In a few words

Victor PillacI am a research scientist, currently looking for new opportunities in the Berlin Area. I hold a Ph.D. in operations research, also known as “the science of the better”. My main expertise resides in modeling complex real-world systems and developing software to assist stakeholders make better decisions. I am interested in combining data science and optimization to bridge the gap between big data and decisions support systems. [read more]

Image by Guy Hinks.

EURO EJOR Best Paper Award 2015

Our paper “A review of dynamic vehicle routing problems” received the EURO EJOR Best Review Paper Award 2015. It is the most cited EJOR article for the 2013/2014 editions according to scopus.

Full reference:

A review of dynamic vehicle routing problems, V. Pillac, M. Gendreau, C. Guéret, A. L. Medaglia, European Journal of Operational Research, 2013, 225(1), 1-11, doi:10.1016/j.ejor.2012.08.015
[technical report (free)] [download from editor]

Lightroom 5 - Geotagged pictures

Use your phone to set the location of you pictures

Being a geek with an obsessive tendency as well as a photography enthusiast can be challenging when you travel for a while. Even when you are back home, and no longer have to struggle to find a power plug or a wifi hotspot with a decent bandwidth to get your internet fix, you still face a pile of pictures that you would like to sort and classify in a neat structured way. And what better way to tell the story of your trip than to put your photos on a map?

You may be the lucky one who has a GPS enabled camera, if not, read on to learn how to geotag your pictures using an everyday device that spies on you from your pocket: your smartphone.

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Mt Kinabalu overlooking rice fields

Borneo express

Borneo. The name of this island split between three countries immediately evokes images of jungle, white beaches, and adventure. Yet Kota Kinabalu, entry point of Sabah, the Malaysian province north of the island, is far from the laid back tropical city we had imagined. The city seems to have little to offer apart from it’s lively market  and numerous outdoor restaurants that sprawl in front of the resting fishing boats. A short boat trip brings you to a few nearby islands where one can enjoy a cleaner water. We pick Manukan which turns out to be one of the less crowded beaches (which may be due to the entrance fee charged on arrival).

We had thought of climbing Mt Kinabalu, and heard that it was possible to by-pass the travel agencies by going directly to the park entrance and arranging a guide there. Unfortunately, we now only have a week in Borneo which limited our options. On the recommendation of a raw vegan traveller, we decide to head to Ranau, a small town near Mt Kinabalu, surrounded by rice fields and forest,under the majestic protection of the mountain. We enjoy a short walk in Mt Kinabalu park, have our feet thoroughly cleaned by hungry fishes, and wander around the local to discover new fruits and vegetables.

Mt Kinabalu overlooking rice fields

Mt Kinabalu overlooking rice fields

Bags of langsat fruits at the Ranau market

Bags of langsat fruits at the Ranau market

Further east, we join buses of tourists to watch the Orang-Outans being fed in the Sepilok sanctuary. The sanctuary was created to reintroduce Orang-Outans in the wild. After spending their early years in the nursery where they learn to climb trees and feed, the young are released into the forest. Twice daily, a feast of bananas is offered to them on a platform, attracting a handful of monkeys, and hundreds of humans. This simple diet is meant to bore them, creating an incentive to go gather their own food. Hence the fewer Orang-Outans come, the better indicator of success of the program. It also means more leftovers for other opportunistic monkeys and squirrels that clean up the platform once they have left.

Not exactly what we expected in a

Not exactly what we expected in a “wildlife sanctuary”

I leave Borneo feeling that our visit was too short to really see what the island had to offer, and also with the impression that Sabah is not exactly made for independent travelers, especially when on a budget. Most attractions and remote area seem to be only accessible by organized tours, with limited do-it-yourself alternatives.

Looking at Mt Kinabalu


From Kuala Lumpur to Singapore and back

I land in busy Kuala Lumpur on Sunday Februrary 8. The scent of Melbourne is quickly replaced by the smog covering the painful goodbyes. It’s refreshing to be able to cross roads anywhere without fearing a fine, and to see masses of people in the streets at any time of the day or the night. China town, Petalling Street, food stalls, a visit to the Petronas Towers… big asian cities always remind me of Bogota. The apparent chaos -which may only be a different form of organization-, the traffic jams, the noise, quickly make me want to move on.


Foodcourt in Kuala Lumpur (Chinatown)

Our plan is to go to Borneo via Singapore. We take a bus from Pudu Sentral station, but in the confusion end up in a non-direct service that will take more than 7h to arrive in Singapore. I had visited the Lion City a year earlier so not much had changed, it is still this very organized city at the crossing of cultures. We opt to stay in China town and make the most of it by strolling in the busy night market. As a tourist, Singapore does not have much to offer, the heat and large streets make you seek air-conditioned spaces, from the over-priced coffee shops to the cheesy gondolas of Marina Bay Sands mall. Still, it is a city that has a palpable energy and undeniable attraction power, especially if you can afford to live there for a while and watch the sunset from the Kudeta deck.


Nightmarket in Sinapore Chinatown

“Sorry, we cannot let you board the plane if your passport expires in less than 6 months” – says the man at AirAsia check-in counter. A call to AirAsia offices and to the Malaysia immigration department confirm the situation: no flying to Borneo today for my compagnon de voyage. We have no other option but to go to the embassy to obtain a temporary passport. Seeing the cost of staying in Singapore and the limited attractions, we decide to head back to Malaysia, catching a (direct) night bus to Kuala Lumpur, going straight to the embassy and then to Malacca to wait for the bureaucracy to do its work.

At less than 2h from Kuala Lumpur, Malacca appears as another crawling mass of concrete. At its center though, is a charming old city with narrow streets leading to landmarks from the colonial era. We stay at Jalan-Jalan, one block away from the Jonker street night markets, and the picturesque riverside with it’s cafes and cruise boats. As the sun rises, the call to the prayer covers the roofs of the small colonial houses. In a half sleep, the song of the Muezin awakes a feeling of melancholia, drawing images of the vibrant commerce hub that Malacca once was. Here merchants from Europe, China, the Middle  East, and Asia used to meet and trade their most precious goods. Here muslim preachers started the conversion of this part of the world to Islam. But Islam is not the only religion in Malaysia. Different ethnic groups practice  their cult in an apparent harmony. Walking in one street takes you from two Chinese temples to a Mosque, from a Mosque to a Hindu temple, from a Hindu Temple to a Church accross the river, and from a Church to a Hard Rock Coffee. All gods of heaven and rock’n roll have a shrine in this small strip of land.


Malacca riverside

At night (on weekends) the Jonker street fills with stalls selling everything from energyzing shower head to delicious street food. On a large stage at the end, the local third-age club organizes a Karaoke. Gran’pas and Gran’mas take turn on the microphone to sing classic chinese songs to a captivated audience. The next day a local pop dance club takes the stage as teenagers break some moves on pumping pop music. Contrasts.


Mr. Soon's cat bar

Locals and tourists share beers at Soon’s bar, where photo-collage of cats cover the walls, chairs are pulled on the street, and cheap cans of beer flow from the fridge, all under the calm supervision of Mister Soon, who surprisingly speaks swiss-german. In this bar, Victor met Matt, the writer of Mostly Non Fiction, a blog “about [Matt’s] travels, all in third person”. Victor cannot help to make parallels between Matt’s story and his. Consultant in big data, Matt has taken some time off to travel the world, write, and pursue is passion for origami. We also meet Ross and Jonathan, two brothers from the UK on a mission to connect Northampton UK, to Northampton Australia, without taking a plane, which resonates with my own dream of returning from Melbourne to Europe by land, and the Great Railway Bazar book I am reading. And what to say of Julien and Marion, who come from a little toown a few kilometres away from where I grew up?

The path you follow seems to define the people you meet. Follow what is naturally attractive to you and you will met like-minded people.