Vaclav Krivanek

Dr. Vaclav Krivanek

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 June 2021 in Applied Sciences
Verified
Journal Article
Open access
PDF file
ASAlexandr Stefek
Alexandr Stefek
VPVAN THUAN PHAM
VAN THUAN PHAM
VKVaclav Krivanek
Vaclav Krivanek
LPLAM KHAC PHAM
LAM KHAC PHAM
The energy-efficient motion control of a mobile robot fueled by batteries is an especially important and difficult problem, which needs to be continually addressed in order to prolong the robot’s independent operation time. Thus, in this article, a full optimization process for a fuzzy logic controller (FLC) is proposed. The optimization process employs a genetic algorithm (GA) to minimize the energy consumption of a differential drive wheeled mobile robot (DDWMR) and still ensure its other performances of the motion control. The earlier approaches mainly focused on energy reduction by planning the shortest path whereas this approach aims to optimize the controller for minimizing acceleration of the robot during point-to-point movement and thus minimize the energy consumption. The proposed optimized controller is based on fuzzy logic systems. At first, an FLC has been designed based on the experiment and as well as an experience to navigate the DDWMR to a known destination by following the given path. Next, a full optimization process by using the GA is operated to automatically generate the best parameters of all membership functions for the FLC. To evaluate its effectiveness, a set of other well-known controllers have been implemented in Google Colab® and Jupyter platforms in Python language to compare them with each other. The simulation results have shown that about 110% reduction of the energy consumption was achieved using the proposed method compared to the best of six alternative controllers. Also, this simulation program has been published as an open-source code for all readers who want to continue in the research.

13 November 2018 in Journal of Communications and Networks
Verified
Journal Article
Closed access
VSVadim Starý
Vadim Starý
VKVaclav Krivanek
Vaclav Krivanek
ASAlexandr Stefek
Alexandr Stefek
This article describes the potential application of missile guidance systems used in surface-to-air (S/A) missiles for landing unmanned aerial vehicles (UAV) in the mini rotary wing category. For these modification purposes the line of sight laser beam riding (LOSLBR) system is currently being considered. To allow for UAV tracking from a ground-based tracking and guidance station (GBTGS), an optoelectronic automated tracking system that operates in the visible spectrum of light has been designed. Likewise, the parameters and capacity limits of the individual parts of these aspects are defined and verified, depending on the type of the flying object being observed and guided. In terms of monitoring, the optical path transmission parameters such as the type of optical sensor, lens parameters, throughput and speed of the interface, type of compression, and attributes of the machine vision algorithms are investigated.

1 May 2017
Verified
Conference Paper
Closed access
PKPatrik Kutilek
Patrik Kutilek
PVPetr Volf
Petr Volf
SVSlavka Viteckova
Slavka Viteckova
PSPavel Smrcka
Pavel Smrcka
VKVaclav Krivanek
Vaclav Krivanek
ASAlexandr Stefek
Alexandr Stefek
From the second half of the 1990s, thanks to more affordable and more powerful technology and systems for recording based on miniaturized sensors, we can observe a more intensive development of a system that monitors the physical and psychological conditions of soldiers. Systems for measuring of physical and medical data for the diagnostics of physical and psychological state has significantly spread. This study, however, examines the current technologies and usage of the wearable monitoring systems in military. The article can serve as a guide for choosing suitable and affordable systems of quantitative evaluation of physical and psychological conditions of soldiers. In addition, the innovative telemetry monitoring system (FlexiGuard system) composed of appropriate sensors is introduced. Based on previous researches and tests, FlexiGuard system and its sensors are recommended for use in military practice.

29 December 2017 in Advances in Military Technology
Verified
Journal Article
Open access
PKP. Kutilek
P. Kutilek
PVP. Volf
P. Volf
SVS. Viteckova
S. Viteckova
PSP. Smrcka
P. Smrcka
Lenka LhotskaLenka Lhotska
Lenka Lhotska
ASA. Stefek
A. Stefek

1 May 2015
Verified
Conference Paper
Closed access
YBYves Bergeon
Yves Bergeon
IHImed Hadda
Imed Hadda
VKVaclav Krivanek
Vaclav Krivanek
JMJean Motsch
Jean Motsch
ASAlexandr Stefek
Alexandr Stefek
This article focuses on the ability to use a robot with a low cost 3D Scanner (Kinect) in an indoor environment to do a mapping of different rooms in a building and to be able to localize itself when going back to the same room. This method uses SIFT points (points of interest in images) to be able to reconstruct the environment in 3D and uses these SIFT points to identify the localization of the robot.

1 May 2017
Verified
Conference Paper
Closed access
MBMinh Tuan Bui
Minh Tuan Bui
RDRadek Doskocil
Radek Doskocil
VKVaclav Krivanek
Vaclav Krivanek
THThi Hien Ha
Thi Hien Ha
YBYves T. Bergeon
Yves T. Bergeon
PKPatrik Kutilek
Patrik Kutilek
In this paper, we proposed an indirect method to measure the distance of an object accurately by single visual cameras using triangulation. The object can be seen as the third point of a triangle with two known sides and one known angle. Distance to object can be determined indirectly on the base of known sides and angle, rather than being measured directly. It would be very useful in case there is no line of sight to object (inaccessible) or an obstacle interrupts it. Furthermore, the results show that the measured distance using the indirect method has a less measurement error than the one using the direct method. This method establishes a basis for the implementation of the position algorithm into the navigation subsystem of swarm robots and will be very helpful especially in robot cooperation.