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Kornel Warwas,Krzysztof Augustynek,Vasyl Martsenyuk,Oleksandr Korchenko,Volodymyr Karpinskyi 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In many cases, solving optimisation problems, in particular a dynamic optimisation problem, is time-consuming. This is due to the long time of calculation of the objective function value. For example, during optimisation of the articulated vehicle it is necessary to integrate dynamic equations of motion in the whole time interval. The paper presents an application of own algorithm (EVCA) for reduction optimisation calculations time. This algorithm can be applied to any optimisation methods both stochastic and classical in order to speed up the optimization process. In this paper, articulated vehicle control task has been formulated as dynamic optimisation problem. During this process appropriate braking torques acting on wheels have been determined in order to restore stability of the vehicle. Results obtained from dynamic optimisation using EVCA algorithm have been presented and discussed.
3축 마이크로 공작기계용 자기예압 공기베어링 스테이지의 정, 동적 특성
노승국,Kornel F. Ehmann,Yoon, Hyung-Suk,박종권 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
In this paper, the static and dynamic stiffness of the air bearing stage for micro-micro machine tool are examined experimentally. For stiffness and precision concerns, air bearing stages are adapted for 3-axis micro-milling machine which is size of 200x200 mm². The air bearings in the stage are preloaded by permanent magnets to achieve desired bearing clearance and stiffness for vertical direction. As the stiffness of the air bearing is primary interests, static stiffness test were performed on XY stage in Z direction and Z column in Y direction. Dynamic test were performed on XY stage and Z column, respectively. Both static and dynamic tests were performed in different air pressure conditions. The vertical stiffness of XY stage is about 9N/μm where Y stiffness of Z column is much smaller as 1N/μm because of the large moment generated by Y force on the column.
Variability of laying hen behaviour depending on the breed
Agnieszka Kozak,Kornel Kasperek,Grzegorz Zieba,Iwona Rozempolska-Rucinska 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.7
Objective: For many generations, most species of farm animals have been subjected to intense and strictly targeted selection for improvement of their performance traits. This has led to substantial changes in animal anatomy and physiology, which resulted in considerable differences between the current animal breeds and their wild ancestors. The aim of the study was to determine whether there is breed-specific variability in behaviour as well as differences in emotional reactivity and preferences of laying hens. Methods: The investigations involved 50 Green-legged Partridge, 50 Polbar, and 50 Leghorn hens. All birds were kept in the same conditions, and the behavioural tests were carried out at 30 weeks of age. We used the tonic immobility test and a modified open-field test including such objects as water, commercial feed, feed enriched with cereal grains, finely cut straw, and insect larvae, a sandpit, a mirror, and a shelter imitating a hen nest. Results: The research results demonstrate that the birds of the analysed breeds differ not only in the excitability and emotional reactivity but, importantly, also in the preferences for environment-enriching elements. Ensuring hens’ well-being should therefore be based on environmental modifications that will facilitate acquisition of essential elements of chickens’ behaviour. The greatest emotional reactivity was found in the Leghorn breed, which may be a result of correlated selection aimed at an increase in chicken productivity. Conclusion: The differences in the behaviour of the birds from the analysed breeds indicate that laying hens cannot be regarded as one group of animals with the same environmental requirements.
On Multivariate Method of Qualitative Analysis of Hodgkin-Huxley Model with Decision Tree Induction
Vasyl Martsenyuk,Kornel Warwas,Krzysztof Augustynek,Aleksandra Kłos-Witkowska,Volodymyr Karpinskyi,Natalya Klymuk,Zoryana Mayhruk 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
This paper presents a data mining technique for qualitative analysis of Hodgkin-Huxley model of cell excitability. Such problem cannot be solved analytically. Therefore we apply Monte-Carlo techniques for the generation of model parameters, and use data mining algorithm for classification of learning tuples obtained. As a result we attain a decision tree capable of classifying the excitability depending on the relationship between initial conditions and between rate constants. Details of software development and issues of computational complexity are presented. The software includes the package of Java-classes. An example for classification of excitability of three types is presented
Yi, Joo-Mi,Schuebel, Kornel,Kim, Heui-Soo Academic Press 2007 Genomics Vol.89 No.1
<P><B>Abstract</B></P><P>Human endogenous retroviral sequences family P (HERV-P) proviral sequences have been located within the human genome. Here, we identify and analyze novel putative structural genes of HERV-P in primates, human tissues, and cancer cells with an aim toward better understanding their evolutionary relationships and transcriptional potential. The expression pattern of HERV-P structural genes indicates that they are actively amplified in human tissues and widely expressed in cancer cells, suggesting a potential role in carcinogenesis. Phylogenetic analyses suggest that the HERV-P family may be divided into two distinct categories that arose during primate evolution via active gene duplication. Taken together, our data provide a better understanding of the dynamic evolutionary features and potential functional roles of the HERV-P gene family.</P>
A Three-axis Translation Stage Using Opposing Wedges with Error Compensation
김경호,노승국,박종권,Kornel Ehmann 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
We describe the development of a three-axis translation stage using wedges and its motion error compensation. The threeaxis stage uses three wedges and is capable of translation in the vertical and longitudinal directions by controlling the horizontal separation of two opposing wedges. An independent linear translation stage is used to achieve displacement along the third axis. Compensation for straightness and positioning errors is achieved using the combined motion of the two opposing wedges and the motion of an independent linear stage. The straightness error in the vertical and horizontal directions through the longitudinal axis was 0.83 μm and 1.65 μm, respectively, before compensation and 0.22 μm and 0.29 μm with error compensation. The positioning error through the longitudinal axis was reduced from 8.96 μm to 0.85 μm.
Feasibility of Using Copper(II)Oxide for Additive Manufacturing
Yunho Yang,Christopher Yarka,Jian Cao,Kornel Ehmann 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Additive manufacturing, in spite of its ever wider application range, is still plagued by issues ranging from accuracy to surface finish. In this study, to address the latter issue, the feasibility of using Copper(II)Oxide powder with a polymer binder deposited through aFused Deposition Modeling (FDM) 3D printing technique is explored. In particular, the post processing of the green componentsthrough a newly developed furnace sintering process is investigated. The properties of the generated test samples were assessed byusing Scanning Electron Microscope (SEM), surface roughness and optical analysis methods in addition to properties of the sinteredsamples through Energy Dispersive X-Ray Spectrometry (EDS).
Four Principles of Memory Improvement: A Guide to Improving Learning Efficiency
Bennett L. Schwartz,Lisa K. Son,Nate Kornell,Bridgied Finn 대한사고개발학회 2011 The International Journal of Creativity & Problem Vol.21 No.1
Recent advances in memory research suggest methods that can be applied to enhance educational practices. We outline four principles of memory improvement that have emerged from research: 1) process material actively, 2) practice retrieval, 3) use distributed practice, and 4) use metamemory. Our discussion of each principle describes current experimental research underlying the principle and explains how people can take advantage of the principle to improve their learning. The techniques that we suggest are designed to increase efficiency—that is, to allow a person to learn more, in the same unit of study time, than someone using less efficient memory strategies. A common thread uniting all four principles is that people learn best when they are active participants in their own learning.