Vocational interest is a dynamic, subjective, positive attraction towards a job, occupa tion or occupational field, based on the individual's perception of the structure of occupations and situations already experienced or expected to produce pleasurable feelings. Interest test tields are usually statistically derived from characteristics of individuals. This study develops and validates an interest test based on the perceived occupationaI structure. After examining various classification models and occupational classification systems, including work by Holland, Gati and Roe, a new network access model was pro­posed, based on many-to-many correspondence in set theory. Categories are arranged on levels. Choice of a category on one level precludes access to another category on the sanK level, but does not restrict access to categories on other levels. It was hypothesised that occupational structure is perceived to consist of the three levels of lields, environments and duties. Each category is a horizontal sirus group and includes all vertical status levels. Career choice is based on preferences at each level. 1200 jobs have been classified by allocation to one category on each level, and each is described by a field, environment and duty. The field-environment-duty (FED) system was operationalised in a ten minute interest test asking testees to choose from each level the three categories that interest them for a job. Extensive use was made of x to the power of 2 and empty sets to the power of two statistics in analysing nominal measurement scores. The FED test was applied to 1280 school-leavers in Gauteng, South Africa. Research supports Gati's division of occupations into "soft" (people-oriented occupations preferred by females), and "hard" (not-people-oriented occupations preferred by males), and introduces a third "neutral" division which is preferred equally by both males and females. Construct and concurrent validity was shown with the I 9Fll, VIQ, SDS and l6PF. In a four to five year longitudinal study the FED was found to predict future studies (80%) and occupation (86%). Research with working adults found that the FED test predicts concurrent job satisfaction, job tenure and self-assessed performance. Inter-rater reliability in assigning jobs to categories is around 80%. Test-retest reliability was significant to the 0,0001 level using the x to the power of 2 goodness of fit test. / Industrial and Organisational Psychology / D.Com. (Industrial Psychology)

Um die Auswirkung der Liberalisierung der EU-Erdgasmärkte auf die Macht der Marktteilnehmer zu studieren, entwickeln wir ein disaggregiertes Modell der eurasischen Erdgasversorgung. Wir modellieren die Abhängigkeiten zwischen den Spielern als kooperatives Spiel und berücksichtigen verschiedene Lösungen: den Shapley-Wert, den Nukleolus und den Kern. Im Kapitel 1 untersuchen wir die regionalen Auswirkungen der Liberalisierung des Zugangs zu den Übertragungsnetzen, sowie die Anreize für Fusionen und Kartelle. Im Kapitel 2 untersuchen wir die Auswirkung der Liberalisierung auf die Machtbalance zwischen den lokalen Champions, den Kunden und den Produzenten außerhalb EU. Wir unterscheiden zwischen zwei Schritten der Reform: 1.die Öffnung des Zugangs zu den Übertragungsnetzen und 2.die Öffnung des Zugangs zu den Vertriebssystemen. Für den Shapley-Wert finden wir geringe und heterogene Effekte des ersten Schritts. Die Auswirkungen des zweiten Schritts sind viel größer und ergeben ein klares Muster: alle lokalen Champions verlieren, während alle Kunden und alle externen Produzenten gewinnen. Da ein Drittel der Verluste der Champions innerhalb EU zu den Spielern im Ausland abfließt, können die aktuellen Reformen die Dominanz der bereits starken externen Produzenten verbessern. Wenn wir den Nukleolus heranziehen, profitieren die Produzenten außerhalb EU von der vollen Liberalisierung hingegen nicht. Im Kapitel 3 untersuchen wir die Beziehungen zwischen Shapley-Wert, Nukleolus und Kern. Für unser Modell ist der Shapley-Wert nie im Kern. Um ein Maß der Instabilität von Auszahlungen, die nicht im Kern liegen, zu erhalten, schlagen wir eine Erweiterung des starken epsilon-Kerns vor und betrachten 3 Metriken. Wir finden, daß die Liberalisierung die Instabilität des Shapley-Werts erhöht. Wir zeigen, daß die Liberalisierung den Kern komprimiert. Die Auswirkung auf den Nukleolus korrespondiert jedoch nicht immer mit der Verschiebung von Minimal- und Maximalwerten der Spieler im Kern. / To study the impact of the liberalization of EU natural gas markets on the power of market players we develop a disaggregated model of the Eurasian natural gas supply system. We model interdependenices among the players as a cooperative game for which we consider various solutions: the Shapley value, the nucleolus and the core. In the first paper we study regional impact of liberalization of access to transmission networks, incentives for mergers and cartels. In the second paper we study the impact of liberalization on the balance of power between ''local champions'', customers, and outside producers, such as Russian Gazprom. We distinguish between two steps of the reform: 1. opening access to transit pipes and 2. opening access to distribution systems, hence customers. Using the Shapley value, we find a modest and rather heterogeneous impact from the first step. The impact of the second step is much larger and yields a clear pattern: all local champions lose, while all customers and all outside producers gain. As one third of the losses of champions within EU leaks to players abroad, current reforms might enhance the dominance of already powerful outside producers. When we apply the nucleolus, in contrast, full liberalization does not benefit outside producers at all. In the third paper we focus on the relation of the Shapley value and the nucleolus to the core. For our model the Shapley value is never in the core. To evaluate the degree of instability of a payoff allocation which is not in the core, we propose an extension of the strong epsilon-core and consider three metrics. We find that liberalization increases the degree of instability of the Shapley value for all metrics. We show that liberalization compresses the core, but not always the nucleolus corresponds well to the shifts in the minimal and maximal values of players in the core.

Vocational interest is a dynamic, subjective, positive attraction towards a job, occupa tion or occupational field, based on the individual's perception of the structure of occupations and situations already experienced or expected to produce pleasurable feelings. Interest test tields are usually statistically derived from characteristics of individuals. This study develops and validates an interest test based on the perceived occupationaI structure. After examining various classification models and occupational classification systems, including work by Holland, Gati and Roe, a new network access model was pro­posed, based on many-to-many correspondence in set theory. Categories are arranged on levels. Choice of a category on one level precludes access to another category on the sanK level, but does not restrict access to categories on other levels. It was hypothesised that occupational structure is perceived to consist of the three levels of lields, environments and duties. Each category is a horizontal sirus group and includes all vertical status levels. Career choice is based on preferences at each level. 1200 jobs have been classified by allocation to one category on each level, and each is described by a field, environment and duty. The field-environment-duty (FED) system was operationalised in a ten minute interest test asking testees to choose from each level the three categories that interest them for a job. Extensive use was made of x to the power of 2 and empty sets to the power of two statistics in analysing nominal measurement scores. The FED test was applied to 1280 school-leavers in Gauteng, South Africa. Research supports Gati's division of occupations into "soft" (people-oriented occupations preferred by females), and "hard" (not-people-oriented occupations preferred by males), and introduces a third "neutral" division which is preferred equally by both males and females. Construct and concurrent validity was shown with the I 9Fll, VIQ, SDS and l6PF. In a four to five year longitudinal study the FED was found to predict future studies (80%) and occupation (86%). Research with working adults found that the FED test predicts concurrent job satisfaction, job tenure and self-assessed performance. Inter-rater reliability in assigning jobs to categories is around 80%. Test-retest reliability was significant to the 0,0001 level using the x to the power of 2 goodness of fit test. / Industrial and Organisational Psychology / D.Com. (Industrial Psychology)

Cette thèse aborde de façon systémique l’analyse de la situation des TICs en Afrique Centrale, elle identifie les problématiques liées à l’accès universel et étudie les politiques d’harmonisation des TICs. Cette analyse conduit alors à proposer une cartographie cible intégrée permettant de réduire la fracture numérique. Non seulement les différentes technologies optiques et radio large bande sont mises à contribution mais décrites en vue de relater les notions de base permettant d’appréhender les avantages et inconvénients de chaque technologie. Ceci a permis par la suite de proposer une démarche méthodologique de modélisation de l’indicateur d’accès au service universel couplée à une stratégie d’optimisation révélant, d’une part le gap technologique à combler et d’autre part, prédisant le niveau d’accès technologique à atteindre en fonction des politiques d’investissement du Fonds de Service Universel. Aussi, outre la proposition de cette démarche de modélisation cette thèse apporte une autre contribution en développant un modèle d’architecture réseau basé sur les technologies radio et en proposant une méthodologie consistant à intégrer les différents paramètres impliqués dans le choix des technologies à déployer en vue de l’accès au service universel. De plus, elle se projette dans l’évolution future de la technologie en offrant une ouverture sur les technologies hybrides. / This thesis deals systematically with the analysis of the situation of ICTs in Central Africa, it identifies the problems related to universal access and studies ICTs harmonization policies. This analysis then enables the proposal of an integrated target mapping to reduce the digital divide. Not only the different optical and radio broadband technologies are used but described to relate the basic concepts allowing to apprehend the advantages and disadvantages of each technology. This allowed us to propose a methodological approach to modeling the universal access and service indicator coupled with an optimization strategy revealing, on the one hand, the technological gap to be filled and on the other hand, predicting the access level based on technologies to achieve in accordance with the investment policies of the Universal Service Fund. Besides the proposal of this modeling approach, other contributions of this thesis is developing a network model architecture based on radio technologies and proposing a methodology consisting of integrating the various parameters involved in the choice of technologies to be deployed for access and universal service. In addition, it is projected into the future evolution of solutions that leads to hybrid technologies.

The thesis sums up the traffic parameters for the evaluation of next-generation access networks. There are mentioned parameters for service quality management and parameters for measuring the quality of experience. The EU regulation on High Speed Internet in the Czech Republic is analyzed. The practical part compares the results between the implementation of the quality management of services and without implementation. Also there is comparing theoretical and practical transmission rates of physical ports. Part of the thesis is a questionnaire focused on the quality of experience of the video sequence.

The thesis deals with the question about necessary conditions to achieve the objective of a high level of consumer protection in the context of the ongoing internal electricity market taking into account the grid-bound electricity supply, which is characterized by the natural monopoly of regulated networks as well as by competition for the homogeneous product electricity. It evaluates the relationship between effective competition and energy sector-specific consumer protection taking into account the energy-specific regulatory law and examines in detail the regulations of the Directive 2009/72/EC concerning consumer protection under the perspective of enabling the responsible and informed consumer to operate as a self-determined market participant and so shape the market actively towards its completion. After art. 114 TFEU as the existing central norm concerning the alignment of the internal energy market is distinguished from other possible competence rules like the new energy sector-specific competence title of art. 194 TFEU the requirements developed by the ECJ case law concerning art. 114 TFEU from the point of view of the energy sector-specific consumer protection are presented. The thesis clarifies both to what extent in Directive 2009/72/EC codified consumer rights are suitable to achieve...