Monday, November 30, 2015

Memories of 2013

The pair of train tickets to Porto, from Lisboa
This year resembled 2013 in many ways. I visited Stockholm again after 2013. Similarly, I also returned to Sri Lanka, 2 years after my last visit in 2013. This time during my visit to Colombo, I was taking a few of my clothes back with me to Portugal since I could not take them with me at the last moment in 2013 to Stockholm from Colombo, as at the Colombo airport the Qatar Airways staff was too strict in the luggage allowance.

Going through my things untouched for a long time brought back some old memories. Among them was a pair of train tickets I found in a pocket in one of my winter suits. Those were the train tickets to Porto Campanha train station from  Lisboa Oriente. I have been to Porto only once, that was in 2013. Porto is a beautiful city. But for some unknown reason, I did not go there once more after 2013.

I had come back to Lisbon from Porto just 2 days before my departure to Colombo, completing my first half of EMDC in Lisbon. It was all good and sad memories, leaving Lisbon. Little did I know that I will in fact spend many more years in Portugal, that time. Right now, I am continuing the second year of my PhD in Lisbon, the 4th year of my stay in Portugal.

Sunday, November 29, 2015

White Chocolate Wine..

White Chocolate Wine and Coffee Wine.

Everyone loves white chocolate. Everyone loves Porto Wine. How is it to have a Chocolate Wine? Enjoying the weekend with some! :) It is 12% alcohol, but does not feel like alcohol at all, thanks to the white chocolate in it. It looks and feels like milk. :D I have not tried the coffee one yet. It will be next. :D

Prisoners of Time

I recently watched this amazing video. "Otis Johnson went to jail at the age of 25. When he got out at 69, he rejoined a world that was starkly different from the one he remembered. This is his story."

We often have strong memories when we go back to a place that we have enjoyed before. This year, I had the opportunity to go back to Stockholm after 2 years. Lots of memories. I, in fact, went to Stockholm twice. The second time I went to both Stockholm and Fejan. However, both times I failed to go to Kista, the place where I stayed for 4.5 months, during my entire stay in Stockholm. Our student apartments were located on top of a shopping center. Almost all the shops in the shopping center would close at 9 pm, which I dearly disliked. Other than that, we enjoyed an instant shopping whenever we wanted to. We did not have to walk for shopping.

As I was enjoying Farsta, Stockholm city centre, and Stockholm old city, Kista somehow slipped to the last of the to-visit list. Now, Kista has come back to the top of my places to go when I go back to Stockholm in the future. This is all to re-create the memories of 2013. I can feel the bittersweet feeling Otis faces in the above video. Losing freedom to stay in prison is harsh. While not judging his action and the judgement as that is neither my duty nor the intent of this blog post, I admire the way he expresses himself. This video has become quite popular and viral. I truly hope Aljazeera shares revenue from this video with him. He was quite entertaining and his voice was soothing to listen.a

Friday, November 27, 2015

The Third OpenDaylight Lisboa Meetup

This time we had the OpenDaylight Lisboa meetup at FCUL, Lisbon. We had a productive discussion, and I learned a lot from the fellow researchers at FCUL. Given below is the introductory presentation slides I prepared for the meetup.

Friday, November 20, 2015

Cassowary: Middleware Platform for Context-Aware Smart Buildings with Software-Defined Sensor Networks

Today I presented my work** at FCUL - the Faculty of Science, Universidade de Lisboa. Though I have presented my work in conferences, this was the first time I presented my work in another university in Portugal. I have always enjoyed presenting in different universities when I was in Sri Lanka. However, this marked my first in Portugal, ever since I left Sri Lanka in 2012. I always enjoyed visiting other universities (the universities that I am not studying). I have previously been to ISCTE-IUL, and today it was FCUL. Visiting new universities is like invading a new country. ;) I loved my audience - it was interactive and I learned a lot from the audience myself!

** Kathiravelu, P., Shari , L., & Veiga, L. (2015). Cassowary: Middleware Platform for Context-Aware Smart Buildings with Software-De ned Sensor Networks . In 2nd Workshop on Middleware for Context-Aware Applications in the IoT (M4IOT 2015), co-located with ACM/USENIX/IFIP Middleware 2015 . Dec.2015. Pages 1 - 6.

Smart devices sense the environment through their sensors and leverage the contextual information derived from the sensor readings to satisfy system requirements such as energy and carbon efficiency and user preferences. Smart buildings compose of smart devices, and local sensors of the devices and device controllers in a coordinated network. Software-Defined Networking (SDN) offers a centralized view of the entire networking data plane elements to a logically centralized controller. While smart buildings and ubiquitous computing are heavily researched, later advancements in networking are not exploited in achieving tenant-aware smart buildings.

This paper describes the research for the design, prototype implementation, and preliminary assessments of Cassowary, a middleware platform for Context-Aware Smart Buildings with Software-Defined Sensor Networks. By extending SDN paradigm and leveraging the message oriented middleware protocols to seamlessly connect the smart devices of the buildings to the centralized SDN controller, Cassowary enables context-aware Software-Defined Smart Buildings.