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Wyświetlanie 1-15 z 81
Tytuł:
Two heuristic alghorithms for test point selection in analog circuit diagnoses
Autorzy:
Pułka, A.
Powiązania:
https://bibliotekanauki.pl/articles/221005.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuit diagnosis
fault diagnosis
testing
search methods
heuristic optimization
Opis:
The paper presents a heuristic approach to the problem of analog circuit diagnosis. Different optimization techniques in the field of test point selection are discussed. Two new algorithms: SALTO and COSMO have been introduced. Both searching procedures have been implemented in a form of the expert system in PROLOG language. The proposed methodologies have been exemplified on benchmark circuits. The obtained results have been compared to the others achieved by different approaches in the field and the benefits of the proposed methodology have been emphasized. The inference engine of the heuristic algorithms has been presented and the expert system knowledge-base construction discussed.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 115-128
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of genotype on selected clinical features of Polish cystic fibrosis adults
Autorzy:
Majka, L
Pogorzelski, A.
Mlynarczyk, W.
Zebrak, J.
Rutkiewicz, E.
Nowicka, A.
Witt, M.
Powiązania:
https://bibliotekanauki.pl/articles/2041802.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
genotype-phenotype correlation
diagnosis
Polska
genotype
late diagnosis
cystic fibrosis
adult
Źródło:
Journal of Applied Genetics; 2001, 42, 3; 367-377
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A key metric and its calculation models for a continuous diagnosis capability based on a dependency matrix
Autorzy:
Shi, J.-Y.
Lin, X.-G.
Shi, M.
Powiązania:
https://bibliotekanauki.pl/articles/221741.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault diagnosis
dependency matrix
measurement
Opis:
This paper is devoted to measuring the continuous diagnosis capability of a system. A key metric and its calculation models are proposed enabling us to measure the continuous diagnosis capability of a system directly without establishing and searching the sequential fault tree (SFT) of the system. At first a description of a D matrix is given and its metric is defined to determine the weakness of a continuous diagnosis. Then based on the definition of a sequential fault combination, a sequential fault tree (SFT) is defined with its establishment process summarized. A key SFT metric is established to measure the continuous diagnosis capability of a system. Two basic types of dependency graphical models (DGMs) and one combination type of DGM are selected for characteristics analysis and establishment of metric calculation models. Finally, both the SFT searching method and direct calculation method are applied to two designs of one type of an auxiliary navigation equipment, which shows the high efficiency of the direct calculation method.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 509-520
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Trend Analysis of Mill Fan System Vibrations for Predictive Maintenance and Diagnostics
Autorzy:
Hadjiski, M. B.
Doukovska, L. A.
Kojnov, S. L.
Powiązania:
https://bibliotekanauki.pl/articles/226410.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technical diagnosis
fault diagnosis
predictive maintenance
manufacturing execution system (MES)
enterprise resource planning (ERP)
Opis:
Present paper considers nonlinear trend analysis for diagnostics and predictive maintenance. The subject is a device from Maritsa East 2 thermal power plant a mill fan. The choice of the given power plant is not occasional. This is the largest thermal power plant on the Balkan Peninsula. Mill fans are main part of the fuel preparation in the coal fired power plants. The possibility to predict eventual damages or wear out without switching off the device is significant for providing faultless and reliable work avoiding the losses caused by planned maintenance. This paper addresses the needs of the Maritsa East 2 Complex aiming to improve the ecological parameters of the electro energy production process.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 351-356
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Circuit Parameters for the Specified or Measured Performances
Autorzy:
Rutkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/226920.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuits
parameter identification
fault diagnosis
Opis:
Extension of the method of analog circuit parameter identification for the specified design performances, originally presented by the same author in 1982, is described. These parameters are designated by means of PSpice simulation of the adjoint circuit to the original one. In this adjoint circuit, elements of the original circuit, described by the sized parameters, are replaced by controlled sources. Each such source is controlled by the differential voltage or current, difference between the calculated voltage or current and the specified one, with infinitely large gain. The method is applicable to both linear and nonlinear DC circuits and AC circuits and can be used in many fields of analog circuit design, such as: finding of acceptability region, analog fault diagnosis, postproduction identification and tuning. In the later cases, design performances are replaced by measurements of Circuit Under Test (CUT). Simplicity, extremely low computational complexity and high accuracy are the main benefits of the proposed, basic Circuit Theory based, approach - the solution is found after a single PSpice simulation. For better understanding of the presented methodology, five practical examples are discussed.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 1; 95-100
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bovine leucocyte adhesion deficiency [BLAD] and its worldwide prevalence
Autorzy:
Pareek, C S
Kaminski, S
Powiązania:
https://bibliotekanauki.pl/articles/2047260.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gene
prevalence
clinical diagnosis
diagnosis
Holstein breed
cattle
clinical finding
bovine leucocyte adhesion deficiency
animal disease
Opis:
Bovine leukocyte adhesion deficiency (BLAD) is a well characterised lethal autosomal recessive disease that occurs in Holstein cattle. The discovery of this genetic disorder in 1990 by KEHRLI et al. was serendipitous and occurred in conjunction with studies of new methods to prevent mastitis in periparturient dairy cows ( KEHRLI et al. 1992a). In this review article we are attempting to summarise the last 6-year research (1990-1995) covering major aspects of BLAD syndrome, its worldwide prevalence with emphasize on current and future development on BLAD research.
Źródło:
Journal of Applied Genetics; 1996, 37, 3; 299-311
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Aspects of Fault Diagnosis of Nonlinear Analog Circuits
Autorzy:
Tadeusiewicz, M.
Hałgas, S.
Kuczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/226274.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuits
fault diagnosis
local and global diagnosis
multiple soft fault
nonlinear circuits
single hard faults
Opis:
The paper is focused on nonlinear analog circuits, with the special attention paid to circuits comprising bipolar and MOS transistors manufactured in micrometer and submicrometer technology. The problem of fault diagnosis of this class of circuits is discussed, including locating faulty elements and evaluating their parameters. The paper deals with multiple parametric fault diagnosis using the simulation after test approach as well as detection and location of single catastrophic faults, using the simulation before test approach. The discussed methods are based on diagnostic test, leading to a system of nonlinear algebraic type equations, which are not given in explicit analytical form. An important and new aspect of the fault diagnosis is finding multiple solutions of the test equation, i.e. several sets of the parameters values that meet the test. Another new problems in this area are global fault diagnosis of technological parameters in CMOS circuits fabricated in submicrometer technology and testing the circuits having multiple DC operating points. To solve these problems several methods have been recently developed, which employ different concepts and mathematical tools of nonlinear analysis. In this paper they are sketched and illustrated. All the discussed methods are based on the homotopy (continuation) idea. It is shown that various versions of homotopy and combinations of the homotopy with some other mathematical algorithms lead to very powerful tools for fault diagnosis of nonlinear analog circuits. To trace the homotopy path which allows finding multiple solutions, the simplicial method, the restart method, the theory of linear complementarity problem and Lemke’s algorithm are employed. For illustration four numerical examples are given.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 1; 83-93
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychiatrists’ accounts of clinical significance in depression
Autorzy:
Galasiński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/430248.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Clinical significance
diagnosis
depression
psychiatric practices
discourse
Opis:
Clinical significance is a crucial element in the diagnosis of mental illness, yet, it is practically untheorised and significantly under-researched. This article takes up the question of how the criterion of clinical significance is translated into psychiatric practice. More particularly, it examines how psychiatrists account for the threshold between health and depression. The paper is anchored in the constructionist view of discourse underpinned by the assumptions of critically oriented discourse analysis. It is based upon a convenience sample of 39 semi-structured interviews with specialistpsychiatrists in south-western Poland. There is no discursive space for clinical significance in psychiatrists’ accounts. There is no boundary, no decision to be taken as to whether the symptoms are clinically significant. Depression, invariably constructed in terms of diagnostic criteria, is always represented as fully developed, appearing out of thin air, with no period of falling ill. The article raises the issue of the validity and usefulness of psychiatric diagnosis.
Źródło:
Polish Psychological Bulletin; 2012, 43, 2; 101-111
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laparoscopy-guided prostate biopsy in dogs - a study of 13 cases
Autorzy:
Holak, P.
Adamiak, Z.
Jalynski, M.
Chyczewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/31966.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laparoscopy
prostate
biopsy
dog
male
diagnosis
histopathology
Opis:
This paper describes laparoscopy-guided prostate biopsy experiments in 13 dogs. Biopsy material was evaluated histopathologically to diagnose causes of prostatic gland enlargement. Laparoscopic biopsy was performed in male dogs diagnosed with prostatic gland enlargement, based on clinical symptoms and results of rectal examinations.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Children with Language Disorders or Late Bloomers – the problem of differential diagnosis
Autorzy:
Czaplewska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/430674.pdf
Data publikacji:
2016-09-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Late Talkers
Language Impairment
diagnosis
SLI
children
Opis:
Communication problems are often the first noticeable symptom of developmental abnormalities. About 15% of children at the age of 2 years demonstrate a lower level of speech expression than their peers. Speech development disorders may constitute either symptoms of global developmental delay or only isolated difficulties. One of the main challenges for professionals dealing with early development support is recognizing whether a child whose linguistic competence differs significantly from that of their peers suffers from a specific language impairment, or whether they belong to the group of ‘late bloomers’ who at some point, without the intervention of a specialist, will achieve an appropriate level of communication skills. Although a differential diagnosis can be extremely difficult, the analysis of the literature leads to the conclusion that there are some markers that can aid a specialist in establishing an accurate diagnosis.
Źródło:
Polish Psychological Bulletin; 2016, 47, 3; 258-264
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthetic Aperture Technique Applied to Tissue Attenuation Imaging
Autorzy:
Klimonda, Z.
Litniewski, J.
Nowicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/176945.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tissue attenuation imaging
synthetic aperture
diagnosis enhancing
Opis:
The attenuating properties of biological tissue are of great importance in ultrasonic medical imaging. Investigations performed in vitro and in vivo showed the cor- relation between pathological changes in the tissue and variation of the attenuation coefficient. In order to estimate the attenuation we have used the downshift of mean frequency (fm) of the interrogating ultrasonic pulse propagating in the medium. To determine the fm along the propagation path we have applied the fm estimator (I/Q algorithm adopted from the Doppler mean frequency estimation technique). The mean-frequency shift trend was calculated using Single Spectrum Analysis. Next, the trends were converted into attenuation coefficient distributions and finally the parametric images were computed. The RF data were collected in simulations and experiments applying the synthetic aperture (SA) transmit-receiving scheme. In measurements the ultrasonic scanner enabling a full control of the transmission and reception was used. The resolution and accuracy of the method was verified using tissue mimicking phantom with uniform echogenicity but varying attenuation coefficient.
Źródło:
Archives of Acoustics; 2011, 36, 4; 927-935
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Age at diagnosis of cancer as predictor of mutation accurrence in families suspected of HNPCC
Autorzy:
Kurzawski, G
Debniak, T.
Kladny, J.
Lubinski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2041741.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diagnosis
mutation
age
colorectal cancer
mutational analysis
cancer
Źródło:
Journal of Applied Genetics; 2001, 42, 3; 359-366
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resources evaluation in patients with multiple sclerosis: A moderation effect of time since diagnosis
Autorzy:
Nowaczyk, Natalia
Cierpiałkowska, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/2128266.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Multiple Sclerosis
Time since diagnosis
COR
Resources evaluation
Opis:
Multiple sclerosis significantly affects how patients maintain the resources they consider important. The aim of this paper is to describe the moderation effect of time since diagnosis on the evaluation of resources by patients with multiple sclerosis, on the basis of S.E. Hobfoll’s Conservation of Resources (COR) theory. The study was conducted using paper and pencil methods and involved 77 patients, of whom 32 received their diagnosis less than four years ago, and 45 more than four years ago. The patients’ resource evaluation was investigated using the Polish adaptation of the COR questionnaire. Patients who received their diagnosis more than four years ago were more likely to consider vital and spiritual resources to be more important. In patients diagnosed less than four years ago, the loss of economic, political, and vital resources was significant. It is shown moderation effect of time since diagnosis. The results may for the basis for further research.
Źródło:
Polish Psychological Bulletin; 2017, 3; 357-365
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis of analog circuit based on wavelet transform and neural network
Autorzy:
Wang, Hui
Powiązania:
https://bibliotekanauki.pl/articles/141368.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuit
fault diagnosis
neural network
wavelet transform
Opis:
Analog circuits need more effective fault diagnosis methods. In this study, the fault diagnosis method of analog circuits was studied. The fault feature vectors were extracted by a wavelet transform and then classified by a generalized regression neural network (GRNN). In order to improve the classification performance, a wolf pack algorithm (WPA) was used to optimize the GRNN, and a WPA-GRNN diagnosis algorithm was obtained. Then a simulation experiment was carried out taking a Sallen–Key bandpass filter as an example. It was found from the experimental results that the WPA could achieve the preset accuracy in the eighth iteration and had a good optimization effect. In the comparison between the GRNN, genetic algorithm (GA)-GRNN and WPA-GRNN, the WPA-GRNN had the highest diagnostic accuracy, and moreover it had high accuracy in diagnosing a single fault than multiple faults, short training time, smaller error, and an average accuracy rate of 91%. The experimental results prove the effectiveness of the WPA-GRNN in fault diagnosis of analog circuits, which can make some contributions to the further development of the fault diagnosis of analog circuits.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 175-185
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple soft fault diagnosis of BJT circuits
Autorzy:
Tadeusiewicz, M.
Hałgas, S.
Powiązania:
https://bibliotekanauki.pl/articles/221281.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuits
BJT circuits
fault diagnosis
multiple faults
Opis:
This paper deals with multiple soft fault diagnosis of nonlinear analog circuits comprising bipolar transistors characterized by the Ebers-Moll model. Resistances of the circuit and beta forward factor of a transistor are considered as potentially faulty parameters. The proposed diagnostic method exploits a strongly nonlinear set of algebraic type equations, which may possess multiple solutions, and is capable of finding different sets of the parameters values which meet the diagnostic test. The equations are written on the basis of node analysis and include DC voltages measured at accessible nodes, as well as some measured currents. The unknown variables are node voltages and the parameters which are considered as potentially faulty. The number of these parameters is larger than the number of the accessible nodes. To solve the set of equations the block relaxation method is used with different assignments of the variables to the blocks. Next, the solutions are corrected using the Newton-Raphson algorithm. As a result, one or more sets of the parameters values which satisfy the diagnostic test are obtained. The proposed approach is illustrated with a numerical example.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 663-674
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 81

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