tim This post is about how to use design tools to save time and build nice stuff at home using computer controlled machines (CNC). In addition to describing my design process, I’ve also included the helpful references I found along the way. Our old thermostat was too small for our wall. I could have replaced the … Read more
Cybersecurity and cryptoanalysis is a field filled with logic puzzles, math and numerical techniques. One of the most interesting technical areas I’ve worked goes by the name of satisfiability modulo theories (SMT) and their associated solvers. This post provides a layman’s introduction to SMT and its applications to computer science and the modern practice of learning … Read more
Framing around bulkheads is painful. It is hard to get everything straight and aligned. I found the Shopbot to be very helpful. There are three problems I was trying to solve: (1) Getting multiple corners straight across 30 feet, (2) nearly no time and (3) basic pine wood framing would sag over a 28″ run. … Read more
My daughter had to make a “probability game” for her fifth grade math class. She has been learning javascript and digital design so we worked together to design and build a roulette wheel for her class. First, she drew out a series of sketches and we talked it over. She wanted a 0.5 inch thick … Read more
“Intervention in atmospheric and climatic matters . . . will unfold on a scale difficult to imagine at present. . . . this will merge each nation’s affairs with those of every other, more thoroughly than the threat of a nuclear or any other war would have done.” — J. von Neumann Disclaimer: This is … Read more
Motivation I had to upgrade the Lego table I made when my kids were much smaller. It needed to be higher and include storage options. Since I’m short on time, I used several existing automation tools to both teach my daughter the power of programming and explore our decision space. The goals were to stay … Read more
In my work at DARPA, I’ve been exposed to hidden Markov models in applications as diverse as temporal pattern recognition such as speech, handwriting, gesture recognition, musical score following, and bioinformatics. My background is in stochastic modeling and optimization, and hidden Markov models are a fascinating intersection between my background and my more recent work … Read more
Humanity is now entering a period of radical transformation in which technology has the potential to significantly raise the basic standards of living for every man, woman and child on the planet. The future can be a scary place It can be easy to develop a gloomy view of the future. Malthus was the first … Read more
I often struggle to find the right balance between automation and manual work. As it is tax time, and Chase bank only gives you 90 days of statements, I find myself every year going back through our statements to find any business expenses and do our overall financial review for the year. In the past … Read more
I love history, but raw history can be a bit boring and so I look for books that peer into the past with a different lens or narrative. Here, Tom Standage tells a popular history of the world through six beverages: beer, wine, spirits, coffee, tea and Coca Cola. Full of the anecdotes and stories … Read more