Search results for "VDP::Matematikk og naturvitenskap: 400"
showing 10 items of 647 documents
Quality of service (QoS) in mobile ad hoc networks
2006
Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, Grimstad Mobile ad hoc networks inherits several of the issues that ordinary wireless networks have and include several new ones. With internet becoming a multi media enviroment, there are many new requirements that must be satisfied, especially when it comes to real time service. Quality of servce protocol for MANETs has been a topic of interest. In this paper I propose a QoS –aware bandwidth protocol based on available bandwidth calculation. My proposal is based on a few existing proposals today and the theory around these. I then show an implementation available bandwidth calculation and routing functions.…
QoS for real-time IP traffic
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad This thesis focuses on three service models, known as Best Effort, IntServ and DiffServ, and their ability of providing QoS in IP networks. The objective is to evaluate the performance of real-time traffic based on theory and testing. In addition, mechanisms that may improve the QoS performance further, like MPLS and Bandwidth Brokers, are evaluated to find a comprehensive solution for different types of IP networks. Tests are set up to focus on typical behavior of the service models, and disclose differences in their efficiency together with problems concerning fairness in the bandwidth sharing. Res…
Migration of VOIP/SIP enterprise solutions towards IMS
2006
Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, Grimstad Voice-over-IP solutions based on SIP and Skype are now widely spread and accepted by end-users. "Traditional Circuit Switched" voice services suffer from declining revenues, high maintenance cost, and a lack of integration with Internet applications. For an enterprise customer it is increasingly difficult to make a decision about which VoIP solution to select. For fixed and mobile operators new solutions based on IMS are on the horizon, and investment strategies for VOIP solutions are difficult. The research project will investigate VoIP/SIP solutions based on open source as a starting point, and out…
Gateway security between Bluetooth and GSM/GPRS
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad The amount of wireless technologies is getting bigger and wider. It is more and more common in everyday use for a huge amount of the people. A cellular phone is something that everyone got in addition to normal access the Internet. So, why not both at the same time. When data is transmitted over the Internet and are communicating with wireless technologies, there are several vulnerable points. There have to be secure data communication, and the security is only something that should lay behind which people do not have to think about. Unfortunately, this is not the way it is, there are different techn…
Personal firewall in mobile phone
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad The assignment described in this master thesis is given by Ericsson AS and gives an evaluation of a need for a personal firewall in mobile phone. In today’s commercial products personal firewall in mobile phone does not exist. This master thesis analyzes the role of personal firewall in different scenarios. At the beginning of the master thesis functions that already exist in personal firewall for PC were discussed in the sense of which could be useful in personal firewall for mobile phone. This master thesis also covers description of connection between personal firewall and virus in addition to wha…
Formation of secure wireless ad-hoc sensor networks
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Looking into the wireless world today, the most of data/information is transmitted in plaintext over the ether. These sensitive data/information possibly route through several intermediate nodes to a destination. To secure the sensitive data/information, the various ad-hoc technologies like Bluetooth, WLAN and ZigBee have implemented different security mechanisms and routing protocols. But since most wireless ad-hoc networks demand battery driven devices they will have limit resources to provide feasible security. The different technologies will be outlined regarding a set case scenario. We have a pa…
WLAN-GPRS interworking
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad During the last years it has been experienced a huge growth in Internet users. Nearly each household in Norway got a computer attached to the Internet. The trend for further growth seems to be within the concept of mobile Internet, which means that the user can be attached anywhere at any time. The sales of mobile equipments like personal digital assistants (PDAs) and laptops are currently experiencing a great growth. This indicates a need for greater flexibility and mobility and gives therefore a demand for mobile Internet. The motive for this thesis was to investigate the opportunities to offer mob…
Wavelet-based video compression: A glimpse of the future?
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Even though wavelet-based video compression has been an area of research for more than a decade, motion estimation and compensation has been considered complex and inefficient until recently. We have carried out a thorough investigation of existing research work in this field, and found that fundamental problem with wavelet-based temporal removal while obtaining highly scalability (the wavelet-properties of multiresolution structure in combination with embedded coding), has been solved by performing motion compensated temporal filtering within the wavelet domain of a overcomplete three-dimensional li…
Analysis of binarization techniques and Tsetlin machine architectures targeting image classification
2020
Master's thesis in Information- and communication technology (IKT590) The Tsetlin Machine is a constantly evolving and developing machine learning technique with ever-increasing success. However, for every success, the Tsetlin Machine achieves, a new set of challenges are put ahead. To sufficiently bring the Tsetlin Machine to a broadly used standard, these challenges must be completed. This thesis focuses on the challenge of doing color image classification and will provide an introductory description of how this is possible through the usage of an older technique, namely binarization. A comparison with the various Tsetlin Machine adaptations made public in recent times is also present aft…
An improved image processing chain for mobile terminals
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad Based on the proposal in the report by Tryggve Mikkelsen [Mikkelsen, 2001] this thesis investigates and discusses the implementation of a simplified image processing chain for modern mobile terminals. Previous work on image processing in this field of application has shown that the demosaicing operation, color space conversion and downsampling are resource demanding pre-processing operations. The simplification potential of the signal chain lies within the pictured scenario of using Bayer RGB from the image sensor directly as input to the compression scheme. By omitting these pre-processing operation…