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Found 6374 publications

Measuring global value chains by input-output tables

Koppány Krisztián Gáspár Tamás

Publication Name: Statisztikai Szemle

Publication Date: 2020-01-01

Volume: 98

Issue: 9

Page Range: 1035-1065

Description:

No description provided

Open Access: Yes

DOI: 10.20311/stat2020.9.hu1035

Comparative Analysis of Following Distances in Different Adaptive Cruise Control Systems at Steady Speeds

Balázs Horváth Dilshad Mohammed

Publication Name: World Electric Vehicle Journal

Publication Date: 2024-03-01

Volume: 15

Issue: 3

Page Range: Unknown

Description:

Adaptive Cruise Control (ACC) systems have emerged as a significant advancement in automotive technology, promising safer and more efficient driving experiences. However, the performance of ACC systems can vary significantly depending on their type and underlying algorithms. This research presents a comprehensive comparative analysis of car-following distances in different types of Adaptive Cruise Control systems. We evaluate and compare three distinct categories of ACC systems using three different commercial vehicles brands. The study involves extensive real-world testing at Zalazone Proving Ground, to assess the performance of these systems under various driving conditions, including driving at multiple speeds and applying different car following scenarios. The study investigates how each ACC system manages the minimum following distances according to the type of ACC sensors in each tested vehicle. Our findings revealed that at low to medium ranges of constant driving speeds, there was an approximate linear increase in the average clearances between the two following vehicles for all applied scenarios, with comparatively shorter clearances obtained by the vision-based ACC system, while unstable measurements with a high level of dispersion for all ACC systems were observed at high range of driving speeds.

Open Access: Yes

DOI: 10.3390/wevj15030116

Applying fuzzy hough transform for identifying honed microgeometrical surfaces

Brigita Sziova Levente Solecki Balázs Sarkadi-Nagy Laszlo T. Koczy Szilvia Nagy

Publication Name: Studies in Computational Intelligence

Publication Date: 2020-01-01

Volume: 819

Issue: Unknown

Page Range: 35-42

Description:

In the measurement of microgeometrical surfaces it is useful if the same location can be found on a surface for two or more different and independent measurements, as in this case not only statistical parameters of the measurements can be compared, but direct differences can be calculated. Honing is a typical surface processing method resulting in pattern consisting of straight valleys crossing at various angles. Honing pattern is of great help to find a special location. The main goal of this article is to find a method that is able to give some characteristic points that can be used for fitting two measured surfaces together. Hough transform is used in finding straight lines in an image or map, thus it could be used for determining crossing points of the honed surface. However, classical Hough transform either finds way too many disturbing lines in the case of a typical honed surface or almost none, depending on the parameter selection. To solve this rapid changing in the number of the resulting lines, we introduced fuzzy Hough transform. If a fuzzified version of the weights of the individual points in the Hough transform is used, the inverse of the transform becomes clearer, resulting in a pattern more suitable for finding the same location on two measured versions of a surface.

Open Access: Yes

DOI: 10.1007/978-3-030-16024-1_5

Real‐time lidar‐based urban road and sidewalk detection for autonomous vehicles

Claudiu Radu Pozna Erno Horváth Miklos Unger

Publication Name: Sensors

Publication Date: 2022-01-01

Volume: 22

Issue: 1

Page Range: Unknown

Description:

Road and sidewalk detection in urban scenarios is a challenging task because of the road imperfections and high sensor data bandwidth. Traditional free space and ground filter algorithms are not sensitive enough for small height differences. Camera‐based or sensor‐fusion solutions are widely used to classify drivable road from sidewalk or pavement. A LIDAR sensor contains all the necessary information from which the feature extraction can be done. Therefore, this paper focuses on LIDAR‐based feature extraction. For road and sidewalk detection, the current paper presents a real‐time (20 Hz+) solution. This solution can also be used for local path planning. Sidewalk edge detection is the combination of three algorithms working parallelly. To validate the result, the de facto standard benchmark dataset, KITTI, was used alongside our measurements. The data and the source code to reproduce the results are shared publicly on our GitHub repository.

Open Access: Yes

DOI: 10.3390/s22010194

Experimental verification of a control system for autonomous navigation

Gábor Rödönyi Péter Korös Dániel Pup Ádám Kisari Benedek Szucs Alexandros Soumelidis József Bokor

Publication Name: IFAC Papersonline

Publication Date: 2020-01-01

Volume: 53

Issue: 2

Page Range: 14273-14278

Description:

A flexible architecture is developed with the purpose of supporting education and research on the field of autonomous vehicles. A pure electric vehicle is equipped with on-board computational units, sensors and actuator interfaces. This paper presents the current status of the control system and its validation by means of navigation experiments. With the cascade control architecture, problems of actuator dead-zone, sensor offset errors, path tracking and redesign for obstacle avoidance are addressed.

Open Access: Yes

DOI: 10.1016/j.ifacol.2020.12.1171

Breaking and making constitutional rules: The constitutional effects of the financial crisis in Hungary

No authors available

Publication Name: Constitutions in the Global Financial Crisis: A Comparative Analysis

Publication Date: 2013-12-01

Volume:

Issue:

Page Range: 245-261

Description:

Open Access: No

DOI: DOI not available

Fuzzy-based multi-stroke character recognizer

No authors available

Publication Name: 2013 Federated Conference on Computer Science and Information Systems, FedCSIS 2013

Publication Date: 2013-12-01

Volume:

Issue:

Page Range: 671-674

Description:

In this paper an extension for multi-stroke character recognition of FUzzy BAsed handwritten character Recognition (FUBAR) algorithm will be presented. First the basic concept of a single-stroke version will be overviewed; in the second part of the paper the new version of the algorithm with multi-stroke symbol support will be introduced, which deploy the same algorithm overviewed in the first part and use flat and hierarchical rule bases. © 2013 Polish Information Processing Society.

Open Access: No

DOI: DOI not available

Doctoral symposium on recent advances in information technology

No authors available

Publication Name: 2013 Federated Conference on Computer Science and Information Systems, FedCSIS 2013

Publication Date: 2013-12-01

Volume:

Issue:

Page Range: 637

Description:

Open Access: No

DOI: DOI not available

A stochastic model for analyzing the interpretability-accuracy trade-off in interpretable fuzzy systems using nested Hyperball structures

No authors available

Publication Name: 8th Conference of the European Society for Fuzzy Logic and Technology, EUSFLAT 2013 - Advances in Intelligent Systems Research

Publication Date: 2013-12-01

Volume: 32

Issue:

Page Range: 72-79

Description:

Our recent work proposed a new meaning preservation approach together with a parameterizable nested hyperball structured search space for interpretable fuzzy systems in order to solve a problem of inconsistency observed in conventional interpretable fuzzy knowledge bases and simultaneously to address the adjustment of the trade-off between interpretability and accuracy. Based on intuitive reasonings and simulation results a conjecture was formulated about favorable trade-off adjustment properties of the proposed method. The aim of the present paper is to construct a mathematical model, in which the conjectured properties can be analyzed and formally verified. Some computational considerations about the interpretation of the resulting knowledge bases are also made. © 2013. The authors -Published by Atlantis Press.

Open Access: No

DOI: DOI not available