Pavel Kučera

On vehicle data acquisition system

The goal of this paper is to present a vehicle data acquisition system. This system is a part of the Car Transport Safety project that is aimed at modern methods in the vehicle transportation systems. The goal of the project is to reduce hazardous situations on the roads by analyzing behavior of the driver and identifying the degradation of drivers abilities. The goal of the vehicle data acquisition system is to create a publicly available data archive taken from the operation of a real car under various real conditions of the driver and the road. The data is collected from a vehicles communication bus and from an image acquisition system. Data is processed with the aim to analyze it and reveal changes in a drivers abilities and to eventually alarm the driver or passenger(s).

Performance evaluation of symmetric cryptography in embedded systems

We consider the problem of implementing security algorithms into embedded systems deployed in automation applications. Such systems are typically built on embedded microcontrollers with limited resources and as hardware changes may not be possible or convenient, the software based cryptography is a suitable solution. In this paper we present results of performance benchmarks of different software-implemented symmetric cryptography algorithms on 8 and 16-bit microcontroller platforms. The contribution of the work is in comparing performance of different algorithms, embedded microcontroller platforms, effects of optimizations and different implementations.

On security of PAN wireless systems

This paper describes security features of ZigBee and Bluetooth PAN wireless networks. On examples of those two wireless systems are demonstrated challenges associated with utilization of present wireless systems for applications requiring secure data exchange. Recent penetration of wireless technologies into building and process automation applications even increases the need to fully understand the limitations of the security concepts used.

Simulation of RFieldbus networks

Abstract Driven by the demand on more flexibility in manufacturing and process automation systems. investigations are made in the field of wireless communication. In the R-FlELDBUS project a new wireless physical layer type was added to an existing fieldbus system. The resulting R-FIELDBUS systems allow adaptive architectures with mixed wired and wireless segments. To be able to analyse the functional and time behaviour of different configurations, a simulation model of the fieldbus system was also extended by the wireless behaviour. This paper describes the used simulation method. the models of the communication protocol as well as the new added wireless medium type as well as providing some first simulation results.

Novel method for evaluation of multi-class area under receiver operating characteristic

Two novel methods for computation of multi-class AUC are introduced. Both methods are of lower computational complexity then the current method. Their real time-requirements are different and experimentally proven. The better method is described in detail to make it possible to implement it in any environment or programming language.

Testing of the mechatronic robotic system of the differential lock control on a truck

This article deals with testing the algorithm developed for autonomous control lock of the differential in a truck. Hardware for hardware in the loop testing of robotic systems or automotive systems is used and the proposed control algorithm was implemented into it. The system was applied to a vehicle with 8 × 8 drive and control algorithm evaluates input sensor values to set robotic console control. It is an actuator which consists of electrovalve, pneumatic cylinder, console, special dog clutch and feedback limit switch. This robotic console is used to lock the truck differentials. Verification of the correct algorithm operation was performed by manoeuvres and the response of the whole system was monitored. The aim was to get the reaction times of this mechatronic robotic system and evaluate them.

Measuring the Yaw Moment of Inertia of a Vehicle

Shrnutí Članek popisuje postup určeni momentu setrvačnosti vozidla ke svisle ose. Je navržen měřici stav pro měřeni momentu setrvačnosti založeny na principu fyzikalniho kyvadla a je analyzovan vliv chyby měřeni periody kmitu na celkovou chybu určeni momentu setrvačnosti. V programu Labview je sestaven vypočtovy postup pro přesne určeni periody kmitaveho pohybu z naměřenych dat. Funkčnost celeho měřiciho postupu je ověřena stanovenim přesnosti a opakovatelnosti měřeni. Abstract This article sets out a method for the determination of a vehicle’s yaw moment of inertia. A test rig for moment of inertia measurements based on the physical pendulum principle has been designed and the effect of the oscillation period measurement error on the total measurement error was analysed. The computational procedure for accurate oscillation period determination was developed in the LabVIEW software environment, and the function of the complete measurement procedure was then verified by evaluating the accuracy and precision of the measurements.

Urban vehicle-to-infrastructure wireless communications range evaluation

We consider the problem of information propagation for traffic management applications of Intelligent Transportation Systems in urban areas. In this paper is described a system for measurement of communication range of vehicular wireless communications, method for processing and interpreting the measured data and the initial results. The measurement system is designed to provide an estimate on radio propagation and coverage in vehicular applications in urban areas and the focus is on evaluation of the communication coverage for IEEE 802.11 and IEEE 802.15.4 standards based wireless communication systems. The data collected with the described test system are made available online at http://project-bay.eu/v2x-dataset.

New feature selection method for multi-class data: Iteratively weighted AUC (IWA)

This paper deals with the new filter feature selection method Iteratively Weighted Area under Receiver Operating Characteristic (IWA). It is aimed for the multi-class problems with quantitative inputs. The experiments prove its superior quality in comparison to the equivalent methods.

Protocol gateways for HART sensors

Abstract The paper presents description of three different protocol gateways for interfacing HART pressure sensors. The gateways have been designed, programmed and realized as hardware prototypes. The first gateway is a wireless transducer between the HART interface of the sensor and a Bluetooth network. The second gateway connects the sensor to an Ethernet network with Modbus protocol. The third gateway is a wireless transducer for ZigBee networks. The gateways are based on embedded microcontrollers with the required interfaces. The software implementation is done in C using protocol libraries. Hardware and enclosure are designed for industrial applications. The gateways are adapted for use with HART pressure sensors.