Although wireless sensor networks (WSN) are mainly designed for gathering information and measuring environmental parameters, they can be effectively used to control and manage the electrical devices in the house. Thus, they become part of an intelligent and autonomous environments that can take part of the obligation of the tenant in the house. By combining the WSN with other networks such as the Internet or mobile phone network, ZigBee networks receive full functionality and the ability of remote monitoring and control. This paper describes an example of the design of wireless networks with Xbee module and its application in home use. The achieved tasks of the network that was implemented through this paper are: measuring the temperature of home area, automatic and manual control of individual actuator nodes and ZigBee network connectivity with other networks, storage and graphical representation of measured values.

This paper presents the importance of application and integration of learning styles in adaptive educational hypermedia systems - AEHS. The main goal of the paper is a comparative analysis of the data obtained from the initial questionnaire based on Felder-Silverman learning style model and the data from the user model and domain model of our AEHS system TeleEDUCOS. Results of the analysis indicate the correspondence of these two approaches, which leads to conclusion that information about the users' learning styles should be taken into account when designing AEHS systems with the aim of improving efficiency in adapting and presenting of educational material to the users as well as the effectiveness of the learning process supported by AEHS system.

In the last years measuring functional size of software applications became one of the most popular methods when there is need for creating models for effort, costs and budget estimation in software development. Functional Size Measurement (FSM) methods quantify the software from its user's perspective, disregarding quality and technical criteria. In context of conceptual models where models represent application at higher level of abstraction, functional size of developed software application can be measured on the basis of conceptual model and requirements analysis. Requirements analysis is usually conducted thru usage of use case, sequence, activity and other UML diagrams. In this work, we have investigated possibility of using COSMIC FSM method for functional size estimation of web applications whose basic model is created using UML-based Web Engineering (UWE) approach. An example of developed web application with UWE requirements model used for COSMIC measurement is presented and discussed.

The age of modern technologies brings rapid changes in all aspects of human life and in education as well. eLearning is became universal brand, trade mark for innovative approach to learning process of new students generation. Today, for implementation of eLearning are in usage a new various technologies, mostly practical implementations. Two very popular technologies for production and delivery of digital media at the universities are streaming media and digital signage technology. In this paper, a system that integrates streaming media and digital signage technology has been designed and implemented. System allows production, management and distribution of video-based multimedia educational content in the way of streaming video and digital signage content, combined with advertising and notifying. Such system can be used on faculties or universities, providing an efficient and effective way of distribution advertising alongside with lecture-related content.

The channelisation codes used in Universal Mobile Telecommunications System (UMTS) belong to the family of OVSF codes. They are organised according to a code tree structure. OVSF codes are primarily used to preserve orthogonality between different channels. The 3G system has to provide applications with higher and multirate and different quality of service (QoS) requirements. UMTS networks employ wide-band code division multiple access (WCDMA) to support multirate applications utilizing OVSF codes. The transmission rate can be easily changed by changing the spreading factor of orthogonal spreading code. The objective of code assignment is to enhance statistical multiplexing and spectral efficiency of WCDMA systems supporting variable user data rates. This paper compares the performance of OVSF code assignment schemes, in terms of code blocking probability. We analyze the problem of assigning OVSF codes at download link in 3G mobile communications systems employing WCDMA.

3G networks are designed to provide voice, data and multimedia services in an efficient way. The 3G system has to provide all of these applications with higher and multirate and different quality of service (QoS) requirements. UMTS employs wide-band code division multiple access (WCDMA) to support multi-rate applications utilizing OVSF codes. The transmission rate can be easily changed by changing the spreading factor of orthogonal spreading code. The objective of code assignment is to enhance statistical multiplexing and spectral efficiency of W-CDMA systems supporting variable user data rates. This paper compares the performance of OVSF code assignment schemes, in terms of code blocking probability. We research the problem of assigning orthogonal variable spreading factor (OVSF) codes at the download link in 3G mobile communications systems employing WCDMA.

As radio resources that belong to a GSM/GPRS network are limited, then there is a need for a more efficient use of available resources. This work gives guidelines for estimation of essential resources in GSM/GPRS network with downlink throughput as QoS attribute. Also, this work indicates advantages and disadvantages of certain engineering traffic methods in GSM/GPRS networks. Concretely, it is about the methods with a fix allocation of channels, on-demand allocation and the possibility of applying both methods together. Instead of GPRSim (1,2) we used network simulator ns2. According to the measured throughput, the number of users (MS) determines a work point and more over, the optimal number of channels and TRX units.

Rad razmatra primjenu genetickih algoritama prilikom analize paralelnog procesiranja poziva i usluga. Dat je teorijski model distribuiranih sustava s