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Tytuł:
Latent Class Analysis of Criminal Social Identity in a Prison Sample
Autorzy:
Boduszek, Daniel
O’Shea, Catherine
Dhingra, Katie
Hyland, Philip
Powiązania:
https://bibliotekanauki.pl/articles/430748.pdf
Data publikacji:
2014-06-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Criminal Social Identity
Latent Class Analysis
Prisoners
Opis:
This study aimed to examine the number of latent classes of criminal social identity that exist among male recidivistic prisoners. Latent class analysis was used to identify homogeneous groups of criminal social identity. Multinomial logistic regression was used to interpret the nature of the latent classes, or groups, by estimating the associationsto number of police arrests, recidivism, and violent offending while controlling for current age. The best fitting latent class model was a five-class solution: ‘High criminal social identity’ (17%), ‘High Centrality, Moderate Affect, Low Ties’ (21.7%), ‘Low Centrality, Moderate Affect, High Ties’ (13.3%),‘Low Cognitive, High Affect, Low Ties’ (24.6%), and ‘Low criminal social identity’ (23.4%). Each of the latent classes was predicted by differing external variables. Criminal social identity is best explained by five homogenous classes that display qualitative and quantitative differences.
Źródło:
Polish Psychological Bulletin; 2014, 45, 2; 192-199
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fake it Till You Make it: The Trouble with the Global East Category
Autorzy:
Szcześniak, Magda
Powiązania:
https://bibliotekanauki.pl/articles/1009228.pdf
Data publikacji:
2021-05-03
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
post-socialism; Global East; counterfeit; neoliberalism; class analysis
Opis:
The article engages in a discussion with Martin Müller’s article In Search of a Global East through the categories of class and class distinction. While recognizing the potential political value of the “Global East” project, the author questions the ideological mechanisms which naturalize the stereotype of “Eastness as forsakenness.” As she points out, one of the effects of the “political and epistemological project” of the North–South divide (as well as stereotypical categorizations of the East) is obscuring the internal class dynamics of Northern, Southern and Eastern societies. In contrast, introducing class analysis – which includes examining such practices as producing and buying counterfeits of original, luxury-brand commodities – allows us to uncover similar patterns of class distinction and reproduction across global capitalist societies of the North, South and East, and perhaps also to forge solidarities amongst classes which are regularly oppressed by the dominant global capitalist order.
Źródło:
Praktyka Teoretyczna; 2020, 38, 4; 171-179
2081-8130
Pojawia się w:
Praktyka Teoretyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of College Students with Application of Latent Class Analysis
Ocena preferencji uczniów szkoły policealnej z wykorzystaniem analizy klas ukrytych
Autorzy:
Rybicka, Aneta
Pełka, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/906857.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Latent class analysis
segmentation
evaluation of college students
Opis:
In social sciences, especially in economy, to reveal relations between variables it’s easy to apply many known statistical tools when we deal with observable (measureable) variables. The problems appear when dealing with latent variables – that are not directly observed and they are of subjective matter. It’s also an important issue to measure relations between latent variables. The example of latent variables are preferences. The preferences play a very important role in economy. Very often real market decisions, choices (or answers in a questionnaire) are described by non-metric variables (nominal and ordinal). These variables are also called qualitative. The latent class analysis allows to reveal hidden relations between observable variables. The observable variables allow, with a specified probability, to find a non-observable phenomenon. The latent class analysis allows to analyze the qualitative data [see: McCutcheon 1987, p. 7; 11; Hagenaars 1993, p. 21–23]. LCA was introduced by Lazarsfeld in 1950 [1968]. The paper presents evaluation of college students with application of latent class analysis. To obtain such a goal data collected (winter recruitment of 2008/2009) by a college in Walbrzych was used.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 269
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patterns of Relapse Risks and Related Factors among Patients with Schizophrenia in Razi Hospital, Iran: A Latent Class Analysis
Autorzy:
Noroozi, Mehdi
Alibeigi, Neda
Armoon, Bahram
Rezaei, Omid
Sayadnasiri, Mohammad
Nejati, Somayeh
Fadaei, Farbod
Ghahestany, Davood Arab
Dieji, Bahman
Ahounbar, Elahe
Powiązania:
https://bibliotekanauki.pl/articles/2127857.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Razi Hospital
Iran
Relapse Risks
Patients
Schizophrenia
Latent Class Analysis
Opis:
Objectives: Relapse is very much associated with the management of disorder during the treatment, but also many other factors could trigger it. The aim of this study was to explore classes and patterns of relapse risk in patients with schizophrenia of Razi Hospital. Methods: Using random sampling techniques, we recruited 300 participants with a diagnosis of schizophrenia in Razi hospital of Tehran (Iran) between January and May 2017 in a cross-sectional survey. We used latent class analysis (LCA) to establish a baseline model of risk profiles and to identify the optimal number of latent classes, and we used ordinal regression to identify factors associated with class membership. Results: Three classes of multiple relapse risk were identified. LCA showed that, overall, 52%, 22% and 26% of participants with schizophrenia were divided into class 1, class 2 and class 3, respectively. Compared to members in the lowest-risk class (reference group), the highest-risk class members had higher odds of being the age of disorder onset under 25 (OR = 1.4; CI: 1.42–2.33). Participants with schizophrenia who were unemployed were more likely to categorize in the highest-risk class than members of the low-risk class (OR = 2.5; CI: 1.44–4.1). Also, female patients were more likely to belong to members of the high-risk class than members of the low-risk class (OR = 2.22; CI: 1.74–7.64). Conclusion: These findings emphasize the importance of having targeted prevention programs for all domains of Age of onset, female and unemployed related. So, current study suggested that interventions should focus on these risk factors. Furthermore, Increasing the Job opportunities for participants with schizophrenia is warranted so as to prevent of schizophrenia disorder.
Źródło:
Polish Psychological Bulletin; 2018, 49, 3; 355-359
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Latent class analysis in the evaluation of items in survey research
Analiza klas ukrytych w ocenie pozycji testowych w badaniach sondażowych
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/424869.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
latent class analysis
log-linear models
item response
survey questions
Opis:
Latent class analysis has been widely used in the measurement models. Models based on latent variables have a wide range of applications in the presence of repeated ob-servations, longitudinal data, and multilevel data. In this paper we present and apply log-linear analysis as a method for the analysis of multi-way tables. We also present a latent variable model based on a variable that is not directly observed. The basic model postulates an underlying categorical latent variable; within any category of the latent variable the manifest or observed categorical variables are assumed independent of one another (axiom of conditional independence). In this paper we present the results of a survey research based on categorical data and the author`s questionnaire. We present the results of the latent class analysis in the classification of respondents into clusters characterized by similar attitudes and features in economic research. We also conduct a prior log-linear analysis for a multi-way contingency table. All the calculations are conducted in R.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2018, 22, 3; 55-65
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origins of Multidimensional Class Locations in Hungary
Autorzy:
Róbert, Péter
Powiązania:
https://bibliotekanauki.pl/articles/1790258.pdf
Data publikacji:
2021-09-20
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
class analysis
forms of capital
intergenerational mobility
parental resources
Hungary
Opis:
The paper focuses on intergenerational mobility and explores the role of social origin in ending up in various class locations. Latent class analysis was applied to mapping the class structure based on economic, cultural and social assets. Parental education and occupation are used to examine how social origin operates in accumulating the various forms of capital and in getting into different class positions. Out of the forms of capital, economic resources, high cultural capital and prestige of social contacts depend particularly on social origin; these are the main channels affecting mobility into the best class locations. If coming from low educated worker class background, one may get only into one of the bottom class locations, while members of the top class positions come from families where parents hold tertiary degree and have high occupational status.
Źródło:
Polish Sociological Review; 2021, 215, 3; 371-386
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Item response theory models in the measurement theory with the use of LTM package in R
Analiza teorii odpowiedzi na pozycje testowe w teorii pomiaru z zastosowaniem pakietu LTM programu R
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/424883.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Item Response Theory (IRT)
measurement theory
latent class analysis
R software
Opis:
Item Response Theory (IRT) is an extension of the Classical Test Theory (CCT) and focuses on how specific test items function in assessing a construct. They are widely known in psychology, medicine, and marketing, as well as in social sciences. An item response model specifies a relationship between the observable examinee test performance and the unobservable traits or abilities assumed to underlie performance on the test. Within the broad framework of item response theory, many models can be operationalized because of the large number of choices available for the mathematical form of the item characteristic curves. In this paper we introduce several types of IRT models such as: the Rasch, and the Birnbaum model. We present the main assumptions for IRT analysis, estimation method, properties, and model selection methods. In this paper we present the application of IRT analysis for binary data with the use of the ltm package in R.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2018, 22, 1; 11-25
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimum strategy for mode choice modelling of interregional fish transport considering shippers heterogeneity
Autorzy:
Ansu, V.
Anjaneyulu, M. V. L. R.
Powiązania:
https://bibliotekanauki.pl/articles/2173935.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fish transport
mode choice of transport
latent class analysis
optimal strategy
transport ryb
wybór środka transportu
strategia optymalna
Opis:
The determinants of mode choice of interregional transport of fish, which is highly perishable, vastly differ from that of other commodities. These determinants are to be identified to improve transport efficiency. A questionnaire survey of shippers is used to collect the data. Highly correlated observed variables are combined to form four latent factors by factor analysis to reduce the errors in modelling. Logical relations among the component variables of latent factors are perceived, and mathematical formulations are used to estimate new variables. It is found that transportation costs and shipment weight contributes to factor 1, while distance contributes to factor 2. However, transportation costs are associated with distance and shipment weight. Thus, the variable, transportation cost per q-km, is estimated. Survey respondents' attitudes are also incorporated into modelling by including qualitative factors obtained by the factor analysis of shippers' preference ratings. A latent class analysis confirmed the existence of heterogeneity among shippers. Misrepresentations of effects occur in modelling if the heterogeneity in the data is not considered. No studies have found the best combination of observed variables, latent factors, estimated variables, and qualitative factors, considering shippers' heterogeneity in freight mode choice. Hence, this study is done to find the optimum modelling strategy. Modelling revealed that models built with estimated variables outperformed those built with latent factors. Including qualitative factors along with observed variables and estimated variables showed further improvement. However, the model that includes observed variables, estimated variables, and qualitative factors considering shippers' heterogeneity is the best. It was found that the mode selection behaviour of different latent classes of shippers is distinct. A mode shift from road to rail could be achieved by lowering transportation costs and increasing speed, reliability, and safety for fish transport. Expanding roll on-roll off facilities, dedicated freight corridors, parcel trains, refrigerated containers, and piecemeal service by rail promote a mode shift from road to rail and reduce energy usage.
Źródło:
Archives of Transport; 2022, 64, 4; 7--26
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Experience of Peer Aggression as a Heterogeneous Phenomenon: A Latent Class Analysis
Doświadczenie agresji rówieśniczej jako zjawisko niejednorodne. Analiza klas latentnych
Autorzy:
Frankowiak, Joanna
Kotyśko, Martyna
Powiązania:
https://bibliotekanauki.pl/articles/28763353.pdf
Data publikacji:
2022
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
peer aggression
adolescents
latent class analysis
prevention
cyber aggression
traditional aggression
agresja rówieśnicza
adolescenci
analiza klas latentnych
profilaktyka
cyberagresja
agresja tradycyjna
Opis:
Peer aggression, when escalated and regular, has negative consequences for proper psychosocial development. The main aim of this study was to identify classes among middle school students according to similarity in terms of experiencing particular forms and manifestations of peer aggression. Data were collected using a proprietary questionnaire, from which 10 questions forming indicators of experienced aggression (five forms, two manifestations each) were used for analysis. A total of 1.050 middle school students (525 boys and girls each) aged 13 and 14 participated in the study. The students most often experienced verbal and relational aggression, and least often sexual aggression. Boys were more likely to report experiencing physical and verbal aggression (being insulted), while girls reported being the target of gossip and cyber aggression (offensive comments). Using Latent Class Analysis, we analyzed a model with six classes as follows: Low all, High verbal and relational, High physical and verbal, High all without sexual, High all and High sexual, cyber and relational. The results show that the phenomenon of peer aggression is not homogeneous and that the design of preventive measures should take into account the specificity of the experiences of its victims.
Agresja jest wpisana w relacje rówieśnicze. Jednak nasilona i realizowana w sposób systematyczny, niesie ze sobą negatywne skutki dla prawidłowego rozwoju psychospołecznego. Głównym celem badań było wyłonienie wśród uczniów klas ze względu na podobieństwo w zakresie doświadczania poszczególnych form i przejawów agresji rówieśniczej. Dane zgromadzono za pomocą autorskiego kwestionariusza, z którego do analizy użyto 10 pytań tworzących wskaźniki doświadczanej agresji (pięć form, po dwa przejawy). W badaniu wzięło udział 1050 uczniów gimnazjum (po 525 chłopców i dziewcząt) w wieku 13 i 14 lat. Uczniowie najczęściej doświadczali agresji werbalnej i relacyjnej, a najrzadziej przejawów agresji seksualnej. Chłopcy częściej informowali o doświadczaniu agresji fizycznej i werbalnej (bycie wyzywanym), a dziewczęta o doświadczeniu plotkowania na swój temat i cyberagresji (obraźliwe komentarze). Wykorzystując Analizę Klas Latentnych, poddano analizie model z sześcioma klasami: Wszystkie wskaźniki niskie, Wysoka werbalna i relacyjna, Wysoka fizyczna i werbalna, Wysokie wszystkie poza seksualną, Wysokie wszystkie wskaźniki oraz Wysoka seksualna, cyber i relacyjna. Uzyskane rezultaty pokazują, że zjawisko agresji rówieśniczej nie jest homogeniczne, a projektowanie działań profilaktycznych powinno uwzględniać specyfikę doświadczeń jej ofiar.
Źródło:
Studia Paedagogica Ignatiana; 2022, 25, 4; 45-66
2450-5358
2450-5366
Pojawia się w:
Studia Paedagogica Ignatiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of customers’ purchasing behaviour profiles in the context of corporate social responsibility
Autorzy:
Kiliańska, Katarzyna
Pajęcki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/27313497.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
corporate social responsibility
customer profile
purchasing behaviour
food industry
latent class analysis
społeczna odpowiedzialność biznesu
profil klienta
zachowania zakupowe
przemysł spożywczy
analiza klas ukrytych
Opis:
Purpose: The aim of the article is to identify customers' purchasing behaviour profiles on the basis of characterizing the process of making a decision to purchase a product from food industry companies’ indicators (observable variables) in the context of corporate social responsibility (CSR). Design/methodology/approach: The data for the research were collected from a survey concerning a group of 801 customers from the Świętokrzyskie Voivodeship. The resources were pre-explored and pre-processed to enable further studies. In order to obtain customers profiles, the latent class analysis (LCA) method was used. It enables identification of homogeneous groups (latent classes) of customers based on selected indicators. Findings: The impact on customers’ purchasing behaviour of 15 CSR activities undertaken by enterprises from several different groups (in relation to: environment, society, employees, contractors, and customers) was examined. Six profiles of customer purchasing behaviour were identified. They were labelled and subjected to descriptive characteristics. Research limitations/implications: The results point out the need to continue the research based on a broader countrywide data set. Practical implications: The research findings can contribute to improving the effectiveness of food industry companies in the range of CSR activities. Due to this, these companies will be able to take more effective steps to retain existing customers and acquire new ones. Social implications: Taking corporate social responsibility actions contributes to solve social and environmental problems. It can also affect the quality of life in a society. Nowadays, it is an important and developmental research area. Originality/value: The conducted study showed that latent class analysis is proper tool for analysing the qualitative data obtained in the questionnaire surveys. The work provides a vital information on the impact of corporate social responsibility activities by food industry companies on customers' purchasing behaviour.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 162; 291--313
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of latent class models in economic research
Analiza modeli zmiennych ukrytych w badaniach ekonomicznych
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/425114.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
latent class models
latent variables
categorical data analysis
R software
Opis:
Latent variable models are used and applied in many areas of the social and behavioral sciences. The increasing availability of computer packages for fitting such models makes latent variable models popular, known and applied in many scientific areas. Latent variable models have a very wide range of applications, especially in the presence of repeated observations, longitudinal data, and multilevel data. The basic model postulates an underlying categorical latent variable; within any category of the latent variable the manifest or observed categorical variables are assumed independent of one another (the axiom of conditional independence). The observed relationships between the manifest variables are thus assumed to result from the underlying classification of the data produced by the categorical latent variable. In this paper we present the theoretical and methodological aspects of latent variable models, as well as their application in R software in the field of economic research.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 4 (54); 36-47
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
Autorzy:
Miranda, J.
Lotliker, A.A.
Baliareingh, S.K.
Jena, A.K.
Samanta, A.
Sahu, K.C.
Kumar, T.S.
Powiązania:
https://bibliotekanauki.pl/articles/2079007.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
size class
coastal water
long-term variability
satellite data
statistical analysis
Bengal Bay
Opis:
The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
Źródło:
Oceanologia; 2021, 63, 1; 40-50
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elite Private Secondary Education in Greece: Class Strategies and Educational Advantages
Autorzy:
Valassi, Despoina
Powiązania:
https://bibliotekanauki.pl/articles/27311619.pdf
Data publikacji:
2012-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
education
elite schools
private schools
social reproduction
class strategies
Pierre Bourdieu
field
international capital
correspondence analysis
Opis:
Too little attention has been paid to the school institutions intended to educate and socialize the children of the upper classes. Greece has a significant history of private educational institutions. Yet their history and role within the educational system and society has been consistently neglected. The study of elite private education and its relationship with the social reproduction of the upper and middle classes in Greece has been even more neglected. Through a study of elite private secondary schools, following the theoretical model of Pierre Bourdieu, we explored the relationship that the middle and upper social strata of Greek society maintain with specific private schools. In order to determine the above, we conducted a quantitative field survey at 13 well-known private schools in Athens, using a questionnaire. In these schools we find considerable over-representation of the social categories that are placed at the summit of the social hierarchy. A basic argument of our study was that different sections of the middle and upper classes develop different educational strategies to ensure their social reproduction and to increase their privileges. These different strategies adopted by traditional and more recently emerging social classes are reflected in the differences among the elite private schools as a “field” and they distinguished the very top private schools from the less prestigious one. Also, we have found that sections of the Greek upper and middle class provide their offspring, through certain schools and activities, with an international capital which is a necessary condition for their future participation in international educational and professional markets. The study’s central research methodology included geometrical data analysis such as correspondence analysis.
Źródło:
Kultura i Edukacja; 2012, 6(92); 21-41
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of neural image analysis in the identification of information encoded in a graphical form
Wykorzystanie neuronowej analizy obrazów w identyfikacji informacji zakodowanej w formie graficznej
Autorzy:
Koszela, K.
Boniecki, P.
Kuzimska, T.
Powiązania:
https://bibliotekanauki.pl/articles/956540.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
identification of class oocytes
quality classification
computer image analysis
image analysis
artificial neural networks
identyfikacja klas oocytów
klasyfikacja jakościowa
analiza obrazu
sztuczne sieci neuronowe
Opis:
Numerous scientific and research centres are searching for solutions concerning the problem of quality classification of animal oocytes. Conducting such studies is purposeful, particularly in the context of constant attempts to improve the quality of food products, which depends on the breeding value of livestock. Therefore, searching for methods of stimulation of proper development of a larger number of animal oocytes, particularly in extracorporeal conditions, gains special importance. An increasing interest in assisted reproduction techniques resulted in searching for new, increasingly effective methods of quality assessment of mammalian gametes and embryos. The expected progress in the production of animal embryos in vitro is largely dependent on proper classification of obtained oocytes. The aim of this work was to develop a non-invasive method for the quality assessment of oocytes, performed on the basis of graphic information encoded in the form of monochromatic digital images obtained via microscopy techniques. The classification process was conducted based on the information presented in the form of microphotography pictures of domestic pig oocytes, using advanced methods of neural image analysis.
Rozwiązaniem problemu klasyfikacji jakościowej oocytów zwierzęcych zajmuje się wiele różnych ośrodków naukowo-badawczych. Celowość prowadzenia takich badań jest uzasadniona szczególnie w kontekście ciągłego dążenia do podnoszenia jakości produktów żywnościowych, która jest pochodną wartości hodowlanej zwierząt gospodarskich. W związku z tym, istotnego znaczenia nabierają poszukiwania metod prowadzących do stymulowania prawidłowego rozwoju większej liczby zapładnianych oocytów zwierzęcych, zwłaszcza realizowanego w warunkach pozaustrojowych. Rosnące zainteresowanie technikami wspomaganego rozrodu stało się przyczyną poszukiwania nowych, coraz bardziej efektywnych metod oceny jakościowej gamet oraz zarodków ssaków. Oczekiwany postęp w produkcji zarodków in vitro zwierząt uzależniony jest w istocie od poprawnej klasyfikacji pozyskiwanych oocytów. Celem pracy było opracowanie bezinwazyjnej metody oceny jakościowej oocytów dokonywanej w oparciu o informację graficzną zakodowana w postaci monochromatycznych obrazów cyfrowych pozyskanych metodą mikroskopową. Proces klasyfikacji zrealizowano w oparciu o informację prezentowaną w formie zdjęć mikrofotograficznych oocytów świni domowej, wykorzystując w tym celu nowoczesne metody neuronowej analizy obrazu.
Źródło:
Agricultural Engineering; 2015, 19, 3; 25-35
2083-1587
Pojawia się w:
Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced time-frequency representation in voice signal analysis
Autorzy:
Mika, Dariusz
Józwik, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/102330.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
signal analysis
spectrogram
time-frequency analysis
time-frequency representation
Cohen’s class
Wigner-Ville distribution
analiza sygnału
spektrogram
analiza czasu
analiza częstotliwości
reprezentacja czasu i częstotliwości
klasa Cohena
rozkład Wignera-Ville'a
Opis:
The most commonly used time-frequency representation of the analysis in voice signal is spectrogram. This representation belongs in general to Cohen’s class, the class of time-frequency energy distributions. From the standpoint of properties of the resolution, spectrogram representation is not optimal. In Cohen class representations are known which have a better resolution properties. All of them are created by smoothing the Wigner-Ville’a distribution characterized by the best resolution, however, the biggest harmful interference. The used smoothing functions decide about a compromise between the properties of resolution and eliminating harmful interference term. Another class of time-frequency energy distributions is the affine class of distributions. From the point of view of readability of analysis of the best properties are known so called Redistribution of energy caused by the use of a general methodology referred to as reassignment to any time-frequency representation. Reassigned distributions efficiently combine a reduction of the interference terms provided by a well adapted smoothing kernel and an increased concentration of the signal components.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 251-259
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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