Methods for Objective and Subjective Evaluation of Zero-Client Computing

Zero clients are hardware-based devices without a central processing unit (CPU) that deliver virtual desktops (VDs) from remote computing systems to users. We measured the performance of applications accessed through zero clients to study the feasibility of using this approach to provide a desktop-pc experience across a network. Performance evaluation is complicated because monitoring software cannot be downloaded to the zero clients. Therefore, we introduce a new methodology and metric to measure zero-client VD performance that is based on network-traffic analysis. We conducted objective and subjective studies to determine the sensitivity of application-specific metrics to different network conditions. The results show that the packet loss rate (PLR) impacts zero-client performance for some applications such as video streaming. Subjective tests showed a greater user sensitivity to the PLR for video streaming than for image viewing or Skype. A strong correlation was found between the objective and subjective measurements but the rate at which these measurements changed with increasing PLR differed depending on the application.NSF [CNS-1737453]Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Conceptualization and Realization of a Database Migration Path for an International and mHealth Tinnitus Database

The mobile crowdsensing platform TrackYourTinnitus (TYT) was created to monitor and visualize fluctuations of tinnitus perception by affected individuals using smart devices. The platform aims to gather data of tinnitus patients for research purposes and to help those affected to better understand the fluctuations of tinnitus perception. Users have to answer specific questionnaires to assess tinnitus perception and tinnitus-related parameters during their daily routine. The gathered data from the questionnaires are stored in the MariaDB database running on the back-end of the application. In the future, the data of TrackYourTinnitus will be merged with clinical databases to broaden the researches related to the tinnitus symptom. Consequently, the amount of data stored in the relational database will notably increase. Additionally, MRI scans will be joined to patients? data to allow a better overview of the tinnitus development for individuals. For this purpose, it is considered to look for an alternative system for hosting the TYT database, since the current database running on MariaDB does not deliver the performance required. This work attempts to transfer the TrackYourTinnitus database from MariaDB to SQL Server. The system migration aims to ensure smooth database operations when dealing with data on a large scale as well as to benefit from the advanced features of T-SQL, the query language used by SQL Server

Layered evaluation of interactive adaptive systems : framework and formative methods

Peer reviewedPostprin

Towards a kansei-based user modeling methodology for eco-design

We propose here to highlight the benefits of building a framework linking Kansei Design (KD), User Centered Design (UCD) and Eco-design, as the correlation between these fields is barely explored in research at the current time. Therefore, we believe Kansei Design could serve the goal of achieving more sustainable products by setting up an accurate understanding of the user in terms of ecological awareness, and consequently enhancing performance in the Eco-design process. In the same way, we will consider the means-end chain approach inspired from marketing research, as it is useful for identifying ecological values, mapping associated functions and defining suitable design solutions. Information gathered will serve as entry data for conducting scenario-based design, and supporting the development of an Eco-friendly User Centered Design methodology (EcoUCD).ANR-ECOUS

Gender Differences in the Determinants of Sharing Information via Mobile Phones

The notion of sharing information has become a critical element in competitive advantage for mobile phone companies. The purpose of this particular research is to collate, compare and prioritize gender differences in the determinants of sharing information via mobile phones. The content analysis and the analytic hierarchy process methods were made use of to collect and examine relevant data. According to the findings of this research, the determinants of information sharing via mobile phones may be arranged into four fundamental categories. The categories, in order of significant, are: situational factors (including time pressures, convenience, and price discounts), the unique characteristics of mobile phone senders (including personality, emotion, and verbal capability), informational factors (including private information, important information and interesting information), and mobile phone receivers (including personality, emotion, and verbal capability). There is no singular gender difference in the first two factors (situational factors and mobile phone senders). The results gauge and assess the determinants of information sharing by the way of mobile phones

Understanding international users' library experience in the Digital Age – joining the behavioral and experiential aspects

Purpose: The purpose of this paper is to describe, analyze and understand international users' library experience in the Digital Age in order to inform library service design and ensure it provides an inclusive environment. In this study, the behavioral and experiential aspects of user library experience are merged to develop essential interconnections between information behavior (IB) and user experience (UX) in the context of the academic library with the goal of constructing a more holistic understanding of ‘library experience. Design/methodology/approach: The study was built on the concept “library experience” through analyzing its essential components of IB and UX. It was developed through findings from mixed methods research, consisting of the quantitative investigation from a library log analysis, and qualitative investigations via cognitive mapping exercises and semi-structured interviews, both targeted on the largest single group of international students in United Kingdom – international Chinese students. Findings: The findings demonstrated the complexity and multilayered characteristics of international Chinese students' library context, and three unique contexts emerged from the data shaping their library experience. Building on the previous findings on the connections between IB and UX, the work attempted to redefine “library experience” by joining both behavioral and experiential aspects. It is found that the key components of cultural library experience are the multilayered context, cultural group's perception needs, sense-making process and subjective evaluations. Originality/value: This study joins the behavioral and experiential perspectives together to explore library experience in a more holistic way and proposes a systematic structure to understand and analyze library experience, especially that of international users in a cross-cultural context, which, in turn, will better serve their information needs and inform the design of a more equal and inclusive library system

Evaluating humanoid embodied conversational agents in mobile guide applications

Evolution in the area of mobile computing has been phenomenal in the last few years. The exploding increase in hardware power has enabled multimodal mobile interfaces to be developed. These interfaces differ from the traditional graphical user interface (GUI), in that they enable a more “natural” communication with mobile devices, through the use of multiple communication channels (e.g., multi-touch, speech recognition, etc.). As a result, a new generation of applications has emerged that provide human-like assistance in the user interface (e.g., the Siri conversational assistant (Siri Inc., visited 2010)). These conversational agents are currently designed to automate a number of tedious mobile tasks (e.g., to call a taxi), but the possible applications are endless. A domain of particular interest is that of Cultural Heritage, where conversational agents can act as personalized tour guides in, for example, archaeological attractions. The visitors to historical places have a diverse range of information needs. For example, casual visitors have different information needs from those with a deeper interest in an attraction (e.g., - holiday learners versus students). A personalized conversational agent can access a cultural heritage database, and effectively translate data into a natural language form that is adapted to the visitor’s personal needs and interests. The present research aims to investigate the information needs of a specific type of visitors, those for whom retention of cultural content is important (e.g., students of history, cultural experts, history hobbyists, educators, etc.). Embodying a conversational agent enables the agent to use additional modalities to communicate this content (e.g., through facial expressions, deictic gestures, etc.) to the user. Simulating the social norms that guide the real-world human-to-human interaction (e.g., adapting the story based on the reactions of the users), should at least theoretically optimize the cognitive accessibility of the content. Although a number of projects have attempted to build embodied conversational agents (ECAs) for cultural heritage, little is known about their impact on the users’ perceived cognitive accessibility of the cultural heritage content, and the usability of the interfaces they support. In particular, there is a general disagreement on the advantages of multimodal ECAs in terms of users’ task performance and satisfaction over nonanthropomorphised interfaces. Further, little is known about what features influence what aspects of the cognitive accessibility of the content and/or usability of the interface. To address these questions I studied the user experiences with ECA interfaces in six user studies across three countries (Greece, UK and USA). To support these studies, I introduced: a) a conceptual framework based on well-established theoretical models of human cognition, and previous frameworks from the literature. The framework offers a holistic view of the design space of ECA systems b) a research technique for evaluating the cognitive accessibility of ECA-based information presentation systems that combine data from eye tracking and facial expression recognition. In addition, I designed a toolkit, from which I partially developed its natural language processing component, to facilitate rapid development of mobile guide applications using ECAs. Results from these studies provide evidence that an ECA, capable of displaying some of the communication strategies (e.g., non-verbal behaviours to accompany linguistic information etc.) found in the real-world human guidance scenario, is not affecting and effective in enhancing the user’s ability to retain cultural content. The findings from the first two studies, suggest than an ECA has no negative/positive impact on users experiencing content that is similar (but not the same) across different locations (see experiment one, in Chapter 7), and content of variable difficulty (see experiment two, in Chapter 7). However, my results also suggest that improving the degree of content personalization and the quality of the modalities used by the ECA can result in both effective and affecting human-ECA interactions. Effectiveness is the degree to which an ECA facilitates a user in accomplishing the navigation and information tasks. Similarly, affecting is the degree to which the ECA changes the quality of the user’s experience while accomplishing the navigation and information tasks. By adhering to the above rules, I gradually improved my designs and built ECAs that are affecting. In particular, I found that an ECA can affect the quality of the user’s navigation experience (see experiment three in Chapter 7), as well as how a user experiences narrations of cultural value (see experiment five, in Chapter 8). In terms of navigation, I found sound evidence that the strongest impact of the ECAs nonverbal behaviours is on the ability of users to correctly disambiguate the navigation of an ECA instructions provided by a tour guide system. However, my ECAs failed to become effective, and to elicit enhanced navigation or retention performances. Given the positive impact of ECAs on the disambiguation of navigation instructions, the lack of ECA-effectiveness in navigation could be attributed to the simulated mobile conditions. In a real outdoor environment, where users would have to actually walk around the castle, an ECA could have elicited better navigation performance, than a system without it. With regards to retention performance, my results suggest that a designer should not solely consider the impact of an ECA, but also the style and effectiveness of the question-answering (Q&A) with the ECA, and the type of user interacting with the ECA (see experiments four and six, in Chapter 8). I found that that there is a correlation between how many questions participants asked per location for a tour, and the information they retained after the completion of the tour. When participants were requested to ask the systems a specific number of questions per location, they could retain more information than when they were allowed to freely ask questions. However, the constrained style of interaction decreased their overall satisfaction with the systems. Therefore, when enhanced retention performance is needed, a designer should consider strategies that should direct users to ask a specific number of questions per location for a tour. On the other hand, when maintaining the positive levels of user experiences is the desired outcome of an interaction, users should be allowed to freely ask questions. Then, the effectiveness of the Q&A session is of importance to the success/failure of the user’s interaction with the ECA. In a natural-language question-answering system, the system often fails to understand the user’s question and, by default, it asks the user to rephrase again. A problem arises when the system fails to understand a question repeatedly. I found that a repetitive request to rephrase the same question annoys participants and affects their retention performance. Therefore, in order to ensure effective human-ECA Q&A, the repeat messages should be built in a way to allow users to figure out how to ask the system questions to avoid improper responses. Then, I found strong evidence that an ECA may be effective for some type of users, while for some others it may be not. I found that an ECA with an attention-grabbing mechanism (see experiment six, in Chapter 8), had an inverse effect on the retention performance of participants with different gender. In particular, it enhanced the retention performance of the male participants, while it degraded the retention performance of the female participants. Finally, a series of tentative design recommendations for the design of both affecting and effective ECAs in mobile guide applications in derived from the work undertaken. These are aimed at ECA researchers and mobile guide designers

Facilitating Extended Reality in Museums through a Web-Based Application

Masteroppgave i Programvareutvikling samarbeid med HVLPROG399MAMN-PRO