In case of modern dynamic and interactive multimedia-rich services the importance of achieved Quality of Experience (QoE) equals or exceeds importance of Quality of Service (QoS). The paper presents results of detailed analysis on QoE and QoS profiling on all communication layers and presents modelling and simulations of QoE in NGN network using IMS, RACS and NASS subsystems. Presented models are based exclusively on existent profiles, functionalities, procedures and protocols available in an NGN.
COBISS.SI-ID: 7862612
State-of-the-art content-based recommender systems usually rely on data-centric metadata (e.g. genre, actors ...). We introduced a set of user-centric metadata that describe the users' emotive responses. We compared the accuracy of recommended items in a content-based recommender system for images using (i) generic, data-centric, metadata and (ii) affective, user-centric, metadata. The results have shown that the recommender system with affective metadata yields significantly better accuracy than the same system with generic metadata.
COBISS.SI-ID: 7907412
The main goal of our research was to measure the influence of the network delay on a subjective QoE assessment, while interacting with some frequently used HASS tasks. The results show that users are satisfied if the delay is kept below 0.8 seconds, and that they can tolerate delays of over two seconds (depending on the level of the HASS task interactivity). Since such a user-perceived subjective QoE assessment is both time-consuming and expensive we also propose objective QoE assessment models to represent the influence of network delay on a subjective QoE assessment for various HASS tasks.
COBISS.SI-ID: 24277031
Two novel solutions that overcome multihoming issues regarding default routing with the use of NAT/firewall NSIS signalling layer protocol (NATFW NSLP) are introduced. Proposed solution can realize an immediate failover if a fatal error occurs at a traversed middlebox, and offer disjoint network paths for possible bandwidth aggregation. These advanced features are of vital importance for dynamic end-to-end resource availability and satisfactory service quality for clients with heterogeneous access technologies.
COBISS.SI-ID: 7960404
This paper describes the prototype of a system which enables the spatial positioning of synthesized speech relatively to the listener. Based on the proposed system we developed an application which reads an arbitrary text from a file and enables the use of different synthesized voices with changeable pitch and speaking rate as well as the manipulation of their spatial position .A user study with blind users showed a significant improvement of listening comprehension due to easier separation of spatially distributed speakers.
COBISS.SI-ID: 8093012