Krzysztof Rzecki

Krzysztof Rzecki
AGH University of Science and Technology in Kraków | AGH · Department of Automatics and Biomedical Engineering

PhD
biometric methods, gesture recognition, machine vision, radiotherapy and cosmic rays

About

57
Publications
10,475
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258
Citations
Introduction
His research focuses on the field of biometric methods, gesture recognition, machine vision, radiotherapy and cosmic rays. Previous projects concerned bronchoscopy, laser-induced breakdown spectroscopy, virtualization, context awareness, service-oriented architecture and network protocols.

Publications

Publications (57)
Article
Full-text available
Background The gamma index and dose–volume histogram (DVH)-based patient-specific quality assurance (QA) measures commonly applied in radiotherapy planning are unable to simultaneously deliver detailed locations and magnitudes of discrepancy between isodoses of planned and delivered dose distributions. By exploiting statistical classification perfo...
Preprint
Full-text available
Both the lack of observation of ultra-high energy (UHE) photons and the limitations of the state-of-the-art methodology being applied for their identification motivate studies on alternative approaches to the relevant simulations and the related observational strategies. One of such new approaches is proposed in this report and it concerns new obse...
Preprint
Full-text available
The search for correlations between secondary cosmic ray detection rates and seismic effects has long been a subject of investigation motivated by the hope of identifying a new precursor type that could feed a global early warning system against earthquakes. Here we show for the first time that the average variation of the cosmic ray detection rate...
Preprint
Full-text available
The last decade has brought about a profound transformation in multimessenger science. Ten years ago, facilities had been built or were under construction that would eventually discover the nature of objects in our universe could be detected through multiple messengers. Nonetheless, multimessenger science was hardly more than a dream. The rewards f...
Article
Full-text available
The Cosmic Ray Extremely Distributed Observatory (CREDO) pursues a global research strategy dedicated to the search for correlated cosmic rays, so-called Cosmic Ray Ensembles (CRE). Its general approach to CRE detection does not involve any a priori considerations, and its search strategy encompasses both spatial and temporal correlations, on diffe...
Article
Propagation of ultra-high energy photons in the solar magnetosphere gives rise to cascades comprising thousands of photons. We study the cascade development using Monte Carlo simulations and find that the photons in the cascades are spatially extended over millions of kilometers on the plane distant from the Sun by 1 AU. We estimate the chance of d...
Preprint
Full-text available
Cosmic Ray Ensembles (CRE) are yet not observed groups of cosmic rays with a common primary interaction vertex or the same parent particle. One of the processes capable of initiating identifiable CRE is an interaction of an ultra-high energy (UHE) photon with the solar magnetic field which results in an electron pair production and the subsequent s...
Article
Full-text available
Reliable tools for artefact rejection and signal classification are a must for cosmic ray detection experiments based on CMOS technology. In this paper, we analyse the fitness of several feature-based statistical classifiers for the classification of particle candidate hits in four categories: spots, tracks, worms and artefacts. We use Zernike mome...
Preprint
Full-text available
The wealth of smartphone data collected by the Cosmic Ray Extremely Distributed Observatory(CREDO) greatly surpasses the capabilities of manual analysis. So, efficient means of rejectingthe non-cosmic-ray noise and identification of signals attributable to extensive air showers arenecessary. To address these problems we discuss a Convolutional Neur...
Article
Full-text available
Purpose: The quality of a measured distribution of dose delivered against its corresponding radiotherapy plan is routinely assessed by gamma index (GI) and dose-volume histogram (DVH) metrics. Any correlation between error detection rates, as based on either of these approaches, while argued, has never been convincingly demonstrated. The dependenc...
Article
Full-text available
Gamification is known to enhance users’ participation in education and research projects that follow the citizen science paradigm. The Cosmic Ray Extremely Distributed Observatory (CREDO) experiment is designed for the large-scale study of various radiation forms that continuously reach the Earth from space, collectively known as cosmic rays. The C...
Preprint
Full-text available
For data given on a nonlinear space, like angles, symmetric positive matrices, the sphere, or the hyperbolic space, there is often enough structure to form a Riemannian manifold. We present the Julia package Manifolds.jl, providing a fast and easy to use library of Riemannian manifolds and Lie groups. We introduce a common interface, available in M...
Article
In the present paper we propose an automated procedure for the detection of bone marrow oedema lesions in patients with axial spondyloarthritis (axSpA). The procedure is based on MRI examination of the sacroiliac joints of 30 patients with confirmed sacroiliitis in the course of axSpA (18 of patients were male, while 12 of patients were female; the...
Article
Different methods of user identification and authentication are widely used in security systems. Touch screen-based methods are very convenient for users and do not require specialized equipment, although commonly used pattern locks alone provide a low level of security. Analysis of biometric features of performed gestures can greatly improve the s...
Article
Full-text available
Classification algorithms require training data initially labelled by classes to build a model and then to be able to classify the new data. The amount and diversity of training data affect the classification quality and usually the larger the training set, the better the accuracy of classification. In many applications only small amounts of traini...
Article
Full-text available
The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) and cosmic-ray ensembles (CRE): groups of at least two CR with a common primary interaction vertex or the same parent particle. The CREDO program embraces testing known CR and CRE scenarios, and prepa...
Article
Full-text available
We present the purpose, long-term development vision, basic design, detection algorithm and preliminary results obtained with the Cosmic Ray Extremely Distributed Observatory (CREDO) Detector mobile application. The CREDO Detector app and related infrastructure are unique in terms of their scale, targeting many form-factors and open-access philosop...
Preprint
Full-text available
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) and cosmic ray ensembles (CRE): groups of a minimum of two CR with a common primary interaction vertex or the same parent particle. The CREDO program embraces testing known CR and CRE scenarios, and p...
Preprint
Full-text available
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) and cosmic ray ensembles (CRE): groups of a minimum of two CR with a common primary interaction vertex or the same parent particle. The CREDO program embraces testing known CR and CRE scenarios, and p...
Preprint
Full-text available
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) and cosmic ray ensembles (CRE): groups of a minimum of two CR with a common primary interaction vertex or the same parent particle. The CREDO program embraces testing known CR and CRE scenarios, and p...
Article
In the study a local approach to setting reference tolerance values for distance to agreement (DTA) component of gamma index is proposed. The reference tolerance values are calculated in simulations, following a dose delivery model presented in a previous work. An analytical model for determining the quantiles of DTA distribution is also proposed a...
Article
Full-text available
Purpose: Assessment of the accuracy of geometric tests of a linac used in external beam therapy is crucial for ensuring precise dose delivery. In this paper, a new simulation-based method for assessing accuracy of such geometric tests is proposed and evaluated on a set of testing procedures. Methods: Linac geometry testing methods used in this s...
Preprint
Full-text available
Muons and other ionizing radiation produced by cosmic rays and radiative decays affect CMOS/CCD sensor. When particles colliding with sensors atoms cause specific kind of noise on images recorded by cameras. We present a concept and preliminary implementation of method for recognizing those events and algorithms for image processing and their class...
Preprint
Full-text available
The search for Cosmic-Ray Ensembles (CRE), groups of correlated cosmic rays that might be distributed over very large areas, even of the size of the planet, requires a globally spread and dense network of detectors, as proposed by the Cosmic-Ray Extremely Distributed Observatory (CREDO) Collaboration. This proposal motivates an effort towards explo...
Preprint
Full-text available
Ultra-high energy photons constitute one of the most important pieces of the astroparticle physics problems. Their observation may provide new insight on several phenomena such as supermassive particle annihilation or the GZK effect. Because of the absence of any significant photon identification by a leading experiments such as the Pierre Auger Ob...
Preprint
Full-text available
Propagation of ultra-high energy photons in the galactic and intergalactic space gives rise to cascades comprising thousands of photons. Using Monte Carlo simulations, we investigate the development of such cascades in the solar magnetosphere, and find that the photons in the cascades are distributed over hundreds of kilometers as they arrive at th...
Preprint
Full-text available
The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a project dedicated to global studies of extremely extended cosmic-ray phenomena, the cosmic-ray ensembles (CRE), beyond the capabilities of existing detectors and observatories. Up to date cosmic-ray research has been focused on detecting single air showers, while the search for ensembles...
Chapter
Person identification based on touch screen gestures is a well-known method of authentication in mobile devices. Usually it is only checked if the user entered the correct pattern. Taking into account other biometric data based on the speed and shape of finger movements can provide higher security while the convenience of this authorisation method...
Chapter
The squirrel-cage induction motors (commonly called just electric motors) are widely used in electromechanical devices. They usually act as a source of mechanical power for different types of industrial machines. There is a natural life cycle of such electric motors ending in malfunction caused by damage of particular electric or mechanical parts....
Chapter
Touch screen gestures are a well-known method of person authentication in mobile devices. In most applications it is, however, reduced to checking if the user entered the correct pattern. Using additional information based on the speed and shape of finger movements can provide higher security without significantly impacting the convenience of this...
Article
Full-text available
Laser-induced breakdown spectroscopy (LIBS) is an important analysis technique with applications in many industrial branches and fields of scientific research. Nowadays, the advantages of LIBS are impaired by the main drawback in the interpretation of obtained spectra and identification of observed spectral lines. This procedure is highly time-cons...
Preprint
Full-text available
Laser-induced breakdown spectroscopy (LIBS) is an important analysis technique with applications in many industrial branches and fields of scientific research. Nowadays, the advantages of LIBS are impaired by the main drawback in the analysis of collected data. This procedure is essentially based on the comparison of lines present in the spectrum w...
Article
Biometrics is based on the analysis of biometric features and is usually used for person recognition. In this article we analyze biometric features related to touch screen gestures. The proposed approach to person identification has a great application potential due to the popularity of mobile devices, so research in this area will be an important...
Article
Full-text available
One of the major procedures for testing the geometrical accuracy of devices used in radiotherapy treatments is the test of the geometrical position of the radiation isocenter. The importance of the test reflects the fact that geometrical position of the radiation isocenter generally affects the tumor targeting. At present the geometric accuracy is...
Conference Paper
Full-text available
The purpose of this article is to discuss the motivation and benefits of developing and releasing a cloud service providing digital signature in software and infrastructure as-a-service model. Additionally, since users authorization and authentication is based on biometry (analyzing the blood vessels system) the end user doesnt have to be equipped...
Article
Full-text available
The man-machine interface is one of the most exciting areas of the contemporary research. To make the manmachine interface as convenient for a human as possible it is desirable that efficient algorithms for recognising body language are developed. The article presents a system for quick and effective recognition of gestures of the hand body languag...
Chapter
Full-text available
Evaluation nets and Petri nets are an easy, readable and functional methods for visualizing states and communication between computer systems using diagrams. They can be considered as similar methods, because they base on bilateral graph and there is token flow. However, they differ in elements, token flow rules, structure, and runtime process. Pet...
Article
Full-text available
The approach of evolutionary games like prisoner’s dilemma, among others, is based on a consistent strategy. We propose an experimentally verified system where cooperation can arise out of two simple factors: mutation and inheritance. This system has a social dilemma property and allows each agent to set its own desired number of participants. Ther...
Article
Full-text available
In the present paper, the case of a database of scientific articles is described. There can be observed the quantitative effects of the increasing strength of cooperation between scholars. It is manifested in time-related features changes of the numbers distribution of a single co-authors’ article. The distribution of the number of co-authors of an...
Article
Full-text available
Computational intelligence methods achieve high efficiency in the analysis of multidimensional data from e-nose, the equivalent of the human sense of smell. The article presents and compares selected and applied to approximations of five concentration levels of phenol algorithms. The measured responses of an array of 18 semiconductor gas sensors fo...
Article
Full-text available
The need for cost optimization in a broad sense constitutes the basis of operation of every enterprise. In the case of IT structure (which is present in almost every field of activity these days), one of the most commonly applied technologies leading to good cost-to-profit adjustment is virtualization. This allows the location of several operationa...
Book
Full-text available
Assuring the security of critical infrastructure (CI) - vital from the point of view of the functioning of the state, society, business, and individual citizens – it is one of the most important challenges rising to face states at this moment. The Kosciuszko Institute's Report represents an analysis of the issues concerning the protection of critic...
Article
Full-text available
The need for cost optimization in a broad sense constitutes the basis of operation of every enterprise. In the case of IT structure, which is present in almost every field of activity these days, one of the most commonly applied technologies leading to good cost-to-profit adjustment is virtualization. It consists in locating several operational sys...
Article
Full-text available
Abstract This paper presents a complex negotiations model that has been adapted to the organisation of the process of the conclusion and execution of a contract between customer (buyer) and bidder (seller), each represented by software agents. Most research on agent-based automated negotiation is focused on models that end their action at the time...
Conference Paper
Full-text available
Petri net modeling has well-known algorithms, so it is easy to develop computer tools to build, edit, and analyse these networks. These tools are designed to be able to add extensions giving additional functionality, such as an extension for evaluation networks.
Conference Paper
Full-text available
The implementation of the concept based on the SOA paradigm appeared to be significant problem associated with the issue of monitoring and visualization of communication between the various elements of the system during the execution of business processes. The monitoring process as a collection of messages (logs) is a technique known and used. Howe...
Chapter
Full-text available
In this paper, we have presented an idea of agent based SOA systems that use different solutions and mechanisms analysed in the multi-agent domain for providing a flexible construction and an execution of the business processes. We are especially focusing on the problem of composition and execution of the complex business processes possessing web s...

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Projects

Projects (3)
Project
The goal of the project is to use the machine learning techniques to associate track morphologies with particle species and to reconstruct the geometrical properties of extensive air showers generated by extraterrestrial cosmic radiation. Particle tracks are obtained from devices working within CREDO infrastructure.
Project
The research aims at identification of various kinds of tea, and approximation of phenol concentration based on signals from the electronic nose and computation intelligence methods.