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Found 6278 publications

A new remarkable representative of Uropodina mites from Seychelles (Acari, Mesostigmata, Trematuridae)

Sergey G. Ermilov Jenő Kontschán

Publication Name: Zookeys

Publication Date: 2025-01-01

Volume: 1229

Issue: Unknown

Page Range: 289-296

Description:

A new genus, Trematirunella gen. nov. (Mesostigmata: Uropodina: Trematuridae), with Trematirunella seychellia sp. nov. as its type species, is described, based on a female, males, and deutonymphs collected in soil samples from the Seychelle Islands. The new genus belongs to the family Trematuridae based on the shape of the corniculi, gnathosomal setae, tritosternum and chelicerae. Members of the new genus bear a preanal suture on the ventral shield, two pairs or more pairs of wide, robust and sword-like setae on the caudal part of the dorsal shield, very dense setation on the caudal area of the marginal shield and an incision on the anterior part of the dorsal shield. These characters are missing in the other genera of Trematuridae. Two previously described species (Trichouropoda lagunae Hirmatsu & Hirschmann, 1988 and Trichouropoda palawanensis Hirschmann & Hirmatsu, 1990) from the Philippines are transferred to the new genus, as Trematirunella lagunae (Hirmatsu & Hirschmann, 1988), comb. nov. and Trematirunella palawanensis (Hirschmann & Hirmatsu, 1990), comb. nov. The new species differs from its congeners in the sculptural pattern of the female genital shield and in the shape of the robust and sword-like setae on the caudal area of the dorsal shield.

Open Access: Yes

DOI: 10.3897/zookeys.1229.142822

In the footsteps of Artificial Intelligence : EExamining logical relationships between employee turnover and behavior patterns

Bernadett Domokos Zoltán Baracskai

Publication Name: 11th IEEE International Conference on Cognitive Infocommunications Coginfocom 2020 Proceedings

Publication Date: 2020-09-23

Volume: Unknown

Issue: Unknown

Page Range: 569-572

Description:

In this study, the initial problem is the capacity of the human mind to set up a conceptual model. The novelty of this article is that we show that defined concepts created by the human mind can be passed on to an artificial intelligence-based expert system. The expert system helps the human mind to settle the logical connections between the defined terms and the conceptual model thus the created model will be better than what man could have set up without an expert system. These articles have examined the impact of employee turnover in countless aspects as one of potential index of a corporation. As a starting point for our research, we systematically reviewed the literature on employee turnover and selected six concepts that are bilaterally related to our phenomenon. Based on the terms and the correlation of it, we created a conceptual model that was examined with the help of an artificial intelligence-based system. Based on our experience in observing, consulting, and working with decision-makers, we examined the aspects of employee turnover phenomenon in the analysis. This was performed using a rule-based system, which used logical rules and found classical 'if-then' connections in the employee behavior cases. According to our examination, our outcomes can provide credible results for further research activities as well as for practitioners.

Open Access: Yes

DOI: 10.1109/CogInfoCom50765.2020.9237862

Separated antecedent and consequent learning for Takagi-Sugeno fuzzy systems

János Botzheim Tamás D. Gedeon Erich Peter Klement Edwin Lughofer László T. Kóczy

Publication Name: IEEE International Conference on Fuzzy Systems

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 2263-2269

Description:

In this paper a new algorithm for the learning of Takagi-Sugeno fuzzy systems is introduced. In the algorithm different learning techniques are applied for the antecedent and the consequent parameters of the fuzzy system. We propose a hybrid method for the antecedent parameters learning based on the combination of the Bacterial Evolutionary Algorithm (BEA) and the Levenberg-Marquardt (LM) method. For the linear parameters in fuzzy systems appearing in the rule consequents the Least Squares (LS) and the Recursive Least Squares (RLS) techniques are applied, which will lead to a global optimal solution of linear parameter vectors in the least squares sense. Therefore a better performance can be guaranteed than with a complete learning by BEA and LM. The paper is concluded by evaluation results based on high-dimensional test data. These evaluation results compare the new method with some conventional fuzzy training methods with respect to approximation accuracy and model complexity. © 2006 IEEE.

Open Access: Yes

DOI: 10.1109/FUZZY.2006.1682014

Rapid tooling by laser powder deposition: Process simulation using finite element analysis

L. Costa Augusto Moita De Deus Tamás Réti R. Vilar

Publication Name: Acta Materialia

Publication Date: 2005-08-01

Volume: 53

Issue: 14

Page Range: 3987-3999

Description:

Laser powder deposition (LPD) is a rapid manufacturing process, whereby near-net-shape components are fabricated by the successive overlapping of layers of laser melted and resolidified material. As new layers of material are deposited, heat is conducted away from recently resolidified material, through the previously deposited layers, inducing cyclic thermal fluctuations in the part as it is built up. These thermal cycles can activate a variety of metallurgical phenomena, such as solid-state transformations, leading to a progressive modification of the material's microstructure and properties. Since the thermal history of the material in the deposited part will differ from point to point and depends on the deposition parameters and build-up strategy, the finished part may present complex distributions of microstructure and properties. In order to achieve the best properties, the deposition process must be optimized and, given its complexity, this optimization can only be effectively done using mathematical simulation methods. In this paper a thermo-kinetic LPD model coupling finite element heat transfer calculations with transformation kinetics and quantitative property-structure relationships is presented. This model was applied to the study of the influence of substrate size and idle time between the deposition of consecutive layers on the microstructure and hardness of a ten-layer AISI 420 steel wall built by LPD. The results show that the thermal history and, hence, the microstructure and properties of the final part, depend significantly on these parameters. © 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.actamat.2005.05.003

Optimal Monotonicity-Preserving Perturbations of a Given Runge–Kutta Method

Tihamér A. Kocsis Inmaculada Higueras David I. Ketcheson

Publication Name: Journal of Scientific Computing

Publication Date: 2018-09-01

Volume: 76

Issue: 3

Page Range: 1337-1369

Description:

Perturbed Runge–Kutta methods (also referred to as downwind Runge–Kutta methods) can guarantee monotonicity preservation under larger step sizes relative to their traditional Runge–Kutta counterparts. In this paper we study the question of how to optimally perturb a given method in order to increase the radius of absolute monotonicity (a.m.). We prove that for methods with zero radius of a.m., it is always possible to give a perturbation with positive radius. We first study methods for linear problems and then methods for nonlinear problems. In each case, we prove upper bounds on the radius of a.m., and provide algorithms to compute optimal perturbations. We also provide optimal perturbations for many known methods.

Open Access: Yes

DOI: 10.1007/s10915-018-0664-3

Level of presence in max where virtual reality

Borbála Berki

Publication Name: 11th IEEE International Conference on Cognitive Infocommunications Coginfocom 2020 Proceedings

Publication Date: 2020-09-23

Volume: Unknown

Issue: Unknown

Page Range: 485-490

Description:

Presence is the sense of being inside a virtual environment, that can be experienced also in desktop virtual realities not only in full-immersive VRs. MaxWhere is a desktop virtual reality that is used in education and for collaborative work. This VR can be considered as a 3D browser because in the space there are several smartboards where any web-content, document, or image can be displayed. This study compares the sense of presence in MaxWhere virtual reality to other desktop virtual realities with the Igroup Presence Questionnaire. This VR is in focus of numerous scientific research, thus this comparison of presence level could be a great starting point for them. The analysis showed that the level of presence in MaxWhere virtual reality corresponds to the average presence level in other desktop virtual realities. The analysis of the presence profile has shown that the general sense of presence and the spatial presence are relatively high in this VR. The experienced realism scale is the lowest because this VR is designed to foster working and learning inside the virtual space and not for having a high fidelity.

Open Access: Yes

DOI: 10.1109/CogInfoCom50765.2020.9237826

Socio-demographic correlates of financial risk-taking, diligence and satisfaction of the population, 2022

Németh Erzsébet Módosné Szalai Szilvia Jenei Szonja

Publication Name: Teruleti Statisztika

Publication Date: 2025-01-01

Volume: 65

Issue: 4

Page Range: 474-501

Description:

The study examines the relationship between financial diligence, risk tolerance, and financial situation assessment, as well as their correlations with various socio-demographic factors. The authors used the 2022 Hungarian dataset from the OECD’s (Organisation for Economic Co-operation and Development) recurring international financial literacy survey for their analysis. The results indicate that respondents generally monitor their finances carefully, tend to avoid risks, and report low levels of satisfaction. A moderately strong positive relationship exists between the dimensions of financial behavior. This suggests that both diligence and appropriate risk management are crucial for financial awareness and contribute to financial satisfaction. Through cluster analysis, ten well-distinguished groups were identified differing in financial behavior and attitudes. Differences between the clusters highlight that socio-demographic factors – such as age, income, type of residence, and employment status – fundamentally influence individuals' financial decision-making.

Open Access: Yes

DOI: 10.15196/TS650403

Li-BES detection system for plasma turbulence measurements on the COMPASS tokamak

M. Berta G. Anda D. Dunai P. Hacek D. Réfy A. Kovácsik J. Krbec M. Hron G. Veres R. Pánek S. Zoletnik A. Bencze V. Weinzettl

Publication Name: Fusion Engineering and Design

Publication Date: 2015-10-01

Volume: 96-97

Issue: Unknown

Page Range: 795-798

Description:

A new Li beam emission spectroscopy (Li-BES) diagnostic system with a ∼ cm spatial resolution, and with beam energy ranging from 10 keV up to 120 keV and a 18 channel Avalanche photo diode (APD) detector system sampled at 2 MHz has been recently installed and tested on the COMPASS tokamak. This diagnostic allows to reconstruct density profile based on directly measured light profiles, and to follow turbulent behaviour of the edge plasma. The paper reports technical capabilities of this new system designed for fine spatio-temporal measurements of plasma electron density. Focusing on turbulence-induced fluctuation measurements, we demonstrate how physically relevant information can be extracted using the COMPASS Li-BES system.

Open Access: Yes

DOI: 10.1016/j.fusengdes.2015.06.030

Probabilistic correlation coefficients for possibility distributions

István Harmati Peter Varlaki Robert Fuller

Publication Name: Ines 2011 15th International Conference on Intelligent Engineering Systems Proceedings

Publication Date: 2011-08-22

Volume: Unknown

Issue: Unknown

Page Range: 153-158

Description:

The goal of this paper to introduce two alternative definitions for the possibilistic correlation coefficient by equipping the level sets of a joint possibility distribution with nonuniform probability distributions which are directly derived from the shape function of the joint possibility distribution. We also show some examples for their exact calculation for joint possibility distributions defined by Mamdani, Łukasiewicz and Larsen triangular norms. © 2011 IEEE.

Open Access: Yes

DOI: 10.1109/INES.2011.5954737