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Modern software is developed to work with multiple software and hardware architectures, to cooperate with various peer components and can be installed in many different configurations. In order to test it, all possible working environments needs to be created. This requires software and hardware resources like servers, networks and software licenses and most important: man-hours of qualified engineers...
Publicly available Web search engines suffer from several limitations, which significantly reduce usability in particular cases. The most important limitations are out-of-date information, very simple query language and limited number of results. In many cases, users of the Internet are interested in finding new information which appear in the particular Web portal. In this paper, a system for monitoring...
Advances in web services and open network interfaces enable development of new user-oriented applications in different areas of digital life. Among them, digital entertainment is one of fastest growing networked application domains. Technologies like CDNs (Content Delivery Networks) and HTTP streaming opened the way for new models of TV and video consumption over the Internet. Thanks to emergence...
Many carpool and ride-sharing solutions have been proposed and even developed in the previous decades, but rarely have they been able to attain a global user base, at least not up until recently. That was mostly because many of them were not initially designed as scalable, leaving their users with a sub-par user experiences as their user base grew, and often their mobile or desktop client reach was...
One of the biggest problems facing Web-based Information Systems (WIS) is the complexity of the information searching/retrieval processes, especially the information overload, to distinguish between relevant and irrelevant content. In an attempt to solve this problem, a wide range of techniques based on different areas has been developed and applied to WIS. One of these techniques is the information...
The paper describes architecture of a prototype networked student information delivery system. Main system functionalities include interactive access to lecture room timetables and group messaging. The system exploits modern mobile technologies to allow flexible usage scenarios. The use of open APIs of telecommunications service delivery platforms in combination with e-mail messaging provides diverse...
This article focuses on the performance evaluation of the response time for signalling through a home Internet Protocol based Multimedia Subsystem (IMS), separately for each of IMS core nodes (Proxy-Call Session Control Function, Interrogating-CSCF, Serving-CSCF and Home Subscriber Server) and then on the investigation of the trend-line functions and their equations to describe these delays for various...
The paper presents a prototype radio network aiding the visually impaired to navigate in indoor areas. The main purpose of the system is to provide accurate and reliable location information as well as to enable access to location related context information. The nodes of the network operate in two modes providing basis for both rough and precise user position estimation. The data transmitted by the...
This article presents results of designing a Content Delivery Network monitoring system for resource limited applications. CDN monitoring is important both for content providers (media companies) and administrators (Internet Service Providers). It is a challenging task since network traffic may generate huge volume of data which must be parsed and analysed in real-time. This paper describes the design...
The paper presents a set of mobile applications aiding the visually impaired in using the public transport. A user equipped with a modern smartphone with mobile data transmission and positioning capabilities can access location related context information. Keeping up the connection with dedicated system servers gives the user access to additional services, e.g. enables the use of passenger information...
The aim of this paper is to present a prototype LocNet API programming interface for indoor positioning systems and a prototype LocFusion API interface enabling joint use of terminal positioning data from mobile operator's GMLC and the LocNet API. The use of data from complementary information sources can improve the accuracy of user terminal positioning in large buildings, where coverage of satellite...
One of the more important stages in the development of wireless networks was developing protocols, procedures and systems providing packet data transmission. Packet data transmission enables sending sets of measurement data and other information over long distances, and thus integrating with other available networks, for example the Internet. The aim of this article is to demonstrate the implementation...
Spam detection based on flow-level statistics is a new approach in anti-spam techniques. The approach reduces number of collected data but still can obtain relative good results in a spam detection task. The main problems in the approach are selection of flow-level features that describe spam and detection of discrimination rules. In this work, flow-level model of spam is presented. The model describes...
In this paper we propose an inference based packet recovery technique which considers past scores indicating retransmission success of the peers. Past scores are calculated by considering several parameters such as requested packets availability and round trip time. The importance of packets to be retransmitted is also considered in the proposed model. In order to obtain comparable results, we also...
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