Information visualization for mobile devices: A novel approach based on the MagicEyeView

Visualization on mobile devices not only means accommodating to a small screen space, but also widely different aspect ratios. Improving on the MagicEyeView algorithm, this paper presents a visualization technique that is better suited to screens with skewed aspects ratios. The presented approach is a focus+context visualization effort which employs distortion of coordinate scales and a "fisheye" technique. The visualization algorithm is evaluated in the problem domain of business management and the presentation of "Key Performance Indicators"

Integrating perceptual, device and location characteristics for wireless multimedia transmission

In this paper,we describe an investigation exploring user experiences of accessing streamed multimedia content, when that content is tailored according to perceptual, device and location characteristics. To this end, we have created pre-defined transmission profiles and stream perceptually tailored multimedia content to three different locations, each characterised by different infotainment requirements. In the light of our results, we propose that multimedia transmission to mobile and wireless devices should be made based on pre-defined profiles, which contains a combination of static (perceptual, device type, CPU speed, and display specifications) and dynamic information (streamed content type location of the device/user, context of the device/user). The evaluation of such a system showed that the users and service providers can gain from such an approach considerably, as user perceptions of quality were not detrimentally affected by QoS degradations. Consequently, service providers can utilise this information to effectively manage local network traffic and bandwidth

Distributed resource discovery using a context sensitive infrastructure

Distributed Resource Discovery in a World Wide Web environment using full-text indices will never scale. The distinct properties of WWW information (volume, rate of change, topical diversity) limits the scaleability of traditional approaches to distributed Resource Discovery. An approach combining metadata clustering and query routing can, on the other hand, be proven to scale much better. This paper presents the Content-Sensitive Infrastructure, which is a design building on these results. We also present an analytical framework for comparing scaleability of different distribution strategies

Distributed tuplespace and location management - an integrated perspective using Bluetooth

Location based or "context aware" computing is becoming increasingly recognized as a vital part of a mobile computing environment. As a consequence, the need for location-management middleware is widely recognized and actively researched. Location management is frequently offered to the application through an API where the location is given in the form of coordinates. It is the opinion of the authors that a localization API should offer localized data (e.g. direction to the nearest pharmacy) directly through a transparent and integrated API. Our proposed middleware for location and context management is built on top of Mobispace. Mobispace is a distributed tuplespace made for J2me units where replication between local replicas takes place with a central server (over GPRS) or with other mobile units (using Bluetooth). Since a Bluetooth connection indicates physical proximity to another node, a set of stationary nodes may distribute locality information over Bluetooth connections, and this information may be retrieved through the ordinary tuplespace AP

Location based mobile computing - a tuplespace perspective

This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2006 IOS PressLocation based or "context aware" computing is becoming increasingly recognized as a vital part of a mobile computing environment. As a consequence, the need for location-management middleware is widely recognized and actively researched. Location-management is frequently offered to the application through a "location API" (e.g. JSR 179) where the mobile unit can find out its own location as coordinates or as "building, floor, room" values. It is then up to the application to map the coordinates into a set of localized variables, e.g. direction to the nearest bookshop or the local timezone. It is the opinion of the authors that a localization API should be more transparent and more integrated: The localized values should be handed to the application directly, and the API for doing so should be the same as the general storage mechanisms. Our proposed middleware for location and context management is built on top of Mobispace. Mobispace is a distributed tuplespace made for mobile units (J2me) where replication between local replicas takes place with a central server (over GPRS) or with other mobile units (using Bluetooth). Since a Bluetooth connection indicates physical proximity to another node, a set of stationary nodes may distribute locality information over Bluetooth connections, and this information may be retrieved through the ordinary tuplespace API. Besides the integration with the general framework for communication and coordination the middleware offers straightforward answers to questions like: Where is node X located? Which nodes are near me? What is the trace of node Y

Population Based Routing in LEO Satellite Networks

Packet switching in a Low Earth Orbit (LEO) satellite network may calculate the best traffic route through the less populated areas of the planet, in order to avoid relaying through the busiest satellites. A number of ideas for route calculation in a LEO system have been evaluated and the performance results are presented. This paper reports from ongoing research on Space Information Networks (SIN) with the purpose to offer application services in a LEO satellite network to mobile users. The conclusion is that route calculation based on population density gives a moderate, but significant improvement in resource utilization.publishedVersio

Anaerobic digestion affecting nitrous oxide and methane emissions from the composting process

Composting and anaerobic digestion are the most common ways to treat organic residues. Sometimes the organic rest after anaerobic digestion is also composted. In this study we investigated greenhouse gas emissions from composting raw food waste compared to composting solid digestate of food waste. Cumulative methane emissions over 3 weeks were found to be almost 12 times higher from composting digested food waste than from raw food waste suggesting that the microbial community transferred from the anaerobic digestion to the compost process enhanced these emissions. Cumulative nitrous oxide emissions were also higher when composting solid digestate was compared to composting raw food waste, but the global warming potential was mostly driven by the impact of methane emissions. In conclusion, methane production during digestate composting can be high, therefore eliminating methane producing microbes in digestate before composting could be a promising way to reduce greenhouse gas emissions.acceptedVersio

Cooperative Caching in Space Information Networks

publishedVersio

Og lærerne stod igjen... En kritisk diskursanalyse av læreres opplevelse av digitaliseringen i grunnskolen.

Denne masteroppgaven har ved hjelp av en Fairclough-inspirert kritisk diskursanalyse (CDA) hatt som mål å få innsikt i hvilke diskurser som er i virke blant lærere i forhold til den digitale utviklingen i Osloskolen generelt, og utviklingen av deres profesjonsfaglige digitale kompetanse spesielt. Gjennom en analyse av semistrukturerte dybdeintervjuer med seks lærere på 5.-7. trinn i Osloskolen, og en gjennomført spørreundersøkelse blant andre lærere i samme målgruppe, avdekkes tre hoveddiskurser blant lærerne. Ved hjelp av Faircloughs tredimensjonale modell for kritisk diskursanalyse sees disse funnene i lys av utdanningspolitisk utvikling fra begynnelsen av 2000-tallet, da ‘digitale ferdigheter’ ble innført som den femte grunnleggende ferdigheten i norsk grunnskole. Denne oppgaven viser at i den nasjonale utdanningspolitiske diskursen, blant annet gjennom det nasjonale prosjektet Læreløftet, reformen som har som mål å heve fagkompetansen til alle lærere i norsk grunnskole, har utviklingen av lærernes profesjonsfaglige digitale kompetanse (PfDK) hverken i særlig grad blitt tatt hensyn til, eller blitt inkludert.This master thesis has, using a Fairclough-inspired critical discourse analysis (CDA), aimed to provide insight into what discourses are to be found among teachers through their experiences regarding the digitalisation process in general, and the development of their professional digital competence in particular. Through the analysis of semi structured in-depth interviews of six primary school teachers, and a survey conducted among other primary school teachers in Oslo, three main discourses are found to be prominent among the teachers. Using Fairclough’s three-dimensional model for CDA, the findings are analysed through looking at the political development of the educational policies from the year 2000, at the time where ‘digital skills’ were included to be the fifth basic skill enshrined as a constitutional right for all students to learn in school. This thesis reveals that through the discourse of national educational policy, and national reform such as Lærerløftet, where the goal has been to elevate teachers’ professional competence, the development of their professional digital competence has to a large degree been neglected, or not been included