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Found 6278 publications

Context recognition in mobile robots cooperation using fuzzy signature

No authors available

Publication Name: International Conference on Theoretical and Mathematical Foundations of Computer Science 2010, TMFCS 2010

Publication Date: 2010-12-01

Volume:

Issue:

Page Range: 110-115

Description:

Robots cooperation means also to define the commune task. In order to understand their cooperation the robots must have complete knowledge about all possible states of the work or to understand the context by extract useful information from observation. Present paper focus on the second possibility. We propose a strategy of information extraction and context understanding based on an original data structure, the fuzzy signature and on a priori knowledge, the robot codebook. The paper starts by presenting the concept of the fuzzy signature and exemplify the idea of cooperation by context understanding.

Open Access: No

DOI: DOI not available

On the measurement and evaluation of bass enhanced in-ear phones

No authors available

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: 4

Issue:

Page Range: 2849-2854

Description:

Measurements of the transfer function of headphones and earphones are made on dummy-heads or on ear simulators. This paper introduces measurement problems of newly designed in-ear phones, often called as micro-driver equipment. These earphones have smaller transducer diameter and are equipped with rubber or spongy material to fit in the ear canal. This coupling may create an increased sound isolation, less sound pressure and a better low frequency transmission to the eardrum. The paper presents subjective evaluation of listeners who evaluated five different kinds of in-ear phones as well as transfer function measurements using a dummy-head. Measurement problems are highlighted pointing on new aspects of a revised dummy-head standard. Copyright © (2010) by the International Congress on Acoustics.

Open Access: No

DOI: DOI not available

Overview and comparative results of speech-based excitation signals for virtual localization and real-life applications

No authors available

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: 5

Issue:

Page Range: 3885-3889

Description:

In virtual audio synthesis we use different excitation signals for listening tests. These tests are executed using headphone playback and real-time HRTF synthesis. Besides noise signals, speech is often used for tests especially for real life applications, such as mobile phones, various voice transmission lines, computer environments or accessories for the visually impaired, where speech intelligibility is important. This paper presents a summary of results of a listening test using different signals including speech in a virtual audio environment aimed at blind persons. Results show how speech contributes to the accessibility to computers and performs in a comparative test for virtual audio simulation. Furthermore, additional speech test signals are overviewed and introduced, such as speech-chorus signals, segmented spondees and the newly developed spearcons.

Open Access: No

DOI: DOI not available

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

No authors available

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:

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: No

DOI: DOI not available

Application of LPV type force model in vehicle crash dynamics

István Harmati András Rövid Peter Varlaki

Publication Name: Proceedings of the 9th Wseas International Conference on Applications of Computer Engineering Ace 10

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 174-179

Description:

In the research field of vehicle crash mechanics one of the most important task is finding a model for the deformational force, which gives acceptable approximation, but doesn't need perfect knowledge about the parameters of the vehicle. The FEM based methods, which are applied in the engineering practice give good approximations, but they have extremely large computational complexity and need a large amount of data. On the other hand there exist simple force models, but they not approximate well in details the force-deflection curve. In this paper we introduce a force model for vehicle deformation based on the LPV-HOSVD paradigm, which well approximates the force during the deformational process and has acceptable complexity.

Open Access: Yes

DOI: DOI not available

Experimental and numerical investigation of internally reinforced damaged pipelines

No authors available

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

Publication Date: 2010-12-01

Volume:

Issue:

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: No

DOI: DOI not available

A remark on adaptive scheduling of optimization algorithms

Krisztián Balázs László T. Kóczy

Publication Name: Communications in Computer and Information Science

Publication Date: 2010-12-01

Volume: 81 PART 2

Issue: Unknown

Page Range: 719-728

Description:

In this paper the scheduling problem of optimization algorithms is defined. This problem is about scheduling numerical optimization methods from a set of iterative 'oracle-based' techniques in order to obtain an as efficient as possible optimization process based on the given set of algorithms. Statements are formulated and proven about the scheduling problem and methods are proposed to solve this problem. The applicability of one of the proposed methods is demonstrated through a simple fuzzy rule based machine learning example. © Springer-Verlag Berlin Heidelberg 2010.

Open Access: Yes

DOI: 10.1007/978-3-642-14058-7_74

Lattice BGK simulation of multipolar vortex: Formation

Gábor Tóth Gábor Házi

Publication Name: Advances in Applied Mathematics and Mechanics

Publication Date: 2010-12-01

Volume: 2

Issue: 5

Page Range: 533-544

Description:

Analytical and numerical studies have shown that multipolar vortices can emerge in two-dimensional flow due to azimuthal normal mode perturbations of shielded vortices. It has been found that mode 2 and 3 perturbations can lead to the formation of stable tripoles and quadrapoles, respectively, while higher order modes result in more complex unstable compound vortices. We have used the lattice Boltzmann method to simulate the effect of azimuthal perturbations on shielded vortices at moderate Reynolds numbers. We have found that azimuthal normal mode perturbations result in the formation of multipoles, which decay due to viscous dissipation. We could also observe that the outcome of such simulations is very sensitive to the displacement of perturbations above wavenumber-3 excitations, in spite of the significant viscosity we used. © 2010 Global Science Press.

Open Access: Yes

DOI: 10.4208/aamm.10-10S01

Architectural web portal and interactive CAD learning in Hungary

Attila Somfai

Publication Name: Web Based Engineering Education Critical Design and Effective Tools

Publication Date: 2010-12-01

Volume: Unknown

Issue: Unknown

Page Range: 20-29

Description:

It is opportune to show the teaching web portal of the Faculty of Architecture at "Széchenyi István" University (www.arc.sze.hu/indexen.html), its conformation and use. Nowadays, the Internet helps to look into Hungarian and foreign study aids, architectural websites, and novelties. The Internet has created potential new and effective ways of cooperation between lecturers and students of the university and other institutions of higher education. The teaching web portal mentioned above realizes the diversity and complexity of architecture with efficient grouping of information, and is attentive to high professional standards. Computer Aided Architectural Modeling (www.arc.sze.hu/cad) is one of the new types of online lecture notes, where many narrated screen capture videos show the proper usage of CAD software instead of text and figures. This interactive type of learning helps students become more independent learners. This type of teaching modality provides the opportunity for students who need more time to acquire subject matter by viewing video examples again. Success of our departments' common web initiations can be measured through Internet statistics and feedback of the students and external professionals. © 2010, IGI Global.

Open Access: Yes

DOI: 10.4018/978-1-61520-659-9.ch002