This study examines information disclosure of Facebook users in America and Kenya. The main aim of this study is to find out the specific type of personal and demographic information that individuals disclose on their profiles. The literature review details the nature of social networking sites highlighting studies that have been carried out in the past on these sites. Self-disclosure is also discussed as described in the social penetration theory. An overview of the practice of public relations profession in Kenya is also given. The research study employs the content analysis methodology, with a total of 500 Facebook profiles being analyzed. Results of this study indicate that users disclose a lot of information on their Facebook profiles such as the use of a self-portrait as the main identifying mark on their profiles, their dates of birth, personal information such as religious and political views and education and work information. There are also major gender differences in information disclosure. There are also differences in information disclosure on Facebook between American users and Kenyan users. / Department of Journalism

Motivated by potential applications in wireless sensor networks, this thesis considers the problem of communicating a large number of correlated analog sources over a Gaussian multiple-access channel using non-orthogonal code-division multiple-access (CDMA). A joint source-channel decoder is presented which can exploit the inter-source correlation for interference reduction in the CDMA channel. This decoder uses a linear minimum mean square error (MMSE) multi-user detector (MUD) in tandem with a MMSE joint source decoder (JSD) for multiple sources to achieve a computational complexity that scales with the number of sources. The MUD and the JSD, then iteratively exchange extrinsic information to improve the interference cancellation. Experimental results show that, compared to a non-iterative decoder, the proposed iterative decoder is more robust against potential performance degradation due to correlated channel interference and offers better near far resistance.

The research reported in this thesis had two aims. To investigate how the variability and complexity of the mobile context of use should be addressed when capturing user needs for mobile products and to explore the role of indirect methods of data capture as tools for eliciting user needs in a form appropriate for informing the scenario based design of mobile products during the. earliest stages of product development. This research presents a novel scenario-based approach to eliciting and representing user needs in a form suitable for informing the earliest exploratory stages of mobile product design. Within this approach scenarios are used to provide snapshots of actual or envisaged product use that can be used to find a starting point for design when there is no clearly defined focus for innovation. Scenarios are organized into sets using scenario tables to structure consideration of key variables within the mobile context of use. These key variables are identified as: mobility, emotion, social relationship and communication purpose. Three user studies were conducted using UK undergraduate students as the study population. Study One explored use of schematic representations ('maps') of each participant's social communications and mobility as tools for eliciting user needs, both in relation to existing mobile product use and in relation to projected use of future mobile product concepts. Study Two used a diary study method to explore existing mobile communications use. Ways of structuring consideration of the mobile context of use were explored and the effectiveness of the diary as a tool for eliciting user needs and for scenario generation was assessed. Study Three extended the diary study approach to include consideration ofthe emotional context of product use and to include pictorial feedback of diary entries to study participants. These personal representations of product use were used to further explore user needs and to prompt participants to generate narratives describing motivations for product use suitable for presentation in scenario form.

Relevance assessing is an important part of information retrieval (IR) evaluation in addition to being something that all users of IR systems must do as part of their search for relevant documents. In this thesis, we present a user study conducted to understand the relevance judging behaviour of assessors when the prevalence of relevant documents in a set of documents to be judged is varied. In our user study, we collected judgements of participants on document sets of three different prevalence levels. The prevalence levels that we used were low (0.1), balanced (0.5) and high (0.9). We found that participants who judged documents at the 0.9 level made the most mistakes, and participants who judged documents at the 0.5 level made the least mistakes. We did not find a statistically significant difference in judging quality between 0.1 and 0.5 prevalence levels.

User-product interaction is a multi-dimensional, multi-faceted and multi-modal everyday encounter. This study concentrates on the two most prominent actors of this interaction, namely, the user and the product, whereby user expertise and product innovativeness are given special attention. Prominence of user expertise in new product encounters, especially those with innovative products, is established through the findings of two case studies.

Technology used in the Swedish workplace is perceived to be controlling, gener- ally still difficult to use, and with a low degree of usability. Even though the field of Human-Computer Interaction (HCI) has been concerned with researching different ways of developing usable systems for at least half a century, there seem to be problems with the diffusion of the results into practice. One of the possible approaches to developing usable systems is user-centred design, and in this thesis I am concerned with the issue of introducing user-centred design and usability work in public authorities and institutions. I will present work done in two different research projects with a focus on change, where the aim has been to introduce or enhance usability work. Through a lens of social construction- ism and reflexivity I will explore the outcome of the projects and the implica- tions for the introduction of user-centred design in practice. Furthermore, I will explore whether the focus on the introduction of usability work might hinder the formation of a sustainable change in the organizations interested in devel- oping usable systems. The research question then becomes; can we introduce usability work in organizations? The answer to this question is no. Instead, we need to change our perspective from introduction to situated reflexive change: focusing on sensemaking and a situated process of ongoing change, where the stakeholders in the organization themselves must play an active and responsible part. This entails a shift from dualism to duality and a reconsideration of what our usability methods can con- tribute with. Furthermore, I will explore possible approaches to working with situated reflexive change with tools that are familiar in the field of HCI, but with an expanded scope. In particular I will discuss field studies conducted by system developers as a tool for making sense of usability issues, personas as a tool for inducing reflexivity in and on practice, and usability coaching as a sensemaking tool for both organizational stakeholders and researchers in order to understand and reflect upon change. / <p>QC 20130118</p>

Thesis (M.S.)--Rochester Institute of Technology, 2008. / Typescript. Accompanying CD-R contains PDF version of the thesis. Includes bibliographical references (leaves 29-31).

Thesis (Ph.D.)--University of Wollongong, 2004. / Typescript. This thesis is subject to a 2 year embargo (16/09/2004 to 16/09/2006) and may only be viewed and copied with the permission of the author. For further information please Contact the Archivist. Includes bibliographical references: p. 360-374.

Thesis (Ph.D.)--University of Wollongong, 2005. / Typescript. Includes bibliographical references: leaf 257-276.

Thesis (PhD) - Swinburne University of Technology, 2006. / [Submitted for the degree of Doctor of Philosophy, Swinburne University of Technology - 2006]. Typescript. Includes bibliographical references (p. 218-231).