Hybrid Method for Numerical Implementation of Segmented Power Cable Conductors in Finite-element Based Ampacity Calculation

This paper addresses challenges with modelling of segmented power cable conductors using finite element analysis (FEA) for ampacity calculation. Segmented conductors improve current distribution by minimizing skin and proximity effects, thus reducing conductor losses. 2D FEA simulation offers high flexibility and accuracy beyond IEC 60287 for complex laying geometries, but the modelling of losses in segmented constructions using FEA has proven difficult due to the big difference in wire size and twisting pitch, requiring great amounts of computational power. In this paper a hybrid method is proposed, in which the IEC 60287 empirical formulae for segmented conductors are included in a 2D FEA model. The proposed method shows a good correspondence to IEC standard calculations, with deviations in conductor AC resistance of less than 1 %.Hybrid Method for Numerical Implementation of Segmented Power Cable Conductors in Finite-element Based Ampacity CalculationpublishedVersio

Land cover in Norway based on an area frame survey of vegetation types

The Norwegian area frame survey of land cover and outfield land resources (AR18X18), completed in 2014, provided unbiased statistics of land cover in Norway. The article reports the new statistics, discusses implications of the data set, and provides potential value in terms of research, management, and monitoring. A gridded sampling design for 1081 primary statistical units of 0.9 km2 at 18 km intervals was implemented in the survey. The plots were mapped in situ, aided by aerial photos, and all areas were coded following a vegetation type system. The results provide new insights into the cover and distribution of vegetation and land cover types. The statistic for mire and wetlands, which previously covered 5.8%, has since been corrected to 8.9%. The survey results can be used for environmental and agricultural management, and the data can be stratified for regional analyses. The survey data can also serve as training data for remote sensing and distribution modelling. Finally, the survey data can be used to calibrate vegetation perturbations in climate change research that focuses on atmospheric–vegetation feedback. The survey documented novel land cover statistics and revealed that the national cover of wetlands had previously been underestimated.publishedVersio

Verdsettelse av Rieber & Søn konsernet

Masteroppgave i økonomi og administrasjon - Universitetet i Agder 2010Vi har i denne oppgaven valgt å gjennomføre en verdsettelse av Rieber & Søn konsernet. Dette er en fundamental verdsettelse utført gjennom bruk av offentlige tilgjengelig informasjon. Verdsettelsesmetoden vi har benyttet oss av er ”Discounted Cash Flow Model”. Verdsettelsen gjennomføres ved å gå igjennom en strategisk analyse og en regnskapsanalyse. Dette skal danne basis for å komme frem til verdien av egenkapitalen til Rieber & Søn konsernet. Oppgaven begynner med en begrunnelse for i hvilke tilfeller man ønsker å verdsette en bedrift. Deretter følger en innføring i konsernets historie og fakta om selskapet. Etter dette har vi gått gjennom ulike verdsettelsesmetoder, for deretter å gi en begrunnelse for vårt valg av metode. Videre gjennomfører vi en strategisk analyse av selskapet. Den strategiske analysen er et viktig ledd i gjennomføringen av verdsettelsen, da den skal være med å gi et grunnlag for vårt estimat for fremtidsregnskapet til selskapet. Vi utarbeider så en regnskapsanalyse. I denne delen begynner vi med å omgruppere selskapets regnskapsoppstillinger. Grunnen til dette er at vi ønsker å verdsette aksjen fra et investorperspektiv, og det er dermed nødvendig å omarbeide regnskapsoppstillingene. Vi analyserer deretter lønnsomheten, kapitalstrukturen og likviditeten i selskapet. Dette gjøres for å gi oss et bedre grunnlag for å utarbeide et fremtidsregnskap for bedriften. For å komme frem til selskapets totalkapital har vi beregnet WACC. Etter dette presenterer vi selve verdsettelsen, hvor vi beregner horisontverdien til selskapet, og bruker modellen vi har valgt for gjennomførelsen. Her kommer vi frem til at selskapets aksjeverdi er 42,49 NOK. Per 31.12.2009 var sist omsatte kurs 41,00 NOK. Dagens aksjekurs (18.11.2010) er på 41,60 NOK. Etter verdsettelsen ved fundamental analyse utfører vi en sensitivitetsanalyse for å teste konsekvensene på selskapets pris per aksje, i fall eventuelle feilprediksjoner i våre anslag. I og med at våre anslag er svært sensitive bør man bruke dem med varsomhet. Vi har også utarbeidet en multiplikatoranalyse for å kontrollere verdien vi fant av selskapet i den fundamentale analysen av konsernet

Decryption phase in Norwegian electronic voting

We describe an efficient and secure decryption protocol to the Norwegian Internet voting project. We first adapt Groth’s shuffle-decryption from 2010 to our purpose, and we prove all security properties in the random oracle model. We then describe the complete decryption algorithm, and prove that it maintains the security of the rest of the protocol

Can Electronic Tools Help Improve Nursing Home Quality?

Background. Nursing homes face challenges in the coming years due to the increased number of elderly. Quality will be under pressure, expectations of the services will rise, and clinical complexity will grow. New strategies are needed to meet this situation. Modern clinical information systems with decision support may be part of that. Objectives. To study the impact of introducing an electronic patient record system with decision support on the use of warfarin, neuroleptics and weighing of patients, in nursing homes. Methods. A prevalence study was performed in seven nursing homes with 513 subjects. A before-after study with internal controls was performed. Results. The prevalence of atrial fibrillation in the seven nursing homes was 18.8%. After intervention, the proportion of all patients taking warfarin increased from 3.0% to 9.8% (P = 0.0086), neuroleptics decreased from 33.0% to 21.5% (P = 0.0121), and the proportion not weighed decreased from 72.6% to 16.0% (P < 0.0001). The internal controls did not change significantly. Conclusion. Statistics and management data can be continuously produced to monitor the quality of work processes. The electronic health record system and its system for decision support can improve drug therapy and monitoring of treatment policy