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Found 6278 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

Adaptive Speed Tuning of Permanent Magnet Synchronous Motors Using Intelligent Fuzzy Based Controllers for Pumping Applications

Mohamed I. Abdelwanis Faisal Albatati Ragab A. El-Sehiemy Abdelkarim Hegab

Publication Name: Processes

Publication Date: 2025-05-01

Volume: 13

Issue: 5

Page Range: Unknown

Description:

This study focuses on enhancing the performance of Permanent Magnet Synchronous Motors (PMSMs) in pumping applications by improving motor torque through the integration of advanced control strategies. The dq-axis model of a PMSM is utilized to facilitate precise control and dynamic response. The proposed approach combines Fuzzy Logic Control (FLC) and Fuzzy Proportional-Integral-Derivative (fuzzy PID) controllers with Vector Control (VC) inverters, specifically designed for PMSMs with salient rotor structures. The salient rotor design inherently provides higher torque density, making it suitable for demanding applications like pumping. The FLC and fuzzy PID controllers are employed to optimize the motor’s dynamic response, ensuring precise torque control and improved efficiency under varying load conditions. The VC inverter further enhances the system’s performance by enabling rapid torque and flux control, reducing torque ripple, and improving overall motor stability. The simulation results demonstrate that the proposed control strategy significantly increases motor torque, enhances energy efficiency, and reduces operational losses in pumping applications. This makes the system more reliable and cost-effective for industrial and agricultural pumping systems, where high torque and energy savings are critical. The integration of FLC, fuzzy PID, and VC with a salient-rotor PMSM offers a robust solution for achieving superior motor performance in real-world pumping scenarios. This work contributes to the development of smarter, more efficient pumping systems, paving the way for enhanced industrial automation and energy management.

Open Access: Yes

DOI: 10.3390/pr13051393

The Economic and Educational Imprints of Digital Transformation - Or the Evolution of Digitalisation

Beata Orosz Gyorgy Molnar

Publication Name: Iccc 2022 IEEE 10th Jubilee International Conference on Computational Cybernetics and Cyber Medical Systems Proceedings

Publication Date: 2022-01-01

Volume: Unknown

Issue: Unknown

Page Range: 293-298

Description:

As a major global process, digitalisation is a leading part of almost all aspects of our daily lives. Its impact is clearly felt in the social, economic, and educational sphere and our lifestyle as well. Our traditional world is increasingly converted into digital dimensions, where the process of knowledge acquisition can be significantly accelerated if we can harness the positive aspects of digitalisation. In order to understand how digitalisation can have such a profound impact on our daily lives and transform our world, it is important to briefly describe the main stages of development, the different interpretations of Industry 4.0, Industry 4.5 and digitalisation, and then illustrate the current situation with social and economic examples. We will also point out some important digitalisation-related metrics, referring to the importance of digital competences.

Open Access: Yes

DOI: 10.1109/ICCC202255925.2022.9922775

Effects of Wheel Surface Defects on Ground Borne Vibration

Szabolcs Fischer Farshad Astaraki Majid Movahedi Rad Milad Kazemian Milad Akbarivarmaziar Ahmad Mohammadi Doost

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2022-01-01

Volume: 19

Issue: 6

Page Range: 129-141

Description:

Wheel ground borne vibrations, may have a significant impact on human activity and on nearby buildings. In metropolitan cities, metro lines and their development may cause such vibrations. Despite many works and solutions for path and receiver, the excitation source could also have a great effect. Wheel and rail damages are the two sources of vibration which can increase the damage impact by a factor of 5x. Wheel damage would increase dynamic vertical force noticeably and an increase in ground-borne vibration is expected. In this study with the help of finite element modelling, wheel damage including wheel flat, spalling and wheel oval is studied for a slab track and results are discussed. The studied parameters are velocity and wheel damage and their effect on ground-borne vibrations are examined.

Open Access: Yes

DOI: DOI not available

Maximizing the Capacity Utilization of Selective Waste Collection Vehicles

István Lakatos Ádám Titrik

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2022-01-01

Volume: 19

Issue: 7

Page Range: 165-176

Description:

Selective Waste Collection is an essential part of recycling raw materials, in order to protect our environment. The waste collection is carried out by using a seriously polluting vehicle, due to the fact that most of the gathering vehicles are using fossil energy sources, like gasoline. High volume of carcinogenic elements are contained in the emitted exhaust gases. The current waste collection methods are just focusing on the load of the selective waste collective vehicle during a collection route. The goal of this research is to find the best solution to use the full storage capacity of the selective waste collecting vehicle with the lowest volume of residual air due to the effectively compressed waste. The closed and uncompressed PET bottles require the largest volume in the waste collecting vehicle. It is essential to minimize the air in the PET bottles to decrease the volume. Different methods have been examined to increase the density of the selectively collected waste. Statistical data have been used to determine the collecting parameters – nowadays, a 15 t waste collecting vehicle, with a 20 m3 load capacity is only gathering 1-1.5 t PET due to the ineffective use of its load compartment. The application of the method herein, enhances the efficiency of the waste collecting vehicle by gathering 4-10 times more waste than currently used methods.

Open Access: Yes

DOI: 10.12700/APH.19.7.2022.7.9

Does Mineral Resources Utilization and Governance Policy Induce Income Inequality: Contextual Findings from Historical Data of China

Laszlo Vasa Chen Wang Xiaoyi Ren

Publication Name: Politicka Ekonomie

Publication Date: 2025-01-01

Volume: 73

Issue: 5

Page Range: 891-925

Description:

In the current literature strand, most of the literature is devoted to the role played by mineral and governance policies in environmental quality. However, their criticality in income inequality is mainly overlooked by scholarly works. This research investigated the nexus of mineral and governance policies with income inequality while exploring the importance of per capita income, health expenditure, and poverty. Covering the extended period from 1984Q1 to 20223Q4 in the case of China, this research confirms the presence of long-run equilibrium association between variables. Due to the non-normal data distribution, this research uses quantile regression and a series of robust non-parametric and parametric approaches. The research concludes that mineral resources, health expenditure, governance efficiency, regulatory quality, and poverty headcounts significantly reduce income inequality. Wealth from mineral and health expenditures substantially improves the living standards of the general public. The governance policies are also beneficial in equal wealth distribution of the country. On the contrary, per capita income and government stability are the region’s leading factors of income inequality. Based on the predicted results, this research recommends improved minerals management, strengthening of governance institutions and policies, and enhancement in health expenditure to tackle the issue of income inequality.

Open Access: Yes

DOI: 10.18267/j.polek.1463

GDP per capita and human capital investment in five countries after exhaustion of the first demographic dividend

Izabella Kuncz Petra Németh Eszter Szabó-Bakos Sándor Remsei Éva Berde

Publication Name: Regional Statistics

Publication Date: 2025-01-01

Volume: 15

Issue: 5

Page Range: 908-929

Description:

As total fertility rates (TFRs) decline globally and life expectancy rises, population aging presents significant economic challenges, including a shrinking working-age population and slower economic growth. This paper examines the impact of aging on economic growth trajectories in China, Hungary, Italy, Sweden, and the Republic of Korea, exploring how differing aging patterns influence economic outcomes. Using a general equilibrium model where agents optimize over an infinite horizon, the study projects GDP per capita and per worker over 60 years. The selected countries, each with TFRs below the replacement level for over three decades, are grouped based on demographic aging indicators. GDP trajectories are shaped by the ratios of the older and young populations to the workingage group and changes in workforce size. Human capital investment is a key component of the model, as each child, while they are young, receives human capital investment every year. This investment determines their future productivity in the workforce and, consequently, the productivity of the overall economy. To our knowledge, no prior research has examined human capital investments across multiple periods in models with infinitely optimizing agents and their cumulative impact on economic productivity. The findings suggest that aging trajectories significantly shape economic growth paths, underscoring the need for tailored strategies to sustain growth in different demographic contexts.

Open Access: Yes

DOI: 10.15196/RS150504

Examination of welded joint of titanium alloy used in oral surgery

K. Kulcsár J. Kónya H. Hargitai

Publication Name: Iop Conference Series Materials Science and Engineering

Publication Date: 2020-08-25

Volume: 903

Issue: 1

Page Range: Unknown

Description:

The additive manufacturing of customized Ti-6Al-4V (Grade 23) implants, which in the present research concerns the dental and maxillofacial surgical field, may require complex manufacturing technology due to their complexity and assembly. In practice, additively manufactured titanium implant elements are supplemented by threaded sleeves that allow disassembly. These turned elements made from Grade 5 material quality rolled preform are joined by laser micro-welding with Grade 1 material. This special process for implant production is still not widespread in current manufacturing practice, and there is no technical recommendation for the manufacturing parameters of these implants. The aim of our research is to explore the possibilities and limitations of additive process in the manufacture of custom-made implants and to provide guidelines for optimal manufacturing and welding parameters. In the initial phase of the research, preliminary experiments were conducted with the conventional and additive manufacturing of cylindrical test specimens and with the production of combined products by micro-welding. The specimens were subjected to tensile testing, the weld was examined by CT, and the fracture surfaces were studied by optical microscope and scanning electron microscope.

Open Access: Yes

DOI: 10.1088/1757-899X/903/1/012016

Urbanization, Industrialization, and Energy Transition: An Empirical Analysis of Life Expectancy in a Developing Economy

Pasquale Marcello Falcone Md Hasanur Rahman Fariha Akter Lucky Syeda Sajia Afroz Rumpa

Publication Name: Sustainable Development

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Urbanization is a defining feature of contemporary development, shaping economic opportunities, social structures, and health outcomes. This study examines the influence of urbanization on life expectancy in Bangladesh, with particular attention to the role of the energy mix and industrialization. Using annual data from 1971 to 2024 and applying the Autoregressive Distributed Lag (ARDL) model based on results of the unit root test, where some variables are stationary at level I(0) and some are at first difference I(1), the analysis explores both short- and long-run dynamics. The results indicate that a 1% increase in urbanization raises life expectancy by 0.09% in the short run. Moreover, non-renewable energy consumption and industrialization are found to exert a positive impact on life expectancy due to extensive contribution to national development, where industrialization depends on energy consumption and industrialization leads the economic development in Bangladesh. On the other hand, renewable energy has failed to raise life expectancy due to lack of renewable energy access in Bangladesh. In addition, in the long run, urbanization has a positive impact, where a 1% increase of urbanization leads to raise life expectancy 0.10%. By linking urbanization, energy use, and industrial development, this research addresses a gap in the literature regarding their combined effect on human longevity in developing contexts. The study's findings have suggested policy implications for developing countries to improve urban residents' life expectancy by considering the aim of sustainable development goals (SDGs) 3, 7, and 11.

Open Access: Yes

DOI: 10.1002/sd.70825