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Publications (10 of 20) Show all publications
Byamukama, M., Akol, R., Bakkabulindi, G., Pehrson, B., Olsson, R. & Sansa-Otim, J. (2018). Energy Storage Options for Environment Monitoring Wireless Sensor Networks in Rural Africa. In: Proceedings - 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering, CPE-POWERENG 2018: . Paper presented at 12th IEEE International Conference on Compatibility, Power Electronics and Power Engineering, CPE-POWERENG 2018, Hilton Doha HotelDoha, Qatar, 10 April 2018 through 12 April 2018. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Energy Storage Options for Environment Monitoring Wireless Sensor Networks in Rural Africa
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2018 (English)In: Proceedings - 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering, CPE-POWERENG 2018, Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

This paper explores various traditional and emerging battery technologies available for deployments of automated environment monitoring devices using Wireless Sensor Networks (WSNs) in Africa and the considerations designers must take into account when implementing these systems. Environment-monitoring applications of WSNs are focusing more on reducing power consumption and optimizing data transmission and less on the constraints that their applications and deployment environments put on the energy storage device. We describe the various properties of energy storage devices and, for each, we highlight the requirements to be met for environment monitoring applications, especially in remote areas in Africa. We evaluate the performance of some of these energy storage options against the requirements using three use cases. We indicate the technologies that have shown reliability for each use case. We show that emerging battery technologies, such as Lithium Ion Capacitors are well suited for long-life low power deployments while the options for high-power deployments depend on the constraints faced by the designers, such as the power consumption of the sensor network components sand environment temperature range of the deployment environment.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
Compatibility Power Electronics and Power Engineering, ISSN 2166-9546
Keywords
Environment Monitoring, Automatic Weather Station, Battery, Energy Storage, Wireless Sensor Network
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-235466 (URN)10.1109/CPE.2018.8372600 (DOI)000443797900116 ()2-s2.0-85048872534 (Scopus ID)978-1-5386-2508-8 (ISBN)
Conference
12th IEEE International Conference on Compatibility, Power Electronics and Power Engineering, CPE-POWERENG 2018, Hilton Doha HotelDoha, Qatar, 10 April 2018 through 12 April 2018
Note

QC 20180928

Available from: 2018-09-28 Created: 2018-09-28 Last updated: 2018-11-20Bibliographically approved
Byamukama, M., Nannono, J. N., Ruhinda, K., Pehrson, B., Nsabagwa, M., Akol, R., . . . Kondela, E. (2017). Design Guidelines for Ultra-low Power Gateways in Environment Monitoring Wireless Sensor Networks. In: Cornish, D R (Ed.), 2017 IEEE AFRICON: . Paper presented at IEEE AFRICON Conference - Science, Technology and Innovation for Africa, SEP 18-20, 2017, Cape Town, SOUTH AFRICA (pp. 1472-1478). Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Design Guidelines for Ultra-low Power Gateways in Environment Monitoring Wireless Sensor Networks
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2017 (English)In: 2017 IEEE AFRICON / [ed] Cornish, D R, Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 1472-1478Conference paper, Published paper (Refereed)
Abstract [en]

We explore techniques that can be used to reduce the power consumption of gateways in wireless sensor networks deployed in environment monitoring applications, such as Automatic Weather Stations (AWS). The challenge is the deployment of these networks in locations that are far from a consistent power source, such as a national grid. Such stations must be autonomous and power consumption must be minimized. We present test scenarios illustrating the impact of the suggested techniques. We explore hardware and software based methods of power reduction, assess the impact of each, the constraints to be expected and how to overcome them. We then provide a reference implementation of a gateway in which we integrate these techniques. We show that power consumption can be reduced by 48 - 85% when comparing best and worst case scenarios. The reference implementation we provide consumes 27mW at 3V.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Series
Africon, ISSN 2153-0025
Keywords
Low Power, Wireless Sensor Networks, Gateway, Contiki, Automatic Weather Station, Environment Monitoring, Internet of Things
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-224124 (URN)10.1109/AFRCON.2017.8095699 (DOI)000424741600251 ()2-s2.0-85039950984 (Scopus ID)978-1-5386-2775-4 (ISBN)
Conference
IEEE AFRICON Conference - Science, Technology and Innovation for Africa, SEP 18-20, 2017, Cape Town, SOUTH AFRICA
Note

QC 20180314

Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-03-14Bibliographically approved
Spyridonis, F., Taylor, S. J., Abbott, P., Barbera, R., Nungu, A., Gustafsson, L. L., . . . Banda, T. (2015). A study on the state-of-the-art of e-infrastructures uptake in Africa. Palgrave Communications, 1, Article ID 14007.
Open this publication in new window or tab >>A study on the state-of-the-art of e-infrastructures uptake in Africa
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2015 (English)In: Palgrave Communications, ISSN 2055-1045, Vol. 1, article id 14007Article in journal (Refereed) Published
Abstract [en]

e-Science is a pioneering method that uses integrated collections of Information and Communication Technologies (ICTs), or e-Infrastructures, to enable scientists across the world to collaboratively work on more and more ambitious projects. Have advances and access to ICTs enabled African e-Infrastructure development? This paper aims to understand the current state of e-Infrastructure uptake in Africa and present some of these initiatives across the African continent by exploring the current landscape emerging from a survey of early consumers. These initiatives are discussed in terms of key projects and user communities that they are addressing. In line with wider perceptions that e-Infrastructures will re-shape the ways research is performed, this study yielded 34 current or planned e-Infrastructure projects across 13 African countries addressing a range of research domains, and identified 7 user communities across these disciplines. Our findings suggest that the African research community is increasingly interested and involved in e-Infrastructure development activities in response to the issue of limited access to dedicated global research and education resources. The study can contribute to the ongoing discussion on how e-Infrastructures can positively promote the research, technological development and innovation potential of developing countries. 

Place, publisher, year, edition, pages
Palgrave Macmillan Ltd., 2015
National Category
Human Aspects of ICT
Identifiers
urn:nbn:se:kth:diva-236903 (URN)10.1057/palcomms.2014.7 (DOI)2-s2.0-85053126065 (Scopus ID)
Note

QC 20181211

 Funding details: 2011-7381, VR, Vetenskapsrådet; Funding details: 2013-6710, VR, Vetenskapsrådet; Funding details: eI4Africa, EC, European Commission; Funding details: 312582, EC, European Commission; Funding text: This work was partially supported by the European Commission project “Teaming-up for exploiting e-Infrastructures’ potential to boost RTDI in Africa” (eI4Africa) (no. 312582) and by grants from the Swedish Research Council (2011-7381 and 2013-6710).

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved
Olsson, R. & Pehrson, B. (2015). Powering devices using ultra-capacitor batteries. In: PROCEEDINGS OF THE 2015 12TH IEEE AFRICON INTERNATIONAL CONFERENCE - GREEN INNOVATION FOR AFRICAN RENAISSANCE (AFRICON): . Paper presented at 12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON), SEP 14-17, 2015, Addis Ababa, ETHIOPIA. IEEE conference proceedings
Open this publication in new window or tab >>Powering devices using ultra-capacitor batteries
2015 (English)In: PROCEEDINGS OF THE 2015 12TH IEEE AFRICON INTERNATIONAL CONFERENCE - GREEN INNOVATION FOR AFRICAN RENAISSANCE (AFRICON), IEEE conference proceedings, 2015Conference paper, Published paper (Refereed)
Abstract [en]

We explore the use of ultra-capacitors as backup storage for solar powered electronic devices. We discuss two use cases: routers in off-grid broadband networks consuming a few Watt and wireless sensor network nodes using a few mW when operating and a few mu W in quiescent mode. We have been testing batteries with ultra-capacitor based cells, both EDLC and LIC, in the range from 40 to 3000F. We found them viable alternatives in some applications and started long term field tests to sort out some unclear aspects regarding maximum discharge levels. Besides the traditional function of a backup battery storage in low-power applications, the very low internal resistance of capacitors make them useful also in hybrid solutions to accommodate transient needs for high currents that traditional batteries cannot deliver. Due to the low resistance, charging/discharging can be very fast. We also show how a very simple design requiring only one LIC capacitor can power a WSN mote sending at 1 packet/minute for 6 weeks on a single charge.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015
Series
Africon, ISSN 2153-0025
Keywords
Batteries, Internet of Things, Lithium Ion Capacitors, LIC, Low power systems, Ultra-capacitors, Wireless sensor networks, WSN
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-183236 (URN)10.1109/AFRCON.2015.7331869 (DOI)000369096500010 ()2-s2.0-84962616678 (Scopus ID)978-1-4799-7498-6 (ISBN)
External cooperation:
Conference
12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON), SEP 14-17, 2015, Addis Ababa, ETHIOPIA
Note

QC 20160303

Available from: 2016-03-03 Created: 2016-03-03 Last updated: 2016-09-05Bibliographically approved
Kondela, E., Nungu, A. & Pehrson, B. (2015). Status of Existing Weather Observation Station Network in Tanzania and the Possibility to Automate and Densify it. In: PROCEEDINGS OF THE 2015 12TH IEEE AFRICON INTERNATIONAL CONFERENCE - GREEN INNOVATION FOR AFRICAN RENAISSANCE (AFRICON): . Paper presented at 12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON), SEP 14-17, 2015, Addis Ababa, ETHIOPIA. IEEE conference proceedings
Open this publication in new window or tab >>Status of Existing Weather Observation Station Network in Tanzania and the Possibility to Automate and Densify it
2015 (English)In: PROCEEDINGS OF THE 2015 12TH IEEE AFRICON INTERNATIONAL CONFERENCE - GREEN INNOVATION FOR AFRICAN RENAISSANCE (AFRICON), IEEE conference proceedings, 2015Conference paper, Published paper (Refereed)
Abstract [en]

We present the status of the existing network of weather observation stations in Tanzania. The information collected to assess the challenges that should be addressed when planning to automate and densify this network is presented. We also recommend the possible sites to be considered in the densification process based on meteorological considerations. Furthermore, possible upstream links, necessary to make data from remote stations globally accessible via Internet, are suggested.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015
Series
Africon, ISSN 2153-0025
Keywords
Environmental Monitoring, Weather Station, Weather Observation Network, Upstream Links
National Category
Information Systems
Identifiers
urn:nbn:se:kth:diva-183235 (URN)10.1109/AFRCON.2015.7331954 (DOI)000369096500055 ()2-s2.0-84962592316 (Scopus ID)978-1-4799-7498-6 (ISBN)
External cooperation:
Conference
12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON), SEP 14-17, 2015, Addis Ababa, ETHIOPIA
Note

QC 20160303

Available from: 2016-03-03 Created: 2016-03-03 Last updated: 2018-01-10Bibliographically approved
Nilseng, J., Gustafsson, L. L., Nungu, A., Bastholm-Rahmner, P., Mazali, D., Pehrson, B. & Eriksen, J. (2014). A cross-sectional pilot study assessing needs and attitudes to implementation of Information and Communication Technology for rational use of medicines among healthcare staff in rural Tanzania. BMC Medical Informatics and Decision Making, 14(1), 78
Open this publication in new window or tab >>A cross-sectional pilot study assessing needs and attitudes to implementation of Information and Communication Technology for rational use of medicines among healthcare staff in rural Tanzania
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2014 (English)In: BMC Medical Informatics and Decision Making, ISSN 1472-6947, E-ISSN 1472-6947, Vol. 14, no 1, p. 78-Article in journal (Refereed) Published
Abstract [en]

Background: In resource-poor countries access to essential medicines, suboptimal prescribing and use of medicines are major problems. Health workers lack updated medical information and treatment support. Information and Communication Technology (ICT) could help tackle this. The impact of ICT on health systems in resource-poor countries is likely to be significant and transform the practice of medicine just as in high-income countries. However, research for finding the best way of doing this is needed. We aimed to assess current approaches to and use of ICT among health workers in two rural districts of Tanzania in relation to the current drug distribution practices, drug stock and continuing medical information (CME), as well as assessing the feasibility of using ICT to improve ordering and use of medicines. Methods: This pilot study was conducted in 2010-2011, mapping the drug distribution chain in Tanzania, including problems and barriers. The study was conducted in Bunda and Serengeti districts, both part of the ICT4RD (ICT for rural development) project. Health workers involved in drug procurement and use at 13 health facilities were interviewed on use and knowledge of ICT, and their attitudes to its use in their daily work. They were also shown and interviewed about their thoughts on an android tablet application prototype for drug stock inventory and drug ordering, based on the Tanzanian Medical Stores Department (MSD) current paper forms. Results: The main challenge was a stable supply of essential medicines. Drug supplies were often delayed and incomplete, resulting in stock-outs. All 20 interviewed health workers used mobile phones, 8 of them Smartphones with Internet connection. The Health workers were very positive to the tablet application and saw its potential in reducing drug stock-outs. They also expressed a great need and wish for CME by distance. Conclusion: The tablet application was easily used and appreciated by health workers, and thus has the potential to save time and effort, reduce transportation costs and minimise drug stock-outs. Furthermore, the android tablet could be used to reach out with CME programs to health care workers at remote health facilities, as well as those in towns.

Keywords
Access to medicines, Africa, Android tablet, Decision support, Health systems, ICT, iPad, Low-income countries, Rational use of medicines
National Category
Other Medical Sciences
Identifiers
urn:nbn:se:kth:diva-154391 (URN)10.1186/1472-6947-14-78 (DOI)000342095600001 ()25158806 (PubMedID)2-s2.0-84907914074 (Scopus ID)
Funder
VinnovaSwedish Research Council, VR 2011-3440 VR 2011-7381
Note

QC 20141021

Available from: 2014-10-21 Created: 2014-10-20 Last updated: 2017-12-05Bibliographically approved
Tanyingyong, V., Rathore, M. S., Hidell, M., Sjödin, P., Pehrson, B., Jonsson, S. & Groth, K. (2013). Carenet: An Infrastructure for Home-Based Healthcare Services. In: Medicinteknikdagarna 2013: . Paper presented at Medicinteknikdagarna, 1-2 oktober 2013 i Stockholm.
Open this publication in new window or tab >>Carenet: An Infrastructure for Home-Based Healthcare Services
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2013 (English)In: Medicinteknikdagarna 2013, 2013Conference paper, Poster (with or without abstract) (Refereed)
National Category
Medical and Health Sciences Communication Systems
Identifiers
urn:nbn:se:kth:diva-138338 (URN)
Conference
Medicinteknikdagarna, 1-2 oktober 2013 i Stockholm
Note

QC 20150218

Available from: 2013-12-18 Created: 2013-12-18 Last updated: 2015-02-18Bibliographically approved
Tanyingyong, V., Olsson, R., Hidell, M., Sjödin, P. & Pehrson, B. (2013). Design and Implementation of an IoT-controlled DC-DC Converter. In: 2013 Sustainable Internet and ICT for Sustainability, SustainIT 2013: . Paper presented at 3rd International Conference on Sustainable Internet and ICT for Sustainability, SustainIT 2013; Palermo; Italy; 30 October 2013 through 31 October 2013 (pp. 6685199). IEEE
Open this publication in new window or tab >>Design and Implementation of an IoT-controlled DC-DC Converter
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2013 (English)In: 2013 Sustainable Internet and ICT for Sustainability, SustainIT 2013, IEEE , 2013, p. 6685199-Conference paper, Published paper (Refereed)
Abstract [en]

In line with the shift towards renewable energy, small-scale solar panels have become commonly available. Solar panels are intermittent energy sources producing direct current, and DC-DC converters are needed to convert between different voltage levels, both for different power loads and for storing energy. DC-DC converters typically have a very limited functionality and are statically configured for specific voltage levels. In this paper, we propose a new generation of flexible DC-DC converters with software and communication support (through Contiki and CoAP) for remote power monitoring and control. We present a prototype design and implementation of a DC-DC converter including a microprocessor, a lean operating system, and networking support. With such a DC-DC converter, controlled over the Internet, we can address various types of power and energy related issues and advance the state-of-the-art of green networked applications.

Place, publisher, year, edition, pages
IEEE, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-142596 (URN)10.1109/SustainIT.2013.6685199 (DOI)000330731100013 ()2-s2.0-84893275298 (Scopus ID)978-390188256-2 (ISBN)
Conference
3rd International Conference on Sustainable Internet and ICT for Sustainability, SustainIT 2013; Palermo; Italy; 30 October 2013 through 31 October 2013
Note

QC 20140311

Available from: 2014-03-11 Created: 2014-03-07 Last updated: 2014-03-11Bibliographically approved
Nungu, A., Olsson, R. & Pehrson, B. (2012). Design and Implementation of an Inclusive Ubiquitous Access. Wireless personal communications, 67(1), 79-94
Open this publication in new window or tab >>Design and Implementation of an Inclusive Ubiquitous Access
2012 (English)In: Wireless personal communications, ISSN 0929-6212, E-ISSN 1572-834X, Vol. 67, no 1, p. 79-94Article in journal (Refereed) Published
Abstract [en]

The development towards ubiquitous network access requires innovative solutions to get remote areas included, especially rural areas of developing regions. The challenges include robustness of network components, poor or non-existent power supply and sustainable business models. We argue that large scale user-driven community networks are becoming technically viable to deploy in areas that are short of supply of telecommunication services due to little or no commercial interest. To support this claim, we discuss the design of key network elements and careful power management based on alternative energy sources and storage. We also provide a status report from ongoing field-tests regarding provisioning of broadband network services in Serengeti, Tanzania, and outline briefly our strategy to achieve sustainability. On the technical side, we first discuss an affordable, high-performance, low-effect router based on open source software and standard off-the-shelf hardware offering both copper and fibre links. Our design is capable of forwarding more than 700 kpps at 22.3 W. The power consumption is considerably less than all alternatives in our comparison. Then we discuss power management and the use of batteries and super-capacitors as backup and storage solutions.

Keywords
Ubiquitous access, Developing regions, Software routers, Green networking, Performance measurement, Alternative energies
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-105650 (URN)10.1007/s11277-012-0801-5 (DOI)000309880400006 ()2-s2.0-84867870336 (Scopus ID)
Note

QC 20121126

Available from: 2012-11-26 Created: 2012-11-23 Last updated: 2017-12-07Bibliographically approved
Nungu, A., Brown, T. & Pehrson, B. (2011). Business Model for Developing World Municipal Broadband Network - A Case Study. In: Global Information Infrastructure Symposium (GIIS), 2011. Paper presented at Global Information Infrastructure Symposium (GIIS), 2011 (pp. 1-7). Da Nang, Vietnam: IEEE
Open this publication in new window or tab >>Business Model for Developing World Municipal Broadband Network - A Case Study
2011 (English)In: Global Information Infrastructure Symposium (GIIS), 2011, Da Nang, Vietnam: IEEE , 2011, p. 1-7Conference paper, Published paper (Refereed)
Abstract [en]

A viable business model is key for the financial andoperational sustainability of community broadband network. Us-ing the public-private-partnership approach, stakeholder analysisand the business model canvas tool, we demonstrate a businessmodel that can guarantee financial and operational sustainabilityof community networks in rural developing regions. The businessmodel has been validated in a local broadband communicationnetwork built in rural Tanzania.

Place, publisher, year, edition, pages
Da Nang, Vietnam: IEEE, 2011
Keywords
Business model, Public-Private-Partnerships, Non-Governmental Organizations, Community Telecommunica- tion Networks, financial sustainability
National Category
Telecommunications
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-48396 (URN)10.1109/GIIS.2011.6026715 (DOI)2-s2.0-80053627999 (Scopus ID)978-1-4577-1262-3 (ISBN)978-1-4577-1260-9 (ISBN)
Conference
Global Information Infrastructure Symposium (GIIS), 2011
Note
QC 20111118Available from: 2011-11-18 Created: 2011-11-18 Last updated: 2011-11-25Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9626-1496

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