About Guo-Fu Tseng(CoolDavid) 曾國輔

Personal Info

Chinese Name: 曾國輔 English Name: Guo-Fu Tseng BirthDate: March 8th, 1982 Master Degree of Computer Science and Engineering from National Sun Yat-sen University 國立中山大學 資訊工程學系 碩士 Chief Architect of GRAID Technology Inc. 圖睿科技 首席架構師 Email: cooldavid AT cooldavid DOT org GTalk: cooldavid AT gmail DOT com

Summary of Projects and Experiences

Social Networks

• Pages:
  • LinkedIn
  • Facebook

Publications

• CDPthread: A POSIX-Thread Based Distributed Computing Environment
• METHOD AND APPARATUS FOR PERFORMING PIPELINE-BASED ACCESSING MANAGEMENT IN A STORAGE SERVER
• Data transmission and protection system and method thereof
• Direct memory access data path for RAID storage

Have experience in:

• Programming Language:
  • High Level Languages:
    • C
    • C++
    • CUDA
    • JAVA
    • Perl
    • PHP
    • MySQL
    • JavaScript
    • AJAX
  • Assembly/Low Level Languages:
    • x86
    • ARM
    • MIPS
    • MMIX
    • NVIDIA PTX
    • LLVM
  • Hardware Description Languages:
    • Verilog
• UNIX (User Application, Kernel, Driver) Programming
• UNIX System Management (FreeBSD, Gentoo Linux)
• Network Programming
• Network Management (Campus scale)
  • Router Management
    • CISCO 7609
    • Extreme Networks BlackDiamond 6800
    • Extreme Networks BlackDiamond 8810
    • Juniper M160
  • Switch Management: 3Com, HP, CISCO, Nortel, D-Link, Zyxel
  • Problem diagnosis
  • Performance testing/tuning
  • IPv6
• Electric Engineering
  • EDA Tools(gEDA schematic/PCB)
  • PCB Layout Design
  • PCB Making
  • Basic DC/DC and AC/DC Power Circuits
  • Soldering with Iron and Hot-Air-Tool
  • Soldering Small SMD Components

Contests

• First price in NSYSU Campus-Wide Programming Contest, Fall 06
  (95學年度校內程式設計比賽 甲組 第一名)
• Honorable Mention in Matrix Computation of High Performance Computation Contest 2007
  (2007國網盃高速計算體驗賽：矩陣超級明星賽 佳作)
• 2005 第一屆華佗盃網路解疑技能大賽 入圍
• 入圍參加94,93,92學年度ACM亞洲區競賽
• 94學年度全國大專電腦軟體設計競賽 佳作
• 入圍參加93,92學年度全國大專盃競賽
• Third price in NSYSU Campus-Wide Programming Contest, Fall 04(93學年度校內程式設計比賽 甲組 第三名)

Open source contribution

• Linux Kernel Maintainer: JMicron Network Driver
• GSoC 2010： [GI]PXE： JMicron Network Driver / Misc Network Updates
• GSoC 2011： [GI]PXE： As mentor
• IPv6 TSP Tunnel Server(RFC5572)
• Patch FreeBSD ng-netflow kernel module to support 802.11Q VLAN
• Fixed APEX Loader having problem to send packet through gateway.

Service experiences

• Full Time:
  • System Software Engineer of JMicron(2008.7 -> 2008.8)
  • Research Assistant of Institute of Information Science, Academia Sinica(2011.03 -> 2014.07)
  • Senior Engineer of Bigtera(2014.08.11 -> 2017.06.30)
  • Supervisor Engineer of Bigtera(2017.07.01 -> 2019.07.31)
  • Project Deputy Manager of Bigtera(2019.08.01 -> 2020.03.31)
  • Chief Architect of GRAID Technology(2020.04.01 -> Now)
• Part Time:
  • System maintainer of SCTNET project in computer center of NSYSU
    計網中心應用組思摩特計畫系統工讀生(2004.4 -> 2008.7)
  • Mail system maintainer of graduate assistance department of NSYSU
    中山畢輔組組郵件網頁主機系統工讀生(2006.6 -> 2011.7)
  • 3D SoC Project of Ministry of Science and Technology
    國科會3D SoC計畫工讀生(2007.8 -> 2008.7)
  • BBS Server system maintainer in computer center of NSYSU
    主機系統工讀生(2009.7 -> 2011.3)
  • Google Summer of Code 2010 Student (2010.4 -> 2010.8)
• Volunteer Services:
  • Campus Dorm-Net Promotion Association-中山大學宿舍網路推廣協會
    • Leader of programming team-程式組組長(2003.3 -> 2004.3)
    • President-會長(2004.3 -> 2005.6)
    • Leader of programming team-程式組組長(2005.6 -> 2006.3)
    • Adviser-資深顧問(2006.3 -> NOW)
  • Google Summer of Code 2011 Mentor (2011.4 -> 2011.8)
• Graduated student of Operating System Lab. CSE Depart. NSYSU(2007.8 -> 2011.7)

Educational experiences

• Graduated from:
  • National Taichung Second Senior High School (1998 to 2002)
    國立台中二中
  • Bachelor Degree of Computer Science and Engineering from National Sun Yat-sen University (2002 to 2007)
    國立中山大學 資訊工程學系 學士
  • Master Degree of Computer Science and Engineering from National Sun Yat-sen University (2007 to 2009)
    國立中山大學 資訊工程學系 碩士
• Was enrolled in:
• PhD student of Operating Systems Lab. CSE Depart, NSYSU. (2009 to 2011)
  國立中山大學資訊工程所 博士班 作業系統實驗室

Projects

• Campus Dorm-net management system of NSYSU(2003.10 -> 2011.7)
  • Device management through SNMP protocol
  • Switch Port, MAC, IP, etc... Status Control
  • Flow control with netflow and flowtools
  • Automatic lock/unlock mechanism
    • Block by modifying user's VLAN and redirect facility instead of disable port, providing user more information
    • Wrong IP setting detection
    • Spam detection
    • Virus detection
    • Flow control
  
  
• Web based Video Conference (2005/1)
  • Client written in Java Applet with JFM library.
  • Server written in Java Application
  • Tested with 4 different people logged-in at same time
    • Each one can see all other 3 people's video
  • Compressed each frame with JPEG, not using moving picture compressing algorithm yet.
  • Audio, Text communications are not completed
  
  
• Pascal (Subset) to MMIX Compiler (2005/5 -> 2005/8)
  • Written in pure C(Not using Flex, Bison)
  • Supporting basic flow-control, loop, variable declaration syntaxes
  • Support Integer and String data-type.
  • Support Standard I/O
  • Active Record Implemented (Support Recursive)
  • There is no limit of:
    • Number of local variables
    • Number of global variables
    • Number of function parameters
  
  
• SNMP Switch Port Counter Collector (2005/11 -> 2006/03)
  • Gather more then 15,000 OISs per second.
  • Written in C, with multi-thread
  • Using net-snmp, and mysql C library
  
  
• VPN Virtual NIC Linux Driver (2006/1)
  • Replace the physical link by IP Tunnel.
  • IP Tunnel implemented with kernel socket.
  • Since it's virtual NIC(No interrupt for receiving data), I created a kernel thread to block on waiting data.
  
  
• Embedded System (2006/3)
  • I bought a ARM platform from Internet
  • ARM-7 with MMU, Sharp ZOOM SDK
  • Compiled new boot-loader, kernel, and built-up a root file-system with busybox
  • Burned everything into it's 16MB flash
    • dhcpd(udhcp)
    • sshd(dropbear)
    • nat(iptables)
    • Standalone boot-up, and act like an home router.
  
  
• Embedded System 3D Accelerator Driver on Linux(2006 -> 2007.7)
  • ARM Versatile Platform
  • Industry-academic Cooperation of Ministry_of_Science_and_Technology and Himax
  • Linux driver of 3D hardware accelerator
  • Hardware performance evaluation
  
  
• MIPS Processor written in verilog (2007/7)
  • Final project of HDL course
  • Tools:
    • GCC
    • Makefile
    • iVerilog
    • gtkwave
    • SPIM
    • Debussy
  • Supported Instructions:
    • Arithmetic/Logic:
      • add, addu, addi, addiu
      • sub, subu
      • and, andi, or, ori, xor, xori, nor
      • slt, sltu, slti, sltiu, lui
    • Memory: lw, sw
    • Flow-Control: j, jal, jr, 1, beq, bne
    • Co-Processor: mfc0
  • Exception handler:
    • EPC Register
    • Cause Register, Exception Code Field:
      • Instruction Error
      • Arithmetic Overflow
  • Wrote an assembler myself for translating to binary code
  • Tested bunch of MIPS assembly on my platform, and having the same result with SPIM.
  
  
• OpenGL ES 2.0 Shading Language to LLVM Compiler(2007.8 -> 2008.7)
  • Project of National Science Council
  • Based on previous 3D-Labs' GLSL compiler front-end
    • Modified it to support precision qualifiers that only exist in OpenGL ES
    • Implemented an LLVM Code Generator
    • Added some LLVM instructions to support more Matrix/Vector Data Manipulation
  
  
• JMicron Ethernet Driver for Linux(2008/7 -> Now)
  • Mainly written in 2008/7 -> 2008/8
  • Got into Linux Mainline kernel since 2.6.28
  • Continue maintaining it for fun
  
  
• CDPthread: A POSIX-Thread Based Distributed Computing Environment(2008/12 -> 2009/9)
  • Implement POSIX-Thread compatible libraries for user to use as an distributed parallel computing interface.
  • All communications are transparent to programmer.
  • Programmers is able to write the distributed programs as writing multi-thread programs without any difference.
  • Easy to setup, adding new nodes to cluster with zero configuration.
  • The full-text of this paper is publicly available.
  
  
• GPXE: JMicron Ethernet Driver and misc Network updates(2010/4 -> 2010/8)
  • Written as Google Summer of Code Student
  • Implement JMicron Ethernet Driver
  • TCP Stack clean-up and optimizations
  
  
• IPv6 TSP Tunnel Server(2011/04 -> 2011/06)
  • Features:
    • Implementation of RFC5572
    • Compatible with gw6c and gogoc1.2 client.
    • O(1) session management:
      • Create new session
      • Packet forward
      • Drop session update
    • MySQL and LDAP(Written by Stephen Rothwell) backend
    • Anonymous and Authenticated mode
  
  
• Audio Power Amplifier(2012/01)
  • Power source
    • 3 Independent power sources for:
      • Right Channel Power output
      • Left Channel Power output
      • Small signal first stage amplification
    • Using LM337 and LM317 LDO IC
  • Output MOSFET:
    • N channel push output: K1529*2
    • P channel pull output: J200*2
  • Delay switch for speaker protection
  
  
• Basic EE, EDA Tools, PCB Making(2012/12 -> Now)
  • EDA Tools(gEDA schematic/PCB)
  • PCB Layout Design
  • PCB Making
  • Basic DC/DC and AC/DC Power Circuits
  • Soldering with Iron and Hot-Air-Tool
  • Soldering Small SMD Components