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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
521

Efficient Sequential Sampling for Neural Network-based Surrogate Modeling

Pavankumar Channabasa Koratikere (15353788) 27 April 2023 (has links)
<p>Gaussian Process Regression (GPR) is a widely used surrogate model in efficient global optimization (EGO) due to its capability to provide uncertainty estimates in the prediction. The cost of creating a GPR model for large data sets is high. On the other hand, neural network (NN) models scale better compared to GPR as the number of samples increase. Unfortunately, the uncertainty estimates for NN prediction are not readily available. In this work, a scalable algorithm is developed for EGO using NN-based prediction and uncertainty (EGONN). Initially, two different NNs are created using two different data sets. The first NN models the output based on the input values in the first data set while the second NN models the prediction error of the first NN using the second data set. The next infill point is added to the first data set based on criteria like expected improvement or prediction uncertainty. EGONN is demonstrated on the optimization of the Forrester function and a constrained Branin function and is compared with EGO. The convergence criteria is based on the maximum number of infill points in both cases. The algorithm is able to reach the optimum point within the given budget. The EGONN is extended to handle constraints explicitly and is utilized for aerodynamic shape optimization of the RAE 2822 airfoil in transonic viscous flow at a free-stream Mach number of 0.734 and a Reynolds number of 6.5 million. The results obtained from EGONN are compared with the results from gradient-based optimization (GBO) using adjoints. The optimum shape obtained from EGONN is comparable to the shape obtained from GBO and is able to eliminate the shock. The drag coefficient is reduced from 200 drag counts to 114 and is close to 110 drag counts obtained from GBO. The EGONN is also extended to handle uncertainty quantification (uqEGONN) using prediction uncertainty as an infill method. The convergence criteria is based on the relative change of summary statistics such as mean and standard deviation of an uncertain quantity. The uqEGONN is tested on Ishigami function with an initial sample size of 100 samples and the algorithm terminates after 70 infill points. The statistics obtained from uqEGONN (using only 170 function evaluations) are close to the values obtained from directly evaluating the function one million times. uqEGONN is demonstrated on to quantifying the uncertainty in the airfoil performance due to geometric variations. The algorithm terminates within 100 computational fluid dynamics (CFD) analyses and the statistics obtained from the algorithm are close to the one obtained from 1000 direct CFD based evaluations.</p>
522

Субъективное благополучие учителя в работе с нормотипичными и особенными детьми : магистерская диссертация / Subjective well-being of teachers in working with normolipidemia and special children

Жемчугова, Т. В., Zhemchugova, T. V. January 2021 (has links)
Объектом исследования является субъективное благополучие детей. Предметом исследования являются выявление особенностей субъективного благополучия учителей, работающих с нормотипичными учащимися и учителей, работающих в коррекционных школах с особенными детьми. Магистерская диссертация состоит из введения, двух глав, заключения, списка литературы (57 источников) и приложения, включающего в себя бланки применявшихся методик. Объем магистерской диссертации 87 страниц, на которых размещены 8 рисунков и 12 таблиц. Во введении раскрывается актуальность проблемы исследования, разработанность проблематики, ставятся цель и задачи исследования, определяются объект и предмет исследования, формулируются основная и дополнительные гипотезы, указываются методы и эмпирическая база, а также этапы проведения исследования, научная новизна, теоретическая и практическая значимость работы. Первая глава включает в себя обзор иностранной и отечественной литературы по теме субъективное благополучие учителя. Представлены разделы, посвященные исследованию показателей структурных составляющих субъективного благополучия и их взаимосвязей у учителей работающих с нормотипичными и особенными детьми. Выводы по первой главе представляют собой итоги по изучению теоретического материала. Вторая глава посвящена эмпирической части исследования. В ней представлено описание организации и методов проведенного исследования и результатов, полученных по всем использованным методикам: Методике диагностики субъективного благополучия личности Шамионова Р.М. и Бесковой Т.В., шкале (тест-опросник) депрессии Бека А.Т., тест на эмоциональный интеллект Холла Н.. Также в главе представлены результаты описательной статистики, корреляционного и сравнительного анализа исследования. Выводы по главе 2 включают в себя основные результаты эмпирического исследования. В заключении в обобщенном виде изложены результаты теоретической и эмпирической частей работы, а также выводы по выдвинутым гипотезам, обоснована практическая значимость исследования и описаны возможные перспективы дальнейшей разработки данной проблематики. / The object of the study is the subjective well-being of children. The subject of the study is to identify the features of the subjective well-being of teachers working with normotypic students and teachers working in correctional schools with special children. The master's thesis consists of an introduction, two chapters, a conclusion, a list of references (57 sources) and an appendix, which includes forms of the applied methods. The volume of the master's thesis is 87 pages, which contain 8 figures and 12 tables. The introduction reveals the relevance of the research problem, the development of the problem, sets the goal and objectives of the research, defines the object and subject of the research, formulates the main and additional hypotheses, specifies the methods and empirical base, as well as the stages of the research, scientific novelty, theoretical and practical significance of the work. The first chapter includes a review of foreign and domestic literature on the subject of subjective well-being of the teacher. The sections devoted to the study of indicators of the structural components of subjective well-being and their interrelationships among teachers working with normotypic and special children are presented. The conclusions of the first chapter are the results of the study of the theoretical material. The second chapter is devoted to the empirical part of the study. It describes the organization and methods of the study and the results obtained by all the methods used: Methods of diagnostics of subjective well-being of the individual Shamionova R. M. and Beskova T. V., scale (test-questionnaire) of depression Beck A. T., test for emotional intelligence Hall N., Also in the chapter the results of descriptive statistics, correlation and comparative analysis of the study are presented. The conclusions of chapter 2 include the main results of the empirical study. In conclusion, the results of the theoretical and empirical parts of the work, as well as conclusions on the hypotheses put forward, are summarized, the practical significance of the study is justified and possible prospects for further development of this problem are described. Keywords: subjective well-being, teachers, normotypic children, special children, emotional well-being, ego-well-being, hedonistic, socio-normative well-being, emotional intelligence.
523

Through the Blur with Deep Learning : A Comparative Study Assessing Robustness in Visual Odometry Techniques

Berglund, Alexander January 2023 (has links)
In this thesis, the robustness of deep learning techniques in the field of visual odometry is investigated, with a specific focus on the impact of motion blur. A comparative study is conducted, evaluating the performance of state-of-the-art deep convolutional neural network methods, namely DF-VO and DytanVO, against ORB-SLAM3, a well-established non-deep-learning technique for visual simultaneous localization and mapping. The objective is to quantitatively assess the performance of these models as a function of motion blur. The evaluation is carried out on a custom synthetic dataset, which simulates a camera navigating through a forest environment. The dataset includes trajectories with varying degrees of motion blur, caused by camera translation, and optionally, pitch and yaw rotational noise. The results demonstrate that deep learning-based methods maintained robust performance despite the challenging conditions presented in the test data, while excessive blur lead to tracking failures in the geometric model. This suggests that the ability of deep neural network architectures to automatically learn hierarchical feature representations and capture complex, abstract features may enhance the robustness of deep learning-based visual odometry techniques in challenging conditions, compared to their geometric counterparts.
524

Confusio hos Augustinus

Bårman, Erik January 2024 (has links)
Denna uppsats börjar i tänkandet hos Augustinus, som förutom med hans egen definition av tänkandet som ett samlande också ser tänkandet som ett välvande [volvere] och ett fusionerande [fusio]. Tänkandet som ett välvande sker genom att ord revolverar [revolvere]. Detta leder till upptäckten av att vara involverad [involvere] i världen. Eftersom man är involverad vill man försöka evolvera [evolvere] det i vilket man är involverad: strukturen är volvere–revolvere–involvere–evolvere. Detta hänger samman med varats utgjutning [diffusio] som ingjuts [infusio] i människorna, varför människan ur förskingring vill fusionera [fusio] sin verklighet. Ur detta uppstår confusio. Hos Augustinus bestäms människan av ett tredelat confusio: kosmologiskt som upphov, biologiskt som skam och kognitivt som förvirring. / The following thesis takes as its point of departure the implicit Augustinian view of thinking. Besides his own definition of thinking as a ”collecting” in the Confessions (and his view of thinking in On the Trinity), Augustine also suggests thinking as volving [volvere]. This kind of thinking is structured by words revolving [revolvere] in the mind. This, is suggested, by necessity leads to an involvement [involvere] in the world. The fact of being involved in the world also means striving to evolve [evolvere] that in which you are involved: the structure is volvere–revolvere–involvere–evolvere. This, in turn, is due to ”being” being diffused [diffusio], which then is infused [infusio] into human beings. As a result, the human being tries by thinking to fuse [fusio] reality from dispersion into unity. From this, confusion [confusio] emerges. Here, the structure is diffusio–infusio–fusio–confusio. The aim of this thesis is to envelope and place what for Augustine is predominantly a negative notion of confusio in the right manner as a generative and dynamic notion, structured in a threefold manner: cosmologically as origin, biologically as shame, cognitively as confusion. These being three aspects defining the ego.
525

Guidelines for a psycho-educational programme to enhance self-actualisation of retired people

Kerr, Pamela Pearl 11 1900 (has links)
The aim of this research is to develop guidelines for a psycho-educational programme to enhance the self-actualisation of retired people. To do this, an investigation was undertaken to determine how to enhance self-actualisation during retirement, through an understanding of the: • phenomenon of retirement; • concept of self-actualisation; • challenges that hamper adjustment and self-actualisation during retirement; • factors which assist retirees in overcoming challenges and achieving self-actualisation; and • the role of psycho-educational programmes in enhancing self-actualisation during retirement. The literature study sought to promote such an understanding through the investigation of writings and research findings. The qualitative investigation attempted to provide a contextual understanding of the above, through an exploration of the retirement experiences of a selected group of retirees living in George (and surrounding area), South Africa. The findings served as the basis for guidelines for a psycho-educational programme to enhance the self-actualisation of retired people. / Psychology of Education / M.Ed. (Guidance and Counselling)
526

The midlife crisis, gender, and social science in the United States, 1970-2000

Schmidt, Susanne Antje January 2018 (has links)
This thesis provides the first rigorous history of the concept of midlife crisis. It highlights the close connections between understandings of the life course and social change. It reverses accounts of popularization by showing how an idea moved from the public sphere into academia. Above all, it uncovers the feminist origins of the concept and places this in a historically little-studied tradition of writing about middle age that rejected the gendered "double standard of aging." Constructions of middle age and life-planning were not always oppressive, but often used for feminist purposes. The idea of midlife crisis became popular in the United States with journalist Gail Sheehy's Passages (1976), a critique of Erik Erikson's male-centered model of ego development and psychoanalytic constructions of gender and identity more generally. Drawing on mid-century notions of middle life as the time of a woman's entry into the public sphere, Sheehy's midlife crisis defined the onset of middle age, for men and women, as the end of traditional gender roles. As dual-earner families replaced the male breadwinner model, Passages circulated widely, read by women and men of different generations, including social scientists. Three psychoanalytic experts-Daniel Levinson, George Vaillant, and Roger Gould-rebutted Sheehy by putting forward a male-only concept of midlife as the end of a man's family obligations; they banned women from reimagining their lives. Though this became the dominant meaning of midlife crisis, it was not universally accepted. Feminist scholars, most famously the psychologist and ethicist Carol Gilligan, drew on women's experiences to challenge the midlife crisis, turning it into a sign of emotional instability, immaturity, and egotism. Resonating with widespread understandings of mental health and social responsibility, and confirmed by large-scale surveys in the late 1990s, this relegated the midlife crisis to a chauvinist cliché. It has remained a contested concept for negotiating the balances between work and life, production and reproduction into the present day.
527

Guidelines for a psycho-educational programme to enhance self-actualisation of retired people

Kerr, Pamela Pearl 11 1900 (has links)
The aim of this research is to develop guidelines for a psycho-educational programme to enhance the self-actualisation of retired people. To do this, an investigation was undertaken to determine how to enhance self-actualisation during retirement, through an understanding of the: • phenomenon of retirement; • concept of self-actualisation; • challenges that hamper adjustment and self-actualisation during retirement; • factors which assist retirees in overcoming challenges and achieving self-actualisation; and • the role of psycho-educational programmes in enhancing self-actualisation during retirement. The literature study sought to promote such an understanding through the investigation of writings and research findings. The qualitative investigation attempted to provide a contextual understanding of the above, through an exploration of the retirement experiences of a selected group of retirees living in George (and surrounding area), South Africa. The findings served as the basis for guidelines for a psycho-educational programme to enhance the self-actualisation of retired people. / Psychology of Education / M.Ed. (Guidance and Counselling)
528

Evaluation of Target Tracking Using Multiple Sensors and Non-Causal Algorithms

Vestin, Albin, Strandberg, Gustav January 2019 (has links)
Today, the main research field for the automotive industry is to find solutions for active safety. In order to perceive the surrounding environment, tracking nearby traffic objects plays an important role. Validation of the tracking performance is often done in staged traffic scenarios, where additional sensors, mounted on the vehicles, are used to obtain their true positions and velocities. The difficulty of evaluating the tracking performance complicates its development. An alternative approach studied in this thesis, is to record sequences and use non-causal algorithms, such as smoothing, instead of filtering to estimate the true target states. With this method, validation data for online, causal, target tracking algorithms can be obtained for all traffic scenarios without the need of extra sensors. We investigate how non-causal algorithms affects the target tracking performance using multiple sensors and dynamic models of different complexity. This is done to evaluate real-time methods against estimates obtained from non-causal filtering. Two different measurement units, a monocular camera and a LIDAR sensor, and two dynamic models are evaluated and compared using both causal and non-causal methods. The system is tested in two single object scenarios where ground truth is available and in three multi object scenarios without ground truth. Results from the two single object scenarios shows that tracking using only a monocular camera performs poorly since it is unable to measure the distance to objects. Here, a complementary LIDAR sensor improves the tracking performance significantly. The dynamic models are shown to have a small impact on the tracking performance, while the non-causal application gives a distinct improvement when tracking objects at large distances. Since the sequence can be reversed, the non-causal estimates are propagated from more certain states when the target is closer to the ego vehicle. For multiple object tracking, we find that correct associations between measurements and tracks are crucial for improving the tracking performance with non-causal algorithms.
529

Consumption in life transition : How do unemployed consumers behave in the marketplace?

Sihvo, Cecilia, Mesanovic, Diana January 2010 (has links)
Background: We live in a world where not everyone is employed; numerous people havelost their jobs due to several factors where one of them is the economic crisis. This has hada huge impact on Sweden and the unemployment rate. Previous research has shown thatinflation, unemployment, and high interest rates represent risks to consumer welfare. We all consume daily, or on occasions, but how do unemployed consumers consume, what do they consume and why? In this area, the authors have found a knowledge gap in literature; therefore exploring this phenomenon is of interest.   Purpose: The purpose of this study is to explore and illustrate how consumers who have experienced a life transition, from employment to unemployment, are affected by this and how it has an impact on their consumption.   Method: This is an exploratory study performed with a qualitative and an abductive approach, where the authors used primary data collection through semi-structured in-depth interviews in Swedish with 16 unemployed consumers. These unemployed consumers were selected at Arbetsförmedlingen, the public employment service, in Jönköping.   Results: By living in unemployment the consumers have been affected psychologically, physically, financially and socially. Their identity has changed for each of them since they have to adapt to the new circumstances in their life. The new life situation has had an impact on the consumer’s well-being where depression, anxiety, and a feeling of being the underdog in the society is present. Their new life situation has implied a change in their consumption behavior since they nowadays have to prioritize the basic needs. Many of the respondents used explicit and implicit shopping-list in order to reduce their impulse buying. The contribution that the authors have done to the theory of resistance is a fourth category called ‘Everyday life resistance’ which explains the behavior of people who live in unemployment, i.e. they always have to think about resisting temptations, wants, desires, and avoiding situations where the result may be unnecessary consumption. The consumers in this study are highly involved in their consumption behavior, which the authors have chosen to call ‘reversed habitual decision making’. This kind of involvement is very high despite the high- or low risk category of the product. Their new life situation has made them more aware of product alternatives, market supply, prices, and also knowledge about their own resistance in the marketplace. / Bakgrund: Vi lever i en värld där inte alla har en anställning, en omfattande andel av befolkningen har förlorat sitt jobb på grund av flera faktorer, där en av dem är den ekonomiska krisen. Detta har haft en stor påverkan på Sverige och dess arbetslöshet. Föregående studier har visat att inflation, arbetslöshet och hög räntesats representerar risk för konsumentens välbefinnande. Vi alla konsumerar dagligen eller vid speciella tillfällen, men hur konsumerar en arbetslös konsument, vad konsumerar dem och varför? Inom detta område har författarna funnit ett kunskaps gap i litteraturen, därav är en undersökning av detta fenomen av intresse.   Syfte: Syftet med denna studie är att utforska och illustrera hur konsumenter som har genomgått en livsförändring, från att ha varit anställd till att vara arbetslös, är påverkade av detta och hur detta har inverkat på deras konsumtion.   Metod: Detta är en explorativ studie genomförd med en kvalitativ och abduktiv tillvägagångssätt där författarna har använt sig av primär information samlad genom, till viss del, strukturerade djupgående intervjuer på svenska med 16 arbetslösa konsumenter. Dessa var utvalda vid Arbetsförmedlingen i Jönköping.   Resultat: Att leva som arbetslös har påverkat konsumenterna psykologiskt, fysiskt, finansiellt och socialt. Deras identitet har förändrats då de måste anpassa sig till den nya livssituationen. Den nya situationen har påverkat konsumenternas hälsa då de känner av depression, ängslan och känner sig mindre värda i samhället. Deras nya livssituation har inneburit en det förändringar i deras konsument beteende eftersom de numera måste prioritera sina primära behov. Många av studiens deltagare använde sig av explicita och implicita inköpslistor för att minimera spontanköp. Författarnas bidrag till teorin om motstånd är en fjärde kategori kallad ‘Vardagligt motstånd’ vilket förklarar beteendet hos arbetslösa personer dvs. de måste hela tiden tänka på att motstå frestelser, begär och försöka undvika situationer där onödiga inköp kan uppstå. Konsumenterna i denna studie är synnerligen involverade i sitt konsument beteende, detta har författarna valt att benämna ’omvänt rutin besluts genomförande’. Denna typ av involvering är väldigt hög oavsett om produktkategorin innebär hög- eller låg risk. Deras nya livssituation har gjort dem mer medvetna om alternativa produkter, marknadens utbud, priser och ny kunskap om deras egna motstånd inom konsumtionssamhället.
530

Consumption in life transition : How do unemployed consumers behave in the marketplace?

Sihvo, Cecilia, Mesanovic, Diana January 2010 (has links)
<p><strong>Background:</strong> We live in a world where not everyone is employed; numerous people havelost their jobs due to several factors where one of them is the economic crisis. This has hada huge impact on Sweden and the unemployment rate. Previous research has shown thatinflation, unemployment, and high interest rates represent risks to consumer welfare. We all consume daily, or on occasions, but how do unemployed consumers consume, what do they consume and why? In this area, the authors have found a knowledge gap in literature; therefore exploring this phenomenon is of interest.</p><p> </p><p><strong>Purpose:</strong> The purpose of this study is to explore and illustrate how consumers who have experienced a life transition, from employment to unemployment, are affected by this and how it has an impact on their consumption.</p><p> </p><p><strong>Method:</strong> This is an exploratory study performed with a qualitative and an abductive approach, where the authors used primary data collection through semi-structured in-depth interviews in Swedish with 16 unemployed consumers. These unemployed consumers were selected at Arbetsförmedlingen, the public employment service, in Jönköping.</p><p> </p><p><strong>Results:</strong> By living in unemployment the consumers have been affected psychologically, physically, financially and socially. Their identity has changed for each of them since they have to adapt to the new circumstances in their life. The new life situation has had an impact on the consumer’s well-being where depression, anxiety, and a feeling of being the underdog in the society is present. Their new life situation has implied a change in their consumption behavior since they nowadays have to prioritize the basic needs. Many of the respondents used explicit and implicit shopping-list in order to reduce their impulse buying. The contribution that the authors have done to the theory of resistance is a fourth category called ‘Everyday life resistance’ which explains the behavior of people who live in unemployment, i.e. they always have to think about resisting temptations, wants, desires, and avoiding situations where the result may be unnecessary consumption. The consumers in this study are highly involved in their consumption behavior, which the authors have chosen to call ‘reversed habitual decision making’. This kind of involvement is very high despite the high- or low risk category of the product. Their new life situation has made them more aware of product alternatives, market supply, prices, and also knowledge about their own resistance in the marketplace.</p> / <p><strong>Bakgrund:</strong> Vi lever i en värld där inte alla har en anställning, en omfattande andel av befolkningen har förlorat sitt jobb på grund av flera faktorer, där en av dem är den ekonomiska krisen. Detta har haft en stor påverkan på Sverige och dess arbetslöshet. Föregående studier har visat att inflation, arbetslöshet och hög räntesats representerar risk för konsumentens välbefinnande. Vi alla konsumerar dagligen eller vid speciella tillfällen, men hur konsumerar en arbetslös konsument, vad konsumerar dem och varför? Inom detta område har författarna funnit ett kunskaps gap i litteraturen, därav är en undersökning av detta fenomen av intresse.</p><p> </p><p><strong>Syfte:</strong> Syftet med denna studie är att utforska och illustrera hur konsumenter som har genomgått en livsförändring, från att ha varit anställd till att vara arbetslös, är påverkade av detta och hur detta har inverkat på deras konsumtion.</p><p> </p><p><strong>Metod:</strong> Detta är en explorativ studie genomförd med en kvalitativ och abduktiv tillvägagångssätt där författarna har använt sig av primär information samlad genom, till viss del, strukturerade djupgående intervjuer på svenska med 16 arbetslösa konsumenter. Dessa var utvalda vid Arbetsförmedlingen i Jönköping.</p><p> </p><p><strong>Resultat:</strong> Att leva som arbetslös har påverkat konsumenterna psykologiskt, fysiskt, finansiellt och socialt. Deras identitet har förändrats då de måste anpassa sig till den nya livssituationen. Den nya situationen har påverkat konsumenternas hälsa då de känner av depression, ängslan och känner sig mindre värda i samhället. Deras nya livssituation har inneburit en det förändringar i deras konsument beteende eftersom de numera måste prioritera sina primära behov. Många av studiens deltagare använde sig av explicita och implicita inköpslistor för att minimera spontanköp. Författarnas bidrag till teorin om motstånd är en fjärde kategori kallad ‘Vardagligt motstånd’ vilket förklarar beteendet hos arbetslösa personer dvs. de måste hela tiden tänka på att motstå frestelser, begär och försöka undvika situationer där onödiga inköp kan uppstå. Konsumenterna i denna studie är synnerligen involverade i sitt konsument beteende, detta har författarna valt att benämna ’omvänt rutin besluts genomförande’. Denna typ av involvering är väldigt hög oavsett om produktkategorin innebär hög- eller låg risk. Deras nya livssituation har gjort dem mer medvetna om alternativa produkter, marknadens utbud, priser och ny kunskap om deras egna motstånd inom konsumtionssamhället.</p>

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