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Search Results: 1 - 10 of 8280 matches for " Victor Sucic "
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An Efficient Algorithm for Instantaneous Frequency Estimation of Nonstationary Multicomponent Signals in Low SNR
Jonatan Lerga,Victor Sucic,Boualem Boashash
EURASIP Journal on Advances in Signal Processing , 2011, DOI: 10.1155/2011/725189
Abstract:
Role of the national energy system modelling in the process of the policy development
Pusnik Matevz,Sucic Boris,Urbancic Andreja,Merse Stane
Thermal Science , 2012, DOI: 10.2298/tsci120109120p
Abstract: Strategic planning and decision making, nonetheless making energy policies and strategies, is very extensive process and has to follow multiple and often contradictory objectives. During the preparation of the new Slovenian Energy Programme proposal, complete update of the technology and sector oriented bottom up model of Reference Energy and Environmental System of Slovenia (REES-SLO) has been done. During the redevelopment of the REES-SLO model trade-off between the simulation and optimisation approach has been done, favouring presentation of relations between controls and their effects rather than the elusive optimality of results which can be misleading for small energy systems. Scenario-based planning was integrated into the MESAP (Modular Energy System Analysis and Planning) environment, allowing integration of past, present and planned (calculated) data in a comprehensive overall system. Within the paper, the main technical, economic and environmental characteristics of the Slovenian energy system model REES-SLO are described. This paper presents a new approach in modelling relatively small energy systems which goes beyond investment in particular technologies or categories of technology and allows smooth transition to low carbon economy. Presented research work confirms that transition from environment unfriendly fossil fuelled economy to sustainable and climate friendly development requires a new approach, which must be based on excellent knowledge of alternative possibilities of development and especially awareness about new opportunities in exploitation of energy efficiency and renewable energy sources.
Cell Death Mechanisms at the Maternal-Fetal Interface: Insights into the Role of Granulysin
Danijela Veljkovic Vujaklija,Sonja Sucic,Tamara Gulic,Marin Dominovic,Daniel Rukavina
Clinical and Developmental Immunology , 2012, DOI: 10.1155/2012/180272
Abstract: During mammal pregnancy, a sensitive balance between hormones, cytokines, humoral factors, and local cellular interactions must be established. Cytotoxic cells infiltrating the decidua are heavily equipped with cytolytic molecules, in particular perforin and granulysin. Granulysin is especially abundant in NK cells which are able to spontaneously secrete high quantities of granulysin. Besides being a potent bactericidal and tumoricidal molecule, granulysin is also found to be a chemoattractant and a proinflammatory molecule. The precise role(s) of granulysin at the maternal-fetal interface has not been elucidated yet. It is possible that it behaves as a double-edged sword simultaneously acting as an immunomodulatory and a host defense molecule protecting both the mother and the fetus from a wide spectrum of pathogens, and on the other hand, in case of an NK cell activation, acting as an effector molecule causing the apoptosis of semiallograft trophoblast cells and consequently leading to various pregnancy disorders or pregnancy loss.
The Analysis of Accelerograms for the Earthquake Resistant Design of Structures  [PDF]
Victor Corchete
International Journal of Geosciences (IJG) , 2010, DOI: 10.4236/ijg.2010.11004
Abstract: In this paper, the analysis of ground motions (displacements, velocities and accelerations) has been performed focused to the seismic design. The relationships between the peak ground acceleration (PGA), the peak ground velocity (PGV), the peak ground displacement (PGD) and the bracketed duration, with the earthquake magnitude, are presented and their validity and applicability for seismic design is discussed. Finally, the dominant periods of the ground motions (displacement, velocity and acceleration) are obtained from their Fourier Spectrum. Their validity and applicability for the seismic design is discussed also. The results presented in this paper show that the relationships that exist between the important parameters: PGA, PGV, PGD and duration; and the earthquake magnitude, allow the prediction of the values for these parameters, in terms of the magnitude for future strong motions. These predictions can be very useful for seismic design. Particularly, the prediction of the magnitude associated to the critical acceleration, because the earthquakes with magnitude greater than this critical magnitude can produce serious damages in a structure (even its collapsing). The application of the relationships obtained in this paper must be very careful, because these equations are dependent on the source area, location and type of structure. The dominant periods of the ground motions (displacement, velocity and acceleration) that are computed and presented in this paper, are also important parameters for the seismic design, because recent studies have shown that the earthquake shaking is more destructive on structures having a natural period around some of these dominant periods. These parameters must also be handled with caution, because they show dependence with the source area, location and type of structure.
The SAFEX-JIBAR Market Models  [PDF]
Victor Gumbo
Journal of Mathematical Finance (JMF) , 2012, DOI: 10.4236/jmf.2012.24035
Abstract: It is possible to construct an arbitrage-free interest rate model in which the LIBOR rates follow a log-normal process leading to Black-type pricing formulae for caps and floors. The key to their approach is to start directly with modeling observed market rates, LIBOR rates in this case, instead of instantaneous spot rates or forward rates. This model is known as the LIBOR Market Model. We formulate the SAFEX-JIBAR market model based on the fact that the forward JIBAR rates follow a log-normal process. Formulae of the Black-type are deduced.
Wave Equation Simulation Using a Compressed Modeler  [PDF]
Victor Pereyra
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33033
Abstract:

Repeated simulations of large scale wave propagation problems are prevalent in many fields. In oil exploration earth imaging problems, the use of full wave simulations is becoming routine and it is only hampered by the extreme computational resources required. In this contribution, we explore the feasibility of employing reduced-order modeling techniques in an attempt to significantly decrease the cost of these calculations. We consider the acoustic wave equation in two-dimensions for simplicity, but the extension to three-dimensions and to elastic or even anysotropic problems is clear. We use the proper orthogonal decomposition approach to model order reduction and describe two algorithms: the traditional one using the SVD of the matrix of snapshots and a more economical and flexible one using a progressive QR decomposition. We include also two a posteriori error estimation procedures and extensive testing and validation is presented that indicates the promise of the approach.

A Fractal Space-Time Structure of Nonequilibrium Living Systems Is Essential Property and Fractal Property of Dynamics Systems on Cosmic Scales Is Foundation for the Origin of the Living Systems  [PDF]
Victor Gusev
Open Journal of Biophysics (OJBIPHY) , 2014, DOI: 10.4236/ojbiphy.2014.42007
Abstract:
The experimental data represented in the bibliography are theoretically analyzed to construct an adequate model for dynamics of an open nonequilibrium living system. It is shown that the viable microorganisms are capable of forming the fractal structure, whose dimensionality is certainly non-integral. In addition, we have attempted to provide a generalized description of the properties of living and nonliving matter (in the addition to that described in work [1]). Relevant published data were used to demonstrate a fractal structure of the space in the vicinity of centrally gravitating bodies with satellites revolving around them along closed trajectories and serving as a kind of testers of the neighboring space. A local violation of its discontinuity is likely to be a necessary (yet not sufficient!) dynamic characteristic of the spatiotemporal continuum for self-organization of molecules into a living, i.e., self-replicating, system.
Teachers’ Perceptions about the Use of Play to Facilitate Development and Teach Prosocial Skills  [PDF]
Michelle Haney, Victor Bissonnette
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.21006
Abstract: The purpose of this study was to investigate teachers’ perceptions about the use of play to promote social, emotional, and cognitive skills to support planning for a school program aimed at increasing inclusive play for young children. This research was inspired by Vivian Gussin Paley’s book, You Can’t Say You Can’t Play (1992). Participants included undergraduate students and graduate education students in the Teacher Education Program at a small liberal arts college, as well as practicing elementary school teachers. The results indicated that graduate students and practicing teachers had a more accurate understanding about the developmental benefits of incorporating play into the classroom and a greater willingness to embrace the “you can’t say you can’t play” rule to promote inclusive play and acceptance. Implications for designing a preventative program for inclusive play in young children are discussed.
Semantic model and optimization of creative processes at mathematical knowledge formation  [PDF]
Victor Egorovitch Firstov
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.28113
Abstract: The aim of this work is mathematical education through the knowledge system and mathematical modeling. A net model of formation of mathematical knowledge as a deductive theory is suggested here. Within this model the formation of deductive theory is represented as the development of a certain informational space, the elements of which are structured in the form of the orientated semantic net. This net is properly metrized and characterized by a certain system of coverings. It allows injecting net optimization parameters, regulating qualitative aspects of knowledge system under consideration. To regulate the creative processes of the formation and realization of mathematical know- edge, stochastic model of formation deductive theory is suggested here in the form of branching Markovian process, which is realized in the corresponding informational space as a semantic net. According to this stochastic model we can get correct foundation of criterion of optimization creative processes that leads to “great main points” strategy (GMP-strategy) in the process of realization of the effective control in the research work in the sphere of mathematics and its applications.
Barriers to Placement of Spirometers in Clinics Affiliated with an Academic Medical Center  [PDF]
Victor O. Kolade
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.31006
Abstract: United States physician office visits for asthma have increased since 1989, and most of these visits are to primary care physicians. The National Institutes of Health has published guidelines for asthma diagnosis and management, implementation of which is expected to result in improved care and reduced costs. Compliance with asthma guidelines has been suboptimal, especially with spirometry recommendations, and more so in primary care clinics than in specialist clinics. Noncompliance has largely been attributed to physician and patient factors. This paper describes an experience with navigation of health system barriers to implementation of spirometry encountered at three primary care clinics affiliated with an internal medicine residency program. Included are perspectives and priorities of key individuals, systems issues related to institutions, and technical issues pertaining to spirometers. Navigation of ACGME core competencies is discussed.
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