Search results for " Systeme"
showing 10 items of 111 documents
A conceptual model of feedback mechanisms in adjusted affordances – Insights from usage of a mental mobile health application
2023
Affordance theory provides one of the most prominent lenses through which the socio-technical aspects of a system’s use can be investigated and understood. In this context, the literature has proposed that perceived and actualized affordances may be adjusted over time. Yet, how the adjustment of affordances occurs has not been explained in detail. Thus, in this article, we develop a conceptual model of feedback mechanisms that includes a more explicit description of how affordances are perceived by users, whether actualized and adjusted. With the model, we introduce the central concept of a generative base, out of which affordance perceptions emerge and which can be updated through affordan…
Forecasting : theory and practice
2022
Forecasting has always been at the forefront of decision making and planning. The uncertainty that surrounds the future is both exciting and challenging, with individuals and organisations seeking to minimise risks and maximise utilities. The large number of forecasting applications calls for a diverse set of forecasting methods to tackle real-life challenges. This article provides a non-systematic review of the theory and the practice of forecasting. We provide an overview of a wide range of theoretical, state-of-the-art models, methods, principles, and approaches to prepare, produce, organise, and evaluate forecasts. We then demonstrate how such theoretical concepts are applied in a varie…
Feasibility analysis for forecasting inflow of unplanned work using machine learning techniques
2021
Master´s thesis in Information and Communication Technology (IKT590), University of Agder, Grimstad
Evaluation of IP over Bluetooth
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad The increasing use of Wireless technologies suggest that this kind of technology has a bright future. Today the most popular Wireless Local Area Networks are WLAN 802.11 and Bluetooth. They both have their strengths in different environments. Bluetooth was not initially an Internet technology, but over the years the focus on implementing Bluetooth nodes with Internet capability has increased. When we want to run IP over Bluetooth we need some kind of gateway to the Internet from Bluetooth, a network access point. This will be an important device in the thesis. The Bluetooth Special Interest Group has…
IPv6 : prospects and problems : a technical and management investigation into the deployment of IPv6
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad IPv4 has been used for over twenty years, and will most likely be used in many years ahead. However, we are now experiencing that the IPv4 address space is running out, resulting in restrictions on who will be able to get these types of addresses assigned to them. Methods such as Network Address Translator (NAT) have been developed and implemented in order to save the IPv4 address space. It is said that this is not a good enough solution, as such techniques introduce new problems at the same time solving some. A new version of the Internet Protocol, IPv6, has been developed and is likely to replace I…
Study and performance evaluation of transport layer protocols over heterogeneous radio and satellite networks
2006
Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, Grimstad Satellites have for some years made it possible to transfer data over long distances, and from desolated locations. Due to their natural broadcast ability they have some major advantages compared to terrestrial links. This ability has made satellites a useful tool for military, science, multimedia and wireless communication. Compared to a few years ago, we are today able to make more accurate measurements, in different environments. Sensors have recent years become more intelligent, and can work independently without being controlled by humans or computers. Other improvements are their mobility, and …
Mechanisms for OAM on MPLS in large IP backbone networks
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad The telecom industry has an ongoing work on the Operation and Maintenance (OAM) mechanisms for the MultiProtocol Label Switching (MPLS) technology. We are expecting that this technology will be the future platform for sending Internet Protocol (IP) packets through the backbone networks. OAM functionalities that exist or are proposed for MPLS are: Reachability and failure detection, avoidance of congested routers, Simple Network Management Protocol (SNMP) features, fast rerouting functions, traffic engineering and ad-hoc mechanisms like Ping. Our work shows that through a comparison of OAM mechanisms …
SIP based IP-telephony network security analysis
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad This thesis evaluates the SIP Protocol implementation used in the Voice over IP (VoIP) solution at the fibre/DSL network of Èlla Kommunikasjon AS. The evaluation focuses on security in the telephony service, and is performed from the perspective of an attacker trying to find weaknesses in the network. For each type of attempt by the malicious attacker, we examined the security level and possible solutions to flaws in the system. The conclusion of this analysis is that the VoIP service is exploitable, and that serious improvements are needed to achieve a satisfying level of security for the system.
Security in GPRS
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad GPRS offers the user an “always on” connection to Internet and Intranet. Some of the services may require high level of security. This can be financial transaction over the Internet, or exchange of confidential documents from a company’s Intranet to an employee. It is important to have strong focus on the security, so companies and persons that demand high level of security can take advantage of the services GPRS offered. What normally happens is that the services wins against the security. This is in most cases adequate security for what a normal subscriber requires. This thesis covers which securit…
Feasibility study of VoIP in 3GPP UMTS release 5 interworking with fixed networks
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad The Universal Mobile Telecommunications System (UMTS) is denoted as a 3rd generation cellular system and has been designed with the objective to be a system with global coverage. With improvement of bandwidth capabilities, the UMTS system has the ability to support real time multimedia services. The focus in this thesis is Voice over IP (VoIP) which enables a user to make phone calls in the packet switched network in UMTS. This thesis starts with a presentation of VoIP with the quality requirements related to a voice session. A voice conversation needs a guaranteed quality to satisfy the participants…