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Possible Control Methods for Skid-Steer Mobile Robot Platforms

Áron Ballagi Csaba Hajdu Rudolf Krecht

Publication Name: Gpmc 2020 2nd IEEE International Conference on Gridding and Polytope Based Modeling and Control Proceedings

Publication Date: 2020-11-19

Volume: Unknown

Issue: Unknown

Page Range: 31-34

Description:

The aim of this paper is to collect and analyze the possible low-level control methods for skid-steer mobile robot platforms. Most low-level control methods for mobile robots rely on the kinematic or dynamic model of the controlled robot platform. However, in case of skid-steer mobile robots, a precise kinematic or dynamic model might be too costly to be implemented for a control method. Thus, it has an outstanding importance to find a control method which can be precise enough even with a simplified kinematic or dynamic model. The overall control scheme of skid-steer robots is also discussed, along with issues regarding the kinematic and dynamic modelling of the mentioned platforms.

Open Access: Yes

DOI: 10.1109/GPMC50267.2020.9333814

The bases of values in the motivation of the choice of career among professional nursing students and students learning at teacher's training college

Kovácsné Tóth Ágnes

Publication Name: Orvosi Hetilap

Publication Date: 2008-08-24

Volume: 149

Issue: 34

Page Range: 1601-1608

Description:

For the profession of teachers and nurses we need well-trained, highly qualified employees with a sense of vocation. Aim: A comparative analysis of motivation in the choice of career among professional nursing students and teacher-students. Methods: This analysis was done in Hungary among professional nursing students and students participating in teacher training. In this sample 783 students were analysed. Results: In the choice of career of nurses and teachers the primary motivation is of altruistic nature and also the human characteristics of the chosen career. According to genders in the case of female interviewed people we got a higher value than in the case of males in connection with "Helping people". It is more typical in the case of professional nursing students to choose the career as early as in their childhood. Choosing the career at a later age is typical for those who are teacher-students. Conclusion: As a consequence of our rapid economic changes or because of the dissatisfaction caused by career, we have to face the fact that the qualification obtained at a young age will not last till the end of life, the majority of people are forced to change their jobs several times during their lives. In harmonizing the demands of the labour market and education, those people who take part in education and professional training have a favoured role.

Open Access: Yes

DOI: 10.1556/OH.2008.28437

Calculation of magnetic component of wire antenna electromagnetic field

Miklós Kuczmann Yurii Branspiz Mykhaylo Zagirnyak

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2013-03-27

Volume: 89

Issue: 2 B

Page Range: 21-24

Description:

The possibility of analytical solution to calculation of azimuthal component of magnetic field intensity of wire antenna simulated by shortcircuit current is demonstrated. For this purpose boundary condition on a cylindrical surface corresponding to the antenna surface presented by Fourier series is proposed.

Open Access: Yes

DOI: DOI not available

Mechanical Fatigue Test of Individual Dental Implants

Ibolya Zsoldos Ádám Vörös Klaudia Kulcsár Talabérné

Publication Name: Advances in Transdisciplinary Engineering

Publication Date: 2024-01-01

Volume: 59

Issue: Unknown

Page Range: 501-508

Description:

Since subperiosteal dental implants are custom made implants, design and manufacturing must be carried out with great care, solving comprehensive mechanical analyses. In this work, we performed a 3-day fatigue test on a 3D-printed titanium implant in a custom-designed mechanical testing device. After three days of average chewing loading, no residual deformation was observed. Moreover, no cracks or inclusions were observed when examining the CT scans. Nor did the printing defects on the implant cause any problems. The tested implant showed satisfactory results and was considered to be suitable for implantation. With the case study, we also showed that the new experimental methodology developed for the mechanical examination of subperiosteal implants is suitable for fatigue examinations of implants.

Open Access: Yes

DOI: 10.3233/ATDE240586

The relationship between bank lending and economic factors in the regions of Kazakhstan

Laszlo Vasa Elvira Nurekenova Assel Bekbossinova

Publication Name: Banks and Bank Systems

Publication Date: 2024-01-01

Volume: 19

Issue: 4

Page Range: 1-16

Description:

Understanding the impact of economic factors on bank lending is crucial in Kazakhstan’s modern economy, characterized by volatile inflation and fluctuations in real wages. This paper aims to investigate the link between bank lending and economic factors such as inflation, real wages, and consumer expenditure in a regional context. Data from the Bureau of National Statistics and the National Bank, covering the period from 2012 to 2022, were used to uncover how economic factors influence bank lending. For the analysis, various economic indicators were integrated through normalization and averaging. Analysis reveals significant regional disparities in real wages and consumer expenditures, which impact the demand for bank credit. The results of the correlation matrix showed that both real wages (P-value < 0.001) and inflation (P-value < 0.001) significantly impact bank lending, with an R2 value of 0.998, indicating that the model explains 99.8% of the variation in bank lending. The regression analysis highlights that regions with higher real wages, such as Astana, Almaty, and Atyrau, provide the most favorable conditions for banking sector growth, demonstrated by a strong relationship between wages and bank lending. In contrast, regions with lower wage levels, such as Turkestan and Zhambyl, show a significantly weaker connection (around 0.65), reflecting their lower attractiveness for banking investment and emphasizing the need for policies to address social inequality. The Durbin-Watson test confirmed no autocorrelation in residuals (DW = 1.89), although heteroscedasticity was detected, suggesting the need for further model adjustments. The study emphasizes the importance of developing economic policies that can balance regional development and improve financial stability.

Open Access: Yes

DOI: 10.21511/bbs.19(4).2024.01

Input parameters of transdanubian clay for the hardening soil and soft soil models

Edina Koch

Publication Name: Pollack Periodica

Publication Date: 2009-04-01

Volume: 4

Issue: 1

Page Range: 93-104

Description:

In recent years, finite element modeling has become an important design tool. Advanced programs make it possible to use more complex soil models in addition to standard elasto-plastic models with Mohr-Coulomb failure criteria. These new models can follow nonlinear behavior and complicated loading sequences. The two most promising new models are: the Hardening Soil Model (HS) and the Soft Soil Model (SS). This paper focuses on the behavior of Transdanubian Clay, common in Hungary. Sampling, laboratory testing, and evaluation of data aiming at determining parameters for HS and SS models are described. Results based on oedometer tests using unloading/reloading sequences proved to be adequate for input to these models. © 2009 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.4.2009.1.10

Analysis of wind power generation potential and wind turbine installation economics: A correlation-based approach

Gusztáv Fekete Rohit Khargotra Vibha Yadav Tej Singh Amit Kumar Yadav Ujawal Kumar Adarsh Ranjan Talluru Sai Vinil Kumar

Publication Name: Results in Engineering

Publication Date: 2025-03-01

Volume: 25

Issue: Unknown

Page Range: Unknown

Description:

Wind energy production is rapidly expanding worldwide, yet studies on wind energy potential in India remain limited. This study evaluates the wind power potential and conducts an economic cost analysis of wind turbine generator installations at varying hub heights (10m to 150 m) across 21 locations in India, representing a novel contribution to the field. The selected locations include 11 sites in Gujarat (Location-1), 10 sites in Tamil Nadu (Location-2), and one site in Ravangla, Sikkim (Location-3). Cubic factors methods are implemented to estimate Weibull parameters. Results reveal that at 150 m hub height, wind power density ranges from 123.17 to 308.86 W/m² in Gujarat, 80.64 to 427.12 W/m² in Tamil Nadu, and 183.24 W/m² in Sikkim. Kaluneerkulam in Tamil Nadu demonstrates excellent wind category potential, with energy costs ranging from $0.0165 to $0.0076 per kWh, decreasing as hub height increases. Sites across all three locations exhibit moderate to steady wind speeds, making them suitable for wind energy exploitation. An economic analysis of nine wind turbine types shows that Tamil Nadu achieves the lowest energy cost variation, followed by Gujarat and Sikkim. This study provides valuable insights for optimizing wind energy utilization in India.

Open Access: Yes

DOI: 10.1016/j.rineng.2024.103743

The effective reduction of spurious oscillations in the valve closure event of an internal combustion engine

Daniel Serfozo

Publication Name: Journal of Physics Conference Series

Publication Date: 2026-01-01

Volume: 3190

Issue: 1

Page Range: Unknown

Description:

The accurate numerical solution of contact-impact problems using finite element method is challenging in multiple aspects. The main difficulty is the effective attenuation of spurious oscillations emerging due to the spatial discretization. As these oscillations deteriorate the accuracy, the elimination of spurious components in the numerical results has a great importance. To achieve it, a damping effect must be contained in the applied numerical scheme. Based on the conducted research in this field, the concrete shape of the damping character plays a crucial role in reducing oscillations with the best possible efficacy. The proposed method operates with viscous damping formulated as Caughey damping. Considering concrete industrial problems, represented as a two-dimensional FEM model, the proposed scheme proved to be effective and more accurate compared to several widely applied numerical methods. Due to the simple formulation combined with good oscillations reduction, the newly developed method has a great potential in practical engineering applications.

Open Access: Yes

DOI: 10.1088/1742-6596/3190/1/012004

The role of driver's eye height in the design of crest curves of roads

Dániel Miletics Khalil Khaska

Publication Name: Pollack Periodica

Publication Date: 2023-09-25

Volume: 18

Issue: 3

Page Range: 113-118

Description:

The driver's eye height from the ground, as what drivers can see on the road, is essential for their safety and for avoiding road hazards. Using the statistical analysis of vehicles sample, the statistical parameters of the measured set of values were determined. A one-sample t-test was done to check whether the measured sample differs from the driver's eye height value specified in the Hungarian design guidelines. A new range of driver's eye height has been found, which is considered an update to the current value and might be applied in the upcoming road design. Parallel with the eye-height analysis, sight distances at vertical crest curves were modeled by AutoCAD Civil 3D. The minimum radiuses of the crest curves were defined for human eye height and for sensors of autonomous vehicles.

Open Access: Yes

DOI: 10.1556/606.2023.00808