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Found 6289 publications

Survey of free speeds on rural roads based on road scene photographs

Gabriella Kosztolanyi-Ivan

Publication Name: Pollack Periodica

Publication Date: 2012-04-01

Volume: 7

Issue: 1

Page Range: 65-74

Description:

In Hungary since 2008 some roads operate with posted speed limits, which are higher than the general 90 kmph outside urban areas. The goal of the current study was to explore how well road users can recognize various types of roads. The results show on one hand that on the usual road categories like motorways and normal two-lane primary roads the speed choice is clear for road users, i.e. these roads are self-explaining. On the other hand, there are also road categories, which are not self-explaining and therefore road users have difficulties to choose the appropriate speeds.

Open Access: Yes

DOI: 10.1556/Pollack.7.2012.1.6

Applications of Macro- and Microfiller-Reinforced Polymer Composites

H. Hargitai Ilona Rácz

Publication Name: Polymer Composites

Publication Date: 2012-03-21

Volume: 1

Issue: Unknown

Page Range: 747-790

Description:

No description provided

Open Access: Yes

DOI: 10.1002/9783527645213.ch23

Bacterial memetic algorithm for offline path planning of mobile robots

János Botzheim Yuichiro Toda Naoyuki Kubota

Publication Name: Memetic Computing

Publication Date: 2012-03-01

Volume: 4

Issue: 1

Page Range: 73-86

Description:

The goal of the path planning problem is to determine an optimal collision-free path between a start and a target point for a mobile robot in an environment surrounded by obstacles. This problem belongs to the group of combinatorial optimization problems which are approached by modern optimization techniques such as evolutionary algorithms. In this paper the bacterial memetic algorithm is proposed for path planning of a mobile robot. The objective is to minimize the path length and the number of turns without colliding with an obstacle. The representation used in the paper fits well to the algorithm. Memetic algorithms combine evolutionary algorithms with local search heuristics in order to speed up the evolutionary process. The bacterial memetic algorithm applies the bacterial operators instead of the genetic algorithm's crossover and mutation operator. One advantage of these operators is that they easily can handle individuals with different length. The method is able to generate a collision-free path for the robot even in complicated search spaces. The proposed algorithm is tested in real environment. © 2012 Springer-Verlag.

Open Access: Yes

DOI: 10.1007/s12293-012-0076-0

The Hungarian EU Presidency-A newcomer's experience in a novel institutional framework

Balázs Horváthy Réka Friedery

Publication Name: Acta Juridica Hungarica

Publication Date: 2012-03-01

Volume: 53

Issue: 1

Page Range: 103-114

Description:

No description provided

Open Access: Yes

DOI: 10.1556/AJur.53.2012.1.10

Implicit a posteriori error estimation using patch recovery techniques

Tamás L. Horváth Ferenc Izsák

Publication Name: Central European Journal of Mathematics

Publication Date: 2012-02-01

Volume: 10

Issue: 1

Page Range: 55-72

Description:

We develop implicit a posteriori error estimators for elliptic boundary value problems. Local problems are formulated for the error and the corresponding Neumann type boundary conditions are approximated using a new family of gradient averaging procedures. Convergence properties of the implicit error estimator are discussed independently of residual type error estimators, and this gives a freedom in the choice of boundary conditions. General assumptions are elaborated for the gradient averaging which define a family of implicit a posteriori error estimators. We will demonstrate the performance and the favor of the method through numerical experiments. © 2012 Versita Warsaw and Springer-Verlag Wien.

Open Access: Yes

DOI: 10.2478/s11533-011-0119-7

Plausible quantum-mechanical interpretations of RHEED oscillation

Ákos Nemcsics Szilvia Nagy

Publication Name: Vacuum

Publication Date: 2012-01-27

Volume: 86

Issue: 6

Page Range: 620-622

Description:

In this paper the oscillations of reflection high-energy electron diffraction is investigated on the basis of the electron complementarity principle and quantum entanglement. The intensity oscillations during the growth process can be explained by the change of the surface morphology, which is caused by the changing of the experimental conditions. The experimental conditions affect both the description of the interaction on the surface and the behavior of the electrons as quantum mechanical entities, i.e., if their particle-like or wave-like properties dominate. The interpretation of these phenomena can be made plausible with the help of the idea of quantum entanglement. © 2011 Elsevier Ltd. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.vacuum.2011.07.020

Long-term safety trends as a function of vehicle ownership in 26 Countries

Csaba Koren A. Borsos Nalini Ravishanker John N. Ivan

Publication Name: Transportation Research Record

Publication Date: 2012-01-12

Volume: Unknown

Issue: 2280

Page Range: 154-161

Description:

The objective of this paper was to model the evolution of road safety as a function of motorization level. The authors completed a country-level as well as a time-dependent analysis focusing on countries for which data were available for a long period of time (1965 to 2009). For the statistical analysis, a function describing road safety trends (decline, turning, improvement) was proposed. Two coefficients in the model were estimated for each country and for each year, and their change over time is discussed. The results showed that the shape of the curve changed over time. In some countries, the decrease in the mortality rate became slower over time; however, a greater potential to improve road safety existed in other countries. Possible reasons for the general positive trends in road safety are the continuous improvement in engineering solutions (better infrastructure, safer cars) as well as road users who are better trained and skilled because of education and experience. In addition to the factors mentioned previously, the increased speed by which safety-related information and knowledge are disseminated contributes to the decrease in the differences in safety levels among countries.

Open Access: Yes

DOI: 10.3141/2280-17

Development of production logistics system based on lean principles

Tamás Hartványi Csaba I. Hencz

Publication Name: International Conference on Industrial Logistics Icil 2012 Conference Proceedings

Publication Date: 2012-01-01

Volume: Unknown

Issue: Unknown

Page Range: 349-355

Description:

This paper acquaints the production logistics system about a Hungarian operating vehicle part manufacturing company, including its examination, and development opportunities. This paper's highlighted objectives are the preparation and analysis of the basic data of development recommendation. Moreover, it demonstrates lean based outsourcing strategies which could significantly reduce the company's handling demands.

Open Access: Yes

DOI: DOI not available

Application of design tools in carbody construction harmonizing shape and dynamical load

Timea Fülep Péter Harth

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics Identification and Anomalies

Publication Date: 2012-01-01

Volume: 2012-November

Issue: Unknown

Page Range: 379-386

Description:

There are two main areas highlighted in the paper concerning car body manufacturing: construction and design work or in other words functionality and aesthetics. The question is to be answered: Which is more important? The solution is untying this quasi contradiction, but it is not an easy task. The ergonomical and aesthetical demands are not unambiguous; they depend also on weather conditions, different anthropometrics, changeable conditions during operation, attitudes, traditions, mentalities, local and actual trends etc. Nowadays the external and internal design does not belong to the main constructor or automotive engineer. The major original equipment manufacturers (OEM) charge special designers to do such work similarly to the separated engine, axles, brake system, electric network design. Nevertheless there are many details that must fit together in the vehicle. As long as the different engineering interests can be harmonized in a rational way, in aesthetical and design questions tastes can be decisive beside rationality. This makes the decisions difficult. The GIST of the cooperation is that future automotive engineers must know the designer's way of thinking at least the main stream in order to consider and make good decisions.

Open Access: Yes

DOI: DOI not available