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Found 6289 publications

New parameterizable search space narrowing technique for adjusting between accuracy and interpretability in fuzzy systems

Krisztián Balázs László T. Kóczy

Publication Name: Cinti 2012 13th IEEE International Symposium on Computational Intelligence and Informatics Proceedings

Publication Date: 2012-12-01

Volume: Unknown

Issue: Unknown

Page Range: 323-328

Description:

It is well known that beyond the fact that fuzzy systems have favorable modeling capabilities from the viewpoint of accuracy, they also have outstanding inherent interpretability possibilities, which is a rather unique property among modeling architectures and which is a strong motivation for their research and application. This paper focuses on both mentioned property types and proposes a new technique for adjusting between accuracy and interpretability in modeling systems where fuzzy rule based architectures together with evolutionary algorithms are used for knowledge extraction. First, an inconsistency problem of conventional interpretable fuzzy systems is resolved. Then, a new search space narrowing technique for evolutionary algorithms is proposed, which can be applied for constructing interpretable fuzzy rule bases. Finally, the favorable properties of this new approach will be verified experimentally by carrying out simulation runs. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/CINTI.2012.6496783

A numerical method for creating and reconstructing computer-generated holograms

Lotfi Abdelhakim

Publication Name: Aip Conference Proceedings

Publication Date: 2012-12-01

Volume: 1479

Issue: 1

Page Range: 2182-2186

Description:

The main purpose of this article is to develop a program package which generates artificial holograms by numerical methods and these computer generated holograms are numerically reconstructed. For the calculation of light propagation needed in the generation of holograms or in the reconstruction of the object from the hologram, we use two strategies. The first is the Fourier-based algorithm where the diffraction integral is approximated as a convolution integral, allowing computation using the fast Fourier transform algorithm. The second uses finite difference discretization to solve the parabolic wave equation. Numerical tests that assess the accuracy of these algorithms are presented. © 2012 American Institute of Physics.

Open Access: Yes

DOI: 10.1063/1.4756625

Pantoprazole before endoscopy in patients with gastroduodenal ulcer bleeding: Does the duration of infusion and ulcer location influence the effects?

Milán Szalai Tibor Kárász Istvan Racz Nora Dancs Andrea Szabó Zoltán Horváth Mihaly Csöndes

Publication Name: Gastroenterology Research and Practice

Publication Date: 2012-11-19

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The aim of this study was to investigate the effect of preemptive pantoprazole infusion on early endoscopic findings in patients with acute ulcer bleeding. Records of 333 patients admitted with acute ulcer bleeding were analyzed. Ulcer bleeders were given either 80 mg bolus of pantoprazole followed by continuous infusion of 8 mg per hour or saline infusion until endoscopy. In 93 patients saline infusion whereas in 240 patients bolus plus infusion of pantoprazole was administrated with mean (±SD) durations of 5.45±12.9 hours and 6.9±13.2 hours, respectively (P=0.29). Actively bleeding ulcers were detected in 46/240 (19.2) of cases in the pantoprazole group as compared with 23/93 (24.7) in the saline infusion group (P=0.26). Different durations of pantoprazole infusion (04 hours, >4 hours, and >6 hours) had no significant effect on endoscopic and clinical outcome parameters in duodenal ulcer bleeders. Gastric ulcer bleeders on pantoprazole infusion longer than 4 and 6 hours before endoscopy had actively bleeding ulcers in 4.3 and 5 compared to the 19.5 active bleeding rate in the saline group (P=0.02 and P=0.04). Preemptive infusion of high-dose pantoprazole longer than 4 hours before endoscopy decreased the ratio of active bleeding only in gastric but not in duodenal ulcer patients. © 2012 Istvan Rácz et al.

Open Access: Yes

DOI: 10.1155/2012/561207

Novel design of cognitive system strategies

Claudiu Radu Pozna Radu Emil Precup

Publication Name: Lindi 2012 4th IEEE International Symposium on Logistics and Industrial Informatics Proceedings

Publication Date: 2012-11-06

Volume: Unknown

Issue: Unknown

Page Range: 205-214

Description:

This paper presents results related to a new design approach dedicated to cognitive system strategies. The scenario concerning a robot integrated in a cognitive system is described. The paper focuses on the development of a pattern of human knowledge and on a new data structure which are able to organize and manipulate the involved information. The definitions of signatures and of signature classes are given as one of the first steps in an alternative modeling approach to the observation process. The paper ends with an example that deals with using the signatures in the observation. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/LINDI.2012.6319489

Comparing the efficiency of a fuzzy single-stroke character recognizer with various parameter values

A. Tormási László T. Kóczy

Publication Name: Communications in Computer and Information Science

Publication Date: 2012-11-02

Volume: 297 CCIS

Issue: PART 1

Page Range: 260-269

Description:

In this paper the results of a study on the accuracy of a fuzzy logic-based single-stroke character recognizer are presented by refining various parameter values, such as resolution of the fuzzy grid and the minimum distance between sampled points. The symbol set is a modified version of Palm's Graffiti single-stroke alphabet and it contains 26 different symbols. Each symbol is represented by a single fuzzy rule. The rule base was determined by a subset of the collected samples. 99.4% recognition rate has been achieved with the initial rule base, without training. With the revised parameter values the accuracy is close or even slightly beyond the results of other academic or commercial systems. © 2012 Springer-Verlag Berlin Heidelberg.

Open Access: Yes

DOI: 10.1007/978-3-642-31709-5_27

Optimization of strategic level performance measurement and decision making using artificial neural network

János Botzheim Peter Foldesi Csaba Tápler P. Németh

Publication Name: 2012 IEEE International Technology Management Conference Itmc 2012

Publication Date: 2012-11-01

Volume: Unknown

Issue: Unknown

Page Range: 93-97

Description:

In our paper we propose a new method for the strategic level performance measurement and decision making by presenting two case studies performed in 2011. We proposed a computational intelligence method to establish connection between basic operational level data and important strategic level indicators. In the first case study this indicator is related to performance measurement. In the second case study the indicator is the contribution margin of the given company. After the introduction we present the process of programming and learning with actual company data. Finally an evaluation of the results is presented based on the program runs. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/ITMC.2012.6306360

Genetic and bacterial memetic programming approaches in hierarchical-interpolative fuzzy system construction

Krisztián Balázs László T. Kóczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2012-10-23

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

As a straightforward continuation of our previous work in this paper new memetic (combined evolutionary and gradient based) methods are proposed for constructing hierarchical-interpolative fuzzy rule bases in the frame of a supervised machine learning system modeling black box systems defined by input-output pairs. In this work the resulting hierarchical rule bases are constructed by using structure building Genetic and Bacterial Memetic Programming Algorithms, thus stochastic evolutionary optimization methods containing deterministic local search steps. Applying hierarchical-interpolative fuzzy rule bases has proved an efficient way of reducing the complexity of knowledge bases, whereas memetic techniques often ensure a relatively fast convergence in the learning process. The literature has highlighted the advantages of memetic methods against pure evolutionary algorithms, thus the combination of hierarchical-interpolative fuzzy rule bases with memetic techniques may form promising hierarchical-interpolative machine learning systems. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/FUZZ-IEEE.2012.6251218

A fuzzy bacterial evolutionary solution for crisp three-dimensional bin packing problems

Peter Foldesi Dányádi Zsolt László T. Kóczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2012-10-23

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper presents an evolutionary quasi-solution for a problem commonly occurring in practical logistics, the three-dimensional version of the bin packing problem. The algorithm presented here is a variation of the bacterial evolutionary approach, and utilizes fuzzy logic in the fitness calculation. The goal is to give a useful alternative method to the basic problem, and to demonstrate that the addition of fuzzy logic elements to the fitness function increases the speed of the evolutionary process. The paper first describes the specific problem, then moves on to the details of every key part of the algorithm. Finally, the results from a number of test runs are used to show the general efficiency, and the contrast between the crisp and fuzzy fitness functions. It is clearly shown that the application of fuzzy approach in the fitness function can improve the speed of convergence, so the fuzzy logic can be helpful even in solving crisp problems. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/FUZZ-IEEE.2012.6251262

Evaluation of vibrating sound transducers with glass membrane based on measurements and numerical simulations

György Wersényi

Publication Name: 132nd Audio Engineering Society Convention 2012

Publication Date: 2012-10-22

Volume: Unknown

Issue: Unknown

Page Range: 477-482

Description:

In recent years manufacturers introduced so-called "invisible sound" solutions. In-wall, surface mount or glass mount versions of different vibrating transducers are commercially available. The entire surface becomes a speaker delivering sound and the frequency response is said to be equivalent to conventional diaphragm speakers. Furthermore, the sound is omni directional at nearly all frequencies (60 Hz - 15 kHz) while channel separation is maintained. This paper presents measurement results of the SolidDrive SD1g transducer mounted on different glass surfaces, including vibration measurements and acoustic parameters. Furthermore, based on a numerical FEM-model using COMSOL, comparison between measured and simulated results and estimation of transfer function and directional characteristics are presented.

Open Access: Yes

DOI: DOI not available