Tularemia Progression Accompanied with Oxidative Stress and Antioxidant Alteration in Spleen and Liver of BALB/c Mice

Miroslav Pohanka,Oto Pavlis,Branislav Ruttkay-Nedecky,Jiri Sochor,Jakub Sobotka,Jiri Pikula,Vojtech Adam,Rene Kizek 한국미생물학회 2012 The journal of microbiology Vol.50 No.3

Francisella tularensis is the causative agent of tularemia. It is an intracellular pathogen with the ability to survive within phagosomes and induce pyroptotic cell death. In this study, we attempted to prove whether oxidative imbalance plays a significant role in tularemia pathogenesis. In our experimental model, we subcutaneously infected female BALB/c mice (dose 105 CFU of F. tularensis LVS). Liver, spleen, and blood were collected from mice at regular intervals from days 1–15 after infection. The bacterial burden was assessed by a cultivation test. The burden was unchanging from the 2nd to 6th day after infection. The bacterial burden corresponded to the plasmatic level of IFN-γ, IL-6, and liver malondialdehyde. After the phase of acute bacteraemia and the innate immunity reaction, the levels of reduced glutathione and total low molecular weight antioxidants decreased significantly and the activity of caspase-3 increased in the liver. The level of reduced glutathione decreased to 25% of the original level, and the total level of low molecular weight antioxidants was less than 50% of the initial amount. The demonstrated effects of tularemia-induced pathology had a more extensive impact on the liver than on the spleen.