Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 111 matches for " Bozena Kostek "
All listed articles are free for downloading (OA Articles)
Page 1 /111
Display every page Item
Waveguide model of the hearing aid earmold system
Grzegorz Szwoch, Bozena Kostek
Diagnostic Pathology , 2006, DOI: 10.1186/1746-1596-1-6
Abstract: In this paper, a computer model adequate for this task is proposed. This model is based on the waveguide modeling method. The waveguide model simulates the propagation of sound waves in the system of cylindrical tubes. Frequency response of the hearing aid receiver is simulated in the model and the influence of the ear canal and the eardrum on the earmold system is taken into account. The model parameters are easily calculated from parameters of a physical hearing aid system. Transfer function of the model is calculated and frequency response plots are obtained using the Matlab system.The frequency response plots of the earmold model were compared to the measurement plots of the corresponding physical earmold systems. The same changes in frequency responses caused by modification of length or diameter of a selected waveguide section, are observed in both measurement data of a real earmold system and in computed model responses.Comparison of model responses obtained for various sets of parameters with measurement data proved that the proposed model accurately simulates the real earmold system and the developed model may be used to construct a computer system assisting the physician who performs earmold system fitting.The number of hearing impaired individuals who need to use hearing aids is rapidly increasing nowadays. Proper tools for optimum hearing aid fitting are needed, allowing physician to choose and tune hearing aid most suitable to the user's needs in a short time. Methods for selecting amplification and compression characteristics in order to compensate hearing loss and improve speech intelligibility are now well developed. However, one aspect of the fitting process that is often underestimated is the design of the earmold system of a hearing aid. In the case of the miniaturized hearing aids (In-The-Ear and In-The-Canal) this problem is of less importance, because the earmold system is very simplified and it does not significantly affect sound quality. Howe
Bartosz Kunka,,Bozena Kostek
International Journal of Computer Science & Applications , 2010,
Automatic assessment of the motor state of the Parkinson's disease patient--a case study
Bozena Kostek, Katarzyna Kaszuba, Pawel Zwan, Piotr Robowski, Jaroslaw Slawek
Diagnostic Pathology , 2012, DOI: 10.1186/1746-1596-7-18
Abstract: The virtual slide(s) for this article can be found here:http://www.diagnosticpathology.diagnomx.eu/vs/1563339375633634 webcite.The Parkinson's Disease is one of many neurodegenerative diseases which slowly degenerates the central nervous system. It results from lack of dopamine in brain cells, and most often manifests itself in motor complications. The causes of such disorders have not fully been recognized yet. Thus, medical treatment of PD patients is limited to reducing the disease symptoms. The progress of the disease is slow and may take several years. In its early stage, the illness is hard to recognize, however, when diagnosed it must be effectively treated to reduce its further development. Main PD symptoms are motor complications such as bradykinesia, muscle rigidity, freezing of gait, tremor [1], difficulties in swallowing, slow down or lack of facial expression and animation, etc. Beside causing motor disorders, PD may also impair concentration and daily routines planning.Detecting the changes in PD patients state within short time is very difficult, in particular, because fully objective tests for evaluating the disease advancement have not been devised so far. One of the widely used methods to assess PD patients is conducting a series of normalized clinic tests known as the UPDRS--Unified Parkinson's Disease Rating Scale) [2,3], which is a list of 42 items with numbers assigned from a 0-4 range. The list is divided into 4 parts [2,3]. However, a subjective character of these tests introduces some error to their results.Taken every three month or half a year, periodical UPDRS tests allow for the evaluation of the advancement of the disease. Such examination requires regular visits to specialists, and unfortunately this is often impossible to fulfill for PD patients for organizational reasons, for no access to specialists or simply because of deteriorating motor abilities. Other obstacles are problems with specifying the precise time of medications intake
Poverty in Poland and the United States: A Comparison of Key Characteristics, Composition, and Prospects  [PDF]
Bozena Leven
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.75057
Abstract: This study provides a comparative approach to assess the state of Polish poverty. To do so, poverty in Poland and the United States is presented in terms of selected general, shared characteristics and particularly vulnerable societal groups. Using official, primarily income based, statistics for Poland and the United States, we conclude that a higher percentage of the overall population in the United States is poor and, relative to median country-specific incomes, that the US poverty is deeper than in Poland. In addition, more children, the elderly, and the disabled are poor in America than in Poland; the breadth of poverty is wider in the United States and, perhaps most importantly, may in some important ways also be more intractable.
Embracing Empowerment in the Healthcare of the United States  [PDF]
Bozena Padykula, Karen Wexell
Open Journal of Leadership (OJL) , 2013, DOI: 10.4236/ojl.2013.24013

The United States experiences an economic and healthcare crisis that calls for change. Transformational leadership model by Kouzes and Posner (2003) defines traits that are important to embrace by today’s healthcare leaders in promoting organizational change. To promote growth, engaging and empowering all members in the organization opens the door for collaborative work intentionally establishing sustainable healthcare outcomes. Since nurses play a significant role in US and global healthcare systems, healthcare organizations demand empowered nursing leaders that have an equal voice. The significance of this review to the future is to awaken nursing leaders to step away from a dependent mode and to step forward to an empowered mode.

Viscosity iteration in CAT(k) spaces
Bozena Piatek
Mathematics , 2012,
Abstract: We study the approximation of fixed points of nonexpansive mappings in CAT(k) spaces. We show that the iterative sequence generated by the Moudafi's viscosity type algorithm converges to one of the fixed points of the nonexpansive mapping depending on the contraction applied in the algorithm.
The fixed point property and unbounded sets in spaces of negative curvature
Bozena Piatek
Mathematics , 2014,
Abstract: Motivated by the well-known cases of the real Hilbert ball and complete R-trees, being both particular cases of CAT(-1) spaces, we give an affirmative answer to the question of whether the geodesically boundedness property is a necessary and sufficient condition for a closed convex subset K of a complete CAT(k) space, with k < 0, to have the fixed point property for nonexpansive mappings
Retrospecting Polish Audio Engineering Society Membership on 20th Anniversary of the Polish Section of the Audio Engineering Society
Bo ena Kostek, Marianna Sankiewicz
Archives of Acoustics , 2011, DOI: 10.2478/v10168-011-0016-x
Abstract: In this article some key events concerning founding Polish Section of the Audio Engineering Society were presented. In addition, the history covering International Symposia on Sound Engineering and Mastering was outlined. Also, papers contained in this issue were shortly reviewed.
Diseased muscles that lack dystrophin or laminin-α2 have altered compositions and proliferation of mononuclear cell populations
Mahasweta Girgenrath, Christine A Kostek, Jeffrey Miller
BMC Neurology , 2005, DOI: 10.1186/1471-2377-5-7
Abstract: We used fluorescence-activated cell sorting combined with bromodeoxyuridine labeling to examine proliferation rates and compositions of mononuclear cells in diseased and healthy mouse skeletal muscle. We prepared mononucleate cells from muscles of mdx (dystrophin-deficient) or Lama2-/- (laminin-α2-deficient) mice and compared them to cells from healthy control muscles. We enumerated subsets of resident muscle cells based on Sca-1 and CD45 expression patterns and determined the proliferation of each cell subset in vivo by BrdU incorporation.We found that the proliferation and composition of the mononucleate cells in dystrophin-deficient and laminin-α2-deficient diseased muscles are different than in healthy muscle. The mdx and Lama2-/- muscles showed similar significant increases in CD45+ cells compared to healthy muscle. Changes in proliferation, however, differed between the two diseases with proliferation increased in mdx and decreased in Lama2-/- muscles compared to healthy muscles. In particular, the most abundant Sca-1-/CD45- subset, which contains muscle precursor cells, had increased proliferation in mdx muscle but decreased proliferation in Lama2-/- muscles.The similar increases in CD45+ cells, but opposite changes in proliferation of muscle precursor cells, may underlie aspects of the distinct pathologies in the two diseases.In diseased skeletal muscle, damaged myofibers can sometimes be replaced or repaired by mononucleate muscle precursor cells that can commit to myogenesis and fuse to form multinucleate myofibers. In some muscle diseases, progressive loss of muscle function may be due at least in part to a decreasing rate of repair that becomes insufficient to replace lost myofibers. The mononucleate cells in skeletal muscle include the relatively abundant muscle satellite cells and their myoblast progeny, as well as infiltrating inflammatory cells and the much less numerous muscle stem cells [1-4]. In this study, we examine how different subsets of musc
Applying Fourier numerical analysis to determination of tensor elements of the deformations of seed covers
Bozena Gladyszewska,Dariusz Chocyk
Optica Applicata , 2004,
Abstract: A video-extensometry method for studying the mechanical properties of seed covers is presented. Young’s modulus and Poisson’s ratio for the material tested, i.e., seed covers of dried broad beans (Vicia faba) are determined. A microscopic image of thin film gold nets (42 and 162 mm thick) deposited on sample surface was transferred through a camera to computer memory which carried out the analysis of changes occurring in the course of sample tension. Fourier’s numerical analysis was applied to determine tensor elements of deformations of the materials under study. The method is characterized by high measuring accuracy. Another advantage lies in its insensibility to additional boundary effects, which could occur in the vicinity of sample clips.
Page 1 /111
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.