Magister Legum - LLM

Cette thèse aborde la question de la fiabilité du temps de transport. L’étude de la fiabilité du temps de transport trouve ses sources dans le fait que, dans bien des situations, le temps de transport n’est pas certain, mais aléatoire. De nombreux évènements peuvent en effet modifier le temps de transport prévu par les opérateurs ou espéré par les usagers. Par ailleurs, lors de l’évaluation socioéconomique de projets d’investissement en infrastructure de transport, il peut exister un arbitrage entre gain de temps et gain de fiabilité. Or, comme la fiabilité est encore à l’heure actuelle, difficilement intégrable dans ce type d’évaluation, ces projets d’investissement voient leur rentabilité collective sous-estimée conduisant à leurs reports. Il émerge ainsi trois problématiques majeures relatives à l’étude de la fiabilité du temps de transport : sa mesure, sa valorisation monétaire (i.e. la disposition à payer des individus pour améliorer la fiabilité du temps de transport) et enfin, sa prise en compte dans les analyses coûts-avantages. Un premier chapitre permet d’adapter les mesures usuelles de la fiabilité du temps de transport appliquées dans le cadre du transport routier, aux modes de transport collectif (fer et aérien plus particulièrement). Nous proposons également une nouvelle mesure de la fiabilité, le Delay-at-Risk (DaR) inspiré de la littérature financière. Le DaR est une transposition de la mesure de la Value-at-Risk (V aR) à l’économie des transports. Cette mesure est plus utile du point de vue des usagers pour la planification des trajets avec correspondance que les autres mesures. Le deuxième chapitre a pour principal objectif de déterminer la disposition à payer des individus pour améliorer la fiabilité du temps de transport. Nous proposons un cadre théorique inspiré de la théorie de la décision en univers risqué à partir duquel nous définissons la préférence des individus à l’égard de la fiabilité (i.e. reliabilityproneness) ainsi que la prudence. Nous développons des nouvelles mesures de la fiabilité du temps de transport, exprimées comme des primes de risque : la reliability-premium et la V OR. La reliability-premium détermine le temps de transport maximum supplémentaire qu’un individu est prêt à accepter pour supprimer l’intégralité du risque sur le temps de transport. La V OR, quant à elle, se définit comme la disposition maximale à payer d’un individu pour supprimer l’intégralité du risque sur le temps de transport. Par ailleurs, nous établissons également les conséquences sur la valeur du temps (V TTS) et de la fiabilité (V OR), de la prise en considération de l’attitude à l’égard du risque sur le temps de transport des usagers (aversion et prudence). Le dernier chapitre de cette thèse a pour objet d’intégrer la fiabilité dans les évaluations socioéconomiques de projet d’investissement et plus particulièrement dans la détermination du surplus des usagers. Nous mettonsen exergue un effet de diffusion des gains de fiabilité par rapport aux gains de temps. Ainsi, nous proposons des recommandations quant à l’arbitrage entre les projets générateurs de gain de temps et de gain de fiabilité en fonction des valeurs monétaires du temps (V TTS) et de la fiabilité (V OR). / This thesis deals with the issue of travel time reliability. The study of travel time reliability emerges from the fact that in many situations, travel time is random. Many events can change the travel time forecasted by operators or expected by users. Moreover, a tradeoff may exist between time and reliability benefits when evaluating socio economic appraisal of transport infrastructure. However, since reliability is still difficult to integrate in this type of evaluation, investment projects’ collective profitability is underestimated and often postponed. Thus, three main issues of travel time reliability analysis emerge: measurement, monetary valuation and implication for cost benefit analysis. This thesis is organized in three chapters. The first chapter adapts the measure of travel time reliability typically used in the road transport context to the collective modes (rail and air, in particular). We also develop a new reliability measure: the Delay-at-Risk (DaR). DaR is an implementation of the Value-at-Risk (V aR) measure into the transport economic framework. The DaR seem to be relevant and understandable information for the users, especially to plan their travel and avoid missing their connections. The main objective of the second chapter is to define the users’ willingness to pay to improve travel time reliability. We present a theoretical framework based on decision theory under risk. We introduce the concept of reliability-proneness (i.e. travel time risk aversion) and prudence. We develop new measures of travel time reliability expressed as risk premium: the reliability-premium and V OR. The reliability-premium is the maximum amount of additional travel time that an individual is willing to accept to escape all the risk of travel time. The V OR is defined as the maximum monetary amount that an individual is willing to pay to escape all the risk of travel time. Furthermore, we also establish the link with attitudes towards risks of travel time (aversion and prudence) and the impact of the value of travel time (V TTS) and the value of reliability (V OR). The final chapter of this thesis integrates reliability in investments project’s socioeconomic appraisal. More particularly, it allows to determine users’ surplus valuation. We highlight a diffusion effect of reliability benefits with regard to travel time benefits. Thus, we propose recommendations regarding the tradeoff between projects that generate time benefits compared with reliability benefits, according to the monetary values of travel time(V TTS) and reliability (V OR).

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In dem Forschungsvorhaben wurde das Konzept eines simulations-basierten Assistenzsystems zur Unterstützung von Disponenten bei der Pflege der Parameter eines ERP-Systems im laufenden Betrieb entwickelt. Anhand einer Ampelgrafik zeigt das Assistenzsystem einem Disponenten Handlungsbedarf bei der Parameterpflege an, sofern durch eine andere Parametereinstellung ein höherer Zielerreichungsgrad für zukünftige Perioden erzielt werden kann. Eine alternative Parametereinstellung wird durch das Assistenzsystem vorgeschlagen.

Magister Artium (Psychology) - MA(Psych) / The study aims to ascertain the attitudinal disposition of disabled individuals towards their own career development and advancement. Results indicate a positive attitudinal disposition. One hundred and three physically disabled workers constituted the sample, which consisted of 48 males and 55 females. Of the sample 75 had qualifications of matric and below and 28 that of above matric. Questionnaires were distributed to one hundred and forty five subjects associated with a Network for the Disabled, with a response rate of one hundred and three. Analysis of the respondent's actual responses indicate that more than half of the matric and below respondents would like to move into higher job levels. As training is but one initiative for career development, it is important to reflect that the greater proportion of white collar and blue collar status respondents feel that the opportunity to develop their career with further training is motivating. However, only a specified total of respondents pursued this initiative. A bigger proportion of the sample specified that they have done additional training courses, where more than half of this proportion feel that to do training courses motivate them within the context of career development and lesser proportion of them have a greater positive disposition about this. While significant associations were found between career development and further training opportunities, age was found not to have any influence on career development for this sample. Lastly, the limitations of the study are discussed with further recommendations and implications of the research findings in closure.

The South African Department of Basic Education (2011) has articulated the need for learners to think critically. The development of critical thinking skills has therefore been explicitly included in various education policies, such as the National Curriculum Statement Grades R-12. Technology, a relatively new subject in South African schools, provides many opportunities to foster critical thinking skills through, for example, problem solving. Technology offers a wide spectrum of problems – ranging from well-structured to illstructured problems. Well-structured problems are constrained problems with convergent solutions and are the most commonly found problems in schools and universities, but ill-structured problems have multiple possible solutions and solutions paths, which often lead to uncertainty about, for example, the concepts, rules, and principles required to solve the problem. This is particularly true with regard to teaching technology, where there is the added complexity resultant from the designing of solutions (artefacts) to ill-structured problems. This calls for teachers with certain habits of mind, who will be able to nurture a positive disposition toward critical thinking in learners. Facione (2000) points out that engendering the desire to use critical thinking as a means of problem solving prepares the ground for teaching and learning critical thinking skills. Teachers, however, must be willing to use these opportunities to cultivate critical thinking skills in the classroom. While much research has been done on Critical Thinking skills, there is a paucity of literature about teachers’ disposition toward Critical Thinking. This study sought to investigate technology teachers’ disposition toward critical thinking with reference to their habits of mind. Profiling technology teachers’ disposition toward critical thinking can enhance our understanding of the extent to which they are positively or negatively disposed toward critical thinking (CT) in terms of their habits of mind. Such understanding can inform, inter alia, teacher training and curricula in order to reciprocally enhance critical thinking skills and the required habits of mind needed to teach technology The study used a survey design to investigate South African Technology teachers’ disposition toward CT. Grades 8, and 9 technology teachers were targeted; they were invited via an email to participate in the study in which standard ethical protocols were followed. A link in the email directed the participants to an online survey collecting data with 42 statements. Participants were asked to rate their level of agreement with each statement on a six-point scale. The statements were derived from the seven habits of mind as identified by Facione. These are: Self-confidence, Inquisitiveness, Systematicity, Analyticity, Truth-seeking, Open-mindedness and Maturity of Judgment. Half of the statements were formulated to express a clearly favourable disposition toward CT, while the other half were framed to be clearly unfavourable. The frequency of responses in terms of each scale for each statement was counted in order to reveal trends regarding their habits of mind. The research findings reveal that this sample seems to be positively disposed toward CT. The habits of mind that recorded the highest scores were Self-confidence, Inquisitiveness, and Systematicity. The habits of mind that recorded the lowest scores were Open-mindedness and Maturity of Judgment. Females outperformed males in four of the seven habits of mind. Male and female participants scored an equal balance percentage toward Self-confidence and male participants outperformed females in Truth-seeking and Analyticity. Further research is needed to investigate how the disposition and practice of technology teachers encourage critical thinking skills in the classroom. / Dissertation (MEd)--University of Pretoria 2019. / pt2021 / Science, Mathematics and Technology Education / MEd / Unrestricted

The importance of a positive, caring relationship with students in the classroom is under-researched in mathematics education. Research shows that a positive student-teacher relationship can have many long-term positive results for the student. Many of these results directly impact a student's productive disposition towards mathematics. At-risk students are in greater need of positive relationships and an increase in productive disposition. Using Joan Tronto's (1993) elements of care, I examine the student perspective of these kinds of relationships and how the student sees development of their own productive disposition.

Tin dioxide (SnO2) is considered one of the most promising anode materials for Lithium ion batteries (LIBs), due to its large theoretical capacity and natural abundance. However, its low electronic/ionic conductivities, large volume change during lithiation/delithiation and agglomeration prevent it from further commercial applications. In this thesis, we investigate modified SnO2 as a high energy density anode material for LIBs. Specifically two approaches are presented to improve battery performances. Firstly, SnO2 electrochemical performances were improved by surface modification using Atomic Layer Deposition (ALD). Ultrathin Al2O3 or HfO2 were coated on SnO2 electrodes. It was found that electrochemical performances had been enhanced after ALD deposition. In a second approach, we implemented a layer-by-layer (LBL) assembled graphene/carbon-coated hollow SnO2 spheres as anode material for LIBs. Our results indicated that the LBL assembled electrodes had high reversible lithium storage capacities even at high current densities. These superior electrochemical performances are attributed to the enhanced electronic conductivity and effective lithium diffusion, because of the interconnected graphene/carbon networks among nanoparticles of the hollow SnO2 spheres.

På aktiemarknaden finns det stora mängder kapital och en ansenlig del av detta kapital förvaltas aktivt av professionella fondförvaltare. Att psykologiska aspekter kan påverka beslut gällande investeringar är känt genom tidigare forskning, men huruvida professionella investerare påverkas av det vid investeringsbeslut är mindre känt. Studien syftar till att undersöka vilken påverkan de psykologiska fallgroparna disposition effect och herding har på förvaltare på svenska fondbolag. I undersökningen har åtta institutionella fondförvaltare deltagit och genom semistrukturerade intervjuer har ett antal teman fångats upp för att sedan analyseras. Utifrån den insamlade datan och efterföljande analys uppvisade förvaltarna tendenser till att falla för vissa aspekter av de psykologiska fallgroparna. Den fallgrop som studien fann starkast stöd för hos förvaltarna var benägenhet att falla i disposition effect, de tenderar att hålla sina förlorare för länge medans de släpper sina vinnare för tidigt.