On 29 August, the 4th International Workshop on Downscaling the Semantic Web (Downscale2016) was held as a full-day workshop in Amsterdam co-located with the ICT4S conference. The workshop attracted 12 participants and we received 4 invited paper contributions, which were presented and discussed in the morning session (slides can be found below). These papers describe a issues regarding sustainability of ICT4D approaches, specific downscaled solutions for two ICT4D use cases and a system for distributed publishing and consuming of Linked Data.. The afternoon session was reserved for demonstrations and discussions. An introduction into the Kasadaka platform was followed by an in-depth howto on developing voice-based information services using Linked Data. The papers and the descriptions of the demos are gathered in a proceedings (published online at figshare: doi:10.6084/m9.figshare.3827052.v1).
During the discussions the issue of sustainability was addressed. Different dimensions of sustainability were discussed (technical, economical, social and environmental). The participants agreed that a holistic approach is needed for successful and sustainable ICT4D and that most of these dimensions were indeed present in the four presentations and the design of the Kasadaka platform. There remains a question on how different architectural solutions for services (centralized, decentralized, cloud services) relate to eachother in terms of sustainability and when a choice for one of these is most suited. Discussion then moved towards different technical opportunities for green power supplies, including solar panels.
The main presentations and slides are listed below::
Downscale2016 introduction (Victor and Anna) (slides)
Jari Ferguson and Kim Bosman. The Kasadaka Weather Forecast Service (slides)
Aske Robenhagen and Bart Aulbers. The Mali Milk Service – a voice based platform for enabling farmer networking and connections with buyers. (slides)
Anna Bon, Jaap Gordijn et al. A Structured Model-Based Approach To Preview Sustainability in ICT4D (slides)
Mihai Gramada and Christophe Gueret Low profile data sharing with the Entity Registry System (ERS) (slides)
[This post is based on the Information Sciences MSc. thesis by Onno Valkering]
To make widespread knowledge sharing possible in rural areas in developing countries, the notion of the Web has to be downscaled based on the specific low-resource infrastructure in place. In this paper, we introduce SPARQL over SMS, a solution for exchanging RDF data in which HTTP is substituted by SMS to enable Web-like exchange of data over cellular networks.
The solution uses converters that take outgoing SPARQL queries sent over HTTP and convert them into SMS messages sent to phone numbers (see architecture image). On the receiver-side, the messages are converted back to standard SPARQL requests.
The converters use various data compression strategies to ensure optimal use of the SMS bandwidth. These include both zip-based compression and the removal of redundant data through the use of common background vocabularies. The thesis presents the design and implementation of the solution, along with evaluations of the different data compression methods.
The application is validated in two real-world ICT for Development (ICT4D) cases that both use the Kasadaka platform: 1) An extension of the DigiVet application allows sending information related to veterinary symptoms and diagnoses accross different distributed systems. 2) An extension of the RadioMarche applicationinvolves the retrieval and adding of current offerings in the market information system, including the phone number of the advertisers.
For more information:
Download Onno’s Thesis. A version of the thesis is currently under review.
[This post is based on Andre Baart’s B.Sc. thesis. The text is mostly written by him]
In developing (rural) communities, the adoption of mobile phones is widespread. This allows information to be offered to these communities through voice-based services. This research explores the possibilities of creating a flexible framework (Kasadaka) for hosting voice services in rural communities. The context of the developing world poses special requirements, which have been taken into account in this research. The framework creates a voice service that incorporates dynamic data from a data store. The framework allows for a low-effort adaptation to new and changing use cases. The service is hosted on cheap, low-powered hardware and is connected to the local GSM network through a dongle. We validated the working and flexibility of the framework by adapting it to a new use case. Setting up this new voice server was possible in less than one hour, proving that it is suitable for rapid prototyping. This framework enables further research into the effects and possibilities of hosting voice based information services in the developing world. The image below shows the different components and the dataflow between these components when a call is made. Read more in Andre Baart‘s thesis (pdf).
All information on how to get started with Kasadaka can be found on the project’s GitHub page: https://github.com/abaart/KasaDaka
Text in italics only takes place when setting up the call.
Asterisk receives the call from the GSM dongle, answers the call, and connects it to VXI. Asterisk receives the user’s input and forwards it to VXI.
VXI requests the configured VoiceXML document from Apache. VXI requests the configured VoiceXML document from Apache. Together with the request, it sends the user input.
Apache runs the Python program (based on Flask), in which data from the triple store has to be read or written. Python sends the SPARQL query to ClioPatria.
ClioPatria runs the query on the data present, and sends the result of the query back to the Python program.
Python renders the VoiceXML template. The dynamic data is now inserted in the VoiceXML document, and it is sent back to VXI.
VXI starts interpreting the VoiceXML document. In the document there are references to audio files. It sends requests to Apache for the referenced files.
Apache sends a request for the file to the file system.
The file is read from the file system.
Apache responds with the requested audio files.
VXI puts all the audio files in the correct order and plays them back sequentially, sending the audio to the GSM dongle.
Downscale2016 follows success of previous Downscale workshops and will mostly focus on appropriate infrastructures. Instead of using large-scale centralised approaches to data management we look at breaking data-centric architectures into smaller components that consume less electricity, be cheaper to own, and more flexible than a “big server” while still mimicking, as a swarm, the features one such big server would provide. As such, the workshop matches ICT for Development (ICT4D) goals with ICT for Solutions (ICT4S) and we expect that the dialogue between ICT4S, Semantic Web and ICT4D researchers and practitioners will further each of the research fields.
We are currenty inviting both short papers (6 pages) or abstracts (2 pages) describing current or latebreaking research in ICT4D. These papers will undergo a light review procedure. For more information, visit the workshop web page.
During the workshop, which was attended by around 25 AOPP members from all over Mali, we followed up on the results of a previous workshop in 2015, where we co-developed a number of use cases around improving the lives of rural farmers in Mali. Specifically, we developed two prototypes services accessible using simple mobile phones:
An online marketplace for seeds. Farmers can call in to the system to place offerings of seeds or browse current offers of seeds of various quality levels in a specific region.
A chicken vaccination service. For this service, an extension worker can register newly born chickens in the system. The system keeps an administration of when farmers need to vaccinate their chickens against specific diseases. The system then calls the farmer and plays a reminder message in his/her language.
These services were developed on Kasadaka, the cheap and low-resource rapid-prototyping platform for knowledge-rich and voice-accessible services. During the workshop we were able to further test the Kasadaka in the field. A field trip to local farmers and a milk cooperation in nearby Ouelessebougou gave us further context and information in how these services can support locals (see also the video embedded below). Chris van Aart from 2coolmonkeys demonstrated his progress on the Senepedia wiki and two Android applications that allow farmers and organizers to use geo-services to count cows, trees or other objects in the field.
In addition to these two services, we also presented seven services on the Kasadaka, developed by students of the VUA ICT4D M.Sc. course. These included a weather information service, two vetirenary services, general-purpose knowledge sharing platforms, farmer alert services and a milk market. These services were all very well received and allowed the workshop participants to really see the full potential of voice-enabled information services.
The presentation below shows more information, my personal highlights from the workshop (hence the title) as well as feedback received on the seven student projects.
On 6 April 2016, the Third International Symposium “Perspectives on ICT for Development (ICT4D)” was hosted by the VU Network Institute, the Netherlands Research School for Information and Knowledge Systems SIKS, the Computer Science Department and VU International Office. This year’s theme was “Community Service & Education”. A great team of invited speakers from India, Ghana, South-Africa and the Netherlands discussed the merits, challenges and research agendas for ICTs for Development, presenting case studies from various contexts: rural development, health, and education.
The symposium showed different technical solutions, including mobile technologies and small and cheap hardware to cope with local contexts in developing countries. Different speakers also discussed bottom-up methodologies designed for the local context to discover and co-develop interesting ICT solutions and services.
You can watch the entire event through the recorded livestream as presented below. Speakers presented in blocks of 2 around a single topic or location and engaged in discussion after the second speaker. We here present a list of speakers, their timestamp in the recording (including a direct link) as well as PDF slides for their presentations (all rights remain with the original authors).
0.00 Welcome by Symposium Chairs Victor de Boer and Anna Bon (Vrije Universiteit Amsterdam) [Slides: Victor Introduction]
During the four-day workshop, we demonstrated a number of applications developed in the context of our W4RA research, including the VOICES demonstrators, Mr Jiri and the Kasadaka voice platform which was based on a Raspberry Pi. We also showed the DigiVet application developed by Gossa Lo. In a number of breakout sessiosn, the AOPP members then developed a number of new use cases. These included an information system for seed information. In various locations in Mali, farmers develop and enrich seeds (sesame, sorghum, etc.) and sell these to other farmers. These seeds are adapted to fit the local soil and climate. To improve the effectiveness of this seed information, better sharing of this information is required. Other ideas included a veterinarian service and a marketplace application.
To deepen our understanding of the use cases and the local context, we visited a “Champs Ecole” (testing field) where new types of sesame and sorghum plants and new planting strategies were monitored. We also visited an organisation “Femmes en action” who organize trainings for local women on how to fabricate products out of raw plant materials, such as Baobab-bonbons and the always-delicious Bissap (Hibiscus lemonade). The head of the group, Fatim, was a very inspiring lady and she also showed us tubs full of fish that could be farmed in town residencies. We even got to take home some of the produced dried fish flakes.
The final day we demonstrated a number of applications. Specifically, we showed a very early prototype of a voice-accessible seed market, as was explored in the workshop. For this, we used Kasadaka as the rapid-prototyping platform. It fulfilled its purpose quite well as the farmers were triggered by this demonstration ad provided valuable feedback and questions to further specify the use case and requirements. Of course, we are still running into some issues, specifically with regestering key presses (DTMF) on the Malian network. We also showed Senepedia.org, a wiki for agriculture (sene, in the Bambara language). In the next months, the AOPP staff will experiment with this wiki to register and share information that concerns their members.
All in all, this was a very successful and inspiring meetup and we are looking forward to going back to Mali in the beginning of next year with new prototypes and demonstrations.