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Performance Evaluation of INACT - INDECT Advanced Image Cataloguing Tool
Libor Michalek,Michal Grega,Damian Bryk,Bartlomiej Grabowski
Advances in Electrical and Electronic Engineering , 2012,
Abstract: In this article, we describe the performance evaluation of INACT tool which is developed for cataloguing of high-level and low-level metadata of the evidence material. INACT tool can be used by police forces in the cases of prosecution of such crimes as as possession and distribution of child pornography (CP). In live forensic cases, the time to first hit (time when the first image containing e.g. CP is found) is important, as then further legal actions are justified (such as arrest of the suspect and his hardware). The performance evaluation of first hit was performed on real data with the cooperation of Czech Police, Department of Internet Crime.
Effective interactions in colloid - semipermeable membrane systems
Pawel Bryk
Physics , 2005,
Abstract: We investigate effective interactions between a colloidal particle, immersed in a binary mixture of smaller spheres, and a semipermeable membrane. The colloid is modeled as a big hard sphere and the membrane is represented as an infinitely thin surface which is fully permeable to one of the smaller spheres and impermeable to the other one. Within the framework of the density functional theory we evaluate the depletion potentials, and we consider two different approximate theories - the simple Asakura-Oosawa approximation and the accurate White-Bear version of the fundamental measure theory. The effective potentials are compared with the corresponding potentials for a hard, nonpermeable wall. Using statistical-mechanical sum rules we argue that the contact value of the depletion potential between a colloid and a semipermeable membrane is smaller in magnitude than the potential between a colloid and a hard wall. Explicit calculations confirm that the colloid-semipermeable membrane effective interactions are generally weaker than these near a hard nonpermeable wall. This effect is more pronounced for smaller osmotic pressures. The depletion potential for a colloidal particle inside a semipermeable vesicle is stronger than the potential for the colloidal particle located outside of a vesicle. We find that the asymptotic decay of the depletion potential for the semipermeable membrane is similar to that for the nonpermeable wall and reflects the asymptotics of the total correlation function of the corresponding binary mixture of smaller spheres. Our results demonstrate that the ability of the membrane to change its shape constitutes an important factor in determining the effective interactions between the semipermeable membrane and the colloidal macroparticle.
Wetting in mixtures of colloids and excluded-volume polymers from density functional theory
Pawel Bryk
Physics , 2005, DOI: 10.1063/1.2129261
Abstract: We use a microscopic density functional theory based on Wertheim's first order thermodynamic perturbation theory to study wetting behavior of athermal mixtures of colloids and excluded-volume polymers. In opposition to the wetting behavior of the Asakura-Oosawa-Vrij model we find the polymer-rich phase to wet a hard wall. The wetting transition is of the first order and is accompanied by the prewetting transition. We do not find any hints for the layering transitions in the partial wetting regime. Our results resemble the wetting behavior in athermal polymer solutions. We point out that an accurate, monomer-resolved theory for colloid-polymer mixtures should incorporate the correct scaling behavior in the dilute polymer regime and an accurate description of the reference system.
Density functional theory and demixing of binary hard rod-polymer mixtures
P. Bryk
Physics , 2003, DOI: 10.1103/PhysRevE.68.062501
Abstract: A density functional theory for a mixture of hard rods and polymers modeled as chains built of hard tangent spheres is proposed by combining the functional due to Yu and Wu for the polymer mixtures [J. Chem. Phys. {\bf 117}, 2368 (2002)] with the Schmidt's functional [Phys. Rev. E {\bf 63}, 50201 (2001)] for rod-sphere mixtures. As a simple application of the functional, the demixing transition into polymer-rich and rod-rich phases is examined. When the chain length increases, the phase boundary broadens and the critical packing fraction decreases. The shift of the critical point of a demixing transition is most noticeable for short chains.
Demixing in athermal mixtures of colloids and excluded-volume polymers from a density functional theory
Pawel Bryk
Physics , 2004, DOI: 10.1063/1.1844331
Abstract: We study the structure and interfacial properties of model athermal mixtures of colloids and excluded volume polymers. The colloid particles are modeled as hard spheres whereas the polymer coils are modeled as chains formed from tangentially bonded hard spheres. Within the framework of the nonlocal density functional theory we study the influence of the chain length on the surface tension and the interfacial width. We find that the interfacial tension of the colloid-interacting polymer mixtures increases with the chain length and is significantly smaller than that of the ideal polymers. For certain parameters we find oscillations on the colloid-rich parts of the density profiles of both colloids and polymers with the oscillation period of the order of the colloid diameter. The interfacial width is few colloid diameters wide and also increases with the chain length. We find the interfacial width for the end segments to be larger than that for the middle segments and this effect is more pronounced for longer chains.
Non mean-field behaviour of critical wetting transition for short-range forces
Pawel Bryk,Kurt Binder
Physics , 2013, DOI: 10.1103/PhysRevE.88.030401
Abstract: Critical wetting transition for short-range forces in three dimensions ($d=3$) is reinvestigated by means of Monte Carlo simulation. Using anisotropic finite size scaling approach, as well as approaches that do not rely on finite size scaling, we show that the critical wetting transition shows clear deviation from mean-field behaviour. We estimate that the effective critical exponent $\nu_{\|}^{\textrm{eff}}=1.76\pm 0.08$ for $J/kT=0.35$ and $\nu_{\|}^{\textrm{eff}}=1.85\pm 0.07$ for $J/kT=0.25$. These values are in accord with predictions of Parry {\it et al.} [Phys. Rev. Lett. {\bf 100}, 136105 (2008)]. We also point out that the anisotropic finite size scaling approach in $d=3$ requires additional modification in order to reach full consistency of simulational results.
Short chains at solid surfaces: wetting transition from a density functional approach
P. Bryk,S. Sokolowski
Physics , 2004, DOI: 10.1063/1.1814075
Abstract: A microscopic density functional theory is used to investigate the adsorption of short chains on attractive solid surfaces. We analyze the structure of the adsorbed fluid and investigate how the wetting transition changes with the change of the chain length and with relative strength of the fluid-solid interaction. End segments adsorb preferentially in the first adsorbed layer whereas the concentration of the middle segments is enhanced in the second layer. We observe that the wetting temperature rescaled by the bulk critical temperature decreases with an increase of the chain length. For longer chains this temperature reaches a plateau. For the surface critical temperature an inverse effect is observed, i.e. the surface critical temperature increases with the chain length and then attains a plateau. These findings may serve as a quick estimate of the wetting and surface critical temperatures for fluids of longer chain lengths.
Comment on "Direct evidence for strong crossover of collective excitations and fast sound in the supercritical state"
T. Bryk,I. Mryglod
Physics , 2015,
Abstract: We comment on three incorrect claims in the paper by Fomin et al (arXiv:1507.06094) concerning the generalized hydrodynamic methodology and positive sound dispersion in fluids.
Authority, Power, and Responsibility as Prerequisites of Decision-Making and Manifestation of the Management Style
Oksana Bryk, Мstyslav Kocharovskyi
Psychology and Psychosocial Interventions , DOI: 10.18523/2617-2348.2018.15-19
Abstract: The article presents a theoretical study of the most common and actual theories and approaches to the problem of understanding the correlation between the usage of authority, power, and responsibility in management; their influence on making managerial decisions; and the management style overall. The study suggests that there are various different theories that attempt to explain the nature of leadership, management, and authority. The study differentiates authority and power, with authority being an official right to manage given by the organization hierarchical structure, and power being an unofficial right given by the ability to solve problems. Furthermore, both authority and power come with responsibility, which is a function of control. The study also differentiates management by style. This also leads to differentiation by decision-making approaches: each management style corresponds with a different approach to decision-making. All in all, this article shows how important it is to study the correlation between the usage of authority, power, and responsibility in management in order to be able to choose an appropriate management style to facilitate maximum efficiency and effectiveness of decisions made.
Pretjerivanja : preispitivanje zadataka kustosa
Villa Bryk, Nancy
- , 2003,
Abstract: Hr？ak ID: 14044
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