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Found 6334 publications

Backflipping With Miniature Quadcopters by Gaussian-Process-Based Control and Planning

R. Tóth Tamás Péni Peter Antal

Publication Name: IEEE Transactions on Control Systems Technology

Publication Date: 2024-01-01

Volume: 32

Issue: 1

Page Range: 3-14

Description:

This article proposes two control methods for performing a backflip maneuver with miniature quadcopters. First, an existing feedforward control approach is improved by finding the optimal sequence of motion primitives via Bayesian optimization, using a surrogate Gaussian process (GP) model. To evaluate the cost function, the flip maneuver is performed repeatedly in a simulation environment. The second method is based on closed-loop control and it consists of two main steps: first, a novel robust, adaptive controller is designed to provide reliable reference tracking even in case of model uncertainties. The controller is constructed by augmenting the nominal model of the drone with a GP that is trained using measurement data. Second, an efficient trajectory planning algorithm is proposed, which designs feasible trajectories for the flip maneuver using only quadratic programming. The two approaches are analyzed in simulations and in real experiments using Bitcraze Crazyflie 2.1 quadcopters.

Open Access: Yes

DOI: 10.1109/TCST.2023.3297744

The role and function of symbolic legislative acts in Hungarian legal system(s)

Katalin Egresi

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 113-124

Description:

Symbolic legislation in critical sociological theories refers to cases that are largely ineffective and serve political and social goals other than the officially proclaimed ones. A well-known example is the theory of Vilhelm Aubert. According to Aubert, this legislation was never intended to be effective. Since the 1990s, another concept of symbolic legislation has developed. Particularly in the theory of Dutch legislation, the symbolic legislation is an alternative legislative technique that differs from the traditional top-down approach. The main aim of the article is to synthesize the competing theoretical approaches through some examples of the Hungarian legal system.

Open Access: Yes

DOI: DOI not available

Local Motion Planning for Overtaking Maneuvers in a Rural Road Environment

Szilárd Aradi Árpád Fehér Dániel Losonczi László Palkovics

Publication Name: Proceedings of the International Conference on Informatics in Control Automation and Robotics

Publication Date: 2024-01-01

Volume: 2

Issue: Unknown

Page Range: 220-227

Description:

This paper introduces an application of local motion planning designed explicitly for overtaking maneuvers in a rural road environment. The approach integrates multiple driving strategies for enhanced passenger comfort, including the fastest path and minimum jerk trajectory. A robust trajectory planner technique is developed using the Frenet frame, effectively considering real traffic situations, curves, and moving obstacles. Comprehensive analyses are performed on vehicle dynamics, individual cost function components, and planning and tracing times to assess the performance and computational efficiency of the proposed methods. The simulation results highlight the approach’s strengths in maintaining dynamic feasibility, ensuring safety, and enhancing passenger comfort while identifying areas for potential improvements, such as computational overhead in complex scenarios.

Open Access: Yes

DOI: 10.5220/0013001600003822

Statistical and fuzzy signature-based analysis of the aggressive attitudes of a forensic population

Dalia Susniene Daiva Žostautienė Ojaras Purvinis Ĺaszĺo T. Ḱoczy

Publication Name: Journal of Infrastructure Policy and Development

Publication Date: 2024-01-01

Volume: 8

Issue: 8

Page Range: Unknown

Description:

Clustering technics, like k-means and its extended version, fuzzy c-means clustering (FCM) are useful tools for identifying typical behaviours based on various attitudes and responses to well-formulated questionnaires, such as among forensic populations. As more or less standard questionnaires for analyzing aggressive attitudes do exist in the literature, the application of these clustering methods seems to be rather straightforward. Especially, fuzzy clustering may lead to new recognitions, as human behaviour and communication are full of uncertainties, which often do not have a probabilistic nature. In this paper, the cluster analysis of a closed forensic (inmate) population will be presented. The goal of this study was by applying fuzzy c-means clustering to facilitate the wider possibilities of analysis of aggressive behaviour which is treated as a heterogeneous construct resulting in two main phenotypes, premeditated and impulsive aggression. Understanding motives of aggression helps reconstruct possible events, sequences of events and scenarios related to a certain crime, and ultimately, to prevent further crimes from happening.

Open Access: Yes

DOI: 10.24294/jipd.v8i8.5727

EVALUATION OF PEDESTRIANS' GAZE BEHAVIOR WHEN CROSSING THE ROAD USING EYE-TRACKING TECHNOLOGY: IMPLICATIONS FOR AUTONOMOUS VEHICLE LED COMMUNICATION INTERFACE

Emese Makó Symbat Zhanguzhinova

Publication Name: Communications Scientific Letters of the University of Zilina

Publication Date: 2024-01-01

Volume: 26

Issue: 4

Page Range: D62-D70

Description:

Since autonomous vehicles (AV) are in the testing process, it is an open question of how pedestrians will communicate with self-driving cars. Nowadays, explicit communication pattern is the main way of pedestrian-driver interaction, however, AV may use implicit communication when making crossing decisions. This study aims to analyze pedestrians’ gaze behavior when crossing the road using an eye camera and find the most applicable location for the LED interface on AVs. 10 pedestrian crossings in Gyor, Hungary were analyzed using the synchronized eye-tracking (ET) technology and regular video cameras for combined data processing. The data were analyzed using digital image processing techniques and statistical methods to identify where pedestrians looked and whether a pedestrian-driver interaction was captured during the crossing maneuver.

Open Access: Yes

DOI: 10.26552/com.C.2024.044

The Construction and Application of the Economy-Electricity-Emissions Input-Output (IO-E3) Table for Hungary

Koppány Krisztián

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 733-738

Description:

This paper presents the steps and methods of producing the IO-E3 Economy-Electricity-Emissions input-output table for Hungary, which contains 28 industries, 8 sub-industries of electric power plants, and 5 final demand categories. Simulations performed with the model show that the ongoing 120 % expansion of nuclear capacity can result in a 55.2 %, 35.1 %, and 30.1 % increase in electricity production, value-added, and greenhouse gas emissions if the structure of final demand and technology are not changed. Smart use of the predicted 17.48 TWh of electricity surplus, however, must precisely aim these changes to best serve Hungary's sustainability transition through harnessing technological developments and by changing economic structures.

Open Access: Yes

DOI: 10.3303/CET24114123

East-to-west dispersal of bird-associated ixodid ticks in the northern Palaearctic: Review of already reported tick species according to longitudinal migratory avian hosts and first evidence on the genetic connectedness of Ixodes apronophorus between Siberia and Europe

Jenő Kontschán Attila D. Sándor Vojtěch Brlík Gergő Keve Denis Fedorov Andor Pitó Nóra Takács Sándor Hornok

Publication Name: Current Research in Parasitology and Vector Borne Diseases

Publication Date: 2024-01-01

Volume: 6

Issue: Unknown

Page Range: Unknown

Description:

Birds are long-known as important disseminators of ixodid ticks, in which context mostly their latitudinal, south-to-north migration is considered. However, several bird species that occur in the eastern part of the northern Palaearctic are known to migrate westward. In this study, a female tick collected from the sedge warbler, Acrocephalus schoenobaenus, in Lithuania was identified morphologically and analyzed with molecular-phylogenetic methods. In addition, literature data were reviewed on ixodid tick species known to be associated with birds that have recorded east-to-west migratory route in the Palaearctic. The tick collected from A. schoenobaenus was morphologically identified as Ixodes apronophorus. Two mitochondrial genetic markers for this specimen showed 100% identity with a conspecific tick reported previously in Western Siberia, Russia. Based on literature data, as many as 82 bird species from 11 orders were found to have records of ringing in the easternmost part of the northern Palaearctic and recaptures in Europe. Of these bird species, 31 ixodid tick species were reported in the Euro-Siberian region. Nearly all passeriform bird species with east-to-west migration were reported to carry ticks, whereas no reports of tick infestation were documented from the majority of wetland-associated bird species, mostly from the orders Anseriformes and Charadriiformes. The first European sequences of bona fide I. apronophorus revealed genetic connectedness with conspecific ticks reported from Siberia. Since the principal hosts of this tick species are rodents which do not migrate large distances, the most likely explanation for genetic similarity in this direction is dispersal of this tick species via migratory birds. Given the high number of tick species that are known to associate with bird species migrating in westward direction, this appears to be an important means of the gene flow between geographically distant tick populations in the northern Palaearctic.

Open Access: Yes

DOI: 10.1016/j.crpvbd.2024.100201

EXPLORING THE TOURIST ATTRACTIVENESS OF CULTURAL SITES: THE CASE OF KAZAKHSTAN

Lóránt Dávid Aza Yevloyeva Dinara Kadyrbekova Bakyt Aktymbayeva Yerlan Issakov Albina Beikitova Yerkegul Dyussekeyeva Adil Moldagaliyev

Publication Name: Geojournal of Tourism and Geosites

Publication Date: 2024-01-01

Volume: 56

Issue: 4

Page Range: 1627-1636

Description:

The article examines the components contributing to the tourist appeal of cultural sites in the Republic of Kazakhstan, exploring the intricate relationship between their attractiveness and cultural significance. This is vital for promoting sustainable tourism, fostering cultural exchange, and preserving shared cultural heritage for future generations. Understanding what makes a place attractive to tourists is crucial for destination marketing, sustainable tourism planning, and revenue generation. The study was conducted in the context of the search for ways to popularize cultural heritage in domestic tourism. Fifteen distinct variables were identified to delineate the allure of these sites, encompassing criteria such as historical significance, aesthetic and architectural value, integration of a cultural object with the natural landscape and environment, involvement of the local community in the promotion and preservation of cultural heritage, among others. A comprehensive questionnaire was devised based on these variables, serving as the foundation for a survey where participants rated the significance of each variable on a 5-point scale. The survey garnered responses from 1,728 residents spanning all regions of Kazakhstan. Through correlation analysis, the acquired ratings were scrutinized, unveiling interconnections among variables and elucidating the primary factors shaping the attractiveness of cultural sites, namely safety and security at the site, the historical significance, accessibility for people with special needs, aesthetic and architectural value, as well as the availability of amenities such as restrooms, information centers, and guided tours.

Open Access: Yes

DOI: 10.30892/gtg.56419-1333

How Perceptual Variables Influence the Behavioral Intention to Use Autonomous Vehicles †

Boglárka Eisingerné Balassa Dániel Csikor Réka Koteczki

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

The rapid development of technology makes the acceptance of autonomous vehicles (AVs) in modern transport a key issue. The aim of the present research was to explore the impact of AVs on behavioral intention to use. An online survey was conducted, in which factors such as perceived usefulness (PU), perceived ease of use (PEU), perceived trust (PT), social influence (SI), and behavioral intention to use (BIU) were investigated. As a result of the investigation, the correlation analysis revealed that there was a significant positive relationship between the intention and all the factors examined. The practical utility of this research is that the results will support developers and vehicle manufacturers in understanding how different social factors influence the adoption of AVs.

Open Access: Yes

DOI: 10.3390/engproc2024079023