Modelling the Multi in Multi-Party Communication

This thesis investigates the effects of multimedia communications technology on the interaction of mixed- and same-role groups. The first study explores the effect of video and audio conferencing on small, role-differentiated problem-solving groups in the laboratory. The second laboratory study examines the impact of shared video technology on the communication of role-undifferentiated groups. A multi-faceted analytical approach is employed, including indices of task performance, process and content of communication, patterns of interaction and subjective user evaluations. Lastly, a field study looks at how the communication process of business meetings is affected by status constraints and audio conferencing technology. The findings show that both multimedia video and audio communications technology have similar impacts on the patterns of speaker contributions in different types and sizes of groups, and that the extent of their effect is influenced by the presence or absence of role differences between group members - whether experimentally manipulated in the laboratory or organisationally assigned roles in a naturalistic setting. Technology-mediation appears to exaggerate the impact of status and role such that group members say more disparate amounts and interact less freely than in face-to-face groups, in particular it exaggerates the dominance of one individual. Surprisingly, multimedia conferencing technology can support free and equal participation in groups whose speakers have similar roles but evidence of its effect on speakers of similar status is equivocal. The implications for communication outcome and design of communications technology are discussed

Local Coordination for Interpersonal Communication Systems

The decomposition of complex applications into modular units is anacknowledged design principle for creating robust systems and forenabling the flexible re-use of modules in new applicationcontexts. Typically, component frameworks provide mechanisms and rulesfor developing software modules in the scope of a certain programmingparadigm or programming language and a certain computing platform. Forexample, the JavaBeans framework is a component framework for thedevelopment of component-based systems -- in the Java environment.In this thesis, we present a light-weight, platform-independentapproach that views a component-based application as a set of ratherloosely coupled parallel processes that can be distributed on multiplehosts and are coordinated through a protocol. The core of ourframework is the Message Bus (Mbus): an asynchronous, message-orientedcoordination protocol that is based on Internet technologies andprovides group communication between application components.Based on this framework, we have developed a local coordinationarchitecture for decomposed multimedia conferencing applications thatis designed for endpoint and gateway applications. One element of thisarchitecture is an Mbus-based protocol for the coordination of callcontrol components in conferencing applications

Decolonising Public Relations in Africa: Centring Local Epistemes in Ghanaian Political Communication

At independence, African countries were faced with the task of decolonising. Countries were renamed as part of a broader Africanisation agenda. A quest for decoloniality and Africanity was manifest in many ways. However, efforts to decolonise media and communication studies have so far been “media centric”. Outliers such as Public Relations have been left out of urgent debates on decoloniality. This thesis addresses this gap by centring local epistemes in public relations in ways that decolonise political communication, using Ghana as a case study. Despite the growth of democracy in Africa over the last few decades, democratisation in Africa has met with many problems and the role of public relations in Africa’s democratisation is arguably adding to the existing problems. The overarching purpose of this dissertation was to investigate how political parties have utilised decolonised Public Relations (PR), PR strategies, tactics and activities in Ghana’s electioneering campaigns. More importantly, this research was aimed at decolonising Public Relations in Africa by examining the decolonial political PR strategies political parties deploy to win elections. Proverbs instead of global North theories are used to explain what the political parties do in terms of Public Relations. The study employed in-depth interviews and triangulated with a content analysis of media archives. The findings of the research show that while there are opportunities for decolonising PR, the curriculum has to change to reflect the call for decolonised PR. The findings also show that public relations has furthered Ghana’s democracy and ensured that the two main political parties engage voters. Challenges and limitations notwithstanding, the research provides invaluable insights into how African thought and knowledge systems can be applied in public relations, political communication, and its implications for democratisation in Ghana. It contributes original insights to recent debates on decolonisation in African communication and media studies and the subsequent impact of political communication in the African context

Signaling for conferencing in mobile ad hoc networks

Mobile Ad hoc NETworks (MANETs) are networks that do not need to be pre-configured. They are composed of transient nodes connected through wireless interfaces. Due to their flexibility, the ease to build and the associated low cost, they are gaining more and more momentum. They are also seen as part of the fourth generation wireless networks. New applications, such as conferencing, are emerging for such networks. Conferencing enables a set of applications such as audio/video conferencing, debating, distance-learning and multi-party gaming. The implementation of conferencing in MANETs is not an easy task due to scarce network resources, heterogeneous devices, frequently changing topology and unstable wireless connections. It challenges each technical aspect of conferencing: signaling, media handling and conference control. Signaling is the control component of conferencing. It handles the session initiation, modification and termination. In this work, we focus on signaling for conferencing in MANETs. Two types of MANETs are considered: standalone MANETs and integrated MANETs/3G networks. Background information is provided, requirements are derived and the state of the art, including signaling protocols such as SIP and H.323, are reviewed. Since there is no existing solution that meets all of the derived requirements, we propose a novel cluster-based signaling architecture that meets the requirements of signaling for standalone MANETs. The clusters are application-layer clusters that are dynamically created and deleted for a conference. We also propose a signaling architectures for integrated MANETs/3G networks. The solution is based on conference gateways. We implement the architectures using SIP extensions. Experimental results are obtained from prototypes and OPNET based simulations. In the prototype, we built the signaling system on a small scale network using IEEE 802.11 ad hoc settings. In the OPNET simulation, we use MANET features. From experiments, we found that clustering is a very promising approach for solving signaling problems in MANETs. Being aware of several performance issues of our signaling systems, we further propose optimization schemes that are based on cross-layer design. We also implement some of these schemes and apply them to our signaling systems. The evaluation shows that the schemes significantly improve the signaling performance

MediaSync: Handbook on Multimedia Synchronization

This book provides an approachable overview of the most recent advances in the fascinating field of media synchronization (mediasync), gathering contributions from the most representative and influential experts. Understanding the challenges of this field in the current multi-sensory, multi-device, and multi-protocol world is not an easy task. The book revisits the foundations of mediasync, including theoretical frameworks and models, highlights ongoing research efforts, like hybrid broadband broadcast (HBB) delivery and users' perception modeling (i.e., Quality of Experience or QoE), and paves the way for the future (e.g., towards the deployment of multi-sensory and ultra-realistic experiences). Although many advances around mediasync have been devised and deployed, this area of research is getting renewed attention to overcome remaining challenges in the next-generation (heterogeneous and ubiquitous) media ecosystem. Given the significant advances in this research area, its current relevance and the multiple disciplines it involves, the availability of a reference book on mediasync becomes necessary. This book fills the gap in this context. In particular, it addresses key aspects and reviews the most relevant contributions within the mediasync research space, from different perspectives. Mediasync: Handbook on Multimedia Synchronization is the perfect companion for scholars and practitioners that want to acquire strong knowledge about this research area, and also approach the challenges behind ensuring the best mediated experiences, by providing the adequate synchronization between the media elements that constitute these experiences