Schneider, R., Resch, M.M.: Calculation of the Discrete Effective Stiffness of Cancellous Bone by Direct Mechanical Simulations. In: Garbey, M., Bass, B.L., Berceli, S., Collet, C., und Cerveri, P. (Hrsg.) Computational Surgery and Dual Training. S. 351-361. Computational Surgery and Dual Training (2014).
Helwig, P., Hindenlang, U., Hirschmüller, A., Konstantinidis, L., Südkamp, N., Schneider, R.: A femoral model with all relevant muscles and hip capsule ligaments. Computer Methods in Biomechanics and Biomedical Engineering.16,669-677 (2013).
Kipp, A., Schneider, R., Schubert, L.: Encapsulation of Complex HPC Services. In: Rückemann, C.-P. (Hrsg.) Integrated Information and Computing Systems for Natural, Spatial, and Social Sciences. S. 153--176. Integrated Information and Computing Systems for Natural, Spatial, and Social Sciences, Hershey, PA, USA (2013).
Developing and providing complex IT services typically enforces the cooperation of several experts from different domains. Beside the domain specific knowledge of every involved expert this typically enforces a profound knowledge of the underlying IT service infrastructures. In this chapter, the authors show how a complex (HPC) IT service product can be provided in an easy-to-use fashion via a service virtualisation infrastructure by referring to a complex medical simulation use case. In particular, they highlight how such a complex IT service can be integrated in a holistic virtual organisation environment and show how different experts from different domains can concentrate on their specific domain whilst being enabled to take advantage of the services provided by other experts / domains in a SOA like fashion.
Schneider, R.: Storage and Indexing of Fine Grain, Large Scale Data Sets. In: Resch, M.M., Bez, W., Focht, E., Kobayashi, H., und Kovalenko, Y. (Hrsg.) Sustained Simulation Performance 2013. S. 89-104. Sustained Simulation Performance 2013 (2013).
Schneider, R., Hindenlang, U., Copf, P.: Dynamic Finite Element Analysis of Cancellous Bone Micro Structure. In: Krause, E., Shokin, Y., Resch, M., Kröner, D., und Shokina, N. (Hrsg.) Computational Science and High Performance Computing IV. S. 339-347. Computational Science and High Performance Computing IV (2011).
Schneider, R.: Identification of Anisotropic Elastic Material Properties by Direct Mechanical Simulations: Estimation of Process Chain Resource Requirements. In: Resch, M., Benkert, K., Wang, X., Galle, M., Bez, W., Kobayashi, H., und Roller, S. (Hrsg.) High Performance Computing on Vector Systems 2010. S. 149-159. High Performance Computing on Vector Systems 2010 (2010).
Helwig, P., Faust, G., Hindenlang, U., Hirschmüller, A., Konstantinidis, L., Bahrs, C., Südkamp, N., Schneider, R.: Finite element analysis of four different implants inserted in different positions to stabilize an idealized trochanteric femoral fracture. Injury.40,288 - 295 (2009).
Biomechanical analysis of the ideal placement of new intramedullary implants for stabilization of trochanteric fractures is not currently available. The aim of the presented study is to determine to what extent four intermedullary nails (Gliding-Nail, Gamma-Nail, PFN-A and Targon-PF), inserted in different positions, differ mechanically. A proximal femur was reconstructed on the basis of clinical \CT data as a surface model. Load application equivalent to the one-leg stance phase during gait was assumed, taking into account a limited number of active muscle forces. The four implants were inserted cranially and caudally into the bone structure and a model of a trochanteric fracture was created. Criteria with point ratings were introduced to quantify a favourable fracture healing situation. Finite element simulation showed clear differences between the different implants with regard to the distributions of stress and strain at the two fracture surfaces in the model and the von Mises stress in the implant itself. It was apparent for three implants under investigation that the caudal position generated better fracture healing conditions than the cranial position. Only the Targon \PF demonstrated better fracture healing conditions in the cranial position. Evaluation based on the point rating system revealed that the caudal position was the ideal position for the PFN-A, Gamma-Nail and Gliding-Nail. The Targon-PF demonstrated some advantages over the other implants in the caudal position.
Schneider, R., Faust, G., Hindenlang, U., Helwig, P.: Inhomogeneous, orthotropic material model for the cortical structure of long bones modelled on the basis of clinical CT or density data. Computer Methods in Applied Mechanics and Engineering.198,2167 - 2174 (2009).
For the simulation of stabilisation systems in femoral fractures with finite elements three factors are essential: (1) the geometry of the bone, (2) the loading of the acting muscle forces in combination with the body weight and (3) the inhomogeneously distributed orthotropic behaviour of the bone material must be known. This study will focus on the third condition. A technique is presented for transferring the density distributions gained from clinical computer tomographies to inhomogeneous, orthotropic material distributions suitable for finite element calculations. First, the algorithm for determining the orthotropy directions from the local variation of the density field is explained phenomenologically. Subsequently, a function for setting up the orthotropic elasticity matrices from the absolute \CT field values is derived. Finally, the validation procedure for the cortical bone is presented in principle.
Schneider, R., Faust, G., Hindenlang, U., Resch, M.M., Helwig, P.: Finite element analysis of a bone-implant system with comparison of isotropic and orthotropic material models generated by means of clinical CT-data.The Finite Element Method in Biomedical Engineering, Biomechanics and Related Fields. S. 71-85. The Finite Element Method in Biomedical Engineering, Biomechanics and Related Fields, Albert-Einstein-Allee 11 D-89081 Ulm (2008).
Schneider, R.: Modellierung des inhomogenen orthotropen Materialverhaltens der kortikalen Femurstruktur auf der Basis klinischer CT- bzw. Dichte-DatenUniversität Stuttgarthttps://puma.ub.uni-stuttgart.de/documents/67bd659c2b168a03f4c69bd4f527bc31/ralfschneider/Studienarbeit-Ralf_Schneider.pdf (2007).