Publications

Holistic Battlespace Visualization Program

SUNY at Buffalo Center for Computational Research
Link to ResearchGate
The goal of the University at Buffalo Center for Computational Research (CCR) subcontract for the Holistic Battlespace Visualization Program is to develop a cluster-based solution for sourcing large multisource datasets in real-time, to develop software tools to visualize network status and to develop and incorporate into Sarnoff’s visualization system new and diverse types of information. A task-by-task summary of the program accomplishments is given below.

On the block wavelet transform applied to the boundary element method

Engineering Analysis with Boundary Elements (Journal)
Publication Link at ScienceDirect
This paper follows an earlier work [Commun. Numer. Methods Engng. 19 (2003) 387] on the application of wavelet transforms to the boundary element method, which shows how to reuse models stored in compressed form to solve new models with the same geometry but arbitrary load cases—the so-called virtual assembly technique. The extension presented in this paper involves a new computational procedure created to perform the required two-dimensional wavelet transforms by blocks, theoretically allowing the compression of matrices of arbitrary size. Details of the computer implementation that allows the use of this methodology for very large models or at high compression ratios are given. A numerical application shows a standard PC being used to solve a 131,072 DOF model, previously compressed, for 100 distinct load cases in less than 1 h or 33 s for each load case.

Fast solution of problems with multiple load cases by using wavelet-compressed boundary element matrices

International Journal of Numerical Methods in Biomedical Engineering
Publication Link at Wiley.com

This paper presents a fast approach for rapidly solving problems with multiple load cases using the boundary element method (BEM). The basic idea of this approach is to assemble the BEM matrices separately and to compress them using fast wavelet transforms. Using a technique called ‘virtual assembly’, the matrices are then combined inside an iterative solver according to the boundary conditions of the problem, with no need for recompression each time a new load case is solved. This technique does not change the condition number of the matrices—up to a small variation introduced by compression—so that previous theoretical convergence estimates are still valid. Substantial savings in computer time are obtained with the present technique. Copyright © 2003 John Wiley & Sons, Ltd.

An Eclipse-based environment for molecular simulation.

Proceedings of the 2005 OOPSLA workshop on Eclipse Technology eXchange, ETX 2005, San Diego, California, USA
Link at ACM.org

Etomica is an extensible framework for conducting molecular simulations, and it comprises an API and a graphical IDE based on the Eclipse framework. It is written almost entirely in Java, and presently comprises about 1200 classes. In this paper we describe the general structure of the Etomica API, and discuss how we have integrated it into the Eclipse framework. Topics discussed include the design of the simulation framework and the handling of OpenGL graphics that permit real-time visualization of the simulations.

The Effect of Lossy Compression on the Quality of Maps in Geophysics

8th International Congress of the Brazilian Geophysical Society and 5th Latin American Geophysical Conference
Link Brazilian Society of Geophysics

Application of joint time-frequency distribution for estimation of time-varying modal damping ratio

Structural Engineering & Mechanics
Link
The logarithmic decrement method has been long used to estimate damping ratios in systems with only one modal component such as linear single degree of freedom (SDOF) mechanical systems. This paper presents an application of a methodology that uses joint time-frequency distribution (JTFD) as input, instead of the raw signal, to systems with several vibration modes. A most important feature of the present approach is that it can be applied to a system with time-varying damping ratio. Initially the precision and robustness of the method is determined using a synthetic model with multiple harmonic components, one of them displaying a time-varying damping ratio, subsequently the results obtained from experiments with a reduced model are presented. A comparison is made between the results obtained with this methodology and those using the classical technique of Least Squares Complex Exponential Method (LSCE) in order to highlight the advantages of the former, such as, good precision, robustness and excellent performance in extreme cases, e.g., when very low frequency components and time varying damping ratio are present.

Automated Analysis of Piezocone Tests

11th PanAmerican Conference on Geotechnology, Iguassu Falls
Link to Article
This paper presents a method of analysis of seismic piezocone tests. Data from tests in the Rio de Janeiro soft clay are presented and analysed. The paper focuses on the automation of the analyses and a dedicated software is then employed leading to a fast analysis and error checking procedure.

Simulations are Persuasive Tools

SUNY UB Reporter
Link SUNY Buffalo Reporter

Streetscenes, a traffic-simulation software package developed by Henrique Bucher, CCR computational scientist, that allows audiences at public hearings, town-board reviews and boardroom presentations an unprecedented ability to visualize how proposed projects will affect traffic on their street and in their neighborhoods.

The package depicts real traffic, incorporating into each scene realistic traffic speeds and volumes, based on the time of day, weather and road conditions, and parameters such as whether or not there is a football game in the neighborhood that day.

Technology add Dimensions to Roadway Scenes

Buffalo Business First
Link BizJournals.com

The software for Bergmann Associates, developed by CCR computational scientist Henrique Bucher, is called Streetscenes, and Bergmann founder and administrator Charles Hixon calls it his “secret weapon.”

Changing the Streets Through Virtual Reality

Virtual Worldlets
Link VirtualWorldlets.com

Integral Methods in Science and Engineering

Springer
Link Springer
My work is cited/referenced in this book.

Boundary Element Methods for Soil-Structure Interaction

Springer
Link Springer
My work is cited/referenced in this book.

The Boundary Element Method, Volume 1, Applications in Thermo-Fluids and Acoustics

Wiley
Link Wiley
My work is cited/referenced in this book.

Advanced Topics in Scattering Theory and Biomedical Engineering

World Scientific Publishing Company
Link Amazon.com
My work is cited/referenced in this book.

Boundary Element Technology XV

WIT Press
Link to WIT Press
My work was cited/referenced in this book.

Proceedings of the 2003 ASME Summer Heat Transfer Conference

American Society of Mechanical Engineers
Link Barnes&Noble
My work was cited/referenced in this book

Volume 3 of 36th AIAA Thermophysics Conference: June 23-26, 2003, Orlando, FL

American Institute of Aeronautics and Astronautics
My work was cited/reference in this book.

XPairIt Simulator for Peptide Docking and Analysis

U.S. Army Research Laboratory (ARL)
Link to DTLC.mil
My work is cited/referenced in this book.

The wavelet transform for BEM computational fluid dynamics

Elsevier
Link
My work has been cited/referenced in this article.