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Sivertun, Åke
Publications (10 of 24) Show all publications
Dulanya, Z., Simfors, N. & Sivertun, Å. (2010). Comparative study of the silica and cation geothermometry of the Malawi hot springs: Potential alternative energy source. JOURNAL OF AFRICAN EARTH SCIENCES, 57(4), 321-327
Open this publication in new window or tab >>Comparative study of the silica and cation geothermometry of the Malawi hot springs: Potential alternative energy source
2010 (English)In: JOURNAL OF AFRICAN EARTH SCIENCES, ISSN 1464-343X, Vol. 57, no 4, p. 321-327Article in journal (Refereed) Published
Abstract [en]

Malawi is one of the poorest countries in the world and one of the most densely populated in south-eastern Africa. Its major power source is hydro-electricity. During the past few years, the power generation capacity has been reduced, which has impacted negatively on the socio-economic development of the country. The country holds an enormous potential to generate geothermal energy due to the countrys position within the Great African Rift valley. This could contribute to economic growth, poverty reduction and technological development in Malawi. The paper presents findings of research on comparisons between silica (quartz and chalcedony) and cation geothermometers (Na-K, Na-K-Ca and K-Mg) of hot springs in the Malawi Rift, in order to deduce the temperature at depth of selected hot springs. The saturation indices of most springs have a bearing on the geology of the areas where these hot springs are found. The Na-K geothermometers are, in general, higher than the Na-K-Ca geothermometer and the K-Mg geothermometer shows temperatures that are too low to be considered. The difference in the results between the different geothermometers may indicate shallow conditions of mixing with ground-water. Results also indicate that some hot springs have sufficient heat-generating capabilities and warrant further exploration work to assess their suitability for energy generation.

Place, publisher, year, edition, pages
Elsevier Science B.V., Amsterdam., 2010
Keywords
Malawi Rift, Hot springs, Cation and silica geothermometers, Equilibration
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-57406 (URN)10.1016/j.jafrearsci.2009.11.001 (DOI)000278241600004 ()
Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2013-03-28
Abugessaisa, I. & Sivertun, Å. (2009). ICT in regional networks in the field of culture and development cooperation in 15th Americas Conference on Information Systems 2009, AMCIS 2009, vol 4, issue , pp 2667-2674. In: AMCIS 2009 Proceedings, 15th Americas Conference on Information Systems 2009,: . Paper presented at 15th Americas Conference on Information Systems 2009, AMCIS 2009 (pp. 2667-2674). , 4
Open this publication in new window or tab >>ICT in regional networks in the field of culture and development cooperation in 15th Americas Conference on Information Systems 2009, AMCIS 2009, vol 4, issue , pp 2667-2674
2009 (English)In: AMCIS 2009 Proceedings, 15th Americas Conference on Information Systems 2009,, 2009, Vol. 4, p. 2667-2674Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents results from a mapping study commissioned by Swedish International Development Agency (Sida), which has supported regional and global networking within the field of culture. The mapping study was carried out in East Africa to find ways to collect and use experiences already made and to draw conclusions on the status and use of ICT in the culture networks supported by Sida. Another goal was to gain an understanding of the level to which ICT is used within the cultural sectors in East Africa. The study was focused on two main cultural sectors - museums and drama/theatre. A variety of research methods were used. It was found that there were well-established culture networks in both theatre and museum sectors. Through these networks, ICT has been used for sharing knowledge as well as being a tool for communication. Also it has supported dialogue among many different culture groups in the region. © (2009) by the AIS/ICIS Administrative Office All rights reserved.

Series
15th Americas Conference on Information Systems 2009, AMCIS 2009
Keywords
Culture Networks; DRAMATOOL; East Africa; ICT; Sida
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-100690 (URN)
Conference
15th Americas Conference on Information Systems 2009, AMCIS 2009
Available from: 2013-11-12 Created: 2013-11-11 Last updated: 2013-11-19
Abugessaisa, I., Sivertun, Å. & Le Duc, M. (2007). A Systemic View on Swedish Traffic Accident Data Acquisition System. In: Proceedings of the 14th International Conference on Road Safety on Four Continents (RS4C), 14-16 November, Bangkok, Thailand: (pp. 1-12). Sweden: VTI
Open this publication in new window or tab >>A Systemic View on Swedish Traffic Accident Data Acquisition System
2007 (English)In: Proceedings of the 14th International Conference on Road Safety on Four Continents (RS4C), 14-16 November, Bangkok, Thailand, Sweden: VTI , 2007, p. 1-12Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents work in progress to study information sharing among road safety organizations. The focus is to study accident data acquisition system. In 2002, Swedish Road Transport authority (SRT) has accepted STRADA as accident reporting system to be used by the police all over Sweden. Such system is vital for coordinating, maintaining and auditing road safety in the country. Normally road accidents are reported by the police or by Emergency unit at the hospital. However more than 50% of the hospitals in Sweden didn’t use the system which decrease the utilization of the system and reduce the quality of the information that demanded. By using system thinking approach in this study we try to see why such situation is occurred and how changes can be introduced and handle to overcome such problem. Interviews conducted with focus group and different users of the system. To investigate the issues related to the acceptance of the system we use Technology Acceptance Model (TAM). We recommend getting the user involved in the life cycle of the STRADA and also the developers could use enabling system to overcome problems in related to system usability and complexity. Also we suggest the use of iterative development to govern the life cycle.

Place, publisher, year, edition, pages
Sweden: VTI, 2007
Keywords
STRADA Information sharing Road accidents recording system
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13188 (URN)
Available from: 2008-04-28 Created: 2008-04-28 Last updated: 2009-04-23Bibliographically approved
Abugessaisa, I., Sivertun, Å. & Le Duc, M. (2007). GLOBESAFE: A Platform for Information-Sharing Among Road Safety Organizations. In: IFIP-W.G. 9th International Conference on Social Implications of Computers in Developing Countries: May 2007, São Paulo, Brazil: (pp. 1-10).
Open this publication in new window or tab >>GLOBESAFE: A Platform for Information-Sharing Among Road Safety Organizations
2007 (English)In: IFIP-W.G. 9th International Conference on Social Implications of Computers in Developing Countries: May 2007, São Paulo, Brazil, 2007, p. 1-10Conference paper, Published paper (Refereed)
Keywords
information sharing, road safety
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13187 (URN)
Available from: 2008-04-28 Created: 2008-04-28 Last updated: 2009-04-23Bibliographically approved
Roy, C., Kovordanyi, R., Ahmed, R., Gumos, A. & Sivertun, Å. (2006). Cyclone Tracking and Forecasting in Bangladesh Using Satellite Images without Supplementary Data. In: NordGIS 2006,2006.
Open this publication in new window or tab >>Cyclone Tracking and Forecasting in Bangladesh Using Satellite Images without Supplementary Data
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2006 (English)In: NordGIS 2006,2006, 2006Conference paper, Published paper (Refereed)
Abstract [en]

The cost of Bangladesh is extremely exposed to tropical cyclones because of its long costal line containing shallow deltas and densely populated offshore islands. This entails that tropical cyclones will have a particularly severe impact causing high fatality mostly among the poor people on the costal region. In spite of regular attack of devastating cyclones in Bangladesh coast, it-s impact on human lives as well as infrastructure and natural resources have been reduced considerably. The damage reduction reached at a level which is now difficult to down further because of two reasons. First is the insufficient information for early preparedness and second is the ineffective after-cyclone damage restoration system. It is therefore especially important in this part of the world that cyclones can be predicted well in advance before landfall. Normally, cyclone tracking and forecasting is based on satellite images supplemented with data collected using floating buoys, naval ships, dropsondes, airplanes carrying a wide range of active and passive sensors. In Bangladesh however, there is a lack of supplementary data. Meteorologists in Bangladesh are therefore forced to rely on satellite images only (NOAA-AVHRR). The aim of this project is to assess the informational contents of satellite images and identify their limitations in forecasting tropical cyclones. A first step in the project is to assess to what extent current models used for forecasting around the world are dependent on supplementary data, and on the other hand to what extent they could be used to predict tropical cyclones using satellite images only.

National Category
Computer Sciences
Identifiers
urn:nbn:se:liu:diva-35868 (URN)28887 (Local ID)28887 (Archive number)28887 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2018-01-13
Abugessaisa, I., Sivertun, Å. & Le Duc, M. (2006). Map as Interface for Shared Information: A Study of Design Principles and User Interaction Satisfaction. In: IADIS International Conference WWW/Internet 2006: Murcia, Spain: (pp. 377-384).
Open this publication in new window or tab >>Map as Interface for Shared Information: A Study of Design Principles and User Interaction Satisfaction
2006 (English)In: IADIS International Conference WWW/Internet 2006: Murcia, Spain, 2006, p. 377-384Conference paper, Published paper (Refereed)
Keywords
Maps, shared information, design priciples, user satisfaction
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13186 (URN)972-8924-19-4 (ISBN)
Available from: 2008-04-28 Created: 2008-04-28 Last updated: 2009-02-05Bibliographically approved
Nilsson, S., Trnka, J., LeDuc, M. & Sivertun, Å. (2005). Aspects of GI and GIS Use in Pre-and Post-flooding Phases of Swedish Emergency Management - a case study. In: European Safety, Reliability Data Association Seminar,2005 (pp. 213). Ispra, Italy: Joint Research Centre
Open this publication in new window or tab >>Aspects of GI and GIS Use in Pre-and Post-flooding Phases of Swedish Emergency Management - a case study
2005 (English)In: European Safety, Reliability Data Association Seminar,2005, Ispra, Italy: Joint Research Centre , 2005, p. 213-Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the present role of geographic information (GI) and geographic information systems (GIS) in flood emergency management (EM) is investigated. A case study method is used to study pre- and post-flooding phases of EM in two Swedish municipalities. The results indicate apparent ontological and semantic differences between the involved decision-makers on what constitutes important problems and on what type of information is relevant. Furthermore, knowledge of GI and GIS was also found differing between the decision-makers. Organizational, conceptual, ontological, and semantic problems were identified as essential for GI and GIS utilization. Concerning the increasing role of GI and GIS in EM, further research on the studied problems is necessary as their elimination or at least minimization is a prerequisite for introducing a mature GIS in flood EM.

Place, publisher, year, edition, pages
Ispra, Italy: Joint Research Centre, 2005
Keywords
Geographical information, geographical information systems, emergency management, flooding
National Category
Computer Sciences
Identifiers
urn:nbn:se:liu:diva-31130 (URN)16866 (Local ID)16866 (Archive number)16866 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2018-01-13
Abugessaisa, I. & Sivertun, Å. (2005). Benchmarking Road Safety Situations Using OGC Model of Portrayal Workflow. In: Proceedings of the 13th International Conference on Geoinformatics (GeoInformatics’5), 17-19 August, Toronto, Canada: Ryerson University: .
Open this publication in new window or tab >>Benchmarking Road Safety Situations Using OGC Model of Portrayal Workflow
2005 (English)In: Proceedings of the 13th International Conference on Geoinformatics (GeoInformatics’5), 17-19 August, Toronto, Canada: Ryerson University, 2005Conference paper, Published paper (Other academic)
Keywords
road safety, benchmarking, OGC model
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13185 (URN)
Available from: 2008-04-28 Created: 2008-04-28 Last updated: 2009-04-21
Trnka, J., Le Duc, M. & Sivertun, Å. (2005). Inter-organizational Issues in ICT, GIS and GSD - Mapping Swedish Emergency Management at the Local and Regional Level. In: Van de Walle, B. & Carlé, B. (Ed.), Proceedings of the 2nd International Conference on Information Systems for Crisis Response and Management (ISCRAM): . Paper presented at 2nd International Conference on Information Systems for Crisis Response and Management (ISCRAM), Brussels, Belgium. April 18-20 2005. (pp. 75-82). Tilburg, Netherlands: Tilburg University
Open this publication in new window or tab >>Inter-organizational Issues in ICT, GIS and GSD - Mapping Swedish Emergency Management at the Local and Regional Level
2005 (English)In: Proceedings of the 2nd International Conference on Information Systems for Crisis Response and Management (ISCRAM) / [ed] Van de Walle, B. & Carlé, B., Tilburg, Netherlands: Tilburg University , 2005, p. 75-82Conference paper, Published paper (Refereed)
Abstract [en]

Inter-organizational issues are very challenging in emergency management (EM). In this paper, aspects of information and communication technologies (ICT), geographical information systems (GIS) and geospatial data (GSD) in the Swedish EM system, an EM system involving a large number of EM organizations, are reported based on a case study. The issues concerned include separated ICT & GIS development between organizations and formation of technological coalitions, problems of identification and access of GSD, located through the large number organizations, as well as uncoordinated launching of web-based GIS service. Possible implications of this situation for command and control are discussed. Additionally, areas for further research are suggested.

Place, publisher, year, edition, pages
Tilburg, Netherlands: Tilburg University, 2005
Keywords
Emergency management, ICT, GIS, inter-organizational cooperation, geospatial data exchange, services
National Category
Computer Sciences
Identifiers
urn:nbn:se:liu:diva-32464 (URN)18370 (Local ID)90-7697-109-9 (ISBN)18370 (Archive number)18370 (OAI)
Conference
2nd International Conference on Information Systems for Crisis Response and Management (ISCRAM), Brussels, Belgium. April 18-20 2005.
Note

Mike Meleshkin Award for best ISCRAM 2005 PhD student paper received.

Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2018-01-13
Gustafsson, T., Carleberg, P., Svensson, P., Nilsson, S. & Sivertun, Å. (2005). Mixed Reality Systems for Technical Maintenance and Gaze-Controlled Interaction. Linköping: FOI sensorteknik
Open this publication in new window or tab >>Mixed Reality Systems for Technical Maintenance and Gaze-Controlled Interaction
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2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: FOI sensorteknik, 2005
Series
FOI-R--1695--SE
Keywords
Mixed Reality, Augmented Reality, technical maintenance, gaze controlled interaction, human machine interaction, MR, AR, HCI
National Category
Computer Sciences
Identifiers
urn:nbn:se:liu:diva-31132 (URN)16868 (Local ID)16868 (Archive number)16868 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2018-01-13
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