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1
Rivas, Reguera José Carlos. "Development of AINA code for the study of loss of plasma control events in ITER and DEMO, and contribution to the systems study of DEMO". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/392607.
Testo completoAbstract (sommario):
Magnetic fusion is a long term, worldwide research activity. Plans are increasingly ambitious, cooperation is progressing, and goals seem to be closer every year. ITER reactor is being built, and several conceptual studies are being developed around the world for the design of a DEMO power plant.
A central goal of ITER is to demonstrate the safety and environmental potential of fusion as an energy source. ITER Safety studies have developed a technical safety basis for safety in nuclear fusion. DEMO safety studies take benefit from the ITER experience. In the context of safety studies for ITER and DEMO devices, AINA code is used for the calculation of plasma-wall transients and its consequences for in-vessel components.
The work of this thesis has consisted basically on the development of AINA code, from the initial existing version, and the safety studies performed with the code. Additionally, systems studies were performed in the frame of Tecno_FUS program. Also several small codes were developed in support of AINA calculations:
- SimSched, simulation scheduler, is an Excel macro for automating calculations with AINA code. It allows making large series of simulations without supervision, increasing productivity.
- Code in Matlab for calculation of view factors of arbitrary toroidal geometries, useful for configuring AINA code.
- Montecarlo code for the calculation of neutron wall loading from a plasma source.
- Python script for parametric studies with PROCESS code.
- Python script for optimisation studies with AINA code.
The following studies have been performed:
- Study of passive plasma termination for beryllium evaporation during and ex-vessel LOCA transient in ITER: the ITER reference case has been studied again, with similar results to those obtained in the past. A sensitivity study was done showing that wall surface in contact with plasma could melt before the end of plasma discharge.
- Study of Loss of Plasma Control transients in ITER: it has been shown that parametric scan method is not appropriate to find the most severe plasma transients. An optimisation method has been proposed to substitute it. The behavior of plasma transients inside the plasma operation window was investigated, including the effect of two simultaneous perturbations.
- Safety studies for Japanese DEMO, considering plasma perturbations or thermohydraulic accidents and assuming loss of plasma control: methodology for safety studies has been improved. The result of this research is useful for Japanese DEMO research program, as it gives information about the recovery time for plasma control system.
- Contribution to systems analysis to obtain optimal plasma configurations for Tecno_FUS research programme: In the frame of this project, sensitivity studies were performed with the systems code PROCESS, and a Montecarlo code was developed for the calculation of poloidal neutron wall loading for an arbitrary toroidal geometry. Results were compared with the case of ITER.
As a final conclusion, this work represents an important consolidation of the research line of AINA project.La fusión magnética ha sido y es una actividad de investigación a escala mundial y a muy largo plazo. Los objetivos son cada vez más ambiciosos, la cooperación cada vez mayor, y los objetivos parecen cada vez más cercanos. El reactor ITER se está construyendo, y varios estudios conceptuales se están desarrollando en todo el mundo para el diseño de una central de fusión nuclear conectada a la red, DEMO. Un objetivo central de ITER es demostrar el potencial de seguridad y respeto al medio ambiente de la fusión como fuente de energía. Los estudios de seguridad de ITER han desarrollado una base técnica para los estudios de seguridad en fusión nuclear. Los estudios de seguridad para DEMO se están basando actualmente en la experiencia de ITER. En el contexto de los estudios de seguridad para ITER y DEMO, el código AINA se utiliza para el cálculo de los transitorios plasma-pared y el estudio de sus consecuencias térmicas para los componentes instalados dentro de la vasija del reactor. El trabajo de esta tesis ha consistido principalmente en el desarrollo del código AINA, desde su versión inicial preexistente, y los estudios de seguridad realizados con el código. También se realizaron estudios de sistemas en el marco del programa de Tecno_FUS . Además, varios códigos de pequeña extensión se desarrollaron para apoyar el trabajo con el código AINA: - SimSched, planificador de la simulación, es una macro de Excel para automatizar los cálculos con el código de AINA. Permite hacer grandes series de simulaciones sin supervisión, lo que aumenta la productividad. - Código en Matlab para el cálculo de los factores de vista de geometrías toroidales arbitrarias, útil para configurar código AINA. - Código de Montecarlo para el cálculo de la carga neutrónica que cruza la superficie de los elementos en contacto con el plasma. - Código en lenguaje Python para estudios paramétricos con el código de sistemas PROCESS. - Código en lenguaje Python para estudios de optimización con el código AINA. Se han realizado los siguientes estudios: - Estudio del apagado pasivo del plasma por evaporación de berilio durante un accidente de pérdida de refrigerante fuera de la vasija del plasma en ITER: se ha repetido el estudio del caso de referencia, con resultados similares a los obtenidos en el pasado. Se ha realizado un estudio de sensibilidad que ha mostrado que la superficie de la pared en contacto con el plasma puede llegar a fundirse antes del fin de la descarga. - Estudio de transitorios de pérdida de control del plasma en ITER: se ha demostrado que el método de exploración paramétrica no es apropiado para encontrar los transitorios de plasma más graves. Un método de optimización se ha propuesto para sustituirlo. Se ha investigado el comportamiento de los transitorios dentro de la ventana de operación del plasma incluyendo combinaciones simultáneas de dos perturbaciones. - Estudios de seguridad para el diseño DEMO japonés, teniendo en cuenta las perturbaciones del plasma o accidentes termohidráulicos y asumiendo la pérdida de control del plasma: la metodología para los estudios de seguridad ha sido mejorada. El resultado de esta investigación es útil para el programa de investigación DEMO japonés, ya que da información sobre el tiempo de recuperación máximo para el sistema de control de plasma. - Contribución al análisis de sistemas para dar configuraciones óptimas de plasma para el proyecto Tecno_FUS: Dentro de esta actividad se realizaron estudios paramétricos con el código de sistemas PROCESS, y se desarrolló un código de Montecarlo para calcular la carga neutrónica que cruza la superficie de los elementos en contacto con el plasma para una geometría toroidal arbitraria, y comparación con resultados de ITER. El balance final en cuanto al proyecto AINA, es que este trabajo representa una consolidación importante de esta línea de investigación.
2
Breazeale, Dorothy Elizabeth. "Extinction Events". Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1427876606.
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3
Merkouris, Katherine Maria. "Decidual inflammatory events associated with early embryo loss". Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30704.
Testo completoAbstract (sommario):
The maternal immune system exerts a key role in determining the outcome of mammalian pregnancy. It has been proposed that the high rate of early embryo loss (20--30%) in DBA/2-mated CBA/J female mice may be the consequence of a maternal non-speck immune rejection response to the allogeneic conceptus. Early embryo resorption in mice has been associated with the activation of natural killer like cells, macrophages, and production of TH1 inflammatory cytokines. To investigate and detect the earliest events in the activation of decidual NK cells and macrophages in initiating early embryo loss, gene expression analysis of two NK cell molecular markers, IFNgamma and perforin mRNA, and two macrophage specific cytokines, TNFalpha and NOS mRNA, was performed. Since IFNgamma is also produced by CD4+ T cells, cell labeling with an anti-NK antibody (DX5), cell sorting, and RT-PCR gene expression analysis were performed to confirm the source of IFNgamma mRNA in the decidua and spleen of DBA/2-mated CBA/J female. The role of the innate response during implantation, normal pregnancy, and early pregnancy loss will be discussed. (Abstract shortened by UMI.)
4
Merkouris, Katherine Maria. "Decidual inflammatory events associated with early embryo loss". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0029/MQ64408.pdf.
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5
Bostander, D. E. "Operational risk events in banks and practices for collecting internal loss data". Thesis, University of South Africa, 2007. http://hdl.handle.net/10500/137.
Testo completoAbstract (sommario):
This research study had two distinct objectives. The first objective was to determine in which areas in South African banks the most severe operational risk losses are likely to occur (based on the Basel II seven loss event types and eight business lines). Severity was assessed based on single operational risk events that might have significant monetary values attached to them. The likely frequency of single operational risk events was also assessed.
The investigation of the aforementioned research problem was explorative and quantitative of nature, as the researcher made extensive use of survey research in the form of a questionnaire to all registered banks.
The second part of the research study’s objective was to assess the range of practices in collecting internal loss data for operational risk purposes as required by Basel II. This part was approached from a qualitative perspective, by benchmarking the research findings against the Basel II text, the researcher’s experience in risk management in banks, the Basel Committee on Banking Supervision’s Sound Practices for the Management and Supervision of Operational Risk, and related literature.
The literature review, including reference to certain surveys and studies, focuses on the main concepts of operational risk within banks that are pertinent to the research problem. The literature review also includes several references to the Basel II text and other relevant publications and papers issued by the Basel Committee on Banking Supervision.
The research results revealed that respondents in South African banks believed that ‘business disruption and system failures’ is the loss event type that is likely to result in the most severe single operational risk loss. ‘Trading and sales’ scored the same high average rating as ‘business disruption and system failures’ as the business line where the most severe single operational risk loss is likely to occur in South African banks.
‘External fraud’ and ‘execution, delivery and process management’ scored the highest average ratings as the loss event types where the most frequent operational risk losses are likely to occur. Respondents indicated that ‘retail banking’ is the business line where the most frequent single operational risk losses are likely to occur in South African banks. Based on the above-mentioned findings the researcher recommends that these high-risk areas be highlighted to the Bank Supervision Department of the South African Reserve Bank, the boards of directors and senior management of banks in order for them to strengthen banks’ internal controls.
The researcher recommends the inclusion of near misses and opportunity cost in operational risk loss databases. Banks should at least capture the date of the discovery of an operational risk event as this represents acceptable practice among the majority of banks. Operational risk losses should be assigned to the multiple business activities in which it occurred on a pro-rata basis. All recoveries of operational risk losses should be processed separately, but associated with the original loss event. Replacement cost is seen as the most appropriate way to capture gross loss amounts for the damage to fixed assets. The researcher encourages the recording of overtime cost for fixing systems failures. Market risk losses due to operational risk events should be treated as market risk losses, while loan-related losses due to operational risk failures should be treated as credit risk losses by banks.
The researcher’s view is that banks should set different thresholds for the collection of operational risk losses for its various business units based on each business unit’s operations and nature of business. Banks should, as a starting point, map operational risk events to the Basel II 8x7 matrix. Operational risk losses should be assessed by both legal entity and on a consolidated basis.
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Galuzio, Paulo Paneque. "Intermittent turbulence, extreme events and control techniques". reponame:Repositório Institucional da UFPR, 2016. http://hdl.handle.net/1884/43138.
Testo completoAbstract (sommario):
Orientador: Prof. Dr. Sergio Roberto LopesTese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Exatas, Curso de Pós-Graduação em Física. Defesa: Curitiba,22/02/2016
Inclui referências : f. 68-77
Resumo: A compreensão dos mecanismos dinâmicos que levam à formação de estados turbulentos em sistemas dinâmicos espacialmente estendidos constituem um dos maiores problemas da física matemática contemporânea. Observa-se que frequentemente estas transições acontecem de maneira intermitente, i.e, a dinâmica alterna de uma maneira aparentemente irregular entre estados de caos temporal e turbulentos. O estudo do início intermitente da turbulência é ainda mais importante se consideramos a aplicação em potencial na compreensão de sistemas que apresentam eventos extremos em suas evoluções temporais, há uma semelhação notável no comportamento dinâmicos de sistemas com eventos extremos e intermitência em sistemas espac ialmente estendidos. Neste trabalho, estudamos uma transição de um estado laminar para aos temporal para turbulência, que acontece de maneira intermitente, na equação de Shrödinger não-linear unidimensional forçada e amortecida. Este modelo representa vários problemas físicos distintos, particularmente oferece uma descrição precisa da dinâmica de envelope de ondas em um meio levemente não-linear, dispersivo e conservativo. As propriedades estatísticas da série temporal da energia da onda sugere que a transição acontece de acordo com um mecânismo dinâmico conhecido na literatura, que se chama intermitência co- induzida por variabilidade da dimensão instável. A análise posterior das distribuições dos expoentes de Lyapunov a tempo finito confirma que a perda de estabilidade transversal de um atrator caótico de baixa dimensionalidade, imerso no espaço de fase de Fourier, é de fato o mecânismo subjacente à intermitência, e portanto leva o sistema ao estado turbulento. Especificamente para o modelo estudado, o aumento da amplitude de forçamento induz a perda de estabilidade transversal de um atrator de baixa energia, o que leva a emergência de intermitência no sistema, e posteriormente turbulência. Adicionalmente, foi possível decompor a dinâmica nos chamados modos longitudinais, mistos e transversais. Posteriormente, mapeamos de maneira aproximada as regiões de instabilidade transversal máxima no atrator caótico de baixa dimensionalidade, e então perturbamos o sistema para inibir a ocorrência de eventos extremos intermitentes.
Abstract: The understanding of the dynamical mechanisms that lead to the formation of turbulent states in spatially extended dynamical systems constitutes a major problem in modern mathematical physics. It is observed that often these transitions o ur intermittently, i.e., the dynamics shifts in a seemingly random way between states of temporal chaos and turbulent states. The study of intermittent onset of turbulence is even more important if we consider the potential application in the understanding of systems that possess extreme events in their temporal evolution, there is a great resemblance in the behavior of extreme events dynamics and intermittent spatially extended systems. In this work, we studied a transition from a laminar state to temporal chaos to turbulence which happens in an intermittent way, in the one-dimensional for ed and damped nonlinear Shrödinger equation, a model that represents diferent physical problems, particularly it provides an accurate description of the envelope dynamics of waves in slightly nonlinear, dispersive and conservative medium. The statistical properties of the time series of the wave energy show that the transition takes place accordingly with a known dynamical behavior named in the literature as on-off intermittency induced by unstable dimension variability. The further analysis of the distribution of the finite time Lyapunov exponents confims that the loss of transverse instability of a low dimensional chaotic attractor, embedded in the Fourier phase spa e, is indeed the underlying mechanism behind the intermittency, and therefore leads the system to a turbulent state. In the specific case of the studied model, the increase in intensity of the for ing amplitude induces the loss of transverse stability in a low-energy attractor, which leads to the emergence of intermittency and then spatiotemporal chaos in the system. Additionally, we were able to successfully de compose the dynamics into the so called longitudinal, mixed and transverse modes. It was then possible to approximately map the regions of maximum transverse instability in the low-dimensional chaotic attractor, and perturb the system in order to inhibit the ocurrence of intermittent extreme events.
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Casson, Ian. "Determinants of loss of control of hypertension". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65608.pdf.
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Dongmo, Jean Etienne Temgoua Kwatny Harry G. "Aircraft loss-of-control prevention and recovery : a hybrid control strategy /". Philadelphia, Pa. : Drexel University, 2010. http://hdl.handle.net/1860/3252.
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Zhou, Kaiyu. "Packet loss models of the Transmission Control Protocol". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36873172.
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Zhou, Kaiyu, e 周開宇. "Packet loss models of the Transmission Control Protocol". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36873172.
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Murphy, Terrence Edward. "Multivariate Quality Control Using Loss-Scaled Principal Components". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11222004-122326/unrestricted/murphy%5Fterrence%5Fe%5F200412%5Fphd.pdf.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2005.Victoria Chen, Committee Co-Chair ; Kwok Tsui, Committee Chair ; Janet Allen, Committee Member ; David Goldsman, Committee Member ; Roshan Vengazhiyil, Committee Member. Vita. Includes bibliographical references.
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Olds, Kathryn Curran. "Inhibitory Control Efficiency In Successful Weight Loss Participants". ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/313.
Testo completoAbstract (sommario):
Eating unhealthy foods and eating past satiety are inappropriate behaviors that promote obesity. The ability to effectively inhibit an inappropriate behavior is a key component of cognitive restraint and its impairment has been previously linked to obesity. In this study, a Go/No-Go fMRI task was completed by a cohort of adult women that had experienced initial weight loss followed by various levels of weight regain or continued weight loss. Region of interest fMRI analysis revealed that greater total weight loss was significantly related to decreasing activation in the right inferior frontal gyrus and the right superior frontal gyrus. These results suggest that as weight loss increases fewer cognitive resources are needed in order to maintain levels of inhibitory control. This cognitive efficiency, though only partially supported by better task performance, is supported by greater exercise. An analysis of resting state patterns of correlation between task-activated regions revealed a significant correlation between the right inferior frontal gyrus and the left middle temporal gyrus. The strength of this relationship was significantly correlated with increasing total weight loss and continued weight loss over time. Cognitive restraint was also associated with this fronto-temporal correlation and provides support for cognitive efficiency. Right inferior frontal gyrus was also correlated with left inferior frontal gyrus and this relationship was positively correlated with initial weight loss suggesting that fewer neurocognitive resources were required by those who were able to achieve greater initial weight loss.
13
Ferrer, Ilyan. "Exploring older people's everyday experiences of loss in late life". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116002.
Testo completoAbstract (sommario):
Normative ideas of age and stage-based transitions are built into policies and practices related to aging. However, how the issues of loss and depression impact older people's experiences of transition are often less prevalent. This paper discusses the sub-theme of loss identified within data from the Late Life Transitions Project; a SSHRC funded research project. In this thesis, qualitative interviews were analyzed from 30 community-residing seniors from diverse social backgrounds. Focused exploration of the everyday ways in which older people discussed major transitions and turning points revealed a strong subtheme of loss. Findings presented are related to the types of loss, the various barriers to integrating loss, coping mechanisms and the impact of social location on loss. Such discussions inform understandings of the ways in which older people discuss and make sense of their loss, and may provide guidance to plan interventions that are more relevant to older people's late life experiences.
14
Porembski, Joseph Paul. "Control of start and stop events in a HEV". Connect to resource, 2007. http://hdl.handle.net/1811/28938.
Testo completoAbstract (sommario):
Thesis (Honors)--Ohio State University, 2007.Title from first page of PDF file. Document formatted into pages: contains vi, 36 p.; also includes graphics. Includes bibliographical references (p. 35). Available online via Ohio State University's Knowledge Bank.
15
Ritter, Matthew Kasai. "Genetic control of early events in plant inflorescence development /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3070994.
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Bourget, Edwin. "Diagnosing accidental and malicious events in industrial control systems". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0179.
Testo completoAbstract (sommario):
La convergence des systèmes d’informations et des systèmes industriels entraine un changement de paradigme dans la gestion des incidents accidentels et malveillants. Sûreté de fonctionnement et sécurité doivent désormais interagir, ce qui change le périmètre et les problématiques du diagnostic. Après avoir défini ce nouveau périmètre du diagnostic, cette thèse fournit une analyse des modèles existants permettant de fournir des informations nécessaires au diagnostic. Elle propose ensuite PROS²E, un nouveau modèle d’évènements sur lequel s’appuyer pour diagnostiquer des incidents dans des systèmes industriels. Il a été spécifiquement conçu pour réutiliser l’expertise déjà présente dans les différents métiers de la sûreté de fonctionnement et de la sécurité. PROS²E est ensuite amélioré pour représenter des incidents plus complexes et fournir des informations avec plus de précision. Plusieurs exemples illustrent les possibilités de diagnostic du modèleThe convergence of information and industrial systems triggered a paradigm shift in the management of malicious and accidental events.Safety and security must now interact and it changes the perimeters and the issues of diagnosis. After defining this new perimeter, this thesis provides an analysis of existing models that provide necessary informations for diagnosis. It then proposes PROS²E, a new event model upon which safety and security diagnosis can be performed in industrial systems. It was specificaly designed to exploit experience already present in the fields of safety and security management. PROS²E is then improved to represent more complex incidents and provide more accurate information. Several examples illustrate the diagnosis capacities of the model
17
Jaggi, Felix P. "An access control model based on time and events". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28945.
Testo completoAbstract (sommario):
A new access control model incorporating the notion of time and events is introduced. It allows the specification of fine-grained and flexible security policies which are sensitive to the operating environment. The system constraints, expressed in terms of access windows and obligations, are stored in extended access control lists. The addition of a capability mechanism gives another dimension of protection and added flexibility, so that the flexibility and expressive power of the system constraints is fully supported by the underlying mechanism. The approach is compared to several existing models and its' expressive power is demonstrated by showing the new model can be used to specify different existing security models as well as some special problems. The model is then adapted to work in a distributed environment.Science, Faculty of
Computer Science, Department of
Graduate
18
Edwards, Jeffrey L. "Comparative analysis of Poisson and alpha-stable distributions on frequency of operational risk loss events". Thesis, University of Phoenix, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10108197.
Testo completoAbstract (sommario):
Operational risk events have translated into billions of dollars of losses for financial and insurance institutions. A recent example of an operational risk event was the $7.2 billion trading loss of a capital markets trader, which caused the near collapse of Societe Generale Bank in 2008. The purpose of this quantitative descriptive comparative study is to aid in the decision-making process of allocating capital by examining the underlying probability models. The objective of the study was to compare the Poisson distribution to the alpha-stable probability distribution as a basis for allocating capital for the required capital reserves as mandated by Basel II. The study compares the degree for which the frequency distribution of operational risk loss events adheres to the Poisson distribution and the alpha-stable probability distributions. Using the Operational Riskdata eXchange Association (ORX) operational risk loss events dataset, the analysis within the study included goodness-of-fit tests. The intention of the goodness-of-fit hypothesis test is to identify how well data adhered to probability distributions or compare observed activities to expected activities. The ORX data includes loss figures from European, North American, and Asian financial institutions. The major results of study reveal that the ORX loss events frequencies do not adhere to the Poisson distribution. In making such a conclusion, the study supports the idea that the Poisson distribution is used incorrectly as a foundational model for frequency within operational risk
19
Rounds, Tiffany. "Male Weight Control: Crowdsourcing and an Intervention to Discover More". ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/999.
Testo completoAbstract (sommario):
Men and women have similar rates of obesity but the combined prevalence of overweight and obesity is higher among men. Men who are overweight are a high-risk group for many obesity-related chronic diseases, as they are more likely to carry excess weight in the abdomen, which is generally more harmful than weight stored in the lower body. Men are also less likely than women to perceive themselves as overweight, and thus are less likely to initiate weight loss through organized weight loss programs. On average, less than 27% of weight loss trial participants have been men.
Internet-based research is a low-cost, efficient way to produce novel hypotheses related to weight loss that may have previously escaped weight loss professionals. Additionally, incentives are an effective tool to motivate behavior change, and there is ample evidence to support the use of incentives to encourage many health-promoting behaviors, such as weight loss. The purpose our initial study was to facilitate intervention development by using crowdsourcing to detect unexpected beliefs and unpredicted barriers to male weight loss. The aim of our main study was to evaluate the impact of financial incentives to facilitate weight loss in men, delivered as part of a weight loss intervention.
Two separate studies were conducted. In the first project, participants were recruited to a crowdsourcing survey website which was used to generate hypotheses for behaviors related to overweight and obesity in men. Participants provided 21,846 responses to 193 questions. While several common themes seen in prior research were revealed such as previous health diagnoses and physical activity participation, other potential weight determinants such as dietary habits, sexual behaviors and self-perception were reported. Crowdsourcing in this context provides a mechanism to further investigate perceptions of weight and weight loss interventions in the male population that have not previously been documented. These insights will help guide future intervention design.
For the main project, a randomized trial compared the Gutbusters weight loss program (based on the REFIT program) alone with Gutbusters with escalating incentives for successful weight loss. The six-month intervention was conducted online with weekly in-person weight collections for the first 12 weeks. Gutbusters encouraged participants to make six 100-calorie changes to their daily diet, utilizing a variety of online lessons targeting specific eating behaviors. Measures included demographic information, height, weight, waist circumference, and body fat percentage.
Participants (N=102, 47. 0± 12. 3 yrs old, 32. 5 kg/m2, 80. 4% with at least two years of college) were randomized in a 1:1 ratio to Gutbusters or Gutbusters+Incentive. Significantly more Gutbusters+Incentive participants lost at least 5% of their baseline weight compared to the Gutbusters group at both 12 and 24 weeks. Similar to the aforementioned REFIT program, Gutbusters participants were able to achieve clinically significant weight loss. The Gutbusters+Incentive achieved greater rates of weight loss than the Gutbusters alone group, further supporting the value of incentives in promoting health behaviors.
20
Vaez, Sadegh. "Loss minimization control of interior permanent magnet motor drives". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22499.pdf.
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Niehorster, Diederick Christian. "Influence of hemianopic visual field loss on motor control". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45861699.
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Schlüter, Nora, Ricarda Schmidt, Rebekka Kittel, Anne Tetzlaff e Anja Hilbert. "Loss of control eating in adolescents from the community". The international journal of eating disorders (2015) 49, 4, S. 413-420, 2015. https://ul.qucosa.de/id/qucosa%3A14793.
Testo completoAbstract (sommario):
Objective: Loss of control (LOC) eating is a salient indicator of eating disorder psychopathology in adolescents and is associated with marked distress. While research has focused on the relevance of episode size, clinical significance of LOC eating frequency has rarely been explored. Therefore, this study aimed at identifying LOC eating prevalence with respect to its recurrence and associated variables in a community-based sample.
Method: Participants were 1643 adolescents, aged 12-20 years (62.4% female). Based on EDE-Q self-report, participants were categorized as those reporting recurrent (N = 156; 9.5%), non-recurrent (N = 226; 13.8%) and no LOC eating (N = 1261; 76.7%).
Results: Adolescents with recurrent LOC eating reported clinically relevant and significantly greater eating disorder psychopathology, functional impairment and distress because of LOC eating, and a significantly higher body mass index (BMI, kg/m2) than adolescents with non-recurrent and those without LOC eating.
Discussion: These results underline that LOC eating is a common eating behavior among adolescents in the community associated with clinical characteristics of eating disorders, and could therefore be a risk factor for developing full- or partial-syndrome eating disorders. Further research on the classification of eating disorders in adolescents with LOC eating and severity indicators is warranted.
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Schlüter, Nora, Ricarda Schmidt, Rebekka Kittel, Anne Tetzlaff e Anja Hilbert. "Loss of control eating in adolescents from the community". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-205822.
Testo completoAbstract (sommario):
Objective: Loss of control (LOC) eating is a salient indicator of eating disorder psychopathology in adolescents and is associated with marked distress. While research has focused on the relevance of episode size, clinical significance of LOC eating frequency has rarely been explored. Therefore, this study aimed at identifying LOC eating prevalence with respect to its recurrence and associated variables in a community-based sample.
Method: Participants were 1643 adolescents, aged 12-20 years (62.4% female). Based on EDE-Q self-report, participants were categorized as those reporting recurrent (N = 156; 9.5%), non-recurrent (N = 226; 13.8%) and no LOC eating (N = 1261; 76.7%).
Results: Adolescents with recurrent LOC eating reported clinically relevant and significantly greater eating disorder psychopathology, functional impairment and distress because of LOC eating, and a significantly higher body mass index (BMI, kg/m2) than adolescents with non-recurrent and those without LOC eating.
Discussion: These results underline that LOC eating is a common eating behavior among adolescents in the community associated with clinical characteristics of eating disorders, and could therefore be a risk factor for developing full- or partial-syndrome eating disorders. Further research on the classification of eating disorders in adolescents with LOC eating and severity indicators is warranted.
24
Bertagnoli, Troy D. "An analysis of pre-planning risk management practices utilized in residential and commercial construction projects". Online version, 2002. http://www.uwstout.edu/lib/thesis/2002/2002bertagnolit.pdf.
Testo completo
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Guion, Lindblom Maria June. "Analysis of company's loss control perceptions of workers' compensation costs and outplacement services". Online version, 2003. http://www.uwstout.edu/lib/thesis/2003/2003guionm.pdf.
Testo completo
26
Zhao, Yue. "Automatic Prevention and Recovery of Aircraft Loss-of-Control by a Hybrid Control Approach". Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458728101.
Testo completo
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Wu, Jinsong. "Integrated error and packet loss control in wireless multimedia links". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63567.pdf.
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Nguyen, Chi Dung [Verfasser]. "Loss minimization control of three-phase motors / Chi Dung Nguyen". Aachen : Shaker, 2017. http://d-nb.info/1149268948/34.
Testo completo
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Moretta, Brian Geoffrey. "Behaviour and control of single and two resource loss networks". Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/1339.
Testo completo
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Hilbert, Anja, e Anne Brauhardt. "Childhood loss of control eating over five-year follow-up". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-211353.
Testo completoAbstract (sommario):
Objective: Emerging prospective evidence from mixed samples, mostly covering short-term follow-up periods, suggests that childhood loss of control (LOC) eating predicts significant impairment in mental and physical health. This study sought to investigate the natural course of childhood LOC eating over the long term and in relation to binge eating disorder (BED) diagnosis, psychopathology, and body weight trajectory in the community.
Method: A total of 60 children (8-13 years) with LOC eating within the past three months and 60 demographically-matched children without LOC history were assessed with the Eating Disorder Examination adapted for Children and self-report questionnaires over a 5.5 year follow-up period. Missing data were imputed.
Results: Over follow-up, 38.3% of children showed persistent LOC eating, and 28.3% revealed an onset of LOC eating. Persistent LOC eating significantly predicted onset of partial-/full-syndrome BED at follow-up. Negative prognostic effects on eating disorder psychopathology, depressive symptoms, and body mass index were non-significant.
Discussion: The results indicate a moderate stability of LOC eating over the long term. LOC eating, especially if stable, was suggested as a variable risk factor of clinically relevant eating disturbances. In contrast, a prognostic value for psychopathology and body mass index was not confirmed.
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Hilbert, Anja, e Anne Brauhardt. "Childhood loss of control eating over five-year follow-up". International journal of eating disorders (2014) 47, 7, S. 758-761, 2014. https://ul.qucosa.de/id/qucosa%3A14977.
Testo completoAbstract (sommario):
Objective: Emerging prospective evidence from mixed samples, mostly covering short-term follow-up periods, suggests that childhood loss of control (LOC) eating predicts significant impairment in mental and physical health. This study sought to investigate the natural course of childhood LOC eating over the long term and in relation to binge eating disorder (BED) diagnosis, psychopathology, and body weight trajectory in the community.
Method: A total of 60 children (8-13 years) with LOC eating within the past three months and 60 demographically-matched children without LOC history were assessed with the Eating Disorder Examination adapted for Children and self-report questionnaires over a 5.5 year follow-up period. Missing data were imputed.
Results: Over follow-up, 38.3% of children showed persistent LOC eating, and 28.3% revealed an onset of LOC eating. Persistent LOC eating significantly predicted onset of partial-/full-syndrome BED at follow-up. Negative prognostic effects on eating disorder psychopathology, depressive symptoms, and body mass index were non-significant.
Discussion: The results indicate a moderate stability of LOC eating over the long term. LOC eating, especially if stable, was suggested as a variable risk factor of clinically relevant eating disturbances. In contrast, a prognostic value for psychopathology and body mass index was not confirmed.
32
Boyd, Steven J. "Hybrid Electric Vehicle Control Strategy Based on Power Loss Calculations". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34970.
Testo completoAbstract (sommario):
Defining an operation strategy for a Split Parallel Architecture (SPA) Hybrid Electric Vehicle (HEV) is accomplished through calculating powertrain component losses. The results of these calculations define how the vehicle can decrease fuel consumption while maintaining low vehicle emissions. For a HEV, simply operating the vehicle's engine in its regions of high efficiency does not guarantee the most efficient vehicle operation. The results presented are meant only to define a literal strategy; that is, an understanding as to why the vehicle should operate in a certain way under the given conditions. The literature review gives a background of hybrid vehicle control publications, and without the SPA HEV addressed or a hybrid analysis based on loss calculations between engine only and hybrid modes, there is a need for this paper. Once the REVLSE architecture and components are understood, the hybrid modes are explained. Then the losses for each hybrid mode are calculated, and both the conversion and assist efficiencies are detailed. The conversion efficiency represents the amount of additional fuel required to store a certain amount of energy in the battery, and this marginal efficiency can be higher than peak engine efficiency itself. This allows electric only propulsion to be evaluated against the engine only mode, and at low torques the electric motor is more efficient despite the roundtrip losses of the hybrid system.Master of Science
33
Palmberg, Allison. "Adolescent Girls' Experience of Binge and Loss of Control Eating". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2700.
Testo completoAbstract (sommario):
The current investigation used qualitative methodology to examine adolescent girls’ perceptions of control over their eating, as well as triggers, and consequences of binge and related eating behaviors. Focus groups were completed with 19 adolescent girls (aged 13-17, 58% African American, 41% White) who endorsed the behaviors. Responses to focus group questions were qualitatively analyzed using a grounded theory approach and constant comparison coding. Results reflected a fundamental lack of awareness of the loss of control (LOC) eating behaviors. Yet, the data did reflect a central theme of the need to affirm independence and autonomy through eating behaviors via three distinct pathways; asserting physical, emotional, and relational control with food. Each strategy produces different positive and negative consequences regarding emotions and physical sensations. This study suggests that adolescent need for autonomy interacts with a sense of feeling out of control of one’s external environment and insufficient coping mechanisms may increase susceptibility to maladaptive eating behaviors.
34
Damtie, Mellese. "Loss of biodiversity : problems of its legal control in Ethiopia". Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/67917/.
Testo completoAbstract (sommario):
This thesis is conducted on the premise that the existing legal, policy and governance frameworks are insufficient to protect biodiversity from the alarming loss it is facing now. It argues that these frameworks are crafted to conform to the dominant paradigm of anthropocentrism; a paradigm which believes that humans are the pinnacle of creation and everything on Earth, including the Earth itself destined to satisfy only the interests of humanity without having their own purpose. By showing how anthropocentric worldview conceived, developed and spread, and how this worldview managed to influence societal collective consciousness to govern the relationship established between humans and the nonhuman nature, the thesis argues that loss of biodiversity not a problem in itself. Rather it is a symptom of the underlying problem rooted in human thinking, guided by anthropocentric worldview. Anthropocentrism has become a powerful paradigm that succeeded in permeating into dominant religions, knowledge base and legal systems of countries of the world, including Ethiopia. The thesis contends that law, as mirror of dominant paradigms and perceptions, reflects the values of these paradigms, at international as well as national levels putting protection of biodiversity within the interpretations of these paradigms. It argues that the human treatment of the natural environment is on a scale of violence which puts the survival of humans and that of the environment at a precarious condition. Based on evidence from the review of evolutionary science and the Holy Scriptures, the thesis argues that humans are deeply connected to and dependent on the Earth systems and are responsible to maintain these systems which are functioning in a holistic manner to support all life on Earth. Promoting the proposition of Thomas Berry that the Earth is a community of subjects not a collection of objects, it contends that biodiversity has intrinsic value in addition to instrumental value, deserving ethical extension. Drawing on these concepts, the thesis suggests, by adopting a reformist approach, a shift from the reductionist notion of anthropocentrism to ecocentrism via the new philosophy called Earth jurisprudence. Earth jurisprudence is believed to correct and heal the conflicting relationship that humans established with the nonhuman nature, with the view to reconciling the present legal, policy and governance systems which have been dominated by anthropocentric perspectives. Through the vehicle of Earth jurisprudence, it is hoped that humans assume a stewardship responsibility for the mutual benefits of humans and nonhuman nature. The thesis finally deals with a case study conducted in Sheka zone in the Southwest Ethiopia. The case study is done with the purpose of exploring the TEG systems of indigenous/local communities which are believed to conform to the tenets of the Earth jurisprudence, the philosophy of law which is chosen by this work to guide the protection of biodiversity. The case study came out with findings that the Sheka TEG systems are good examples of customary practices that provide better protection for biodiversity. Exemplary lessons can be drawn from the Sheka TEG systems to amend the dominant legal, policy and governance regimes.
35
Alisic, Rijad. "Privacy of Sudden Events in Cyber-Physical Systems". Licentiate thesis, KTH, Reglerteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299845.
Testo completoAbstract (sommario):
Cyberattacks against critical infrastructures has been a growing problem for the past couple of years. These infrastructures are a particularly desirable target for adversaries, due to their vital importance in society. For instance, a stop in the operation of a critical infrastructure could result in a crippling effect on a nation's economy, security or public health. The reason behind this increase is that critical infrastructures have become more complex, often being integrated with a large network of various cyber components. It is through these cyber components that an adversary is able to access the system and conduct their attacks. In this thesis, we consider methods which can be used as a first line of defence against such attacks for Cyber-Physical Systems (CPS). Specifically, we start by studying how information leaks about a system's dynamics helps an adversary to generate attacks that are difficult to detect. In many cases, such attacks can be detrimental to a CPS since they can drive the system to a breaking point without being detected by the operator that is tasked to secure the system. We show that an adversary can use small amounts of data procured from information leaks to generate these undetectable attacks. In particular, we provide the minimal amount of information that is needed in order to keep the attack hidden even if the operator tries to probe the system for attacks. We design defence mechanisms against such information leaks using the Hammersley-Chapman-Robbins lower bound. With it, we study how information leakage could be mitigated through corruption of the data by injection of measurement noise. Specifically, we investigate how information about structured input sequences, which we call events, can be obtained through the output of a dynamical system and how this leakage depends on the system dynamics. For example, it is shown that a system with fast dynamical modes tends to disclose more information about an event compared to a system with slower modes. However, a slower system leaks information over a longer time horizon, which means that an adversary who starts to collect information long after the event has occured might still be able to estimate it. Additionally, we show how sensor placements can affect the information leak. These results are then used to aid the operator to detect privacy vulnerabilities in the design of a CPS. Based on the Hammersley-Chapman-Robbins lower bound, we provide additional defensive mechanisms that can be deployed by an operator online to minimize information leakage. For instance, we propose a method to modify the structured inputs in order to maximize the usage of the existing noise in the system. This mechanism allows us to explicitly deal with the privacy-utility trade-off, which is of interest when optimal control problems are considered. Finally, we show how the adversary's certainty of the event increases as a function of the number of samples they collect. For instance, we provide sufficient conditions for when their estimation variance starts to converge to its final value. This information can be used by an operator to estimate when possible attacks from an adversary could occur, and change the CPS before that, rendering the adversary's collected information useless.De senaste åren har cyberanfall mot kritiska infrastructurer varit ett växande problem. Dessa infrastrukturer är särskilt utsatta för cyberanfall, eftersom de uppfyller en nödvändig function för att ett samhälle ska fungera. Detta gör dem till önskvärda mål för en anfallare. Om en kritisk infrastruktur stoppas från att uppfylla sin funktion, då kan det medföra förödande konsekvenser för exempelvis en nations ekonomi, säkerhet eller folkhälsa. Anledningen till att mängden av attacker har ökat beror på att kritiska infrastrukturer har blivit alltmer komplexa eftersom de numera ingår i stora nätverk dör olika typer av cyberkomponenter ingår. Det är just genom dessa cyberkomponenter som en anfallare kan få tillgång till systemet och iscensätta cyberanfall. I denna avhandling utvecklar vi metoder som kan användas som en första försvarslinje mot cyberanfall på cyberfysiska system (CPS). Vi med att undersöka hur informationsläckor om systemdynamiken kan hjälpa en anfallare att skapa svårupptäckta attacker. Oftast är sådana attacker förödande för CPS, eftersom en anfallare kan tvinga systemet till en bristningsgräns utan att bli upptäcka av operatör vars uppgift är att säkerställa systemets fortsatta funktion. Vi bevisar att en anfallare kan använda relativt små mängder av data för att generera dessa svårupptäckta attacker. Mer specifikt så härleder ett uttryck för den minsta mängd information som krävs för att ett anfall ska vara svårupptäckt, även för fall då en operatör tar till sig metoder för att undersöka om systemet är under attack. I avhandlingen konstruerar vi försvarsmetoder mot informationsläcker genom Hammersley-Chapman-Robbins olikhet. Med denna olikhet kan vi studera hur informationsläckan kan dämpas genom att injicera brus i datan. Specifikt så undersöker vi hur mycket information om strukturerade insignaler, vilket vi kallar för händelser, till ett dynamiskt system som en anfallare kan extrahera utifrån dess utsignaler. Dessutom kollar vi på hur denna informationsmängd beror på systemdynamiken. Exempelvis så visar vi att ett system med snabb dynamik läcker mer information jämfört med ett långsammare system. Däremot smetas informationen ut över ett längre tidsintervall för långsammare system, vilket leder till att anfallare som börjar tjuvlyssna på ett system långt efter att händelsen har skett kan fortfarande uppskatta den. Dessutom så visar vi jur sensorplaceringen i ett CPS påverkar infromationsläckan. Dessa reultat kan användas för att bistå en operatör att analysera sekretessen i ett CPS. Vi använder även Hammersley-Chapman-Robbins olikhet för att utveckla försvarslösningar mot informationsläckor som kan användas \textit{online}. Vi föreslår modifieringar till den strukturella insignalen så att systemets befintliga brus utnyttjas bättre för att gömma händelsen. Om operatören har andra mål den försöker uppfylla med styrningen så kan denna metod användas för att styra avvängingen mellan sekretess och operatorns andra mål. Slutligen så visar vi hur en anfallares uppskattning av händelsen förbättras som en funktion av mängden data får tag på. Operatorn kan använda informationen för att ta reda på när anfallaren kan tänka sig vara redo att anfalla systemet, och därefter ändra systemet innan detta sker, vilket gör att anfallarens information inte längre är användbar.
QC 20210820
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ZEVALLOS, OSCAR CUARESMA. "LOSS OF CONTROL AND INADEQUATE VOLTAGE CONTROL ACTION IN THE EVALUATION OF VOLTAGE STABILITY CONDITIONS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23994@1.
Testo completoAbstract (sommario):
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Esta pesquisa está relacionada à avaliação das condições de estabilidade de tensão em pontos de operação do sistema elétrico. A modelagem de geradores / compensadores síncronos e compensadores estáticos são analisadas. Estabeleceram-se os melhores modelos com controle de tensão ativo e com perda do controle. A questão da adequação do controle de tensão foi tratada através da análise dos elementos da matriz de sensibilidade entre as grandezas controladoras e as tensões controladas. Os índices de estabilidade de tensão foram calculados. Em todos os casos, a perda de controle de tensão tem impacto negativo sobre as condições de estabilidade de tensão. Nos casos com ação de controle inadequada, independe da relação inversa entre grandeza controladora e tensão controlada, um aumento da tensão na barra controlada teve um impacto positivo sobre as condições de estabilidade de tensão, e uma diminuição da tensão na barra controlada teve impacto negativo sobre as condições de estabilidade de tensão. Esse é o resultado esperado também quando a ação de controle é adequada.
This research is related to the evaluation of voltage stability conditions of operating points of the power system. It has been studied the modelling of synchronous generators/synchronous compensators and static var compensators. The best models were established with active voltage control and with loss of control. The issue of voltage control was treated through analysis of the matrix sensitivity elements between the controlling variables and voltages at controlled buses. The voltage stability indexes were evaluated. In all cases, control loss proved to have a negative impact on voltage stability conditions. In cases with inadequate control action, results are non-dependent of the opposed relation between the controlling variable and voltage at controlling bus, an increase on voltage at controlled busbar proved to have a positive impact on voltage stability conditions, and a decrease on voltage at controlled busbar proved to have a negative impact on voltage stability conditions. This is also expected when the control action is appropriate.
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Perrin, Christopher J. "FURTHER ANALYSIS OF VARIABLES THAT AFFECT SELF-CONTROL WITH AVERSIVE EVENTS". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1277816514.
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Chuang, Wen-Cheng. "Time series modeling in water loss". Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183042019.
Testo completo
39
Hodgson, Kim Andree. "Making sense of (from) catastrophe". Thesis, Brunel University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246148.
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Domingo, Rodriguez Laura 1992. "Neurobiological mechanisms involved in the loss of control over food intake". Doctoral thesis, Universitat Pompeu Fabra, 2020. http://hdl.handle.net/10803/668410.
Testo completoAbstract (sommario):
The easy access to palatable foods is a major contributing factor for compulsive eating and development of food addiction, a disorder closely linked to obesity and binge eating disorder. The concept of food addiction is still controversial but a validated tool for diagnosis, the Yale food addiction scale (YFAS 2.0), is widely accepted. However, the complex multifactorial nature of this disorder and the unknown neurobiological mechanistic correlation explain the current lack of effective treatments. In this thesis, we used a food addiction mouse model to elucidate the crucial role of the glutamatergic cortico‐striatal pathways modulated by the endocannabinoid and the dopamine systems as a critical mechanism for the loss of inhibitory control for palatable food seeking. This result was supported by electrophysiological recordings, genome‐wide RNA and DNA methylome sequencing, chemogenetic interference and adenoviral gene delivery, giving an understanding of the food addiction construct at genetic, epigenetic, cellular, circuit and behavioral level. This thesis unravels a new neurobiological mechanism underlying resilience and vulnerability to develop food addiction, which is expected to pave ways for novel interventions to battle compulsive eating behavior and other related disorders.El fàcil accés a aliments altament saborosos és un factor important que contribueix a la ingesta compulsiva i al desenvolupament de l’addicció al menjar. Aquest trastorn està molt vinculat a l’obesitat i al trastorn per afartament. El concepte d’addicció al menjar és controvertit, però l’aparició d’una eina diagnòstica valida, el Yale food addiction scale (YFAS 2.0), ha sigut àmpliament acceptada. Tot i això, la naturalesa complexa i multifactorial d’aquest trastorn i la desconeguda correlació neurobiològica expliquen la manca actual de tractaments efectius. En aquesta tesi, hem utilitzat un model d’addicció al menjar en ratolins per descobrir el paper crucial de les vies cortico‐estriatals glutamatergiques modulades pels sistemes endocannabinoid i dopaminèrgic com a mecanisme clau per a la pèrdua del control inhibitori en la cerca d’aliments saborosos. Aquest resultat, amb el suport d’estudis electrofisiològics, seqüenciació d’ARN i d’ADN de tot el genoma i tècniques de “chemogenetics” ens donen una comprensió del trastorn a nivell genètic, epigenètic, cel·lular, de circuit i de comportament. Aquesta tesi revela un nou mecanisme neurobiològic subjacent a la resiliència i a la vulnerabilitat a desenvolupar addicció al menjar. S’espera que obri noves vies eficients d’intervenció per combatre el comportament d’ingesta compulsiva i altres trastorns relacionats.
41
Wimmer, Birgit [Verfasser]. "The Effects of Loss of Control on Risk Taking / Birgit Wimmer". Konstanz : Bibliothek der Universität Konstanz, 2011. http://d-nb.info/1044532971/34.
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Hogancamp, II Charles Everett. "Loss of Sympathetic Control of Cardiovascular Function Following Spinal Cord Injury". UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/198.
Testo completoAbstract (sommario):
Cardiovascular control in the human is significantly impaired after spinal cord injury(SCI) having a direct effect on the sympathetic nervous system (SNS) causing an inability toregulate vasoconstriction below the level of the lesion. The effects of SCI on the two majorcomponents of blood pressure regulation, control of plasma volume and neural control of theheart and peripheral vasculature are poorly understood. In particular, no index to diagnosedisorders to autonomic control of the heart and vasculature has been developed. The presentstudy primarily utilized noninvasively acquired, easily accessible variables that may havepromise as indicators of autonomic activity for assessing the level of autonomic injury andrecovery of visceral control following SCI. The most significant results and the clearestdifferences between the three groups (able-bodied, paraplegic and tetraplegic) were evident inspectral analysis obtained in the frequency domain: Arterial blood pressure and lower body (at aregion on the shin) skin perfusion spectral power in the low frequency (LF) region are ofsignificance. These variables could be good discriminators of the three groups, as well as showlevel of SCI and autonomic function.
43
Morgan, R. J. "An investigation into loss of cell-cycle control in oesophageal carcinoma". Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263930.
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Amenabar, Katharine. "Closed loop system identification of postural control with bilateral vestibular loss". College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9686.
Testo completoAbstract (sommario):
Thesis (M.A.) -- University of Maryland, College Park, 2009.Thesis research directed by: Dept. of Kinesiology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
45
Wilson, Brian Christopher David. "Control Designs for Low-Loss Active Magnetic Bearing: Theory and Implementation". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04122004-133631/unrestricted/wilson%5Fbrian%5Fc%5F200405%5Fphd.pdf.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2004.Habetler, Thomas, Committee Member ; Sadegh Nader, Committee Member ; Taylor David, Committee Member ; Tsiotras Panagiotis, Committee Co-Chair ; Heck-Ferri Bonnie, Committee Co-Chair. Vita. Includes bibliographical references (leaves 319-326).
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Layos, Aaron J. "Active control methods for improving the insertion loss of acoustical enclosures". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05022009-040407/.
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Oh, Tchang-hun. "Control of lateral diffraction loss in vertical-cavity surface-emitting lasers /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
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Kluberg, Lionel J. (Lionel Jonathan). "Competition and loss of efficiency : from electricity markets to pollution control". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67766.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 221-230).
The thesis investigates the costs and benefits of free competition as opposed to central regulation to coordinate the incentives of various participants in a market. The overarching goal of the thesis is to decide whether deregulated competition is beneficial for society, or more precisely, in which context and under what market structure and what conditions deregulation is beneficial. We consider oligopolistic markets in which a few suppliers with significant market power compete to supply differentiated substitute goods. In such markets, competition is modeled through the game theoretic concept of Nash equilibrium. The thesis compares the Nash equilibrium competitive outcome of these markets with the regulated situation in which a central authority coordinates the decision of the market participants to optimize social welfare. The thesis analyzes the impact of deregulation for producers, for consumers and for society as a whole. The thesis begins with a general quantity (Cournot) oligopolistic market where each producer faces independent production constraints. We then study how a company with multiple subsidiaries can reduce its global energy consumption in a decentralized manner while ensuring that the subsidiaries adopt a globally optimal behavior. We finally propose a new model of supply function competition for electricity markets and show how the number of competing generators and the electrical network constraints affect the performance of deregulation.
by Lionel J. Kluberg.
Ph.D.
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Winterborne, Dave Edson. "Real-time model-based loss minimisation control for electric vehicle drives". Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2972.
Testo completoAbstract (sommario):
Environmental concern and the opportunity for commercial gain are two factors driving the expansion of the electric vehicle (EV) market. Due to the limitations of current battery technology, the efficiency of the traction drive, which includes the electric motor and power electronic converter, is of prime importance. Whilst electric machines utilising permanent magnets (PMs) are popular due to their high energy density, industry concerns about the security of supply have led to interest in magnet-free solutions. Induction machines (IMs) offer such an option. Control of IMs is a mature but complex field. Many techniques for optimising the efficiency of the drive system have been proposed. The vast majority of these methods involve an analytical study of the system to reveal relationships between the controlled variable and efficiency, allowing the latter to be optimised. This inevitably involves simplifications of the problem to arrive at a practically-implementable control scheme. What has not been investigated is real-time calculation of the system losses in order to optimise the efficiency, and the work presented in this thesis attempts to achieve this. The conventional control scheme is examined and a new structure implemented where a model of the system loss is able to directly influence the switching action of the inverter, thus reducing loss. The need to maintain performance alongside loss minimisation is recognised and a cost function-based solution proposed. The validation of this structure is performed both in simulation and on a practical test platform. A model of the principle losses in the drive system is derived, taking into account the processing power typically available for this application, and implemented in the structure outlined. The effect of the new control scheme on efficiency is investigated and results show gains of up to 3%-points are achievable under certain conditions.
50
Lambiri, Cristian. "On the estimation and control of packet loss for VPN services". Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/28992.
Testo completoAbstract (sommario):
Virtual Private Services (VPN) are an important service offering for any service provider. It can be justified that in a metro environment some networks will carry only such traffic. In addition, metro networks are characterized by small link spans, which make the propagation delays negligible. In this environment, this dissertation proposes and investigates a service aware network control platform for packet switched networks that is technology agnostic.
The basic premises of our work are that VPN are provider based, have well defined QoS behavior specified by the long term loss, and have a degree of user-controllability.
The dissertation proposes a number of aggregate traffic loss estimators, based on the theory of large deviations. Our assumptions are that the buffers at each multiplexor are finite, and therefore the loss ratios are computed. It has been noted that large deviations based estimators can be estimated in two main ways: (1) assuming a traffic model and by computing the loss using that model (2) estimating the moment generating function directly.
The work compares, through a large number of simulations, the performance of the proposed estimators in both cases. The results show that under the Gaussian model the model-based estimation is very accurate. This conclusion is important because the model-based estimator has better computational complexity when compared with the modeless estimator. Therefore, it is better to be used in practice.
The dissertation proposes a new method for atomically admitting VPN service instances in the network. Dubbed Service Admission Control, this generalizes the classical admission control methods by using an atomic operation over a set of class of service instances. Furthermore, we propose and investigate a method for dynamic loss control that is of use when the traffic injected in the network has long timescale changes.