Bakgrund: Utbredningen av dolda indexfonder har visat sig starkt relaterat till ett lands regelverk och avsaknad av konkurrens på fondmarknaden i form av uttalade indexfonder (Cremers et al. 2013). Då Sverige är ett av de länder som placerar sig i topp vad gäller utbredning av dolda indexfonder (Cremerset al. 2013), är detta remarkabelt med tanke på att Sverige har ett effektivt och välfungerande juridisktsystem (Heritage Foundation 2016). Detta har föranlett oss att undersöka förekomsten av doldaindexfonder i Sverige, samt identifiera och analysera möjliga orsaker till val av aktivitetsgrad utifrånsåväl yttre som inre faktorer. Syfte: Uppsatsen syfte är att med anledning av att det framkommit att dolda indexfonder är vanligt förekommande på den svenska fondmarknaden, undersöka aktivitetsgraden i svenska aktiefonder, samt identifiera och analysera möjliga orsaker till val av aktivitetsgrad. Genomförande: Studien genomförs med ett kvantitativt angreppssätt för att möjliggöra ett statistiskt säkerställt resultat kring aktiviteten på den svenska fondmarknaden. Aktivitetsgraden på den svenskafondmarknaden mäts, genom active share, för att sedan ligga till grund för tester angående hur olika karaktärsdrag påverkar en fonds aktivitet. Avslutningsvis undersöks hur studiens resultat kan kopplas till de spelregler som gäller på den svenska fondmarknaden. Slutsats: Studiens resultat visar på att drygt hälften, 52 %, av de påstått aktivt förvaltade fonderna under mätperioden 2005-2015, i själva verket är att betrakta som dolda indexfonder. Resultatet visar dock också på att det under mätperioden skett en kraftig förbättring av fonders aktivitetsgrad, samt att fler fonder förvaltas aktivt på den svenska marknaden. Fondens inriktning, såväl som om fonden är förvaltad av en storbank, har en signifikant negativ påverkan på fondens aktivitet. Det kan till stor del förklaras av att rådande regelverk och den svenska aktiemarknadens storlek, indirekt uppmuntrar fonder till en lägre aktivitetsgrad. / Background: The existence of closet index funds has been shown highly correlated to regulations andcompetition of explicit index funds on a market (Cremers et al. 2013). Despite its strong regulations andpresence of explicit index funds, studies have shown that Sweden has a high amount of closet indexfunds. This fact has led to our interest in examining the presence of closet index funds on the Swedish market, and to try to identify and analyze potential characteristics of a fund that affect its choice ofactivity rate. Aim: The aim of the study is, by reason of the proven high presence of closet index funds on the Swedish market, to examine the activity rate within the funds, and to identify and analyze potential characteristics that affects it. Completion: The study is conducted through quantitative research. The activity rate of the fund marketis measured through active share and then analyzed for how different characteristics influence the funds activity rate. Eventually the results of the study are being analyzed for if and how they are concatenated to the rules of the Swedish fund market. Conclusion: The result of the study shows that 52 % of the predicated actively managed funds were actually proven to be closet index funds. However, the result also shows that the degree of active share has generally risen, and that more funds are being actively managed in Sweden. The alignment of the fund, as well as if the fund is managed by a major bank, are proven to have a significant negative impactof the activity of the fund. This negative relationship is largely linked to the regulations as well as the size of the Swedish stock market, which creates incentives for low activity of the funds.

La surveillance d'entrepôts de produits chimiques est une opération délicate dans le sens où elle passe par une connaissance de la nature de chaque produit stocké, sur leur localisation, sur leur possible interaction et sur les actions à mettre en oeuvre en cas d'alerte. Pour faciliter cette gestion de stockage, cette thèse propose d'utiliser le concept de l'ambiant où le produit possède son propre système d'information et de communication sans fil de façon à le rendre intelligent et autonome. Cette thèse propose et développe un modèle de comportement interne de produit actif permettant une approche distribuée de sécurité active. Celui-ci permet d'aboutir à un protocole de communication de niveau applicatif à embarquer dans les produits actifs. Ce protocole est évalué de façon formelle en utilisant les Réseaux de Petri colorés hiérarchiques. Finalement, ce protocole est implémenté dans le simulateur Castalia/Omnet++ pour l'analyser dans plusieurs scénarii et aussi pour l'éprouver lors du passage à l'échelle. Les résultats montrent l'intérêt et la faisabilité du concept de produit actif / Monitoring of chemical product storage is a delicate operation in the sense that it requires knowledge of the nature of each stored product, their location, their interaction and possible actions to be implemented in case of emergency. To facilitate the storage management, this thesis proposes to use the concept of ambient where the product has its own information system and wireless communication so as to make it intelligent and autonomous. This thesis proposes and develops a model of internal behavior of active product that allows a distributed approach of active security. This can lead to a communication protocol of application level to embed the active products. This protocol is formally assessed using hierarchical colored Petri nets. Finally, this protocol is implemented in the simulator Castalia/Omnet++ to analyze it in several scenarios and also for the experience when going to scale. The results show the usefulness and feasibility of the concept of active product

Firstly, this thesis investigates the electrical power harmonics in an attempt to utilize harmonic current and its distortion power in a novel idea to reconvert the distortion power into useful power. This is done, in order to feed different DC or AC loads in single and three-phase power system by using passive or active filters and accordingly, develop a new topology of hybrid active power filter (HAPF). In addition, this circuit can be considered as a power factor corrector (PFC) because it reduces the total harmonic distortion (THD) and improves the power factor (PF). Secondly, this thesis works on a new design of active power factor correction (APFC) circuit presenting two circuits with the same design principle: the first design consists of two active switches without an external complex control circuit, while the second design contains a single active switch with an additional control circuit. The main contribution of this circuit is 98% reduction of the inductor's value used in the newly proposed PFC circuit in comparison with the conventional boost converter which may lead to a huge reduction in size, weight and the cost of the new PFC circuit. Also, the active switches depend on a carefully designed switching pattern that results in an elimination of the third order harmonic from the input source current which decreases the value of total current harmonic distortion (THDI) to (14%) and improves the input PF to (0.99). Consequently, the simplicity of the design without requiring a complex control circuit and without a snubber circuit plus the minimum size of inductor, gives the newly proposed circuit the superiority on other PFC circuits. Thirdly, this research aims to describe the distortion power through submitting two novel power terms called effective active power (Pef ) & reactive power (Qef ) terms with a new power diagram called Right-Angled Power Triangle (RAPT) Diagram. In addition, a novel de nition of total apparent power (St) has been submitted in order to illustrate the physical meaning of (St) in non-sinusoidal systems. The new RAPT Diagram is based on the orthogonality law and depends on geometrical summation to describe the relationship between different aspects (apparent-active-reactive) of power, and different components (total-fundamental distortion), drawing a bridge to connect the time domain with the frequency domain in a two-dimensional diagram.

Le transport des micro-organismes, comme par exemple les bactéries, par un fluide se retrouve au centre de thématiques de recherche dans des domaines aussi variés que de la biologie, l’écologie, l’ingénierie et la médecine.Ce manuscrit résume mon étude expérimentale du couplage entre le mouvement microscopique de la nage des bactéries et le mouvement advectif de l’écoulement.La première partie du manuscrit porte sur la rhéologie des suspensions d’E. coli sous faible taux de cisaillement. Pour cette condition, j’ai montré que les perturbations hydrodynamiques induites par la nage réduisent fortement la viscosité. Cet effet peut-être si important pour qu’il soit suffisant pour compenser entièrement la perte visqueuse due au cisaillement.La seconde partie traite des expériences d’écoulement réalisées dans un canal capillaire. Pour cette géométrie, j’ai examiné le couplage pour des écoulements caractérisés par un plus fort taux de cisaillement. Le suivi des trajectoires et le dénombrement des bactéries m’ont permis de mettre en évidence l’existence d’une composante de vitesse normal à la direction de l’écoulement. Cette dernière montre que les bactéries suivent des trajectoires hélicoïdales qui s’enroulent autour du centre du capillaire d’une façon antihoraires. Cette nouvelle composante est corrélée à la migration préférentielle des bactéries dans une couche de localisation proche de la paroi du canal.Les couplages rhéotactiques bactéries/fluide que j’ai étudiés doivent avoir des conséquences potentielles sur le transport en géométries plus complexes qui mériteraient une étude particulière. / The question of transfer and spreading of living microorganisms, such as motile bacteria, is of interest in biology and ecology, but also in engineering and medicine.The way in which the background flow affects the behavior of these bacteria and how it impacts the bacterial transport through complex systems and on the macroscopic properties of the fluid remains unclear and little studied.In this thesis, I present an experimental investigation of the coupling between the local bacteria-driven motion and the fluid advection.In a first part, I investigate the rheological response of E. coli suspensions when subjected to weak flows (low shear rates). I show that, in particular conditions, the microscopic perturbations caused by the bacteria highly impact on the macroscopic viscosity of the suspension, leading to a striking viscosity decrease and eventually overcoming the dissipative effects due to viscous loss. I also identify the relevant time scales defining this viscosity decrease.In a second part, I perform experiments in a capillary channel and analyze the coupling for stronger flows (higher shear rates), at which bacteria were found not to impact on the macroscopic viscosity. Instead, by analyzing the bacterial trajectories under flow, I evidence a breakage of the symmetry of this trajectories which, characterized by a preferential migration, causes the localization of the bacteria in a layer that extends over a significant distance from the surface, and thus potentially influencing the bacterial transport in complex systems

Cette thèse, réalisée en coopération avec l’ONERA, concerne la reconnaissance active d’objets 3D par un agent autonome muni d’une caméra d’observation. Alors qu’en reconnaissance passive les modalités d’acquisitions des observations sont imposées et génèrent parfois des ambiguïtés, la reconnaissance active exploite la possibilité de contrôler en ligne ces modalités d’acquisition au cours d’un processus d’inférence séquentiel dans le but de lever l’ambiguïté. L’objectif des travaux est d’établir des stratégies de planification dans l’acquisition de l’information avec le souci d’une mise en œuvre réaliste de la reconnaissance active. Le cadre de l’apprentissage statistique est pour cela mis à profit. La première partie des travaux se consacre à apprendre à planifier. Deux contraintes réalistes sont prise en compte : d’une part, une modélisation imparfaite des objets susceptible de générer des ambiguïtés supplémentaires - d’autre part, le budget d’apprentissage est coûteux (en temps, en énergie), donc limité. La deuxième partie des travaux s’attache à exploiter au mieux les observations au cours de la reconnaissance. La possibilité d’une reconnaissance active multi-échelles est étudiée pour permettre une interprétation au plus tôt dans le processus séquentiel d’acquisition de l’information. Les observations sont également utilisées pour estimer la pose de l’objet de manière robuste afin d’assurer la cohérence entre les modalités planifiées et celles réellement atteintes par l’agent visuel. / This PhD thesis, conducted in cooperation with ONERA, focuses on active 3D object recognition by an autonomous visual agent. Whereas in passive recognition, acquisition modalities of observations are fixed and may generate ambiguities, active recognition exploits the possibility of controling these modalities online in a sequential inference process in order to remove these ambiguities. The aim of this work is to design, in a statistical learning framework, planning strategies in the acquisition of information while achieving a realistic implementation of active recognition. The first part of the work is dedicated to learning to plan. Two realistic constraints are taken into account : on the one hand, planning with imperfect object modeling may generate further ambiguities - on the other hand, the learning cost (in time, energy) is expensive and therefore limited. The second part of this work focuses on maximally exploiting observations acquired during recognition. The possibility of an active multi-scale recognition is investigated to allow an interpretation as soon as the sequential acquisition process begins. Observations are also used to robustly estimate the pose of the object to ensure consistency between the planned and actual modality of the visual agent.

No description available.

Call number: LD2668 .T4 1978 A44 / Master of Science

Call number: LD2668 .T4 1978 R37 / Master of Science

This dissertation sets out to describe a pro-active process of public participation in urban planning, motivated by a lack of planning theory and also available South African legislation to describe how pro-active public participation is achieved in planning practice. Communicative planning theory advises on and describes public participation as being meaningful focussing on consensus between stakeholders. Empirical evidence of such public participation is however scarce, and also a critique against communicative planning theory. South African legislation supports and uses the concept of pro-active public participation but has few practical guidelines to facilitate such a public participation process in planning. The context of public participation in South Africa, in specifically two communities (Khuma and Stilfontein) in the North-West Province was the primary focus in describing a pro-active process of public participation. These two communities that had participated in a previous project where public participation was conducted and most importantly documented were specifically chosen because they represent two different community contexts, with Stilfontein being a community primarily consisting of retired mineworkers and Khuma a community that came into being as a result of forceful removals during the apartheid era. Furthermore the process of public participation that was followed was unique in this project as methods from community psychology were applied to guide communication. The importance of context and communication were identified as the most important aspects when conducting public participation pro-actively. The importance of communication and context should be considered if a pro- active process of public participation is to be conducted. It is a timeous process to consider the context of community members when conducting public participation, but it must be considered by spatial planners. The possibility of multidisciplinary teams facilitating public participation processes in planning should be considered. In this way planners can be assisted when conducting public participation processes. The refinement of legislation describing public participation may also be helpful in attempts to enhance pro-active processes in public participation. / MArt et Scien (Urban and Regional Planning), North-West University, Potchefstroom Campus, 2014

This dissertation sets out to describe a pro-active process of public participation in urban planning, motivated by a lack of planning theory and also available South African legislation to describe how pro-active public participation is achieved in planning practice. Communicative planning theory advises on and describes public participation as being meaningful focussing on consensus between stakeholders. Empirical evidence of such public participation is however scarce, and also a critique against communicative planning theory. South African legislation supports and uses the concept of pro-active public participation but has few practical guidelines to facilitate such a public participation process in planning. The context of public participation in South Africa, in specifically two communities (Khuma and Stilfontein) in the North-West Province was the primary focus in describing a pro-active process of public participation. These two communities that had participated in a previous project where public participation was conducted and most importantly documented were specifically chosen because they represent two different community contexts, with Stilfontein being a community primarily consisting of retired mineworkers and Khuma a community that came into being as a result of forceful removals during the apartheid era. Furthermore the process of public participation that was followed was unique in this project as methods from community psychology were applied to guide communication. The importance of context and communication were identified as the most important aspects when conducting public participation pro-actively. The importance of communication and context should be considered if a pro- active process of public participation is to be conducted. It is a timeous process to consider the context of community members when conducting public participation, but it must be considered by spatial planners. The possibility of multidisciplinary teams facilitating public participation processes in planning should be considered. In this way planners can be assisted when conducting public participation processes. The refinement of legislation describing public participation may also be helpful in attempts to enhance pro-active processes in public participation. / MArt et Scien (Urban and Regional Planning), North-West University, Potchefstroom Campus, 2014