Power-sharing has become a frequent approach to conflict resolution and postconflict reconstruction in deeply divided multi-ethnic states. Although most of the power-sharing arrangements failed within the first years after their establishment, a few contemporary cases are associated with successful power-sharing, namely with the consociational model. This work aims to determine the impact of the power-sharing arrangement on conflict dynamics and vice versa, thus the development of the model in the long term. Designs, aims and theoretical predictions of two power-sharing models, specifically consociational and centripetal models, are elaborated and subsequently compared with the after-civil war development in Lebanon and Burundi from 2005 to 2019. The periods are divided into time units bounded by amendments of the power-sharing arrangements and peace agreements. That enables to observe the development of both conflict dynamics and models. Political and civil society developments, conflicts registered in the UCDP database and political crisis are considered and put into the context of power-sharing arrangements. Based on the results, I claim that conflict dynamics from the last civil war are maintained on elites' level in the long term, while the gap between elites and masses has widened. Also, the...

Despite promising prospects to transition towards a democracy after attaining its independence in 1980, Zimbabwe somehow fell into authoritarian rule and became increasingly undemocratic compared to other countries in southern Africa. Therefore, this thesis seeks to understand why a “most likely” case of democratization in the region failed and instead slipped into authoritarianism between 1980 and 2000. The single case study investigates a set of elite level dynamics, using components of process tracing and case study techniques. The analysis is built upon a theoretical framework focusing on dimensions of power dynamics in terms of Bratton’s power capture, power division and power sharing along with Svolik’s politics of authoritarian rule and the dominant party system. The research indicates that the political party Zanu-Pf, under the leadership of Mugabe, has dominated the political arena since the first democratic elections of 1980. With the help of the party’s majority, the ruling elites captured, divided, shared and controlled power; to serve authoritarian ends that ensured regime survival at the expense of democracy.

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Security sector reform has in the recent past been a critical component of peace agreements in countries emerging from armed conflicts or political crisis. In Kenya, the Commission of Inquiry into the 2007/08 Post-Election Violence (CIPEV) established that Kenya’s security sector, particularly the police, bore the greatest responsibility for the violence. Subsequently, the police emerged as one of the major institutions for reforms. ‘How have security sector reforms, particularly police reforms, in Kenya developed since 2007 and how, and to what extent, have they been shaped by Kenya’s wider political transitions and SSR process during this period?’ The research aimed at investigating how the police reform process in Kenya has developed since 2007, and how the process has been shaped by Kenya’s wider political transitions and security sector reform processes in general. Using mixed methods research, we found that despite some progress, there is wider public perception that the reforms are yet to address reform priorities at the national level and still fall short of expectations of ordinary Kenyans. We argue that political power-sharing after the 2007 post-election violence facilitated police reform, while at the same time frustrated its implementation especially in instances where reform seemed to dis-empower political elites. / Chevening Scholarship for study-grant during first year of study. The government of Kenya fully funded this PhD.

東西冷戰結束後，族群衝突問題躍為國際政治社會最主要的焦點。比利時和台灣的族群衝突，共同點為少數族群為優勢族群，對多數族群進行強勢支配，多數族群在經過一段時間後，為爭取自身權益群起抗爭，少數族群為維護相對優勢地位及利益，對多數族群的抗爭起而反制，於是族群衝突問題加劇。族群衝突的結果，兩敗俱傷，於是乃有走上政治整合之路以解決之。 本文以權力分享途徑、政治體系環境因素、政治社會學的分析法與比較法，比較研究比利時和台灣的族群衝突問題，包括衝突的背景、衝突的事實，以及解決之道。研究結果，比利時的制度化政治整合，雖保障了族群權益，卻也造成族群隔閡的制度化與永久化。台灣未來解決族群衝突問題，有自然融合與政治制度化保障兩條途徑，兩者各有其利弊得失，惟從過去十餘年的發展歷程來看，未來採族群自然融合發展的可能性較高。

This thesis is an inquiry into the challenges to the role of civic organisations in political reform during and after political transitions. The major question this research addresses is: How do institutions and institutional dynamics constrain political reform during a transition? The thesis examines how demands for reform by non-governmental organisations in Lebanon and Libya were not translated into concrete political decisions taken by regimes during a transition period. The thesis suggests that the combination of weak states and power-sharing agreements marginalizes civic organisations, and poses institutional constraints on the likelihood of reform. The thesis is based on contemporary research on events and reform trajectories in Lebanon and Libya, with a focus on the demands and strategies employed by activists during periods of transition. Lebanon between 2005 and 2010 and Libya between 2011 and 2013 underwent critical political events but subsequently did not adopt political reforms despite demands by civic organisations in two main areas: the electoral system in Lebanon and the constitutional process in Libya. A study of these two reform campaigns reveals deeply entrenched historical patterns and elements of continuity that led to path dependent outcomes during transition. By utilising theory and concepts from the perspective of historical institutionalism, the thesis identifies the factors behind path dependent outcomes in Lebanon and Libya. I argue that the transitions in Lebanon and Libya were a result of only ‘partially' critical junctures. The thesis builds on the approach of path dependence by offering insights as to how historically inherited institutional dynamics from the previous regime can cause junctures to be only ‘partially' critical for the broader political order. The main source of data comes from participant observations, interviews and focus groups with two organisations that tried to advance electoral reform and constitutional development.

Alternative energy resources (such as photovoltaics, fuel cells, wind turbines, micro-turbines, and internal combustion engines) and energy storage systems (such as batteries, supercapacitors, and flywheels) are increasingly being connected to the utility grid, creating distributed energy resources which require the implementation of an effective distributed power management strategy. Parallel-connected power converters form a critical component in such a distributed energy resources system. This dissertation addresses small-signal modeling and analysis of parallel-connected power converter systems operating in distributed energy environments. This work focuses on DC-DC and DC-AC power converters. First, this work addresses the small-signal modeling and analysis of parallel-connected power converters in a battery/supercapacitor hybrid energy storage system. The small-signal model considers variations in the current of individual energy storage devices and the DC bus voltage as state variables, variations in the power converter duty cycles as control variables, and variations in the battery and the supercapacitor voltages and the load current as external disturbances. This dissertation proposes several different control strategies and studies the effects of variations in controller and filter parameters on system performance. Simulation studies were carried out using the Virtual Test Bed (VTB) platform under various load conditions to verify the proposed control strategies and their effect on the final states of the energy storage devices. Control strategies for single DC-AC three-phase power converters are also identified and investigated. These include a novel PV (active power and voltage) control with frequency droop control loop, PQ (active power and reactive power) control, voltage control, PQ control with frequency droop control, and PQ control with voltage and frequency droop control. Small-signal models of a three-phase power converter system with these control strategies were developed, and the impact of parameter variations on the stability of a PV controlled converter were studied. Moreover, a small-signal model of parallel-connected three-phase DC-AC power converters with individual DC power supplies and network is proposed. The simulations carried out in stand-alone and grid-connected modes verify the combined control strategies that were developed. In addition, a detailed small-signal mathematical model that can represent the zero-sequence current dynamics in parallel-connected three-phase DC-AC power converters that share a single DC power source is presented. The effects of a variety of factors on the zero-sequence current are investigated, and a control strategy to minimize the zero-sequence current is proposed. Time-domain simulation studies verify the results. Simulations of a parallel-connected DC-AC power converter system with nonlinear load were carried out. The active power filter implemented in this system provides sharing of harmonic load between each power converter, and reduces harmonic distortion at the nonlinear load by harmonic compensation.

This paper investigates the relationship between ethnic conflict, electoral systems, and power sharing in ethnically divided societies. The cases of Guyana, Fiji, Sri Lanka, Lebanon, Mauritius, and Trinidad and Tobago are considered. Electoral systems are denoted based on presidential versus parliamentary system, and on proportional representation versus majoritarian/plurality. The paper concludes that, while electoral systems are important, other factors like the power distribution between ethnic groups, and ensuring a non-zero-sum game may be as important.

Following world trends, the government of Taiwan is paying more attention in recent years to providing a degree of autonomy to the island’s indigenous peoples. As with many policy initiatives, the government is looking abroad for a blueprint, and Canada is the Western country that is often promoted as a viable model to follow. The purpose of this work is to examine the historical and cultural influences of how each nation has treated its indigenous population and, given these variances, identify roadblocks to Taiwan’s successful implementation of a mechanism for deriving aboriginal self-government agreements based on the Canadian example, as well as to propose policy recommendations on what direction relevant legislation should take. / Following world trends, the government of Taiwan is paying more attention in recent years to providing a degree of autonomy to the island’s indigenous peoples. As with many policy initiatives, the government is looking abroad for a blueprint, and Canada is the Western country that is often promoted as a viable model to follow. The purpose of this work is to examine the historical and cultural influences of how each nation has treated its indigenous population and, given these variances, identify roadblocks to Taiwan’s successful implementation of a mechanism for deriving aboriginal self-government agreements based on the Canadian example, as well as to propose policy recommendations on what direction relevant legislation should take.

La faisabilité des applications à piles à combustible (PAC) a été largement démontrée à travers le monde. Les efforts de recherche portent actuellement sur l'amélioration de la durée de vie des PAC et la diminution de leur coût. A ce jour, une PAC ne tolère pas les variations rapides de charges qui entraînent très souvent son vieillissement prématuré. Pour pallier cette faiblesse, une hybridation avec un composant électrochimique de stockage (typiquement des supercondensateurs) est généralement proposée via un ou deux convertisseurs statiques, nécessitant l'implantation d'une gestion énergétique. Une partie de ces travaux se situe dans le contexte aéronautique et fait suite au projet européen CELINA piloté par AIRBUS. Le projet européen CELINA (2005-2008) a posé la problématique du remplacement de l'éolienne (RAT) actuelle par une pile à combustible pour le réseau électrique de dernier secours sollicité en cas de perte totale des moteurs ou de la génération électrique. Il alimente les charges essentielles : auxiliaires de puissances presque constantes (calculateurs de bord, …) et les actionneurs de vol (EHA, EMA) qui constituent les principaux consommateurs à caractères très intermittents. Cette étude a permis une classification de trois architectures, dont la validation expérimentale se situant dans le cadre du projet français ISS ayant débuté en 2010 sera exposée. L'hybridation directe entre une PAC et des supercondensateurs présente les avantages de ne pas mettre en jeu de convertisseur statique et d'une autogestion énergétique naturelle. Partant du constat que toutes les applications embarquées utilisant des PAC sont hybridées et qu'un développement d'architecture et de stratégies est effectué pour chaque cas (mise au point de convertisseurs, lois de commande, etc.). Ceci représente un travail considérable et systématique, ce qui freine l'implantation des systèmes PAC dans les applications embarquées. L'objectif est alors d'étudier la faisabilité d'un composant hybride unique jouant le rôle de source de puissance et d'énergie dont la gestion énergétique est transparente pour l'utilisateur et ne nécessitant pas l'ajout d'une hybridation supplémentaire pour ces applications. Cette thématique fait l'objet de ces travaux de thèse en collaboration avec la société française HELION Hydrogen Power. Après une présentation de l'introduction des systèmes PAC en aéronautique centrée autour de l'hybridation directe, la suite des travaux regroupe deux grandes thématiques : la première concerne l'étude des interactions entre PAC et supercondensateurs lors d'une association directe selon trois approches : théorique, expérimentale et par simulation. La seconde concerne la validation expérimentale de trois architectures d'hybridation d'un système PAC retenues pour un contexte aéronautique lors d'études précédentes au laboratoire : une architecture indirecte pour laquelle le stockage possède son convertisseur, une architecture indirecte avec stockage sur le bus DC et une architecture directe. L'objectif de ces travaux étant d'augmenter le niveau de maturité technologique de ces concepts, ainsi que de comparer les différents moyens retenus pour parvenir à l'hybridation d'un système PAC suivant des critères précis. / The feasibility of fuel cell (FC) applications has been demonstrated throughout the world. Research efforts are currently focused on improving the lifetime of the FC and reducing their cost. Until today, a FC does not tolerate rapid variations of load that cause in most cases lifetime reducing. To reduce this defect, hybridization with electrochemical storage component (typically ultracapacitors) is generally suggested via one or two static converters, requiring the implementation of an energy management. Aeronautic applications constitute the framework of these studies. They are the prolongation of studies initiated within the European project CELINA piloted by AIRBUS. The CELINA project (2005-2008) dealt with the replacement of the Ram Air Turbine (RAT) which is currently used for the last emergency electrical network in the case of total losses of engines or electrical generation. This emergency network has to supply the essential loads: the piloting auxiliaries (calculators…) consume a quasi-constant power, and the flight actuators (EHA, EMA) which are the main loads whose consumption is very intermittent. This study resulted in a classification of three architectures for which experimental validation in the framework of the French ISS project started since 2010 will be exposed. The direct hybridization between a FC and ultracapacitors has the advantages of not involving static converter and provide a natural energy management. The statement of facts is that all embedded applications using FC are hybridized, architecture and strategies development is performed for each case (development of converters, control laws, etc.). This represents a significant and systematic work, which limits the implementation of FC in embedded applications. In this work, the objective is to study the feasibility of a single hybrid component acting as a power and energy source for which energy management is transparent to the user and does not require the addition of another hybridization. This work is part of collaboration with the French company HELION Hydrogen Power. After a presentation of the insertion of FC in aeronautics centered on the direct hybridization, two major themes are approached: The first concerns the study of interactions between FC and ultracapacitors in a direct association according to three approaches: theoretical, experimental and simulation. The second concerns the experimental validation of three hybridization architectures for FC considered in previous studies in the laboratory: an architecture for which the indirect storage has its converter, an architecture with indirect storage on the DC bus and a direct hybridization architecture. The objective of this work is to increase the level of technological Readiness level of these concepts, and to compare the different ways considered to achieve the hybridization of a fuel cell system according to specific standards.