Ce travail est consacré à l’étude de l’incorporation volontaire des dopants dans des films de carbure de silicium épitaxiés par la technique de dépôt chimique en phase vapeur. Le rôle des principaux paramètres de croissance (température, flux de dopant, vitesse de dépôt, pression dans le réacteur et le rapport C/Si) sur l’incorporation d’azote et d’aluminium a été étudié en détail. Les travaux menés jusqu’ici ont largement exploré les caractéristiques de l’incorporation de dopants, en particulier l’incorporation d’azote et ont montré des résultats parfois très dépendants de l’équipement de croissance utilisé. Afin d’explorer cette influence, une étude expérimentale exhaustive sur l’incorporation de N et Al a été réalisée sur des couches homoépitaxiées 4H-SiC sur la face carbone et sur la face silicium de substrats 4H-SiC dans nos réacteurs CVD. Cette étude a été complétée par une analyse des propriétés structurales, optiques et électriques de couches 4H-SiC dopé Al. Aussi, la fabrication de diodes pn a été expérimentée sur les couches épitaxiées dans nos réacteurs. Nous avons pu observer différentes tendances expérimentales selon la nature du dopant, l’orientation cristalline du substrat et l’environnement chimique durant la croissance. Nous en déduisons que le mécanisme derrière les tendances observées est largement influencé par des facteurs comme les conditions de croissance (c'est-à-dire la température de croissance et/ou la pression) et la couverture de carbone à la surface de la croissance, surtout sur la face C / This work is dedicated to the investigation of intentional dopant incorporation in silicon carbide epilayers grown by chemical vapor deposition technique. The role of main process conditions (growth temperature, dopant supply, deposition rate, growth pressure and C/Si ratio) on both, Nitrogen and Aluminum incorporation was studied in details. Previous works have widely explored the characteristics of dopant incorporation, especially the nitrogen incorporation addressing a potential influence of growth equipment for the observed incorporation trends. An exhaustive experimental study of N and Al incorporation was performed for homoepitaxial 4H-SiC layers grown on Si- and C-faces of 4H-SiC substrates in our CVD setups to explore such influence. It was completed by the assessment of the structural, optical and electrical properties of the Al doped 4H-SiC films. Furthermore, the fabrication of pn diodes was tested on the grown layers. We have observed different experimental tendencies depending on dopant nature, crystal orientation and chemical environment. We conclude from these observations that the mechanism behind the experimentally obtained tendencies is widely influenced by factors such as process conditions (i.e. growth temperature and/or pressure) and the carbon coverage at the grown surface, especially on C-face

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In this dissertation, I critically evaluate the VAT treatment of common partnership transactions that are encountered during the life of a partnership. Of great significance, is that at common law a partnership is not regarded as a person, but for VAT purposes it is treated as a separate person. This creates a strong dichotomy between the general legal nature, and the VAT character of a partnership transaction. The partnership and the VAT law dichotomy, is an important theme that runs through most of the thesis. Only once I have established the nature of the transaction for VAT purposes – whether in keeping with or differing from the common law – do I apply the relevant provisions of the VAT Act to determine the VAT implications of the transaction. An important general principle is that what is supplied or acquired by the body of persons who make up the partnership, within the course and scope of its common purpose, is for VAT purposes, supplied or acquired by the partnership as a separate person. I conclude that there are difficulties and uncertainties regarding the application of the provisions of the VAT Act to various partnership transactions. For the sake of certainty and simplicity, I propose amendments to the current provisions that are relevant to partnership transactions, and also propose additional provisions. The proposed amendments seek to align with the purpose of the VAT Act and the principles upon which it is based, and also to adhere to internationally accepted principles for a sound VAT system. I also pinpoint those aspects of the VAT Act that can be clarified by the SARS in an interpretation statement. I further identify issues that require more research, eg issues arising from a partnership’s participation in cross-border trade. / Mercantile Law / LL. D.

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The dissertation is focused on changes in an attitude and initiative students at secondary special school with gastronomy orientation to study special subjects after realization a creative project: "Welcome Day - Day of Open Door - Halloween." The target group are students of Secondary School and College for Tourist Industry in České Budějovice. The dissertation is divided into fifth chapters. I the first two chapters different opinions of experts in teaching methods, classical and alternative methods of education and teaching, teachers competence and authority participation, experimental education are compared. The thirds chapter contains proposals for topics of project learning in schools with gastronomy orientation. There is an enumeration of folk traditions and their connection with the culture and gastronomy. The fourth chapter describes the project realization in Secondary School and College for Tourist Industry in České Budějovice. The fifth chapter contains the research targets, the research methods and interpretation of research results. The target of the dissertation is questionnaire comparison of students' attitudes after realization the project learning. The research assumptions are that students appreciate extension special subjects of folk traditions and do not reject to participation in the pro?ject realization.

In software development projects, bug triage consists mainly of assigning bug reports to software developers or teams (depending on the project). The partial or total automation of this task would have a positive economic impact on many software projects. This thesis introduces a systematic four-step method to find some of the best configurations of several machine learning algorithms intending to solve the automatic bug assignment problem. These four steps are respectively used to select a combination of pre-processing techniques, a bug report representation, a potential feature selection technique and to tune several classifiers. The aforementioned method has been applied on three software projects: 66 066 bug reports of a proprietary project, 24 450 bug reports of Eclipse JDT and 30 358 bug reports of Mozilla Firefox. 619 configurations have been applied and compared on each of these three projects. In production, using the approach introduced in this work on the bug reports of the proprietary project would have increased the accuracy by up to 16.64 percentage points.

Multiple-Input Multiple-Output (MIMO) communication using multiple antennas has received significant attention in recent years, both in the academia and industry, as they offer additional spatial dimensions for high-rate and reliable communication, without expending valuable bandwidth. However, exploiting these promised benefits of MIMO systems critically depends on fast and accurate acquisition of Channel State Information (CSI) at the Receiver (CSIR) and the Transmitter (CSIT). In Time Division Duplex (TDD) MIMO systems, where the forward channel and the reverse channel are the same, it is possible to exploit this reciprocity to reduce the overhead involved in acquiring CSI, both in terms of training duration and power. Further, many popular and efficient transmission schemes such as beam forming, spatial multiplexing over dominant channel modes, etc. do not require full CSI at the transmitter. In such cases, it is possible to reduce the Reverse Channel Training (RCT) overhead by only learning the part of the channel that is required for data transmission at the transmitter. In this thesis, we propose and analyze several novel channel-dependent RCT schemes for MIMO systems and analyze their performance in terms of (a) the mean-square error in the channel estimate, (b) lower bounds on the capacity, and (c) the diversity-multiplexing gain tradeoff. We show that the proposed training schemes offer significant performance improvement relative to conventional channel-agnostic RCT schemes. The main take-home messages from this thesis are as follows: • Exploiting CSI while designing the RCT sequence improves the performance. • The training sequence should be designed so as to convey only the part of the CSI required for data transmission by the transmitter. • Power-controlled RCT, when feasible, significantly outperforms fixed power RCT.

Indiana University-Purdue University Indianapolis (IUPUI) / Break-induced replication (BIR) is a mechanism to repair double-strand breaks (DSBs) that possess only a single end that can find homology in the genome. This situation can result from the collapse of replication forks or telomere erosion. BIR frequently produces various genetic instabilities including mutations, loss of heterozygosity, deletions, duplications, and template switching that can result in copy-number variations (CNVs). An important type of genomic rearrangement specifically linked to BIR is half crossovers (HCs), which result from fusions between parts of recombining chromosomes. Because HC formation produces a fused molecule as well as a broken chromosome fragment, these events could be highly destabilizing. Here I demonstrate that HC formation results from the interruption of BIR caused by a defective replisome or premature onset of mitosis. Additionally, I document the existence of half crossover instability cascades (HCC) that resemble cycles of non-reciprocal translocations (NRTs) previously described in human tumors. I postulate that HCs represent a potent source of genetic destabilization with significant consequences that mimic those observed in human diseases, including cancer.

Le développement des modes alternatifs de règlement des différends dans les contrats administratifs est une nécessité. En effet, l’encombrement des juridictions administratives, conjugué au besoin d’un règlement des différends plus consensuel et apaisé, plaide en faveur de l’émergence d’une justice alternative. Néanmoins, l’ordre public encadrant l’activité des personnes publiques, et protégé par des normes impératives, impose que le développement des modes alternatifs soit régulé. À ce titre, l’étude du droit positif démontre que ce phénomène n’est pas inconnu dans le règlement des différends intéressant les contrats administratifs. Par exemple, les parties à un différend peuvent déjà librement recourir aux modes amiables (médiation, conciliation ou transaction), et quelques dérogations au principe d’interdiction faite aux personnes publiques de recourir à l’arbitrage sont prévues. Cela étant, les lacunes et les défaillances du régime actuel des modes alternatifs dans les contrats administratifs (absence de véritable statut du médiateur, défaut d’encadrement de la conciliation inter partes, complexité de la notion de concessions réciproques ou, encore, difficulté pour le juge administratif d’asseoir sa compétence en matière d’arbitrage international...) complexifient leur compréhension et leur mise en œuvre et risquent, par suite, d’accroître les violations de l’ordre public. Il est donc nécessaire de proposer un régime pérenne des modes alternatifs permettant d’assurer, d’une part, la protection des normes impératives du droit public et, d’autre part, la liberté des parties dans le choix et la conduite d’une justice alternative. Pour cela, leur futur régime devra autoriser l’arbitrage dans les contrats administratifs et le doter de garanties procédurales prenant en compte sa nature spécifique mais, aussi, certaines caractéristiques inhérentes aux personnes publiques et au droit administratif. De même, les procédures de médiation et de conciliation devront être améliorées afin d’assurer aux parties, un encadrement souple et favorable à la conclusion de transactions équilibrées et sécurisées. Enfin, ce régime devra définitivement consacrer le rôle du juge administratif. À cet effet, ce dernier pourra être amené à assister les parties dans la mise en œuvre des modes alternatifs (création d’un juge administratif d’appui dans l’arbitrage, combinaison des procédures de référé avec les modes amiables...). Le juge administratif devra être aussi chargé du contrôle de conformité de la solution alternative à l’ordre public. Cette attribution de compétence, qui résonne de plus fort en matière d’arbitrage international, est indispensable à la protection de l’intérêt public. Ce n’est qu’à ces conditions, que le développement des modes alternatifs de règlement des différends pourra prendre toute sa place dans les contrats administratifs. / The development of alternative dispute resolution in administrative contracts is a necessity. Indeed, the congestion of the administrative courts, combined with the need for a more consensual and calm settlement of disputes, pleads in favour of the emergence of an alternative justice. Nevertheless, the public order governing the activities of public bodies, and protected by imperative norms, requires that the development of alternative methods be regulated. As such, the study of positive law shows that this phenomenon is not unknown in the settlement of disputes concerning administrative contracts. For instance, the parties to a dispute can already freely resort to amicable methods (mediation, conciliation or settlement agreement), and some exceptions to the principle prohibiting public bodies from resorting to arbitration are provided for. However, the voids and shortcomings of the current system of alternative dispute resolution in administrative contracts (lack of proper status of the mediator, paucity of framework for inter partes conciliation, complexity of the concept of reciprocal concessions or, difficulty for the administrative judge to assert its competence in international arbitration...) make its understanding and implementation more complex and more prone to increasing public order violations. It is therefore necessary to propose a sustainable regime of alternative methods to ensure, on the one hand, the protection of peremptory norms of public law and, on the other hand, the freedom of the parties in the choice and conduct of an alternative justice. For that purpose, the future regime will have to authorize arbitration in administrative contracts and endow it with procedural guarantees taking into account its specific nature but also certain characteristics inherent in public entities and administrative law. Furthermore, the mediation and conciliation procedures will have to be improved in order to provide the parties with a flexible framework conducive to the conclusion of balanced and secure settlement agreements. Finally, this regime must definitively establish the role of the administrative judge. To this end, that judge may be called upon to assist the parties in the implementation of alternative methods (creation of an administrative support judge in arbitration, combination of interim reliefs with amicable procedures...). The administrative judge must also be responsible for checking the compliance of the alternative solution to the public order. This attribution of jurisdiction, which is resonates all the more in international arbitration, is fundamental for the protection of the public interest. It is only under these conditions that the development of alternative dispute resolution mechanisms can take its place in administrative contracts.

Over the past decade, the regulation of mining in South Africa has undergone a fundamental transformation in order to promote equitable access to the nation’s mineral and petroleum resources. The Mineral and Petroleum Resources Development Act 28 of 2002, drastically changed the regulation of mining by placing the nation’s mineral and petroleum resources under the custodianship of the state. The transformative objectives of resource reform, as envisaged in the Constitution of the Republic of South Africa, 1996, could however not be achieved without a measure of sacrifice -- most notably, that which had to be shouldered by the owners of the land in which the minerals are contained. Under common law, minerals vested in the owners of land and no one could compel them to extract or consent to the extraction of these minerals. Landowners were able to safeguard their land from mining activities by refusing to consent to mining. The Mineral and Petroleum Resources Development Act, 2002, changed this by providing that landowners could no longer prevent the state from granting qualifying applicants authorisation to mine. The transformative objectives of resource reform, have inevitably made great inroads into a landowner’s rights to use and enjoy his property optimally. The main focus of this study revolves around the limiting impact of South Africa’s current mineral-law dispensation on township development, and conversely, how township development impairs or limits the mining of coal. For a better understanding of the limitations which the current legislative provisions create in respect of the rights of landowners and holders of mining rights, a brief evaluation of the historical development of the right to mine coal is provided. The entitlements and reciprocal obligations of holders of mining rights and owners of the affected land are considered, and the parties’ legal remedies to resist interference in their respective rights are explored. In the process of considering possible remedies to resolve the conflict which inevitably arises, I explain why English-law principles governing lateral support (support owed by two adjacent properties [neighbour law]), and subjacent support (where the landowner may not be deprived of the vertical support his property derives from the sub-surface minerals) were incorrectly transplanted into our law. In Anglo Operations Ltd v Sandhurst Estates (Pty) Ltd, the South African Supreme Court of Appeal rejected the previously-held view that the right to subjacent support -- like the right to lateral support -- is a natural property right incidental to the ownership of the land. It was further held that conflict between holders of rights to minerals and owners of land should be resolved, not in accordance with English-law principles of neighbour law, but in terms of the law developed for rights relating to the use of servitudes. In summary, the court found that where the parties have not specifically contracted against the specific action (such as opencast or planned-subsidence mining), and provided that it was reasonably necessary for the mining right holder to use this invasive method, he may do so, so long as he does so in the manner least injurious to the entitlements of the surface owner. This decision, however, did not take into account the changes brought about by the comprehensive statutory framework of the Mineral and Petroleum Resources Development Act 28 of 2002 which I argue has replaced the earlier servitude construction. In this dissertation I consider whether possible solutions to resolve the conflict can be found in the principles relating to neighbour law, and whether the principles governing the use of servitudes remain relevant in resolving conflicts between landowners and holders of mining rights. I evaluate possible legal remedies and place special emphasis on the constitutionality of the curtailment of a landowner’s use and enjoyment of his property resulting from mining activities on or under his land. I further consider whether the exercise of a mining right, granted by the state, which results in a serious infringement of a landowner’s ownership, could in certain circumstances amount to a deprivation or possibly an expropriation in terms of section 25 of the Constitution. I discuss the position where the state’s regulatory interference is so severe that it deprives a landowner of the ability to exercise any, or a substantial portion of his ownership entitlements. I evaluate the possibility that such interference may constitute de facto expropriation for which compensation may be claimed. In the penultimate chapter I briefly mention how the relationship between landowners and holders of mining rights is managed and conflict is defused in other jurisdictions such as China, Australia, the United States of America, India, Germany and Swaziland. I conclude this dissertation with suggestions on possible ways in which the conflict may be resolved or at least minimised in future. / Die regulering van mynbou in Suid-Afrika het die afgelope dekade ‘n fundamentele verandering ondergaan ten einde breër toegang tot die nasie se minerale en petroleum hulpbronne te bevorder. Die Mineral and Petroleum Resources Development Act,6 Wet 28 van 2002, het ‘n radikale ommekeer in die mynbou industrie meegebring deurdat die regulering van mynbou aktiwiteite onder die toesig en beheer van die nasionale regering geplaas is. Die transformatiewe oogmerk van hulpbron hervorming ingevolge die Grondwet van die Republiek van Suid-Afrika kon egter nie geskied sonder ‘n mate van opoffering nie. Die grootste aanslag van die nuwe mineraalreg bedeling word sonder twyfel gevoel deur die eienaars van grond ten opsigte waarvan mynregte deur die regering aan ‘n ander party toegeken word. Ingevolge die gemenereg was die eienaar van grond voorheen ook die eienaar van die minerale wat in die grond voorgekom het. Gevolglik was dit onder die uitsluitlike beheer van die eienaar om te bepaal of enigiemand anders die reg kon verkry om minerale op of in die betrokke grond te ontgin. Na aanvang van die inwerkingtreding van die Mineral and Petroleum Resources Development Act is hierdie posisie egter omvêrgewerp aangesien die regering voortaan die bevoegdheid het om te bepaal wie en op watter voorwaardes iemand die reg verkry om minerale te ontgin. Die toekenning van die reg om minerale te ontgin op ‘n ander se eiendom sonder die eienaar se toestemming, maak dus ernstige inbreuk op sy regte. Grondeienaars se bevoegdhede wat uit hul eiendomsreg voortvloei word in talle gevalle ernstig ingeperk ten einde die oogmerke van hulpbron transformasie te bereik. Die ondersoek wat hierna volg, is daarop toegespits om die beperkende aanslag van die regulering van steenkoolmynbou-aktiwiteite op die ontwikkeling van dorpsgebiede asook dié van die ontwikkeling van dorpsgebiedie op steenkoolmynbou beter te verstaan. Ten einde hierdie invloed beter te verstaan, word die geskiedkundige ontwikkeling van die reg om minerale in Suid-Afrika te ontgin kortliks oorweeg. Die regte en verpligtinge van die houers van mynregte en die eienaars van die grond wat deur die uitoefening daarvan geraak word, asook die remedies waaroor die onderskye partye beskik ten einde hul regte teen inbreukmaking deur die ander party te beskerm, word daarna oorweeg. In genoemde ondersoek toon ek aan waarom die Engelsregtelike burereg- beginsels van laterale steun en onderstut nie toepassing in ons reg behoort te vind nie en waarom die botsing wat ontstaan vanweë die uitoefening van die grondeienaar en die houer van ‘n mynreg se regte liefs versoen moet word deur die Suid-Afrikaanse serwituutreg beginsels toe te pas soos aangetoon in die beslissing van Anglo Operations Ltd v Sandhurst Estates. Hiedie beslissing het egter nie die veranderinge wat meegebring is deur die nuwe bedeling van die Mineral and Petroleum Resources Development Act in ag geneem nie en daar word gevolglik aangevoer dat die serwituut beginsels vervang is deur ‘n breedvoerige wetgewende stelsel. Die grondwetlikheid van die beperking op die bevoegdhede van ‘n grondeienaar om sy eiendom te gebruik en te geniet, word ondersoek, asook of daar enige gronde vir ‘n eis om skadevergoeding mag wees. In besonder word daar oorweeg of die leerstuk van konstruktiewe onteiening moontlik toepassing kan vind in gevalle waar die staat se regulering ‘n uitermatige beperkende effek het op die bevoegdhede van ‘n grondeienaar om sy eiendomsreg uit te oefen. In die voorlaaste hoofstuk ontleed ek baie kortliks hoe die verhouding tussen eienaars van grond in mynbougebiede en houers van regte om minerale te ontgin in Sjina, Australië, die Verenigde State van Amerika, Indië, Duitsland en Swaziland gereguleer word. Ter afsluiting word aandag gegee aan moontlike maniere om die belangebotsing tussen die betrokke partye uit die weg te ruim of te beperk. / Private Law / LL.M.