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Found 6289 publications

Teaching popular culture 3D/VR technology

Adel Vehrer

Publication Name: 8th IEEE International Conference on Cognitive Infocommunications Coginfocom 2017 Proceedings

Publication Date: 2017-07-02

Volume: 2018-January

Issue: Unknown

Page Range: Unknown

Description:

Teaching Popular culture 3D/VR Technological background may offer novel experience to learners regarding visual impact and content, which makes both imparting and learning new materials more efficient. 3D/VR technology makes possible for the students to getting closer visually to the world of the elder people in time and space. All these contribute to the subject will become more practice-oriented.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2017.8268297

Control Analysis and Synthesis through Polytopic Tensor Product Model: a General Concept

Peter Galambos Jozsef Kuti Péter Baranyi

Publication Name: IFAC Papersonline

Publication Date: 2017-07-01

Volume: 50

Issue: 1

Page Range: 6558-6563

Description:

The paper revisits and renew the concept of Polytopic Tensor Product (TP) Model based control analysis and synthesis by generalizing the use of TP-structured variables in the definite conditions derived from the applied control criteria. For TP forms that can depend on multivariate parameter sets (optionally with two times or larger multiplicities), a compact TP formalism is proposed where the multiplicity vector describes the structure. By setting the multiplicities, the parameter dependencies can be neglected or considered with arbitrary high complexity in the variables of controller-candidate, Lyapunov-function candidate and slack variables as well. The paper points out that the definite conditions on the structures of these variables results in definite conditions on Polytopic TP forms enabling a recursive method to reformulate them into Linear Matrix Inequalities (LMIs), Bilinear Matrix Inequalities (BMIs), etc. according to the design method in consideration. The application of the novel concept is shown through H∞ state feedback design for Linear Parameter Varying (LPV) systems.

Open Access: Yes

DOI: 10.1016/j.ifacol.2017.08.611

Design and control for torque ripple reduction of a 3-phase switched reluctance motor

Miklós Kuczmann Daniel Marcsa

Publication Name: Computers and Mathematics with Applications

Publication Date: 2017-07-01

Volume: 74

Issue: 1

Page Range: 89-95

Description:

A major problem in switched reluctance motor is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in 6/4-pole three-phase switched reluctance motor by geometry modification and using control technique. The proposed method combined the specially skewed rotor pole shape with instantaneous torque control with sinusoidal torque sharing function. The results of geometry modification are analysed through the three-dimensional finite element simulation to determine the appropriate skewing angle. The drive performances of conventional and modified motor are compared through the simulations. The effectiveness of the proposed method is also demonstrated and verified by the simulations.

Open Access: Yes

DOI: 10.1016/j.camwa.2017.01.001

Generalization of Tensor Product Model Transformation for Control Design

Peter Galambos Jozsef Kuti Péter Baranyi

Publication Name: IFAC Papersonline

Publication Date: 2017-07-01

Volume: 50

Issue: 1

Page Range: 5604-5609

Description:

The paper shows that the separated structure of parameter dependencies within the Polytopic Tensor-Product (TP) model can be exploited during the controller design by applying controller candidates that depend only on certain parameter sets. This approach combines the polytopic uncertainty and Parallel Distributed Compensation (PDC) concepts in such a way that they become special cases of the proposed formulation. Motivated by this recognition and the fact that the separation of parameter dependencies increases the complexity and computational cost, the definition of Polytopic TP representation for LPV/qLPV models is relaxed. The new definition allows for the use of arbitrarily chosen parameter sets in the model - according to the control goals - and the separation can be performed only for these sets. Through the derivation, an appropriate transformation algorithm and the unique Affine TP model is introduced discussing the related concepts of tensor algebra and affine geometry as well.

Open Access: Yes

DOI: 10.1016/j.ifacol.2017.08.1106

The historical role of milk and dairying in shaping European societies

László Varga

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2017-06-30

Volume: 63

Issue: 2

Page Range: 1537-1547

Description:

Based on results recently published in the scientific literature, the author briefly outlines in this mini-review how dairying has become, over thousands of years, a basic activity of humankind. Following the domestication of cattle, goats and sheep, which had begun approximately 10,500 to 11,000 years ago in the Middle East, milk was already in use in northwestern Anatolia by the seventh millennium BC. In lack of lactase, however, milk consumption resulted in unpleasant outcomes (e.g., flatulence, cramps, diarrhea, etc.) in the vast majority of prehistoric farmers. The negative symptoms associated with lactose intolerance were later considerably alleviated by the introduction of simple milk processing techniques such as fermentation. Thus, for instance, Neolithic farming communities in north-central Poland started producing cheese between 6800 and 7400 years ago. Intriguingly, the ability to digest lactose in adulthood, termed lactase persistence (LP), emerged as a result of a genetic mutation at about the same time in central Europe, and the LP allele has been subject to strong positive selection afterwards. As the so-called gene–culture coevolutionary model suggests, the cultural evolution of dairy farming tightly entwined with the biological evolution of LP over millennia, and these processes are likely to have profoundly influenced the genetic composition of European populations.

Open Access: Yes

DOI: DOI not available

Rutin in buckwheat grain meal determined by UV photoacoustic spectroscopy and HPLC

György Végvári Andrea Brunori Ottó Dóka Dane Bicanic Rezso Schmidt

Publication Name: Nova Biotechnologica Et Chimica

Publication Date: 2017-06-27

Volume: 16

Issue: 1

Page Range: 61-67

Description:

A relatively novel approach for easy and quick determination of rutin in buckwheat grain is suggested. The rutin content of the grain in seven common buckwheat (Fagopyrum esculentum) and six Tartary buckwheat (Fagopyrum tataricum) varieties was investigated by means of UV photoacoustic spectroscopy and HPLC as reference method. The lowest content was found in 'Botan' and 'Bamby' varieties, while the highest values were obtained in the variety 'Emka'. Rutin content in grain of all Tartary buckwheat varieties was two orders of magnitude higher than in the other varieties. Rutin content in F. esculentum ranges between 9 and 36 mg/100 g dry weight as compared to 921 to 2 132 mg/100 g dry weight in F. tataricum. The UV photoacoustic spectroscopy data show rather good correlations of R2=0.977 and R2=0.980 with values obtained by HPLC data for all measured samples. Therefore, UV photoacoustic spectroscopy can be a cheap and quick method for determining rutin content in buckwheat grain.

Open Access: Yes

DOI: 10.1515/nbec-2017-0009

Features of segment winded PMSM for a low voltage supply system

I. Szenasy Z. Varga

Publication Name: 2017 3rd International Conference on Control Automation and Robotics Iccar 2017

Publication Date: 2017-06-07

Volume: Unknown

Issue: Unknown

Page Range: 523-528

Description:

This paper presents a symmetric winded PMSM which is connected by all in part coil to a supply system at low voltage of 48-100 V DC, developed by Research Center of Vehicle Industry in Szechenyi University. It has several benefits of this winding system its separate supply. The motor construction is slightly different from the general constructions; its running and control are different but on the whole offers new availabilities and prosperous solutions as well as electrical motor features. The paper presents some results of investigations mainly in the control for this divided kind of PMSM which was patented in 2014.

Open Access: Yes

DOI: 10.1109/ICCAR.2017.7942752

Comparative study on credibility measures of type-2 and type-1 fuzzy variables and their application to a multi-objective profit transportation problem via goal programming

Dipak Kumar Jana Palash Sahoo L. T. Kóczy

Publication Name: International Journal of Transportation Science and Technology

Publication Date: 2017-06-01

Volume: 6

Issue: 2

Page Range: 110-126

Description:

In real world applications supply, demand and transportation costs per unit of the quantities in multi-objective transportation problems may be hardly specified accurately because of the changing economic and environmental conditions. It is also significant that the time required for transportation should be minimized. In this paper, we have presented three reduction methods for a type-2 triangular fuzzy variable (T2TrFV) by adopting the critical value (CV). Three generalized expected values (optimistic, CV and pessimistic) are derived for T2TrFVs with some special cases. Then a multi-objective profit transportation problem (MOPTP) with fixed charge (FC) cost has been formulated and solved in type-2 fuzzy environment. Unit transportation costs, FC, selling prices, unit transport times, loading and unloading times, total supply capacities and demands are all considered as triangular Type-2 fuzzy numbers. The MOPTP has been converted into a single objective by using the goal programming technique and the weighted sum method. The deterministic model is then solved using the Generalized Reduced Gradient method Lingo 14.0. Numerical experiments with some sensitivity analysis are illustrated the application and effectiveness of the proposed approaches.

Open Access: Yes

DOI: 10.1016/j.ijtst.2017.06.002

Overall imperfection method for flexure and compression steel beam-columns

Achim Rubert G. Hajdú Ferenc Papp

Publication Name: Stahlbau

Publication Date: 2017-06-01

Volume: 86

Issue: 6

Page Range: 483-496

Description:

Overall imperfection method for flexure and compression steel beam-columns. The principles and applications of the overall (global) imperfection method (OIM) for beam-columns are presented in this paper. The buckling resistance of a beam-column member is determined by the resistance of its critical cross-section taking into account second-order effect of the eigenform equivalent initial imperfection. The maximum amplitude of this initial imperfection, in the shape of elastic buckling mode, is determined from fundamental cases, which are simply fork supported members with uniform cross-section under uniformly distributed normal force or bending moment. The standardized buckling resistance of the fundamental cases is based on theoretical and empirical background. The proposed global imperfection method is adequate for computer-aided design method using advanced elastic beam-column finite element method including the warping behavior of the cross section. The accuracy of the presented method is illustrated step-by-step with numerical examples.

Open Access: Yes

DOI: 10.1002/stab.201710471