Raimund Schatz

AIT Austrian Institute of Technology | ait · Technology Experience

In this paper, we demonstrate how to utilize acceptance modeling in UX optimization via an adapted Technology Acceptance Model (TAM), which was applied in an industrial software development context. We evaluated a new Android launcher application that changes the user interface of smartphones to better match the needs of elderly users. Our findings...

The situatedness of researchers and developers influences the whole research process from ideas to methods to results. To assess the diversity of perspectives in the QoE field, we conducted a quantitative content analysis of QoMEX proceedings authorship examining five years of the locality of authors (2015-2019) and two years of gender and author t...

Background Mobile app–based therapies are increasingly being employed by speech-language pathologists in the rehabilitation of people with aphasia as adjuncts or substitutes for traditional in-person therapy approaches. These apps can increase the intensity of treatment and have resulted in meaningful outcomes across several domains. Objective Voic...

BACKGROUND Mobile application-based therapies are increasingly being employed by speech-language pathologists in the rehabilitation of people with aphasia (PwA) as an adjunct or in lieu of traditional in-person therapy approaches. These apps can increase the intensity of treatment, and have been shown to result in meaningful outcomes across several...

Learning success in assembly training using immersive virtual reality technologies depends on multiple factors ranging from quality levels of process and technical documentation, visual 3D rendering quality, maturity of didactic concepts to individual differences and attitudes of workers and trainers. In this paper, we present the results of a fiel...

Technological improvements are rapidly ad-vancing holographic-type content distribution. Significantresearch efforts have been made to meet the low-latencyand high-bandwidth requirements set forward by interac-tive applications such as remote surgery and virtual reality.Recent research made six degrees of freedom (6DoF) forimmersive media possible,...

Technological improvements are rapidly advancing holographic-type content distribution. Significant research efforts have been made to meet the low latency and high bandwidth requirements set forward by interactive applications such as remote surgery and virtual reality. Recent research made six degrees of freedom (6DoF) for immersive media possibl...

This article provides insights towards the Telepresence Robot (TPR) QoE research agenda and summarizes the findings of a TPR QoE study as provided in H. Z. Jahromi, I. Bartolec, E. Gamboa, A. Hines and R. Schatz, "You Drive Me Crazy! Interactive QoE Assessment for Telepresence Robot Control," 2020 Twelfth International Conference on Quality of Mult...

With the coming of age of virtual/augmented reality and interactive media, numerous definitions, frameworks, and models of immersion have emerged across different fields ranging from computer graphics to literary works. Immersion is oftentimes used interchangeably with presence as both concepts are closely related. However, there are noticeable int...

Volumetric media has the potential to provide the six degrees of freedom (6DoF) required by truly immersive media. However, achieving 6DoF requires ultra-high bandwidth transmissions, which real-world wide area networks cannot provide today. Therefore, recent efforts have started to target efficient delivery of volumetric media, using a combination...

With the coming of age of virtual/augmented reality and interactive media, numerous definitions, frameworks, and models of immersion have emerged across different fields ranging from computer graphics to literary works. Immersion is oftentimes used interchangeably with presence as both concepts are closely related. However, there are noticeable int...

Telepresence robots (TPRs) are versatile, remotely controlled vehicles that enable physical presence and human-to-human interaction over a distance. Thanks to improving hardware and dropping price points, TPRs enjoy the growing interest in various industries and application domains. Still, a satisfying experience remains key for their acceptance an...

Autonomous buses are expected to become a cornerstone of future mobility systems. Especially during their introduction, passengers may require reassurance about the vehicle’s awareness of the situation on the road and of its intended next actions to further acceptance. In order to investigate the need and requirements for information about the vehi...

Omnidirectional video (ODV) streaming applications are becoming increasingly popular. They enable a highly immersive experience as the user can freely choose her/his field of view within the 360-degree environment. Current deployments are fairly simple but viewport-agnostic which inevitably results in high storage/bandwidth requirements and low Qua...

In this paper, we evaluate the influence of different VR rendering styles on the QoE of users of a training application. To this end, we present the results of a lab-based QoE study featuring a virtual manufacturing training setting in which participants were asked to correctly allocate spare parts to mounting locations inside and outside a vehicle...

This chapter discusses prospects of QoE management for future networks and applications. After motivating QoE management, it first provides an introduction to the concept by discussing its origins, key terms and giving an overview of the most relevant existing theoretical frameworks. Then, recent research on promising technical approaches to QoE-dr...

This article addresses the overall relevance and the influence of user expectations in the context of perceptual quality evaluation of technical systems, and how information about individual expectations can be integrated into research on Quality of Experience (QoE). Based on a literature survey on expectations in the fields of psychology, service...

Radio scheduling is a well-studied problem that has challenged researchers throughout the last decades. However, recent findings that stem from the Quality of Experience (QoE) domain come to give a new perspective to traditional radio scheduling approaches. In this paper, we take advantage of recent subjective results regarding the impact of throug...

Network monitoring and reporting systems as well as network quality benchmarking campaigns use the Average Downlink Throughput (ADT) as the main Key Performance Indicators (KPIs) reflecting the health of the network. In this paper we address the problem of network performance monitoring and assessment in operational networks from a user-centric, Qu...

A quarter of the world population will be using smartphones to access the Internet in the near future. In this context, understanding the quality of experience (QoE) of popular apps in such devices becomes paramount to cellular network operators, who need to offer high-quality levels to reduce the risks of customers churning for quality dissatisfac...

Today’s packet-switched networks are subject to bandwidth fluctuations that cause for degradation of user experience of multimedia services. In order to cope with this problem,HTTP Adaptive Streaming (HAS) has been proposed in recent years as a video delivery solution for the future Internet and being adopted by an increasing number of streaming ser...

In this demonstration, we present YoMoApp (YouTube Performance Monitoring Application), a passive measurement application for client side monitoring of YouTube video streaming on mobile Android devices. The application uses the YouTube mobile website and the HTML5 API to exactly replicate the well-known YouTube service, which employs HTTP adaptive...

The performance of YouTube in cellular networks is crucial to network operators, who try to find a trade-off between cost-efficient handling of the huge traffic amounts and high perceived end-user Quality of Experience (QoE). In this paper we present YoMoApp (YouTube Performance Monitoring Application), an Android application which passively monito...

A quarter of the world population will be using smartphones to access the Internet in the near future. In this context, understanding the Quality of Experience (QoE) of popular services in such devices becomes paramount for cellular network operators, who need to offer high quality levels to reduce the risks of customers churning for quality dissat...

The systematic investigation of network bandwidth fluctuations and their impact on Quality of Experience (QoE) has recently gained center stage, not only in academia but also among network providers. This development is driven by the fact that in a real world usage scenario, volatile network performance (and thus varying QoE) actually is the norm,...

The performance of YouTube in mobile networks is crucial to network operators, who try to find a trade-off between cost-efficient handling of the huge traffic amounts and high perceived end-user Quality of Experience (QoE). This paper introduces YoMoApp (YouTube Performance Monitoring Application), an Android application, which passively monitors k...

5G is rapidly moving from vision to reality and there is already some consensus regarding the technical requirements of 5G. Traditionally, performance monitoring based on existing standards has been focusing on technical Key Performance Indicators (KPIs). However, it is actually more important to focus on Quality of Experience (QoE) directly. Servi...

Although web applications are well known for performance variations during a session, the impact of network quality fluctuations on user-perceived quality has been neglected so far in QoE research. In this paper, we present the results of two subjective lab experiments which investigated the influence of outages, throughput alternations and increas...

Current QoE assessment approaches predominantly treat endusers as passive consumers of the services provided by the system under test. As a consequence, we witness a lack of evaluation methods suitable for real-world economic scenarios in which subjects actually represent active, decisionmaking agents. In this paper we provide guidance on how to co...

Changing network conditions like bandwidth fluctuations and resulting bad user experience issues (e.g. video freezes) pose severe challenges to Internet video streaming. To address this problem, an increasing number of video services utilizes HTTP adaptive streaming (HAS). HAS enables service providers to improve Quality of Experience (QoE) and res...

Cloud-based systems are gaining enormous popularity due to a number of promised benefits, including ease of deployment and administration, scalability and flexibility, and costs savings. However, as more personal and business applications migrate to the Cloud, the service quality becomes an important differentiator between providers. ISPs, Cloud pr...

This work analyses the interaction behaviour of two interlocutors communicating over telephone connections affected by echo-free delay, for conversation tasks yielding different speed and structure. Based on a series of conversation tests, it is shown that transmission delay in a telephone circuit does not only result in a longer time until informa...

Cloud-based systems are gaining enormous popularity due to a number of promised benefits, including ease of use in terms of deployment, administration and maintenance, high scalability as well as flexibility to create new services. However, as more personal and business applications migrate to the Cloud, the service quality becomes an important dif...

Since its introduction a few years ago, the concept of 'Crowdsourcing' has been heralded as highly attractive alternative approach towards evaluating the Quality of Experience (QoE) of networked multimedia services. The main reason is that, in comparison to traditional laboratory-based subjective quality testing, crowd-based QoE assessment over the...

The Internet’s infrastructure shows severe limitations when an optimal end user experience for multimedia applications should be achieved in a resource-efficiently way. In order to realize truly user-centric networking, an information exchange between applications and networks is required. To this end, network-application interfaces need to be depl...

The Chapter provides an overview of Quality of Experience research for web-browsing, highlighting recent research trends. It indicates how Web-QoE assessment has evolved from the mapping of technically measured page-load times to quality estimates to the notion of perceived page-load time. Here, the consideration of the user’s current task and resp...

This chapter presents an overview of a set of recently proposed QoE-based management approaches that all try so resolve a central dilemma: maximizing user satisfaction while at the same time maximizing resource efficiency and economy. To this end, it first builds bridges between recent approaches towards QoE-based Network Management and standardize...

Video streaming currently dominates global Internet traffic and will be of even increasing importance in the future. In this paper we assess the impact of the underlying transport protocol on the user perceived quality for video streaming using YouTube as example. In particular, we investigate whether UDP or TCP fits better for Video-on-Demand deli...

YouTube is changing the way operators manage network performance monitoring. In this paper we introduce YOUQMON, a novel on-line monitoring system for assessing the Quality of Experience (QoE) undergone by HSPA/3G customers watching YouTube videos, using network-layer measurements only. YOUQMON combines passive traffic analysis techniques to detect...

It is our pleasure to welcome you to QoMEX 2013, the Fifth International Workshop on Quality of Multimedia Experience, in Klagenfurt am Wörthersee, Austria.

We are witnessing a dramatic rise of cloud-based media services nowadays, not only in terms of importance to end users but also in terms of traffic volume - a challenge for network and service providers alike. However, while the Quality of Experience of cloud-based video streaming services like YouTube has already become a well studied subject, thi...

Personal Cloud Storage and File Synchronization (CSFS) applications such as Dropbox, Google Drive, and Sky Drive among others are rapidly gaining attention within the Internet community. Recent studies have shown that just Dropbox can account for a traffic volume as high as one third of the YouTube traffic in campus networks, evidencing an overwhel...

YouTube, the killer application of today's Internet, is changing the way ISPs and network operators manage quality monitoring and provisioning on their IP networks. YouTube is currently the most consumed Internet application, accounting for more than 30% of the overall Internet's traffic worldwide. Coupling such an overwhelming traffic volume with...

Qualinet White Paper on Definitions of Quality of Experience Output from the fifth Qualinet meeting, Novi Sad, March 12, 2013

Utility functions, describing the value of a good or a resource from an end user’s point of view, are widely used as an important ingredient for all sorts of microeconomic models. In the context of resource allocation in communication networks, a logarithmic version of utility usually serves as the standard example due to its simplicity and mathema...

Video streaming over wireless broadband is currently accounting for half of the world-wide mobile data traffic, and its share is expected to increase even further. As a consequence, mobile operators need to understand how Quality of Experience (QoE) of mobile streamed video is impacted by the network delivery. With the HTTP-based video streaming us...

This chapter investigates HTTP video streaming over the Internet for the YouTube platform. YouTube is used as concrete example and case study for video delivery over the Internet, since it is not only the most popular online video platform, but also generates a large share of traffic on today's Internet. We will describe the YouTube infrastructure...

This special issue cannot be produced without the effort of all the authors that responded to the call for papers and the work of the external reviewers. We are grateful to all of them.

Remote Virtual Desktop (RVD) services provide flexible and cost-effective means to deliver virtual PCs to endusers. RVD services have been traditionally deployed in enterprise LAN scenarios, where network performance is optimal and the Quality of Experience (QoE) undergone by its users is generally not an issue. However, the need for mobility of RV...

Over the course of the last decade, the concept of Quality of Experience (QoE) has gained strong momentum, both from an academic research and an industry perspective. Being linked very closely to the subjective perception of the end user, QoE is supposed to enable a broader, more holistic understanding of the qualitative performance of networked co...