Texte remanié de: Diss.--Theologische Fakultät--Berlin--Humboldt-Universität, 2002. / Bibliogr. p. 609-691. Index.

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In this dissertation, we present performance prediction models for rate-based and window¡Vbased flow control mechanisms. For rate-based flow control, such as in ATM network, we derive two analytical models to predict the ACR rates for congestion-free and congestion networks, respectively. To coordinate the cooperative problems of TCP over ATM networks, we propose a new algorithm to monitor the states of ATM switches and adjust TCP congestion window size based on RM cells. For window-based flow control mechanisms, such as in TCP-Reno and TCP-SACK, we respectively present analytical models to systematically capture the characteristics of multiple consecutive packet losses in TCP windows. Through fast retransmission, the lost packets may or may not be recovered. Thus, we present upper bound analyses for slow start and congestion avoidance phases to study the effects of multiple packet losses on TCP performance. Above the proposed upper bounds, the lost packets may not be successfully recovered through fast retransmission. Finally, we develop a model to study the TCP performance in terms of throughput degradation resulted from multiple consecutive packet losses. The analytical results from the throughput degradation model are validated through OPNET simulation.

Thesis--Basel, 1927. / Vita. Includes bibliographical references (p. [vi]-vii).

Thesis (M.Sc. (Horticulture)) --University of Limpopo, 2022 / Worldwide, water scarcity, land degradation and unavailability of agricultural lands have posed serious threats on food security and income generation. Hunger, micronutrient deficiencies and starvation are likely to go up in Africa due to increasing urbanisation and rise in global food prices. As a result, it is important to identify innovative vegetable growing-based strategies, which can increase access to food by utilising the limited space available in rural and urban areas. Therefore, sack gardening technology could be a solution to both the lack of arable land and water scarcity in urban and rural areas. The objective of the study was to determine whether axillary bud number will have an effect on agronomic parameters and yield of sweet potato cv. 'Blesbok' produced using the sack gardening technology. Treatments, namely, 1, 2, 3, 4, and 5 number of axillary buds per stem cutting, were arranged in randomised complete block design, with 10 replicates. One bud (1) was used as a control. Different stem cuttings measuring from 10 to 30 cm long with approximately one (1) to six (6) axillary buds were collected from mature sweet potato plantation at a certified nursery from cv. 'Blesbok'. A total of eight (8) stem cuttings were planted in sacks consisting of growing media mixture of steam pasteurised loam soil and compost (3:1 v/v), 4 on top side of the sack and the remaining four on the side-holes of the sack. Insect pests were scouted and monitored weekly, while diseases were managed using spraying programmes as in commercial sweet potato production systems. Two weeks after transplanting, each plant was fertilised with 5 g nitrogen (N), phosphorus (P), and potassium (K) 2:3:2 (26) + 0.5% Zinc (Zn) + 5% sulphur (S) and 5% calcium (Ca). Number of axillary buds had significant effects on vine length, fresh shoot mass, number of shoots and dry shoot mass contributing 59%, 58%, 45% and 58% in total treatment variation (TTV), respectively, whereas axillary bud numbers had no significant effects on fresh tuberous root mass, chlorophyll content, vine stem diameter, tuberous root diameter, tuberous root length, dry tuberous root mass and number of tuberous roots. Relative to control (one bud), two (2), three (3), four (4), five (5) number of axillary buds decreased vine length, fresh shoot mass and dry shoot mass by 8-37, 30-55 and 26-55%, respectively. However, relative to control (one bud), number of axillary buds increased number of shoots by 8-17%. The quadratic relationship models were explained by 95, 92, 96 and 98% of vine length (VL), number of shoots (NS), fresh shoot mass (FSM) and dry shoot mass (DSM), respectively. In conclusion, findings of the study demonstrated that a single (1) or two (2) axillary bud(s) on stem cuttings of sweet potato CV. „Blesbok‟ showed better results for both yield and growth parameters as compared to three (3), four (4) and five (5) buds. / AgriSETA

Cette thèse a comme objectif de démontrer combien Alaric et ses Goths étaient Romains dans pratiquement toutes les catégories connues sur leur compte. Pour ce faire, l’auteur a puisé dans les sciences sociales et a emprunté le champ conceptuel de l’éminent sociologue Pierre Bourdieu. À l’aide du concept d’habitus, entre autres choses, l’auteur a tenté de faire valoir à quel point les actions d’Alaric s’apparentaient à celles des généraux romains de son époque. Naturellement, il a fallu étaler le raisonnement au long de plusieurs chapitres et sur de nombreux niveaux. C’est-à-dire qu’il a fallu d’abord définir les concepts populaires en ce moment pour « faire » l’histoire des barbares durant l’Antiquité tardive. Pensons ici à des termes tels que l’ethnicité et l’ethnogenèse. L’auteur s’est distancé de ces concepts qu’il croyait mal adaptés à la réalité des Goths et d’Alaric. C’est qu’il fallait comprendre ces hommes dans une structure romaine, au lieu de leur octroyer une histoire et des traditions barbares. Il a ensuite fallu montrer que la thèse explorait des avenues restées peu empruntées jusqu’à aujourd’hui. Il a été question de remonter jusqu’à Gibbon pour ensuite promouvoir le fait que quelques érudits avaient autrefois effleuré la question d’Alaric comme étant un homme beaucoup moins barbare que ce que la tradition véhiculait à son sujet, tel que Fustel de Coulanges, Amédée Thierry ou encore Marcel Brion. Il s’agissait donc de valider l’angle de recherche en prenant appui d’abord sur ces anciens luminaires de la discipline. Vint ensuite l’apport majeur de cette thèse, c’est-à-dire essentiellement les sections B, C et D. La section B a analysé la logistique durant la carrière d’Alaric. Cette section a permis avant tout de démontrer clairement qu’on n’a pas affaire à une troupe de brigands révoltés; le voyage de 401-402 en Italie prouve à lui seul ce fait. L’analyse approfondie de l’itinéraire d’Alaric durant ses nombreux voyages a démontré que cette armée n’aurait pas pu effectuer tous ces déplacements sans l’appui de la cour orientale. En l’occurrence, Alaric et son armée étaient véritablement des soldats romains à ce moment précis, et non pas simplement les fédérés barbares de la tradition. La section C s’est concentrée sur les Goths d’Alaric, où on peut trouver deux chapitres qui analysent deux sujets distincts : origine/migration et comparaison. C’est dans cette section que l’auteur tente de valider l’hypothèse que les Goths d’Alaric n’étaient pas vraiment Goths, d’abord, et qu’ils étaient plutôt Romains, ensuite. Le chapitre sur la migration n’a comme but que de faire tomber les nombreuses présomptions sur la tradition gothe que des érudits comme Wolfram et Heather s’efforcent de défendre encore aujourd’hui. L’auteur argumente pour voir les Goths d’Alaric comme un groupe formé à partir d’éléments romains; qu’ils eurent été d’une origine barbare quelconque dans les faits n’a aucun impact sur le résultat final : ces hommes avaient vécu dans l’Empire durant toute leur vie (Alaric inclus) et leurs habitus ne pouvaient pas être autre chose que romain. Le dernier chapitre de la section C a aussi démontré que le groupe d’Alaric était d’abord profondément différent des Goths de 376-382, puis d’autres groupes que l’on dit barbares au tournant du 5e siècle, comme l’étaient les Vandales et les Alamans par exemple. Ensemble, ces trois chapitres couvrent la totalité de ce que l’on connait du groupe d’Alaric et en offre une nouvelle interprétation à la lumière des dernières tendances sociologiques. La section D analyse quant à elle en profondeur Alaric et sa place dans l’Empire romain. L’auteur a avant tout lancé l’idée, en s’appuyant sur les sources, qu’Alaric n’était pas un Goth ni un roi. Il a ensuite analysé le rôle d’Alaric dans la structure du pouvoir de l’Empire et en est venu à la conclusion qu’il était l’un des plus importants personnages de l’Empire d’Orient entre 397 et 408, tout en étant soumis irrémédiablement à cette structure. Sa carrière militaire était des plus normale et s’inscrivait dans l’habitus militaire romain de l’époque. Il a d’ailleurs montré que, par ses actions, Alaric était tout aussi Romain qu’un Stilicon. À dire le vrai, mis à part Claudien, rien ne pourrait nous indiquer qu’Alaric était un barbare et qu’il essayait d’anéantir l’Empire. La mauvaise image d’Alaric n’est en effet redevable qu’à Claudien : aucun auteur contemporain n’en a dressé un portrait aussi sombre. En découle que les auteurs subséquents qui firent d’Alaric le roi des Goths et le ravageur de la Grèce avaient sans doute été fortement influencés eux aussi par les textes de Claudien. / This thesis hopes to demonstrate how Alaric and his Goths were Romans in virtually all that is known about them. To do this, the author has drawn from the social sciences to take the conceptual scope of the eminent sociologist Pierre Bourdieu. Using the concept of habitus, among other things, the author has tried to argue how Alaric’s ‘habits’ were similar to those of the Romans of his time. Naturally, the reasoning was spread over several chapters and on several levels. That is to say, it was first necessary to define the concepts popular at this time to "tell" the History of the Barbarians in Late Antiquity. We have to think here of terms such as ethnicity and ethnogenesis. The author has distanced himself from these concepts he thought ill-suited to the reality of the Goths and of Alaric. We should understand these men in a Roman structure, instead of granting them a History and/or barbaric traditions. He then had to show that the thesis explored avenues which have remained understudied until today. He had to start with Gibbon and work his way up the erudite chart while promoting the fact that some scholars had previously touched on Alaric as a man much less barbaric than the tradition was promoting, such as Fustel de Coulanges, Amédée Thierry and Marcel Brion. It was therefore important to validate the research angle by first acknowledging the place of these great scholars. Then came the major contribution of this thesis, that is to say essentially the sections B, C and D. Section B is focusing on the logistical side of Alaric’s story. This section have foremost allowed to demonstrate clearly that we are not dealing with a band of revolted brigands : the travel of 402 in Italy alone proves this fact. The detailed analysis of the routes taken by Alaric during his many trips demonstrates that the army could not have done all these movements without the support of the eastern court. In that case, Alaric and his army were truly Roman soldiers and not just the barbarous federated people of the tradition. Section C focus on Alaric's Goths where one can find two chapters covering two distinct areas: Origin/Migration and Comparison. It is in this section that the author attempts to support the hypothesis that the Goths of Alaric were not really Goths but rather Romans. The chapter on migration had the goal to break down many assumptions about this gothic tradition that scholars like Wolfram and Heather are still trying to defend. The author argues to see Alaric's Goths as a group formed from Roman elements; to know if in fact any of them was of barbarian stock is irrelevant to the end result : these men had lived in the Empire throughout their entire lives (Alaric included) and their habitus could not have been anything other than Roman. The last chapter of Section C showed without any doubt that the group of Alaric was firstly deeply different from the Goths of 376-382, but then also from other groups that are said to have been barbarians at the turn of the fifth century, as were the Vandals and Alamanni for example. Together, these three chapters cover the totality of what is known about the group of Alaric and offers fresh interpretation following the last trends in social sciences. The section D is for its part an in-depth analysis of Alaric and his place in the Roman Empire. The author has demonstrated above all, relying on sources, that Alaric was not a Goth nor a king. He then analyzed the role of Alaric in the power structure of the Empire and came to the conclusion that he was one of the most important men of the Eastern Empire between 397 and 408, while still being totally dependant on that structure. His whole military career up to 397 was unassuming and was part of the Roman military habitus of the time. He also showed that by his actions, Alaric was also as Roman as Stilicho. To tell the truth, apart from Claudian, nothing could tell us that Alaric was a barbarian and was trying to destroy the Empire. The bad image of Alaric is liable only to Claudian alone : no contemporary writer did draw such a dark portrait of him. It follows that subsequent authors who made Alaric the king of the Goths and the destructor of Greece must had followed Claudian as well.

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As the Second World War in Europe came to an end the Russians advanced from the east towards Berlin. German occupation of Poland and Czechoslovakia had been particularly brutal. Both of these countries, products of German defeat at the end of World War I contained millions of ethnic Germans, who had previously co-existed with their Slav neighbours, often for many centuries, but were now perceived by these neighbours as having encouraged and collaborated with Nazi Germany. Russians, Poles and Czechs now sought revenge triggering the largest forced expulsion in recorded history. Somewhere between 8 and 16.5 million ethnic Germans fled to the west, and between 2 and 3 million perished during flight. Expellee property was subsequently seized by the Poles and Czechs. In broad terms, until the 1990s these events were seen within Germany as part of a submerged collective memory, suppressed in part by their having lost the war. In the last 20 years with an increasingly powerful expellee organisation (the Bund der Vertriebenen, Federation of Expellees) influencing mainstream German politics, academia, and the German media, an attempt has been made to change historical memory, or rewrite what has been referred to as an 'unacceptable past'. This, in recent years has led to claims by former expellees against the Czech Republic, and Poland for restitution. This in itself has led to bitter accusations by these countries that the expellees have rewritten German history portraying themselves as victims of the Second World War. This thesis explores the methods employed by the expellee groups and their supporters in the restructuring of their historical memory by examining literature dating from the 1950s until the present day from primarily German and American sources, as well as German television documentaries from 2000. These sources are considered in relation to how collective and historical memory have evolved into a position that has allowed the expellees to create an 'acceptable past'.