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Found 6273 publications

Logic testing of CMOS structures

No authors available

Publication Name: ICCC 2004 - Second IEEE International Conference on Computational Cybernetics, Proceedings

Publication Date: 2004-12-01

Volume:

Issue:

Page Range: 59-64

Description:

The paper presents a test calculation principle which serves for producing tests of switch-level logic faults in CMOS digital circuits. The considered fault model includes stuck-at-0/1 logic faults on the connecting lines, as well as switch faults in the transistors. Both single and multiple faults are included. The transistor faults manifest themselves in stuck open (open circuit) and stuck short (short circuit) behavior. In this paper only combinational logic circuits are taken into consideration. The calculation principle is comparatively simple. It is based only on successive line-value justification, and it yields an opportunity to be realized by an efficient computer program. ©2004 IEEE.

Open Access: No

DOI: DOI not available

Filtering and contrast enhancement on subtracted direct digital angiograms

No authors available

Publication Name: Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings

Publication Date: 2004-12-01

Volume: 26 II

Issue:

Page Range: 1533-1536

Description:

This paper presents the results of a research related to medical image subtraction algorithms. The selected area is of direct digital X-Ray angiography, where subtraction algorithms are the basis of most acquisition and reviewing protocols. The goal of this research is to analyze the currently existing image subtraction algorithms and to propose a new approach based on the experienced limitations, respectively to develop a new imaging technique that allows both contrast agent and radiation dose reduction. The enhancement of the subtraction algorithms is targeted by two means: a) noise reduction on image frames, b) identification of contrast agent injected regions. Both aspects will be studied based on the analysis of the spatio-temporal signal variation that image pixel intensities represent, therefore the resulting algorithm can not be used real time during image acquisition, but as a post processing technique during review. The temporal variation of pixel intensities was then analyzed and a patter check was followed to identify pixels being part of a contrast agent injected region. This information was used to highlight regions of interest and to increase the contrast in poorly injected areas.

Open Access: No

DOI: DOI not available

Codes in the codons: Construction of a codon/amino acid periodic table and a study of the nature of specific nucleic acid - Protein interactions

No authors available

Publication Name: Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings

Publication Date: 2004-12-01

Volume: 26 IV

Issue:

Page Range: 2860-2863

Description:

The theory of "codon-amino acid coevolution" was first proposed by Woese in 1967. It suggests that there is a stereochemical matching - that is, affinity - between amino acids and certain of the base triplet sequences that code for those amino acids. We have constructed a Common Periodic Table of Codons and Amino Acids, where the Nucleic Acid Table showed perfect axial symmetry for codons and the corresponding Amino Acid Table also displayed periodicity regarding the biochemical properties (charge and hydrophobicity) of the 20 amino acids and the position of the stop signals. The Table indicates that the middle (2nd) amino acid in the codon has a prominent role in determining some of the structural features of the amino acids. The possibility that physical contact between codons and amino acids might exist was tested on restriction enzymes. Many recognition site-like sequences were found in the coding sequences of these enzymes and as many as 73 examples of codon - amino acid co-location were observed in the 7 known 3D structures (December 2003) of endonuclease-nucleic acid complexes. These results indicate that the smallest possible units of specific nucleic acid - protein interaction are indeed the stereochemically compatible codons and amino acids.

Open Access: No

DOI: DOI not available

Geometric construction of carbon nanotube junctions

Ibolya Zsoldos Tamás Réti A. Szasz Gy Kakuk

Publication Name: Modelling and Simulation in Materials Science and Engineering

Publication Date: 2004-11-01

Volume: 12

Issue: 6

Page Range: 1251-1266

Description:

In this work we demonstrate that carbon nanotube junctions with an optional number, type (zigzag and/or armchair) and diameter of tubes can exist. We show a method for geometric construction of their models.

Open Access: Yes

DOI: 10.1088/0965-0393/12/6/017

Boundary interpolation vs boundary elements: Theory and some applications

Csaba Gáspár

Publication Name: International Series on Advances in Boundary Elements

Publication Date: 2004-10-11

Volume: 19

Issue: Unknown

Page Range: 143-152

Description:

Domain and boundary type meshless methods based on the Direct Multi-Elliptic Interpolation Method are presented. The approach is equivalent to a special RBF-method but completely avoids the solution of large, full and ill-conditioned systems, thus, the computational cost is significantly reduced. The method is illustrated through the example of the usual Poisson problem. Both Dirichlet and Neumann boundary conditions are investigated. The domain version of the method results in particular solutions, while the boundary version can be applied to solve homogeneous problems. Along Neumann boundaries, either off-boundary points can be introduced or a boundary reconstruction technique based on boundary interpolation can be applied. Some further possible applications are also outlined.

Open Access: Yes

DOI: DOI not available

Soft computing based car body deformation and EES determination for car crash analysis systems

András Rövid Pál Michelberger Peter Varlaki Annamária R. Várkonyi-Kóczy Maria Da Graça Ruano

Publication Name: Conference Record IEEE Instrumentation and Measurement Technology Conference

Publication Date: 2004-10-08

Volume: 3

Issue: Unknown

Page Range: 1674-1679

Description:

Car body deformation modeling plays a very important role in crash accident analyses, as well as in safe car body design. The determination of the energy absorbed by the deformation and the corresponding Energy Equivalent Speed can be of key importance, however their precise determination is a very difficult task. Although, using the results of crash tests, intelligent and soft methods offer a way to model the crash process itself, as well as to determine the absorbed energy, the before-crash speed of the car, etc. In this paper a modeling technique and an intelligent expert system are introduced which together are able to follow the deformation process of car bodies in car crashes and to analyze the strength of the different parts, thus significantly can contribute to the improvement of the safety of car bodies.

Open Access: Yes

DOI: DOI not available

Soft computing based car body deformation and EES determination for car crash analysis systems

No authors available

Publication Name: Conference Record - IEEE Instrumentation and Measurement Technology Conference

Publication Date: 2004-10-08

Volume: 3

Issue:

Page Range: 1674-1679

Description:

Car body deformation modeling plays a very important role in crash accident analyses, as well as in safe car body design. The determination of the energy absorbed by the deformation and the corresponding Energy Equivalent Speed can be of key importance, however their precise determination is a very difficult task. Although, using the results of crash tests, intelligent and soft methods offer a way to model the crash process itself, as well as to determine the absorbed energy, the before-crash speed of the car, etc. In this paper a modeling technique and an intelligent expert system are introduced which together are able to follow the deformation process of car bodies in car crashes and to analyze the strength of the different parts, thus significantly can contribute to the improvement of the safety of car bodies.

Open Access: No

DOI: DOI not available

A fully symbolic design and modeling of nonlinear glucose control with Control System Professional Suite (CSPS) of Mathematica

B. Benyo Levente Kovács Z. Benyó Béla Paláncz

Publication Name: Acta Physiologica Hungarica

Publication Date: 2004-09-09

Volume: 91

Issue: 2

Page Range: 147-156

Description:

In this case study a fully symbolic design and modeling method are presented for blood glucose control of diabetic patients under intensive care using Mathematica. The analysis is based on a modified two-compartment model proposed by Bergman et al. (2). The applied feedback control law decoupling even the nonlinear model leads to a fully symbolic solution of the closed loop equations. The effectivity of the applied symbolic procedures being mostly built-in the new version of Control System Professional Suite (CSPS) Application of Mathematica have been demonstrated for controller design in case of a glucose control for treatment of diabetes mellitus and also presented for a numerical situation described in Juhász (8). The results are in good agreement with the earlier presented symbolic-numeric analysis by Benyó et al. (1).

Open Access: Yes

DOI: 10.1556/APhysiol.91.2004.2.6

Energy-Conservative Algorithm for the Numerical Solution of Initial-Value Hamiltonian System Problems

E. M. Miletics

Publication Name: Journal of Advanced Computational Intelligence and Intelligent Informatics

Publication Date: 2004-09-01

Volume: 8

Issue: 5

Page Range: 495-498

Description:

The numerical treatment of ODE initial-value problems has been intensively researched. Energy-conservative algorithms are very important to dinamic systems. For the Hamiltonian system the symplectic algorithms are very effective. Powerful computers and algebraic software enable the creation of efficient numerical algorithms for solving ODE initial-value problems. In this paper, we propose an adaptive energy-conservative numerical-analytical algorithm for Hamiltonian systems. This algorithm is adaptable to initial-value problems where some quantities are preserved. The algorithm and its efficiency are presented for solving two-body and linear oscillator problems.

Open Access: Yes

DOI: 10.20965/jaciii.2004.p0495