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Wyświetlanie 1-15 z 331
Tytuł:
Computer simulation of forest fire on the basis of digital maps and weather forecast
Autorzy:
Szajewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/137030.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Służby Pożarniczej
Tematy:
computer simulation
fire modeling system
forest fire
digital maps of forest
Opis:
The article presents the integration of digital topographic map of forests and short-term weather forecast al lowing to conduct a computer simulation of forest fire. To execute a simulation, a software was produced. The software includes deterministic mathematical model of forest fire, programmed on the basis of developed assumptions. Creation of mentioned environment simulation was based on a need for the optimum planning of extinguishing actions in local fire service centres.
Źródło:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2011, 42; 7-14
0239-5223
Pojawia się w:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive modeling in a VoIP system
Autorzy:
Simionovici, A. M.
Tantar, A. A.
Bouvry, P.
Didelot, L.
Powiązania:
https://bibliotekanauki.pl/articles/308590.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
particle algorithms
prediction
user-profiles
VoIP
Opis:
An important problem one needs to deal with in a Voice over IP system is server overload. One way for preventing such problems is to rely on prediction techniques for the incoming traffic, namely as to proactively scale the available resources. Anticipating the computational load induced on processors by incoming requests can be used to optimize load distribution and resource allocation. In this study, the authors look at how the user profiles, peak hours or call patterns are shaped for a real system and, in a second step, at constructing a model that is capable of predicting trends.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 4; 32-40
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage modeling in graded layer system
Autorzy:
Petaś, M.
Mróz, K.
Doliński, K.
Powiązania:
https://bibliotekanauki.pl/articles/386735.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fatigue damage
low cycle fatigue
functionally graded materials
layers
uszkodzenie zmęczeniowe
niskocyklowe zmęczenie
materiały gradientowe
powłoki
warstwy
Opis:
The simplified approach to the modelling of low cycle fatigue (LCF) of functionally graded materials (FGM) based on the continuum mechanics is presented. The fatigue damage model takes into account the mechanical part of the load and a constant service temperature. The concept of FGM as a particle-reinforced metal-matrix composite with gradual change of the reinforcement fraction is used. The FGM is considered as a material consisting of homogeneous layers containing different volume fractions of the reinforcement. The variation of the reinforcement fraction changes the material properties for each layer. The different material properties are obtained according to modified rule of mixture. Since the fatigue damage of metal matrix composites is strongly influenced by the inelastic deformation of the metallic matrix, the constitutive equations of LCF damage model are taken into consideration. The combined isotropic/kinematic hardening model with linear behaviour of isotropic and kinematic parts of hardening is adopted. The damage scalar parameter is associated with the plastic energy dissipation which is used to update the material properties. The fatigue damage model presented in this paper is applied to the fatigue damage analysis of the cooling channel of thruster used in space shuttles and rockets.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 2; 99-106
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Human Performance Cognitive-Behavioral Modeling: A Benefit for Occupational Safety
Autorzy:
Gore, B. F.
Powiązania:
https://bibliotekanauki.pl/articles/89933.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
modeling system safety
human performance modeling
human factors methodology
bezpieczeństwo pracy
badanie czynności
komputer
czynnik ludzki
wspomaganie komputerowe
modelowanie działań ludzkich
narzędzia informatyczne
Opis:
Human Performance Modeling (HPM) is a computer-aided job analysis software methodology used to generate predictions of complex human automation integration and system flow patterns with the goal of improving operator and system safety. The use of HPM tools has recently been increasing due to reductions in computational cost, augmentations in the tools’ fidelity, and usefulness in the generated output. An examination of an Air Man-machine Integration Design and Analysis System (Air MIDAS) model evaluating complex human-automation integration currently underway at NASA Ames Research Center will highlight the importance to occupational safety of considering both cognitive and physical aspects of performance when researching human error.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 3; 339-351
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of system modeling and the simulation of photovoltaic production
Autorzy:
Glaa, R.
Jeddi, N.
Lakhoua, N.
Amraoui, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/102422.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
photovoltaic systems
Maximum Power Point Tracking (MPPT)
systemic modelin
OOPP method
Opis:
The major goal of electric power companies is to give the quantity of electricity claimed by each consumer. This does not function without posing problems because consumption increases with time and the production will not be adequate to cope with the need for electricity. Besides, we may face environmental issues such as the increase of CO2 in the world, the conditions of producing energy, the difficulty of easily, quickly and economically storing large quantities of electricity. One of the solutions that could restrict and solve the problems is the production of renewable energy. In this paper, we focus on photovoltaic products; we present the photovoltaic conversion chain such as modeling, adaptation and control systems, as well as photovoltaic characteristics and system analysis methodology and planning of a photovoltaic system based on the OOPP method (Objectives Oriented Project Planning).
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 48-55
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maritime Transportation System Safety – Modeling and Identification
Autorzy:
Dziula, P.
Kołowrocki, K.
Soszyńska-Budny, J.
Powiązania:
https://bibliotekanauki.pl/articles/116563.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
safety at sea
maritime transportation
safety system
Opis:
The article is showing a concept of critical infrastructure systems’ safety states model. Model construction is basing on: popular technical systems’ safety states models, and notions specified in acts of law and other studies concerning crisis management. Paper is including some concept of proposed model usage possibilities ‐ methods and procedures for estimating unknown basic parameters of safety states transitions process: identifying the distributions of its conditional lifetime at safety states, estimating probabilities of its staying at safety states at the initial moment, probabilities of its transitions between safety states and parameters of the distribution for the description of its conditional lifetimes at safety states.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 2; 169-175
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship’s diesel electrical system availability modeling
Autorzy:
Mennis, E.
Nikitakos, N.
Platis, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069679.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
Markov
diesel generators
PRA
reliability
Opis:
One of the most critical systems for a ship operation is the diesel generator set. This is why the ship preserves four different diesel generators except the power battery packs. The paper describes the generator operations and the main failure conditions. Assuming that the failure rate of the system parts is constant the paper show how the diesel generator system could be modelled in the context of Markov theory.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 303--308
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stepper motor open-loop control system modeling and control strategy optimization
Autorzy:
Zhang, Deode
Wang, Jingqi
Qian, Lei
Yi, Jun
Powiązania:
https://bibliotekanauki.pl/articles/141113.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acceleration and deceleration control
open loop control
stepper motor
subdivision control
system modeling
Opis:
The study of the subdivision driving technology of a stepper motor and two types of typical acceleration and deceleration curves aims at optimizing the open-loop control performance of the stepper motor. The simulation model of a two-phase hybrid stepper motor open-loop control system is set up based on the mathematical model of the stepper motor, in order to let the stepper motor have the smaller stepper angle, two types of typical acceleration and a deceleration curve algorithm are designed for the real- time online calculation based on the subdivision driving technology. It respectively carries out the simulation analysis for their control effects. The simulation results show that the parabolic acceleration and deceleration curves have a larger maximum in-step rotation angle and the faster dynamic response ability in the same control period, and at the same time, the position tracking error of an intermediate process is smaller.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 63-75
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the pelvis position in the sagittal plane on loads in the human musculoskeletal system
Autorzy:
Michnik, Robert
Zadoń, Hanna
Nowakowska-Lipiec, Katarzyna
Jochymczyk-Woźniak, Katarzyna
Myśliwiec, Andrzej
Mitas, Andrzej W.
Powiązania:
https://bibliotekanauki.pl/articles/27324108.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mathematical modeling
Anybody Modeling System
loads
lumbo-pelvic-hip complex
physiotherapy
physiopromotion
modelowanie matematyczne
system modelowania dla każdego
masa
kompleks lędźwiowo-miedniczo-biodrowy
fizjoterapia
fizjopromocja
Opis:
Purpose: The research work aimed to perform the mathematical modelling-based assessment concerning the effect of the position of the pelvis in the sagittal plane on loads present in the musculoskeletal system in the standing position. Methods: The analysis of the effect of various positions of the pelvis was performed using the Free Posture Model in the AnyBody Modeling System software. Simulated positions involving various values of pelvis inclination ranged from the extreme pelvic retroposition (–7°) through normative values (0–23°) to the extreme pelvic anteversion (33°). Results: The lowest resultant reaction forces in the intervertebral joints recorded for an angle of inclination restricted within the range of 9–27° and segment L5–S1 amounted to less than 0.7 BW. A change in the pelvic inclination from the normative values towards retroposition or anteversion resulted in the increased muscular activity of the erector spinae, transverse abdominal muscles as well as internal and external oblique muscles. Regarding the lower limbs, changes in the activity were observed in the biceps femoris muscle, iliac muscle, gluteus minimus, gluteus medius and the gluteus maximus. Conclusion: The results obtained in the research-related tests confirmed that the pelvic inclination affects loads present in the musculoskeletal system. The abovenamed results will be used to develop therapeutic exercises aimed to reduce loads present in the musculoskeletal system. The aforesaid exercises will be used to teach participants how to properly position their pelvis and how to activate individual groups of muscles.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 3; 33--42
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Availability phase estimation in gas turbine based on prognostic system modeling
Autorzy:
Saadat, B.
Kouzou, A.
Guemana, M.
Hafaifa, A.
Powiązania:
https://bibliotekanauki.pl/articles/328930.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
availability time
fatigue prediction
fault prognosis
gas turbine
prognostic system
czas dostępności
zmęczenie materiału
prognoza
prognozowanie uszkodzeń
turbina gazowa
system prognostyczny
Opis:
The present paper deals mainly with the improvement of the degradation indicators of a gas turbine. Therefore, to achieve this purpose a prognostic approach is used in order to provide an adequate diagnostic function of the studied gas turbine. In this context, this paper proposes a degradation modeling of the studied gas turbine system in order to increase its safety and to ensure accurate future decision making process that allow to enhance the operating state of this industrial equipment. Indeed, the prognostic system proposed in this work takes into account the eventual vibration impacts over all phases of the life cycle process of the studied system to provide a diagnostic function with the required availability at with lowest maintenance cost.
Źródło:
Diagnostyka; 2017, 18, 2; 3-11
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D CAD model for a quadrotor system modeling and control
Autorzy:
Raheemah, Fatima A.
Hussein, Mustafa T.
Powiązania:
https://bibliotekanauki.pl/articles/2096198.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
quadrotor
SimMechanics/MATLAB
CAD model
unmanned aerial vehicles
model CAD
bezzałogowe statki powietrzne
Opis:
In this paper, the work focus on the advantages of several engineering software to present a case study for the quadrotor system by a used 3D CAD model. The CAD model initially generated using one of the CAD software and it can be accessed from MATLAB software and converted into a virtual physical model. Quadrotors are unmanned aerial vehicles capable of vertical takeoff, hovering, and landing. The quadrotor is distinguished by its small size, flexibility, and maneuverability. The small sensors and actuators used in these systems are effective enough in comparison with the larger systems. The CAD model for the quadrotor system in this study is used to show the capability of the 3D model implementation in modeling and control. These models echo on the real-time models to improve the behavior in the real world. The actual quadrotor device was converted from the real system to a 3D model. Also, the model is converted to SimMechanics for the sake of simulation. Two different control methods are used in this work to stable the motion of the quadrotor system. First the adaptive sliding mode controller with the adaptive controller. Second the adaptive sliding mode controller with the PID controller. The simulation results show the model works fine with the controllers and it preserves the desired position and attitude along the desired predefined path. The results shown when a comparison was made that the ratio of error for PID controller is better.
Źródło:
Diagnostyka; 2022, 23, 2; art. no. 2022203
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peirce, Sebeok, and the Semiotic Reformation on Contemporary Communications
Autorzy:
Magsino, Maria Asuncion L.
Powiązania:
https://bibliotekanauki.pl/articles/507250.pdf
Data publikacji:
2018-03-30
Wydawca:
International Étienne Gilson Society
Tematy:
language
communication
sign
signification
semiosis
Charles S. Peirce
Thomas A. Sebeok
modeling system
John Deely
postmodernism
suprasubjective nature of sign
modeling theory
truth
icon of reality
Opis:
Language in a broad sense becomes imperative for communication to ensue. Language considered as a system of signs and signification is achieved through a process involving sign relations, e.g. semiosis. Charles S. Peirce’s Theory of Signs can provide a basic framework for the elucidation of the intelligibility of signs. Furthermore, the ability for generating sign processes in an organized manner is determined by what Thomas A. Sebeok designates as an organism’s modeling capacity. Modeling capacities range from primitive to complex, thus generating three orders of language corresponding to language as a Primary Modeling System (PMS), a Secondary Modeling System (SMS) and a Tertiary Modeling System (TMS). This Peirce-Sebeok framework for communication, which John Deely places as “postmodern,” is premised upon what he designates as the suprasubjective nature of sign relations and their equally suprasubjective function. Thus, Sebeok’s Modeling Theory together with Peirce’s doctrine on the nature and behavior of signs can be used to direct the generation as well as the interpretation of language systems in accordance with the ultimate norm of communication, that is, to reflect truth as an icon of reality.
Źródło:
Studia Gilsoniana; 2018, 7, 1; 11-31
2300-0066
Pojawia się w:
Studia Gilsoniana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information System of Coffee Product Sales
Autorzy:
Krasilchuk, Svitlana
Shestakevych, Tetiana
Powiązania:
https://bibliotekanauki.pl/articles/1833892.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
marketplace
sales
system modeling
coffee product sales
Opis:
Forced to develop the online component of the sales strategy, small and medium business requires well-designed information systems and technologies, that will fulfill all the needs and allow working in an actual – distant – business environment. Using digital platforms sometimes became a matter of need for coffee trading. Although digital marketplaces exist in a variety of branches, the specialized platform seems to be the better choice for coffee products sales because of its international specifics. Modeling the process of tasks performing in the information system of coffee products sales, its dynamic aspects, time-ordered interaction of objects in it, will allow designing thoroughly thought out information system, realized with actual software methods and means.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2020, 9, 1; 3--9
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business process modeling and analysis system
Modelowanie procesów biznesowych i analiza systemowa
Autorzy:
Milewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/359365.pdf
Data publikacji:
2010
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
BPMN
UML
model przedsiębiorstwa
system informatyczny
business model
information system
Opis:
The paper is characterized by efforts to create a business model of enterprise software and technical documentation. The author points out that the overriding factor is to identify actions to modeling, which defines the scope of the project. In mapping the organization and construction of scenarios of business processes is of paramount importance dictionary of phrases and descriptions of domain rules of correctness for the recording and processing. The author describes the key process models, partial (procedures) and elementary (the workflow map.) This indicates the suitability of BPMN and UML notation in the record of the mapping rules and modalities for the functioning of the organization and in the description of static and dynamic structure of the system. Pointing to the integration of business process management system architecture author assesses the suitability of the chosen modeling notation.
Artykuł charakteryzuje działania mające na celu utworzenie biznesowego modelu przedsiębiorstwa oraz dokumentacji technicznej oprogramowania. Autor dowodzi, że nadrzędnym czynnikiem działań jest określenie celu modelowania, który definiuje zakres projektu. W odwzorowaniu organizacji i budowie scenariuszy procesów biznesowych fundamentalne znaczenie ma słownik zwrotów dziedzinowych i opis reguł poprawności dotyczących zapisu i przetwarzania danych. Autor opisuje modele procesów głównych, cząstkowych (procedury) oraz elementarnych (mapę przepływu pracy). Wskazuje na przydatność notacji BPMN i UML w zapisie odwzorowującym zasady i sposoby funkcjonowania organizacji oraz w opisie statycznej i dynamicznej struktury systemu informatycznego. Wskazując na integrację procesu zarządzania biznesowego z architekturą systemu informatycznego, autor dokonuje oceny przydatności wybranych notacji w zakresie modelowania.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 24 (96); 59-62
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional discrete model of an electrical drive with brushless micro-motor
Autorzy:
Matusiak, M.
Bąkała, M.
Wojciechowski, R.
Ostalczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/200454.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system modeling
system identification
fractional order calculus
Opis:
The use of fractional-order calculus for system modeling is a good alternative to well-known classic integer-order methods, primarily due to the precision with which the modeled object may be mapped. In this study, we created integer and fractional discrete models of a real object – a highspeed brushless micro-motor. The accuracy of the models was verified and compared.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 421-427
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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