Sebastian Ritterbusch

HiFlow 3 : A Hardware-Aware Parallel Finite Element Package

The goal of this paper is to describe the hardware-aware parallel C++ finite element package HiFlow3. HiFlow3 aims at providing a powerful platform for simulating processes modelled by partial differential equations. Our vision is to solve boundary value problems in an appropriate way by coupling numerical simulations with modern software design and state-of-the-art hardware technologies. The main functionalities for mapping the mathematical model into parallel software are implemented in the three core modules Mesh, DoF/FEM and Linear Algebra (LA). Parallelism is realized on two levels. The modules provide efficient MPI-based distributed data structures to achieve performance on large HPC systems but also on stand-alone workstations. Additionally, the hardware-aware cross-platform approach in the LA module accelerates the solution process by exploiting the computing power from emerging technologies like multi-core CPUs and GPUs. In this context performance evaluation on different hardware-architectures will be demonstrated.

Hapto-acoustic scene representation

The use of the Phantom Omni force feedback device combined with sonification is evaluated in applications for visually impaired people such as medical engineering, numerical simulation, and architectural planning.

Aortic coarctation simulation based on the lattice boltzmann method: benchmark results

We investigate a patient specific blood flow simulation through a transverse aortic arch with a moderate thoracic aortic coarctation, where particular attention is paid to the blood pressure gradient through the coarctation. The challenge in this context is the complex geometry containing a stenosis, which results in complex flow patterns. The fluid is assumed to be incompressible and Newtonian. Its dynamic is usually described by an Navier-Stokes equation with appropriate boundary conditions. Instead, we modeled the problem mesoscopically by a family of BGK-Boltzmann equations those solutions reaches that of a corresponding Navier-Stokes system in a certain limit. For discretization we take advantage of lattice Boltzmann methods, which are realized within the open-source library OpenLB. A realistic transient flow profile of the cardiac output for a human at rest was used to specify the inflow boundary condition at the aortic root, whereas the outflow at the descending aorta was modeled by a pressure boundary condition. A short introduction to lattice Boltzmann methods is provided and especially the used boundary conditions are introduced in detail. The exact simulation setup is stated and the obtained results are discussed.

Camassia: Monocular Interactive Mobile Way Sonification

Real-time camera image analysis informs the walking person about the way in front by sonification. For visually impaired people, this opens a new way to experience their surroundings and move more safely outdoors. We extended an image analysis workflow from autonomous robots to human interaction, adaption to alternating way appearance, and various sonification options. The solution is available on off-the-shelf smartphones.

Modular Human-Computer Interaction Platform on Mobile Devices for Distributed Development

For people with visual disabilities, mobile devices have become an indispensable part for independent and self-determined living. Increasing performance of mobile devices and availability of mobile sensors and actors can improve the usability and applicability of mobile solutions. The wide range of modalities available for communication and interaction with mobile devices increase the gap between Human-Computer Interaction (HCI) research and actual implementation on mobile devices. We propose the use of a Domain Specific Language to enable the distributed development of modular and individually adaptable HCI implementations on an improving and exchangeable mobile platform.

Robust and Incremental Pedestrian Path Network Generation on OpenStreetMap for Safe Route Finding

Automatic route finding is an indispensable service in today’s life. As so far, route finding is most used for car navigation, available map data is largely missing information specific to the needs of pedestrians. This is much worse for mobility impaired pedestrians, that need to find safer routes avoiding dangerous crossings. This paper introduces a robust, incremental, and transparent extension of the OpenStreetMap way network to enable the analysis for safe route finding, and its application to safer route finding for pedestrians with visual disabilities.

Risk Analysis For Catheter Guided Aortic Valve Implantation

The assessment process of the risks which could fac e the surgeons during the replacement of the severe st notic aortic valve still needs a lot of research and s tu ies. In order to achieve this assessment the amo unt of available data and information (X-Ray and CT-Images) has to be classified and read on the light of its infl uence on the success percentage of the operation. In this paper, about 32 cases of catheter guided he art valve implantations were analyzed, which are al most 13% from the total number of operations per year (2 50 operations annually). Some parameters which were considered to be very important in predicting the o ccurred risks in case of the incorrect estimation w ere further analyzed. These parameters were the size and the ty pe of the suitable implanted valve for each patient , in addition to the volume of the total calcification in th e level of the aortic valve besides the calcificati on’s volume of each cusp. This study was conducted by the use of three differ ent medical viewing programs. ITK-SNAP software was used for segmenting the aortic valve and its calcif ication, where Aeskulap software was used for analy zing the X-Ray images of each operation and Paraview softwar e was used for visualizing the obtained segmentatio . Some of the extracted results in this thesis could explain the reasons of some complications and risks .