No description available.

The aim of this thesis is to define a solution offering end-users seamless mobility in a multi-radio access technology environment. Today an increasing portion of cell phones and PDAs have more than one radio access technology and wireless access networks of various types are commonly available with overlapping coverage. This creates a heterogeneous network environment in which mobile devices can use several networks in parallel. In such environment the device needs to select the best network for each application to use available networks wisely. Selecting the best network for individual applications constitutes a major core problem.The thesis proposes a host-based solution for access network selection in heterogeneous wireless networking environments. Host-based solutions use only information available in mobile devices and are independent of information available in the networks to which these devices are attached. The host-based decision mechanism proposed in this thesis takes a number of constraints into account including network characteristics and mobility patterns in terms of movement speed of the user. The thesis also proposes a solution for network-based mobility management contrasting the other proposals using a host-based approach. Finally, this thesis proposes an architecture supporting mobility for roaming users in heterogeneous environments avoiding the need for scanning the medium when performing vertical handovers.Results include reduced handover latencies achieved by allowing hosts to use multihoming, bandwidth savings on the wireless interface by removing the tunneling overhead, and handover guidance through the usage of directory-based solutions instead of scanning the medium. User-perceived quality of voice calls measured on the MOS (Mean Opinion Score) scale shows no or very little impact from the mobility support procedures proposed in this thesis. Results also include simulation models, real-world prototypes, and testbeds that all could be used in future work. The proposed solutions in this thesis are mainly evaluated using simulations and experiments with prototypes in live testbeds. Analytical methods are used to complement some results from simulations and experiments / Godkänd; 2010; 20100811 (karand); DISPUTATION Ämnesområde: Mobila system/Mobile Systems Opponent: Universitetslektor, docent Marcus Fiedler, Blekinge tekniska högskola Ordförande: Universitetslektor, docent Christer Åhlund, Luleå tekniska universitet Tid: Fredag den 12 november 2010, kl 11.00 Plats: A1514 Demostudion, Luleå tekniska universitet

Thesis advisor: Thomas Massaro / This thesis does not intend to diminish the incontestable contribution of technology in combating poverty and underdevelopment. On the contrary, this thesis is an expression of optimism when it comes to the use of technology in bringing some measure of welfare to those deprived of adequate conditions of life. At the same time, this thesis is a reflection on the meaning of those bold words: technology, welfare and condition of life. We tend to put them together very easily and cavalierly, but the link may be less than fully evident, especially if we do not have a clear idea of what conditions of life we are promoting and pursuing. / Thesis (STL) — Boston College, 2011. / Submitted to: Boston College. School of Theology and Ministry. / Discipline: Sacred Theology.

<p>Det här examensarbetet har utförts inom civilingenjörsutbildningen för Maskinteknik vid Linköpings tekniska högskola i samarbete med SB Truck AB. Syftet med examensarbetet var att undersöka ett antal truckmodeller för att bestämma infästningsbultarnas belastning samt hur spänningarna fördelas i de olika stativen. Infästningsbultarna håller ihop stativet och chassit.</p><p>För att kunna genomföra beräkningarna med varierande stativlängder har ett excel-blad utformats, där det är möjligt att beräkna både krafterna på infästningarna och den totala förskjutningen.</p><p>Belastningarna på modell TTFYI har beräknats både för hand och i Pro Mechanica. Resultaten för beräkningarna blev 3,9 kN respektive 3,7 kN. Resultat för övriga stativ finns tabellerade i resultatkapitlet.</p><p>Spänningarna blir generellt sett låga i samtliga stativ på den analyserade modellen. Gaffelvagnen utsätts för höga spänningskoncentrationer vid sammanfogningen mellan gaffelbenen och gaffelbröstet. För övriga stativ blir spänningskoncentrationerna relativt låga, med undantag från områdena där lasterna appliceras.</p>

No description available.

No description available.

No description available.

No description available.

Det här examensarbetet har utförts inom civilingenjörsutbildningen för Maskinteknik vid Linköpings tekniska högskola i samarbete med SB Truck AB. Syftet med examensarbetet var att undersöka ett antal truckmodeller för att bestämma infästningsbultarnas belastning samt hur spänningarna fördelas i de olika stativen. Infästningsbultarna håller ihop stativet och chassit. För att kunna genomföra beräkningarna med varierande stativlängder har ett excel-blad utformats, där det är möjligt att beräkna både krafterna på infästningarna och den totala förskjutningen. Belastningarna på modell TTFYI har beräknats både för hand och i Pro Mechanica. Resultaten för beräkningarna blev 3,9 kN respektive 3,7 kN. Resultat för övriga stativ finns tabellerade i resultatkapitlet. Spänningarna blir generellt sett låga i samtliga stativ på den analyserade modellen. Gaffelvagnen utsätts för höga spänningskoncentrationer vid sammanfogningen mellan gaffelbenen och gaffelbröstet. För övriga stativ blir spänningskoncentrationerna relativt låga, med undantag från områdena där lasterna appliceras.

This research is to do a study on the technology sourcing strategy for the information technology or the technology of information products while the high-tech domestic corporations are choosing to develop the information system technology. These three strategies are: the way of technology sourcing, the characteristics of technology, and the factors that are beyond the products. To discuss the strategic affected factors while choosing the technology sourcing strategy is the main thesis.The information electronic industry is the main object in this research. Each corporation discusses for the mode of information system technology sourcing. The result shows that ¡§the in-housing R&D ¡¨ is the priority to be considered while high-tech domestic corporations are thinking about information system technology sourcing. But the result also shows that professional knowledge in cost and in the information system technology personnel is insufficient. The studied corporations used the way of ¡§in-housing R&D¡¨ at the beginning, and then they get the technology via outsourcing. The main reason for that is to shorten the period of research time and make the cost lower. In the affected factors among the decided ways of information system technology, the most conspicuous way is the ¡§availability of licensing-in¡¨. The author through deeply interviewing with studied corporations found out that the technology sourcing strategies of information system are multi-channel. The ¡§technology outsourcing¡¨ and ¡§in-house R&D¡¨ are not substitute, however, are complementary. Among the technology sourcing strategies, ¡§the availability and urgency of licensing-in¡¨ plays an important role, that is, the main part of transaction cost items of each cost. As a whole, transaction cost theory could explain the evaluation while the corporations are making the information system strategy.