Christos Tsolakis

• Doctor of Philosophy
• Senior R&D Scientific Software Developer at Kitware, Inc.

https://www.esofia.net/vivlio/pliroforiki/latex-0 Στη δεύτερη έκδοση, το βιβλίο εμπλουτίστηκε με πληθώρα νέων παραδειγμάτων σε κάθε κεφάλαιο. Επιπλέον, έγιναν προσθήκες νέων ενοτήτων, όπως η παρουσίαση του Overleaf, του ChatGPT, του πακέτου lorem ipsum, των posters, και αρκετών ακόμα. Στόχος μας πάντοτε είναι ο αναγνώστης να πιάσει αυτό το βιβλίο...

Efficient and robust anisotropic mesh adaptation is crucial for Computational Fluid Dynamics (CFD) simulations. The CFD Vision 2030 Study highlights the pressing need for this technology, particularly for simulations targeting supercomputers. This work applies a fine-grained speculative approach to anisotropic mesh operations. Our implementation ex...

This paper compares three finite element-based methods used in a physics-based non-rigid registration approach and reports on the progress made over the last 15 years. Large brain shifts caused by brain tumor removal affect registration accuracy by creating point and element outliers. A combination of approximation- and geometry-based point and ele...

Current neurosurgical procedures utilize medical images of various modalities to enable the precise location of tumors and critical brain structures to plan accurate brain tumor resection. The difficulty of using preoperative images during the surgery is caused by the intra-operative deformation of the brain tissue (brain shift), which introduces d...

Current neurosurgical procedures utilize medical images of various modalities to enable the precise location of tumors and critical brain structures to plan accurate brain tumor resection. The difficulty of using preoperative images during the surgery is caused by the intra-operative deformation of the brain tissue (brain shift), which introduces d...

This paper presents a new design of the Parallel Runtime Environment for Multi-computer Applications (PREMA). This framework provides large-scale applications with one-sided communication, remote method invocations and a global namespace on top of transparent object migrations for implicit load balancing, scheduling, and latency hiding through an e...

Handling the ever-increasing complexity of mesh generation codes along with the intricacies of newer hardware often results in codes that are both difficult to comprehend and maintain. Different facets of codes such as thread management and load balancing are often intertwined, resulting in efficient but highly complex software. In this work, we pr...

Computational fluid dynamics (CFD) has become critical to the design and analysis of aerospace vehicles. Parallel grid adaptation that resolves multiple scales with anisotropy is identified as one of the challenges in the CFD Vision 2030 Study to increase the capacity and capability of CFD simulation. The study also cautions that computer architect...

Objective: In image-guided neurosurgery, co-registered preoperative anatomical, functional, and diffusion tensor imaging can be used to facilitate a safe resection of brain tumors in eloquent areas of the brain. However, the brain deforms during surgery, particularly in the presence of tumor resection. Non-Rigid Registration (NRR) of the preoperati...

https://www.esofia.net/vivlio/pliroforiki/latex Το βιβλίο αυτό αποτελεί μια σύντομη άλλα πλήρη εισαγωγή στο πρόγραμμα LATEX. Η LATEX είναι ένα πρόγραμμα στοιχειοθεσίας κείμενου που αναπτύχθηκε με στόχο τη δημιουργία ευανάγνωστων επιστημονικών κείμενων. Στο παρόν βιβλίο, θα καλυφθούν όλες οι σημαντικές πληροφορίες που θα χρειαστεί ένας νέος χρήστη...

A parallel approach for topological transformations for local reconnection methods is presented. The proposed scheme combines known parallel techniques like data overdecomposition and load balancing with widely used topological transformations, which are also known as flips or swaps. The parallel scheme is evaluated on a variety of aerospace config...

In this work, a mesh adaptation tool is loosely coupled with a metric based error estimator and a CFD solver into a computational pipeline. The pipeline is validated using a laminar flow over a delta wing. Drag and lift coefficients are computed and compared to similar simulations from the literature. The proposed anisotropic adaptation method deli...

In this work, CDT3D an in-house developed isotropic mesh generator is extended to include metric based mesh adaptation. Mesh operations perform the same topological transformations but all criteria are evaluated in a transformed space. Details on the required modifications at each meshing step are included as well an evaluation of the new method on...

In this paper, we present a scalable three-dimensional hybrid parallel Delaunay image-to-mesh conversion algorithm (PDR.PODM) for distributed shared memory architectures. PDR.PODM is able to explore parallelism early in the mesh generation process because of the aggressive speculative approach employed by the Parallel Optimistic Delaunay Mesh gener...

In this paper, we present a scalable three dimensional hybrid parallel Delaunay image-to-mesh conversion algorithm (PDR.PODM) for distributed shared memory architectures. PDR.PODM is able to explore parallelism early in the mesh generation process because of the aggressive speculative approach employed by the Parallel Optimistic Delaunay Mesh gener...