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Found 6278 publications

Representations of HRTFs using MATLAB: 2D and 3D plots of accurate dummy-head measurements

György Wersényi

Publication Name: 20th International Congress on Acoustics 2010 Ica 2010 Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society

Publication Date: 2010-12-01

Volume: 2

Issue: Unknown

Page Range: 1058-1066

Description:

Human Head-Related Transfer Functions describe the transmission from the free-field to the eardrums. HRTFs are measured on human subjects or on dummy-heads, characterized by the angle of incidence. The dummy-head measurement method allows the acquisition of data in high spatial resolution. Our setup provided HRTF data in 1 degree horizontal and 5 degrees elevational steps in different environmental settings. Spectral evaluation in spatial hearing research requires proper representation methods of detailed measurement data. Different 2D and 3D representation methods will be presented here, using different coordinate systems, color maps and additional filtering methods programmed under MATLAB. Figures are mainly helpful for HRTF analysis but MATLAB features allow other use for applications where directional characteristics, polar plots are required. Copyright© (2010) by the International Congress on Acoustics.

Open Access: Yes

DOI: DOI not available

Experimental and numerical investigation of internally reinforced damaged pipelines

Balázs Pere J. Lukács Gy Nagy János Égert I. Török

Publication Name: 18th European Conference on Fracture Fracture of Materials and Structures from Micro to Macro Scale

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The purpose of the paper is to present the role of the internal reinforcing on the structural integrity of steel pipes, based on numerical and experimental investigations. For FE analysis of unreinforced case three mechanical models were applied: multilayered elastic shell, 3D elastic solid and 3D elastic-plastic solid FE models. The aim of the numerical analysis was to clarify deformations, stresses and strains in the surrounding area of defects both in the steel pipe and on the composite reinforcement. A further task is to determine numerically the width of reinforcement and the number of layers needed for the repair. For experimental investiga-Tions internal reinforcement was developed using glass fibre polymer matrix composite. Fa-Tigue and burst tests were performed on pipe sections containing artificial metal loss defects. Both unreinforced and reinforced pipeline sections were examined. The applicability of the hybrid structure was demonstrated by means of the numerical and the experimental results.

Open Access: Yes

DOI: DOI not available

Hungary

Klara Kerezsi Katalin Parti Csaba Gyory Orsolya Bolyky Eszter Sarik

Publication Name: Juvenile Delinquency in Europe and Beyond Results of the Second International Self Report Delinquency Study

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 311-325

Description:

Hungary is situated in Eastern Europe, in the rolling plains of the Carpathian Basin. It covers an area of 93,000 km2, which is roughly equivalent to 1% of Europe's territory. There are 3,145 settlements, 289 of which are urban; their number increased by 123 in the last 15 years, and tripled over the past 25 years. Two-thirds of the country's inhabitants live in urban settlements. Hungary has been an EU member state since 2004. The population of Hungary was 10,077,000 on 1 January 2006 (male: 4.7 million; female: 5.3 million) (HCSO, p. 9). Hungary's population is aging; the total number of people in age cohorts above 60 exceeds the total number of 1-year old to14-year-olds by about half a million. On 1 April 2005, at the time of the micro census, the number of households was more than 4 million, 139 thousand higher compared to that in 2001. The total number of marriages is decreasing, consistently below the number registered in 2000. Slight increases may occur: in 2005, 44,100 couples got married, 0.7% more than the year before. Decrease remains the dominant trend, though. There was no significant change in the divorce rate: 24,700 marriages were dissolved in 2005, about the same as the year before. Since people get married later in life, divorces happen at a later age, too (HCSO, p. 9) © 2010 Springer-Verlag New York.

Open Access: Yes

DOI: 10.1007/978-0-387-95982-5_22

Performance of CFD codes on CPU/GPU clusters

Manfred Liebmann Zoltán Horváth

Publication Name: Aip Conference Proceedings

Publication Date: 2010-12-01

Volume: 1281

Issue: Unknown

Page Range: 1789-1792

Description:

The paper investigates the scalability of a parallel Euler solver, using the Vijayasundaram method, on CPU and GPU clusters. The aim of this research is to develop efficient parallel CFD codes on unstructured meshes. We present the relevant algorithms and some benchmark results, which show overall efficiency of the solver. © 2010 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.3498230

Series active filters - Spice simulation

Z. Puklus Balázs Tóth

Publication Name: 11th IEEE International Symposium on Computational Intelligence and Informatics Cinti 2010 Proceedings

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 229-231

Description:

Active filters are known as the best tools for harmonic mitigation as well as reactive power compensation, load balancing, voltage regulation, and voltage flicker regulation on the power lines. To introduce the operation of active filters in education, it is a good method to use a software, named SPICE. It is a good choice, because it has a high level of objects for simulation, and good presentation objects for visualizing the results. Students can easily change the parameters of the operation, and can see the its result instead of using real power electronics circuits. In this paper we would like to use a series active filter as the power factor corrector for a "capacitive input" circuit. ©2010 IEEE.

Open Access: Yes

DOI: 10.1109/CINTI.2010.5672244

Effect of topological defects on graphene geometry and stability

Ibolya Zsoldos

Publication Name: Nanotechnology Science and Applications

Publication Date: 2010-12-01

Volume: 3

Issue: 1

Page Range: 101-106

Description:

The effect of two basic topological defects, mitosis and the Stone-Wales defect, is studied in the graphene structure. The topological rules of the curvatures due to the occurrence of the defects in different arrangements are determined. Despite the fact that the causes and the probability of these topological defects are not known today, this theoretical work studies the distortions caused by the defects geometry and stability of the graphene structure. © 2010 Zsoldos, publisher and licensee Dove Medical Press Ltd.

Open Access: Yes

DOI: 10.2147/NSA.S13905

Fuzzy communication in collaboration of intelligent agents

Áron Ballagi László T. Kóczy

Publication Name: Proceedings of the 9th Wseas International Conference on Applied Computer and Applied Computational Science Acacos 10

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 208-214

Description:

This paper presents some examples for fuzzy communication and intention guessing from the real life to the cooperation of intelligent mobile robots. In a special experimental environment a new communication approach is investigated for intelligent cooperation of autonomous mobile robots. Effective, fast and compact communication is one of the most important cornerstones of a high-end cooperating system. In this paper we propose a fuzzy communication system where the codebooks are built up by fuzzy signatures. We use cooperating autonomous mobile robots to solve some logistic problems.

Open Access: Yes

DOI: DOI not available

Comparative study of the corrosion and surface chemical effects of the decontamination technologies

Krisztián Radó Gábor Patek Bernadett Baja Emese H. Deák Andrea Szabó Nagy Varga Kálmán Zoltán Németh Schunk János

Publication Name: Journal of Radioanalytical and Nuclear Chemistry

Publication Date: 2010-12-01

Volume: 286

Issue: 3

Page Range: 815-821

Description:

Decontamination technologies are generally developed to reduce the collective dose of the maintenance and operation personnel at nuclear power plants (NPP). The highest efficiency (i.e., the highest decontamination factors) available without detrimental modification of the treated surface of structural material is the most important goal in the course of the application of a decontamination technology. At the Paks NPP the AP-CITROX procedure has been utilized for the decontamination of the primary coolant circuit's components (e.g., main circulating pump (MCP) and steam generators (SGs)). Our previous studies have revealed that a 'hybrid' structure of the amorphous and crystalline phases was formed in the outermost surface region of the austenitic stainless steel tubes of SGs as an undesired consequence of the industrial application of the AP-CITROX decontamination technology during the period of 1993-2001. In this paper, we report some comparative findings on the corrosion and surface chemical effects of the AP-CITROX procedure and the novel decontamination technology elaborated at our institution. On optimizing the operational parameters the latter technology may become suitable for the effective decontamination of both dismountable (e.g., MCP swivel) and separable (e.g., SGs) equipments. For this purpose experiments were performed. In this laboratory scale experiments, the passivity, morphology and chemical compositions of the treated surfaces of tube specimens were investigated by voltammetry, and SEM-EDX methods, respectively. The SEM-EDX results have revealed that the oxide removal is surprisingly uniform even after 2 or 3 consecutive cycles. The electrochemical studies have provided evidences that no unfavorable tendencies in the general corrosion state of the tube samples can be detected in the course of the chemical treatments. © 2010 Akadémiai Kiadó, Budapest, Hungary.

Open Access: Yes

DOI: 10.1007/s10967-010-0761-8

Function approximation performance of Fuzzy Neural Networks based on frequently used fuzzy operations and a pair of new trigonometric norms

László Gál Rita Lovassy László T. Kóczy

Publication Name: 2010 IEEE World Congress on Computational Intelligence Wcci 2010

Publication Date: 2010-11-25

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

A new triangular t-norm and t-conorm are presented. The new fuzzy operations combined with the standard negation are applied in a practical problem, namely, they are proposed as suitable triangular norms for defining a fuzzy flip-flop based neuron. Other fuzzy J-K and D flip-flop based neurons are constructed by using algebraic, Lukasiewicz, Yager, Dombi and Hamacher connectives. The function approximation performance of a Fuzzy Neural Networks (FNN) built up from various fuzzy neurons are evaluated using six increasingly more complicated problems: various sine waves, battery cell charging characteristics, two dimensional trigonometric functions and a six dimensional benchmark problem. It is shown that the new norms lead to FNNs with better approximation properties in some cases than all the previous ones. © 2010 IEEE.

Open Access: Yes

DOI: 10.1109/FUZZY.2010.5584252