Armed Conflict and Contested Memory: A Plea for a Fresh Start in the Politics of Memory in Mozambique

In 2012, twenty years after the conclusion of the peace treaty, the armed conflict between the former civil war parties broke out again in Mozambique. In addition to political and economic imbalances, the root causes seem to lie in deep-seated conflicts over memory cultures between the respective supporters of the two civil war parties. In his report, [the author] shows how a lack of reckoning with the past from the perspective of the politcs of memory prevents successful, inclusive nation-building. He explains which instruments could be used to further process and negotiate the different strands of memory in order to initiate a lasting pacification of Mozambique

National Integration in Guinea-Bissau since Independence

This article explores national integration in Guinea-Bissau since independence in 1974. I argue that the level of national integration is quite strong – despite the ethnic diversity prevalent in the country. As I will show, national integration is due to the ideology and policy of the former independence movement and the early postcolonial state that advocated a national-unity-in-ethnic-diversity-model. Bissau-Guineans know to separate between the state and the nation, a distinction sometimes neglected in analyses. As my findings suggest, Bissau-Guineans victimize their nation while confronting it with the state. A foreign invasion during the 1998-99 Military Conflict fostered national integration even more.O artigo explora a integração nacional na Guiné-Bissau desde a independência do país em 1974. O nível de integração nacional é – no meu modo de ver – relativamente forte, apesar da diversidade étnica naquele país da África Ocidental. Como vou demonstrar, a integração nacional baseia-se na ideologia e política do antigo movimento independentista e no jovem Estado pós-colonial, que advogavam um modelo de unidade-nacional-na-diversidade-étnica. Os guineenses sabem diferenciar entre o Estado e a nação, uma distinção às vezes negligenciada nas análises. Como sugerem os resultados da minha pesquisa de campo, os guineenses vitimizam a sua nação enquanto confrontam a nação com o Estado. Uma invasão estrangeira durante o conflito militar de 1998-99 reforçou ainda mais a integração nacional

National Integration in Guinea-Bissau since Independence

This article explores national integration in Guinea-Bissau since independence in 1974. I argue that the level of national integration is quite strong – despite the ethnic diversity prevalent in the country. As I will show, national integration is due to the ideology and policy of the former independence movement and the early postcolonial state that advocated a national-unity-in-ethnic-diversity-model. Bissau-Guineans know to separate between the state and the nation, a distinction sometimes neglected in analyses. As my findings suggest, Bissau-Guineans victimize their nation while confronting it with the state. A foreign invasion during the 1998-99 Military Conflict fostered national integration even more.O artigo explora a integração nacional na Guiné-Bissau desde a independência do país em 1974. O nível de integração nacional é – no meu modo de ver – relativamente forte, apesar da diversidade étnica naquele país da África Ocidental. Como vou demonstrar, a integração nacional baseia-se na ideologia e política do antigo movimento independentista e no jovem Estado pós-colonial, que advogavam um modelo de unidade-nacional-nadiversidade- étnica. Os guineenses sabem diferenciar entre o Estado e a nação, uma distinção às vezes negligenciada nas análises. Como sugerem os resultados da minha pesquisa de campo, os guineenses vitimizam a sua nação enquanto confrontam a nação com o Estado. Uma invasão estrangeira durante o conflito militar de 1998-99 reforçou ainda mais a integração nacional

Setting the model: reforming policing in Guinea-Bissau

"For the past decade, international donors have made efforts to reform the security sector in Guinea-Bissau - yet success has been elusive. Why have international reform concepts largely failed? By exploring reform attempts in the police sector, the author investigates the causes which led up to this situation. He identifies a number of problems concerning among others the communication or the course of action between the International Community and Bissau-Guinean institutions and gives advice on how to improve the solutions to security sector related issues." (author's abstract

Efficient Acquisition and Denoising of Full-Range Event-Related Potentials Following Transient Stimulation of the Auditory Pathway

This body of work relates to recent advances in the field of human auditory event-related potentials (ERP), specifically the fast, deconvolution-based ERP acquisition as well as single-response based preprocessing, denoising and subsequent analysis methods. Its goal is the contribution of a cohesive set of methods facilitating the fast, reliable acquisition of the whole electrophysiological response generated by the auditory pathway from the brainstem to the cortex following transient acoustical stimulation. The present manuscript is divided into three sequential areas of investigation : First, the general feasibility of simultaneously acquiring auditory brainstem, middle-latency and late ERP single responses is demonstrated using recordings from 15 normal hearing subjects. Favourable acquisition parameters (i.e., sampling rate, bandpass filter settings and interstimulus intervals) are established, followed by signal analysis of the resulting ERP in terms of their dominant intrinsic scales to determine the properties of an optimal signal representation with maximally reduced sample count by means of nonlinear resampling on a logarithmic timebase. This way, a compression ratio of 16.59 is achieved. Time-scale analysis of the linear-time and logarithmic-time ERP single responses is employed to demonstrate that no important information is lost during compressive resampling, which is additionally supported by a comparative evaluation of the resulting average waveforms - here, all prominent waves remain visible, with their characteristic latencies and amplitudes remaining essentially unaffected by the resampling process. The linear-time and resampled logarithmic-time signal representations are comparatively investigated regarding their susceptibility to the types of physiological and technical noise frequently contaminating ERP recordings. While in principle there already exists a plethora of well-investigated approaches towards the denoising of ERP single-response representations to improve signal quality and/or reduce necessary aquisition times, the substantially altered noise characteristics of the obtained, resampled logarithmic-time single response representations as opposed to their linear-time equivalent necessitates a reevaluation of the available methods on this type of data. Additionally, two novel, efficient denoising algorithms based on transform coefficient manipulation in the sinogram domain and on an analytic, discrete wavelet filterbank are proposed and subjected to a comparative performance evaluation together with two established denoising methods. To facilitate a thorough comparison, the real-world ERP dataset obtained in the first part of this work is employed alongside synthetic data generated using a phenomenological ERP model evaluated at different signal-to-noise ratios (SNR), with individual gains in multiple outcome metrics being used to objectively assess algorithm performances. Results suggest the proposed denoising algorithms to substantially outperform the state-of-the-art methods in terms of the employed outcome metrics as well as their respective processing times. Furthermore, an efficient stimulus sequence optimization method for use with deconvolution-based ERP acquisition methods is introduced, which achieves consistent noise attenuation within a broad designated frequency range. A novel stimulus presentation paradigm for the fast, interleaved acquisition of auditory brainstem, middle-latency and late responses featuring alternating periods of optimized, high-rate deconvolution sequences and subsequent low-rate stimulation is proposed and investigated in 20 normal hearing subjects. Deconvolved sequence responses containing early and middle-latency ERP components are fused with subsequent late responses using a time-frequency resolved weighted averaging method based on cross-trial regularity, yielding a uniform SNR of the full-range auditory ERP across investigated timescales. Obtained average ERP waveforms exhibit morphologies consistent with both literature values and the reference recordings obtained in the first part of this manuscript, with all prominent waves being visible in the grand average waveforms. The novel stimulation approach cuts acquisition time by a factor of 3.4 while at the same time yielding a substantial gain in the SNR of obtained ERP data. Results suggest the proposed interleaved stimulus presentation and associated postprocessing methodology to be suitable for the fast, reliable extraction of full-range neural correlates of auditory processing in future studies.Diese Arbeit steht im Zusammenhang mit aktuellen Entwicklungen auf dem Gebiet der ereigniskorrelierten Potentiale (EKP) des humanen auditorischen Systems, insbesondere der schnellen, entfaltungsbasierten EKP-Aufzeichnung sowie einzelantwortbasierten Vorverarbeitungs-, Entrauschungs- und nachgelagerten Analysemethoden. Ziel ist die Bereitstellung eines vollständigen Methodensatzes, der eine schnelle, zuverlässige Erfassung der gesamten elektrophysiologischen Aktivität entlang der Hörbahn vom Hirnstamm bis zum Cortex ermöglicht, die als Folge transienter akustischer Stimulation auftritt. Das vorliegende Manuskript gliedert sich in drei aufeinander aufbauende Untersuchungsbereiche : Zunächst wird die generelle Machbarkeit der gleichzeitigen Aufzeichnung von Einzelantworten der auditorischen Hirnstammpotentiale zusammen mit mittelspäten und späten EKP anhand von Referenzmessungen an 15 normalhörenden Probanden demonstriert. Es werden hierzu geeignete Erfassungsparameter (Abtastrate, Bandpassfiltereinstellungen und Interstimulusintervalle) ermittelt, gefolgt von einer Signalanalyse der resultierenden EKP im Hinblick auf deren dominante intrinsische Skalen, um auf dieser Grundlage die Eigenschaften einer optimalen Signaldarstellung mit maximal reduzierter Anzahl an Abtastpunkten zu bestimmen, die durch nichtlineare Neuabtastung auf eine logarithmische Zeitbasis realisiert wird. Hierbei wird ein Kompressionsverhältnis von 16.59 erzielt. Zeit-Skalen-Analysen der uniform und logarithmisch abgetasteten EKP-Einzelantworten zeigen, dass bei der kompressiven Neuabtastung keine relevante Information verloren geht, was durch eine vergleichende Auswertung der resultierenden, gemittelten Wellenformen zusätzlich gestützt wird - alle prominenten Wellen bleiben sichtbar und sind hinsichtlich ihrer charakteristischen Latenzen und Amplituden von der Neuabtastung weitgehend unbeeinflusst. Die uniforme und logarithmische Signalrepräsentation werden hinsichtlich ihrer Anfälligkeit für die üblicherweise bei der EKP-Aufzeichnung auftretenden physiologischen und technischen Störquellen vergleichend untersucht. Obwohl bereits eine Fülle von gut etablierten Ansätzen für die Entrauschung von EKP-Einzelantwortdarstellungen zur Verbesserung der Signalqualität und/oder zur Reduktion der benötigten Erfassungszeiten existiert, erfordern die wesentlich veränderten Störeigenschaften der vorliegenden, logarithmisch abgetasteten Einzelantwortdarstellungen im Gegensatz zu ihrem uniformen Äquivalent eine Neubewertung der verfügbaren Methoden für diese Art von Daten. Darüber hinaus werden zwei neuartige, effiziente Entrauschungsalgorithmen geboten, die auf der Koeffizientenmanipulation einer Sinogramm-Repräsentation bzw. einer analytischen, diskreten Wavelet-Zerlegung der Einzelantworten basieren und gemeinsam mit zwei etablierten Entrauschungsmethoden einer vergleichenden Leistungsbewertung unterzogen werden. Um einen umfassenden Vergleich zu ermöglichen, werden der im ersten Teil dieser Arbeit erhaltene EKP-Messdatensatz sowie synthetischen Daten eingesetzt, die mithilfe eines phänomenologischen EKP-Modells bei verschiedenen Signal-Rausch-Abständen (SRA) erzeugt wurden, wobei die individuellen Anstiege in mehreren Zielmetriken zur objektiven Bewertung der Performanz herangezogen werden. Die erhaltenen Ergebnisse deuten darauf hin, dass die vorgeschlagenen Entrauschungsalgorithmen die etablierten Methoden sowohl in den eingesetzten Zielmetriken als auch mit Blick auf die Laufzeiten deutlich übertreffen. Weiterhin wird ein effizientes Reizsequenzoptimierungsverfahren für den Einsatz mit entfaltungsbasierten EKP-Aufzeichnungsmethoden vorgestellt, das eine konsistente Rauschunterdrückung innerhalb eines breiten Frequenzbands erreicht. Ein neuartiges Stimulus-Präsentationsparadigma für die schnelle, verschachtelte Erfassung auditorischer Hirnstammpotentiale, mittlelspäter und später Antworten durch alternierende Darbietung von optimierten, dichter Stimulussequenzen und nachgelagerter, langsamer Einzelstimulation wird eingeführt und in 20 normalhörenden Probanden evaluiert. Entfaltete Sequenzantworten, die frühe und mittlere EKP enthalten, werden mit den nachfolgenden späten Antworten fusioniert, wobei eine Zeit-Frequenz-aufgelöste, gewichtete Mittelung unter Berücksichtigung von Regularität über Einzelantworten hinweg zum Einsatz kommt. Diese erreicht einheitliche SRA der resultierenden EKP-Signale über alle untersuchten Zeitskalen hinweg. Die erhaltenen, gemittelten EKP-Wellenformen weisen Morphologien auf, die sowohl mit einschlägigen Literaturwerten als auch mit den im ersten Teil dieses Manuskripts erhaltenen Referenzaufnahmen konsistent sind, wobei alle markanten Wellen deutlich in den Gesamtmittelwerten sichtbar sind. Das neuartige Stimulationsparadigma verkürzt die Erfassungszeit um den Faktor 3.4 und vergrößert gleichzeitig den erreichten SRA erheblich. Die Ergebnisse deuten darauf hin, dass die vorgeschlagene verschachtelte Stimuluspräsentation und die nachgelagerte EKP-Verarbeitungsmethodik zur schnellen, zuverlässigen Extraktion neuronaler Korrelate der gesamten auditorischen Verarbeitung im Rahmen zukünftiger Studien geeignet sind.Bundesministerium für Bildung und Forschung | Bimodal Fusion - Eine neurotechnologische Optimierungsarchitektur für integrierte bimodale Hörsysteme | 2016-201

The Upper Guinea Coast in Global Perspective

For centuries, Africa’s Upper Guinea Coast region has been the site of regional and global interactions, with societies from different parts of the African continent and beyond engaging in economic trade, cultural exchange, and various forms of conflict. This book provides a wide-ranging look at how such encounters have continued into the present day, identifying the disruptions and continuities in religion, language, economics, and various other social phenomena that have resulted. These accounts show a region that, while still grappling with the legacies of colonialism and the slave trade, is both shaped by and an important actor within ever-denser global networks, exhibiting consistent transformation and creative adaptation

Construindo a nação na África pós-colonial: o exemplo de Guiné-Bissau

Contrary to many other analyses, this article argues that national integration in Guinea-Bissau is high from the bottom-up and not principally the result of State action. The Independence movement advocated a model of “national unity in ethnic diversity.” Nationality-building did not follow, in effect, successful stateconstruction. The 1998-1999 invasion of the country fomented even more national integration.Contrariando muitas análises, esse artigo argumenta que é elevada a integração nacional em Guiné-Bissau a partir dos “de baixo” e não principalmente comoresultado da ação do Estado. O movimento independentista advogou um modelo de “unidade nacional na diversidade étnica”, mas a construção da nacionalidade não foi efetivamente acompanhada por uma edificação estatal bemsucedida. A invasão estrangeira em 1998-1999 fomentou ainda mais a integração nacional

Die Reform des Sicherheitssektors in Guinea-Bissau

"Seit fast 10 Jahren bemühen sich verschiedene Akteure mit teils ambitionierten Programmen und hohen Investitionen um eine Sicherheitssektorreform (SSR) im westafrikanischen Guinea-Bissau. Doch die Situation im Land ist nach wie vor desolat, zum Teil haben die Reformbemühungen die politische Lage noch weiter destabilisiert und aufgeheizt. Polizei, Justiz und Streitkräfte arbeiten weder effektiv noch nach rechtsstaatlichen Kriterien. Der Autor analysiert die Ursachen des Debakels, die oft auch andere SSR-Projekte in Frage stellen." (Autorenreferat