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Sökning: LAR1:hh > (2005-2009) > (2005) > Licentiatavhandling

  • Resultat 1-7 av 7
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1.
  • Agelis, Sacki (författare)
  • Reconfigurable Optical Interconnection Networks for High-Performance Embedded
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In embedded computer and communication system the capacity demand for interconnection networks is increasing continuously in order to achieve high-performance systems. Recent breakthroughs show that by using reconfigurability inside a single chip substantial performance gains can be added. However, in this thesis the focus is on system level reconfigurability (between chips or modules) and the performance gains that potentially can be achieved by having support for runtime reconfigurability on the system level.This thesis addresses the field of runtime system level reconfigurability with the use of optics in switches and routers for data- and telecommunications, and in multi-processor systems used for embedded signal processing. Several reconfigurable systems for switching and routing with support to adapt for asymmetric traffic patterns are proposed and compared to identify how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage optical interconnection networks with reconfigurable shuffle patterns, where the reconfigurability is provided by micro-optical-electrical mechanical systems. More specifically, application-specific bottlenecks can be resolved by reconfiguring the interconnection network according to the current application demands. The benefits of the architectural solutions are confirmed by simulations that clearly show that the architectures can achieve high performance for both symmetric application characteristics and for several classes of asymmetric application characteristics. The final architectural solution is characterized by electronic packet-switches interconnected through an optical backplane, which is reconfigurable. Moreover, the thesis presents how several signal processing applications can be mapped to run concurrently in a time-shared scheme on a single reconfigurable multi-processor system that has high flexibility to adapt for the application currently at hand. The interconnection network is then adapted (reconfigured) according to the demands of the currently executed application in each time instance. The analysis shows that it is feasible to build such a system with today’s components.
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2.
  • Bergman, Lars (författare)
  • Using Multicoloured Halftone Screens for Offset Print Quality Monitoring
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In the newspaper printing industry, offset is the dominating printing method and the use of multicolour printing has increased rapidly in newspapers during the last decade. The offset printing process relies on the assumption that an uniform film of ink of right thickness is transferred onto the printing areas. The quality of reproduction of colour images in offset printing is dependent on a number of parameters in a chain of steps and in the end it is the amount and the distribution of ink deposited on the substrate that create the sensation and thus the perceived colours. We identify three control points in the offset printing process and present methods for assessing the printing process quality in two of these points:• Methods for determining if the printing plates carry the correct image• Methods for determining the amount of ink deposited onto the newsprintA new concept of colour impression is introduced as a measure of the amount of ink deposited on the newsprint. Two factors contribute to values of the colour impression, the halftone dot-size and ink density. Colour impression values are determined on gray-bars using a CCD-camera based system. Colour impression values can also be determined in an area containing an arbitrary combination of cyan magenta and yellow inks. The correct amount of ink is known either from a reference print or from prepress information. Thus, the deviation of the amount of ink can be determined that can be used as control value by a press operator or as input to a control system.How a closed loop controller can be designed based on the colour impression values is also shown.It is demonstrated that the methods developed can be used for off-line print quality monitoring and ink feed control, or preferably in an online system in a newspaper printing press.
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3.
  • Bilstrup, Urban, 1971- (författare)
  • Design Space Exploration of Wireless Multihop Networks
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis explores the feasible design space of wireless multihop networks and identifies fundamental design parameters. In the process of exploring it is important to ignore all details and instead take a holistic view. This means that all protocol details are overseen, all details of radio wave propagation models are overseen and the system is modelled strictly on an architectural level. From a theoretical information perspective, there is a limit to the capacity that a certain bandwidth and a certain signal-to-noise ratio at the receiver can provide. This limit is approximated as a volume in the time-frequency-space domain. A single transmission is represented as an occupied volume in this domain. A wireless multihop network covers a spatial area, and the question is how multiple numbers of transmission volumes can be fit into a given limited spatial area. This volume fitting should be done in order to maximize the overall performance or to trade available resources to favour a specific characteristic in the wireless multihop network. The volume model is used for the design space exploration of a wireless multihop network. It is argued that the fault tolerance and the energy gain achieved in a multihop topology are its strength as compared to a single-hop architecture. It is further shown that the energy gain is achieved at the expense of delay and a greater end-to-end error probability. This indicates that these parameters must be very carefully balanced in order to gain in the global overall performance perspective. It can further be concluded that the overall spatial capacity is increased as a result of the spatial channel reuse in a multihop topology. On the other hand, it is also shown that the multihop topology introduces a rather stringent geometrical capacity limitation when the number of nodes of a wireless multihop network is increased. The dynamics (e.g. node mobility, changing radio channels etc.) of a large scale wireless multihop network is also a limiting factor. The nodes’ mobility creates a knowledge horizon beyond which very little can be known about the present network topology.
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4.
  • Nilsson, Bertil, 1953- (författare)
  • Adaptive Finite Element Methods for the Reynolds Thin Film Model with Cavitation
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The main purpose of this thesis is to use modern goal-oriented adaptive finite element techniques in order to improve the numerical simulation of tribology. Two novel adaptive finite element methods for the Reynolds thin film model including cavitation are presented and their different strategies are compared. The algorithms are inspired by an analogy with the obstacle problem and the cavitation problem that we consider is written as a variational inequality considering in the formulation the fact that the lubricant can not stand negative stresses induced by sub-atmospheric pressure. A posteriori, error estimates and adaptive algorithms are derived, and numerical examples illustrating the theory are supplied. The cavitation problem and calculations is introduced and put into historical and modern perspective. Modern thoughts and techniques around the oil-pocket idea in sheet metal forming are presented. The influence of oil pockets on the contact regime is assessed, and in particular the likely effect of oil-pocket-induced cavitation in order to produce lift, is discussed. The ultimate goal with the numerical simulation is to be able to optimize the surface structure so as to take advantage of cavitation effects in the lubricant.
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6.
  • Svetoft, Ingrid (författare)
  • Brukarnas krav i byggprocessen : en fallstudie
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In 1996, the artillery regiment, A4, in Östersund was disbanded. Their former premises underwent remodelling to serve as the new campus for the Mid Sweden University. The express intention was that the new occupiers would be allowed to take part in the planning process. During 1997 the company Vasallen became the owner of the premises, by direction of the Ministry of Finance. Vasallen was charged with the management of former military premises and increasing their value with the aim of selling the property. Thanks to their well-defined mission and good financial resources, Vasallen became a new actor on the property market. In the same year, a number of architectural firms were invited to take part in a competition. At the beginning of 1998, SWECO FFNS was chosen as the winner, and the planning process started immediately. The new campus was inaugurated on September 6, 2002 with the Swedish Prime Minister, Göran Persson, in attendance. The aim of this study was to monitor how well the demands of the new occupiers regarding quality and environment were met, and how these demands were managed during the construction process. My ambition was to study the process as a case study in order to better understand and reflect on what actually happens in the communication between partners. The material on which the study is based was gathered by participation in planning meetings and by following the construction process. The Campus Östersund project was unique in many ways. In the first place, the existing buildings form a sound basis as they were intentionally designed with the needs and well-being of the individual in mind. Many qualities were thus already incorporated into the buildings on the site. The strict regulations imposed by the fact that these were classed as historical buildings set certain limitations, while at the same time posing a challenge to be overcome. The stark contrast between a military regiment and the activities of a modern university placed high demands on those involved in the project. The user’s wishes and demands, working environment factors, structural issues and demands on comfort always have a tendency to take second place after financial factors. In this case, however, the owner’s and user’s joint ambition led to the reconsideration of priorities concerning, for example, the working environment. Finally, the project was unique as a fully comprehensive view of the process and final product was adopted by the two main partners. This includes, for example, observing environmental assets throughout the whole project. In 1996, the artillery regiment, A4, in Östersund was disbanded. Their former premises underwent remodelling to serve as the new campus for the Mid Sweden University. The express intention was that the new occupiers would be allowed to take part in the planning process. During 1997 the company Vasallen became the owner of the premises, by direction of the Ministry of Finance. Vasallen was charged with the management of former military premises and increasing their value with the aim of selling the property. Thanks to their well-defined mission and good financial resources, Vasallen became a new actor on the property market. In the same year, a number of architectural firms were invited to take part in a competition. At the beginning of 1998, SWECO FFNS was chosen as the winner, and the planning process started immediately. The new campus was inaugurated on September 6, 2002 with the Swedish Prime Minister, Göran Persson, in attendance. The aim of this study was to monitor how well the demands of the new occupiers regarding quality and environment were met, and how these demands were managed during the construction process. My ambition was to study the process as a case study in order to better understand and reflect on what actually happens in the communication between partners. The material on which the study is based was gathered by participation in planning meetings and by following the construction process. The Campus Östersund project was unique in many ways. In the first place, the existing buildings form a sound basis as they were intentionally designed with the needs and well-being of the individual in mind. Many qualities were thus already incorporated into the buildings on the site. The strict regulations imposed by the fact that these were classed as historical buildings set certain limitations, while at the same time posing a challenge to be overcome. The stark contrast between a military regiment and the activities of a modern university placed high demands on those involved in the project. The user’s wishes and demands, working environment factors, structural issues and demands on comfort always have a tendency to take second place after financial factors. In this case, however, the owner’s and user’s joint ambition led to the reconsideration of priorities concerning, for example, the working environment. Finally, the project was unique as a fully comprehensive view of the process and final product was adopted by the two main partners. This includes, for example, observing environmental assets throughout the whole project. Brukarmedverkan i byggprocessen –en fallstudie 12 Building the “right product” is an important argument for including the end user in the project. By initiating a planning process in which the user’s demands and wishes are considered, one not only initiates the actual building process, but also a process in the client’s organisation. The capacity to participate in such a process within the organisation is, however, not always good. Clarity and respect for the processes initiated were not always particularly pronounced in this case. Lack of clarity sometimes led to confusion, which in turn led to complications in communication and thus delay in the project. The internal process in an organisation should, if possible, progress simultaneously with, and be firmly established before, meetings with the consultants. Theoretical studies have confirmed the importance of utilizing the process of change in internal organisational development in order to achieve a positive attitude among employees. Participation of the end user in a large organisation is often based on representatives in working parties. These representatives should be motivated, be given the time required within the framework of their job, and have the confidence of their colleagues. The opportunity to influence decisions is great in the initial stages. The user should have knowledge concerning the various phases of construction, the financial and legal framework, and the rules and regulations governing the project. Being able to participate in creating one’s own working environment elicits various degrees of commitment and levels of expectation in the user organisation. Both the occupants and the consultants should have the capacity for this kind of development, especially the latter as they constitute the “front line”. The user should understand the relation between desires and possible financial effects. The price tag for alternative demands/wishes and the effects these will have on the final rent should be clearly visible. It is an advantage if this is made clear very early on in the project. The dialogue between the parties should thus be supplemented by the architect explaining to the new occupiers where limitations and opportunities lie in the project. The parties involved must have a certain degree of pedagogical competence in order to explain and manage the project to everyone’s satisfaction. A good environment is seldom described in terms of formulated concepts outside the architectural community. Projects in which the end user is involved thus provide a unique opportunity to start building up a bank of knowledge including expressions used by non-experts to describe concepts of space. Difficulties are encountered when all these views are to be accepted and implemented in the building process through descriptions and drawings. Words are replaced by numbers, and more and more actors are involved, for example, engineering consultants. We simply do not have all the necessary tools with which to express wishes concerning the physical environment. We can, however, bridge the communication gap between users and consultants by using computer-aided information systems. The ideas expressed by the user can be transformed into three-dimensional video sequences, and thus be confirmed as being, “just what we meant”. It was apparent quite early on in this research that the technical terms available were not adequate to describe the events of this case. The end user’s feeling of not being able to keep up with the consultants’ technical concepts may lead them to feel that they are at a disadvantage, which certainly will not benefit the process. Here, the role of the architect as a pedagogue is important in leading the various participants into the planning process. One of the actors should perhaps have some kind of skills in behavioural science and Brukarmedverkan i byggprocessen –en fallstudie education. Perhaps changes should be made in the training of architects and other consultants. Respect for the common process is perhaps the most important factor for its success, together with clarity and openness. These are terms not traditionally used in construction projects. The interpretation of the customer’s wishes, explaining the opportunities and limitations of the building, and planning for future expansion are the responsibility of the architect. Does a single actor have a reasonable chance of coping with this in a large-scale project? All the participants should gain broad insight into each other’s jobs and roles early on in the project. Respect for the responsibilities and roles of others can be built up by concentrated efforts to exchange knowledge through dialogue early in the process. The incentive for participating varies from one
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