http://sjlee.fiu.edu/Recent content in Seung Jae Lee, Ph.D. on Personal Website of Seung Jae LeeHugo -- gohugo.ioenThu, 23 Apr 2026 12:27:33 -0600http://sjlee.fiu.edu/research/granular-materials-research/Mon, 27 Apr 2026 00:00:00 +0000http://sjlee.fiu.edu/research/granular-materials-research/Selected Publications Particle Geometry Space (PGS): An Integrated Characterization of Particle Shape, Surface Area, Volume, Specific Surface, and Size Distribution https://doi.org/10.1016/j.trgeo.2025.101579 This work introduces Particle Geometry Space (PGS), a unified analytical framework integrating particle size (D), shape (β), surface area (A), volume (V), and specific surface (A/V) into a single geometry-based representation. Moving beyond conventional isolated methods by characterizing size or shape, PGS enables systematic interpretation of all 3D particle geometry attributes in a single space and its relationship to granular material behavior while extending the traditional particle size distribution concept into a multidimensional framework.http://sjlee.fiu.edu/archived/blog/spoonful-series/01-spoonful/Fri, 01 Jan 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/spoonful-series/01-spoonful/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/spoonful-series/01-spoonful.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single-series does this work? or this? Let’s start. beginning middle endhttp://sjlee.fiu.edu/research/numerical-methods-and-advanced-computing/Mon, 27 Apr 2026 00:00:00 +0000http://sjlee.fiu.edu/research/numerical-methods-and-advanced-computing/Selected Publications iDEM: An Impulse-Based Discrete Element Method for Fast Granular Dynamics https://doi.org/10.1002/nme.4923 This work introduces an impulse-based discrete element method (iDEM) for efficient simulation of granular materials. By replacing contact-force calculations with collision impulses and directly updating particle velocities, the method bypasses acceleration integration while preserving fidelity. The approach is numerically stable and achieves speedups approaching two orders of magnitude over conventional DEM, enabling large-scale simulations on accessible computing hardware.http://sjlee.fiu.edu/archived/blog/spoonful-series/02-spoonful/Sat, 02 Jan 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/spoonful-series/02-spoonful/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/spoonful-series/02-spoonful/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single-series Images in this page bundle: /archived/blog/spoonful-series/02-spoonful/sidebar-inverse.jpg part 2! does this work? now for some very cool things more get ready!http://sjlee.fiu.edu/research/wind-and-facade-engineering/Mon, 27 Apr 2026 00:00:00 +0000http://sjlee.fiu.edu/research/wind-and-facade-engineering/Selected Publications Wind-Induced Dynamic Behavior of Single-Skin Curtain-Wall System: A Comparative Numerical Study https://doi.org/10.1061/JAEIED.AEENG-1725 This work advances the understanding of wind-induced dynamic behavior in building façades through the development of high-fidelity numerical models for single-skin curtain-wall systems. By representing façades as interconnected mechanical systems with operable components rather than a simplified plate model, the study captures the dynamic response under wind loading while maintaining practical computational efficiency.http://sjlee.fiu.edu/archived/blog/spoonful-series/03-spoonful/Sun, 03 Jan 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/spoonful-series/03-spoonful/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/spoonful-series/03-spoonful/index.markdown Here is my R Markdown source file: archived/blog/spoonful-series/03-spoonful/index.Rmarkdown You'll want to edit this file, then re-knit to see the changes take effect in your site preview. To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single-series Images in this page bundle: /archived/blog/spoonful-series/03-spoonful/featured-photo.http://sjlee.fiu.edu/research/historic-preservation/Mon, 27 Apr 2026 00:00:00 +0000http://sjlee.fiu.edu/research/historic-preservation/Selected Publications Image-Based 3D Modeling-to-Simulation of Single-Wythe Masonry Structure via Reverse Descriptive Geometry https://doi.org/10.1016/j.jobe.2023.107125 This study develops an image-based 3D modeling-to-simulation framework for rapid vulnerability assessment of single-wythe historic masonry structures. Using reverse descriptive geometry, 2D wall images are transformed into 3D discrete element models for seismic analysis. The framework combines automated geometry reconstruction, impulse-based dynamic simulation, and high-fidelity masonry modeling to enable efficient, accurate, and computationally scalable hazard assessment.http://sjlee.fiu.edu/research/bridge-engineering/Mon, 27 Apr 2026 00:00:00 +0000http://sjlee.fiu.edu/research/bridge-engineering/Selected Publications Impact of pile-to-cap fixity on the design and behavior of sensitive structures https://doi.org/10.15554/pcij67.1-01 This study challenges the long-standing assumption that pile-to-cap connections behave as pinned connections by demonstrating that substantial fixity can develop even at relatively shallow embedment lengths. Through advanced finite element modeling, the research identifies embedment length and axial compression as the primary parameters governing connection behavior and establishes a mechanics-based framework for predicting connection response.http://sjlee.fiu.edu/archived/blog/2021-05-26-lorem-simpson/Wed, 26 May 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/2021-05-26-lorem-simpson/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/2021-05-26-lorem-simpson/index.markdown Here is my R Markdown source file: archived/blog/2021-05-26-lorem-simpson/index.Rmarkdown You'll want to edit this file, then re-knit to see the changes take effect in your site preview. To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/blog/2021-05-26-lorem-simpson/featured.http://sjlee.fiu.edu/archived/blog/2021-05-25-lorem-star-wars/Tue, 25 May 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/2021-05-25-lorem-star-wars/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/2021-05-25-lorem-star-wars/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/blog/2021-05-25-lorem-star-wars/featured.jpg But first, a shortcode trick Courtesy of panelset.js by Garrick Aden-Buie, from his xaringanExtra package: https://pkg.garrickadenbuie.com/xaringanExtra/#/panelsethttp://sjlee.fiu.edu/archived/blog/2021-05-24-lorem-development/Mon, 24 May 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/blog/2021-05-24-lorem-development/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/blog/2021-05-24-lorem-development/index.markdown Here is my R Markdown source file: archived/blog/2021-05-24-lorem-development/index.Rmarkdown You'll want to edit this file, then re-knit to see the changes take effect in your site preview. To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/blog/2021-05-24-lorem-development/featured.http://sjlee.fiu.edu/archived/talk/campfire/Tue, 12 Jan 2021 00:00:00 +0000http://sjlee.fiu.edu/archived/talk/campfire/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/talk/campfire/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/talk/campfire/featured.jpg I’m really excited to give this talk! Stay tuned for video and slides.http://sjlee.fiu.edu/archived/talk/second-seedling/Fri, 01 Jan 2021 14:15:59 -0600http://sjlee.fiu.edu/archived/talk/second-seedling/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/talk/second-seedling/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/talk/second-seedling/featured.jpghttp://sjlee.fiu.edu/archived/talk/seedling/Mon, 13 Jan 2020 14:15:59 -0600http://sjlee.fiu.edu/archived/talk/seedling/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/talk/seedling/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/talk/seedling/featured.jpghttp://sjlee.fiu.edu/archived/project/giraffes/Wed, 03 Jul 2019 00:00:00 +0000http://sjlee.fiu.edu/archived/project/giraffes/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/project/giraffes/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/project/giraffes/featured-hex.png /archived/project/giraffes/tachyons-logo-script.png /archived/project/giraffes/tachyons-thumbnail.png Tachyons is a design system that allows you to design gorgeous interfaces in the browser with little effort. Because Speed Building this static site generator theme was the first time I used an Atomic (or Functional) CSS system like Tachyons.http://sjlee.fiu.edu/archived/project/penguins/Tue, 02 Jul 2019 00:00:00 +0000http://sjlee.fiu.edu/archived/project/penguins/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/project/penguins/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single-sidebar Images in this page bundle: /archived/project/penguins/css-grid-cover.png /archived/project/penguins/css-grid-thumbnail.png /archived/project/penguins/featured-hex.png “Grid is the very first CSS module created specifically to solve the layout problems we’ve all been hacking our way around for as long as we’ve been making websites.http://sjlee.fiu.edu/archived/project/bakeoff/Mon, 01 Jul 2019 00:00:00 +0000http://sjlee.fiu.edu/archived/project/bakeoff/Hi, I'm the here-bot cat! Use me to find your way in your website. Here I am: content/archived/project/bakeoff/index.md To remove me, delete this line inside that file: {{< here >}} My content section is: archived My layout is: single Images in this page bundle: /archived/project/bakeoff/built-in-contact-form-screenshot.png /archived/project/bakeoff/built-in-contact-form-thumbnail.png /archived/project/bakeoff/featured-hex.png /archived/project/bakeoff/formspree-logo.png Formspree makes it easy to receive submissions from HTML forms on your static website. Functional Form This theme has a form-to-email feature built in, thanks to the simple Formspree integration.http://sjlee.fiu.edu/license/Mon, 01 Jan 0001 00:00:00 +0000http://sjlee.fiu.edu/license/This website is released under the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0). The content may be shared and adapted provided appropriate credit is given and derivative works are distributed under the same license.