<p>DARC is a technique for data broadcasting over the FM radio network. Sectra Wireless Technologies AB has developed a handheld DARC receiver known as the Sectra CitySurfer. The CitySurfer is equipped with a high-resolution display along with buttons and a joystick that allows the user to view and navigate through various types of information received over DARC. </p><p>Sectra Wireless Technologies AB has, among other services, also developed a paging system that enables personal message transmission over DARC. The background of this thesis is a wish to be able to send fax documents using the paging system and to be able to view received fax documents in the CitySurfer. </p><p>The presented solution is a central PC-based fax server. The fax server is responsible for receiving standard fax transmissions and converting the fax documents before redirecting them to the right receiver in the DARC network. The topics discussed in this thesis are fax document routing, fax document conversion and fax server system design.</p>

<p>This thesis was performed at the research centre CINECA in Bologna, Italy. An interface with six degrees of freedom, 6DOF, to be used in a virtual environ- ment for the positioning of medical components was developed in co-operation with IOR, one of the most important orthopaedic hospitals in Italy. The main reason for doing this was to find out whether or not a virtual en-viron-ment and 6DOF interaction could make the pre-operative planning of an ope-ration more efficient compared to other techniques. Is it easy to posi-tion an object using stereovision and a 6DOF tracker tool? Further-more, the interface might also be used in other applications and areas in the future. </p><p>Described is the development of an interaction class especially constructed for the use of a tracking tool called a stylus pen. This tool takes advantage of all 6DOF, i.e. it recognises movements in the x, y and z directions and likewise the orientation of the tool around the three axis. Moreover, an application which uses the interaction class was created in order to evaluate its usefulness. The application enables the user to load, save and position objects within a virtual environment. The result of this evaluation is then described and discussed. </p><p>In the evaluations it was shown that the stylus pen with 6DOF is an intuitive in-ter-action tool which works well for positioning. The stereovision also seems to further improve the users ability to position objects. However, the created interaction class needs to be further developed before itcan be implemented in a pre-operative planning tool.</p>

<p>Syfte </p><p>Detta examensarbete gjordes för att försöka underlätta och förbättra arbetet med gråbalansstyrning vid dagstidningstryck. Punkter som ingår:</p><p>- Hur väl går det att mäta med densitometer på gråbalansfälten, och vad kan påverka dess mätvärden? </p><p>- Går det att hitta några riktlinjer för hur mätvärden, som erhålls från densitometern, skall förhålla sig till varandra? </p><p>- Hur små kan gråbalansfälten vara och ändå vara tillförlitliga att arbeta med visuellt? </p><p>- Hur förhåller sig konventionellt raster till stokastiskt raster? </p><p>Resultat </p><p>Vad gäller val av gråbalanston kan rekommenderas att använda någon av de fyra mellantoner, som ingick i undersökningen. Den allra ljusaste tonen i testerna är väldigt svår att läsa av visuellt, och vid mätning med densitometer är den inte tillräckligt känslig för variationer i fulltonsdensiteterna och punktareorna.Den allra mörkaste tonen är den som är enklast att läsa av visuellt i små fält, men vid mätning ger den väldigt spridda och oregelbundna mätvärden. </p><p>Vid mätning med densitometer är konventionellt raster stabilare än stokastiskt raster. Stokastiskt raster ger lite högre mätvärden, än vad det konventionella rastret gör, då båda metoderna har samma rastertonvärden för de ingående tryckfärgerna. Vid visuell bedömning har rastermetoderna olika fördelar. För konventionellt raster är det lättare att identifiera små densitetsavvikelser, medan stokastiskt raster är lättare att avläsa på väldigt små fält, då avvikelsen på fulltonsdensiteten ligger på +/- 0,1 D. </p><p>Placeringen på sidan spelar en stor roll när det gäller mätning med densitometer. Det allra viktigaste är att inte placera gråbalkarna så att de trycks bakom varandra på varsin sida av pappret. Detta påverkar mätningsresultatet relativt mycket. Även val av placering i tryckriktningen påverkar mätningar. Det gick att se klara tendenser på förändring i punktarean, genom att den ökade längs tryckriktningen. Denna förändring i punktarean påverkade mätvärdet. </p><p>Vid mätning med densitometer på ett CMY-fält, tryckt med konventionellt raster, ska C och M ge samma värde, medan Y skall ligga ungefär 0,01 mätenhet högre. För att K-fältet ska vara så likt CMY-fältet som möjligt, bör dess K-värde ligga 0,02 mätenheter över värdet för C i CMY-fältet. Det inbördes förhållandet mellan C-, M- och Y-värdena i CMY-fälten är vid stokastiskt raster svårare att bestämma. De ligger dock nära varandra i de flesta toner. Som referensmätvärde för C kan sägas att det bör ligga något under tonvärdet för cyan, vid konventionellt raster. När stokastiskt raster används bör detta värde ligga något över tonvärdet för cyan.</p>

There exist several known methods for calculation of radio coverage for ground-based systems. As far as we know there are no equivalent methods for the case of flying platforms when the altitudes and speeds are significantly different to those of ground-based systems. This thesis describes the theoretical concepts behind calculations of radio coverage for flying platforms. An investigation is made to sort out what is important and possible to employ in a model for simulations. A method is described and implemented in a program for evaluation of flying radio systems. Two typical cases of flight missions are simulated and discussed. It is found that the free space model is valid most of the mission time. The contribution from the antennas is found to be small in comparison to the path loss. Further investigations suggested are e.g. better ground reflection models and a better model for the flight mechanics.

The size and complexity of local area and wide area networks are continually growing and so do the requirements of high availability. Today we rely on the technology and it should always work. Network management is therefore getting more and more important. Network management includes: monitoring and isolating faults, measuring performance, configuring the resources, making sure the network is secured and more. Since in the early 1990s the management has typically been done with SNMPv1 or CMIP and using the client/server model. SNMPv1 is insecure, CMIP is complex and the traditional centralized paradigm is no longer sufficient to handle the management requirements of large networks. As the demands for security and flexibility increases, new ways to manage networks are needed. This research tries to find out how a network management system should function, what management protocol to use, how to enhance the flexibility and how to make the system more secure.

To take advantage of the high speed in an optic fiber, one of the basic concept in fiber optic communication is to allow several users to simultaneously transmit data over the channel. One technique that provides multiple access is it fiber optic-code division multiple access (FO-CDMA). In FO-CDMA each user is assigned one or more signature sequences called codewords, which are subsets of a type of optical orthogonal code (OOC). The channel input/output consists of the superposition of several users codewords and at the receiver end an optical correlator extracts the information. In the parallel code constructions, presented in this report, each user j is assigned a subset Cj from a code C. The subsets are disjoint and their union is the whole set C. A new way to map the information bits is to insert up to L zeros before each codeword from Cj and let this represent information aswell. This gives high rates for active users but an investigation is needed to ensure that this does not compromise the systems wanted property of sending information with a small probability of errors for all users. Therefore a simulation environment has been implemented in Matlab. The result from these simulations shows that BER for the L parallel codes is acceptable and not much higher than for the traditional constructions. Because of the higher rate these construction should be preferred but an analysis if a hardware implementation is possible.

A numerical simulation case involving space plasma and the evolution of instabilities that generates very fast electrons, i.e. approximately at half of the speed of light, is used as a test bed for scientific visualisation techniques. A visualisation system was developed to provide interactive real-time animation and visualisation of the simulation results. The work focuses on two themes and the integration of them. The first theme is the storage and management of the large data sets produced. The second theme deals with how the Visualisation System and Visual Objects are tailored to efficiently visualise the data at hand. The integration of the themes has resulted in an interactive real-time animation and visualisation system which constitutes a very powerful tool for analysis and understanding of the plasma physics processes. The visualisations contained in this work have spawned many new possible research projects and provided insight into previously not fully understood plasma physics phenomena.

This thesis describes a system for dealing with free surface fluid simulations, and the components needed in order to construct such a system. It builds upon recent research, but in a computer graphics context the amount of available literature is limited and difficult to implement. Because of this, the text aims at providing a solid foundation of the mathematics needed, at explaining in greater detail the steps needed to solve the problem, and lastly at improving some aspects of the animation process as it has been described in earlier works. The aim of the system itself is to provide visually plausible renditions of animated fluids in three dimensions in a manner that allows it to be usable in a visual effects production context. The novel features described include a generalized interaction layer providing greater control to artists, a new way of dealing with moving objects that interact with the fluid and a method for adding source and drain capabilities.

Användandet av strömmande medier har ökat explosionsartat under de senaste åren. Oavsett om det sker märkbart för användaren eller inte använder sig gemene man i princip dagligen av någon form av tjänst som distribueras via strömmande medier över Internet. Det kan röra sig om allt från att lyssna på webbradio till att titta på videoklipp från nyhetsportaler eller sportsidor på Internet. I denna rapports första del görs en kartläggning över strömmande medier rent generellt. Den läsekrets som inte är särskilt insatt i ämnet får reda på vad strömmande medier är, vilka aktörer som finns på marknaden, möjliga distributionssätt, historik med mera. Fortsättningsvis kommer rapporten att behandla hur införandet av strömmande medier går till i teorin: hur distributionskedjan ser ut, vilka krav som konsument och producent ställer och hur man försöker att lösa problem som uppstår. Det senare leder vidare till en genomgång av bland annat streamingprotokoll, bredbandstekniker och komprimeringsstandarder för ljud och bild. I rapportens senare del ges exempel på hur strömmande medier införs i praktiken. Här läggs speciellt fokus på användningsområdet sport och direktsändningar av sportevenemang. Konkreta exempel beskrivs och vi får även reda på hur det går till att genomföra en direktsänd sportsändning via strömmande medier. Som avslutning diskuteras tänkbara framtidscenarion och en utredning av en unikInternetsändning av en elitishockeymatch görs.

The aim of this thesis project is to create a user interface for a web based film production project management portal. This implies creating a site map and a functionality specification based on the needs of the people working in the film production industry. The project was made on account of The Chimney Pot, a post production company in Stockholm. For the scope of this project, the research was concentrated on the part of film production that concerns The Chimney Pot, i.e. the procedures that take place after a film has been recorded. The research also focused on people working in the area of Stockholm, even if their clients and customers in other areas of Sweden and abroad were indirectly included in order for the project portal to be a usable tool in projects where these people are involved. Before any visible results can be seen in a web production project, a range of preparation steps needs to be taken. Planning is essential if the final product shall work properly. Extensive research has to be done into the industry. In order to make the product usable, the intended users, their requirements, work procedures and environment need to be examined. Only when there are substantial results and enough knowledge about the industry, the actual implementation can start. The first step is to make a functionality specification, next a site map should be produced and the technical architecture should be specified. These are the areas that are covered in this project, but there are also recommendations about how the further development should be made. Important aspects in the next phase are to create a budget, to put together a development team and to create a graphic user interface. In the whole process the issues of usability need to be considered, i.e. efficiency, flexibility, learnability and satisfaction. The key requirements for the project portal turned out to be speed and effectiveness. The user interface was designed to be intuitive and to be shallow, which means that the user should be able to perform any task with the least amount of mouse clicks possible. Another intention with the produced user interface is for it to be clearly divided into the four main areas that could be extracted from the user requirements. They are planning, project details, communication and file sharing. Directly after logging on to the project portal, the user should get an overview of all these areas. Other important considerations were security, version control and seamlessness. These issues demand a thorough planning of the technical architecture and this thesis provides some useful tips for the further development of the technical specification.