Author Archives: Bojan Blažica

Towards the improvement of GUARD graphical user interface

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Žiga Kopušar
Guardiaris d.o.o., Podjunska ulica 13, Ljubljana, Slovenia
Franc Novak
Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia

Abstract: In this paper, we describe a case study of usability testing of the GUARD Control Desk graphical user interface, which is a part of the GUARD simulator and is used for exercise planning, execution and evaluation in soldier training. The usability testing was performed in the development phase of a new version of user interface.

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Wizard of Oz experiment for Prototyping Multimodal Interfaces in Virtual Reality

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Blaž Gombač, Matej Zemljak, Patrik Širol, Damir Deželjin, Klen Čopič Pucihar, Matjaž Kljun
University of Primorska, FAMNIT, Glagoljaška 8, Koper, Slovenia

Abstract: In recent years the field of virtual reality has witnessed a rapid growth with significant investments in both hardware and software development. It has several potential applications for entertainment, education and enterprise where users benefit from being immersed into virtual worlds. VR headsets are available in several forms and price ranges from simple and inexpensive Google Cardboard to more complex products such as Oculus Rift. Nevertheless, designing fully operational virtual reality applications for researching new complex multimodal interaction possibilities (e.g. mid-air gesture, voice, haptics, etc.) may be difficult to implement, costly and time consuming. For this reason we have looked into ways of rapidly prototyping virtual reality interactions. Our approach consists of the Wizard of Oz experiment in which subjects interact with a computer system believing to be autonomous, but is in reality operated by researchers. The presented system allows non-technical designers to explore various multimodal interactions with rapid prototyping of VR environments.

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Evaluation of common input devices for web browsing: mouse vs touchpad vs touchscreen

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Andrej Maleckar, Matjaž Kljun, Peter Rogelj, Klen Čopič Pucihar
University of Primorska, FAMNIT, Glagoljaška 8, Koper, Slovenia

Abstract: With the ever increasing connectivity to the Internet the use of the web has spread from static environments of desktop computers to mobile context where we interact with the web though laptop computers, tablet computers, mobile phones and wearable devices. Recent studies have shown that young people access the web using various devices and input techniques and spend on average more than 20 hours a week on the web. In this paper we plan to investigate which input technology is most usable or preferred for performing different tasks on the web. We decided to compare and evaluate the usability of the three most used input devices for web browsing, namely: a computer mouse and a touchpad on a laptop, and a touchscreen on a smartphone. For this purpose we have built a custom web page where users had to perform seven common tasks on web: open a URL address, copy/paste a URL address, copy/paste text, scroll up-down, scroll left-right, zoom in the context of a web page, and navigate a map. The results show that the mouse is still a preferred input device with shortest completion times, followed by the touchscreen interface even if it performed slower at some tasks compared to touchpad, which was marked as least preferred.

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Improving the usability of online usability surveys with an interactive Stripe scale

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Matevž Pesek, Alja Isakovic, Gregor Strle, Matija Marolt
University of Ljubljana, Faculty of Computer and Information Science, Laboratory for Computer graphics and Multimedia, Večna Pot 113, 1000 Ljubljana, Slovenia

Abstract: The paper introduces Stripe, an interactive continuous scale for online surveys that makes it easy to compare multiple answers on a single screen. The Stripe is evaluated as an alternative to the n-point Likert scale, which is commonly used in online usability questionnaires like the System Usability Scale (SUS). The paper presents the results of a user study, which confirmed the validity of results gained with the proposed Stripe interface by applying both the Stripe and the Likert interface to an online SUS questionnaire. Additionally, the results of our study show that the participants favor the Stripe interface in terms of intuitiveness and ease of use, and even perceive the Stripe interface as less time consuming than the standard Likert scaled interface based on radio buttons.

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Redesign of Slovenian Avalanche Bulletin

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Vanja Blažica, Janez Jaka Cerar, Aleš Poredoš
Slovenian Environment Agency, Vojkova 1b, 1000 Ljubljana, Slovenia

Abstract: We present the redesign of the Slovenian avalanche bulletin, published regularly during the winter season to warn against avalanche danger and to provide specific information for advanced users. The former version included an estimation of danger on a scale from one to five with supporting text for the whole country, while the new one offers an additional graphical description, specified for several geographical regions. The redesign profoundly influenced the work of avalanche forecasters by introducing a new interface, additional input and database storage. At the same time, users welcomed the additional information, international comparability and user friendliness of the new bulletin.

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Designing visual interface for nutrition tracking of patients with Parkinson’s disease

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Peter Novak, Barbara Koroušić Seljak, Franc Novak
Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia

Abstract: In this paper, we describe the design of a visual interface of a mobile a mobile app for tracking nutrients and foods consumed by patients with Parkinson’s disease. The interface should enable the patients to recognize objects on the screen, easily perceive their function and interact with them thus providing an efficient way of entering the dietary intake data. The app has been validated by five patients and the preliminary results are encouraging.

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3D serious games for Parkinson’s disease management

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Bojan Blažica, Franc Novak, Anton Biasizzo
Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Ciril Bohak
Faculty for Computer and Information Science, University of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia

Abstract: The aim of the article is to show how off-the-shelve equipment can be used to develop serious games for an affordable tele-medicine solution for Parkinson’s disease management. Two games have been developed aimed at assessing and training patient’s reach of upper limbs (using Kinect v2) and fine motoric skills of fingers (using Leap motion). The games collect player data in terms of score achieved and full kinematics of movement during gameplay. The data is stored online and made available to therapists and doctors through a secure connection. The games have been tested with patients within the Soča rehabilitation institute as well as at their homes.

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Remote Interaction in Web-Based Medical Visual Application

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Ciril Bohak, Primož Lavrič, Matija Marolt
Faculty for Computer and Information Science, University of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia

Abstract: In this paper we present a novel integration of four remote collaboration modalities into an existing web-based medical data visualization framework: (1) visualization data haring, (2) camera view sharing, (3) data annotation haring and (4) chat. The integration of remote collaboration modalities was done for two reasons: for getting the second opinion on diagnosis or for getting a diagnosis from the remote medical specialist. We present an integration of these modalities and a preliminary evaluation by the medical expert. In conclusion we show that we are on the correct track of integrating collaboration modalities into the visualization framework.

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HCI-IS 2016 Schedule

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Part 1 (14.00 – 16.00)

  • 14.00 – 14.15 – Opening event
  • 14.15 – 14.30 – Remote Interaction in Web-Based Medical Visual Application (Ciril Bohak, Primož Lavrič, Matija Marolt)
  • 14.30 – 14.45 – 3D serious games for Parkinson’s disease management (Bojan Blažica, Franc Novak, Anton Biasizzo, Ciril Bohak)
  • 14.45 – 15.00 – Designing visual interface for nutrition tracking of patients with Parkinson’s disease (Peter Novak, Barbara Koroušić Seljak, Franc Novak)
  • 15.00 – 15.15 – Short break
  • 15.15 – 15.30 – Redesign of Slovenian Avalanche Bulletin (Vanja Blažica, Janez Jaka Cerar, Aleš Poredoš)
  • 15.30 – 15.45 – Improving the usability of online usability surveys with an interactive Stripe scale (Matevž Pesek, Alja Isakovič, Gregor Strle, Matija Marolt)
  • 15.45 – 16.00 – Evaluation of common input devices for web browsing: mouse vs touchpad vs. touchscreen (Andrej Malečkar, Matjaž Kljun, Klen Čopič Pucihar, Peter Rogelj)

Coffee break (16.00 – 16.30)

Part 2 (16.00 – 17.45)

  • 16.30 – 16.45 – Wizard of Oz experiment for Prototyping Multimodal Interfaces in Virtual Reality (Blaž Gombač, Damir Deželjin, Matej Zemljak, Klen Čopič Pucihar, Patrik Širol, Matjaž Kljun)
  • 16.45 – 17.00 – Towards the improvement of GUARD graphical user interface (Žiga Kopušar, Franc Novak)
  • 17.00 – 17.15 – Towards affordable Mobile Crowd Sensing device (Gal Pavlin, Marko Pavlin)
  • 17.15 – 17.30 – I was here: a system for creating augmented reality digital graffiti in public place (Erik Šimer, Matjaž Kljun, Klen Čipič Pucihar)
  • 17.30 – 17.45 – Interactive Video Management by means of an Exercise Bike (Jan Štrekelj, Branko Kavšek)

Conference closing