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Sebastian Egger-Lampl

Sebastian Egger-Lampl
UGP

Ing., Mag. phil, Dipl.-Ing., Dr. techn.

About

82
Publications
27,676
Reads
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3,736
Citations
Additional affiliations
March 2014 - November 2021
AIT Austrian Institute of Technology
Position
  • Researcher
Description
  • Scientist, Business Manager and Scientific Coordinator of the Center
August 2013 - December 2013
Telekom Innovation Laboratories
Position
  • Researcher
March 2007 - April 2014
Forschungszentrum Telekommunikation Wien
Position
  • Researcher
Education
October 2009 - June 2014
Graz University of Technology
Field of study
  • Information and Communications Engineering

Publications

Publications (82)
Article
Full-text available
Background The COVID-19 pandemic has exerted great pressure on national health systems, which have aimed to ensure comprehensive healthcare at all times. Healthcare professionals working with COVID-19 patients are on the frontline and thereby confronted with enormous demands. Although early reports exist on the psychological impact of the pandemic...
Conference Paper
Haptic qualities of surfaces play an important role for the user's experience with a system. In that context, soft touch surfaces are important as they are often used for surfaces of industrial products. For assessing related experiences, research is often focusing on physical properties of the surfaces rather than the (quality of) experience of th...
Article
Virtual Reality (VR) is increasingly being used in the area of training. Especially for professions where errors can cost human lives, VR simulation training can be valuable. Therefore, VR is very suited to improve CBRNe training. To maximize the effectiveness of VR training, it is imperative that such a CBRNe VR training is introduced and implemen...
Conference Paper
Full-text available
Virtual Reality (VR) training has become increasingly important for police first responders in recent years. Improving the training experience in such complex contexts requires ecological validity of virtual training. To achieve this, VR systems need to be capable of simulating the complex experiences of police officers ‘in the field.’ Oneway to do...
Chapter
Full-text available
This paper presents assistance needs in production environments for assembly processes from a workers’ perspective, i.e. what kind of assistance assembly workers would need to enhance their everyday work experience and to better cope with challenges coming along with an increasing digitization in these work environments. Within a large-scale empiri...
Chapter
Full-text available
This paper presents a study investigating the user acceptance (i.e. the perceived ease of use, willingness to use the system over time, and perceived usefulness) of a smart head-mounted device that can be used as assistive technology for maintenance and assembly. In particular, we focus on the head-mounted display named HMT-1 from RealWear. The uni...
Article
Full-text available
Purpose: Facing the COVID-19 pandemic, police officers are confronted with various novel challenges, which might place additional strain on officers. This mixed-method study investigated officers' strain over a three-month-period after the lockdown. Methods: In an online survey, 2567 police officers (77% male) from Austria, Germany, Switzerland, th...
Article
In sports, police service, and military, actors are required to exert peak performance in cognitive and perceptual motor tasks under risky circumstances that are both psychologically and physically challenging. Those situations, that are often characterized by a threat to physical integrity, trigger psychophysiological stress reactions which can im...
Preprint
Full-text available
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...
Technical Report
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...
Article
Full-text available
So far, research on quality-of-experience (QoE) has mostly been carried out in the area of multimedia communications, and user experience (UX) has addressed hedonic and pragmatic usage aspects of interactive applications. In the case of QoE, the meaningfulness of the application to the user and the forces driving the use have been largely neglected...
Chapter
Crowdsourcing enables new possibilities for QoE evaluation by moving the evaluation task from the traditional laboratory environment into the Internet, allowing researchers to easily access a global pool of workers for the evaluation task. This makes it not only possible to include a more diverse population and real-life environments into the evalu...
Chapter
Full-text available
Crowdsourcing solutions are increasingly being adopted across a variety of domains these days. An important consequence of the flourishing crowdsourcing markets is that experiments which were traditionally carried out in laboratories on a much smaller scale can now tap into the immense potential of online labor. Researchers in different fields have...
Article
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...
Chapter
Given recent demographic changes, adapting the office environments of older knowledge workers to their needs has become increasingly important in supporting an extension of working life. In this paper, we present a case study research of older knowledge workers in Romania, with the goal of gaining bottom-up insights that support the ideation, desig...
Conference Paper
In this work, we identify influencing factors on modality choices of older adults. In detail, we investigated when and why older adults prefer speech over touch interaction and vice versa when interacting with a mobile multimodal health and wellbeing service. We conducted a study with 19 older adults using a mobile application with a duration of th...
Conference Paper
Crowdsourcing (CS) has evolved into a mature assessment methodology for subjective experiments in diverse scientific fields and in particular for QoE assessment. However, the results acquired for absolute category rating (ACR) scales through CS are often not fully comparable to QoE assessments done in laboratory environments. A possible reason for...
Conference Paper
The optimization as well as exploitation of various aspects of user experience is crucial for future technological innovation and adoption. As a consequence of individualization, industrialization and lifestyle orientation, user experience is becoming more and more a major paradigm in the industry as well as in research & technology organizations....
Article
This paper reports on activities in Study Group 12 of the International Telecommunication Union (ITU-T SG12) to define a new Recommendation on subjective evaluation methods for gaming Quality of Experience (QoE). It first resumes the structure and content of the current draft which has been proposed to ITU-T SG12 in September 2014 and then critical...
Conference Paper
Given recent demographic changes, adapting the office environments of older workers to their needs has become increasingly important in supporting an extension of working life. In this paper, we present a case study research of older computer workers in Romania, with the goal of gaining bottom-up in-sights that support the ideation, design, and dev...
Conference Paper
Full-text available
While the modeling of QoE has made significant advances over the last couple of years, currently existing models still lack an integration of user behavior aspects and user context factors along with the consideration of appropriate temporal scales. Therefore, the goal of this paper is to present a comprehensive QoE and user behavior model providin...
Article
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...
Conference Paper
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...
Article
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...
Article
Full-text available
Lessons learned from the Qualinet Task Force "Crowdsourcing" COST Action IC1003 European Network on Quality of Experience in Multimedia Systems and Services (QUALINET)
Conference Paper
Full-text available
Real-world usage of web browsing differs considerably from typically employed laboratory tests on single or multiple page views. Especially when using mobile devices such as smart-phones or tablets, several sources of distraction are prevalent while browsing. In the mobile scenario, users are exposed to distracting factors like other people, traffi...
Article
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...
Conference Paper
Full-text available
HTTP adaptive streaming technology has become widely spread in multimedia services because of its ability to provide adaptation to characteristics of various viewing devices and dynamic network conditions. There are various studies targeting the optimization of adaptation strategy. However, in order to provide an optimal viewing experience to the e...
Conference Paper
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...
Technical Report
Full-text available
Changing network conditions pose severe problems to video streaming in the Internet. HTTP adaptive streaming (HAS) is a technology employed by numerous video services that relieves these issues by adapting the video to the current network conditions. It enables service providers to improve resource utilization and Quality of Experience (QoE) by inc...
Chapter
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...
Chapter
This chapter discusses the relation between interactivity and QoE. In this context, a definition of interactivity comprising human-to-human interaction as well as human-to-machine interaction is presented, and a description of a possible instrumentation is given. In terms of quality formation, a mediation layer between quality influence factors and...
Chapter
The chapter discusses the processes of human perception and experiencing, and of quality formation. In this context, definitions of relevant terms are re-visited and adapted to the presented, updated view, and different aspects of research into quality at large and into Quality of Experience are summarized. Using a conceptual model, the quality for...
Conference Paper
Brief episodes of network faults and performance issues adversely affect the user Quality of Experience (QoE). Besides damaging the current opinions of users, these events may also shape user's future perception of the service. Therefore, it is important to quantify the impact of such events on QoE over time. In this paper, we present our findings...
Conference Paper
Full-text available
A new model of speech quality under delay is presented that includes conversational interactivity. It is based on two previously reported narrowband telephony conversation tests involving different delays, with subject-pairs judging overall quality after each conversation. The tests were conducted with different conversation scenarios targeting dif...
Conference Paper
Current objective video quality metrics typically estimate video quality for short video sequences (10 to 15 sec) of constant quality. However, customers of video services usually watch longer sequences of videos which are more and more delivered via adaptive streaming methods such as HTTP adaptive streaming (HAS). A viewing session in such a setti...
Conference Paper
Full-text available
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...
Book
Full-text available
Qualinet White Paper on Definitions of Quality of Experience Output from the fifth Qualinet meeting, Novi Sad, March 12, 2013
Conference Paper
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...
Chapter
Full-text available
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...
Conference Paper
In contrast to traditional QoS-based charging, charges for QoE (Quality of Experience) play a double role both as part of the evaluation context and as counterpart of the user's willingness-to-pay for service quality. To further investigate this link between pricing and QoE, we combine some unexpected results from empirical quality perception exper...
Conference Paper
Full-text available
YouTube and Facebook are two of the most consumed applications in today's Internet. Together they account for more than 30% of the overall Internet's traffic volume and span more than half of the Internet users worldwide. Such popularity has attracted a growing interest from the research community, particularly regarding content characterization, n...
Conference Paper
Full-text available
End user quality perception in the context of Internet applications is often characterized by waiting times before service consumption as well as interruptions during service consumption. In particular in case of bad network conditions, network and service providers have to trade off between these two impairment types, i.e. between the devil and th...
Conference Paper
A considerable share of applications such as web or e-mail browsing, online picture viewing and file downloads imply waiting times for their users, which is due to the turn-taking of information requests by the user and correspoding response times until each request is fulfilled. Thus, end-user quality perception in the context of interactive data...
Conference Paper
Studying the connection between QoE and QoS and its implications for network and content providers has yielded a couple of well-established experimental approaches. However, research in this field has mainly neglected economical aspects of user trials. This paper describes and evaluates an extended experimental setup to investigate willingness-to-p...
Conference Paper
Standard methodologies for subjective video quality testing are based on very short test clips of 10 seconds. But is this duration sufficient for Quality of Experience assessment? In this paper, we present the results of a comparative user study that tests whether quality perception and rating behavior may be different if video clip durations are l...
Conference Paper
Within QoE research it has become a generally acknowledged fact that user expectations can have considerable impact on subjective quality perception. In order to empirically quantify this influence we conducted a user study on expectations caused by the type of access network used. Study participants were asked to rate the QoE of various broadband...
Conference Paper
Full-text available
Over the last couple of years, the scope of Quality of Experience (QoE) research has been constantly extended, most recently to the field of Web QoE in the context of HTTP-based applications. In this paper, we address the question whether it is sufficient to reduce typical Web QoE assessment scenarios to the temporal aspects of waiting for task com...
Conference Paper
In this paper we demonstrate how speech signal features can be used to detect and explain differences in human to human conversation tests. To this end, we compare the results of two conversational VoIP quality experiments designed to quantify the impact of network delay on perceived speech quality. Both studies followed the same procedures and use...
Article
This article investigates the influence of test duration on user fatigue and the reliability of user ratings in the context of subjective Quality-of-Experience (QoE) assessment. The goal is to provide empirically grounded guidance for the design of lab-based quality experiments, particularly as concerns the overall duration of test sessions. Since...
Conference Paper
Full-text available
When it comes to analysis and interpretation of the results of subjective QoE studies, one often witnesses a lack of attention to the diversity in subjective user ratings. In extreme cases, solely Mean Opinion Scores (MOS) are reported, causing the loss of important information on the user rating diversity. In this paper, we emphasize the importanc...
Conference Paper
Full-text available
Quality of Experience (QoE) has gained enormous attention during the recent years. So far, most of the existing QoE research has focused on audio and video streaming applications, although HTTP traffic carries the majority of traffic in the residential broadband Internet. However, existing QoE models for this domain do not consider temporal dynamic...
Article
Full-text available
This paper presents our findings from a mobile broadband QoE field trial conducted in the city of Vienna, Austria. Using their own laptops in everyday contexts, participants regularly assessed the quality of their mobile broadband connection (tasks: web surfing, file downloads) which in the background was manipulated via traffic shaping throughout...