This article describes the architecture and design of an IPTV network monitoring system and some of the use cases it enables. The system is based on distributed agents within IPTV terminal equipment (set-top box), which collect and send the data to a server where it is analyzed and visualized. In the article we explore how large amounts of collected data can be utilized for monitoring the quality of service and user experience in real time, as well as for discovering trends and anomalies over longer periods of time. Furthermore, the data can be enriched using external data sources, providing a deeper understanding of the system by discovering correlations with events outside of the monitored domain. Four supported use cases are described, among them using weather information for explaining away the IPTV quality degradation. The system has been successfully deployed and is in operation at the Slovenian IPTV provider Telekom Slovenije.
COBISS.SI-ID: 9594452
This design-based research study was conducted to identify what importance of a tangible user interface (TUI) can add to teaching and learning. Over a 2-year period, 39 teachers and 145 students participated in the study. The identified problem for investigation was how students, including those with low fine motor skills and those with learning difficulties, develop geometry concepts combining cognitive and physical activity. A didactical application was designed during the first iteration and implemented in inclusive classrooms during the second and third iterations. Qualitative research methods were applied. A relationship between diverse students’ needs and geometry concept learning in relation to computer-supported learning by TUI was discovered. Two dimensions were identified: (1) TUIs support concept development, with physical and virtual representations based on dynamic geometry assisted by TUI; (2) TUI manipulative properties support students who have low motor skills and difficulties in their geometry learning as well as in their inclusion in classroom activities. The study outcomes contributed to the design process of the TUI didactical application and its implementation in inclusive classrooms, and to the body of knowledge in teaching and learning geometry concepts applied for computer-assisted learning environments supported by TUI.
COBISS.SI-ID: 9276500
A systematic approach to configurable functional verification of electronic devices is presented. Based on a black box approach, it can be applied to any design where behavior can be expressed by a set of functions. The approach uses Transaction Level modeling to raise the abstraction level, providing faster verification. The approach is demonstrated on two case-studies; a video-processing block and unit and universal serial bus host controller.
COBISS.SI-ID: 9324116
Stressors encountered in daily life may play an important role in personal well-being. Chronic stress can have a serious long-term impact on our physical as well as our psychological health, due to ongoing increased levels of the chemicals released in the ‘fight or flight’ response. The currently available stress assessment methods are usually not suitable for daily chronic stress measurement. The paper presents a context-aware chronic stress recognition system that addresses this problem. The proposed system obtains contextual data from various mobile sensors and other external sources in order to calculate the impact of ongoing stress. By identifying and visualizing ongoing stress situations of an individual user, he/she is able to modify his/her behavior in order to successfully avoid them. Clinical evaluation of the proposed methodology has been made in parallel by using electrodermal activity sensor. To the best of our knowledge, the system presented herein is the first one that enables recognition of chronic stress situations on the basis of user context.
COBISS.SI-ID: 9534292
We report a phenomenon based on an apparent photoconversion of DAPI that results in detection of a DAPI signal using a standard filter set for detection of green emission due to blue excitation. When a sample stained with DAPI only was first imaged with the green filter set (FITC/GFP), only a weak cytoplasmic autofluorescence was observed. Next, we imaged the sample with a DAPI filter set, obtaining a strong nuclear DAPI signal as expected. Upon reimaging the same samples with a FITC/GFP filter set, robust nuclear fluorescence was observed. We conclude that excitation with UV results in a photoconversion of DAPI that leads to detection of DAPI due to excitation and emission in the FITC/GFP channel.
COBISS.SI-ID: 30233561