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Farkas Andrea,Degiuli Nastia,Martić Ivana 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
Biofouling represents an important problem in the shipping industry since it causes the increase in surface roughness. The most of ships in the current world fleet do not have good coating condition which represents an important problem due to strict rules regarding ship energy efficiency. Therefore, the importance of the control and management of the hull and propeller fouling is highlighted by the International Maritime Organization and the maintenance schedule optimization became valuable energy saving measure. For adequate implementation of this measure, the accurate prediction of the effects of biofouling on the hydrodynamic characteristics is required. Although computational fluid dynamics approach, based on the modified wall function approach, has imposed itself as one of the most promising tools for this prediction, it requires significant computational time. However, during the maintenance schedule optimization, it is important to rapidly predict the effect of biofouling on the ship hydrodynamic performance. In this paper, the effect of biofilm on the ship hydrodynamic performance is studied using the proposed performance prediction method for three merchant ships. The applicability of this method in the assessment of the effect of biofilm on the ship hydrodynamic performance is demonstrated by comparison of the obtained results using the proposed performance prediction method and computational fluid dynamics approach. The comparison has shown that the highest relative deviation is lower than 4.2% for all propulsion characteristics, lower than 1.5% for propeller rotation rate and lower than 5.2% for delivered power. Thus, a practical tool for the estimation of the effect of biofouling with lower fouling severity on the ship hydrodynamic performance is developed.
Giftedness in the Area of (First) Language – Why develop it?
Katarina Farkas 고려대학교 응용문화연구소 2017 에피스테메 Vol.0 No.17
Giftedness in the area of first language has not yet been scientifically researched more in detail. This specific giftedness can be observed in the linguistic and literal competences of students. As these competences are very important for many different professions, it is important to not only analyze them but to also develop them. The Language Drawer is a model that points out how these competences can be developed and what teachers or coaches need to help gifted students improve their competences. An important aspect of giftedness is creativity. As creativity proves helpful inproblemsolving in various contexts, especially in engineering science, but also in many other areas such as natural science, politics or economics, it is important for any gifted student to develop creative skills. Creativity can be observed in first language products, but it can also be developed by producing new language products. The language drawer offers various activties to develop student creativity.
Indispensability of Computational Modeling in Cognitive Science
( Igor Farkas ) 서울대학교 인지과학연구소 2012 Journal of Cognitive Science Vol.13 No.4
The concept of computation remains a frequently discussed topic in cognitive science, but there is no consensus about its meaning and the role in this field. I discuss this concept in wider sense, also including nonclassical computation, in the light of Marr`s three levels of analysis and their relevance for main modeling frameworks pursued in cognitive science-symbolic, connectionist, dynamic and probabilistic. I point to differences between these approaches and argue, providing empirical and theoretical arguments, that connectionism, out of the existing approaches, holds the promise of providing the most plausible and detailed accounts of human cognition. Connectionism also benefits from the emerging field of cognitive developmental robotics that aims at designing autonomous cognitive robots using the synthetic bottom-up approach. I conclude with emphasizing the key role of computational modeling that will help advance the field of computational cognitive science as an indispensable core component.
In Situ Investigation of Deformation Mechanisms in Magnesium-Based Metal Matrix Composites
Gergely Farkas,최희만,Kristián Máthis,Zoltán Száraz,노윤숙,Zuzanka Trojanová,Peter Minárik 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
We studied the effect of short fibers on the mechanical properties of a magnesium alloy. In particular, deformation mechanisms in a Mg-Al-Sr alloy reinforced with short alumina fibers were studied in situ using neutron diffraction and acoustic emission methods. The fibers’ plane orientation with respect to the loading axis was found to be a key parameter, which influences the acting deformation processes, such as twinning or dislocation slip. Furthermore, the twinning activity was much more significant in samples with parallel fiber plane orientation, which was confirmed by both acoustic emission and electron backscattering diffraction results. Neutron diffraction was also used to assist in analyzing the acoustic emission and electron backscattering diffraction results. The simultaneous application of the two in situ methods, neutron diffraction and acoustic emission, was found to be beneficial for obtaining complementary datasets about the twinning and dislocation slip in the magnesium alloys and composites used in this study.
Integration of UML with Simulink into Embedded Software Engineering
Tibor Farkas,Emi Meiseki,Carsten Neumann,Kunihisa Okano,Andreas Hinnerichs,Shingo Kamiya 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Today, control algorithms of electronic in-vehicle functions are implemented on various networked control units with different software architectures and designs. Special effort is needed when integrating those artifacts and software components from different sources to overcome the limits of efficient integration of model-based design into the embedded development. This paper focuses on the advantages of model-based development by mixing object-oriented and signal-oriented modeling concepts together and referencing (generated) legacy software components to get an overall software design. Therefore, we present an integration methodology of UML and Simulink modeling concepts to a traditional automotive software engineering process. Furthermore we describe the model-based engineering of a car-door control system as an example.
Bujna, Erika,Farkas, Nikoletta Annamaria,Tran, Anh Mai,Dam, Mai Sao,Nguyen, Quang Duc 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.2
Apricot is a popular fruit in the world with rich in carbohydrates, vitamins and elements as well as has high antioxidant capacity. In this study, fermentation of this juice by mono- and mixed cultures was investigated. All tested strains exhibited good growth properties on apricot juice without any nutrient supplementation. In monoculture fermentation, 7.2, 7.25, 7.06 and 7.16 log (cfu/mL h) cell yields were observed for Bifidobacterium lactis Bb-12, Bifidobacterium longum Bb-46, Lactobacillus casei 01 and Lactobacillus acidophilus La-5 strains, respectively, and higher cell yields were obtained in the mixed culture fermentation. The antioxidant capacity increased slightly during fermentation. The concentration of acetic acid (27-48 mM) were about doubled in cases of the mixed culture fermentations than of monoculture fermentations (18-30 mM), while the levels of lactic acid were similar (70-90 mM). The relatively high values of these properties offer the potential for development of novel probiotic apricot juice.