This thesis examined how international students experience life in the UK and, in particular, how these students respond to experiences with discrimination and social exclusion. Specifically, we drew on the rejection-identification model (Branscombe et al., 1999) in order to examine the impact of minority group identification as a coping strategy against perceptions of discrimination. Despite the number of studies supporting the rejection-identification model (e.g. Schmitt et al., 2002, Schmitt et al., 2003), discrepant findings were found in other research (e.g. McCoy & Major, 2003; Eccleston & Major, 2006). In order to solve these inconsistencies we proposed to extend this model in two important ways. Firstly, building on important work on the multidimensionality of social identification (e.g. Cameron & Lalonde, 2001; Ellemers et al., 1999; Jackson, 2002), we argued that a multidimensional perspective of the rejection-identification model is fundamental given that different dimensions of social identification (i.e. ingroup affect, centrality, and ingroup ties) have different effects on psychological well-being. Secondly, we hypothesised that the protective effect of the different dimensions of social identification depended upon individual preferences, beliefs and behaviours towards own and host group (i.e. acculturation strategies). These two extensions to the rejection-identification model were tested longitudinally with a sample of 160 international students. Results indicated that none of the dimensions of social identification serve to protect students from the harmful effects of discrimination. Indeed, support was found for the argument that it is important to investigate possible moderators of the rejection-identification relationship. Our results also indicated that when international students perceive discrimination, a separation strategy allows them to maintain ingroup affect, and in this way protect their self-esteem. Integration, marginalisation, and assimilation strategies were associated with lower ingroup affect leaving these students without a successful strategy to cope with discrimination. Although the aim of this thesis was to examine the experiences of international students, in Chapter 7 we replicated our previous model with a sample of Polish immigrants (N = 66) in order to test whether our results could be generalised to other minority groups. Results supported the previous findings with international students. Finally, the discussion of this thesis focused on the importance of taking into account individual acculturation strategies in order to understand the relation between perceived discrimination, minority group identification, and well-being. We also focused on how the knowledge generated by this research may support international students.

We examine the effect of joint custody on marriage, divorce, fertility and female employment in Austria using individual-level administrative data, covering the entire population. We also use unique data obtained from court records to analyze the effect on post-divorce outcomes. Our estimates show that joint custody significantly reduces divorce and female employment rates, significantly increases marriage and marital birth rates, and leads to a substantial increase in the total money transfer received by mothers after divorce. We interpret these results as evidence against Becker-Coase bargains and in support of a mechanism driven by a resource redistribution that favors men giving them greater incentives to invest in marriage specific capital. (authors' abstract) / Series: Department of Economics Working Paper Series

The overall objective of this study was to develop and characterise new normoxic polymer gel formulations for evaluation of complex 3-D treatment volumes for application in radiotherapy dosimetry. Throughout this thesis, the essential characteristics of normoxic polymer gels have been extensively investigated. Studies were performed on the chemical components of the MAGIC gel and an improved formulation was proposed. Various anti-oxidants were studied and different versions of the MAGIC gel with fewer chemicals were developed and named MAGAS and MAGAT gel dosimeters. The ascorbic acid anti-oxidant was found to have a slow oxygen scavenging rate and therefore a delay period between manufacture and irradiation of the MAGAS gel was necessary before the gel became radiation sensitive. Vacuum pumping on the MAGAS gel solution to remove dissolved oxygen was shown to initially increase the R2-dose response and sensitivity of the dosimeter, reducing the time between manufacture and irradiation. Studies of the MAGAS gel for measurement of depth dose showed that MAGAS gel has potential as a clinical radiotherapy dosimetry tool. The radiological properties of MAGIC, MAGAS and MAGAT gels were investigated. Due to their high gelatine and monomer concentration, differences with water were observed for the cross-section ratios for attenuation, energy absorption and collision stopping power coefficient ratios through the therapeutic energy range. It was determined that when using and developing normoxic polymer gels the most important consideration for radiological water equivalence are the mass and relative electron densities. A preliminary study was performed with the hypoxic PAG gel dosimeter combined with tetrakis (hydroxymethyl) phosphonium chloride anti-oxidant to form a normoxic PAG gel dosimeter named PAGAT gel. It was found PAGAT gel compared favourably with previous studies of the hypoxic PAG gel. An extensive study was subsequently undertaken in which PAGAT gel was investigated for a number of essential characteristics. The PAGAT gel formulation showed potential as a normoxic polymer gel for clinical radiotherapy dosimetry, which has a significantly reduced manufacturing time and procedure compared with the hypoxic PAG gel dosimeter. The radiological attenuation properties of the PAGAT and MAGAT gels were investigated as a feasibility study for using x-ray computerised tomography (CT) as an evaluation technique of normoxic polymer gels. CT was shown to have potential as an evaluation tool for measuring the dose response of normoxic polymer gel dosimeters. An investigation was performed on the CT diagnostic dose response of normoxic polymer gels. Normoxic polymer gels were found to have potential for use as a specialised tool in measuring computerised tomography dose index (CTDI) for acceptance testing and quality assurance of CT scanners in diagnostic radiology. These findings provide a significant contribution toward the development and successful implementation of normoxic polymer gel dosimetry to clinical radiotherapy.

Made available in DSpace on 2015-08-19T13:52:55Z (GMT). No. of bitstreams: 2 3.pdf: 1059229 bytes, checksum: 39be1eda6ee4a190cf2e3aaa8add3d0d (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2012 / Fundação Oswaldo Cruz. Instituto de Tecnologia em Fármacos/Farmanguinhos. Rio de Janeiro, RJ, Brasil. / O processo de desenvolvimento de um medicamento (PD) é vital para a funcionalidade do insumo farmacêutico ativo (IFA), pois estabelece a forma farmacêutica, a formulação e o processo de produção, viabilizando sua função terapêutica. Cabe pontuar a íntima relação que o PD tem com a etapa de solicitação de registro do medicamento junto à Agência Nacional de Vigilância Sanitária (ANVISA), visto que o mesmo subsidia a produção de lotes piloto, indispensáveis a esta solicitação, e diversas informações necessárias à estruturação documental.Entretanto, ainda que dotado de tais importâncias, em âmbito nacional, o setor regulado não dispõe de qualquer diretriz específica que oriente a condução do PD. Logo, o PD é norteado pelas exigências contidas nas regulamentações direcionadas à solicitação de registro. Esta dissertação objetiva avaliar, para o PD, a extensão da adesão das regulamentações sanitárias, emanadas pela ANVISA, que dispõem sobre a concessão de registro de medicamentos novos, genéricos e similares, atualmente vigentes, com os reques itos internacionais apresentados pela International Conference on Harmonization (ICH). Para tanto, é realizada uma comparação e contextualização por assunto (IFA, excipientes, formulação, processo produtivo, sistema de acondicionamento, atributos microbiológicos e compatibilidade com diluentes de reconstituição) das regulamentações mencionadas, com o Guia da ICH, especificamente, direcionado ao PD –Guia ICH Q8(R2). O princípio do Guia ICH Q8(R2), denominado Qualiy by Design(QbD), usado para a condução do PD, consiste na estruturação do mesmo segundo uma metodologia sistemática, científica, baseada na avaliação do risco, que parte da definição das características ideais de qualidade para o medicamento. Esta estruturação prevê o pleno conhecimento do medicamento, de seu processo de obtenção e controles. Este Guia também fomenta a construção do Design Space (DS), que se estabelece pela avaliação multivariada dos insumos e parâmetros do processo e a influência da variação sobre as características de qualidade do medicamento. Os resultados provenientes da comparação das regulamentações nacionais tratadas nesta dissertação com o Guia ICH Q8(R2), evidenciam que o QbD e a construção do DS não figuram nestas regulamentações. Assim , as divergências entre o Guia ICH Q8(R2) e as regulamentações superam em quantidade e qualidade as coincidências, evidenciando significativo distanciamento, no que tange o PD, entre as regulamentações nacionais de registro considerada se o pensamento internacional, representado pela ICH. / The process of developing a product (PD) is vital to the functionality of the active pharmaceutical ingredient (API), for determining the dosage form, formulation and production process, allowing their therapeutic function. It punctuate the close relationship that the PD has with the step of applying for registration of the drug by Agência Nacional de Vigilância Sanitária(ANVISA -Brazilian equivalent to FDA), since it subsidizes the production of pilot batches, which are essential to this request, and various information necessary for structuring documents. However, although endowed with such sums,the regulated sector has no specific guidelines to conduct of the PD. Therefore, the PD is guided by the requirements contained in regulations aimed at the registration request. This thesis aims to evaluate, for the PD, the extent of adherence of health regulations, issued by ANVISA, which provide for the granting of registration of new drugs, generic and similar currently in force, with the international requisites established by the International Conference on Harmonization (ICH). Therefore,it was done a comparison by subject (API, excipients, formulation, production process, packaging system, microbiological attributes and compatibility with diluents for reconstitution) of the regulations m entioned, with the ICH guide, specifically directed to PD -ICH Q8(R2). The principle of the ICH Q8(R2), called the Quality by Design (QbD), used to drive the PD, consists on scientific systematic methodology and risk assessment based on the definition of ideal drug quality characteristics. This structure provides the knowledge of medicine, of the production process and controls. This guide also encourages the construction of the Design Space (DS), which is established by multivariate assessment of inputs and process parameters and the influence of variation on the product quality.The results from the comparison of national regulations in this dissertation dealt with the Guide ICH Q8(R2), shown that the QBD and construction of the DS are not included in these regulations. Thus, the differences between the Guide ICH Q8(R2) and the regulations exceed in quantity and quality of the matches, showing a significant gap in relation to PD, between the national record and considered international thought, represented by the ICH.

This diploma thesis deals with the possibility of presentation data in business intelligence (BI) applications. The aim is to develop a methodology for reporting and data visualization using Microsoft SQL Server 2008 Business Intelligence Development Studio and Microsoft Excel 2010. Evaluate and identify opportunities for data display using the perception of information at a subconscious level in the above mentioned tools. Identify market trends from the perspective of business intelligence data visualization. In the first part thesis focuses on the analysis of the current BI market with regard to trends in data visualization. In the following part options of perceptions on a subconscious level are examined, which are then reflected in the establishment of a methodology reporting. Similarly, it is investigated the human perception of color. Presented are appropriate and inappropriate data visualization forms, at the most commonly used graphic forms. The work describes a method to ensure that the data will not be displayed tendentiously or distorted. My contribution is creating a reporting methodology that respects the life cycle of the report, as well as a logical follow-up steps to project management.

Traditional latent class analysis (LCA) considers entropy R2 as the only measure of effect size. However, entropy may not always be reliable, a low boundary is not agreed upon, and good separation is limited to values of greater than .80. As applications of LCA grow in popularity, it is imperative to use additional sources to quantify LCA classification accuracy. Greater classification accuracy helps to ensure that the profile of the latent classes reflect the profile of the true underlying subgroups. This Monte Carlo study compared the quantification of classification accuracy and confidence intervals of three effect sizes, entropy R2, I-index, and Cohen’s d. Study conditions included total sample size, number of dichotomous indicators, latent class membership probabilities (γ), conditional item-response probabilities (ρ), variance ratio, sample size ratio, and distribution types for a 2-class model. Overall, entropy R2 and I-index showed the best accuracy and standard error, along with the smallest confidence interval widths. Results showed that I-index only performed well for a few cases.

This master’s thesis dissertate the possibilities of the linkage between Asterisk softswitch and the 4th generation private branch exchange. This should create a new generation’s network, so-called NGN, by the convergence of existing telecommunication networks with an IP computer network. This master’s thesis is divided into several chapters. In introduction is described the evolution of the private branch exchanges as well as the principles of the voice digitizing, codecs and signaling commonly used in both TDM and VoIP networks. The main aim of this project is the configuration of Asterisk software exchange for connection with PBX Alcatel 4400 as well as public phone network PSTN. Another goal of this master’s thesis was the configuration of Alcatel PBX and diagnostics of CCS and CAS signaling on E1 interface. In conclusion there are summarized advantages of NGN networks and their utilization in the future.

<p dir="ltr">Manganese (Mn) is an essential trace element for humans that functions primarily as a coenzyme in several biological processes such as nerve and brain development, energy metabolism, bone growth and development, as well as cognitive functioning. However, overexposure to environmental Mn via occupational settings or contaminated drinking water can lead to toxic effects on the central nervous systems and cause a Parkinsonian disorder that features symptoms such as fine motor control deficits, dystonia rigidity, speech and mood disturbances, and cognitive deficits summarized under the term “manganism”. Over time, Mn exposure has shifted from acute, high-level instances leading to manganism, to low-level chronic exposure. Considering that Mn exposure is significantly lower than in the past, it is unlikely to expect manganism from chronic Mn exposure under current working conditions. Therefore, there is a need to develop sensitive methods to aid in updating the clinical diagnostic standards for manganism and Mn neurotoxicity as chronic exposure to Mn leads to more subtle symptoms.</p><p><br></p><p dir="ltr">Historically, magnetic resonance imaging (MRI) has been used as a non-invasive tool for detecting excess brain Mn accumulation. Specifically, T1-weighted images show bilateral hyperintensities of the globus pallidus (GP) due to the paramagnetic properties of Mn which increases the MR relaxation rate R1. Although the GP is considered the hallmark of excess brain Mn, this brain area is not necessarily associated with symptoms, exposure, or neuropsychological outcomes. Thus, the focus should not be on the GP only but on the entire brain. With recent advances in quantitative MRI (qMRI), whole brain mapping techniques allow for the direct measurement of relaxation rate changes due to Mn accumulation. The work in this dissertation uses such quantitative techniques and network science to establish novel computational in vivo imaging methods to a) visualize and quantify excess Mn deposition at the group and individual level, and b) characterize the toxicokinetics of excess brain Mn accumulation and the role of different brain regions in the development of neurotoxicity effects.</p><p><br></p><p dir="ltr">First, we developed a novel method for depicting excess Mn accumulation at the group level using high-resolution R1 relaxation maps to identify regional differences using voxel-based quantification (VBQ) and statistical parametric mapping. Second, we departed from a group analysis and developed subject-specific maps of excess brain Mn to gain a better understanding of the relationship between the spatial distribution of Mn and exposure settings. Third, we developed a novel method that combines network science with MRI relaxometry to characterize the storage and propagation of Mn and Fe in the human brain and the role of different brain regions in the development of neurotoxic effects. Lastly, we explore the application of ultra-short echo (UTE) imaging to map Fe content in the brain and compare it against R2* and quantitative susceptibility mapping (QSM).</p><p><br></p><p dir="ltr">Overall, this dissertation is a successful step towards establishing sensitive neuroimaging screening methods to study the effects of occupational Mn exposure. The individual Mn maps offer great potential for evaluating personal risk assessment for Mn neurotoxicity and allow monitoring of temporal changes in an individual, offering valuable information about the toxicokinetics of Mn. The integration of network science provides a holistic analysis to identify subtle changes in the brain’s mediation mechanisms of excess metal depositions and their associations with health outcomes.</p>

HINTERGRUND/ ZIELSETZUNG: Vom idiopathischen Parkinsonsyndrom (IPS) können so genannte „atypische“ Parkinsonsyndrome (APS) mit einem Anteil von ca. 20% bezogen auf die Gesamtinzidenz unterschieden werden. Neben zusätzlichen Krankheitssymptomen und einem progredienteren Verlauf zeichnen sie sich durch eine schlechtere Prognose aus, die häufig auf einem Nichtansprechen auf eine dopaminerge Therapie beruht. Eine frühzeitige, korrekte Diagnose ist daher sehr entscheidend, aber im Einzelfall auch für Spezialisten äußerst schwierig. Trotz anerkannter klinischer Diagnosekriterien gibt es besonders im Frühstadium eine hohe Rate an Fehldiagnosen. Das zur Zeit vorherrschende Verfahren in der bildgebenden Diagnostik ist die Magnetresonanztomographie, wobei die konventionelle, qualitative MRT bislang keine zufriedenstellenden Ergebnisse bezüglich ihrer Spezifität und Sensitivität gezeigt hat. Die vorliegende Arbeit untersucht in einer direkten Vergleichsstudie das differenzialdiagnostische Potential der sogenannten „erweiterten“ quantitativen MRT-Verfahren. MATERIAL UND METHODEN: Ein Gesamtkollektiv von insgesamt 44 Probanden (IPS/ APS/ gesunde Kontrollen) durchlief ein umfassendes quantitatives MRT- Protokoll (R1/R2(*)-, DTI-, MTR- Mapping) um in manuell bilateral markierten, definierten Regionen (ROIs) in den Basalganglienkernen quantitative Parameter zu erheben. ERGEBNISSE: Die beste hochsignifikante Trennung der MSA-P- Patienten sowohl von IPS- Patienten (p = 0,001) als auch von Kontrollen (p = 0,004) konnte anhand des R2 * - Mappings im Putamen erreicht werden. Es zeigte sich eine Vorhersagekraft AUC von > / = 0,96 mit einer Sensitivität von 77,8 % (bei einer Spezifität von 100 %). Dies bestätigt die große Bedeutung der Eisensensitivität des R2*-Mappings bei der Identifizierung von MSA-P- Patienten. Auch anhand des MTR-Mappings konnte eine MSA-P anhand der putaminalen (p = 0,005) und nigralen (p = 0,003) Signalveränderungen signifikant vorhergesagt werden. Die beste signifikante Abgrenzung der PSP- Patienten von den Kontrollen gelang anhand der DTI- Messungen in der Substantia nigra (p = 0,001) sowie im Globus pallidus (p = 0,004). Für die diagnostische Vorhersage eines IPS konnten keine nutzbaren Signalunterschiede festgestellt werden. Insbesondere in der Substantia nigra zeigten sich gegenüber Kontrollen keine signifikanten Gruppenunterschiede. FAZIT: Unter den angewandten MRT- Verfahren zeigt das R2*-Mapping die beste Vorhersagekraft zur Differenzierung der MSA von IPS- Patienten und das DTI- Mapping zur Identifizierung der PSP- Patienten. Das Besondere unseres Arbeitsansatzes war, im Gegensatz zu vorherigen Studien, die Durchführung der Untersuchung an nur einer Kohorte. Dadurch konnte die Güte der verschiedenen MRT-Verfahren direkt und quantitativ miteinander verglichen werden. Insgesamt unterstreichen die Erkenntnisse dieser Arbeit den Stellenwert und die mögliche klinische Relevanz der quantitativen MRT, insbesondere bei der Identifizierung atypischer Parkinsonsyndrome.

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