Welcome to Andy Fraser's

web page at FraserPhysics.com

Andy on Pajarito Mountain in New Mexico

Contact me at: Email: andy@fraserphysics.com My spam system has been flaky (2020-11). If I don't reply in a day, try again. Telephone: 505 695 2788 Mail:  197 Taos Los Alamos, NM 87544

Cover of my 2008 book from SIAM.

• I am working on a second edition of Hidden Markov Models and Dyanmical Systems. Here is - a recent draft.
• A document with a snippet of the ECG for each usable record in the data for the CINC200 challenge. I am using that data for the second edition of the book, and I want expert opinion about some features of the data.
• In May, 2025, I gave a talk, Estimating Dynamics and Data Assimilation to Detect Obstructive Sleep Apnea, at the SIAM Conference on Applications of Dynamical Systems .
• I presented a poster, Entropy, Cross Entropy and Data Assimilation at Dynamics Days US 2025. The only new feature of the poster was the use of a particle filter to model time series of discrete symbols generated by the Lorenz system.
• On November 19, 2024 the Los Alamos County Council approved spending $35M on a project to make fiber broadband available throughout the county. See my advocacy for this result at blabnow.blog.
• At the 2023 SIAM Conference on Applications of Dynamical Systems I presented Using Discrete State Hidden Markov Models to Estimate Heart Rate.
• At the 2021 SIAM Conference on Applications of Dynamical Systems the title of my talk was Data Assimilation and Software for Reliability in which I summarized the software tools I'm using now.
• Writing code for the book takes more time that writing the text. You can fetch the code from the two repositories hmm and hmmds. I use the Nix package manager, and I can build each of the works mentioned above from a Nix shell by issuing a command like make ds23. See Getting Started in the documentation for information on using the code from other environments.

• My thoughts about how the MAGA movement is squandering the scientific legacy built on the disaster of WWII.
• On 2025-01-10 Google Scholar found 8,511 citations to my work, and listed 55 articles.
• I believe that my early papers about mutual information have been widely cited because I posted the code for the work on the Internet in 1986. Since people occasionally ask for that outdated code, I post it here.
• The last project that I worked on at the Los Alamos National Laboratory concerned the equation of state of the gasses produced by detonating chemical explosives. Imitating the 1960s TV show The Man from UNCLE, I called the project Functional UNcertainty Constrained by Law and Experiment (F U.N.C.L.E.). Here is a poster from SciPy2016 which has a nice picture of Napoleon Solo, played by Dr. Robert Vaughn, and Illya Kuryakin, played by David McCallum. Here is the proceedings paper. And here is a summary of a presentation at NEDPC (Nuclear Explosives Design Physics Conference) in 2019.
• Personal pictures etc.
• A frame from the movie Oppenheimer in which I was an extra playing Senator Lausche. I am the skeptic on the right listening to Senator Pastore justify the persecution of the title character.