I’m a self-taught programmer passionate on various engineering fields. In my early career, I used perl for text processing and web programming. Later I experienced some iOS development shortly, and 3 years solid Hadoop map reduce engineering. Now I work at Google on cloud infrastructure, but in my spare time, my interests are still on data engineering related topics, algorithms, and complexity analysis.

Open source projects

• OPIC – Object Persistence in C A memory allocator for fast serialization

Hadoop projects

• HyperLogLog for Hive Aggregate data with HyperLogLog from hive.

• Hadoop FieldFormat Structured input, output, and writable classes for map-reduce

• Hadoop CombineFileInputFormat Example implementation of hadoop CombineFileInputFormat (used in production).

Clojure projects

• Grunf A http monitoring tool with embedded programming interface in the configuration file.

iOS projects

• FCAnimationFactory A core animation extention that programmer can apply custom timing function to animate position, size, color, opacities and more.

• Pendulum+ A chaotic double pendulum physics simulation with great use of Core Animation. It has good peroformance, low battery usage, and runs smoothly on all iOS platforms. The code is open sourced on github: Pendulum Technical details for Core Animation is on SpeakerDeck

• Earthquake early warning prototype ARM to iOS push notification.

• Taiwan typhoon app Grab typhoon prediction from Taiwan central weather bureau.

• Handle Touch events in UIWebView UIWebView masked its event handling method. In this project I hijacked single touch event and let UIWebView handle other touch events (pin, scroll, double touches…etc.)

• GCD vs OpenMP benchmark Grand Central Dispatch is a great parallel programming model introduced by Apple. I implemented a GCD version of Conjugate Gradient algorithm from NAS Parallel Benchmark and compare to OpenMP version offered by NASA. The GCD results are great.

Other projects

• File::Monitor::Lite Perl module for monitoring file creation, modification, and deletion.

• Lingua::MMSEG Perl module of Chinese word segmentation.

• Macho.js Chinese text wrapping. (Forked and is used in Taiwan web designer’s community)

• CangJieX CangJie Chinese input method for OSX.

• Octopress graphviz plugin (Ruby) Add new syntax into octopress, so that you can write graphviz direct in octopress markdown section.