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Found 6289 publications

Training electrical engineers on asynchronous logic circuits based on constant weight codes

Gabor Rozsa A. Nagy P. Keresztes László T. Kóczy

Publication Name: IEEE AFRICON Conference

Publication Date: 2011-12-12

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The paper introduces a new way for teaching of delay insensitive asynchronous logic circuits. The studies start on high level models, which are VHDL implementations of Dennis-type static dataflow systems. Investigating the operation of the concurrent processes of these models, the main elements of the delay insensitive systems can be derived. Introducing constant weight 'm-of-n' codes immediately at the beginning of the course leads to a proper generalization. So the well known dual-rail code circuits can be considered as special cases of the constant weight code delay insensitive circuits. The paper presents briefly the design practice sessions for students. © 2011 IEEE.

Open Access: Yes

DOI: 10.1109/AFRCON.2011.6072041

Parallel finite element method

Miklós Kuczmann

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2011-12-07

Volume: 87

Issue: 12 B

Page Range: 100-102

Description:

The paper presents the domain decomposition method as a tool to cut the finite element mesh into smaller sub-meshes. Smaller mass matrices can be assembled and solved in a parallel way, i.e. the solution time can be decreased by this method. The finite element method has been chosen as a numerical tool to present the applicability of the technique.

Open Access: Yes

DOI: DOI not available

Applications of the conjugate gradient method for implicit feedback collaborative filtering

Istvan Pilaszy Gabor Takacs Domonkos Tikk

Publication Name: Recsys 11 Proceedings of the 5th ACM Conference on Recommender Systems

Publication Date: 2011-12-06

Volume: Unknown

Issue: Unknown

Page Range: 297-300

Description:

The need for solving weighted ridge regression (WRR) problems arises in a number of collaborative filtering (CF) algorithms. Often, there is not enough time to calculate the exact solution of the WRR problem, or it is not required. The conjugate gradient (CG) method is a state-of-the-art approach for the approximate solution of WRR problems. In this paper, we investigate some applications of the CG method for new and existing implicit feedback CF models. We demonstrate through experiments on the Netflix dataset that CG can be an efficient tool for training implicit feedback CF models. © 2011 ACM.

Open Access: Yes

DOI: 10.1145/2043932.2043987

Optimal design of extrusion dies in metal forming using the finite element method

No authors available

Publication Name: Proceedings of the 13th International Conference on Civil, Structural and Environmental Engineering Computing

Publication Date: 2011-12-01

Volume:

Issue:

Page Range: Unknown

Description:

In this paper, a method for calculation of the optimal shapes of axisymmetrical converging dies using the finite element method is presented. The shape optimization problem considered in this paper is to find the best shape of the die such that the flow rate will be uniform at the die exit. The optimization problem is to minimize an objective function by varying a part of boundary (ie: the shape of die) subject to constraints imposed by the metal forming problem. In this method, B-spline functions allow us to determine the shape of the die, using its control points as design variables. © Civil-Comp Press, 2011.

Open Access: No

DOI: DOI not available

Application of evolutionary algorithms for energy efficient building design

No authors available

Publication Name: IWACIII 2011 - International Workshop on Advanced Computational Intelligence and Intelligent Informatics, Proceedings

Publication Date: 2011-12-01

Volume:

Issue:

Page Range: Unknown

Description:

The topic of energy efficient building design is an attractive philosophy in the era of diminishing fossil energy sources drained by the ever increasing thirst of the Earth's population for energy. In this paper we propose to apply evolutionary algorithms aiding the design of energy efficient buildings. We employ a simple mathematical model involving a large number of parameters. Energy efficiency is defined in terms of these parameters through algebraic evaluations. The quasi-optimal values of the fitness function representing the level of energy efficiency are obtained by Bacterial Evolutionary Algorithms. Results indicate that in the case of a prescribed total construction cost close to 80% improvement can be achieved in terms of energy efficiency. On the other hand, if one targets a prescribed energy efficiency, more than 30% of the total construction costs can be saved by proper optimization.

Open Access: No

DOI: DOI not available

Displacement measurement by digital holographic interferometry

No authors available

Publication Name: Proceedings of the 13th International Conference on Civil, Structural and Environmental Engineering Computing

Publication Date: 2011-12-01

Volume:

Issue:

Page Range: Unknown

Description:

Digital holographic interferometry is a useful technique for measuring the deformation or displacement of the surface of an object by recording at least two speckle patterns, one before and one after the object is deformed. Holographic interferometry utilizes interference between the speckled image of an object illuminated by a laser and a reference beam derived from the same laser. Any change in the shape of the object results in local changes in the intensity distribution in the holographic fringe pattern. The holograms are generated directly on a charge coupled device (CCD) target and stored electronically. The speckle patterns can be taken quickly and analyzed using holographic interferometry and the Fourier transform method. © Civil-Comp Press, 2011.

Open Access: No

DOI: DOI not available

Application of evolutionary algorithms for energy efficient building design

János Botzheim Attila Talamon János Balázs Mihály Retek Árpád Csík Tamás Csoknyai

Publication Name: Iwaciii 2011 International Workshop on Advanced Computational Intelligence and Intelligent Informatics Proceedings

Publication Date: 2011-12-01

Volume: Unknown

Issue: Unknown

Page Range: 6

Description:

The topic of energy efficient building design is an attractive philosophy in the era of diminishing fossil energy sources drained by the ever increasing thirst of the Earth's population for energy. In this paper we propose to apply evolutionary algorithms aiding the design of energy efficient buildings. We employ a simple mathematical model involving a large number of parameters. Energy efficiency is defined in terms of these parameters through algebraic evaluations. The quasi-optimal values of the fitness function representing the level of energy efficiency are obtained by Bacterial Evolutionary Algorithms. Results indicate that in the case of a prescribed total construction cost close to 80% improvement can be achieved in terms of energy efficiency. On the other hand, if one targets a prescribed energy efficiency, more than 30% of the total construction costs can be saved by proper optimization.

Open Access: Yes

DOI: DOI not available

Historical origin of the fine structure constant: Part III: Pauli with Jung Retro-Cognizes St. Stephen's crowning achievement

Peter Varlaki László T. Kóczy Imre J. Rudas

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2011-12-01

Volume: 8

Issue: 6

Page Range: 43-78

Description:

In Part II of the paper we discussed the central role of the number-archetype 137 in some great medieval works related to St Stephen's court. On the basis of the hermeneutical interpretation of certain of Pauli's famous dream series, we intend to show his hypothetical "synchronistic (unconscious) recognition" of the dominant representations and meanings of the medieval works discussed in the earlier parts of this paper, which can be related to his isomorphic mythological and "physical" dream patterns. We can also conclude that Pauli, collaborating with Jung, himself confirms in his consistent "dream-messages" the symbolic meaningful relationship and structural isomorphy between the basic quantum-physical model's features (e.g. the fine structure constant) and their hypothetical primordial images appearing even in the actual medieval works.

Open Access: Yes

DOI: DOI not available

Test generation and computational complexity

Jozsef Sziray

Publication Name: Proceedings of IEEE Pacific Rim International Symposium on Dependable Computing Prdc

Publication Date: 2011-12-01

Volume: Unknown

Issue: Unknown

Page Range: 286-287

Description:

The paper is concerned with analyzing and comparing two exact algorithms from the viewpoint of computational complexity. They are: composite justification and the D-algorithm. Both serve for calculating fault-detection tests of digital circuits. As a result, it is pointed out that the composite justification requires significantly less computational step than the D-algorithm. From this fact it has been conjectured that possibly no other algorithm is available in this field with fewer computational steps. If the claim holds, then it follows directly that the test-generation problem is of exponential time, and so are all the other NP-complete problems in the field of computation theory. © 2011 IEEE.

Open Access: Yes

DOI: 10.1109/PRDC.2011.40