My Resume

Key accomplishments:

• Auto select webpages based on product configuration; don't need to duplicate configuration
• Implementing unit testing (part of firmware-wide effort)
• In experimental project to add small-office user management

Key accomplishments:

• Track defects more efficiently and effectively
• Added server-side preprocessing to reduce HTTP requests
• Changed backup/restore settings code to be modular, data driven and secure
• In experimental project to enable printing kiosk in public locations
• Lead code refactoring exercises

Tools: GIT

Architect role: implementing new look-and-feel for a different range of printers, improving the code architecture and evaluating up-and-coming technologies.

Mentor role: responsible for maintaining the coding standards and improving the team's skills.

Key accomplishments:

• Improved home page access by 100% through a combination of techniques, such as enabling HTTP caching, combining files and using image sprites.
• Improved session management with security in mind; works to an extent even without cookies.
• Improve the development environment by using the deployment parameters automatically. (Don't need to configure twice.)
• Do automatic element matching for related XML files to reduce maintenance efforts.
• Integrated HTML fragments within JS files to reduce HTTP requests.
• Created CSS preprocessor to simplify style handling. Layout, browser-specific and right-to-left language styles are synthesized from existing styles.
• Enabled linting to enforce good coding practices.

New Printer Website

In the framework team to rearchitect the printer website for the 2010 printer lineup.

Features: Ajax-based, JavaScript file dependencies, templated HTML, GUI widgets, namespaced XML, customizable homepage and localization.

Technologies: HTML, CSS, JavaScript, jQuery, jQuery UI, XML, PHP, Perl, C
Tools: Apache, SVN, Linux

Energy Star 1.1 Compliance

Late requirement to modify our printers to meet the ES 1.1 standard.

Led the firmware team and worked closely with the EE. One of our objectives was to minimize changes in a largely non-sleep aware firmware due to the tight schedule.

Technologies: C, ThreadX
Tools: SVN, Linux

Universal Printer Driver (UPD)

Modified our business printers to allow the use of the UPD — just one driver needed to print to any printer!

Improvements to Pen Alignment

Created new pen alignment algorithms that are faster and more accurate. Filed several disclosures, but were deemed too specific.

Added end-user scripting support by adding a virtual machine (with ~100 instructions).

Technologies: C++, ThreadX
Tools: BitKeeper, Linux

1" Printhead Pen Alignment

Designed and implemented new patterns for the 1" printheads.

Technologies: C++, MIPS assembly language (minimal), ThreadX
Tools: ClearCase, HP-UX

4800 dpi

Improved the in-printer pen alignment to meet the 4800 dpi claim. (Patent Application #20060158476)

Technologies: C, ColdFire assembly language, vxWorks
Tools: ClearCase, HP-UX

The website allows UOB customers to enquire and do transactions with their accounts over the Internet. The project migrates the original CGI-based system to a J2EE platform.

UOB Internet-banking IPO transaction

Migrated the IPO transaction from C++/COBOL to J2EE. This is a multi-page workflow that allows the customer to apply for IPOs through the website.

Technologies: WebLogic J2EE, HTML, JavaScript
Tools: Ant, CVS

Object Oriented Gate System

A real-time embedded gate control system used in the MRT gates. The MRT gate processes the passengers' ticket and controls traffic flow using a barrier.

Technologies: C++, x86 assembly language, vxWorks
Tools: Visual Studio 6

YouTube and blip.tv user scripts

Wrote two user scripts YouTube Links and Blip.tv Links that show the video links so that they can be saved easily. (Local link)

Sudoku Solver

Wrote a Sudoku solver that does single/hidden candidate, line/box interaction, naked/hidden subsets, fishy subsets (X-Wing, Swordfish and Jellyfish).

Request Management System (On hold)

A simple system that allows requests to be entered and followed-up on.

Technologies: HTML, CSS, JavaScript, jQuery, JSON, Ajax, PHP, MySQL
Tools: Apache, Linux

Game State Machine (On hold)

A server-side game state machine that allows different board games to be implemented on the browser.

Has user management and chat.

Technologies: HTML, CSS, JavaScript, jQuery, JSON, Ajax, PHP, MySQL
Tools: Apache, Linux

PlayStation Emulator (On hold)

Understood how the PlayStation works using the long defunct open-source PCSX emulator, then develop a new emulator from scratch.

Objectives:

• I want to achieve good emulation through correct principles (of how the real PlayStation works) and not through hacks.
• I want to research binary translation (also known as dynamic recompilation). I am converting the MIPS R3000 instructions to an intermediate language, processing it and then translating it to native code (x86/ARM).
• Having seen lots of bad C code, I want to write a properly designed C program.

Key features:

• Many tunable parameters, such as fractional instruction cycles, memory read/write speed, DMA speed and so on.
• Precise event/interrupt handling. Emulation inner loop runs until the next scheduled event. This is unlike the original where events are checked at every taken branch.
• Small and efficient memory map — using two 128 kB pagetables to map 512 MB address space (at 4 kB page granularity).
• One I/O memory map for 1-, 2-, 4- bytes access. The same map is used by both the interpreter and the recompiler.
• Uses HLE (High-Level Emulation) instruction to break into the emulator for various purposes. This is very efficient because we don't have to monitor every instruction. (Enhancement of existing feature)
• Dynamic recompilation at the function level. This allows much more efficient translation than at basic-block level. (Work-in-progress)
• A built-in network-based debugger: unassemble, dump, edit, go, halt, trace, add/del breakpoints, add/del watchpoints

Technologies: C, MIPS 3000, x86 assembly language, Win32
Tools: Visual Studio 2010

The system implements a simple Pascal interpreter and uses INI format for storage.

Used: Delphi, Windows 95

Used: C, x86 assembly language, DOS

Used: C, DOS