Papers by Matevz Pogacnik
Persona-Based Design for Personal Health Information Management Systems
Information
Higher educational institutions in Western Balkan countries strive for continuous development of ... more Higher educational institutions in Western Balkan countries strive for continuous development of their teaching and learning processes. One of the priorities is employing state-of-the-art technology to facilitate experience-based learning, and virtual and augmented reality are two of the most effective solutions to providing the opportunity to practice the acquired theoretical knowledge. This report presents (apart from the theoretical introduction to the issue) an overall picture of the knowledge of AR and VR technology in education in Western Balkan universities. It is based on a semi-structured online questionnaire whose recipients were academic staff and students from universities in Albania, Kosovo, and North Macedonia. The questionnaire differed for each target group; the version for academics comprised 11 questions for 710 respondents, and the version for students comprised 10 questions for 2217 respondents. This paper presents and discusses the results for each question with...
Article An Analysis of the Precision and Reliability of the Leap Motion Sensor and Its Suitability for Static and Dynamic Tracking
www.mdpi.com/journal/sensors
Hybrid Broadcast Broadband Television is a technology platform that combines television and Inter... more Hybrid Broadcast Broadband Television is a technology platform that combines television and Internet services. This work proposes an approach to deliver auxiliary web-based content through broadcast applications bypassing the requirement of Internet connectivity. A complete practical implementation of the solution is provided supporting all technology levels.
Video on demand servers are complex, expensive and inappropriate to be used in low-budget environ... more Video on demand servers are complex, expensive and inappropriate to be used in low-budget environments. This work proposes an approach to use an open source web server and an open source content management system as a video on demand platform for public web purposes. Pseudo-streaming over the hyper text transfer protocol is introduced with the supporting web server features. A practical implementation of the solution is provided with the extensions made to Wordpress content management system.
Tehnicki Vjesnik-technical Gazette, 2016
Original scientific paper The aim of this paper was to get an insight into user’s preferences ove... more Original scientific paper The aim of this paper was to get an insight into user’s preferences over different interactions with mobile ads. In particular, we were interested whether the users prefer swiping or tapping while navigating through a photo gallery. A correlation between the user interface and user engagement (the number of photos viewed) was analysed. A subset of users were also shown a coach notice with an information about how to navigate to examine whether coach notices can improve user experience by reducing usability issues. To answer these questions we developed a tracking system to analyse behaviour of 633 users and performed a survey on 46 people. The results show that swiping is preferable to tapping when navigating through the gallery and that the navigation mode does have an impact on the number of photos viewed. We were also able to show that the presence of a coach notice decreased the number of faulty gestures, but suggested a further work to maximize its pot...
Tehnicki vjesnik - Technical Gazette, 2016
Original scientific paper The aim of this paper was to get an insight into user's preferences ove... more Original scientific paper The aim of this paper was to get an insight into user's preferences over different interactions with mobile ads. In particular, we were interested whether the users prefer swiping or tapping while navigating through a photo gallery. A correlation between the user interface and user engagement (the number of photos viewed) was analysed. A subset of users were also shown a coach notice with an information about how to navigate to examine whether coach notices can improve user experience by reducing usability issues. To answer these questions we developed a tracking system to analyse behaviour of 633 users and performed a survey on 46 people. The results show that swiping is preferable to tapping when navigating through the gallery and that the navigation mode does have an impact on the number of photos viewed. We were also able to show that the presence of a coach notice decreased the number of faulty gestures, but suggested a further work to maximize its potential.
Towards a Personalised and Context-Dependent User Experience in Multimedia and Information Systems
International Series on Computer Entertainment and Media Technology, 2016
Advances in multimedia and information systems have shifted the focus from general content reposi... more Advances in multimedia and information systems have shifted the focus from general content repositories towards personalized systems. Much effort has been put into modeling and integration of affective states with the purpose of improving overall user experience and functionality of the system. In this chapter, we present a multi-modal dataset of users’ emotional and visual (color) responses to music, with accompanying personal and demographic profiles, which may serve as the knowledge basis for such improvement. Results show that emotional mediation of users’ perceptive states can significantly improve user experience in terms of context-dependent personalization in multimedia and information systems.
Users’ viewpoint of usability and user experience testing procedure - gaining methodological insights in a case of an interactive HbbTV application
Multimedia Tools and Applications, 2016
We present a novel meta-methodological approach for the user experience and usability methodology... more We present a novel meta-methodological approach for the user experience and usability methodology procedure evaluation, shown in an example of the user experience and usability study of an interactive HbbTV application. The idea behind this research is not only to evaluate and improve the TV-WEB service but also to gain insights how the participants perceived the whole Ux evaluation procedure itself. The research questions focused mainly on the time complexity (temporal demand) and the frustration level of the TV-WEB evaluation procedure. Additionally the appropriateness of the selected content used, interface and interaction design, and the service impressions and satisfaction/payment related questions was sought. A special questionnaire based on the NASA TLX standard test is presented. The concept has been successfully implemented in several live field trials in three countries (BiH, Serbia and Montenegro). In the user experience and usability study of the service itself more than 150 participants were involved, of those 35 took part in the meta-methodology study. The feedback was quantitatively evaluated on a 7-point Likert scale, with “1” indicating the best positive feedback, “4” neutral/undecided feedback and “7” the most negative feedback. The quantitative average summary results obtained in the three evaluation studies were 1.30 for both the BiH and Serbia test study cases and the score of 1.22 for the test study case in Montenegro. These results show that a great majority of the participants found the whole evaluation procedure time-wise and frustration-wise undemanding, with appropriate content, presentation style and overall attitude towards them. By using this approach it was possible to improve the user experience and usability methodology used, producing more reliable results and providing better user experience in the final version of the product as well as providing a pleasant experience during the testing of the product.
SNE Simulation Notes Europe, 2011
Important features of the K nowledge Manag ement Systems, based on the In formation and Communica... more Important features of the K nowledge Manag ement Systems, based on the In formation and Communication Technologies (ICT) ar e described in the fir st section. These f eatures emphasiz e the import ance of W eb 2.0 concepts whic h f oster user generated con tent dev elopment as well a s ef fective cont ent filt ering a nd selection capabilities (e. g. R eally Simpl e S yndication-R SS f eeds). The mos t pop ular commun ity port als (blog ging, vide o, etc.) now adays g enerate mor e con tent than ev er bef ore. This new par adigm, wher e user s become activ e participants instead of passive observers, calls for improvements in quality assessment and demands the adaptation of user generated content, so that it could be used f or the wider interested audience. On the other hand, corpor ate or academic environments do not benefit fr om the community orien ted W eb 2.0 adv antages dir ectly. K nowledge Management challeng es in th ese en vironments lie in the meaningful and tight integration of the Learning Manag ement Systems (LMS) into the existing knowledge resources and information systems. This enables cr eation of per sonalized learn ing en vironments f or t arget user s, which is described in the second section. Sub sequently, some of the c ase s tudies, which ar e in corporated in to the ECHO Learning Mana gement S ystem at the F aculty of Electric al Engineering, University of Ljubljana, Slov enia, are presented. Conclusions of the paper d escribe future research and development w ork, based on our e xperiences and new learning paradigm, putting learners into the c entre of the educational process.
International Journal of Embedded Systems, 2015
We present an IoT platform designed to support a number of usage scenarios with special emphasis ... more We present an IoT platform designed to support a number of usage scenarios with special emphasis on eHealth use cases. The platform architecture supports procedural and event driven services, as well as extension with additional data importers and visualisation modules and external devices. This broadens the scope of applicability and can support a variety of use cases beyond eHealth, such as home automation and network monitoring. In this paper, two existing eHealth use cases are explained in more detail.
This paper presents a new dataset gathered containing perceived and induced emotions for 200 audi... more This paper presents a new dataset gathered containing perceived and induced emotions for 200 audio clips. The gathered dataset also provides users' association of color for each clip, along with users' demographic and personal data, such as users' emotion state, preferred genres, music experience and daily inference, and others. With an online survey we collected more than 7000 responses for a dataset of 200 audio excerpts, thus providing about 37 user responses per clip. We introduced a new methodology for gathering user perception of emotions in a form of two new interfaces-the MoodGraph and MoodStripe. We present a preliminary evaluation of classifying the present emotions with a regression algorithm on the gathered dataset, and perform a comparison towards other datasets.
We present results of a usability study of new interaction modalities applied to a standard iTV m... more We present results of a usability study of new interaction modalities applied to a standard iTV multimedia platform. To ensure the comparability of results, a functionally identical multimedia user interface based on the open XBMC platform was created. Two interaction study setups were testedone based on a remote-control-based interactive multimedia system and the other on a touch-screen-based system. In the first study setup, a traditional TV remote-control interaction was compared to the interaction using a simplified TV remote controller in combination with voice commands and simple tactile gestures. In the second study setup, interaction using a simplified and an extended set of touch gestures was explored. Both setups were evaluated by an usability study with 14 participants. A standard SUS method was used for usability measurement. By adding other modalities, such as voice commands and tactile gestures, improved the obtained usability score (81.8) when compared to the traditional TV remote-control interaction modality (75.4). The touch-gesture-enabled secondscreen device also improved the user experience (86.1 for a simple set of the touch gestures). Summarizing the results in one sentence,-Less and simpler is more.‖ can be concluded.
A prolonged exposure to stress can lead to mental disorders and psychosomatic diseases, e.g decli... more A prolonged exposure to stress can lead to mental disorders and psychosomatic diseases, e.g declining of health. This survey reviews sensors, human-body parameters and context information correlated with the stress level, and investigates various stress analysis methods. Sensors for stress determination are classified and divided into four groups with regard to the physiological and physical parameters of the human-body, context information, expert assessment and questionnaires. The work to be done in future in the field of stress recognition is discussed.
Description of pilot implementation of telemedicine system in blood transfusion practice
IST Content4All Architecture of a Cross-Media Virtual Community Platform
Abstract The paper is presenting implementation of an opensource cross–media platform for communi... more Abstract The paper is presenting implementation of an opensource cross–media platform for communication and information exchange, developed under the IST Content4All research project. The framework is taking advantage of new distribution methods such as “peer–to–peer” networks, combines them with traditional distribution channels while aiming at creation of virtual communities which meet both individual users' and businesses' needs.
Swiping up/down for mobile gallery navigation: The role of instruction design type
2017 Computing Conference, 2017
The goal of the presented study was to investigate the role of instructions for performing naviga... more The goal of the presented study was to investigate the role of instructions for performing navigation through a mobile photo gallery, which is a common element in rich media mobile advertising. Four different design types — “Always On”, “Animation”, “Icons” and “Interstitial” — were investigated in their ability to instruct smartphone users in implementing a less common — swipe up or down — gesture to browse the photos. Of particular interest were user engagement, assessed by the number of photos viewed, and potential usability issues as indicated by the number of performed faulty gestures, i.e. gestures that were not instructed for navigation, such as swipe left/right or tap. Based on one- and two-way ANOVA results, no statistically significant differences in the abandon rates among different instruction design types were found. Results also showed that the number of faulty gestures was significantly higher when using “Animation” and “Icons” instructions when compared to the other ...
Swiping up/down for mobile gallery navigation: The role of instruction design type
2017 Computing Conference, 2017
The goal of the presented study was to investigate the role of instructions for performing naviga... more The goal of the presented study was to investigate the role of instructions for performing navigation through a mobile photo gallery, which is a common element in rich media mobile advertising. Four different design types — “Always On”, “Animation”, “Icons” and “Interstitial” — were investigated in their ability to instruct smartphone users in implementing a less common — swipe up or down — gesture to browse the photos. Of particular interest were user engagement, assessed by the number of photos viewed, and potential usability issues as indicated by the number of performed faulty gestures, i.e. gestures that were not instructed for navigation, such as swipe left/right or tap. Based on one- and two-way ANOVA results, no statistically significant differences in the abandon rates among different instruction design types were found. Results also showed that the number of faulty gestures was significantly higher when using “Animation” and “Icons” instructions when compared to the other ...
Technology and Health Care, 2019
BACKGROUND: Reduced coordination of precise small movements of the hand, wrist and fingers in Par... more BACKGROUND: Reduced coordination of precise small movements of the hand, wrist and fingers in Parkinson's disease (PD) has been mostly solved by medications and deep brain stimulation. The effects have been evaluated by clinical tests only. Virtual reality based exergaming may enhance fine movements, decrease the medications dosage and provide an additional non-subjective evaluation. METHODS: 3D pick-and-place task (10Cubes) has been developed in a virtual world. The person placed the virtual cubes by the virtual hand, an avatar of the real hand tracked by a Leap Motion Controller (LMC). The system computed the time of manipulating the cube, the total time, the average time, the speed, and the distance. It counted and managed the number of cubes touched, and calculated the hand shake level, i.e. the average tremor index. A pilot test was carried out in a healthy neurologically intact person and a patient with PD using a 3D head-mounted device (HMD) or LCD screen. The results indicate that substantial and also statistically significant (p < 0.05) differences exist between both participants in all objective parameters; the most noteworthy can be the average tremor index. However, we found the parameters only marginally different with 2D equipment. The evaluation system of 10Cubes has proved applicable at an unchanged medication plan, but its clinical effectiveness could be confirmed with a randomized study.
MedReminder-An Interactive Multimedia Medical Application for the IPTV Environment
Information Quality in e- …, 2011
We present the MedReminder, an interactive multimedia medical application, integrated into an exi... more We present the MedReminder, an interactive multimedia medical application, integrated into an existing IPTV service framework. The MedReminder application is implemented within XBMC multimedia platform and is integrated alongside interactive TV live and on demand ...
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Papers by Matevz Pogacnik