Daniela Ushizima

Learn More
Numerical simulations of laser wakefield particle accelerators play a key role in the understanding of the complex acceleration process and in the design of expensive experimental facilities. As the size and complexity of simulation output grows, an increasingly acute challenge is the practical need for computational techniques that aid in scientific(More)
One of the central challenges facing visualization research is how to effectively enable knowledge discovery. An effective approach will likely combine application architectures that are capable of running on today's largest platforms to address the challenges posed by large data with visual data analysis techniques that help find, represent, and(More)
As part of the 2008-2009 upgrade of the Franklin Cray XT at the National Energy Research Scientific Computing center, its I/O resources were more than doubled. The extra bandwidth reduced contention for I/O resources and those resources were split into two file systems, /scratch and /scratch2, each with more bandwidth than the original /scratch. In an(More)
We propose and implement a computer vision algorithm for detecting individual cells, including the ability to distinguish subcellular compartments, such as nucleus and cytoplasm. Our approach consists of three main steps: (a) cellular mass estimation, and (b) nuclei detection through superpixel representation and, (c) cytoplasm detection through nuclear(More)
nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any(More)
1.1 Introduction Numerical simulations [1] of laser-plasma wakefield (particle) accelerators [2] model the acceleration of electrons trapped in plasma oscillations (wakes) left behind when an intense laser pulse propagates through the plasma. The goal of these simulations is to better understand the process involved in plasma wake generation and how(More)
—In this paper we introduce and evaluate the systems submitted to the first Overlapping Cervical Cytology Image Segmentation Challenge, held in conjunction with the IEEE International Symposium on Biomedical Imaging (ISBI) 2014. This challenge was organized to encourage the development and benchmarking of techniques capable of segmenting individual cells(More)