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Mickiewicz, Michal. "Effets à court- et long-termes de l’ingestion de régime alimentaires contenant différents taux de protéines par la truie gestante sur le développement du tractus digestif chez la descendance. Effets à court- et long-termes, du retard de croissance intrautérin sur le développement du tractus digestif du jeune." Rennes, Agrocampus Ouest, 2012. http://www.theses.fr/2012NSARB224.
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Le retard de croissance intra-utérin (RCIU) augmente la probabilité de contracter plusieurs maladies métaboliques à l’âge adulte qui peuvent aboutir au syndrome métabolique. Outre les nombreuses études réalisées concernant l’implication de facteurs alimentaires dans l’apparition du syndrome RCIU, celle du tractus gastro-intestinal(GIT) a été peu étudiée et son rôle reste inconnu. L’objectif de ce travail de thèse est d’étudier le développement du GIT (en particulier celui de l’intestin grêle et du pancréas) chez le porc (cet espèce pouvant servir de modèle animal pour l’humain du stade fœtal jusqu’à l’âge de 190j. (stade adulte) chez des animaux normaux ou présentant les caractéristiques du RCIU. Dans ce contexte, cinq expériences furent menées et le développement du GIT fut examiné chez les descendants dont les mères gestantes avaient reçu des aliments dont la teneur en protéines était modifiée (haut et bas niveaux d’une part, et chez des porcelets RCIU nourris avec des formules lactées contenant des niveaux élevés vs n normaux de protéines pendant la période d’allaitement d’autre part. Ces effets ont été étudiés chez le porcelet à court terme (période néonatale et juste avant sevrage) et à long terme (âge de 190j). Enfin l’injection intramusculaire de leptine pour annuler les effets anormaux observés chez le RCIU, fut testée. Les résultats obtenus montrent que l’ingestion de régimes déséquilibrés ingérés par la mère gestante est responsable à l’apparition d’une proportion largement plus importante de descendants RCIU à la naissance. La maturation de l’intestin grêle et du pancréas des animaux RCIU est significativement retardée par un décalage dans la disparition des entérocytes fœtaux, une réduction de la mitose intestinale et un changement dans les activités enzymatiques digestives. Contrairement à ce qui se passe chez les animaux normaux, ceux qui présentent les symptômes RCIU perdent des capacités d’adaptation du développement de leur GIT. Les animaux reçus provenant de mères gestantes ayant ingéré les aliments déséquilibrés ne semblent pas pouvoir déployer une croissance de rattrapage suffisante. Les concentrations plasmatiques du CCK, et surtout celles de GLP-2, seraient impliquées dans le développement retardé du GIT chez le RCIU, les relations qu’il peut y avoir avec les changements au niveau métaboliques et les traitements éventuels possiblesIntrauterine growth retardation (IUGR) constitutes huge problems in adult life due to increased incidence of several metabolic diseases resulting in symptoms which together fold up in metabolic syndrome. Despite important contribution of dietary factors studied in relation with IUGR apparition, the gastrointestinal tract (GIT) stay little implicated and its role is almost unknown. The aim of this PhD dissertation was to study the GIT development (in particular for small intestine and pancreas) in pig species (and also as model of humans) from fetus stage until 190d of age (adult) in normal and IUGR animals. In this context,five experiments were conducted and the GIT development was examined in offspring when their pregnant mothers were fed different dietary protein levels (high an low-unbalanced vs adequate diets) n one hand and in IUGR piglets fed milk formula based on high vs normal protein levels during suckling period in another hand. These effects were investigated in piglets at short term (neonate, before weaning) and at long term (190 d old). Finally, leptin i. M. Injection was examined to reverse the abnormal the effects of IUGR stage. Obtained results showed that maternal unbalanced protein diets ingested during pregnancy led to an important increase of the proportion of neonatal IUGR piglets. The small intestinal mucosa and pancreas tissue maturation in IUGR animals were significantly delayed in disappearance of fetal enterocytes, reduction of mitosis and apoptosis, villi shortening and changes in digestive enzyme activities. In contrast to non-IUGRs, IUGRs lost capability to adapt GIT functions after birth. IUGR piglets coming from mother fed unbalance diets did no manifest catch-up growth. Plasma CCK, and mainly GLP-2, could be implicated in the delay au development in IUGR offspring. More researches are necessary to investigate GIT development in IUGRs, the lingks with metabolic changes, and some possible IUGR treatments
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Didelot, Gérard. "La mémoire à long terme chez la drosophile : un cadre d'étude des retards mentaux non syndromiques." Paris 11, 2006. http://www.theses.fr/2006PA112018.
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Le retard mental est une pathologie qui affecte de 1 à 3% de la population. II se caractérise par un quotient intellectuel inférieur à 70 associé à des déficits comportementaux. De nombreux gènes connus pour leur implication dans ce désordre neurologique sont bien conservés chez la drosophile. La drosophile se présente comme un système modèle très attractif pour mieux comprendre les mécanismes moléculaires et cellulaires impliqués dans l'apprentissage et la mémoire. Malgré la simplicité de son système nerveux, elle est capable d'associer une odeur à un choc électrique et de stocker cette information à long terme. Les homologues de trois gènes impliqués dans le retard mental non syndromique chez l'Homme ont été étudiés chez la drosophile : tequila, DPak et dpix. Grâce à la technique du RNAi, l'expression des gènes d'intérêt a été diminuée au niveau des corps pédoncules, le centre de la mémoire olfactive. Les mouches ont présenté un défaut de mémoire à long terme et une mémoire à court terme normale. De plus, nous avons montré que tequila et DPak sont spécifiquement requis à l'état adulte pour une mise en place correcte de la mémoire à long terme. En revanche, la diminution d'expression de ces gènes n'a aucune conséquence sur la morphologie des corps pédonculés, suggérant un rôle essentiel dans les mécanismes de plasticité synaptique nécessaires à la mise en place de la mémoire. Le gène tequila montre une augmentation d'expression lors de la mise en place de la mémoire à long terme. Ce travail de thèse a permis de montrer que la drosophile peut servir de modèle pour une étude approfondie des mécanismes impliqués dans le retard mental non syndromiqueMental retardation affects 1 to 3% of the population of the industrialized contries. People affected by this pathology have a intellectual quotient less than 70. A lot of genes are known to be implicated in this neurological disorder, they are well conserved in Drosophila genome. Drosophila seems to be a very attractive animal system to better understand the cellular and molecular mechanisms underlying learning and memory. Despite his relatively simple nervous system, drosophila is able to make the association between an odour and a electric shock and to retrieve this information later. Three genes implicated in non syndromic mental retardation were studied in drosophila : tequila, DPak and dpix. With RNAi, these three genes were silenced in the mushroom bodies, the olfactory memory center. Flies have a soecific long term memory defect and a normal short term memory. Tequila and DPak are required specifically in the long term memory establishment. The silencing of these genes does not affect the morphology of the mushroom bodies suggesting a essential role in pathways underlying neuronal plasticity who is required for long term memory. Teq expression is upregulated during the establishment of long term memory. This work has shown that drosophila could be a useful organism to better understand the non syndromic mental retardation
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Mlika, Arbi. "Evaluation à long terme de la politique périnatale : évolution de la prévalence des déficiences sévères dans trois générations." Paris 11, 1994. http://www.theses.fr/1994PA11T018.
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Deng, Yang. "Delay estimation and predictor-based control of time-delay systems with a class of various delays." Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0014.
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Le retard est un phénomène largement présent dans les systèmes de commande(i.e.retard physique, latence de communication, temps de calcul) et peut en dégrader les performances ou même les déstabiliser. Si le retard est faible, la stabilité en boucle fermée peut être garantie par des lois de commande conventionnelles mais ces techniques ne sont plus efficaces si le retard est long. Cette thèse est dédiée à la commande des systèmes à retard avec retards longs inconnus ou avec des retards incertains. Pour compenser les retards longs, la commande prédictive est adoptée et des techniques d’estimation de retard sont développées. Selon les différents types de systèmes et de retards, trois objectifs sont visés dans la thèse. Le premier objectif considère la commande des systèmes linéaires avec retards constants inconnus pour lesquels un nouvel estimateur de retard est proposé pour estimer les retards inconnus. Le retard estimé est ensuite utilisé dans la commande prédictive pour stabiliser le système. Le deuxième objectif se concentre sur la stabilisation pratique des systèmes commandés à distance avec des retards inconnus variants. Dans ce cas, les retards sont estimés de manière pratique : une boucle de communication spécifique est utilisée pour estimer le retard en temps fini puis le système est stabilisé par une commande prédictive. Les tests expérimentaux réalisés sur un réseau WiFi ont montré que l’algorithme permet d’estimer de manière robuste les retards variants. Le dernier objectif est consacré à la commande des systèmes commandés en réseau avec retards variants. La commande prédictive discrète est utilisée pour compenser les retards longs et variants et les ré-ordonnancements de paquets dans le canal capteur-contrôleur sont également considérés. De plus, cette méthode est validée par l’asservissement visuel d’un pendule inverse commandé en réseau. Les performances obtenues sont meilleures que les méthodes de commande non-prédictives classiquesTime-delay is a widely-found phenomenon (i.e. physical dead time, communication latency, computation time) in real control systems, which can degrade the performances of the system or destabilize the system. If the time-delay is small, then the closed-loop stability can be guaranteed with conventional control techniques; but these techniques are no longer effective if the time-delay is long. This thesis is dedicated to the control of time-delaysystemswithunknown or uncertain long time-delays. In order to compensate long time-delays, the predictor-based control technique is adopted, and the delay estimation techniques are developed to assist the predictor-based controller. According to the different types of the systems and the time-delays, three objectives are analyzed in the thesis. The first objective considers the control of LTI systems with unknown constant delays, a new type of delay estimator is proposed to estimate the unknown time-delays, then it is plugged into apredictor-based controller to stabilize the system. The second objective focuses on the practical stabilization of remote control systems with unknown time-varying delays, at this time, the time-delays are estimated by a practical way: a specific communication loop is used to estimate the round-trip delay in finite time, and the system is stabilized with a predictor-based controller. This practical delay estimation algorithm is implemented on a real WiFi network, it can estimate the time-varying delays with good performances and robustness. The last objective is devoted to the control of networked control systems with time-varying delays, the discrete predictor-based control techniques are used to compensate long time-varyingdelays,and the packet reordering in the sensor-to-controller channel is also considered. Moreover, this control solution is validated on a networked visual servo inverted pendulum system, and the control performances are fairly better than the non-predictive control methods
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Domingos, Perbet Laetitia. "Plasticité synaptique corticostriatale à long terme chez de nouveaux modèles murins de Trisomie 21, Ms4Yah et Ts3Yah." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2074/document.
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La Trisomie 21 ou Syndrome de Down, est due à la présence surnuméraire du chromosome 21 humain (Hsa21), le surdosage génétique qui en résulte provoque différents phénotypes. Cette pathologie est la première cause de retard mental. Notre étude vise à savoir si l’aneuploïdie d’un intervalle génétique, encore non étudié, entraîne des modifications dans la mise en place des processus à l’origine des facultés cognitives. Cet intervalle, entre les gènes Cstb et Prmt2 est porté par le chromosome murin 10 (MMU10) au sein d’une portion homologue à la partie télomérique du Hsa21. Pour cela de nouveaux modèles murins ont été créés, Ms4Yah est monosomique et Ts3Yah est trisomique pour cet intervalle. Le but est donc de caractériser les conséquences de l’aneuploïdie sur le fonctionnement des neurones permettant l’encodage des informations, appelé plasticité synaptique à long terme. Nous avons enregistré ce phénomène au niveau de la communication entre le cortex et le striatum, structures impliquées dans les processus mnémoniques, grâce à la technique électrophysiologique de patch clamp en configuration cellule entière. Ces enregistrements sont faits in vitro sur tranches de cerveaux de souris. Les propriétés électrophysiologiques des NETMs ont été caractérisées. La plasticité synaptique corticostriatale à long terme de type glutamatergique a été étudiée avec des protocoles de stimulation spécifiques, appliqués au niveau cortical. Des protocoles de conditionnement à haute et à basse fréquence ont été utilisés. Nous avons observé que l’aneuploïdie portée par les modèles avait une influence sur la mise en place de la plasticité synaptique corticostriatale à long terme qui est différente en fonction du dosage génétique. Ms4Yah met en place une DLT suite au protocole SHF de même que Ts3Yah. Lorsque le protocole SBF est utilisé Ms4Yah met en place une forme de plasticité à court terme contrairement à Ts3Yah qui présente une DLT. L’intervalle étudié ici jouerait donc un rôle dans le phénotype de la Trisomie 21. Certains gènes de l’intervalle semblent être de bons candidats pour expliquer les phénomènes observés, notamment S100b, Pcbp3 et Trmp2Trisomy 21 or Down syndrome is due to a third copy of human chromosome 21 (Hsa21) in the genome, this leads to a global genetic overexpression which results on multiple behavioral phenotypes. This pathology is the first and most common cause of mental retardation. Our study aims to understand whether an aneuploidy of a non-studied genetic interval, included in Hsa21, causes changes in processes mediating intellectual abilities. This interval, between Ctsb and Prmt2, is located on murine chromosome 10 (MMU10) within an homologous portion of the Hsa21 telomeric part. Thus, new mouse models have been engineered, Ms4Yah is monosomic and Ts3Yah trisomic for Cstb-Prmt2 interval. Hence, the aim of this project is to characterized aneuploidy consequences on neuronal functions which lead to information encoding, named long term synaptic plasticity. We have recorded this phenomenon within cortex-striatum neuronal connexion, which is involved in mnemonic processes, using whole-cell patch-clamp electrophysiological technique. Records were made in vitro on mouse horizontal brain slice. We characterized METMs electrophysiological properties. Then, glutamatergic corticostriatal long term synaptic plasticity was studied with specific stimulation protocols applied on the cortex. High and low frequency conditioning protocols were used. We observed that aneuploidy of the models influenced corticostriatal long term synaptic plasticity setting which is different according to the genetic dosage. Ms4Yah showed LTD after HFS protocol like Ts3Yah. But when SBF was applied, Ms4Yah shows a short term plasticity form, conversely Ts3Yah shows anew a LTD. The studied interval may play here a role in phenotype of Trisomy 21. Some of the genes comprised in the Ctsb-Prmt2 interval seemed to be good candidates to explain observed phenotypes, namely S100b, Pcbp3 and Trmp2
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GALLART, MARTINE. "Suivi a long terme d'une serie continue de patientes ayant une endometriose pelvienne traitee par d-trp6-lh-rh retard associe ou non a un geste coeliochirurgical ou chirurgical." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX20024.
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Chan, Chung-yun, and 陳宗恩. "Planning for future retail development in Yuen Long." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31258098.
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Chan, Chung-yun. "Planning for future retail development in Yuen Long /." Hong Kong : University of Hong Kong, 1992. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14804694.
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Rietbergen, Muriel Isolde. "Long-term asset and liability management for minimum guaranteed return funds." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613768.
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Buchanan, Lauren J. "The Success of Long-Short Equity Strategies versus Traditional Equity Strategies & Market Returns." Scholarship @ Claremont, 2011. http://scholarship.claremont.edu/cmc_theses/286.
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This study examines the performance of long-short equity trading strategies from January 1990 to December 2010. This study combines two financial screens that will yield candidates for both long and short positions for each month during the aforementioned time period. Two long-short strategies are tested: (1) perfectly-hedged, or equal allocation to long and short positions, and (2) net-long. The results of this thesis reveal that if a long-short equity manager is able to successfully determine what companies are overvalued and undervalued and actively rebalance their portfolio, perfectly-hedged and net-long strategies can generate superior risk-adjusted alpha.
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Lindgren, Martin, and Tommie Åkesson. "Long-term customer relationship : A study on how to achieve long-term customer relationship in the car retail sector." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Företagsekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-36711.
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In the literature today, there is an apparent absence of generally accepted models for how to achieve customer loyalty within the car retail sector. Researchers have proposed that it is less expensive to serve long-term customers than newly acquired customers (Reishheld, 1994; Mittal & Lassar, 1998; Zineldin, 2006). However, the overall experience of satisfaction will play a crucial role for companies’ ability to build a long-term relationship with its customers (Gee, et al. 2008). Upon this gap, we decided to build a framework where we propose that the delivery within “sales and service” plays a crucial role for the perceived customer satisfactions associated with the retailer. In the study, we first investigated the circumstances within “sales and service” domains that leads to customer satisfaction and secondly, we examined whether fulfilled customer satisfaction in the “sales and service” domain leads to a long-term customer relationship for the car retailers. In accordance with the purpose of gaining knowledge on long-term customer relationship building within the car retail sector, we developed further knowledge that is applicable for car retailers as well as for the industrial wisdom within the automotive industry. In the study, we applied the deductive approach. Hypotheses was generated based on existing literature, and were developed into a proposed framework, see figure 2. We tested these hypotheses by applying a qualitative study to confirm or refute them. The study follows a qualitative research approach, by way of reason that we wanted to gain deep insight into how all the interviewees experience and their treatments within the car retail context; the study was conducted based on qualitative data from semi-structured interviews from ten participants. Our study concludes that there is a general trend within the empirical findings that is mostly confirmed by the existing literature, that can provide a model which leads to perceived customer satisfaction within sales and service for a specific car retailer. The circumstances from “sales and service” that leads to customer satisfaction within the car retail sector are when the retailers: Work hard to achieve a personified relationship at all levels of the customer interaction, focusing on products offering and services according to the customers’ current needs, while delivering in a professional way according to their profession and always staying honest with the customer. The results further reveal that 60 per cent of the interviewees are willing to stay in a long-term customer relationship with the retailer that can best fulfil the expectations set out above. Although recent research shows that customer loyalty is decreasing (Laurell & Parment, 2015), our findings reveal that customers continue to believe in long-term customer relationship with the car retailers. As such, managers should put in places processes and measures that can achieve greater customer satisfaction throughout the “sales and service” period.
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Grison, Sarah. "Long term negative priming and inhibition of return : episodic retrieval of inhibitory states." Thesis, Bangor University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246472.
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Karageozian, Nanor. "Long-term diasporic return migration in post-Soviet Armenia : balancing mobility and sedentarism." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:25ff00d2-816b-4fdd-b8fb-ec5eeb4ceead.
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This thesis examines the immigration to and long-term settlement in post-Soviet Armenia of Armenians from well-established diasporic communities - mostly from Iran, Syria, Lebanon, Iraq, Canada, and the United States. It argues that diverse levels and combinations of anchoring and floating co-exist in the diasporan returnees' return motivations, post-return integration experiences, and identity and belonging (re)conceptualization processes. They are manifested in the returnees' habitual dispositions, imaginative aspirations, and practical considerations, which develop within a particular sociohistorical environment. The study also considers the changes that occur over time in the structural context and in the ways returnees engage with it. It demonstrates that the inclination of returnees toward more rooted or more mobile directions depends, to a large extent, on their diasporic community background, the generation they belong to, and more immediate factors related to their life-cycle stages. Throughout the analysis, the important role of emotions in the return visions and experiences is highlighted. The thesis makes an empirical contribution by studying the largely uncharted case of Armenian diasporic return in the post-Soviet era. At a more theoretical level, it promotes a balanced approach that goes beyond the overemphasis on mobility and the relative neglect of sedentarism that have characterized many works in the fields of diaspora and migration studies over the past few decades. Underlying this balanced path is the goal of recognizing the equal importance of and complex inter-relationship between human agency and objective structures. To this end, the thesis relies on a theoretical framework based primarily on some of Pierre Bourdieu's key conceptual tools, with certain modifications. Thus, the study frames the topic of long-term diasporic return migration within broader social theory. This way, not only does it link diasporic return to paradigms in migration and diaspora studies, but it also views it from a wider angle of social action.
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Shahrokh, Bahram Edward Kaikhosrow. "The Experience of Relapse After Long-term Sobriety and Subsequent Return to Sobriety." Antioch University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1560629709925552.
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Kerbabian, Shant. "A Long Way Home : Spontaneous Returns and Potential Returns of Syrian Refugees Examined." Thesis, Linnéuniversitetet, Institutionen för samhällsstudier (SS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-84663.
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The recent wave of Syrian refugees’ spontaneous return to conflict areas in Syria is not a new phenomenon, various cases of return to areas that do not meet safety and security standards has happened in cases like Somali refugees returning from Kenya or Angolan refugees returning from Zambia and the Democratic Republic of Congo. However, the Syrian case is important to study in order to examine any new patterns or elements in refugee returns that could arise or could be unpacked. This study examines Syrian refugees’ spontaneous returns, to what is considered by the international community as unsafe Syria and discusses the reasons for return that were provided by refugees returning currently and refugees who answer the question of return. The study finds that the notion of “home” and “homeland” are amongst the most influential when it comes to the decision to return coupled with push factors like livelihood issues and discrimination in host countries, in addition to pull factors from country of origin like amnesty regarding military conscription. The study finds that refugees not returning do so due to starting a new life, not having guarantees of safety and having lost everything in their home country. The study confirms King’s (2000) argument regarding home country pull factors having a bigger influence in impacting refugee returns. This study uses discourse analysis as a method using the proposed framework of Teun A. van Dijk’s (1985, 2011), the primary data source are interviews by Syrian refugees on YouTube in the Arabic Language. YouTube was chosen due to the role it played throughout the Syrian uprising in providing news to Syrians. The analysis of the data will use a four-dimensional framework which dissects push and pull factors, then examines them through the transnational and diaspora theories for refugee returns and has the place-identity theory as an overall starting point. The study concludes by recommending the international community pays more attention to the psychological factors from the home country so interventions and programmes of return make sure refugees are safe, protected and not falsely lured into return.
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Gerner, Ulla. "De sjukskrivna i rehabiliteringsprocessen : hinder och möjligheter." Doctoral thesis, Stockholm University, Department of Social Work, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-521.
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The background to the thesis is the high rate for sickness absence in Sweden since the end of the 1990s. In an international perspective, the Swedish sickness absence appears exceptionally high. This can appear paradoxical bearing in mind the high standard of living and the high average length of life in Sweden, and there is much to indicate that complex causal correlations are involved.
The overall aim of the thesis is to study and analyse the return to work or transition to disability pension, for persons on long-term sick leave from their own perspective. The focus of the thesis is the individual in a social context.
The theoretical frame of reference is within medical sociology and is about sickness concepts and models and on medicalisation. The concept of work capacity is also taken up based on the concepts of disability and impairment.
The empirical material consists of four studies. Two of these are qualitative interview studies with women. One of them (I) is about Greek women who have been granted Swedish disability pension. The aim of this study is to find explanations why such a large number of Greek women have become disability pensioners in Sweden. The analysis indicated some important factors: the doctors, the family and the social insurance system. The women had unclear psychosomatic complaints, which had been medicalised. The other qualitative study (IV) concerned women who after sick leave and rehabilitation succeeded in returning to work. It was seen to be strong and stubborn women who had to struggle to get back to working life. They had also been well taken care of in rehabilitation.
The other two studies (II and III) are quantitative, prospective cohort studies with persons on sick leave with unspecified back and neck complaints. One main aim of one study (III) was to investigate the importance of motivation for rehabilitation and return to work. Two specially designed forms were used. It was seen, among other things that the forecasts of the person on sick leave on return to work coincided quite well with a follow-up two years later. One important result was that those who had undergone rehabilitation measures had returned to work to a much lesser extent than those who had not.
Overall, the results showed the importance of listening to the individual and taking their own assessments of obstacles and possibilities in the rehabilitation process into consideration. The results in study III indicated that rehabilitation had not been sufficiently effective and in many cases did not lead to a return to work.
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Ahlstrom, Linda. "Improving Work Ability and Return to Work among Women on Long-term Sick Leave." Doctoral thesis, Högskolan i Borås, Institutionen för Vårdvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-3703.
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The overall aim of this thesis was to gain new knowledge of factors and interventions that improve work ability and return to work (RTW) among women on long-term sick leave from human service organizations (HSOs). The specific aims of the studies were: to evaluate the associations between the self-rated Work Ability Index (WAI) and Work Ability Score (WAS), and the relationship with prospective sick leave, symptoms, and health (Paper I); to investigate whether intervention with myofeedback training or intensive muscular strength training could decrease pain and increase work ability among women with neck pain (Paper II); to examine the associations between workplace rehabilitation and the combination of supportive conditions at work with work ability and RTW over time (Paper III); and to explore experiences, views, and strategies in the rehabilitation process for RTW (Paper IV). This thesis is based on a prospective cohort study (n=324) and a randomized controlled study (RCT) (n=60, participants with neck pain). Both quantitative and qualitative methods were used. The data collection consisted of questionnaires, laboratory-observed data, register-based data, and interviews. The results showed a very strong association between WAI and WAS, and results predicted future sick leave degree, health-related quality of life, vitality, neck pain, self-rated general health, self-rated mental health, behavioral stress, and current stress (Paper I). In the RCT (Paper II), individuals in the myofeedback intervention group increased their vitality and work ability over time and individuals in the intensive musculoskeletal strength training group increased their WAI, WAS, and mental health over time. WAI, WAS, and RTW increased over time among individuals provided with workplace rehabilitation and supportive conditions at work (Paper III) such as a sense of feeling welcome back at work, influence at work, possibilities for development, degree of freedom at work, meaning of work, quality of leadership, social support, sense of community, and work satisfaction. Women described (Paper IV) how they were striving to work and how they had different views, strategies, and approaches in the rehabilitation process for RTW. They expressed a desire to work, their goals for work, and their wishes for work. In the rehabilitation process for RTW they described their interaction with stakeholders as either controlling the interaction or struggling in the interaction. They described strategies to cope with RTW in terms of yo-yo (fluctuating) working: yo-yo working as a strategy or yo-yo working as a consequence. This thesis identifies factors of importance in improving work ability and RTW among women on long-term sick leave from HSOs. For women with neck pain, the intervention study showed feasibility of the intervention and demonstrated improved work ability and decreased pain (Paper II). The intensive muscular strength training program, which is easy for the individual to learn and perform at home, was associated with increased work ability. The results regarding rehabilitation highlight the importance of integrating workplace rehabilitation with supportive conditions at work to increase work ability and improve RTW (Paper III). Women expressed that they were striving to work and that they wanted to work (Paper IV). These women were “going in and out” of work participation (yo-yo working) as a way to handle the rehabilitation process. For assessing the status and progress of work ability among women on long-term sick leave, the single-question WAS may be used as a compliment to the full WAI as a simple indicator (Paper I).Akademisk avhandling som för avläggande av medicine doktorsexamen vid Sahlgrenska akademin, Göteborgs universitet, kommer att offentligen försvaras i hörsal Hamberger, Medicinaregatan 16 A, Göteborg, måndagen den 6 oktober 2014, klockan 09.00
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Ho, Kwok-wai, and 何國煒. "The end of a heritage : documentation of Shing Fat, the last traditional rice shop in Yuen Long." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208082.
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In Hong Kong, the popularity of supermarkets and a globalized lifestyle have led to the declined of the traditional rice trade and rice shops. This issue is illustrated by the case of Shing Fat Rice Shop (thereafter referred to as ‟Shing Fat’’), the last tradition rice shop in Yuen Long, a highly urbanized district in the New Territories that was Hong Kong’s centre of rice production from the 19th century to the mid-20th century. Facing stiff competition from modern supermarkets, Shing Fat closed in December 2013.
The significance of this research is that it is the last chance to document the last traditional rice shop business in Yuen Long. While the rice shop is no longer in business, the people involved – the operator, his family and its former customers – can still be reached for their stories. If this research is not carried out soon, the first-hand knowledge of a traditional rice shop business will be lost as memories of people connected with Shing Fat fade away in time.
The focus of the research is to document the tangible and intangible aspects of a vanishing trade, using Shing Fat as a case study. By mapping the shop’s (1) operational history, (2) interior layout and its relationship to the daily business operation, and (3) relationship with the community through its customers, the tangible and intangible aspects of a traditional rice shop in Hong Kong can be documented and analyze in order to give a better understanding to this vanishing traditional retailing trade.published_or_final_version
Conservation
Master
Master of Science in Conservation
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Mauad, Rogério Paulucci. "Análise temporal do retorno de ações de empresas previamente investidas por fundos de private equity no Brasil após 2004." Universidade Presbiteriana Mackenzie, 2014. http://tede.mackenzie.br/jspui/handle/tede/622.
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Previous issue date: 2014-02-04The investments made by private equity funds have grown exponentially over the last ten years. Traditionally, private equity funds are value generators inside of investees due to capital contributions and techniques of differentiated management. In Brazil , several funds, domestic and foreign capital , have made significant investments in companies from various sectors , thus enabling them to grow , develop and made their public offerings , thus becoming , publicly traded companies . Since 2004, with the beginning of a new wave of IPOs ( Initial Public Offering) in the domestic market , dozens of companies previously invested by private equity funds went public on the Stock Exchange of São Paulo . This study analyzed from a sample of 141 IPOs after 2004 if the stock performance of these companies, determined by the methodology Wealth Relative Buy-and -Hold was greater than the return of the shares of companies that have not invested by private equity funds. Statistical and econometric tests were conducted , the results suggests that the market recognizes the value of fund management in investee companies , but the return on stocks has not remained constant over the long term and established in different periods , leading to the conclusion that even companies previously invested by private equity funds are subject to cycles of expansion and contraction of the market and the performance differences between the stocks of companies previously invested by private equity funds and other diminish over the years after the public offering .
Os investimentos realizados por fundos de Private Equity cresceram exponencialmente nos últimos anos. Tradicionalmente, os fundos de Private Equity são geradores de valor dentro das empresas investidas, devido aos aportes de capital e às técnicas de gestão diferenciadas. No Brasil, diversos fundos, de capital nacional e estrangeiro, realizaram investimentos significativos em empresas dos mais diversos setores, possibilitando assim que crescessem, se desenvolvessem e realizassem suas ofertas públicas de ações, tornando-se então, empresas de capital aberto. Desde 2004, com o início de uma nova onda de IPOs (Initial Public Offering) no mercado nacional, dezenas de empresas previamente investidas por fundos de Private Equity abriram capital na Bolsa de Valores de São Paulo. Este trabalho analisou, a partir de uma amostra de 141 IPOs realizados após 2004, se o desempenho das ações destas empresas, apurado pela metodologia Wealth Relative Buy-and-Hold foi superior ao das ações de empresas que não foram investidas por fundos de Private Equity. Foram realizados testes estatísticos e econométricos, cujos resultados sugerem que o mercado reconhece o valor da gestão dos fundos nas empresas investidas, porém o retorno das ações não se manteve constante no longo prazo e nos diferentes períodos apurados, levando à conclusão de que mesmo as empresas previamente investidas por fundos de Private Equity estão sujeitas aos ciclos de expansão e retração de mercado e as diferenças de performances entre as ações das empresas previamente investidas por fundos de Private Equity e as demais diminuem ao longo dos anos após a oferta pública.
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Tsiu, Matsepe Modikeng Theodore. "Testing the Long-Term Profitability of the Short-Term Reversal Strategy." Master's thesis, Faculty of Commerce, 2019. https://hdl.handle.net/11427/32074.
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The purpose of this investigation was to test the theoretical possibility of an investor earning a positive cash return from the activities of the stock market despite effectively holding no position at all in said market. The sample data were the daily returns for the shares of the 780 companies listed on the NASDAQ and the New York Stock Exchange (“NYSE”), which fell within the top 500 listed companies by market capitalisation between 1 January 2005 and 31 December 2017. The reversal strategy’s performance was evaluated using portfolios constructed as quantiles of 100 or 500 shares, respectively, where the investor had the option of implementing the reversal strategy immediately after an information-gathering period closed or a day thereafter. The time intervals used were 1 January 2005 to 29 September 2008 (the day the Dow Jones Industrial Average crashed by 777.68 points), 29 September 2008 to 31 December 2017 and 1 January 2005 to 31 December 2017. Of the 1000 portfolios tested in each time interval, at least 416 had positive average returns in every time interval. Of the portfolios that had positive average returns over the time intervals, at least 66 had statistically significant average returns in every time interval. The best-performing portfolio for the entire sample period was a combination of the best-performing pre-crash and post-crash portfolios - an investor who held that portfolio realised a cumulative return of approximately $61.39 for every $1 invested. The conclusion was that it was theoretically possible for an investor to earn a positive cash return from the market’s activities despite effectively holding no position at all in the market. Consequently, it was concluded that the strong form of Fama’s (1970) Efficient Market Hypothesis was disproved. Future research should include out-of-sample tests, tests that include restrictions on short selling and tests that consider the impact of trading costs on portfolio performance, to render the conclusions of this investigation more practically applicable to investors.
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Lourençon, Adriana de Fatima. "Modelos de análise de sobrevivência aplicados ao estudo do comportamento de retorno do doador de sangue." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/17/17139/tde-27022008-144047/.
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Notícias de escassez no mundo inteiro, dada a crescente demanda e o rigor na triagem clínica, levaram a necessidade de investigar métodos que mensurem o comportamento de retorno do doador de sangue, sobretudo o indivíduo que manifesta a intenção voluntária em doar. Curvas de Sobrevivência entre outros métodos estatísticos são amplamente estudados na literatura com o intuito de obter uma estimativa da chance de um doador vir a realizar uma subseqüente doação, associado ao seu perfil. O objetivo do presente estudo é identificar modelos estatísticos capazes de descrever esse comportamento utilizan do os registros do Centro Regional de Hemoterapia de Ribeirão Preto. A cons trução de modelos de longa-duração, por exemplo, pode ser um meio de evidenciar possíveis subgrupos mais propensos a retornar, além de estimar a proporção de doadores que jamais retornarão. Entre os resultados, obser vamos que apenas 40% dos doadores voluntários retornaram após um ano decorrido da primeira doação, e 20% destes jamais retornarão. O ajuste do modelo longaduração possibilitou ainda indicar alguns subgrupos de doadores prováveis e improváveis de retornar, porém tais resultados reforçam as evidências de que a motivação intrínseca é o que leva o individuo a retornar.Reports of worldwide shortages due the increased demand and rigor of clinical screening have led to the necessity to investigate methods that measure blood donor return behavior, mainly regarding individuals who manifest the voluntary intention to donate. Survival curves, among others statistical methods, have been extensively studied in the literature in order to estimate the likelihood of a donor to make another donation, associated with his profile. The aim of the present study was to identify statistical models describing this behavior using information from the Regional Hemotherapy Center of Ribeirão Preto. The construction of long-term survival model can be a useful instrument for determining the groups more likely to donate, as well as the proportion of donors who will never return. The results obtained revealed that only 40% of the volunteer primary donors return for a new donation one year after the first, with the estimate that 20% will never return. The construction of long-term survival model still facilitated to indicate some groups likely and unlike ly donors to donate, even so such re sults reinforce the evidences that the intrinsic motivation is what prompts a donor to return.
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Lee, Jenny. "The market hall revisited : Cultures of consumption in urban food retail during the long twentieth century." Doctoral thesis, Linköping : Linköping University, Department of Culture Studies (Tema Q), Department for Studies of Social Change and Culture (ISAK), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51953.
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Kinsella, Cheyenne. "Strategies that Influence Retention Rate in Ohio Nursing Home State Tested Nurse Aides." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1590929444739033.
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Johansson, Ulla. "Long-term outcome after brain injury with a focus on return to work, life satisfaction and participation." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-375.
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Dangol, Sharad. "Dynamic Response of Free-Standing Dry Storage Casks and Its Variation under Long Return Period Seismic Events." Thesis, The University of Utah, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10608698.
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Dry storage casks (DSCs) store spent nuclear fuel (SNF) at sites contiguous to nuclear power plants (NPPs), known as Interim Spent Fuel Storage Installations (ISFSIs). DSCs can be stored in concrete bunkers, or designed as free-standing or anchored structures. The primary focus of this study is to investigate response of free-standing DSCs under seismic excitation. Recent consideration of DSCs as a potential midterm solution may increase the operating period (initially 20 years) up to 300 years and requires response reevaluation. A longer compliance period results in larger accelerations, and larger vertical-to-horizontal spectral acceleration ratios that could have destabilizing effects on the cask response.
The response of free-standing DSCs under seismic excitations is highly nonlinear, especially under concurrent sliding and rocking motion triggered by multidirectional seismic excitations. It depends on parameters such as aspect ratio, coefficient of friction between cask and foundation pad, and ground motion characteristics, among other factors.
This research presents the investigation on the response of free-standing DSCs under long return period seismic events. Dynamic experimental tests were performed on a 6-degree-of-freedom shake table at the University of Nevada, Reno. Ground motions used for the tests were spectrally matched to spectral acceleration for seismic events of 10,000- and 30,000-year return periods. Experimental results were used to validate finite element (FE) models. The validated models were then be used to study casks’ response under full intensity long-term seismic event, tip-over spectrum under sinusoidal excitation and soil structure interaction (SSI).
The research also addresses whether the response of DSCs is repeatable under identical ground motions. If the cask response has a relatively large variation (nonrepeatable), the analytical and FE models cannot directly capture this variation. Experimental tests on repeated ground motions showed that the dynamic response is not repeatable, which is the first indicator of chaos or extreme sensitivity to initial conditions. Numerical techniques for chaotic analysis were then implemented, for harmonic excitation, to show that DSCs’ motion is in fact chaotic for certain excitation conditions. This sensitivity was studied in FE models and analytical simulations by varying input parameters by ±1%. This small change resulted in large variation in the response.
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Mahura, Kagisho. "Dividends as a contributor to the total returns of South African equities over the long-term." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/70661.
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Thesis (MBA)--Stellenbosch University, 2007.ENGLISH ABSTRACT: When considering the expected returns from an investment, investors often focus on the appreciation of the share price (capital appreciation) and ignore the contribution of dividends paid, thus overlooking a potentially significant contributor to returns. The objectives of this study are to determine the respective contributions of dividends and capital appreciation to the total returns of South African equities over a 10-year period, beginning 31 July 1996 and ending 31 July 2006, by using the Top 40 index of shares listed on the Johannesburg Securities Exchange over that period. The study also aims to determine whether dividend policy should be considered as carefully as the share's potential capital appreciation by investors when constructing portfolios. The study determined that dividends paid contributed more than 50% of the total return for 10% of the shares in the sample tested. In total, dividends contributed more than 25% of the total return for 33% of the shares. The study also concludes that a share's dividend policy should be considered carefully, as dividends paid may be a significant contributor to a share's expected return.
AFRIKAANSE OPSOMMING: Wanneer die verwagte opbrengste van 'n belegging in ag geneem word, Ie beleggers dikwels klem op die waardestyging van die aandeleprys (kapitaalappresiasie) en ignoreer die bydrae van dividende wat betaal word. Hulle sien nie dividende as 'n potensieel belangrike bydraer tot opbrengste raak nie. Die doelwitte van hierdie studie is om die onderskeie bydraes van dividende en kapitaalappresiasie tot die totale opbrengs van Suid-Afrikaase aandele oor 'n tydperk van 10 jaar - vanaf 31 Julie 1996 tot 31 Julie 2006 - te bepaal deur die Top 40 indeks van aandele te gebruik wat in daardie tydperk op die Johannesburgse Aandelebeurs genoteer was. Die ondersoek wil ook bepaal of beleggers net so versigting na dividendbeleid as na aandele se potensiele kapitaalappresiasie behoort te kyk wanneer portefeuljes saamgestel word. Die studie het bepaal dat dividende wat betaal is, meer as 50% van die totale opbrengste vir 10% van die aandele in die toetsvoorbeeld uitgemaak het. Dividende het altesaam meer as 25% van die totale opbrengs vir 33% van die aandele uitgemaak. Die studie het ook tot die gevolgtrekking gekom dat 'n aandeel se dividendbeleid baie versigtig oorweeg moet word omdat dividende wat betaal word 'n belangrike bydraer tot 'n aandeel se verwagte opbrengs kan wees.
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Nguyen, Trang H. "Long-term Outcomes of Lumbar Fusion Among Workers’ Compensation Subjects: An Historical Cohort Study." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1267735976.
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Rust, Henning. "Detection of long-range dependence : applications in climatology and hydrology." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2007/1334/.
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It is desirable to reduce the potential threats that result from the
variability of nature, such as droughts or heat waves that lead to
food shortage, or the other extreme, floods that lead to severe
damage. To prevent such catastrophic events, it is necessary to
understand, and to be capable of characterising, nature's variability.
Typically one aims to describe the underlying dynamics of geophysical
records with differential equations. There are, however, situations
where this does not support the objectives, or is not feasible, e.g.,
when little is known about the system, or it is too complex for the
model parameters to be identified. In such situations it is beneficial
to regard certain influences as random, and describe them with
stochastic processes. In this thesis I focus on such a description
with linear stochastic processes of the FARIMA type and concentrate on
the detection of long-range dependence. Long-range dependent processes
show an algebraic (i.e. slow) decay of the autocorrelation
function. Detection of the latter is important with respect to,
e.g. trend tests and uncertainty analysis.
Aiming to provide a reliable and powerful strategy for the detection
of long-range dependence, I suggest a way of addressing the problem
which is somewhat different from standard approaches. Commonly used
methods are based either on investigating the asymptotic behaviour
(e.g., log-periodogram regression), or on finding a suitable
potentially long-range dependent model (e.g., FARIMA[p,d,q]) and test
the fractional difference parameter d for compatibility with
zero. Here, I suggest to rephrase the problem as a model selection
task, i.e.comparing the most suitable long-range dependent and the
most suitable short-range dependent model. Approaching the task this
way requires a) a suitable class of long-range and short-range
dependent models along with suitable means for parameter estimation
and b) a reliable model selection strategy, capable of discriminating
also non-nested models. With the flexible FARIMA model class together
with the Whittle estimator the first requirement is
fulfilled. Standard model selection strategies, e.g., the
likelihood-ratio test, is for a comparison of non-nested models
frequently not powerful enough. Thus, I suggest to extend this
strategy with a simulation based model selection approach suitable for
such a direct comparison. The approach follows the procedure of
a statistical test, with the likelihood-ratio as the test
statistic. Its distribution is obtained via simulations using the two
models under consideration. For two simple models and different
parameter values, I investigate the reliability of p-value and power
estimates obtained from the simulated distributions. The result turned
out to be dependent on the model parameters. However, in many cases
the estimates allow an adequate model selection to be established.
An important feature of this approach is that it immediately reveals
the ability or inability to discriminate between the two models under
consideration.
Two applications, a trend detection problem in temperature records and
an uncertainty analysis for flood return level estimation, accentuate the
importance of having reliable methods at hand for the detection of
long-range dependence. In the case of trend detection, falsely
concluding long-range dependence implies an underestimation of a trend
and possibly leads to a delay of measures needed to take in order to
counteract the trend. Ignoring long-range dependence, although
present, leads to an underestimation of confidence intervals and thus
to an unjustified belief in safety, as it is the case for the
return level uncertainty analysis. A reliable detection of long-range
dependence is thus highly relevant in practical applications.
Examples related to extreme value analysis are not limited to
hydrological applications. The increased uncertainty of return level
estimates is a potentially problem for all records from autocorrelated
processes, an interesting examples in this respect is the assessment
of the maximum strength of wind gusts, which is important for
designing wind turbines. The detection of long-range dependence is
also a relevant problem in the exploration of financial market
volatility. With rephrasing the detection problem as a model
selection task and suggesting refined methods for model comparison,
this thesis contributes to the discussion on and development of
methods for the detection of long-range dependence.Die potentiellen Gefahren und Auswirkungen der natürlicher Klimavariabilitäten zu reduzieren ist ein wünschenswertes Ziel. Solche Gefahren sind etwa Dürren und Hitzewellen, die zu Wasserknappheit führen oder, das andere Extrem, Überflutungen, die einen erheblichen Schaden an der Infrastruktur nach sich ziehen können. Um solche katastrophalen Ereignisse zu vermeiden, ist es notwendig die Dynamik der Natur zu verstehen und beschreiben zu können. Typischerweise wird versucht die Dynamik geophysikalischer Datenreihen mit Differentialgleichungssystemen zu beschreiben. Es gibt allerdings Situationen in denen dieses Vorgehen nicht zielführend oder technisch nicht möglich ist. Dieses sind Situationen in denen wenig Wissen über das System vorliegt oder es zu komplex ist um die Modellparameter zu identifizieren. Hier ist es sinnvoll einige Einflüsse als zufällig zu betrachten und mit Hilfe stochastischer Prozesse zu modellieren. In dieser Arbeit wird eine solche Beschreibung mit linearen stochastischen Prozessen der FARIMA-Klasse angestrebt. Besonderer Fokus liegt auf der Detektion von langreichweitigen Korrelationen. Langreichweitig korrelierte Prozesse sind solche mit einer algebraisch, d.h. langsam, abfallenden Autokorrelationsfunktion. Eine verläßliche Erkennung dieser Prozesse ist relevant für Trenddetektion und Unsicherheitsanalysen. Um eine verläßliche Strategie für die Detektion langreichweitig korrelierter Prozesse zur Verfügung zu stellen, wird in der Arbeit ein anderer als der Standardweg vorgeschlagen. Gewöhnlich werden Methoden eingesetzt, die das asymptotische Verhalten untersuchen, z.B. Regression im Periodogramm. Oder aber es wird versucht ein passendes potentiell langreichweitig korreliertes Modell zu finden, z.B. aus der FARIMA Klasse, und den geschätzten fraktionalen Differenzierungsparameter d auf Verträglichkeit mit dem trivialen Wert Null zu testen. In der Arbeit wird vorgeschlagen das Problem der Detektion langreichweitiger Korrelationen als Modellselektionsproblem umzuformulieren, d.h. das beste kurzreichweitig und das beste langreichweitig korrelierte Modell zu vergleichen. Diese Herangehensweise erfordert a) eine geeignete Klasse von lang- und kurzreichweitig korrelierten Prozessen und b) eine verläßliche Modellselektionsstrategie, auch für nichtgenestete Modelle. Mit der flexiblen FARIMA-Klasse und dem Whittleschen Ansatz zur Parameterschätzung ist die erste Voraussetzung erfüllt. Hingegen sind standard Ansätze zur Modellselektion, wie z.B. der Likelihood-Ratio-Test, für nichtgenestete Modelle oft nicht trennscharf genug. Es wird daher vorgeschlagen diese Strategie mit einem simulationsbasierten Ansatz zu ergänzen, der insbesondere für die direkte Diskriminierung nichtgenesteter Modelle geeignet ist. Der Ansatz folgt einem statistischen Test mit dem Quotienten der Likelihood als Teststatistik. Ihre Verteilung wird über Simulationen mit den beiden zu unterscheidenden Modellen ermittelt. Für zwei einfache Modelle und verschiedene Parameterwerte wird die Verläßlichkeit der Schätzungen für p-Wert und Power untersucht. Das Ergebnis hängt von den Modellparametern ab. Es konnte jedoch in vielen Fällen eine adäquate Modellselektion etabliert werden. Ein wichtige Eigenschaft dieser Strategie ist, dass unmittelbar offengelegt wird, wie gut sich die betrachteten Modelle unterscheiden lassen. Zwei Anwendungen, die Trenddetektion in Temperaturzeitreihen und die Unsicherheitsanalyse für Bemessungshochwasser, betonen den Bedarf an verläßlichen Methoden für die Detektion langreichweitiger Korrelationen. Im Falle der Trenddetektion führt ein fälschlicherweise gezogener Schluß auf langreichweitige Korrelationen zu einer Unterschätzung eines Trends, was wiederum zu einer möglicherweise verzögerten Einleitung von Maßnahmen führt, die diesem entgegenwirken sollen. Im Fall von Abflußzeitreihen führt die Nichtbeachtung von vorliegenden langreichweitigen Korrelationen zu einer Unterschätzung der Unsicherheit von Bemessungsgrößen. Eine verläßliche Detektion von langreichweitig Korrelierten Prozesse ist somit von hoher Bedeutung in der praktischen Zeitreihenanalyse. Beispiele mit Bezug zu extremem Ereignissen beschränken sich nicht nur auf die Hochwasseranalyse. Eine erhöhte Unsicherheit in der Bestimmung von extremen Ereignissen ist ein potentielles Problem von allen autokorrelierten Prozessen. Ein weiteres interessantes Beispiel ist hier die Abschätzung von maximalen Windstärken in Böen, welche bei der Konstruktion von Windrädern eine Rolle spielt. Mit der Umformulierung des Detektionsproblems als Modellselektionsfrage und mit der Bereitstellung geeigneter Modellselektionsstrategie trägt diese Arbeit zur Diskussion und Entwicklung von Methoden im Bereich der Detektion von langreichweitigen Korrelationen bei.
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Snyders, Tony. "Growing through acquisitions : the long-term effects of total shareholder return of companies listed on the Johannesburg Stock Exchange." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/64817.
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Mergers and acquisitions (M&A) are critical components for companies searching to expand or improve organisational performance. This study examined whether companies listed on the Johannesburg Stock Exchange growing through acquisitions delivered superior total shareholder returns (TSR) compared to organic or mixed growth strategies from 2007 to 2016.
The extensive existing share-price based literature indicate that M&A events are mostly value-destroying in the long-term, while comparative growth strategy studies are mostly ambiguous. The bulk of existing M&A literature is based on developed countries, while no equivalent growth strategy studies were found in South Africa.
This research will aim to provide insight to companies looking to either expand locally or enter the South African market as to which growth strategy to employ.
This study is quantitative of nature that considered secondary data in the form of historical share price, dividend and M&A data of companies listed on the JSE derived from the Thomson Reuters Eikon and McGregor BFA databases. Judgmental sampling was employed to identify a final sample of 104 companies that met the relevant criteria and was further divided into 43 organic, 30 mixed and 31 acquisitive growth companies. Statistical techniques in the form of independent samples t-tests and simple linear regression was implemented to test for differences and prediction.
The research concluded that companies growing through acquisitions do not contribute significant different TSR compared to organic or mixed growth companies. In addition, it was highlighted that dividend yields are a significant predictor of TSR in specific instances.Mini Dissertation (MBA)--University of Pretoria, 2017.
lt2018
Gordon Institute of Business Science (GIBS)
MBA
Unrestricted
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Kowalik, Aleksandra. "Jerónimo Martins SGPS: Portugal retail: under the Polish umbrella… Escaping from the Portuguese problems and securing long term growth." Master's thesis, NSBE - UNL, 2012. http://hdl.handle.net/10362/9884.
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Van, Der Hoven Anné. "Architecture of the interface: engaging architecture in a long neglected public space : the street." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/78600.
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The project set out to develop a non-typological approach to public space in a poly-centric city. The principle of third space was used to conceptualise an interface for public life that would potentiate both public and private realms, and mitigate the issues currently related to contemporary public space.
The notion of third space was also considered for the projects programmatic response in order to achieve an authentic urban experience. In essence a bridge between industrial typology and retail space was proposed to remedy the state of the unconscious consumer as well as establish the cross-fertilisation that occurs when a larger demographic of users are present.Mini Dissertation (MArch (Prof))--University of Pretoria, 2020.
Architecture
MArch (Prof)
Unrestricted
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Le, Bris David. "Les actions françaises depuis 1854 : analyses et découvertes." Thesis, Orléans, 2011. http://www.theses.fr/2011ORLE0502/document.
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Le Bris a collecté environ 200 000 données sur les actions françaises entre 1854 et 1988 pour construire un indice de performances.Différents biais qui surestimaient la rentabilité dans les indices français existants sont identifiés. D’autres probables cas à l’étranger sont présentés.Sur le long terme, les actions offrent une meilleure rentabilité que les autres actifs mais sans prime particulière.Par rapport aux actions américaines, les françaises sous-performent y compris durant les périodes de paix.Le marché est très sensible aux changements de gouvernements et surperforme sous ceux de gauche.Une nouvelle méthode de détection des krachs est proposée. Elle identifie des krachs cohérents avec l’histoire.Les entreprises de services dominent la capitalisation boursière de manière quasi-continue depuis 1854.La rationalité des investissements en emprunts russes avant 1914 est démontrée grâce à une optimisation de portefeuille parmi les actifs français (action, obligation, rente) et huit emprunts d’Etats étrangers.Une nouvelle méthode de décomposition du bénéfice de diversification est proposée ; les investisseurs français étaient attirés par la faible corrélation plus que par les rentabilités étrangères supérieures avant 1914.Les actions françaises et américaines présentent une hausse de corrélation sur le long terme probablement suivant l’intégration des économies. Ainsi, l’incitation à diversifier internationalement a baissé.Le risque de marché enregistre une forte hausse durant l’entre-deux-guerres et le niveau pré-1914 n’est jamais retrouvé. Il semble lié à la fin du Gold Standard, à l’inflation et aux déficits publics.Conséquence de la hausse de ce risque commun, la corrélation entre actions françaises augmente, réduisant l’effet de diversification domestique ; a l’opposé un « super effet portefeuille » est identifiée avant 1914Le Bris, collecting about 200,000 data on French stocks from 1854 to 1988, builds a performance index. Several biases leading to overestimate the returns in prior French indices are demonstrated, as well as other probable examples across the globe.Over the long run, French stocks provide a better return than other assets, but without any excessive premium.Compared to US stocks, French stocks have underperformed since 1914, including during the periods of peace.The French stock market is highly sensitive to governmental changes, and overperforms under the left ones.A new method to identify market crashes is proposed. This method identifies crashes that are consistent withhistory.Firms from service industries have almost always dominated market capitalization since 1854.The rationality of the French investments in Russian bonds, before 1914, is demonstrated thanks to a portfoliooptimization among French assets (stock, bonds and corporate bonds) and eight international state bonds.A new method to decompose the benefit of diversification is proposed; before 1914, French investors wereclearly attracted by low foreign correlation rather than higher foreign returns.French and US stocks present a long-term rise in correlation, probably following the economic integration.Thus, the incentive to diversify through international markets has decreased.The market risk exhibits a significant rise during the interwar-period, and the pre-1914 level is never reachedagain. This risk appears to be linked to the end of the Gold Standard, the inflation rate and the public deficits.The consequence of the rise of this common risk is that the correlation among French stocks trend upwards, andthen, reduce the domestic portfolio effect; reversely, before 1914, a “super portfolio effect” is identified
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Brito, Sergio da Costa. "O retorno aos bastidores : envelhecer no retiro do artista riograndese." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/10479.
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Este trabalho busca analisar os caminhos do envelhecimento dos artistas idosos residentes no Retiro do Artista Rio-Grandense de Porto Alegre, tentando compreender as tensões entre suas memórias de trabalho na arte e suas circunstâncias atuais de vida. O referencial teórico-metodológico utilizado é a Analise de Discurso da escola francesa no enfoque proposto por Dominique Maingueneau. Os fragmentos de texto utilizados para esta análise provém de entrevistas com três artistas idosos moradores desta instituição, com idades entre os 62 e os 76 anos. Partiu-se de quatro eixos temáticos para organizar a descrição/interpretação do discurso produzido pelo perfil composto pelos sujeitos de pesquisa: o ser idoso e o processo de envelhecimento, o afastamento do trabalho artístico profissional, o viver na instituição e o olhar sobre o passado, o presente e a espera do futuro. Os efeitos de sentido detectados, descritos e interpretados a partir do corpus de pesquisa, formados pelos fragmentos de discurso destacados, mostraram que a proposta institucional do Retiro, apesar de responder a uma necessidade social de abrigar artistas idosos carentes, não chega a preencher sua proposta de oferecer aos usuários um espaço de reencontro consigo mesmos após uma vida pessoal e de trabalho atribulada, que redundou numa velhice desassistida e sem meios. Isto se deve às dificuldades emocionais dos próprios moradores, expostos a diversos fatores de estresse que levam a conflitos intrainstitucionais no domínio do vincular.Os idosos pesquisados dão sentido à sua experiência vivida no trabalho utilizando suas habilidades, então desenvolvidas, como estratégias de enfrentamento dos referidos fatores. A diversidade de impressões particulares sobre a rede de moradores ea instituição que a abriga comprova a natureza singularizante do processo de envelhecimento.This work searchs to analyze the ways of the aging of the resident aged artists in Retiro do Artista Rio-Grandense de Porto Alegre, trying to understand the tensions between its memories of work in the art and its current circumstances of life. The theoreticiantechnician referencial used is Analysis of Speech of the French school in the approach considered by Dominique Maingueneau. The used parts of text for this analysis were withdrawn from interviews with three living aged artists of this institution, with ages between the 62 and 76 years. It was broken of four thematic axles to make the description/interpretation of the speech produced by the profile composed by the research citizens: the aged being and the process of aging, the removal of the professional artistic work, the life in the institution and the look at the past, the present and the wait of the future. The detected, described and interpreted sense effects from the research corpus, formed for the detached parts of speech, had shown that the institutional proposal of the house, although to answer to a social necessity to shelter devoid aged artists, does not reach to fill its proposal to offer to the users a space to contact with themselves after an afflicted personal and work life, that resulted in an oldness in poverty. The diverse factors of stress and emotional difficulties of the inhabitants display them to conflicts in the domain of tying. The abilities developed in the experience of a life work as artists are used at present as strategies of confrontation of the related factors. The diversity of particular impressions on the net of inhabitants and on the institution itself by citizens proves the particularly singular nature of the aging process.
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Lindgren, Daniel, and Petter Sjöberg. "Long-term Abnormal Returns Following Share Repurchase Announcements : Do repurchasing firms outperform the market?" Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-354789.
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We study the long-term performance of companies listed on the Stockholm Stock Exchange that announced their intention to repurchase shares between the years of 2005 and 2013. We test the hypothesis that the market underreacts to share repurchase announcements and that repurchasing firms consequently outperform the market in the following years. We find that repurchasing firms yield a cumulative abnormal return of 15.76 percent, significant at the 1 percent level, over the four years following the announcement. To address the concern that microcaps may be driving the results, we also investigate the differences in abnormal returns between companies of different sizes. We form three portfolios based on market capitalization and find that the large, medium-sized and small companies yield 14.34 percent, 20.13 percent and 6.61 percent respectively.Vi studerar den långsiktiga avvikelseavkastningen för företag noterade på Stockholmsbörsen som annonserat aktieåterköp mellan åren 2005 och 2013. Vi testar hypotesen att marknaden underreagerar på dessa annonseringar och att aktieåterköpande företag överpresterar marknaden de nästkommande åren. Vi finner att företag som återköper aktier ger en kumulativ abnormal avkastning på 15,76 %, signifikant på enprocentsnivån, under fyra år efter att företaget annonserat ett aktieåterköpsprogram. För att bemöta kritik mot tidigare anomaliforskning om att microcaps ofta snedvrider resultaten, undersöker vi skillnader i avvikelseavkastning mellan företag i olika storlek. Vi skapar tre portföljer baserat på företagens marknadsvärde och finner att stora, mellanstora och små företag genererar en kumulativ avvikelseavkastning på 14,34 %, 20,13 % samt 6,61 %.
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Lundvik, Lina. "Arbetsåtergång och självskattad hälsa hos långtidssjukskrivna individer med tidsbegränsad sjukersättning." Thesis, Uppsala universitet, Institutionen för folkhälso- och vårdvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159937.
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Syfte: Syftet med denna studie var att kartlägga långtidssjukskrivnas hälsa före och efter avslutad intervention samt studera vilka faktorer som hindrat alternativt främjat återgång i arbete hos individer med tidsbegränsad sjukersättning. Metod: Studien baseras på data från EU-projektet ”SAMKLANG” som är en longitudinell interventionsstudie. Data har samlats in på 59 långtidssjukskrivna deltagare via enkäter både före projektstart och ett år efter och dels har data samlats in kvalitativt genom semistrukturerade intervjuer med 13 deltagare efter det att projektet avslutats. Intervjudeltagarna var indelade i två grupper (de som hade återgått i arbete/studier och de som fortfarande var sjukskrivna). Interventionen bygger på både behandling och samverkan mellan organisationer som är involverade i rehabilitering av personer som har ett år kvar av sin tid i sjukersättning. Resultatet från enkäterna analyserades fram via ANOVA upprepad mätning och data från intervjuerna analyserades via innehållsanalys. Resultat: Huvudresultaten från den kvantitativa delstudien visade att det inte fanns någon skillnad mellan de som efter ett år återgått i arbete/studier, arbetsträning alternativt de som fortfarande var sjukskrivna gällande kön, ålder eller utbildningsnivå. Den självskattade depressions- och ångestnivån minskade och självskattad hälsa och inre kontroll ökade signifikant över tid för den grupp som kommit ut i arbete efter projektet jämfört med de två andra grupperna. Den kvalitativa analysen av intervjuerna identifierade följande tema som stödjande faktorer för arbetsåtergång: att besitta egen drivkraft, ha en insikt om arbetets mervärde och att hitta en balans mellan krav- kontroll-stöd. Det tema som beskriver hur myndigheter kan hjälpa och stödja långtidssjukskrivna tillbaks i arbete är: trygghet med mer vårdkompetens och att synliggöra individuella behov. Slutsats: Att återgå i arbete för en tidigare långtidssjukskriven person kopplas till bättre självrapporterad hälsa med mindre depression och ångestbesvär, en starkare känsla av inre kontroll och en högre tilltro till egen förmåga jämfört med om personer fortfarande är sjukskrivna. Framgångsfaktorer för arbetsåtergång är balans mellan krav, kontroll och stöd för individen och en egen motivation att återgå i arbete. För att underlätta arbetsåtergång hos långtidssjukskrivna bör myndigheter och inblandade parter samverka med vård, erbjuda trygghet och synliggöra varje enskild individs behov av rehabilitering.Aim: The aim of this study was to investigate long term sickness absentees’ health status before and after an intervention. Furthermore, to gain deeper understanding of factors related to promoting and preventing return to work for people with limited sick leave compensation. Method: The study is based on data from the EU-funded project ”SAMKLANG” which is a longitudinal intervention study. Data has been collected from 59 long term absentees though questionnaires conducted before and one year after the start of the project. Data has also been collected through semi structured interviews from 13 participants after the end of the project. They were divided into two groups (those who had returned to work/studies or had an internship and those who still were sickness absent). The intervention is based on treatment as well as cooperation between organizations involved in a rehabilitation process for people with one year of sick leave compensation remaining. The results from the surveys were analyzed with ANOVA for repeated measures and data from the interviews were analyzed using content analysis. Result: The main result from the quantitative part of this study showed no significant difference in return to work between those who had returned to work or studies, been on internships and those who still were sickness absent based on sex, age and education. The amount of self-rated depression and anxiety levels were reduced and the self-rated health and internal control were significant induced over time for the group who returned to work after the project compared to the other two groups. From the qualitative analyze of the interviews following theme was identified as supporting factors for returning to work: having own motivation, realized the positive in having a job and to have balance between demand-control-support. The theme that describes how the authority can help and support people with long term sickness absence back to work is: security with more competence in healthcare and make individual needs visible. Conclusion: Return to work for a former long term sickness absence is associated with better self-rated health with less depression and anxiety, a stronger feeling of internal control and a higher self-efficacy compared to if persons still were sickness absent. Factors for success in return to work is balance between demand-control-support for the individual and an own motivation to return to work. The authority can facilitate return to work among people with long term sickness absence by interact more with health-care services, offer security and make every individuals need for rehabilitation visible.
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Fredriksson, Malin. "Monte Carlo Simulations of Portfolios Allocated with Structured Products : A method to see the effect on risk and return for long time horizons." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-144162.
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Structured products are complex non-linear financial instruments that make it difficult to calculate their future risk and return. Two categories of structured products are Capital Protected and Participation notes, which are built by bonds and options. Since the structured products are non-linear, it is difficult to asses their long-term risk today. This study, conducted at Nordea Markets, focuses on the risk of structured products and how the risk and return in a portfolio changes when we include structured products into it. Nordea can only calculate the one-year risk with their current risk advisory tool, which makes long time predictions difficult. To solve this problem, we have simulated portfolios and structured products over a five-year time horizon with the Monte Carlo method. To investigate how the structured product allocations behave in different conditions, we have developed three test methods and a ranking program. The first test method measures how different underlying assets changes the risk and return in the portfolio allocations. The second test method varies the drift, volatility, and correlation for both the underlying asset and the portfolio to see how these parameters changes the risk and return. The third test method simulates a crisis market with high correlations and low drift. All these tests go through the ranking program, the most important part, where the different allocations are compared against the original portfolio to decide when the allocations perform better. The ranking is based on multiple risk measures, but the focus in this study is at using Expected Shortfall for risk while the expected return is used for ranking the return. We used five different reference portfolios and six different structured products with specific parameters in an example run where the ranking program and all three test methods are used. We found that the properties of the reference portfolio and the structured product’s underlying are significant and affect the performance the most. In the example run it was possible to find preferable cases for all structured products but some performed better than others. The test methods revealed many aspects of portfolio allocation with structured products, such as the decrease in portfolio risk for Capital Protected notes and increase in portfolio return for Participation notes. Our ranking program proved to be useful in the sense that it simplifies the result interpretations.
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Testa, Carlos Henrique Rodrigues. "O papel certificador dos fundos de private equity e venture capital na qualidade das empresas estreantes na BM&FBovespa." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/12/12136/tde-28082013-132623/.
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O presente trabalho buscou investigar, sob a perspectiva da Teoria da Sinalização, o papel certificador dos fundos de Private Equity e Venture Capital (PE/VC) sobre a qualidade das empresas estreantes na BM&FBovespa (IPOs). Para isso, propôs-se um estudo de evento visando constatar a existência de retornos anormais acumulados (proxy para qualidade dos IPOs) em carteiras de investimentos compostas por ações provenientes dos IPOs realizados na BM&FBovespa, no período de janeiro de 2004 a dezembro de 2007. As hipóteses do trabalho foram verificadas por meio de três procedimentos distintos: teste de médias, método CAPM e regressões CAR. Os resultados dos testes de médias indicaram que os IPOs de empresas investidas por fundos de PE/VC apresentaram desempenhos de curto, médio e longo prazo (até 5 anos) superiores e estatisticamente significantes em relação às empresas não investidas. Além disso, os resultados demonstraram que quanto maior a participação dos fundos de PE/VC na empresa investida, melhor o desempenho de longo prazo. Os resultados do método CAPM indicaram que os retornos observados dos IPOs foram inferiores aos retornos esperados, dado o nível de risco assumido. As regressões CAR verificaram se a presença de fundos de PE/VC explica retornos anormais positivos dos IPOs, após controle de outros fatores. As evidências encontradas sugerem que a presença de fundos de PE/VC nas empresas estreantes na BM&FBovespa possui efeito positivo sobre os retornos anormais acumulados dos IPOs e, quanto maior a participação acionária detida pelo fundo de PE/VC na empresa, no momento imediatamente anterior ao IPO, maiores os retornos anormais acumulados de longo prazo. Em geral, os retornos das amostras analisadas foram inferiores ao desempenho do índice Ibovespa, podendo ser um reflexo da crise financeira mundial, com maior impacto sobre empresas com histórico recente na bolsa (IPOs), em relação às empresas tradicionais (blue chips) que integram o Ibovespa.This study investigated, under the perspective of Signaling Theory, the certifier role of Private Equity and Venture Capital investments (PE/VC) on the quality of initial public offerings (IPOs) at BM&FBovespa. It was proposed an event study in order to examine the existence of cumulative abnormal returns (proxy for IPOs quality) in portfolios composed of stocks from the IPOs occurred on BM&FBovespa, from January 2004 to December 2007. The hypotheses of this study were verified by three different procedures: test for equality of means, CAPM method and CAR regressions. The tests for equality of means suggested that the companies that received investments of PE/VC, before the IPOs, had statistical significant short, medium and long-term performances (up to 5 years) higher than non-invested companies. Besides that, the results showed that the higher the equity PE/VC held in the companies, before the IPO, better the long-term yield. The CAPM method indicated that the observed returns were lower than the expected returns, given the level of risk assumed. CAR regressions examined whether the presence of PE/VC explains positive abnormal returns of the IPOs, after controlling for other factors. The evidence suggests that the presence of PE/VC has positive effect on the cumulative abnormal returns on the IPOs, and the higher the equity held by the PE/VC in the firm, immediately before the IPO, the greater the long-term cumulative abnormal returns. In general, the returns of the samples were below Ibovespa index, which may be a reflection of the global financial crisis, with greater impact on companies with recent history in the stock market (IPOs), compared to traditional firms (blue chips) that integrate Ibovespa.
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Ågstrand, Mikaela. "Långtidssjukskrivning för psykisk ohälsa : Kvinnors upplevelser av att vara sjukskrivna och återvända till arbetet." Thesis, Mälardalens högskola, Akademin för hälsa, vård och välfärd, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40906.
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Idag är psykisk ohälsa den vanligaste orsaken till långtidssjukskrivning i Sverige. Denna studie syftade till att undersöka vad det innebär för kvinnor att vara långtidssjukskrivna för psykisk ohälsa och återvända till arbetet. Datainsamlingen bestod av semistrukturerade intervjuer. Totalt intervjuades åtta kvinnor som varit sjukskrivna i minst två månader. Kvinnorna var bosatta i Uppsala län, Västmanlands län och Västra Götalands län. Dataanalysen genomfördes i linje med de riktlinjer IPA-metoden förespråkar. Resultatet påvisar att det förekommer en del svårigheter med att vara långtidssjukskriven för psykisk ohälsa. Mest framträdande var en känsla av orkeslöshet och isolering. Arbetsåtergången var utformad på olika sätt, den vanligaste rehabiliteringsåtgärden var arbetsanpassning. Studiens resultat tyder på att arbetsplatser saknar tydliga rutiner för arbetsåtergång vid långtidssjukskrivning för psykisk ohälsa. Vidare framgick det att delaktighet och inflytande, lyhörda chefer och den egna viljan var viktiga utgångspunkter för en god arbetsåtergång. Socialt stöd betraktades som en viktig förutsättning under hela sjukskrivningsförloppet.
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Lövkvist, Christina, and Therese Höglind. "Chefer i rehabiliteringskedjan." Thesis, Kristianstad University, School of Health and Society, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-6712.
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Vocational rehabilitation is an ongoing issue that directly or indirectly affects everyone at a workplace. In recent years, laws and rules have changed. The 1st July 2008 changes were made in the General Insurance Act (SFS 1962:381). These changes have meant that there is now a so-called rehabilitation chain. The rehabilitation chain contains time frames for when sick people will have their ability to work tested against their normal work or to other jobs. If a person is considered having enough capacity to be able to work he or she will lose their entitlement to sick pay.
The aim of our study is to investigate managers’ perceptions of the new rehabilitation chain, with a focus on vocational rehabilitation of long-term sick to get them back to work.
The method used was qualitative and data collection was done through nine semi-structured interviews. The results showed that the managers we interviewed believe that their primary responsibility in the rehabilitation work is to be the link between sick leave and workplace. The managers generally think that the introduction of the rehabilitation chain is a good thing. It has become clearer with what to do when an employee becomes ill and the timeframes provides a degree of security as the managers know when different things will happen. Our results also show that managers believe that cooperation with external actors such as social insurance has become easier since the rehabilitation chain was introduced. Some believe that the timeframes may be too tight and they are worried that the individual is forgotten in the process. The conclusion of our study was that there has been a need for a more active and transparent process of rehabilitation and this need has been met by the rehabilitation chain. Although the managers think that the rehabilitation work has become clearer, there is some disagreement in the way of working with sick leave. Some managers say for example that they are still doing so-called rehabilitation investigations, although it shifted responsibility from themselves to the Social Insurance Agency.
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Osipavičiūtė, Aušra. "Finansinio kintamumo modeliavimas apibendrintuoju Gegenbauer-LARCH modeliu." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090908_201757-95006.
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Darbe siekiama aprašyti periodinį ilgos atminties finansinių laiko eilučių elgesį. Remiantis anksčiau sukurtais modeliais, siūlomas h-faktorių Gegenbauer-LARCH modelis, kuris į LARCH tipo proceso sąlyginės dispersijos lygtį įtraukia apibendrintą ilgos atminties filtrą, paremtą Gegenbauer polinomais. Darbe pateikiama anksčiau sukurtų modelių, skirtų finansinių aktyvų grąžų kintamumo modeliavimui, apžvalga. Remiantis ankstesnėmis idėjomis ir darbais, sukonstruojamas naujas Gegenbauer-LARCH modelis, kuriam tikrinama kovariacijos stacionarumo sąlyga. Pateikiamos modeliuotos h-faktorių Gegenbauer-LARCH proceso trajektorijos. Sukurtas modelis taikomas realiems Euro-Dolerio valiutų kurso duomenims. Identifikuotas modelio parametrai vertinami LUDE algoritmu, kuris maksimizuoja didžiausio tikėtinumo funkciją. Atliekama modelio adekvatumo analizė. Darbo pabaigoje pateikiamos išvados ir rekomendacijos.On the ground of previous works and ideas a new class of models which describe long memory periodic behaviour in a time varying volatility of financial returns is introduced. Generalised periodic long-memory filters, based on Gegenbauer polynomials, are included into volatility equation of LARCH model and capture long memory periodic behaviour of the data. Thus, a new type of model called h-factor Gegenbauer-LARCH is presented. Moreover, a covariance stationarity condition is checked for one factor Gegenbauer-LARCH model. Also, generated processes are demonstrated. Furthermore, h-factor Gegenbauer-LARCH model is applied to Euro-Dollar hourly exchange rate returns. Identified model is estimated by means of LUDE algorithm which maximizes maximum likelihood function. The adequasy of the model is checked by reviewing residuals behaviour. Concerning empirical results the following conclusion is drawn: • Although model captures specific characteristics of the data such as slowly decaying periodic behaviour of autocorrelation function and pronounced peaks in periodogram but residuals analysis shows that model should be improved. Bordignon, Caporin, Lisi suggest that all possible frequencies were included to the model because higher frequencies might not be obvious from autocorrelation function or periodogram. However, we face computer capability problem. As a matter of fact, we cannot estimate a more complex model. Inclusion of autoregresive coefficients into the model did not... [to full text]
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Siziba, Innocent. "The implications of forcing beta from one down towards beta neutrality on key risk and return and other measures in long only mean variance efficient equity portfolios." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/52320.
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Hedge fund strategies such as the equity market neutral have provided significant risk adjusted returns in the form of alpha, but their short selling and debt has made them generally costly and prone to failure under changing market conditions. There is a need to isolate the benefits of long short equity hedging without the added costs and dangers associated with short selling and leverage.
Isolating the set of lowest possible market beta long equity portfolios that can mimick long short equity hedging can provide investors cost effective hedge fund replication. A systematic procedure involving mean variance optimisation and quantitative analytical techniques was used to characterise the behaviour of targeted beta portfolios on key risk and return metrics and variables as a beta constraint was applied to optimisation on a finely calibrated scale of one down to zero.
This research was able to isolate a sample from the JSE/FTSE Top 40 Index into a solution set (P) of low beta portfolio alternatives extending from a target beta value of 0.475 to a beta value of 0.600 which was identified, characterised and disaggregated into definitive solution tuples P1 (beta 0.600, beta 0.575, beta 0.550) and P2 (beta 0.525, beta 0.500, beta 0.475).Mini Dissertation (MBA)--University of Pretoria, 2015.
vn2016
Gordon Institute of Business Science (GIBS)
MBA
Unrestricted
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Rader, Jordan D. "Loss of normal feedwater ATWS for Vogtle Electric Generating Plant using RETRAN-02." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31741.
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Thesis (M. S.)--Nuclear Engineering, Georgia Institute of Technology, 2010.Committee Chair: Abdel-Khalik, Said I.; Committee Member: Ghiaasiaan, S. Mostafa; Committee Member: Hertel, Nolan E. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Widemark, Oskar, and Sebastian Ohlström. "Private Equity och nyintroduktioners långsiktiga avkastning." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-319380.
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I denna studie av nyintroduktioner på börsen (IPO:er), från 2006 till 2014, på börsen Nasdaq Nordic (som består av Nasdaqs börser i Finland, Sverige, Danmark och Island) undersöker vi om avkastningen för private equity-ägda företags IPO:er på lång sikt är högre än hos de icke private equity-ägda företagens IPO:er. Vi mäter den långsiktiga avkastningen genom att använda måttet BHAR och jämföra de två grupperna sinsemellan. Vi finner att private equity- ägda företags IPO:er har en högre avkastning än de icke private equity-ägda företagens IPO:er över de båda tidsperioderna 1 och 3 år.In this study of IPOs, from 2006 until 2014, of the Nasdaq Nordic market (main markets of Finland, Sweden, Denmark and Iceland) we are investigating whether the long-run return of private equity backed IPOs significantly differs from the return of non-private equity backed IPOs. We measure the long-run performance by using the simple BHAR and comparing the two samples. We find that private equity-backed IPOs significantly outperform non-private equity backed companies over the measured time periods, 1 and 3 years.
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von, Celsing Anna-Sophia. "Early risk assessment of long-term sick leave among patients in primary health care : risk factors, assessment tools, multidisciplinary intervention, and patients’ views on sick leave conclusion." Doctoral thesis, Uppsala universitet, Allmänmedicin och preventivmedicin, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280414.
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Background. Long-term sick leave is one of the main risk factors for permanent exit out of the labour market. The longer the duration of sickness absence, the less likely sick leave conclusion. Objectives and Methods. The aims were to analyse possible determinants of sick leave conclusion and their relative impacts, to analyse the properties of two models for the assessment of sick leave conclusion, to study the impact of a multidisciplinary vocational intervention for sick leave conclusion in a high-risk group for long-term sick leave compared to a matched-control group, and to compare the patients’ own assessment on chance to sick leave conclusion within 6 months with the assessment of a team of rehabilitation professionals. A prospective cohort study of 943 patients aged 18 to 63 years, sickness certified at a Primary Health Care Centre in Sweden during 8 months in 2004, and follow-up for three years. Results. Significant determinants increasing time to sick leave conclusion were number of sick leave days the year before baseline, age and a psychiatric diagnosis (F in ICD-10). Concordance between actual sick leave conclusion and that predicted by a computer-based model was 73-76% during the first 28-180 days in a manual model, and approximately 10% units higher in a computer based model. Three nomograms provided detailed information on the probability on sick leave conclusion. Before intervention started, the rehabilitation group had a 73% higher sick leave conclusion rate than the control group but during the rehabilitation programme period, a 51% lower conclusion rate, and after there were no significant differences between the groups. The patients’ and the rehabilitation teams’ assessment scores were highly correlated (r=0.49). Conclusions. Previous sick leave was the most influential variable associated with sick leave conclusion. A computer- based assessment model gave more detailed information on sick leave conclusion than a manual model. A multidisciplinary intervention declined sick leave in a high-risk group for long-term sick leave but after intervention there was no difference between groups. Patients’ own view on sick leave conclusion was highly correlated to the assessment of professionals’.
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Chen, Jin-Chi, and 陳俊吉. "The Long-Run Return of IPOs." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/38217057342376749057.
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碩士國立中山大學
企業管理學系
87
IPOs is popular topic, generally the outcomes of the topic are widely documented that in the short-term, IPOs have abnormal return, but in the long-run ,IPOs have either better return or poorer return. It had different answers. In my study, in section 1, I found that the CARs of IPOs including initial return all significantly had abnormal return, but if the IPOs excluding the initial return, half of the CARs were under-performed. From ARs, the results fingered out that in Taiwan IPOs have two-month honey moon period. So, we suggest investors join the honeymoon period as possible as one could. In section 2,3,I found that issue size 、age of company、 initial return、indu
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Hsu, Pei-Min, and 徐培珉. "Attention Effect and Long-term Stock Return." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79561323990462672393.
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碩士國立中興大學
財務金融系所
102
This paper studies how attention effect affects long-term stock return in Taiwan''s listed stock market. This paper hypothesizes that stock price will correct and reverse to fundamentals as a result of short-term attention-driven mispricing. In my methodology, we calculate attention effect indices to provide a quantitative indicator of the strength of attention effect. In empirical results, firstly, we find that attention effect index has significant negative impact on long-term stock return and the portfolio of high-index has negative mean return. we also find that long-term stock return is more sensitive to atten-tion effect during the financial crisis of 2007-2009 due to the behavior of investors'' flight-to-quality. Furthermore, long-term stock return of certain firms—small size, low B/M, young, high idiosyncratic risk—is also more sensitive to attention effect. Finally, we use some attention-based investment strategies and find that we can get good long-term stock return. Consistent with hypotheses, empirical results support that atten-tion-driven stock price will experience the process of mispricing to correction.
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He, Sz-Rung, and 何思蓉. "Skewness, Initial Return, and Long-Term Performance." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55558836940879969318.
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碩士輔仁大學
企業管理學系管理學碩士班
101
Previous studies have shown that initial public offerings stock (IPOs) produce abnormal returns higher than the market returns during the initial returns period. The Emerging Stock Market (ESM) and IPOs regulations are set to eliminate this phenomenon and raise market efficiency. However, results showed that those initiatives have weak effects. Previous study also showed that initial public offerings with high expected skewness experience significantly greater initial returns. According to studies, low liquidity in ESM raise up the price level. Therefore, it makes publicly held companies, underwriters and the IPO investors over optimism, and lead to wrong pricing and buying decisions. Because they tend to decide the IPO price or choose the IPO stock referring to ESM’s price This study aims to find out how would skewness affect initial returns and long term return. Results suggest that initial returns and overreaction greater while skewness is higher. Also, higher skewness leads to poor long term performance.
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Chang, Wan-Chin, and 張婉琴. "Multiple Stock Repurchase and Long-term Abnormal Return." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85165789351036568446.
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碩士淡江大學
財務金融學系碩士在職專班
96
In this study, we discuss the long-term abnormal return after executing multiple stock repurchases on several listed companies in Taiwan. Afterwards, by applying the Event Study Methodology, we further discuss the relationship between the variables（including announced repurchase ratio, repurchase ratio, book-to-market ratio, the percentage of insider shareholding, the percentage of shares mortgaged by directors, and the scale of firms） and the Cumulative Abnormal Return （CAR）. The results are as follows：The correlation between the repurchase ratio and CAR for 1 year is significant negative, but it is not significant related to CAR for 3 years. The other variables are not significant related to CAR. It suggests that if a company attempts to increase its stock price merely by announcing stock repurchases, the repetitive announcements will eventually cause negligent effects on the market.
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LIN, JIA-MING, and 林家鳴. "Improve the return of long strangle by return in Taiwan SE weighted index." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/q5q9dp.
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碩士逢甲大學
統計學系統計與精算碩士班
107
In Taiwan, the volume of options has a massive increase compared with 2001. Both futures and options are derivative instruments, but futures are more popular than options in Taiwan because the retail trader has little understanding of how it works. Though both of them are derived from the underlying asset that they track, the price of options has combined with complicated elements. Options are low cost and flexible financial instruments if we can understand price and strategies, its more friendly than stock, futures, bond, fund. This study uses the Taiwan index options, try to find out the relationship between historical volatility and strangle. The evidence shows that the Taiwan index has a large move at a specific point in time. Due to the option is a nearby contract, there is a political or international effect on the market. Thus we can gain profit out of expecting. Use appropriate strategy at a specific point in time with risk control can improve the traders performance.
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Chen, Yu-ting, and 陳玉亭. "Long Term Equity Return Models for Equity-Linked Guarantees." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/63412735876628387718.
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碩士逢甲大學
統計與精算所
96
This paper mainly investigates long term equity return in the Taiwan stock market. We attempted to find the optimal model among and perform diagnostic analysis of the stochastic asset models, such as the independent lognormal model, the ARCH-type model, the Regime-Switching Lognormal model, and the Stochastic Log-Volatility model, all of which have been proposed by the American Academy of Actuaries. In addition, the most suitable long term equity model was determined. In the empirical study of the Taiwan stock market, the parameter estimations were carried out using maximum likelihood estimate and efficient moment of method. Following, we compared log-likelihood, Akaike Information Criterion and Schwartz Bayesian Criterion and drew Quantile-Quantile plots to test tails, to determine the appropriateness of models. Finally, Conditional Tail Expectation risk measures of stochastic equity models were estimated from simulation of the liability of a guaranteed minimum accumulation benefit contract. The results indicate that the generalized autoregressive conditional heteroskedastic and regime switching log normal models perform much better than other considered models for analyzing the Taiwan financial market.