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Wyszukujesz frazę "control analysis" wg kryterium: Temat


Tytuł:
Controlling in the Process of Managing a Modern Enterprise
Autorzy:
Dźwigoł, H.
Bezchasnyi, O.
Powiązania:
https://bibliotekanauki.pl/articles/2064963.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
control functions
control analysis
implementation of controlling
Opis:
The aim of the article is the analysis of controlling in relation to the management of a contemporary enterprise. Against this background, the essence and concept of controlling, its classification and importance for the development of the company were presented. The scope of controlling applications in enterprises' operations depends mainly on the needs of management staff and their managerial awareness. The fact that the views concerning him are not unambiguous, they do not have a universal form, equally understood terms and tasks, strictly defined and assigned actions or methods, is of great significance. The area with which controlling is related applies to all areas of the company's operations. Support for business management takes place in the area of the entire organization. Controlling with its instruments reaches everywhere, coordinates management in all company's cells. Presented premises in the scope of organization of controlling in enterprises, allow to state that the smaller enterprise, the more often controlling appears as a linear cell or a group of cells located in the linear hierarchy. In addition, they indicate that the time of implementation of controlling in the case of large enterprises (in this case also state-owned) is longer than in enterprises from the SME sector (most often private), which is mainly related to the reluctant attitude to changes of employees and management of these organizations, and their internal adjustments.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 577--585
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metabolic control analysis of integrated energy metabolism in permeabilized cardiomyocytes - experimental study
Autorzy:
Tepp, Kersti
Timohhina, Natalja
Chekulayev, Vladimir
Shevchuk, Igor
Kaambre, Tuuli
Saks, Valdur
Powiązania:
https://bibliotekanauki.pl/articles/1040302.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cardiomyocytes
creatine kinase
metabolic control analysis
respiration
mitochondria
Opis:
The main focus of this research was to apply Metabolic Control Analysis to quantitative investigation of the regulation of respiration by components of the Mitochondrial Interactosome (MI, a supercomplex consisting of ATP Synthasome, mitochondrial creatine kinase (MtCK), voltage dependent anion channel (VDAC), and tubulin) in permeabilized cardiomyocytes. Flux control coefficients (FCC) were measured using two protocols: 1) with direct ADP activation, and 2) with MtCK activation by creatine (Cr) in the presence of ATP and pyruvate kinase-phosphoenolpyruvate system. The results show that the metabolic control is much stronger in the latter case: the sum of the measured FCC is 2.7 versus 0.74 (ADP activation). This is consistent with previous data showing recycling of ADP and ATP inside the MI due to the functional coupling between MtCK and ANT and limited permeability of VDAC for these compounds, PCr being the major energy carrier between the mitochondria and ATPases. In physiological conditions, when the MI is activated, the key sites of regulation of respiration in mitochondria are MtCK (FCC = 0.93), adenine nucleotide translocase ANT (FCC = 0.95) and CoQ cytochrome c oxidoreductase (FCC = 0.4). These results show clearly that under the physiological conditions the energy transfer from mitochondria to the cytoplasm is regulated by the MI supercomplex and is very sensitive to metabolic signals.
Źródło:
Acta Biochimica Polonica; 2010, 57, 4; 421-430
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data mining model for quality control of primary aluminum production process
Autorzy:
Horvath, M.
Vircikova, E.
Powiązania:
https://bibliotekanauki.pl/articles/406754.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality control analysis
data mining
multivariate autocorrelated process
quality improvement
Opis:
Traditional statistical process control approaches are less effective in dealing with multivariate and autocorrelated processes. With the continual increase in process complexity, this inefficiency is becoming more apparent. A special type of multivariate and autocorrelated process is a process occurring within a heterogeneous production environment (a variety of types of machines, pots, etc. used for the same task). This makes the quality control of such processes more difficult. The approach presented in the paper utilizes time series fitting, cluster analysis and association mining in relation to a single data mining model for the analysis of complex multivariate autocorrelated processes. The aim is to divide the production cells (machines, pots, etc.) into groups exhibiting similar behaviors. This can then be used for more effective quality control of the entire process and afterwards to analyze the reasons for this behavior. This paper includes someof the results obtained from applying the model to an actual multivariate high autocorrelated process, the production of primary aluminum using the Hall-Heroult electrolysis process. The Hall-Heroult electrolysis process is a continual process that is ongoing in several pots simultaneously. The average plant operates 300 pots. Therefore, the quality control of such a complex process faces many issues concerning monitoring and problem diagnosis. The paper describes a method for dividing the pots into control groups exhibiting similar behaviors, which can then be used in the planning phase of the quality control analysis and to make improvements within these groups and thereby within the whole process.
Źródło:
Management and Production Engineering Review; 2012, 3, 4; 47-53
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic control of ship motion conducting search in open waters
Autorzy:
Kula, Krzysztof Stefan
Powiązania:
https://bibliotekanauki.pl/articles/1573705.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
computer control
IMC control
safety and risk analysis
Opis:
In this work a search operation support system is presented, which is an additional autopilot function block. Its task is to lead a vessel included in the search by the SAR services to the datum position on the basis of the data entered by the operator into the system and then automatically to search the indicated area according to the newly defined search pattern. The set goal can be achieved thanks to the autopilot that guides the ship along a given trajectory consisting of straight lines and arcs. High control accuracy is provided by the IMC control system using a relatively simple non-linear ship model. The simulation tests of the tanker model confirmed that the indicated search area can be precisely checked in a shorter time than when using the expanding square search pattern.
Źródło:
Polish Maritime Research; 2020, 4; 157-169
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive approach to the inventory control system improvement
Autorzy:
Krajčovič, M.
Plinta, D.
Powiązania:
https://bibliotekanauki.pl/articles/407413.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inventory control system
inventory analysis
ABC/XYZ analysis
Opis:
This paper describes a methodology for inventory analysis and reduction, which was developed at the Department of Industrial Engineering, Faculty of Mechanical Engineering, University of Zilina. The methodology describes the optimal procedure for the application of basic analytical methods and tools in practice. The results of the analysis are in the algorithm linked to the subsequent actions realized to improve inventory management system and to minimize inventory level in the company. Described procedure is the result of methodology examination and verification in practical conditions of production enterprises. In the following sections of this paper, there are presented a comprehensive approach to the inventory analysis and the own algorithm, which contains 3 phases: inventory analysis on enterprise level, summary analysis of individual item groups and individual analysis of material items. In the last section, there are described examples of results from such analysis and conclusions. The presented approach is an attempt to create a universal procedure of analysis which integrates methods and tools described in various publications.
Źródło:
Management and Production Engineering Review; 2012, 3, 3; 34-44
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bridges with adaptive railway track
Mosty z samo-ataptującym się torem kolejowym
Autorzy:
Flont, P.
Holnicki-Szulc, J.
Powiązania:
https://bibliotekanauki.pl/articles/281398.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
adaptive bridges
shape control
dynamic analysis
Opis:
The concept of an adaptive railway track, consisting of sleepers initially elevated (with the curvature tailored according to the detected, coming train) and then yielding in a controlled way under the moving vehicle is discussed. The problem formulated as a shape control requiring the minimum integral measure of the track deflection gives, as a side effect, a significant reduction of the corresponding integral measure of the dynamic contact forces between the track and wheels.
Omówiona koncepcja samo-adaptującego się toru kolejowego opiera się na zastosowaniu inteligentnych podkładów. Podkłady, których wysokość może być zmieniana dzięki wyposażeniu ich w siłowniki, zastępują podkłady (mostownice) na moście. Idea adaptacyjnego toru polega na wstępnym uniesieniu toru, którego krzywizna dopasowana jest do zidentyfikowanego, nadjeżdżającego pociągu i następnie w kontrolowany sposób opuszczaniu pod przejeżdżającym pociągiem. Zdanie zstało sformułowane jako sterowanie kształtem toru przy założeniu minimalizacji całkowitej miary uogólnionego przemieszczenia toru. Jako efekt uboczny można spodziewać się znacznej redukcji skojarzonej całkowitej miary dynamicznego przyrostu obciążenia powstającego pomiędzy torem a kołami pociągu.
Źródło:
Journal of Theoretical and Applied Mechanics; 2002, 40, 3; 533-547
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discriminant Analysis and Optimization Applied to Vibration Signals for the Quality Control of Rotary Compressors in the Production Line
Autorzy:
Reis, Déborah
Vanzo, Fernanda
Reis, Jorge
Duarte, Marcus
Powiązania:
https://bibliotekanauki.pl/articles/176740.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
discriminant analysis
noise
optimization
quality control
Opis:
In this paper, the applications of the multivariate data analysis and optimization on vibration signals from compressors have been tested on the assembly line to identify nonconforming products. The multivariate analysis has wide applicability in the optimization of weather forecasting, agricultural experiments, or, as in this case study, in quality control. The techniques of discriminant analysis and linear program were used to solve the problem. The acceleration and velocity signals used in this work were measured in twenty-five rotating compressors, of which eleven were classified as good baseline compressors and fourteen with manufacturing defects by the specialists in the final acoustic test of the production line. The results obtained with the discriminant analysis separated the conforming and nonconforming groups with a significance level of 0.01, which validated the proposed methodology.
Źródło:
Archives of Acoustics; 2019, 44, 1; 79-87
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of extreme value analysis in the assessment of budget variance risk
Autorzy:
Kes, Zdzisław
Kuźmiński, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/425201.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
budgetary control
statistical methods of budgetary control
extreme value analysis
Opis:
This paper presents the methods for the evaluation of budget variance risk, i.e. the risk of a difference between the budgeted and actual figures. The postulated approach is based on extreme value analysis (EVA), to offer, among other things, the evaluation of maxima distribution parameters for studied phenomena. The proper recognition of these parameters yields potential for calculation of probabilities for budget variance to pass certain levels established as critical. This methodology can be used to evaluate deviation levels by time period, and to compare them against historical data. The main objective of this paper was to examine the utility of the theory of extreme values in the estimation of budget deviation risks. The study presents the results of probabilistic analyses of data obtained from a budgetary cost control unit of a production company located in eastern Poland, for the period of 2011-2012. The developed method of analysis and assessment of budget deviations is in line with the development of concepts and methods of management accounting.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 2; 80-98
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the linear form of dynamical equations of the satellite attitude control system for its analysis and synthesis
Autorzy:
Moldabekov, Meirbek
Sukhenko, Anna
Shapovalova, Darya
Yelubayev, Suleimen
Powiązania:
https://bibliotekanauki.pl/articles/1839688.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
synthesis
stability analysis
attitude control system
satellite
Opis:
At present, the methods based on using linearized dynamical equations are applied for syn- thesis of an attitude control system of a satellite with nonlinear dynamics. Linearized equa- tions describe the satellite dynamics approximately, which is the main their disadvantage. This article shows that basing on the angular momentum theorem, the nonlinear dynamical equations of the satellite attitude control system can be represented in the form of linear differential equations with variable coefficients, which makes it possible to use engineering methods of stability analysis and analysis of transient quality in the process of synthesis of the satellite attitude control system.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 109-120
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Movement Control of a 12-Legged Mobile Robot
Autorzy:
Rysiński, J.
Gola, B.
Kopeć, J.
Powiązania:
https://bibliotekanauki.pl/articles/384992.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
mobile robot
design
control
kinematic analysis
Opis:
In the present paper, design and performance of 12-legged walking robot is described. The complete technical specification was developed for the proposed solution. The analysis of stability of the robot movements was undertaken. Communication between robot and operator is based on remote control procedures performed by means of own software which is written in versions for smartphone or desktop computer. The software version for desktop computers has additional useful features i.e. monitoring of the area of robot work/activity via a wireless camera mounted on fore side of the robot.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2015, 9, 4; 39-47
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensuring Organisational Security from the Perspective of Security Sciences
Autorzy:
Płonka, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/1808093.pdf
Data publikacji:
2019-04-11
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
organisational security
control models
risk analysis
Opis:
This paper is dedicated to the topic of security in the context of activities carried out by organisations. The analysis of the security-related context of the enterprises, decisions and threats that often co-occur with organisational activities is an interesting challenge for a researcher. The aspiration to ensure their own survival and undisturbed development is the basic driving force behind all organisations. In the following paper, the author explains the meaning of basic terms connected with the aforementioned issues, such as uncertainty, risk and security. The models and dimensions of control are discussed consecutively, as well as the methods and techniques utilised in risk assessment. Control and risk analysis are currently the means of counteracting threats that is most commonly used in organisations. The aim of the paper is to carry out the review of the hitherto existing research stipulations regarding the sphere of organisational security. The author points out that the problem of organisational security, treated as a core research subject, may be successfully developed and elaborated within the framework of security sciences discipline.
Źródło:
Security Dimensions; 2018, 28(28); 122-140
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of the Calculation Assumptions Applied to Solutions of the Acoustic Measurements Uncertainty
Autorzy:
Batko, W.
Bal, R.
Powiązania:
https://bibliotekanauki.pl/articles/176297.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environmental noise control
statistical analysis
acoustic measurement
uncertainty
Opis:
The assessment of the uncertainty of measurement results, an essential problem in environmental acoustic investigations, is undertaken in the paper. An attention is drawn to the – usually omitted – problem of the verification of assumptions related to using the classic methods of the confidence intervals estimation, for the controlled measuring quantity. Especially the paper directs attention to the need of the verification of the assumption of the normal distribution of the measuring quantity set, being the base for the existing and binding procedures of the acoustic measurements assessment uncertainty. The essence of the undertaken problem concerns the binding legal and standard acts related to acoustic measurements and recommended in: ‘Guide to the expression of uncertainty in measurement’ (GUM) (OIML 1993), developed under the aegis of the International Bureau of Measures (BIPM). The model legitimacy of the hypothesis of the normal distribution of the measuring quantity set in acoustic measurements is discussed and supplemented by testing its likelihood on the environment acoustic results. The Jarque-Bery test based on skewness and flattening (curtosis) distribution measures was used for the analysis of results verifying the assumption. This test allows for the simultaneous analysis of the deviation from the normal distribution caused both by its skewness and flattening. The performed experiments concerned analyses of the distribution of sound levels: LD, LE, LN, LDWN, being the basic noise indicators in assessments of the environment acoustic hazards.
Źródło:
Archives of Acoustics; 2014, 39, 2; 199-202
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation and experimental results of hybrid electric machine with a novel flux control strategy
Autorzy:
Paplicki, P.
Wardach, M.
Bonisławski, M.
Pałka, R.
Powiązania:
https://bibliotekanauki.pl/articles/140694.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PM machines
FEM analysis
experimental results
control strategy
field control capability
efficiency maps
Opis:
The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 37-51
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The nonsmooth maximum principle
Autorzy:
Clarke, F. H.
Pinho, M. R. de
Powiązania:
https://bibliotekanauki.pl/articles/970885.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
Pontryagin maximum principle
nonsmooth analysis
Opis:
We present a brief survey of the nonsmooth maximum principle of optimal control, focusing, in particular, upon the alternative forms of the adjoint equation. We obtain a new version of the theorem that asserts for the first time the full Weierstrass condition together with the Euler form of the adjoint equation, thereby extending a result of de Pinho and Vinter. The new theorem also features stratified hypotheses and conclusions. Two examples illustrate its use.
Źródło:
Control and Cybernetics; 2009, 38, 4A; 1151-1167
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pilot subjective decisions in aircraft active control system
Subiektywne decyzje pilota w aktywnym układzie sterowania samolotu
Autorzy:
Rohacs, J.
Kasyanov, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/280939.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
active control system
endogenous system
subjective analysis
Opis:
The aircraft conventional control systems including pilot-operators in loop are called as active endogenous systems, because the pilots react actively to real situations evaluated by them and their solutions origin from their minds, from the nervous system. The pilots must make decisions in situations characterised by lack of information, human robust behaviour and their individual capabilities. So, decisions born from reactions of pilot are an effect of subjective analysis. This paper investigates the aircraft landing. The subjective factor is the ratio of required and available time to decision on the go around. The decision depends on the available information and psycho-physiological condition of operator pilots and can be determined with the use of theory of statistical hypotheses. This paper introduces a modified Lorenz attractor for the modelling of the endogenous dynamics of the given active system.
Konwencjonalne układy sterowania samolotem, włączając w to rolę pilotów, nazywane są aktywnymi układami endogennymi z racji znaczenia bieżącej oceny sytuacji i reakcji pilotów wynikających z ich świadomości i cech układu nerwowego. Piloci muszą podejmować decyzje w warunkach braku pełnej informacji o parametrach lotu, posiadając przy tym swoiste cechy reaktywnych zachowań i własny zestaw wytrenowanych nawyków. W ten sposób analiza właściwości monitorowania samolotu staje się badaniem układu zawierającego zmienne subiektywne. W pracy zbadano problem podejścia do lądowania. Za czynnik subiektywny wzięto stosunek czasu wymaganego do faktycznie posiadanego przed podjęciem decyzji o możliwej rezygnacji z lądowania. Decyzja ta zależy od ilości zgromadzonych informacji w danej chwili oraz kondycji psycho-fizjologicznej pilotów i została opisana za pomocą hipotez statystycznych. Do zamodelowania dynamiki rozważanego endogennego układu sterowania samolotem użyto zmodyfikowanego atraktora Lorentza.
Źródło:
Journal of Theoretical and Applied Mechanics; 2011, 49, 1; 175-186
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoreticheskie obosnovanie ispolzovanija magnitnogo strukturnogo analiza dlja otsenki mekhanicheskikh svojjstv detalejj
The theoretical grounding of using of the magnetic structural analysis to evaluate the properties of details
Autorzy:
Vlasovec, V.
Naymenko, A.
Zaiec, V.
Powiązania:
https://bibliotekanauki.pl/articles/76503.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
structural analysis
agricultural equipment
magnetic control
mechanical property
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 7
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second order sufficient conditions and sensitivity analysis for optimal multiprocess control problems
Autorzy:
Augustin, D.
Maurer, H.
Powiązania:
https://bibliotekanauki.pl/articles/206723.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multiprocess control systems
Riccati equations
robot control
second order sufficient conditions
sensitivity analysis
Opis:
Second order sufficient optimality conditions (SSC) are derived for optimal multiprocess control problems. For that purpose the multiprocess control problem is transformed into a single stage control problem with augmented state variables which comprise the state variables of all individual stages as well as the switching times as choice variables. This toansformation allows to apply the known SSC for single stage control problems. A numerical test of SSC involves the solution of an associated Riccati equation together with boundary conditions adapted to the multiprocess. Sensitivity analysis of parametric multiprocess problems can be based on SSC. A numerical example of the optimal two-stage control of a robot illustrates both SSC and sensitivity analysis.
Źródło:
Control and Cybernetics; 2000, 29, 1; 11-31
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive inventory control system for material items with continuous non-stationary demand
Autorzy:
Krajčovič, M.
Plinta, D.
Powiązania:
https://bibliotekanauki.pl/articles/406736.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inventory control
algorithm
non-stationary demand
joint replenishment
inventory analysis
Opis:
This paper describes an algorithm of dynamic inventory control system for large numbers of material items with continuous non-stationary demand. It uses principles of pull inventory control systems, statistical inventory analysis and joint replenishment inventory systems. This algorithm was processed in software module (VBA for Excel) and applied in practice. The target of described algorithm is to keep an optimum inventory level and optimum customer service level in terms of inventory control of items with non-stationary demand.
Źródło:
Management and Production Engineering Review; 2014, 5, 1; 11-20
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating individual differences with qualitative research methods: Results of a meta-analysis of leading applied linguistics journals
Autorzy:
Albert, Ágnes
Csizér, Kata
Powiązania:
https://bibliotekanauki.pl/articles/2143611.pdf
Data publikacji:
2022-06-21
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
qualitative research
individual differences
quality control
meta-analysis
systematic review
Opis:
The aim of the present article is to provide a systematic review of qualitative studies in the leading journals of our field focusing on their distributional properties in the various journals as well as topic choice and selected quality control issues. In order to achieve this aim, we carried out a systematic review of research articles published in leading journals in our field, namely, Applied Linguistics, Language Learning, Language Teaching Research, Studies in Second Language Acquisition and Modern Language Journal between 2016 and 2020. Our sample contains 93 articles in which researchers employed qualitative research methods or mixed methods including a qualitative component. Our main results indicate that there is great variation among journals in terms of the number of qualitative studies. As for topic considerations, some traditional individual difference variables seem to have a dominant role, with cognitive processes involved in language acquisition gaining some ground as well. Concerning quality control issues, there could be room for improvement with regard to reporting the quality control measures, including the tools employed in the studies. Based on our results, we can conclude that a more systematic understanding of acceptable processes in the field of applied linguistics could increase not only the number of qualitative articles published but also their topical importance.
Źródło:
Studies in Second Language Learning and Teaching; 2022, 12, 2; 303-335
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constrained Output Iterative Learning Control
Autorzy:
Yovchev, Kaloyan
Delchev, Kamen
Krastev, Evgeniy
Powiązania:
https://bibliotekanauki.pl/articles/229181.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
constrained output systems
convergence analysis
iterative learning control
robot manipulators
Opis:
Iterative Learning Control (ILC) is a well-known method for control of systems performing repetitive jobs with high precision. This paper presents Constrained Output ILC (COILC) for non-linear state space constrained systems. In the existing literature there is no general solution for applying ILC to such systems. This novel method is based on the Bounded Error Algorithm (BEA) and resolves the transient growth error problem, which is a major obstacle in applying ILC to non-linear systems. Another advantage of COILC is that this method can be applied to constrained output systems. Unlike other ILC methods the COILC method employs an algorithm that stops the iteration before the occurrence of a violation in any of the state space constraints. This way COILC resolves both the hard constraints in the non-linear state space and the transient growth problem. The convergence of the proposed numerical procedure is proved in this paper. The performance of the method is evaluated through a computer simulation and the obtained results are compared to the BEA method for controlling non-linear systems. The numerical experiments demonstrate that COILC is more computationally effective and provides better overall performance. The robustness and convergence of the method make it suitable for solving constrained state space problems of non-linear systems in robotics.
Źródło:
Archives of Control Sciences; 2020, 30, 1; 157-176
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iterative learning control with sampled-data feedback for robot manipulators
Autorzy:
Delchev, K.
Boiadjiev, G.
Kawasaki, H.
Mouri, T.
Powiązania:
https://bibliotekanauki.pl/articles/229323.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sampled-data systems
iterative learning control
robot manipulators
convergence analysis
Opis:
This paper deals with the improvement of the stability of sampled-data (SD) feedback control for nonlinear multiple-input multiple-output time varying systems, such as robotic manipulators, by incorporating an off-line model based nonlinear iterative learning controller. The proposed scheme of nonlinear iterative learning control (NILC) with SD feedback is applicable to a large class of robots because the sampled-data feedback is required for model based feedback controllers, especially for robotic manipulators with complicated dynamics (6 or 7 DOF, or more), while the feedforward control from the off-line iterative learning controller should be assumed as a continuous one. The robustness and convergence of the proposed NILC law with SD feedback is proven, and the derived sufficient condition for convergence is the same as the condition for a NILC with a continuous feedback control input. With respect to the presented NILC algorithm applied to a virtual PUMA 560 robot, simulation results are presented in order to verify convergence and applicability of the proposed learning controller with SD feedback controller attached.
Źródło:
Archives of Control Sciences; 2014, 24, 3; 299-319
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants of corruption: a panel data analysis of Visegrad countries
Autorzy:
Linhartová, Veronika
Halásková, Martina
Powiązania:
https://bibliotekanauki.pl/articles/22443175.pdf
Data publikacji:
2022
Wydawca:
Instytut Badań Gospodarczych
Tematy:
corruption
control of corruption
determinants
panel data analysis
Visegrad countires
Opis:
Research background: Corruption is a phenomenon that has no borders, thus hindering the proper functioning of the social, economic, and legal systems of a given state. As the rankings assessing the level of corruption in various countries show, transition economies are more vulnerable to corruption than countries that have not undergone changes in the political and economic order. The Visegrad group is an example of such countries. Despite their efforts, these countries? governments have yet to match the evaluation of corruption indices for developed European countries. Purpose of the article: This study analyses the determinants of corruption in Visegrad countries to identify which determinants are the most impactful and thus should be the focus of Visegrad countries?governments when creating anti-corruption policies. Methods: Data for the period 1996?2019 from the databases of the World Bank, Transparency International, and the European Central Bank were used for panel data analysis. The study uses a comprehensive set of economic, socio-cultural, and political determinants that can influence corruption. The purpose of this large set of variables is to prevent possible distortion owing to omitted variables. Findings & value added: The results of the analysis of panel data show the main determinants of corruption in Visegrad countries are economic, political, and socio-cultural (phase of economic development, openness of the economy, size of the public sector, degree of urbanization, and women's share in the labour force). A significant effect was also demonstrated in the case of regulatory quality and public sector wages. The findings can serve as a valuable resource for policymakers to develop government policies in individual countries and to implement effective anti-corruption tools.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 1; 51-79
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature extraction of molten pool for laser welding quality real-time inspection
Autorzy:
Zhang, J
Yin, H
Huang, H
Yang, R
Yang, J
Li, Y
Powiązania:
https://bibliotekanauki.pl/articles/173597.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
laser materials processing
process monitoring and control
image analysis
Opis:
This paper proposed an image feature extraction method for laser welding molten pool inspection based on cellular neural network. TC4 titanium alloy thin plates were welded by Nd:YAG pulsed laser. A coaxial machine vision system was designed to acquire molten pool images. An auxiliary lighting source was employed to improve the molten pool image quality. By analyzing molten pool images, the welding defects such as fenestration or insufficient depth were identified. These results can be used as a feedback signal for laser power control. Experimental results showed that the proposed method can be used to improve laser welding quality.
Źródło:
Optica Applicata; 2015, 45, 4; 523-533
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The sensitivity of state differential game vessel traffic model
Autorzy:
Lisowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/259067.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine transport
safety of navigation
game control
sensitivity analysis
Opis:
The paper presents the application of the theory of deterministic sensitivity control systems for sensitivity analysis implemented to game control systems of moving objects, such as ships, airplanes and cars. The sensitivity of parametric model of game ship control process in collision situations have been presented. First-order and k-th order sensitivity functions of parametric model of process control are described. The structure of the game ship control system in collision situations and the mathematical model of game control process in the form of state equations, are given. Characteristics of sensitivity functions of the game ship control process model on the basis of computer simulation in Matlab/Simulink software have been presented. In the end , have been given proposals regarding the use of sensitivity analysis to practical synthesis of computer-aided system navigator in potential collision situations.
Źródło:
Polish Maritime Research; 2016, 2; 14-18
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Access control system for RFID-tagged documents in supply chain management
Autorzy:
Nowicki, T.
Kiedrowicz, M.
Waszkowski, R.
Chodowska, A.
Lach, A.
Powiązania:
https://bibliotekanauki.pl/articles/409110.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
modeling
business process management
business analysis
RFID
access control
Opis:
The paper presents the concept and design models of the access control system for RFID tagged documents in supply chain management. The access control system allows to assign privileges to particular persons or groups of persons for specific documents. When implementing the processes related to the handling of documents, the required privileges are verified. Existence or lack of such privileges affects further development of such processes.
Źródło:
Research in Logistics & Production; 2017, 7, 2; 143-157
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and robustness analysis of discrete-time fractional-piecewise-constant-order PID controller
Autorzy:
Oziablo, Piotr
Mozyrska, Dorota
Wyrwas, Malgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2086870.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stability analysis
fractional calculus
control systems
digital control
analiza stabilności
rachunek ułamkowy
systemy kontrolne
sterowanie cyfrowe
Opis:
In the paper we propose a fractional-piecewise-constant-order PID controller and discuss the stability and robustness of a closed loop system. In stability analysis we use the transform method and include the Nyquist-like criteria. Simulations for designed controllers are performed for the second-order plant with a delay.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137937, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza stanu technicznego pojazdów samochodowych podlegających kontrolnym badaniom technicznym na Stacjach Kontroli Pojazdów w rejonie podlaskim
Analysis of technical conditions of cars examined during control technical tests in the "Car Control Center" in the Podlachia area
Autorzy:
Wituszyński, K.
Jakubowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/263188.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
analiza
badania kontrolne
stacja kontroli pojazdów
stan techniczny
analysis
Car Control Center
control technical tests
technical conditions
Opis:
W artykule dokonano wstępnej analizy wyników badań kontrolnych stanu technicznego samochodów eksploatowanych w rejonie podlaskim na podstawie 546 badań technicznych pojazdów. Sformułowano wnioski o stanie technicznym pojazdów i jakości ich eksploatacji oraz porównano z analogicznymi wynikami badań przeprowadzanych przez Stacje Kontroli Pojazdów Dekry i TUV w Niemczech.
The paper presents a preliminary analysis of results achieved during technical control tests of 546 cars from Podlachia area. Conclusions concerning cars technical conditions and quality of its exploitation, as well as comparison with analogous results obtained by German Automobile Associations Dekra and TUV were made.
Źródło:
Archiwum Motoryzacji; 2008, 1; 19-32
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of softly switched multiregional dynamic output controllers with a static antiwindup filter: a discrete-time case
Autorzy:
Zubowicz, T.
Brdyś, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/911226.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Lyapunov
stability
analysis
fuzzy control
antiwindup
stateczność
sterowanie rozmyte
stabilność Lyapunova
Opis:
This paper addresses the problem of model-based global stability analysis of discrete-time Takagi–Sugeno multiregional dynamic output controllers with static antiwindup filters. The presented analyses are reduced to the problem of a feasibility study of the Linear Matrix Inequalities (LMIs), derived based on Lyapunov stability theory. Two sets of LMIs are considered candidate derived from the classical common quadratic Lyapunov function, which may in some cases be too conservative, and a fuzzy Lyapunov function candidate, which has been proven to significantly reduce the conservatism level, although at the cost of increasing the number of LMIs. Two numerical examples illustrate the main result.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 1; 65-73
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of time delay on fractional-order PI-controlled system for a second-order oscillatory plant model with time delay
Autorzy:
Sadalla, T.
Horla, D.
Giernacki, W.
Kozierski, P.
Powiązania:
https://bibliotekanauki.pl/articles/140432.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional-order control
FOPI controller
stability analysis
time delay
tracking
Opis:
The paper aims at presenting the influence of an open-loop time delay on the stability and tracking performance of a second-order open-loop system and continuoustime fractional-order PI controller. The tuning method of this controller is based on Hermite- Biehler and Pontryagin theorems, and the tracking performance is evaluated on the basis of two integral performance indices, namely IAE and ISE. The paper extends the results and methodology presented in previous work of the authors to analysis of the influence of time delay on the closed-loop system taking its destabilizing properties into account, as well as concerning possible application of the presented results and used models.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 693-704
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of inverter PWM speed control methods on the operation of a BLDC motor
Autorzy:
Ciurys, M. P.
Powiązania:
https://bibliotekanauki.pl/articles/140544.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analysis
brushless DC motors
electrical machines
PWM speed control
measurements
Opis:
An analysis of the influence of inverter PWM speed control methods on the operation of a brushless DC (BLDC) motor was carried out. Field-circuit models of the BLDC motor were developed taking into account rotational speed control by two classic methods: the unipolar H_ON_L_PWM and the bipolar H_PWM_L_PWM. Waveforms of the electrical and mechanical quantities and the motor parameters were computed. The results of the computations were verified by measurements performed on a specially designed test stand. On the basis of the measuredwaveforms of the electrical and mechanical quantities the dependence of the drive system efficiencies and power losses on rotational speed was determined for the two methods of inverter control.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 939-953
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical analysis and modeling of SIP traffic for parameter estimation of server hysteretic overload control
Autorzy:
Abaev, P.
Razumchik, R.
Uglov, I.
Powiązania:
https://bibliotekanauki.pl/articles/308261.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Markov Modulated Poisson Process
overload control
SIP server
statistical analysis
Opis:
The problem of overload control in Session Initiation Protocol (SIP) signaling networks gives rise to many questions which attract researchers from theoretical and practical point of view. Any mechanism that is claimed to settle this problem down demands estimation of local (control) parameters on which its performance is greatly dependent. In hysteretic mechanism these parameters are those which define hysteretic loops. In order to find appropriate values for parameters one needs adequate model of SIP traffic flow circulating in the network under consideration. In this paper the attempt is made to address this issue. Analysis of SIP traffic collected from telecommunication operator’s network is presented. Traffic profile is built. It is shown that fitting with Markov Modulated Poisson Process with more than 2 phases is accurate. Estimated values of its parameters are given.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 4; 22-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis and Systems Theory
Autorzy:
Campbell, S. L.
Powiązania:
https://bibliotekanauki.pl/articles/908059.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza numeryczna
sterowanie
teoria systemów
numerical analysis
control
systems theory
Opis:
The area of numerical analysis interacts with the area of control and systems theory in a number of ways, some of which are widely recognized and some of which are not fully appreciated or understood. This paper will briefly discuss some of these areas of interaction and place the papers in this volume in context.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 5; 1025-1033
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A thermo-hydraulic tool for automatic virtual hazop evaluation
Autorzy:
Pugi, L.
Conti, R.
Rindi, A.
Rossin, S.
Powiązania:
https://bibliotekanauki.pl/articles/220567.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RT code prototyping
lube oil console
rotating machine HazOp analysis
transient behaviour analysis
Plant-Control System interaction
Opis:
Development of complex lubrication systems in the Oil&Gas industry has reached high levels of competitiveness in terms of requested performances and reliability. In particular, the use of HazOp (acronym of Hazard and Operability) analysis represents a decisive factor to evaluate safety and reliability of plants. The HazOp analysis is a structured and systematic examination of a planned or existing operation in order to identify and evaluate problems that may represent risks to personnel or equipment. In particular, P&ID schemes (acronym of Piping and Instrument Diagram according to regulation in force ISO 14617) are used to evaluate the design of the plant in order to increase its safety and reliability in different operating conditions. The use of a simulation tool can drastically increase speed, efficiency and reliability of the design process. In this work, a tool, called TTH lib (acronym of Transient Thermal Hydraulic Library) for the 1-D simulation of thermal hydraulic plants is presented. The proposed tool is applied to the analysis of safety relevant components of compressor and pumping units, such as lubrication circuits. Opposed to the known commercial products, TTH lib has been customized in order to ease simulation of complex interactions with digital logic components and plant controllers including their sensors and measurement systems. In particular, the proposed tool is optimized for fixed step execution and fast prototyping of Real Time code both for testing and production purposes. TTH lib can be used as a standard SimScape-Simulink library of components optimized and specifically designed in accordance with the P&ID definitions. Finally, an automatic code generation procedure has been developed, so TTH simulation models can be directly assembled from the P&ID schemes and technical documentation including detailed informations of sensor and measurement system.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 631-648
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operation Risk Management of Planning and Piping Design in a Large Petrochemical Plant Project
Autorzy:
Deeswasmongkol, Kamolwan
Sachakamol, Punnamee
Powiązania:
https://bibliotekanauki.pl/articles/633727.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
failure mode and effects analysis
piping design and drawing process
control plan
Opis:
Purpose – The purpose of this paper is to present practical and research lessons learned from analysis and the identification of failures which can occur. Failure mode and effects piping analysis (FMEPA) has been shown to be an effective way of improving piping design reliability. FMEPA is also employed for making sample control plans. Design/methodology/approach – To reduce project losses by using failure mode and effects piping analysis as a tool for analysis of the piping design department. The samples were selected from five projects. It was found that nine major points yielded a risk priority number (RPN) higher than 125. Findings – Results of RPN calculation concerning four topics revealed that the RPN value was reduced from 211 to 75, demonstrating a 64.4 percent improvement. Research limitations/implications – The study is limited to a planning and piping case study which considers RPN. Testing of the performance network regression model can be employed in companies, in which quality control has been implemented of solutions for failure prevention of piping design. Practical implications – This paper serves practitioners as a guideline and tool to understand and implement the FMEPA methodology. At this level, management sets the limits for determining measures. Management also decides whether a risk is acceptable or not. Management needs to clarify which risk priority number (RPN) represents the critical level above which requires risk reduction. Social implications – Conflicts and social unrest can cause costly delays to new projects and operations. Conflicts can also result in damage to a company’s reputation. This depends on the company’s responses to the conflict and the consequences or perceived consequences of its behavior and actions. Originality/value – This paper furnishes lessons learned for practitioners in various industrial sectors in preference to other methods of risk assessment and control activities.
Źródło:
International Journal of Synergy and Research; 2014, 3
2083-0025
Pojawia się w:
International Journal of Synergy and Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity analysis for optimal control of problems governed by semilinear parabolic equations
Autorzy:
Bergounioux, M.
Merabet, N.
Powiązania:
https://bibliotekanauki.pl/articles/206854.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
analiza czułości
sterowanie optymalne
optimal control
second order optimality conditions
sensitivity analysis
Opis:
We investigate an optimal control problem governed by a semilinear parabolic equation with perturbed initial data. We perform some sensitivity analysis: under polyhedricity assumption and second order optimality conditions we derive second order expansion of the optimal value function.
Źródło:
Control and Cybernetics; 2000, 29, 4; 861-886
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concrete surface evaluation based on the reflected TLS laser beam’s intensity image classification
Autorzy:
Zaczek-Peplinska, J.
Osińska-Skotak, K.
Powiązania:
https://bibliotekanauki.pl/articles/178269.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
engineering geodesy
Automatic Image Analysis
control of dams
assesment of concrete surface
Opis:
Dynamically developing terrestrial laser scanning technology (TLS) provides modern surveying tools, that is, scanning total stations and laser scanners. Owing to these instruments, periodic control surveys of concrete dams were performed as a part of geodetic monitoring yield point models characterised by quasicontinuity. Using the results of such measurements as a base, one can carry out a number of geometric analyses as well as acquire information for detailed analytical and calculative considerations. The scanner, similar to total station, by determining distances and angles, identifies spatial coordinates (X, Y, Z) of the surveyed points. Registration of the reflected laser beam’s intensity value (Intensity) emitted by the scanner provides additional information on the surveyed object. Owing to high working speed and the large amount of the collected data, the scanners became an indispensable tool for geodesists. The article assesses the possibility of application of terrestrial laser scanning in surveying changes in the surface of a concrete dam based on the experimental measurements. The condition of the dam’s downstream concrete wall was evaluated. The evaluation included changes in the surface’s roughness, cracks, seepage points, erosion caused by plant overgrowth and the degressive durability parameter of the used material (concrete). The article presents an example of the application of the results of a laser scan in the assessment of the condition of a water dam’s external concrete surfaces. The results of experimental measurements were analysed – the results of a scan of the downstream concrete wall of a dam in Ecker (Germany) using two laser scanners characterised by different technical parameters, that is, laser wavelength (laser’s colour), range, definable point density, method of distance measurement – Leica C10, Z+F Imager 5006h. The measurement was carried out in the same weather conditions from the same sites of the test base. The results of the measurements were analysed using, inter alia, statistical methods by defining template fields and supervised and unsupervised classification methods in reference to the selected fragments of the Surface characterised by known concrete surface properties. Various classification algorithms were used. The obtained results make it possible to assess the suitability of the proposed methodology of evaluating the concreto surface’s condition and establish tool selection principles to match the practical application requirements.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 1; 56-64
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditioning and error estimates in LQG design
Autorzy:
Petkov, P. Hr.
Konstantinov, M. M.
Christov, N. D.
Powiązania:
https://bibliotekanauki.pl/articles/971012.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
LQG control
Riccati equations
perturbation analysis
condition numbers
forward error estimation
Opis:
Efficient conditioning and error estimates are presented for the numerical solution of matrix Riccati equations in the continuous-time and discrete-time LQG design. The estimates implemented involve the solution of triangular Lyapunov equations along with usage of the LAPACK norm estimator.
Źródło:
Control and Cybernetics; 2008, 37, 1; 85-87
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of the game control of ship in collision situations
Autorzy:
Lisowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/258832.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine transport
safety of navigation
game control
sensitivity analysis
computer simulation
Opis:
The paper introduces the application of the theory of deterministic sensitivity control systems for sensitivity analysis taking place in game control systems of moving objects, such as ships. The sensitivity of parametric model of game ship control process and game control in collision situations - sensitivity to changes in its parameters have been presented. First-order and k-th order sensitivity functions of parametric model of the process and game control are described. The structure of the game ship control system in collision situations and the mathematical model of game control process in the form of state equations are given. Characteristics of sensitivity functions of the model and game ship control process on the base of computer simulation in Matlab/Simulink software have been presented. At the end are given proposals regarding the use of sensitivity analysis to practical synthesis of computer-aided system navigator in potential collision situations.
Źródło:
Polish Maritime Research; 2015, 4; 27-33
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological discrimination of granular materials by measurement of pixel intensity distribution (PID)
Autorzy:
Wójcik, Artur
Kościelniak, Piotr
Mazur, Marcin
Mathia, Thomas G.
Powiązania:
https://bibliotekanauki.pl/articles/221800.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
granular material
digital image analysis
pixel intensity distribution
discrimination process control
Opis:
The paper provides statistical analysis of the photographs of four various granular materials (peas, pellets, triticale, wood chips). For analysis, the (parametric) ANOVA and the (nonparametric) Kruskal-Wallis tests were applied. Additionally, the (parametric) two-sample t-test and (non-parametric) Wilcoxon Rank-Sum Test for pairwise comparisons were performed. In each case, the Bonferroni correction was used. The analysis shows a statistical evidence of the presence of differences between the respective average discrete pixel intensity distributions (PID), induced by the histograms in each group of photos, which cannot be explained only by the existing differences among single granules of different materials. The proposed approach may contribute to the development of a fast inspection method for comparison and discrimination of granular materials differing from the reference material, in the production process.
Źródło:
Metrology and Measurement Systems; 2019, 26, 2; 297-308
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic control for gas pipeline systems
Optymalne sterowanie siecią gazową
Autorzy:
Osiadacz, A.
Chaczykowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/219352.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sterowanie przepływem
wielkie systemy
sieci
optymalne sterowanie
stan nieustalony
flow control
large scale systems
networks
optimal control
transient analysis
Opis:
An algorithm for optimal control of a gas network with any configuration based upon hierarchical control and decomposition of the network is described. Local problems are solved using a gradient technique. The subsystems are coordinated using „good coordination” method to find the overall optimum. Discrete state equation for the case in which output pressures are treated as elements of the control vector has been formulated. Results of investigations are included.
W artykule omówiono algorytm optymalnego sterowania siecią gazową o dowolnej konfiguracji wykorzystujący teorię systemów hierarchicznych oraz zasady dekompozycji systemu na podsystemy. Lokalne problemy optymalizacji są rozwiązywane stosując metodę gradientową. Koordynacja rozwiązań lokalnych pozwala na znalezienie rozwiązania optymalnego dla całego systemu. Optymalizowany system opisano za pomocą dyskretnego równania stanu przyjmując, że elementami wektora sterowania są wartości ciśnienia wyjściowego elementów nierurowych. W artykule przedstawiono rezultaty badań algorytmu.
Źródło:
Archives of Mining Sciences; 2016, 61, 1; 69-82
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards robust predictive fault-tolerant control for a battery assembly system
Autorzy:
Seybold, L.
Witczak, M.
Majdzik, P.
Stetter, R.
Powiązania:
https://bibliotekanauki.pl/articles/330359.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
max-plus algebra
interval analysis
battery assembly
model predictive control
fault tolerant control
analiza interwałowa
sterowanie predykcyjne
sterowanie tolerujące uszkodzenia
Opis:
The paper deals with the modeling and fault-tolerant control of a real battery assembly system which is under implementation at the RAFI GmbH company (one of the leading electronic manufacturing service providers in Germany). To model and control the battery assembly system, a unified max-plus algebra and model predictive control framework is introduced. Subsequently, the control strategy is enhanced with fault-tolerance features that increase the overall performance of the production system being considered. In particular, it enables tolerating (up to some degree) mobile robot, processing and transportation faults. The paper discusses also robustness issues, which are inevitable in real production systems. As a result, a novel robust predictive fault-tolerant strategy is developed that is applied to the battery assembly system. The last part of the paper shows illustrative examples, which clearly exhibit the performance of the proposed approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 849-862
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insider understanding of country development: a novel application of Optimal Control Theory and Data Envelopment Analysis for benchmarking performance of Chilean and Brazilian companies
Autorzy:
Alves Junior, Paulo Nocera
Yushimito, Wilfredo F.
Gude, Jorge Pereira
Melo, Isotilia Costa
Rebelatto, Daisy Aparecida do Nascimento
Powiązania:
https://bibliotekanauki.pl/articles/14430662.pdf
Data publikacji:
2019-03-27
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
Data Envelopment Analysis (DEA)
Optimal Control Theory (OCT)
Dynamic Efficiency
Developing Countries
Inventory Control
Production-Inventory System
Benchmarking
Best Practices.
Opis:
Aim: If companies manage their inventory inefficiently, inventory costs can increase significantly due to shortages, overstocking, and risks. Inventory management is critical for company’s success which, in turn, impacts on countries’ development. This paper aims to investigate the efficiency of inventory control systems of companies from Brazil and Chile through Optimal Control Theory and Data Envelopment Analysis. Design/Research methods: Data was collected from Chilean and Brazilian companies covering different industries in which both countries are mostly dependent A new approach using OCT and DEA is applied for dealing with inventory, production, and demand in Dynamic DEA model to benchmark companies’ production-inventory systems. Conclusions/findings: The results show efficient companies among evaluated industries. Such companies are related mainly to Brazilian commerce and Chilean exports. Based on findings, it was possible to identify patterns and relationship among companies and its inventory management. Originality/value of the article: This paper fills a gap in studies including demand, production, and inventory in Dynamic DEA by using OCT to forewarn unrealistic results and observing companies’ behavior. Besides that, this approach is particularly useful for developing countries in this context, determining benchmarks for the most inefficient firms in each sector. Implications of the research: The results show (1) which companies should focus more on improving inventory management, (2) which companies should be used as benchmarks, and (3) it highlights the reasons of different performance of companies in each country. Limitations of the research: For future research, it is suggested including variables and analysis of social and environmental impacts.
Źródło:
Central European Review of Economics and Management; 2019, 3, 1; 47-93
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and analysis of split-plot x split-block type experiments with control C treatments
Modelowanie i analiza doświadczeń typu split-plot x split-block z obiektami kontrolnymi w obrębie czynnika C
Autorzy:
Ambrozy, K.
Mejza, I.
Powiązania:
https://bibliotekanauki.pl/articles/9801.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
Tematy:
modelling
split-plot x split-block analysis
test treatment
control treatment
stratum efficiency
Źródło:
Colloquium Biometricum; 2009, 39
1896-7701
Pojawia się w:
Colloquium Biometricum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust H∞ output feedback control of bidirectional inductive power transfer systems
Autorzy:
Swain, A.
Almakhles, D.
Neath, M. J.
Nasiri, A.
Powiązania:
https://bibliotekanauki.pl/articles/230097.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inductive power transfer
wireless power transfer
robust control
linear matrix inequalities
sensitivity analysis
Opis:
Bidirectional Inductive power transfer (IPT) systems behave as high order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric uncertainties. To overcome these problems, this paper proposes a robust controller which is designed using linear matrix inequality (LMI) techniques. The output sensitivity to parametric uncertainty is explored and a linear fractional transformation of the nominal model and its uncertainty is discussed to generate a standard configuration for μ-synthesis and LMI analysis. An H∞ controller is designed based on the structured singular value and LMI feasibility analysis with regard to uncertainties in the primary tuning capacitance, the primary and pickup inductors and the mutual inductance. Robust stability and robust performance of the system is studied through μ-synthesis and LMI feasibility analysis. Simulations and experiments are conducted to verify the power regulation performance of the proposed controller.
Źródło:
Archives of Control Sciences; 2017, 27, 1; 41-62
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality management in manufacturing processes for serial production organization – case study
Autorzy:
Mazur, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/34670813.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
quality control
risk analysis
FMEA method
SPC
kontrola jakości
ocena ryzyka
metoda FMEA
Opis:
The basis for the control work for the quality in manufacturing process is the supervision of the effects of this process and the verification of the correctness of the employees' activities. The continuity of the control activities carried out indicates the need to supervise all production elements of the offered products. The article presents unit guidelines of quality analyzes for the production and assembly of car brake calipers. The presented analyzes constitute the basis of a complete supervision system and are an element repeated in each subsequent production batch. The quantitative analysis of production non-conformities was supplemented with the determination of the causes and effects for these errors, and the analysis of statistical indicators of qualitative ability. The results for one production batch were presented along with the adopted procedure, which are a component of the system of supervision over the results of control processes included in the production process.
Źródło:
Quality Production Improvement - QPI; 2021, 3, 1; 377-385
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protecting the environment through criminal law in Poland — the system of institutions
Autorzy:
Mądrzejowski, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/45448882.pdf
Data publikacji:
2023-08-23
Wydawca:
Akademia Policji w Szczytnie
Tematy:
environmental crimes
combating
distribution of tasks
coordination
control activities
information exchange
risk analysis
Opis:
In Poland there are over a dozen bodies engaged in protection of environment. The tasks in the field of combating environmental crime are carried out by several institutions with varied duties and control and investigative powers, including appearing before trial court. The system of law enforcement institutions engaged in environmental protection is undoubtedly dispersed. There is no agency legally entitled to coordinate or influence the activities undertaken by other institutions within the system. The main role here is undoubtedly played by Environmental Protection Inspectorate. It was tasked with both monitoring of compliance with the environmental protection regulations in a very wide scope, as well as independent conduct of certain operational activities and granted investigative powers. The role of the Environmental Protection Inspection will increase in the future, as evidenced by the establishment in 2021 of the Department for Combating Environmental Crimes at the Chief Inspectorate for Environmental Protection. So far, the vast majority of investigations concerning environmental crimes are conducted by the Police. There are, however, no specialised police units fighting environmental crimes and corresponding activities are carried out by departments combating economic crimes. Cases concerning organized forms of environmental crime are conducted by the Central Investigation Bureau of Police. No coherent strategy to combat environmental crime has been developed so far. Cooperation between various involved institutions is based on bilateral and multilateral agreements. An undertaking necessary to improve the effectiveness of combating environmental crimes is currently primarily the creation of common database of these crimes mechanisms and perpetrators, as well as creation of an analytical structure dealing with this issue,
Źródło:
Przegląd Policyjny; 2023, 150(2); 272-305
0867-5708
Pojawia się w:
Przegląd Policyjny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Ergonomic Risk Assessment Output in Four Sawmill Jobs
Autorzy:
Jones, T.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/90305.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
physical ergonomics
exposure assessment
musculoskeletal risk assessment
job analysis
prevention and control
Opis:
The objectives of this study were to examine the agreement between 5 ergonomic risk assessment methods calculated on the basis of quantitative exposure measures and to examine the ability of the methods to correctly classify 4 at risk jobs. Surface electromyography and electrogoniometry were used to record the physical exposures of 87 sawmill workers performing 4 repetitive jobs. Five ergonomic risk assessment tools (rapid upper limb assessment [RULA], rapid entire body assessment [REBA], American conference of governmental industrial hygienist’s threshold limit value for mono-task hand work [ACGIH TLV], strain index [SI], and concise exposure index [OCRA]) were calculated. Dichotomization of risk to no risk and at risk resulted in high agreement between methods. Percentage of perfect agreement between methods when 3 levels of risk were considered was moderate and varied by job. Of the methods examined, the RULA and SI were best (correct classification rates of 99 and 97% respectively). The quantitative ACGIH-TLV for mono-task hand work and Borg scale were worst (misclassification rates of 86 and 28% respectively).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 1; 105-111
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of electric field control methods for foil coils in high-voltage linear actuators
Autorzy:
Beek, T. A. van
Jansen, J. W.
Lomonova, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/141173.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric field control methods
high voltage
linear actuators sensitivity analysis
stress grading
Opis:
This paper describes multiple electric field control methods for foil coils in high-voltage coreless linear actuators and their sensitivity to misalignment. The investigated field control methods consist of resistive, refractive, capacitive and geometrical solutions for mitigating electric stress at edges and corners of foil coils. These field control methods are evaluated using 2-D boundary element and finite element methods. A comparison is presented between the field control methods and their ability to mitigate electric stress in coreless linear actuators. Furthermore, the sensitivity to misalignment of the field control methods is investigated.
Źródło:
Archives of Electrical Engineering; 2015, 64, 4; 629-640
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lagrange principle and necessary conditions
Autorzy:
Tikhomirov, V.
Powiązania:
https://bibliotekanauki.pl/articles/970737.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
mathematical programming
convex analysis
calculus of variations
optimal control
Lagrange multiplier rule
Opis:
Necessary conditions of extremum (from the times of Fermat and Lagrange till our times) for extremal problems where smoothness is interlaced with convexity, and some type of regularity takes place, correspond to a unique general principle, which is due to Lagrange. This report is devoted to the Lagrange principle in the theory of optimization.
Źródło:
Control and Cybernetics; 2009, 38, 4B; 1589-1605
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of fuzzy controll systems simplified as a discrete system
Autorzy:
Hasegawa, T.
Furuhashi, T.
Powiązania:
https://bibliotekanauki.pl/articles/206083.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
analiza stabilności
sieć Petriego
sterowanie rozmyte
fuzzy control
Petri net
stability analysis
Opis:
Fuzzy controls can describe control rules using fuzzy if-then rules and it can incorporate experts' control rules. It is, however, difficult to guarantee the stability of fuzzy control system. This paper presents a new method for stability analysis of fuzzy control system using petri nets. The proposed method crisply divides all of the input and output variables of the fuzzy controller and the fuzzy model of the controlled object. This crisp division makes the fired rules of the fuzzy controller and the fuzzy model, which have truth values greater then 0, be single each. These simplified fuzzy rules can be considered as discrete description of the controller and the controlled object. By approximating and the fuzzy control system as this discrete system, the system can be expressed by the petri nets. The proposed method describes the fuzzy control system using matrix based on a bipartite directed multigraph of the petri net, thereby enables to analyse the stability of the fuzzy control system. The analytic results using the petri nets have clear correspondence to the fired fuzzy rules. The dynamical behavior of the system are able to be understood easily. Simulation is done to verify the proposed stability analysis method.
Źródło:
Control and Cybernetics; 1998, 27, 4; 565-577
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of selecting the interval of functional tests taking into account economic aspects and legal requirements
Autorzy:
Piesik, Jan
Piesik, Emilian
Śliwiński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/385226.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
functional test
maintenance engineering
parameter
optimisation
safety analysis
time-schedule control
tires
Opis:
The article discusses the problem of choosing the optimal frequency of functional tests, taking into account the reliability and law requirements, but also the impact of business aspects in the company. The subject of functional test interval is well described for purposes of the process industry. Unfortunately, this is not the case for the machinery safety functions with low demand mode. This is followed by a presentation of the current business approach, which, in order to achieve industrial excellence, monitor their performance through the appropriate selection of key performance indicators. In addition, companies are increasingly exploring potential risks in the following areas: new challenges in advanced risk management, including the perception of the company’s facilities as a safe workplace insight of customers and business partners. Eliminating potential hazards is increasingly taking into account, especially the impact of human activity and its interaction with machines. The case study has been presented based on the machines used for the production of tire semi-finished products. In this article, the authors propose a solution for selecting the interval of functional tests of safety functions and additional machine protection measures as a compromise to achieve satisfactory results in terms of safety requirements, performance and legal requirements.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 91-98
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and transparency of delayed bilateral teleoperation with haptic feedback
Autorzy:
Estrada, Edgar
Yu, Wen
Li, Xiaoou
Powiązania:
https://bibliotekanauki.pl/articles/330892.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
bilateral teleoperation
force control
stability
transparency analysis
dwustronna teleoperacja
sterowanie siłą
transparentność
Opis:
Haptic guidance can improve control accuracy in bilateral teleoperation. With haptic sensing, the human operator feels that he grabs the robot on the remote side. There are results on the stability and transparency analysis of teleoperation without haptic guidance, and the analysis of teleoperation with haptic feedback is only for linear and zero time-delay systems. In this paper, we consider more general cases: the bilateral teleoperation systems have time-varying communication delays, the whole systems are nonlinear, and they have force feedback. By using the admittance human operator model, we propose a new control scheme with the interaction passivity of the teleoperator. The stability and transparency of the master-slave system are proven with the Lyapunov–Krasovskii method. Numerical simulations illustrate the efficiency of the proposed control methods.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 4; 681-692
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MIMO random control method for vibration testing
Rozwój systemów sterowania dla testów wibracyjnych MIMO
Autorzy:
Markiewicz, P.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/327566.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modal analysis
vibration control
environmental testing
analiza modalna
sterowanie wibracjami
test środowiskowy
Opis:
In following paper control algorithms used for MIMO vibration control were presented and investigated with regard to application in modal analysis. Implementation of existing control algorithms was presented for verification of its operation and development of new method combining several older methods. Objective of implementation of new method was increasing performance and quality of calculations and closer look in to development of SINE SWEEP and TIME WAVEFOR REPLICATION. Comparison of simulation and measurement data is presented in two cases of control with six degree of freedom system.
W artykule opisano istniejące metody sterowania MIMO, oraz ich zastosowanie w analizie modalnej. Przedstawiono implementację istniejących algorytmów sterowania do testów wibracyjnych MIMO celem weryfikacji ich działania oraz połączenia ich w nową metodę sterowania. Celem utworzenia nowej metody sterowania było zwiększenie wydajności i jakości obliczeń a także spojrzenie w kierunku dalszego rozwoju sterowania do metod SINE SWEEP oraz TIME WAVEFORM REPLICATION. Porównanie wyników symulacji oraz danych pomiarowych zaprezentowane jest na dwóch przykładach kontroli systemu o sześciu stopniach swobody.
Źródło:
Diagnostyka; 2013, 14, 2; 3-10
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A spatial study on Keshan disease prevalence and selenoprotein P in the Heilongjiang Province, China
Autorzy:
Wang, Yanan
Zhang, Xiao
Wang, Tong
Hou, Jie
Guo, Zhongying
Han, Xiaomin
Zhou, Huihui
Liang, Hong
Xing, Zhifeng
Powiązania:
https://bibliotekanauki.pl/articles/2095499.pdf
Data publikacji:
2021-09-03
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
prevalence
biomarker
prevention and control
endemic cardiomyopathy
selenoprotein P
spatial regression analysis
Opis:
ObjectivesFew spatial studies on Keshan disease (KD) prevalence and serum selenoprotein P (SELENOP) levels have been reported in the Heilongjiang Province, China. This study aimed to investigate the spatial relationships between KD prevalence, SELENOP levels, and the socio-economic status for the precise prevention and control of KD.Material and MethodsThe study was carried out in all the 66 KD endemic counties in the Heilongjiang Province using a non-probability sampling method of a key village survey based on county-wide case-searching. The participants completed a questionnaire and had their serum SELENOP levels measured using enzyme-linked immunosorbent assay. Thematic maps were created, and spatial regression analysis was performed by ordinary least squares using ArcGIS 9.0.ResultsOverall, 53 676 residents were surveyed based on case-searching, and blood samples were collected from 409 residents. In total, 50 chronic KD cases were identified with a total prevalence of 9.3/10 000 population. The prevalence in the Tangyuan County was the highest (250/10 000 population). The mean serum SELENOP level was 13.96 mg/l. The spatial regression analysis showed that KD prevalence positively correlated with SELENOP levels and negatively with per capita disposable income among rural residents.ConclusionsThe Tangyuan County should be considered for the precise prevention and control of KD. Further research is necessary to verify the reliability of SELENOP for estimating body selenium levels, and to better understand the relationship between selenium intake and KD in the investigated area.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2021, 34, 5; 659-666
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Reliability of Measurement Data and Adequacy of the Measurement Systems in Improving Quality of Casting Products
Autorzy:
Fedoryszyn, A.
Brzeziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/380770.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality control
cast quality
measurement system analysis
repeatability analysis
reproducibility analysis
kontrola jakości
jakość odlewu
analiza systemu pomiarowego
analiza powtarzalności
analiza odtwarzalności
Opis:
The study summarises the analysis of reliability assessment of measurements of a selected critical property of a high-precision casting product. Measurement data must be sufficiently reliable to be used in decision-making relating to quality control and the selection of the casting manufacturing technology. The applied procedure is illustrated by study of the variability range of readouts depending on the measurement conditions, obtained by the computer methods. The applied R&R (Repeatability and Reproducibility) procedure is major component of the widely employed Measurement System Analysis (MSA).
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 124-126
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolated word descriptors as control parameters of the computer applications
Autorzy:
Porwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/333588.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
analiza mowy
sterowanie głosem
osoby niepełnosprawne
speech analysis
voice control
persons disability
MSAA technology
Opis:
This paper is an extended version of the MIT'06 conference contribution. During the conference, many inquiries about the used techniques were performed. Hence, in the paper some parts of investigations were explained and discussed, with greater accuracy. It is shown that the computer applications can be controlled by a human voice. The computer controlling processes are available by means of utterance of isolated words, where application events with the aid of user's voice can be serviced. The voice usage can be convenient for blind or partially sighted users or for persons with limb paresis. The Microsoft application events, by means of the practicable Microsoft Windows firmware MSAA® technology can be analysed. Such technology, together with isolated word descriptors, as voice recognition system, has been presented.
Źródło:
Journal of Medical Informatics & Technologies; 2006, 10; 35-46
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical loss analysis in a compressor cascade with leading edge tubercles
Autorzy:
Zheng, T.
Qiang, X.-Q.
Teng, J.-F.
Teng, J.-Z.
Powiązania:
https://bibliotekanauki.pl/articles/280966.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
compressor cascade
flow separation
passive flow control
leading edge tubercles
streamwise vortices
loss analysis
Opis:
A numerical analysis of loss has been carried out to explore the loss mechanism of leading edge tubercles in a high speed compressor cascade. Taking the lead from flippers of the humpback whale, tubercles are passive structures of a blade for flow control. Evaluation of the overall performance in terms of entropy increase shows that the loss reduction is achieved both at high negative and high positive incidence angles, while a rise in the loss is obtained near the design point. And a smaller wave number as well as a smaller amplitude results in lower additional losses at the design point. Spanwise and streamwise distributions of pitchwise-averaged entropy increase combined with flow details have been presented to survey the loss development and, subsequently, to interpret the loss mechanism. The tubercle geometry results in the deflection flow and the consequent spanwise pressure gradient. This pressure gradient induces formation of counter-rotating streamwise vortices, transports away the low-momentum fluid near wall from crests towards troughs and leads to local high loss regions behind troughs as well as loss reduction behind the crests in comparison to the baseline. The interaction between these vortices and flow separation by momentum transfer leads to separation delay and the consequent loss reduction at the outlet.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1083-1095
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A characterization of stability and sensitivity properties for state-constrained optimal control
Autorzy:
Malanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/970245.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
optimal control
nonlinear ODEs
state constraints
parametric problems
stability and sensitivity analysis
Opis:
In a series of the recent papers of the author, it was shown that the solutions and Lagrange multipliers of state-constrained optimal control problems are locally Lipschitz continuous and directionally differentiable functions of the parameter, under usual constraint qualifications and weakened second order conditions. In this paper, it is shown that those conditions are not only sufficient, but also necessary. Thus, they consitute a characterization of Lipschitz stability and sensitivity properties for state-constrained optimal control problems.
Źródło:
Control and Cybernetics; 2007, 36, 3; 711-726
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On use of acoustic emission in monitoring of under and over abrasion during a water jet milling process
Autorzy:
Mikler, J.
Powiązania:
https://bibliotekanauki.pl/articles/100049.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
water jet abrasive milling
acoustic emission
signal analysis
water jet abrasive process control
Opis:
Water jet milling process is a new emerging technology with many interesting applications. Low cutting forces, no thermal distortion, process flexibility and ability to machine difficult to cut materials make it very attractive for many technological operations. However, its wider application is hindered by lack of proper solutions of process monitoring that would allow accurate control of the material removal process. The research contributions so far focused on use of acoustic emission, thus the purpose of this paper is an evaluation of the proposed strategies and analysis of applicability of acoustic emission for this purpose. An extensive amount of AE data was collected during waterjet machining with various feed rates, abrasive flows, and pump pressures, and analyzed with the aim to determine whether there exists any feature of the AE signal correlated with under- and over abrasion. Monitoring and control of removal rate is possible only if it is possible to discriminate between AE signal samples originating from different states of the abrasive process. In this paper I present results based on extensive one-way ANOVA study of the AE samples, showing, that the standard AE signal features proposed in the literature the energy and statistics of the AE signal do not allow such discrimination, and are not suitable to monitor abnormalities of the abrasive process. The research covers also principle component analysis of the AE signal energy performed in the aim to study if there exists any subset of the energy allowing better discrimination between the investigated process states.
Źródło:
Journal of Machine Engineering; 2014, 14, 2; 104-115
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity analysis for state constrained optimal control problems
Autorzy:
Malanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/206110.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sensitivity analysis
cone-constrained optimization problems
nonlinear optimal control
first order state constraints
Opis:
A sensitivity result for cone-constrained optimization problem in abstract Hilbert spaces is obtained, using a slight modification of Haraux's theorem on differentiability of the metric projection onto polyhedric sets. This result is applied to sensitivity analysis for nonlinear optimal control problems subject to first order state constraints.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1043-1058
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metrological Analysis of Precision of the System of Delivering a Water Capsule for Explosive Production of Water Aerosol
Autorzy:
Śmigielski, G.
Toczek, W.
Dygdała, R.
Stefański, K.
Powiązania:
https://bibliotekanauki.pl/articles/221553.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
water capsule airdrop control system
uncertainty analysis
GUM uncertainty framework
propagation of distributions
Opis:
In this paper precision of the system controlling delivery by a helicopter of a water capsule designed for extinguishing large scale fires is analysed. The analysis was performed using a numerical method of distribution propagation (the Monte Carlo method) supplemented with results of application of the uncertainty propagation method. In addition, the optimum conditions for the airdrop are determined to ensure achieving the maximum area covered by the water capsule with simultaneous preserving the precision level necessary for efficient fire extinguishing.
Źródło:
Metrology and Measurement Systems; 2016, 23, 1; 47-58
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health-aware and fault-tolerant control of an octorotor UAV system based on actuator reliability
Autorzy:
Salazar, Jean Carlo
Sanjuan, Adrián
Nejjari, Fatiha
Sarrate, Ramon
Powiązania:
https://bibliotekanauki.pl/articles/329705.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prognostics and health management
health aware control
fault-tolerant control
reliability analysis
octorotor
UAV system
zarządzanie zdrowiem
sterowanie tolerujące uszkodzenia
analiza niezawodności
Opis:
A major goal in modern flight control systems is the need for improving reliability. This work presents a health-aware and fault-tolerant control approach for an octorotor UAV that allows distributing the control effort among the available actuators based on their health information. However, it is worth mentioning that, in the case of actuator fault occurrence, a reliability improvement can come into conflict with UAV controllability. Therefore, system reliability sensitivity is redefined and modified to prevent uncontrollable situations during the UAV’s mission. The priority given to each actuator is related to its importance in system reliability. Moreover, the proposed approach can reconfigure the controller to compensate actuator faults and improve the overall system reliability or delay maintenance tasks.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 47-59
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dense 3D Structure and Motion Estimation as an Aid for Robot Navigation
Autorzy:
De Cubber, G.
Powiązania:
https://bibliotekanauki.pl/articles/384899.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
outdoor mobile robots
behavior-based control
stereo vision and image motion analysis for robot navigation
modular control and software architecture (MCA)
Opis:
Three-dimensional scene reconstruction is an important tool in many applications varying from computer graphics to mobile robot navigation. In this paper, we focus on the robotics application, where the goal is to estimate the 3D rigid motion of a mobile robot and to reconstruct a dense three-dimensional scene representation. The reconstruction problem can be subdivided into a number of subproblems. First, the egomotion has to be estimated. For this, the camera (or robot) motion parameters are iteratively estimated by reconstruction of the epipolar geometry. Secondly, a dense depth map is calculated by fusing sparse depth information from point features and dense motion information from the optical flow in a variational framework. This depth map corresponds to a point cloud in 3D space, which can then be converted into a model to extract information for the robot navigation algorithm. Here, we present an integrated approach for the structure and egomotion estimation problem.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 4; 14-18
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of influence of input quantities and disturbances on generator operation of doubly fed machine
Analiza wpływu wymuszeń i zakłóceń na pracę generatorową maszyny dwustronnie zasilanej
Autorzy:
Popenda, A.
Powiązania:
https://bibliotekanauki.pl/articles/158829.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
maszyna dwustronnie zasilana
transmitacje operatorowe
doubly fed machine
control system
operational calculus
transient responses analysis
Opis:
The control strategy for a DFM-based generator developed by the author as well as examples of time-dependencies measured with the application of laboratory stand are presented in the paper. The differential equations and flux-current dependencies describing current controlled DFM as well as the Laplace transformation of the equations are also given. The operational transmittances of DFM for input quantities and disturbances are defined. The transient responses of DFM are determined on the basis of the defined operational transmittances. A delta function and a step function are taken into consideration as input functions. The derived operational transmittances of DFM allow for penetrating analysis of controlled structure and formulating the detailed conclusions.
W pracy zaprezentowano opracowaną przez autora strategię sterowania pracą generatorową maszyny dwustronnie zasilanej (MDZ). Zaprezentowano przy tym przebiegi czasowe zmierzone na stanowisku laboratoryjnym. Podano równania różniczkowe oraz zależności strumieniowo-prądowe opisujące MDZ sterowaną prądowo, jak również przekształcenie Laplace'a przedstawionych równań. Zdefiniowano transmitancje operatorowe dla wielkości wymuszających i zakłóceń. Określono odpowiedzi czasowe MDZ na wymuszenia w postaci delty Diraca i skoku jednostkowego na podstawie zdefiniowanych transmitancji operatorowych. Wyprowadzone transmitancje operatorowe pozwoliły na wnikliwą analizę struktury sterowania oraz sformułowanie szczegółowych wniosków.
Źródło:
Prace Instytutu Elektrotechniki; 2011, 253; 27-38
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of industrial PROFINET in the task of controlling a dynamic system
Analiza pracy przemysłowej sieci PROFINET w zadaniu sterowania układem dynamicznym
Autorzy:
Rosół, M.
Knapik, D.
Marchewka, D.
Kołek, K.
Turnau, A.
Powiązania:
https://bibliotekanauki.pl/articles/282176.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
PROFINET network
real-time control
jitter analysis
sieć PROFINET
sterowanie w czasie rzeczywistym
analiza jitteringu
Opis:
This paper analyses the behaviour of industrial network PROFINET for time determinism during the transfer of controls and measurements in real time. The subject of interest is the performance of the network control system. An experimentation platform is described. An analysis of jitter in sampling period is provided. Test results demonstrating advantages of communication using PROFINET standard are presented.
W pracy analizowano zachowanie się przemysłowej sieci PROFINET pod kątem determinizmu czasowego przy przesyłaniu sterowań i pomiarów w czasie rzeczywistym. Przedmiotem zainteresowania jest wydajność sieciowego systemu sterowania. Zostało opisane użyte środowisko testowe. Zamieszono analizę odchyłek czasowych (jitter) w cyklicznej wymianie danych. Przedstawione zostały wyniki eksperymentów obrazujące zalety wykorzystania standardu PROFINET.
Źródło:
Automatyka / Automatics; 2013, 17, 1; 65-72
1429-3447
2353-0952
Pojawia się w:
Automatyka / Automatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Faster health deterioration among nail technicians occupationally exposed to low levels of volatile organic compounds
Autorzy:
Grešner, Peter
Świercz, Radosław
Wąsowicz, Wojciech
Gromadzińska, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/2167475.pdf
Data publikacji:
2017-05-08
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
occupational exposure
volatile organic compounds
survival analysis
case-control study
adverse health effects
nail technicians
Opis:
Objectives The study has aimed at investigating the subjective assessment of an individual’s health status and comparing the prevalence of selected work-related symptoms among nail technicians occupationally exposed to volatile organic compounds (VOCs) to the one among control subjects. Associations between occupational exposure to VOCs and the incidence of adverse health effects were also analyzed. Material and Methods The study involved 145 female nail technicians and 152 control subjects. Data on the prevalence of adverse health effects was collected using the researcher- made questionnaire and then analyzed by means of survival analysis methods. Results Only 22% of nail technicians as compared to 45% of control subjects described their current health status as “excellent” or “very good” (odds ratio (OR) = 0.4, 95% confidence interval (CI): 0.2–0.6, p < 0.00005). In general, 61% of nail technicians confirmed to have experienced any out of all symptoms considered in the study since the commencement of the job, which was significantly higher as compared to 17% of control subjects (adjusted OR = 2.8, 95% CI: 2.1–3.7, p < 0.0001). Estimated median length of the employment period free of investigated symptoms was significantly shorter among nail technicians as compared to controls (12 years vs. 33 years, p < 0.0001), consistent with almost 4-times increased hazard of the occurrence of such symptoms among the technicians (hazard ratio (HR) = 3.9, 95% CI: 2.7–5.7, p < 0.0001). Cox proportional hazard regression modeling revealed almost 5-times increased hazard of the occurrence of any symptoms among nail technicians exposed to higher levels of the mixture of VOCs as compared to those exposed to lower levels (HR = 4.9, 95% CI: 1–24.1, p = 0.05). Conclusions All outcomes combined together indicate that nail technicians are subject to faster health deterioration, which may be assumed to be caused by occupational exposure to low levels of VOCs. Int J Occup Med Environ Health 2017;30(3):469–483
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 3; 469-483
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Płatni mordercy”? Dyskurs budowania tożsamości zawodowej wśród pracowników deratyzacji
“Hitmen”? The Discourse of Developing the Professional Identity Among Rat Exterminators
Autorzy:
Jarzębowska, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/1371524.pdf
Data publikacji:
2020-12-16
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
szczury
deratyzacja
tożsamość zawodowa
analiza dyskursu
etyka
rats
pest control
professional identity
discourse analysis
ethics
Opis:
Niniejszy artykuł analizuje praktyki dyskursywne kształtujące tożsamość zawodową deratyzatorów (tępicieli gryzoni). Wywiady z pracownikami tej branży ukazują retorykę wytężonej pracy nad tożsamością. Stawiam tezę, że budowanie owej tożsamości lokuje się na dwóch poziomach. Pierwszy z nich (społeczny) wyznacza tożsamość budowaną w kontrze do percypowanego negatywnego odbioru społecznego. Drugi poziom (indywidualny) to praca „do wewnątrz”, obrazująca mierzenie się z etycznymi wyzwaniami związanymi z wykonywanym zawodem. Na podstawie przeprowadzonych wywiadów rozpoznaję cztery strategie racjonalizacji tępienia zwierząt. Owe dwa poziomy pracy nad tożsamością posiadają wspólny rdzeń, którym jest przekonanie o społecznej użyteczności pracy w deratyzacji.
This article analyzes the discursive practices that shape rat exterminators’ professional identity. Interviews with pest control professionals (PCPs) reveal the rhetorics of hard work on their identity. My main thesis is that the shaping of this identity is performed on two levels. The first one (social) is about identity shaped in opposition to the perceived negative social reception of this profession. The second one (personal)is about internal work based on struggling with the ethical challenges connected with the professional duties. Based on the conducted interviews, I have recognized four strategies of the rationalization of exterminating animals. The above-mentioned two levels of identity work have the common, namely the belief in the social usefulness of working in pest control.
Źródło:
Przegląd Socjologii Jakościowej; 2020, 16, 4; 192-209
1733-8069
Pojawia się w:
Przegląd Socjologii Jakościowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Control Analysis of Porcelain Products Using Overall Equipment Effectiveness and Statistical Quality Control Methods
Autorzy:
Nurprihatin, Filscha
Rembulan, Glisina Dwinoor
Andry, Johanes Fernandes
Immanuella, Sarah
Widiwati, Ivana Tita Bella
Powiązania:
https://bibliotekanauki.pl/articles/24200522.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
porcelain manufacturing
overall equipment effectiveness
statistical quality control
tolerance limit
failure mode and effects analysis
Opis:
This study uses statistical quality control (SQC) and overall equipment effectiveness (OEE) to examine quality at a porcelain production firm. The study is motivated by the most frequently broken machines in 2019, is the Jigger 01 machine. This paper aims to evaluate the machine’s effectiveness using the OEE method. The OEE determines the scope of the problem to be solved using the SQC method. The average OEE value in 2019 was 70%. Based on the SQC method, the product defect produced is still under control. However, the average defect is still above the company’s tolerance limit of 10%. Consequently, this study offers enhancements utilizing the Failure Mode Effect Analysis (FMEA) technique. The results indicate that human resources and machines caused defective products. This paper contributes to providing several improvements that the company can apply to maximize its quality control analysis. After implementing the improvement, the OEE value increases to 74%.
Źródło:
Management and Production Engineering Review; 2023, 14, 3; 134--147
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Educational Value of Control and Evaluation Activities
Autorzy:
Kojs, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1967634.pdf
Data publikacji:
2019-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
education
value
structure of activity
subject of activity
control
evaluation
comparative analysis
praxis pedagogy
Opis:
Education is a metaprocess focused on causing changes in individual and social resources of experience, knowledge, skills, attitudes, beliefs and aspirations, as well as in the state of health and physical fitness. This system of processes consists of many diverse interrelated interactions, actions, acts, deeds and activities, with many related elements and components, and among them control and evaluation activities. The purpose of the article is to present the results of analyzes and thoughts related to the determination of the role of these activities among other educational acts, related in particular to cooperation and mutual interaction. It goes well beyond the commonly accepted so-called school and colloquial understanding of these terms. They are treated primarily as cognitive and research activities, as well as valuing activities, as subject-making, person-forming and sociogenic tools. The basis of the research was a diachronic-synchronous model of the full, broadly understood act of educational activity. The resulting conclusions indicate their fundamental role in education.
Źródło:
The New Educational Review; 2019, 57; 103-114
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki krytyczne w operacyjnym sterowaniu systemami
Critical factors in operational control systems
Autorzy:
Stolc, L.
Powiązania:
https://bibliotekanauki.pl/articles/266460.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
sterowanie systemami
analiza wrażliwości
niedeterministyczne programowanie liniowe
control systems
sensitivity analysis
nondeterministic linear programming
Opis:
W pracy omawiane jest zagadnienie badania krytycznych czynników w funkcjonowaniu systemu produkcyjnego w warunkach niepewności. Jako miarę określającą wartości krytyczne przyjęto miary dopuszczalności rozwiązań otrzymywanych w podproblemie planowania obciążeń systemu. Miary określane są w zależności od opisu niepewności w postaci przedziałowej, rozmytej czy też stochastycznej. W pracy ograniczono się do zagadnienia z modelem stochastycznym. W przypadku tym miarą dopuszczalności jest prawdopodobieństwo zachowania dopuszczalności przyjmowanego do realizacji rozwiązania bazowego liniowego wieloprzedziałowego problemu planowania obciążeń.
The work in question is the issue of examination of the critical factors in the functioning of the production system in conditions of uncertainty. As far as defining critical limits were adopted measure the acceptability of the solutions obtained in problems planning burden system. Measurement shall be determined according to the description of the uncertainties in the form multipartial fuzzy and stochastic optimization. The work was limited to issues with stochastic model in the case of the measure of acceptability is likely to preserve the acceptability of having entered into the implementation of the solution's base line multipartial problem planning burdens.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2011, 30; 113-118
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytic Interpolation and the Degree Constraint
Autorzy:
Georgiou, T. T.
Powiązania:
https://bibliotekanauki.pl/articles/908329.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
interpolacja analityczna
szereg czasowy
analytic interpolation
uniformly optimal control
spectral analysis of time-series
Opis:
Analytic interpolation problems arise quite naturally in a variety of engineering applications. This is due to the fact that analyticity of a (transfer) function relates to the stability of a corresponding dynamical system, while positive realness and contractiveness relate to passivity. On the other hand, the degree of an interpolant relates to the dimension of the pertinent system, and this motivates our interest in constraining the degree of interpolants. The purpose of the present paper is to make an overview of recent developments on the subject as well as to highlight an application of the theory.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 271-279
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active vibration control of a gyroscopic rotor using experimental modal analysis
Autorzy:
Jungblut, Jens
Fischer, Christopher
Rinderknecht, Stephan
Powiązania:
https://bibliotekanauki.pl/articles/2090681.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modal analysis
active vibration control
piezoelectrical bearing
analiza modalna
aktywna kontrola wibracji
łożysko piezoelektryczne
Opis:
A gyroscopic rotor exposed to unbalance is studied and controlled with an active piezoelectrical bearing. A model is required in order to design a suited controller. Due to the lack of related publications utilizing piezoelectrical bearings and obtaining a modal model purely exploiting experimental modal analysis, this paper reveals a method to receive a modal model of a gyroscopic rotor system with an active piezoelectrical bearing. The properties of the retrieved model are then incorporated into the design of an originally model-free control approach for unbalance vibration elimination, which consists of a simple feedback control and an adaptive feedforward control. After the discussion on the limitations of the model-free control, a modified controller using the priorly identified modal model is implemented on an elementary rotor test-rig comparing its performance to the original model-free controller.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e138090, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The process of map calibration and its impact on the quality and accuracy of cartographic materials
Autorzy:
Klapa, P.
Powiązania:
https://bibliotekanauki.pl/articles/100530.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
raster
map calibration
control points
accuracy of analysis
cartographic material
punkt kontroli
materiał kartograficzny
Opis:
The calibration process is a procedure that enables adjusting the scanned portion of the map to the current frame of reference, and equipping it with cartometric properties. As a result of the said process, the raster image becomes cartographic material that can be applied, among others, to the context of geodetic work. There are numerous methods of image transformation and ways of selecting the control points, according to which this process can be carried out. In the paper, the authors present the literature review featuring various problems related to the map calibration process, as well as the methods of transformation, and the ways of selecting the control points. The work was carried out in reference to the example of scanned fragments of cadastral maps, which were then subjected to calibration processes using crosses of map graticule lines and based on situational details. The calibration process was carried out several times using a different number of adaptation points while changing their location and the manner of selection.
Źródło:
Geomatics, Landmanagement and Landscape; 2018, 1; 33-43
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane zagadnienia ergonomii nowoczesnych systemów informacji pasażerskiej i sterowania ruchem
Some aspects of the ergonomics of the modern systems of passenger information and the traffic control
Autorzy:
Cieślakowski, S.
Rudzki, P.
Powiązania:
https://bibliotekanauki.pl/articles/312940.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
system informacji pasażerskiej
systemy sterowania ruchem
sterowanie ruchem
transport publiczny
analiza ergonomiczna
information system passenger
traffic control systems
motion control
public transport
ergonomic analysis
Opis:
W pracy zaprezentowano i przeanalizowano współczesne urządzenia informacyjne dedykowane pasażerom oraz urządzenia wizualizacji nowoczesnych systemów sterowania ruchem obsługiwane przez dyżurnych ruchu, w aspekcie ich widoczności i czytelności. Urządzenia informacyjne dla pasażerów powinny być umieszczane w punktach obsługi podróżnych takich jak: dworce, przystanki osobowe, a także wewnątrz taboru, w taki sposób, aby mogły realizować podstawowe zadania, jakim jest prawidłowe informowanie o ruchu pociągów. Można zaliczyć do nich komputerowe systemy wizualnej informacji podróżnych w postaci tablic informacyjnych o zmiennej treści: zbiorczych, peronowych, tunelowych oraz monitorów informacyjnych. Również dyżurny ruchu obsługuje komputer, który otrzymuje informacje o sytuacji ruchowej na stacji i przetwarza je na obrazy wyświetlane na monitorze.
Then is presented and analyzed some modern devices dedicated to the passengers and the devices of the visualization of the modern systems of traffic control served by duty traffic, in the aspect of their visibility and legibility. Information devices for passengers should be placed in traveller service points such as: stations, personal halts, and also inside the rolling stock, in such way to solve basic tasks which are correct information about trains. You can include to then both computer systems of visual information and the figure information boards about changing content: summary, platform, tunnel and information monitors. The duty traffic operate computer which receives information about the traffic situation on the station and processes them on paintings displayed on the monitor.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 130-134
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modyfikacje modelu analizy odchyleń kosztów standardowych
Modifications of standard cost deviation analysis model
Autorzy:
Kes, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/584037.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
analiza odchyleń
rachunek kosztów standardowych
metody analizy przyczynowej
kontrola budżetowa
deviations analysis
standard cost account
methods of causal analysis
budgetary control
Opis:
Rachunek kosztów standardowych dostarcza szeregu informacji przydatnych w procesie zarządzania. W szczególności są to dane na temat poziomu odchyleń kosztów wytworzenia. Skuteczne sprawowanie kontroli wymaga ustalenia przyczyn zaistniałych odchyleń. Analiza czynnikowa jest podstawowym narzędziem umożliwiającym obliczanie wpływu zmian w poziomie obserwowanych czynników wpływających na koszty. Wpływ tych czynników można obliczyć za pomocą modelu analizy odchyleń kosztów standardowych. Model określa etapy postępowania, elementy składowe, na które dzielone jest odchylenie całkowite, oraz w jaki sposób obliczane są poszczególne elementy. W tym podejściu dominuje metoda kolejnych podstawień. W związku z subiektywizmem tej metody w artykule zaproponowano modyfikację algorytmu. W celu poprawy obiektywizmu podziału odchyleń cząstkowych przedstawiano podejście wykorzystujące metodę logarytmowania.
The standard costing provides a number of information useful in the management process. In particular, these are data on the level of deviations of manufacturing costs. Effective control requires determining the reasons for the deviations. Factor analysis is the basic tool for calculating the impact of changes in the level of observed factors affecting costs. The impact of these factors can be calculated using the standard cost deviation analysis model. The model determines the stages of the procedure, the components on which the total deviation is divided and how the individual elements are calculated. In this approach, the method of subsequent substitutions is dominated. In connection with the subjectivism of this method, the algorithm has been proposed in the article. In order to improve the objectivity of division of partial deviations, the article presents an approach using the logarithmic method.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2019, 544; 146-158
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiz ehnergeticheskojj ehffektivnosti razlichnykh sposobov regulirovanija nasosov v sistemakh vodosnabzhenija
The energy efficiency analysis of various methods of regulating pumps in systems of water supply
Autorzy:
Nikolenko, I.
Shvagurev, P.
Powiązania:
https://bibliotekanauki.pl/articles/77225.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
energy efficiency
flow
pressure
quality control
pump
centrifugal pump
water supply system
water consumption
statistical analysis
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 1
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect Control of Corporations: Analysis and Simulations
Autorzy:
Stach, I.
Powiązania:
https://bibliotekanauki.pl/articles/375977.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
corporate shareholding analysis
cooperative game theory
direct and indirect control
financial and economic modeling
power indices
Opis:
This paper is devoted to the concept of indirect control in corporate shareholding networks. This topic is important in financial economics. Since shareholding size does not actually reflect an investor’s power-control in corporate shareholding networks, diverse approaches to measuring the control-power of investors has been proposed. We focus in particular on a game-theoretical approach; specifically the model of Denti and Prati (2001) and its implementation to control sharing analysis and simulation in shareholding networks thanks to the computer program „Control Sharing Simulation”.
Źródło:
Decision Making in Manufacturing and Services; 2017, 11, 1-2; 31-51
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and Control of a 4-wheel Skid-steering Mobile Robot
Autorzy:
Kozłowski, K.
Pazderski, D.
Powiązania:
https://bibliotekanauki.pl/articles/907961.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
robot mobilny
backstepping
analiza Lyapunova
mobile robots
skid-steering vehicles
time-varying control laws
Lyapunov analysis
Opis:
A mathematical model of a 4-wheel skid-steering mobile robot is presented in a systematic way. The robot is considered as a subsystem consisting of kinematic, dynamic and drive levels. Next, a designing process of a kinematic controller based on the algorithm introduced by (Dixon et al., 2001) is shown. An extension of the kinematic control law at the dynamic and motor levels using the Lyapunov analysis and the backstepping technique is developed. To validate the designed algorithm, extensive simulation results for trajectory tracking and set-point cases are discussed. Some deliberations concerning the tuning of the controller are presented, too.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 477-496
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Call Admission Control for UTRAN
Autorzy:
Wągrowski, M.
Ludwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/307858.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
blocking and dropping of calls
call admission control
measurement based optimization
radio resource management
traffic analysis
Opis:
This paper addresses the traffic's grade of service indicators: call blocking and dropping rates as well as the optimization of their mutual relation, corresponding to the call admission control procedure configuration. In the presented results of simulations authors showed opportunities for the CAC load threshold adaptation according to the traffic volume and user mobility changes observed in the mobile radio network.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 74-80
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie kart kontrolnych i metod wspomagających w inżynierii produkcji
Autorzy:
Wolnowska, A.
Kopacz, M.
Powiązania:
https://bibliotekanauki.pl/articles/409993.pdf
Data publikacji:
2012
Wydawca:
STE GROUP
Tematy:
inżynieria produkcji
statystyczne sterowanie procesem
analiza Pareto-Lorenza
production engineering
statistical process control
Pareto-Lorenz analysis
Opis:
In the article there were presented chosen method associated with statistical control of production processes. Mainly focused on control cards and Pareto-Lorenz analysis. Showed method were implemented to analysis production process stability of hearing aids in X company (the brand name don’t give because date of production is secret). Researches were made few months after new assembly lines starts-up. Main aim of researches was defects types identification occurred in production process and determine the scale of effect. Finally received results were satisfactory, i.e. despite of occurred errors, control cards analysis showed that production process of BTE-type (Behind-The-Ear) hearing aids was stable.
W artykule przedstawione zostały wybrane metody związane ze statystycznym sterowaniem procesami produkcyjnymi. Głównie skupiono się na kartach kontrolnych i analizie Pareto-Lorenza. Wskazane metody zastosowano do analizy stabilności procesu produkcji aparatu słuchowego firmy X (nazwy firmy nie podano ze względu na poufność danych produkcyjnych). Badania przeprowadzono w kilka miesięcy od uruchomienia linii produkcyjnej. Celem badań była identyfikacja rodzajów wad występujących w procesie produkcji oraz określenie skali tego zjawiska. Ostatecznie otrzymano wyniki zadowalające, tj. pomimo występujących błędów, analiza kart kontrolnych p wykazała, że proces produkcji aparatu słuchowego typu BTE (ang. Behind-The-Ear) był stabilny.
Źródło:
Management Systems in Production Engineering; 2012, 4 (8); 29-36
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field-oriented control of five-phase induction motor with open-end stator winding
Autorzy:
Listwan, J.
Pieńkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/141002.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analysis
field-oriented control
five-phase induction motor
open-end winding
simulation studies
space-vector modulation
Opis:
The mathematical model of the five-phase squirrel-cage induction motor and the system of the dual five-phase voltage source inverter have been presented. The control methods and control systems of the field-oriented control of the five-phase induction motor with an open-end stator winding are described. The structures of the direct fieldoriented control system (DFOC) and the Indirect Field-oriented control system (IFOC) with PI controllers in outer and inner control loops are analyzed. A method of space vector modulation used to control the system of the dual five-phase voltage source inverter has been discussed. The results of simulation studies of the field-oriented control methods are presented. Comparative analysis of the simulation results was carried out.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 395-410
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and control of dual stator Winding induction motor
Autorzy:
Pieńkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/141285.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model matematyczny
analiza
IFOC
dual stator induction motor
mathematical models
analysis
DFOC and DTC control
Opis:
The paper presents the mathematical models of dual stator squirrel-cage induction motor, formulated in phase coordinate system and in general transformed space vector form. The two types of models of dual stator induction motor are considered. The control systems of field-oriented control (IFOC and DFOC) and direct torque control (DTC) of the dual stator induction motor have been described and discussed.
Źródło:
Archives of Electrical Engineering; 2012, 61, 3; 421-438
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended Kalman filter based speed-sensorless load torque and inertia estimations with observability analysis for induction motors
Autorzy:
Zerdali, E.
Barut, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193483.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
extended Kalman filter
induction motor
load torque estimation
inertia estimation
speed-sensorless control
observability analysis
Opis:
This paper aims to introduce a novel extended Kalman filter (EKF) based estimator including observability analysis to the literature associated with the high performance speed-sensorless control of induction motors (IMs). The proposed estimator simultaneously performs the estimations of stator stationary axis components of stator currents and rotor fluxes, rotor mechanical speed, load torque including the viscous friction term, and reciprocal of total inertia by using measured stator phase currents and voltages. The inertia estimation is done since it varies with the load coupled to the shaft and affects the performance of speed estimation especially when the rotor speed changes. In this context, the estimations of all mechanical state and parameters besides flux estimation required for high performance control methods are performed together. The performance of the proposed estimator is tested by simulation and real-time experiments under challenging variations in load torque and velocity references; and in both transient and steady states, the quite satisfactory estimation performance is achieved.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 115-127
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significance of factor describing visual control in the second management principle of Toyota in the automotive supply industry
Autorzy:
Mielczarek, K.
Knop, K.
Powiązania:
https://bibliotekanauki.pl/articles/111615.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
visual control
statistical analysis
BOST method
automotive supply industry
kontrola wizualna
analiza statystyczna
metoda BOST
Opis:
The article presents research results in a scope of evaluation importance in visual control usage in the production processes of enterprises from automotive industry. The significance of visual control in a production process was characterized. An innovative BOST questionnaire survey was described as a tool for transformation of Toyota's management principles into questions. The survey questions from BOST study were described, which is used in evaluation of the visual control importance with reference to the second Toyota's management principle (question E3). The analysis of respondents preference in ranging factors of the second Toyota's management principle was conducted using comparative evaluation of Thurstone’s method, as well as the degree of similarity between these factors was indicated. A subjective factor was assessed by employees of automotive industry as one of less significant in the production process.
Źródło:
Production Engineering Archives; 2016, 13, 4; 16-19
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliable robust path planning with application to mobile robots
Autorzy:
Pepy, R.
Kieffer, M.
Walter, E.
Powiązania:
https://bibliotekanauki.pl/articles/930096.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza interwałowa
planowanie trajektorii
sterowanie odporne
interval analysis
path planning
robust control
state-space models
Opis:
This paper is devoted to path planning when the safety of the system considered has to be guaranteed in the presence of bounded uncertainty affecting its model. A new path planner addresses this problem by combining Rapidly-exploring Random Trees (RRT) and a set representation of uncertain states. An idealized algorithm is presented first, before a description of one of its possible implementations, where compact sets are wrapped into boxes. The resulting path planner is then used for nonholonomic path planning in robotics.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 413-424
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of statistical stability of steel strip hot-rolling process
Badanie statystycznej stabilności procesu walcowania na gorąco taśmy stalowej
Autorzy:
Czarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/264141.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
zarządzanie jakością
metody statystyczne
statystyczne sterowanie procesem (SPC)
karty kontrolne
analiza zdolności procesu
quality management
statistical methods
statistical process control (SPC)
control charts
process capability analysis
Opis:
Statistical methods belong to the basic quality tools. Among statistical instruments the statistical process control SPC takes particular place. One of the principal tasks of SPC is monitoring of a process by means of control charts. They are first of all Shewhart's control charts. The aim of investigations was to assess stability of technological process of hot-rolling of steel strip. There were available the results of thickness measurements madę with an X-ray thickness gauge as well as measurements of convexity and wedge shape made with a profile measurement gauge. The assessment of statistical process stability was performed by means of Shewarfs control charts technique. In case of thickness the estimation of capability indices Cp, Cpk and Pp, Ppk have been carried out, in addition.
Metody statystyczne należą do podstawowych narzędzi jakości. Szczególne miejsce wśród tych metod zajmuje statystyczne sterowanie procesem (SPC). Jednym z podstawowych zadań SPC jest monitorowanie procesu za pomocą kart kontrolnych; są to przede wszystkim karty kontrolne Shewharta. Celem badań była ocena stabilności procesu walcowania na gorąco taśmy stalowej ze względu na następujące parametry: grubość, wypukłość, klinowatość. Pomiar grubości przeprowadzono za pomocą gruboś domierza rentgenowskiego, natomiast do pomiarów wypukłości i klinowatości użyto profilomierza. Ocenę statystycznej stabilności procesu przeprowadzono za pomocą techniki kart kontrolnych. W przypadku grubości wyznaczono również współczynniki zdolności procesu Cp, Cpk oraz Pp, Ppk.
Źródło:
Metallurgy and Foundry Engineering; 2008, 34, 1; 33-38
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza stanów dynamicznych przekształtnika DC/DC sterowanego metodą PWM
Analysis of dynamic states of a DC/DC converter with the PWM control scheme
Autorzy:
Bogdan, A.
Citko, T.
Powiązania:
https://bibliotekanauki.pl/articles/158195.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
analiza stanów dynamicznych
przekształtnik
przekształtnik DC/DC
analysis of dynamic state
DC/DC converter
PWM control scheme
Opis:
W artykule przedstawiono liniowy model dynamiczny przekształtnika impulsowego sterowanego metodą PWM w odniesieniu do zmiennych uśrednionych. Na konkretnym przykładzie został zaprezentowany dobór regulatora w napięciowej pętli regulacyjnej. Dynamiczne właściwości układu zostały potwierdzone za pomocą jego symulacji w programie PSIPICE.
In the paper a linear dynamic model of an impulse DC/DC converter is presented and discussed. The converter is controlled with the use of the PWM (pulse width modulation) method, applied to the averaged variables. The simulation example presents the process of tuning the controller, which works in the voltage control loop. dynamic properties of the system have been extensively investigated in the series of numerical experiments, performed in the PSPICE simulation package.
Źródło:
Pomiary Automatyka Kontrola; 2004, R. 50, nr 10, 10; 33-36
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Access control system for RFID-tagged documents in supply chain management
System kontroli uprawnień do dokumentów w oparciu o RFID w obrębie łańcucha dostaw
Autorzy:
Nowicki, T.
Kiedrowicz, M.
Waszkowski, R.
Chodowska, A.
Lach, A.
Powiązania:
https://bibliotekanauki.pl/articles/361974.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Logistyki
Tematy:
modeling
business process management
business analysis
RFID
access control
modelowanie
zarządzanie procesem biznesowym
analiza biznesowa
kontrola dostępu
Opis:
Background: The information exchange process within the supply chain management is considered key to managing physical product flow and improving cost and service performance of enterprises. There are many different types of information that can be shared within the supply chain. In some cases, the information shared has to be strongly secured. The aim of the paper is to prepare appropriate models and design of the RFID-based access control system, as well as its architecture, including the domain model, requirements, business process models, and user interfaces. Methods: The paper presents the concept and design models of the access control system for RFID-tagged documents in supply chain management. The system architecture and design models, including the domain model, requirements, business process models, and user interfaces were described. Results: The access control system allows to assign privileges to particular persons or groups of persons for specific documents. When implementing the processes related to the handling of documents, the required privileges are verified. Existence or lack of such privileges affects further development of such processes. Conclusions: The module of privileges (using the functionalities of the Aurea BPM and Archer-DMS systems) including the user authorization to handle the documents at different sensitivity levels was developed.
Proces wymiany informacji w obrębie łańcucha dostaw jest używany za kluczowy czynnik w przepływie materiałów jak również dla poprawy jakości zarządzania kosztami i poziomem obsługi klienta w przedsiębiorstwie. Istnieje kilka różnych typów informacji, których wymiana następuje w obrębie łańcucha dostaw. W niektórych przypadkach informacja ta musi być szczególnie chroniona. Celem tej pracy było przygotowanie odpowiednich modeli oraz zaprojektowanie systemu kontroli dostępu w oparciu o technologię RFID jak również jego architektury, w tym modele domeny, wymagań, modelu procesu biznesowego oraz interfejsów użytkownika. Metody: Zaprezentowano koncepcję oraz modele projektowe systemu kontroli dostępu w oparciu o technologię RFID w zarządzaniu łańcuchem dostaw. Opisano architekturę systemu i modele projektowe w tym modele domeny, wymagań, modelu procesu biznesowego oraz interfejsów użytkownika. Wyniki: System kontroli dostępu umożliwia nadawanie uprawnień poszczególnym użytkowników lub ich grupom dostępu do poszczególnych dokumentów. W trakcie realizacji procesów pozyskiwania dokumentów, następuje weryfikacja uprawnień. Brak tych uprawnień ma wpływ na dalsze postępowanie w trakcie analizowanego procesu. Wnioski: Opracowano moduł uprawnień (przy zastosowaniu funkcjonalności systemów Aurea BPM oraz Archer-DMS), w tym autoryzacji użytkownika, w celu zarządzania dostępem do dokumentów na wymaganym poziomie.
Źródło:
LogForum; 2017, 13, 1; 91-101
1734-459X
Pojawia się w:
LogForum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-formal methods in safety railway control systems validation
Autorzy:
Magott, J.
Lewiński, A.
Perzyński, T
Powiązania:
https://bibliotekanauki.pl/articles/393301.pdf
Data publikacji:
2013
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
safety analysis
railway control computer system
THR
FTA
FTTD method
Markov process analysis
analiza bezpieczeństwa
komputerowe systemy sterowania ruchem kolejowym
metoda FTTD
analiza procesu Markowa
Opis:
Th e paper deals with extending the obligatory methods of safety proof of railway control and management computer systems towards more formalized methods based on mathematical apparatus. Such semi-formal methods are recommended by existing EU standards for the design, but also to demonstrate safe operation in accordance with the principle of the rail fail-safe rule, where no single error does not lead to catastrophic situations. Th e paper proposes an extension method of FTA (Fault Tree Analysis) method to FTTD (Fault Tree with Time Dependencies), and an analysis of THR method (Tolerable Hazard Rate) to the analysis of probability of catastrophic fault based on stationary Markov processes. Basic methods and their extension are shown on typical examples of rail automation systems: cross-level protection system and interlocking system.
Źródło:
Archives of Transport System Telematics; 2013, 6, 1; 32-36
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ważność kontroli wizualnej w procesie produkcyjnym przedsiębiorstwa z branży metalowej
The importance of visual control in the production process of the company from the metal industry
Autorzy:
Knop, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1058525.pdf
Data publikacji:
2019-11-30
Wydawca:
Polskie Wydawnictwo Ekonomiczne
Tematy:
kontrola wizualna
zarządzanie wizualne
analiza statystyczna
branża metalowa
visual control
visual management
statistical analysis
metal industry
Opis:
W artykule przedstawiono wyniki w zakresie oceny znaczenia kontroli wizualnej (zarządzania wizualnego) w procesie produkcyjnym profili aluminiowych w przedsiębiorstwie z branży metalowej zajmującym się produkcją architektonicznych systemów profili aluminiowych. W celu oceny ważności kontroli wizualnej wykorzystano ankietę „BOST – zasady zarządzania Toyoty w pytaniach”, gdzie respondentami byli pracownicy produkcyjni badanego przedsiębiorstwa. Uzyskane dane ankietowe poddano analizie statystycznej celem odkrycia dodatkowych zależności w odpowiedziach pracowników. Wynikiem badań był ranking ważności czynników procesu produkcyjnego oraz miejsce w tym rankingu kontroli wizualnej. Kontrola wizualna okazała się mieć duże znaczenie w procesie produkcyjnym profili aluminiowych według pracowników, uplasowała się na drugim miejscu w szeregu ważności wśród rozpatrywanych sześciu czynników procesu produkcyjnego, co należy uznać za wynik realizowanych przez badaną firmę działań w zakresie wdrożenia i utrzymania systemu wczesnego wykrywania problemów opartego o narzędzia kontroli wizualnej.
The article presents the results in the assessment of the importance of visual control (visual management) in the production process of aluminum profiles in an enterprise in the metal industry involved in the production of architectural aluminum profile systems. In order to assess the validity of the visual control, the "BOST — Toyota management rules in questions" questionnaire was used, where the respondents were production workers of the examined enterprise. The obtained survey data was subjected to statistical analysis to discover additional dependencies in the employees' responses. The result of the research was the ranking of the importance of factors in the production process and the place in this ranking of visual control. Visual control proved to be of great importance in the production process of aluminum profiles by employees, ranked second in the importance series among the six factors of the production process, which should be considered the result of the company's activities in the implementation and maintenance of an early detection system based on for visual control tools
Źródło:
Marketing i Rynek; 2019, 11; 69-74
1231-7853
Pojawia się w:
Marketing i Rynek
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The maximum principle in optimal control, then and now
Autorzy:
Clarke, F.
Powiązania:
https://bibliotekanauki.pl/articles/970551.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
warunek konieczny
zasada maksimum
analiza niegładka
optimal control
necessary conditions
maximum principle
nonsmooth analysis
Opis:
We discuss the evolution of the Pontryagin maximum principle, focusing primarily on the hypotheses required for its validity. We proceed to describe briefly a unifying result giving rise to both classical and new versions, a recent theorem of the author giving necessary conditions for optimal control problems formulated in terms of differential inclusions. We conclude with a new application of this result for the case in which mixed constraints on the state and control are imposed in terms of equalities, inequalities, and unilateral set constraints. In order to lighten the exposition, the discussion is limited to differentiable data, thereby avoiding mention of generalized gradients or normal cones, except, in the technical section on differential inclusions.
Źródło:
Control and Cybernetics; 2005, 34, 3; 709-722
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined cooling, heat and power (Trigeneration) at Offenburg University of Applied Sciences
Autorzy:
Gopisetty, S.
Treffinger, P.
Powiązania:
https://bibliotekanauki.pl/articles/363076.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
control strategy
energy analysis
modes of operation
trigeneration
analiza strategii kontroli
analiza energii
tryby pracy
trójgeneracja
Opis:
The energy supply of Offenburg University of Applied Sciences (HS OG) was changed from separate generation to trigeneration in 2007/2008. Trigeneration was installed for supplying heat, cooling and electrical power at HS OG. In this paper, trigeneration process and its modes of operation along with the layout of the energy facility at HS OG were described. Special emphasis was given to the operation schemes and control strategies of the operation modes: winter mode, transition mode and summer mode. The components used in the energy facility were also outlined. Monitoring and data analysis of the energy system was carried out after the commissioning of trigeneration in the period from 2008 to 2011. Thus, valuable performance data was obtained.
Źródło:
Environmental Biotechnology; 2013, 9, 1; 25-37
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rational design of rotor of the asynchronous motor fan for cooling units of diesel locomotives
Racionalnaja konstrukcija rotora asinkhronnogo reguliruemogo motor-ventiljatora dlja okhlazhdajushhikh ustrojjstv teplovozob
Autorzy:
Zakharchuk, I.
Zakharchuk, O.
Bukhtiyarov, I.
Powiązania:
https://bibliotekanauki.pl/articles/793084.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
asynchronous motor fan
rotor
cooling unit
diesel locomotive
speed control
comparative analysis
experimental study
rational design
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
P1-TS fuzzy scheduling control system design using local pole placement and interval analysis
Autorzy:
Smoczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/199816.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
P1-TS fuzzy system
scheduling control
LPV discrete-time system
local pole placement
interval analysis
Opis:
The linear parameter-varying (LPV) discrete-time model based design of a fuzzy scheduling control scheme is developed through incorporating the advantages of P1-TS theory, and applying the local pole placement method and interval analysis of closed-loop system polynomial coefficients. The synthesis of fuzzy scheduling control scheme is proposed in the form of iterative procedure, which enables to find the appropriate number of intervals of a fuzzy interpolator ensuring that a family of local linear controllers places closed-loop polynomial coefficients within a desired range. The computational complexity of multidimensional fuzzy scheduling control scheme synthesis is reduced using a fundamental matrix method and recursive procedure for fuzzy rule-based interpretation. The usability of the proposed method is illustrated by an implementation example and experimental results obtained on a laboratory scaled overhead crane.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 455-464
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowe wskaźniki efektywności procesu wdrażania produkcji nowatorskich wyrobów, realizowanego na podstawie wytycznych branży motoryzacyjnej
New efficiency indicators of innovative products implementation process realized on the basis of automotive requirements
Autorzy:
Gawlik, J.
Rewilak, J.
Tokaj, T.
Powiązania:
https://bibliotekanauki.pl/articles/340061.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Zarządzania Produkcją
Tematy:
APQP (Advanced Product Quality Planning)
PPAP (Production Part Approval Process)
flowchart
FMEA
control plan
MSA (Measurement System Analysis)
SPC (Statistical Process Control)
Taguchi's loss function
Opis:
One of the requirements of the process approach is to identify the methods and evaluation criteria for process measurement. Efficiency described as the ability to achieve planned results with respect to consumed resources may be a measure used for evaluation of processes. The article presents a few concepts of efficiency indicators that can be used in assessing the activities carried out within the framework of the implementation of new projects, according to standards of automotive industry. These standards are: APQP (Advanced Product Quality Planning) and its integral part, used in the final stage of validation of the product and process, known as PPAP (Production Part Approval Process). The paper proposes three concepts of indicators assessing the efficiency of the above-described process and one concept of calculating the efficiency indicator based on the Taguchis loss function.
Źródło:
Zarządzanie Przedsiębiorstwem; 2013, 16, 1; 2-10
1643-4773
Pojawia się w:
Zarządzanie Przedsiębiorstwem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An integrodifferential approach to modeling, control, state estimation and optimization for heat transfer systems
Autorzy:
Rauh, A.
Senkel, L.
Aschemann, H.
Saurin, V. V.
Kostin, G. V.
Powiązania:
https://bibliotekanauki.pl/articles/331160.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
heat transfer
predictive control
optimal control
state estimation
disturbance estimation
distributed parameter systems
sensitivity analysis
wymiana ciepła
regulacja predykcyjna
układ o parametrach rozłożonych
analiza wrażliwości
Opis:
In this paper, control-oriented modeling approaches are presented for distributed parameter systems. These systems, which are in the focus of this contribution, are assumed to be described by suitable partial differential equations. They arise naturally during the modeling of dynamic heat transfer processes. The presented approaches aim at developing finite-dimensional system descriptions for the design of various open-loop, closed-loop, and optimal control strategies as well as state, disturbance, and parameter estimation techniques. Here, the modeling is based on the method of integrodifferential relations, which can be employed to determine accurate, finite-dimensional sets of state equations by using projection techniques. These lead to a finite element representation of the distributed parameter system. Where applicable, these finite element models are combined with finite volume representations to describe storage variables that are—with good accuracy—homogeneous over sufficiently large space domains. The advantage of this combination is keeping the computational complexity as low as possible. Under these prerequisites, real-time applicable control algorithms are derived and validated via simulation and experiment for a laboratory-scale heat transfer system at the Chair of Mechatronics at the University of Rostock. This benchmark system consists of a metallic rod that is equipped with a finite number of Peltier elements which are used either as distributed control inputs, allowing active cooling and heating, or as spatially distributed disturbance inputs.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 15-30
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elementy analizy dynamicznej oceny skutków koncentracji na rynku właściwym
Elements of a dynamic analysis of the impact assessment of a merger on the relevant market
Autorzy:
Piwowarczyk, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/508040.pdf
Data publikacji:
2015-09-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
K21, K20
prawo ochrony konkurencji
kontrola koncentracji przedsiębiorstw
analizy prospektywne
competition law
merger control
prospective analysis
Opis:
Artykuł dotyczy kwestii związanych z dynamiczną oceną skutków (dla danego rynku właściwego) koncentracji przedsiębiorstw oraz, wywodzoną z tych skutków, dopuszczalnością koncentracji. Prezentuje on kryteria, które powinny znaleźć zastosowanie w ramach prowadzonej przez organy ochrony konkurencji analizy prospektywnej, dotyczącej rynków charakteryzujących się szczególną zmiennością (lub potencjalną zmiennością). Zmienność ta, na gruncie analiz prospektywnych, sprowadza się do pewnych, wykraczających poza ramy spekulacji, antycypacji skutków koncen-tracji w sferze trendów ekonomicznych. Artykuł prezentuje wnioskowania obecne, jednak wprost niewyartykułowane, dotyczące oceny skutków koncentracji oraz horyzontu czasowego analiz prospektywnych.
The article covers issues related to dynamic impact assessment (for an individual relevant market) of mergers and, derived from that impact assessment, the permissibility of a merger. It presents criteria that should be taken into consideration by competition authorities during the relevant markets’ prospective analysis, which is characterized by particular volatility (or potential volatility). This volatility in the prospective analysis goes beyond speculations and focuses on anticipated effects of the merger in the sphere of economic trends. The article presents varies reasoning that has in practice been used in merger control cases, but has not been directly articulated. This reasoning concerns the effects of mergers and the time perspective in the prospective analysis.
Źródło:
internetowy Kwartalnik Antymonopolowy i Regulacyjny; 2015, 4, 5; 8-25
2299-5749
Pojawia się w:
internetowy Kwartalnik Antymonopolowy i Regulacyjny
Dostawca treści:
Biblioteka Nauki
Artykuł

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