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Using Multivariate Statistics

The measurement of meaning

A wide variety of media can be used in learning, including distance learning, such as print, lectures, conference sections, tutors, pictures, video, sound, and computers. Any one instance of distance learning will make choices among these media, perhaps using several.

Multimedia in Learning

An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article.

The Self-Organizing Map

With digital equipment becoming increasingly networked, either on wired or wireless networks, for personal and professional use alike, distributed software systems have become a crucial element in information and communications technologies. The study of these systems forms the core of the ARLES' work, which is specifically concerned with defining new system software architectures, based on the use of emerging networking technologies. In this context, we concentrate on the study of distributed systems which bring to life the vision of ubiquitous computing systems, also known as ambient intelligence.

반도체 공정 overview

Call Quality Prediction for Audiovisual Time-Varying Impairments Using Simulated Conversational Structures

Despite their basic attractiveness as an interaction paradigm for controlling intelligent environments, the design of spoken dialog systems for this purpose raises some usability challenges that require careful attention. This paper examines closely the communication failures that can occur in the control of one particular type of intelligent environment: a smart home system that provides control for multiple domestic devices through a state-of-the-art mixed-initiative spoken-dialog interface. The 24 participants completed several tasks with the INSPIRE system in a controlled experiment, and interaction failures were categorized with an error taxonomy that is related to more general error taxonomies but specialized to this class of systems. Despite efforts devoted to supporting natural, mixed-initiative dialog and to the prevention of communication failures, over one fourth of user utterances were problematic, often leading to stagnation or regression. The causes and consequences of these problems are discussed, along with their implications for the design of spoken dialog systems for intelligent environments.

Communication failures in the speech-based control of smart home systems

In this paper we describe observed gender differences in the perception of security of mobile phones, especially on authentication and payment-related features and application on smartphones. The data was gathered in a focus group, two surveys and an experiment during November 2009 and September 2011. The data shows significant differences in perceived security and future use of security-related features and applications.

Gender differences in the perception of security of mobile phones

Virtual Reality (VR) has an increasing impact on the market in many fields, from education and medicine to engineering and entertainment, by creating different applications that replicate or in the case of augmentation enhance real-life scenarios. Intending to present realistic environments, VR applications are including text that we are surrounded by every day. However, text can only add value to the virtual environment if it is designed and created in such a way that users can comfortably read it. With the aim to explore what values for text parameters users find comfortable while reading in virtual reality, a study was conducted allowing participants to manipulate text parameters such as font size, distance, and contrast. Therefore two different standalone virtual reality devices were used, Oculus Go and Quest, together with three different text samples: Short (2 words), medium (21 words), and long (51 words). Participants had the task of setting text parameters to the best and worst possible value. Additionally, participants were asked to rate their experience of reading in virtual reality. Results report mean values for angular size (the combination of distance and font size) and color contrast depending on the different device used as well as the varying text length, for both tasks. Significant differences were found for values of angular size, depending on the length of the displayed text. However, different device types had no significant influence on text parameters but on the experiences reported using the self-assessment manikin (SAM) scale.

User Experience of Reading in Virtual Reality -- Finding Values for Text Distance, Size and Contrast

Cloud Gaming is an emerging service that is considered by many as the future of the gaming industry This service requires a highly reliable network with low latency and high bandwidth If these requirements are not satisfied, cloud gaming services cannot create a good Quality of Experience (QoE) for its users However, gaming QoE can vary significantly among different game scenarios and users For an optimal resource allocation and quality estimation, it is highly important for cloud providers, game developers, and network planners to consider the influence of the game content and gamers This paper presents the result of a subjective study that investigated the impact of different player strategies and user inputs on their perceived delay The results indicated that the user input characteristics vary among the games but stays the same between different users and different strategies In addition to the users' inputs, the input quality and the overall gaming experience of the users were also investigated, and results did not show any main effect of user strategy on the delay sensitivity of the games

Sebastian Möller

Papers

Call Quality Prediction for Audiovisual Time-Varying Impairments Using Simulated Conversational Structures

Communication failures in the speech-based control of smart home systems

Gender differences in the perception of security of mobile phones

User Experience of Reading in Virtual Reality -- Finding Values for Text Distance, Size and Contrast

Towards the Impact of Gamers Strategy and User Inputs on the Delay Sensitivity of Cloud Games