This page contains information that may be helpful in planning visit to Helsinki for the AIP 2015 conference. Topics include Lunch options, Accommodation, Transportation, Childcare, and NSF Travel Support

Lunch options

There are many restaurants and cafes in the city center. However, here a list of suggested places nearby:


We have negotiated favourable hotel room prices for the conference participants. When making your reservation, please mention the campaign code "AIP2015" to get your discount. Please note that there is a limited number of booked rooms. To ensure yourself a hotel of your first choice, we advise you to make your hotel reservations well in advance.

Cumulus Kaisaniemi

Kaisaniemenkatu 7, 00100 Helsinki
tel. +358 (0)9 172881 | fax +358 (0)9 605 379

Single room, Standard: 119,00 EUR / night
Double room, Standard: 129,00 EUR / night

The hotel fees include VAT, buffet breakfast and guest sauna.

Sokos hotels

Tel: +358 20 1234 600
The offer is valid until April 24, 2015, 8 p.m.

Original Sokos Hotel Helsinki
Kluuvikatu 8, 00100 Helsinki

Single Room, Standard: 130 EUR / night
Double/Twin Room, Standard: 145 EUR / night, Breakfast included

Original Sokos Hotel Presidentti
Eteläinen Rautatiekatu 4, 00100 Helsinki

Single Room, Standard: 125 EUR / night,
Double or Twin Room, Standard: 145 EUR / night, Breakfast included

Solo Sokos Hotel Torni
Yrjönkatu 26, 00100 Helsinki

Single Room, Solo: 133 EUR / night
Double Room, Solo: 148 EUR / night, Breakfast included

Original Sokos Hotel Vaakuna
Asema-aukio 2, 00100 Helsinki

Single Room, Standard: 138 EUR / night
Double or Twin Room, Standard: 153 EUR / night, Breakfast included

Hotel Arthur

Vuorikatu 19, 00100 Helsinki

Single Room, Standard: 99 EUR / night,
Twin Room, Standard: 119 EUR / night.
The room rate includes buffet breakfast and VAT.

Reservations by e-mail or, or by telephone +358-9-173 441. The sales department is open from 08 a.m. till 5 p.m. ( fridays from 08 a.m. till 4 p.m.). The offer is valid until April 24, 2015.

Hotel Ava

Karstulantie 6, 00550 HELSINKI
Tel: +358 9 774 751

May 17-30, 2015 (Summer School)

Mon-Fri :
79,00 EUR / Single Room / Night
94,00EUR / Twin Room / Night

Fri-Mon :
49,00 EUR / Single Room / Night
59,00 EUR / Twin Room / Night

8,50 EUR / Adult / Day

Offer is valid until April 17, 2015

Other options:

Omena Hotels


Pathfinder applications: Public transport route suggestions between two given locations at a given time of day can be obtained at Journey planner or at Google Maps.

Bus number 615 operates between the Airport and the City center.

Tickets: Can be bought on buses and trams from the driver. They are valid for all means of public transportation (bus, tram, metro and regional trains). It may be convenient to buy a day ticket at the HSL (Helsinki Regional Transport Authority) service office at the Central Railway Station metro station. More infos can be found at

Taxi: Can be ordered e.g. by calling Taksi Helsinki +358 100 0700 or Taksi Kovanen +358 200 6060.

Child care

We would like to encourage parents to take part to the conference. Room 1044 in the Main Building at Fabianinkatu 33 is devoted to childcare. Inside the room you will find: private space for breast-feeding, a changing table with extra-nappies provided by AIP, a sink, a microwave with extra-babyfood provided by AIP, and a high chair for feeding. The door has a code lock. Ask Paola (contact information below) or the doorman for the code.

Finland is a very children-friendly country. Every space is accessible with a pram and every restaurant provides high chairs for customers and often babyfood or kids menus.

Public transportation: Children between 0 and 6 years travel for free on buses, trams, metro and regional trains. Moreover, a parent carrying a baby on a pram/stroller travels for free. For more information, visit

Taxis and passenger cars: By law, when travelling by taxi you do not need a car seat for your baby. However, when booking a taxi in advance, you can request a car seat and there may be one available. Children accessories are rented by Lastenturva.

Babysitting services: MLL, Väestöliitto, Stella, Kodinavux

Medical assistance: Mehiläinen, Pikkujätti, Diacor

For emergencies, recall that the general emergency assistance number in Finland is 112. You can also contact the Emergency Clinic.

There are many activities for children all year long:

Amusement parks: Murulandia, Snadistadi, Helsingin Leikkiluola, Linnanmäki, Serena waterpark

Activities: Kids fitness, Visit Helsinki - events for children, Visit Helsinki - activities for the family, Annantalo Art Centre for children, Libraries Network, Megazone laser game

Museums/tours: National natural history museum, Seurasaari open air museum, Sampo puppet theatre, Korkeasaari Zoo, Tropicario, Fallkulla domestic animals farm, Gardenia - tropical garden, Haltia Nature Centre, Sea Life Acquarium,

If you need help or assistance, feel free to contact the organisers through Paola Elefante,, tel. +358 40 0217654.

NSF travel support

The NSF has very generously awarded a grant to support the travel of junior scientists (at most 6 years past the PhD) from US institutions to AIP 2015 and the Summer School the previous week.

The application consists of a cover email specifying the reason to participate in AIP, a CV and an email of a senior person familiar with the work of the applicant. These materials are to be sent to Gunther Uhlmann ( The deadline is Feb 28, 2015.

Introducing special speakers

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  • Gitta Kutyniok from TU Berlin is an expert on "sparsity-promoting" reconstruction methods. Inverse problems are about recovering objects based on measurement data which is insufficient. The data needs to be complemented with extra information about the object, such as sparsity. Sparsity means representing the object using building blocks specifically chosen so that only very few of them are needed. Professor Kutyniok often uses "shearlets" for representing images. Shearlets are versatile building blocks adapting to image details of any scale and representing edges with a variety of orientations.

    In the attached picture she applies shear let reconstruction to an inverse scattering problem, resulting in a result much improved over a traditional method. In her plenary talk at the AIP2015 conference, Professor Kutyniok gives an introduction to the theory and computational use of the shearlet transform.

  • Peter Markowich from KAUST is an expert of partial differential equations which arise from systems depending on many variables and involving change. Due to the generality of mathematics, such models apply to wildly different areas of application.

    In his Special Keynote Address, Professor Markowich discusses biological transportation networks, price formation in economic markets and fluid flow in porous matter. The picture shows models for a large crowd of people in three groups exiting a building as fast as possible. Different models of human behaviour lead to different dynamics. This is a joint work with Martin Burger, Marco Di Francesco and Marie-Therese Wolfram.

  • Peijun Li from Purdue University studies direct and inverse scattering problems. One of the central contributions in his work is the design of imaging methods accepting realistic near-field measurements (as opposed to mathematically ideal far-field patterns). In the picture is shown reconstructions of a two-dimensional shape. Here the unknown shape is probed with acoustic waves send from different directions. Various datasets are considered with limited angles of view. Observe that the "dark side" of the shape is more difficult to recover. This work is joint between Peijun Li and Yuliang Wang.

    In his plenary talk at AIP, Peijun Li will describe his recent work on achieving sub-wavelength resolution for inverse surface scattering problems.

  • Hongyu Liu from Hong Kong Baptist University knows how to recover objects from remote measurements. Below is an example of sending elastic vibrations through an unknown body, and recovering inhomogeneities (red) inside. This 2013 result is a joint work between four authors: Guanghui Hu, Jingzhi Li, Hongyu Liu and Hongpeng Sun.

    At AIP, Professor Liu will explain how to hide objects from remote sensing. Such cloaking techniques are already used widely in fiction: think Harry Potter and his invisibility cloak.

  • Xiaoqun Zhang from Shanghai Jiao Tong University is an expert in inverse problems related to image processing. Here is an example of her work (this one done jointly with Tony Chan). On the left is the original "Barbara" image. Second image from left shows many missing pixels that should be filled back in using so-called "inpainting." Third image from left shows the result of a standard baseline technique, whereas the rightmost picture shows the excellent inpainting result using a nonlocal method developed by Zhang & Chan in 2010.

  • Recent work of Thomas Schuster from Saarland University, Germany, (joint with Arne Wöstehoff) paves the way to self-diagnosing airplanes. The idea is to equip the aircraft with vibration sources and sensors. Cracks and other defects can be detected by sending vibrations along the plane, and measuring the response at the sensors.

    Prof. Schuster's plenary talk at AIP will be about vector tomography, which allows new imaging techniques in the fields of medicine, industry, oceanography, plasma physics, polarization tomography and electron microscopy.

  • Katya Krupchyk from University of California at Irvine, USA. Professor Krupchyk is an expert on mathematical models of a range of indirect physical measurements. In one of her works, joint with Matti Lassas and Samuli Siltanen, she studied an extension of the imaging method called electrical impedance tomography.

    In this work, electrical voltage-to-current measurements are preformed on the boundary of a physical body. The resulting currents flowing inside the body produce heat. The surface of the body is covered with heat flow sensors (interlaced with electrodes used for electrical measurements), providing extra information. Now the electrical and thermal measurements can be combined to yield improved information about the internal structure of the body.

  • Takashi Kako from University of Electro-Communications, Chofu-Tokyo, Japan, is an expert on resonances, and he will talk about their role in the formation of vowels in human speech. The related inverse problem is quite tricky: given a recording of a vowel sound, recover the shape of the vocal tract and the excitation signal arising from the vocal folds flapping against each other.

    Pictured are simplified vocal tract models for the five Japanese vowels: /a/, /i/, /u/, /e/, /o/.

  • Eero Saksman, University of Helsinki: Adaptive Markov chain Monte Carlo (MCMC) methods (joint with Johanna Tamminen and Heikki Haario). In Bayesian inversion, one often needs to compute high dimensional integrals (posterior mean). Due to the "curse of dimensionality" it is not a good idea to use a quadrature method.

    Instead, MCMC shoots plenty of points in the space, distributed according to the posterior probability. The average of the points is close to the integral. Now if the posterior probability has a weird shape, regular MCMC may not visit all corners of positive probability. Adaptive MCMC monitors the chain and modifies the search strategy on the fly, guiding the process to all relevant areas.