Home on Hua (Wally) Xie's Digital Outpost [Site In Progress]/Recent content in Home on Hua (Wally) Xie's Digital Outpost [Site In Progress]Hugo -- gohugo.ioen-usA Selection of Journals Relating to The Study of Quality/posts/quality-journals/Thu, 02 Mar 2023 00:00:00 +0000/posts/quality-journals/In correspondence with my relatively recent hiring at Kite Pharma, I have sought to learn more about the academic sub-field/sub-domain of Quality Engineering by identifying and scanning through journals associated with the parent domain of Quality. Below is a list of active Quality journals that I have encountered. Obviously, I might have missed some. I filtered out a handful journals that were dead or seemed less reputable.
Quality Engineering (ASQ and Taylor & Francis) (ASQ-endorsed) Journal of Quality Technology (ASQ and Taylor & Francis) (ASQ-endorsed) Quality Management Journal (ASQ and Taylor & Francis) (ASQ-endorsed) Technometrics (ASQ, ASA, and Taylor & Francis) (ASQ-endorsed) Quality and Reliability Engineering International (Wiley) Stochastics and Quality Control (De Gruyter) Quality Technology & Quantitative Management (International Chinese Association of Quantitative Management and Taylor & Francis) International Journal of Reliability, Quality, and Safety (World Scientific) International Journal of Lean Six Sigma (Emerald)Thoughts on normalizing flows versus physics-inspired neural networks (PINNs) for approximate dynamical system inference/posts/normalizing-flows-vs-pinns/Thu, 23 Feb 2023 00:00:00 +0000/posts/normalizing-flows-vs-pinns/With both normalizing flows and physics-inspired neural networks (PINNs) finally making their way from machine learning and physics literature to be applied in biogeochemical model inference problems, I found myself recently thinking about the similarities in both approaches. I have arrived at the notions below, with the general sentiment that normalizing flows can almost be thought of as belonging to a more specific, less flexible subset of PINNs, except for a key difference in optimization objectives.Arranging a Two-Parameter Gamma Distribution into Exponential Family Form/posts/gamma-distribution-exponential-family/Wed, 23 Dec 2020 00:00:00 +0000/posts/gamma-distribution-exponential-family/Note: MathJax 3, Hugo, and Netlify just aren’t playing nice for some reason, so pardon any \(\LaTeX\) spillage.
A probability distribution function (PDF) is part of the exponential family if it can be arranged into the form
$$ f(x|\theta) = h(x)c(\theta)\exp\left(\sum_{i=1}^kw_i(\theta)t_i(x)\right) $$
where \(\theta\) is the vector of parameters. The shape-scale parameterization of the Gamma distribution PDF takes the form
$$ f_X(x) = \frac{1}{\Gamma(k)\beta(k)}x^{k-1}e^{-\frac{x}{\beta}} $$
We use \(\beta\) to notate the rate parameter in the shape-rate parameterization of the Gamma PDF, while \(k\) is the symbol for the scale parameter.Some older notes about matrix diagonalization to solve a linear ordinary differential equation system/posts/matrix-diagonalization-to-solve-linear-ode/Wed, 23 Dec 2020 00:00:00 +0000/posts/matrix-diagonalization-to-solve-linear-ode/Here is a link to some brief PDF notes I wrote previously on the older incarnation of my blog about using matrix diagonalization techniques to solve an example linear ordinary differential equation system modeling some population dynamics.First first-author paper out in Biogeosciences/posts/bayesian-approach-to-sbm-evaluation-using-ic-and-cv/Mon, 24 Aug 2020 00:00:00 +0000/posts/bayesian-approach-to-sbm-evaluation-using-ic-and-cv/“A Bayesian approach to soil biogeochemical model evaluation [using information criteria and approximate cross-validation]” This one took a while to get out. The project was started in late 2016 as an offshoot of Adriana Romero-Olivares' soil warming meta-analysis detailed in “Soil microbes and their response to experimental warming over time: A meta-analysis of field studies” and was originally meant to be a section of that paper before becoming its own project.Min Chef (民厨) in Tustin, OC/posts/min-chef/Fri, 08 May 2020 00:00:00 +0000/posts/min-chef/Min Chef (民厨) is a pseudo-老北京 (Lao Beijing) restaurant that serves quality variants of authentic Northern Chinese food. Edit3: 民厨 has re-opened as of the latter part of September, 2020!
They have a humble website that I wish had their menu in Chinese. But, that’s a minor quib. In my less-humble opinion, Min Chef is probably one of the best Chinese restaurants in California (and by extension, Los Estados Unidos). The chef, whose name I should get at some point, puts a personal flair on traditional 老北京 (Lao Beijing) dishes that are familiar as comfort food for blue-collar Beijingers, such as 炸酱面 and 炸灌肠儿 (note the all important 儿).About Hua Xie/about/Mon, 01 Jan 0001 00:00:00 +0000/about/General Bio As part of my meandering, I obtained a PhD from the Mathematical, Computational, and Systems Biology program at UCI working in the Allison Lab.
Work Resume
Before I moved to computational statistics, I used to do some filmmaking. Some of my attempts at visual work remain for posterity.
Contact You can reach out to me via one of my emails. I am happy to answer questions about my research and work experiences.