Piotr Guzik

Piotr Guzik
AGH University of Science and Technology in Kraków | AGH · Department of Telecommunications

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17
Publications
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154
Citations

Publications

Publications (17)
Article
Full-text available
Interstellar comets penetrating through the Solar System had been anticipated for decades1,2. The discovery of asteroidal-looking ‘Oumuamua3,4 was thus a huge surprise and a puzzle. Furthermore, the physical properties of the ‘first scout’ turned out to be impossible to reconcile with Solar System objects4,5,6, challenging our view of interstellar...
Preprint
Full-text available
Interstellar comets penetrating through the Solar System were anticipated for decades. The discovery of non-cometary 1I/'Oumuamua by Pan-STARRS was therefore a huge surprise and puzzle. Furthermore, its physical properties turned out to be impossible to reconcile with Solar System objects, which radically changed our view on interstellar minor bodi...
Article
Full-text available
Models of the Solar System's evolution show that almost all the primitive material leftover from the formation of the planets was ejected to the interstellar space as a result of dynamical instabilities ¹ . Accordingly, minor bodies should also be ejected from other planetary systems and should be abundant in the interstellar space ², giving hope f...
Article
We show that `Oumuamua's excited spin could be in a high energy LAM state, which implies that its shape could be far from the highly elongated shape found in previous studies. CLEAN and ANOVA algorithms are used to analyze `Oumuamua's lightcurve using 818 observations over 29.3~days. Two fundamental periodicities are found at frequencies (2.77$\pm$...
Article
Full-text available
Models of the Solar System evolution show that almost all the primitive material leftover from the formation of the planets was ejected to the interstellar space as a result of dynamical instabilities. Accordingly, minor bodies should also be ejected from other planetary systems and should be abundant in the interstellar space. The number density o...
Conference Paper
The paper presents application of multinomial logistic regression for color segmentation. The common problem in the subject of image understanding is creation of a large enough corpus for algorithm training. Especially when a large set of classes has to be recognized or if using convolutional neural networks the size and diversity of the training s...
Article
Full-text available
The paper discusses business impact analysis in the context of resilient communication networks. It is based on the total (aggregated) penalty that may be paid by an operator when the services (identified with transport demands) provided are interrupted due to network failures. The level of penalty is expressed as a commonly accepted business risk...
Article
Full-text available
Closed circuit television systems (CCTV) are becoming more and more popular and are being deployed in many offices, housing estates and in most public spaces. Monitoring systems have been implemented in many European and American cities. This makes for an enormous load for the CCTV operators, as the number of camera views a single operator can moni...
Article
This article proposes shifting the perspective for the design of resilient networks from cost-focused to one suited for business purposes. Risk engineering is used as a basis to enable us to monetarily express not only the cost of recovery, but also the impact of failures affecting connections (expressed with use of penalties imposed on an operator...
Article
The paper discusses business impact analysis in the context of resilient networks. The emphasis is put on risk evaluation using Value-at-Risk (VaR) and Conditional VaR measures. The concerns known for VaR are shown, especially the theoretical lack of subadditivity. The study shows that in practice the disadvantages do not appear in resilient networ...
Article
Full-text available
Automatic eye localisation is a crucial part of many computer vision algorithms for processing face images. Some of the existing algorithms can be very accurate unfortunately at the cost of computational complexity. In this paper the new solution to the problem of automatic eye localisation is proposed. Eye localisation is posed as a nonlinear regr...
Article
Full-text available
In this paper we present real data bit error rate (BER) performance evaluation of the recently proposed correlation-and-bit-aware improved spread spectrum (CAISS) watermarking scheme (Valizadeh and Wang, IEEE Trans Inf Forensics Secur 6(2):267–282, 2011). Our tests were performed in discrete cosine transform (DCT) domain. The results show significa...
Conference Paper
The problem of optimizing classifiers for object detection has already been discussed in several publications. In order to achieve better results, it was decided to use genetic algorithms to optimize the classifiers. By applying this approach optimization is automatic in respect to image (or group of images). For test issues the haar-like object de...
Article
IAUC 8249 available at Central Bureau for Astronomical Telegrams.
Article
IAUC 8239 available at Central Bureau for Astronomical Telegrams.

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