This is a (partial) list of past and present projects that I worked and work on. Some descriptions link to other pages with additional information but many don't. If you want more information on any of these subjects, then please contact me.


DynaNets logo DynaNets started June 2009 and is an EU FP7 FET open project that studies complex systems through dynamically changing networks. My involvement in this project is Twilight; an interactive visualization application to graphically explore dynamic networks.


      logo UrbanFlood started December 2009 and investigates the use of sensors within flood embankments to support an online early warning system, real time emergency management and routine asset management. My work in this projects involves the design and implementation of decision support systems for use in emergency situations.

Computer Science at Dutch High Schools

      Science class at Amsterdam high school I teach Computer Science to students from three high schools in Amsterdam. This is within the context of a project from its academy to stimulate students' interest in Computer Science. In my third year in this project I have final-year students working on one big Informatica Project (in Dutch - if that's not your tongue, try the Google translation).

UvA-MTT: the UvA Multi-Touch Table

MTT We have designed and built a multi-touch surface display which we demonstrated at SuperComputing 2008 (SC08) in Austin, TX. Our primary demonstration at the Dutch Research booth was an application that allows monitoring and control of a programmable computer network. This work was done in collaboration with the System and Network Engineering (SNE) group. For more information take a look at this poster on the design and construction of the UvA MultiTouchTable, this poster on the Interactive Networks application we showed at SC08.

General purpose computing on GPUs

GPU The rate of increase in performance of modern graphics hardware far exceeds that of CPUs. For example; the performance of NVIDIAs GeForce 8800GTX, released at the end of 2006, is 340 GFLOP/s which is roughly ten times as fast as the fastest CPU released by Intel at that time. Now that graphics processing units (GPUs) have evolved from fixed function processing pipelines to programmable parallel SIMD (Single Instruction Multiple Data) architectures, researchers have started to use their computational power for other tasks than graphics. We have worked on a GPU implementation of a direct gravitational N-body simulation for astrophysics simulations, implemented in NVIDIA's CUDA. Have a look at this poster for more information.

VL-e: the Virtual Laboratory for eScience

VL-e The Virtual Laboratory for eScience (VL-e) is a Dutch project to enhance scientific research through grid-technology. I coordinated a subprogramme on grid applications for medical imaging and diagnostics. This research consisted of partners from academia and industry, including AMC, VUmc, Philips Research, Philips Medical Systems and IBM. For more information, visit the VL-e project homepage.

WiVR: a Window into Virtual Reality

Dead cat We developed an augmented reality demonstration for the co-located visualization of virtual objects over physical objects. In one particular instance we showed a handheld tablet PC that was used to inspect a CT scan of a glass jar containing a panther cub in ethanol, lovingly called "the dead cat demo". This work done as a proof-of-concept demonstration for the VL-e project to show that it is possible to create a highly interactive visual experience using distributed computing and visualization resources. For more information, visit the WiVR page of have look at this poster.

Simulated Vascular Reconstruction in a Virtual Operating Theatre

Simulated Vascular
      Reconstruction My PhD research included many of the research areas described above into a test case to asses their viability. This environment combines interactive visualisation of patient specific vascular medical data with a flow simulation environment into an interactive exploration environments that provides a virtual operating theatre in which vascular reconstruction procedures can be simulated.
In this environment, the lattice Boltzmann flow simulation technique is used to simulate blood flow through human vascular geometry obtained from patients with vascular disease. An interactive virtual environment visualizes the results of this blood flow simulation and allows a vascular surgeon to interactively explore alternative treatments for the patient. Based on simulation results, the vascular surgeon can form a decision on which of these treatments could be best for a patient when applied in practice.