My works
March, 1997
Enrolling Pohang university of Science and Technology ( Postech )
I enrolled postech. My major is computer science and engineering.
April, 1997
Hanulrim spring concert
I played as second violinist in hanulrim spring concert. Hanulrim is a amateur classic orchestra in postech.
Unix study seminar lecturer in postech
I was a lecturer in a seminar. I taught c shell to the students. The related information : cshell.zip
July, 1997
Wrote about perl
I wrote a article about usages of perl script language. The related information : perl.ps
Opened Lion Web BBS
Lion is a name of telnet bbs in compuer science and engineering department. I connected it to web. It's made in a month. Therefore, it had many problems. It's made in perl script language. The related information : lionwebbbs.tar.gz, Lion Web BBS
September, 1997
Hanulrim autumn concert
I played as second violinist in hanulrim autumn concert.
November, 1997
Became PLUS member
I became a PLUS(Postech Laboratory for Unix Security) member. I was able to study in computer network security.
Wrote Security PLUS for Unix III
I wrote Security PLUS for Unix III. This book had been published every year in the PLUS. It's the third edition. I wrote about CGI Security. The related information : cgi.hwp
February, 1998
Made a tetris game
I made a tetris game in java. It needs jdk 1.1.x. It supports network play. The related information : Screen Shot, OhharaTetris.tar.gz
March, 1998
Studied in se lab
I began to study in the se lab.
April, 1998
Hanulrim spring concert
I played as second violinist in hanulrim spring concert.
Security seminar lecturer
I taught CGI security to postech system administrators. The related information : cgi.ppt
May, 1998
Security seminar lecturer
I taught samba security to PLUS members. The related information : samba.ppt
Made a drawing tool
I made a drawing tool for x windows. It's made in gtk-- library. It's a term project of the c++ programming language class. The related information : Screen Shot, cs232.ps, Binary (x86 linux), OhharaDraw.tar.gz
June, 1998
Made 8 bit computer
I made a 8 bit computer. It's a term project of the digital system. Each modules worked fine. However, I couldn't coordinate the modules. The related information : cs274.ps
Traced a hacker ( dark )
I found a Italian hacker whose nickname was 'dark'. The hacker hacked many hosts through the postech for two weeks.
July, 1998
Traced a hacker ( kaka )
I found a Mexican hacker whose nickname was 'kaka'. The hacker hacked a postech server.
Made gtk-- example program
gtk-- has very few example programs. Therefore, I made some example programs with gtk--. The related information : gtk---examples.tar.gz
August, 1998
Security seminar lecturer in postech
I taught linux security to postech system administrators. The related information : linux-postech.ppt
Made linux security check program
I made a linux security check program checking the vulnerability of the target host. It's too old. The related information : Screen Shot, linuxcheck_binary.tar.gz
Security seminar lecturer in 4th WIO workshop
I taught linux security to WIO members in SERI, Taejon. The related information : linux.ppt
September, 1998
Hanulrim autumn concert
I played as second violinist in hanulrim autumn concert.
Found a mexican hacker
I found that an unknown mexican hacker tried to scan .ac.kr domain. I notified the system administrators about that.
October, 1998
Checked the security of the postech servers
I checked the security of the postech servers. The number of checked servers are about 150. The check program is made by Moonkyu Song and myself.
December, 1998
Finished KT project
I finished KT project successfully. its purpose is showing the hacking process.
February, 1999
Managed the se lab systems and network
I began to manage the se lab systems and network.
Security seminar lecturer in 5th WIO workshop<
I taught IP spoofing attack to WIO members in Sookmyung woman's University. The related information : ipspoof.ppt
March, 1999
Traced many hackers
Many hackers attacked postech servers. So I traced the hackers.
Security seminar lecturer in the CONCERT seminar
I presented hacking accidents to CONCERT members in postech. The related information: poshack.ppt
May, 1999
Helped E newspaper company hacking accident
E newspaper company was hacked. After hacked, I helped.
June, 1999
Made game database
I made a game database. It's a term project of database class. I used java servlet, jdbc, and oracle. The related information : joe.tar.gz
Made game database with AI technique
I made a game database with AI technique. It's a term project of AI class. The related information : joec.tar.gz
Made c- language compiler
I made a c- language compiler. It's a term project of the compiler class. The c- language is the subset of the c language for compiler class. It outputs assembly code and the code is interpreted in the tiny machine (TM). The TM is very simple machine for compiler class. I used flex, bison to make this compiler. The related information : cs423_asn06.tar.gz, cs423_asn06.ps
Wrote Security PLUS for Unix IV
I wrote Security PLUS for Unix IV.
Security seminar lecturer in postech
I taught linux security to the postech system administrators. It's based on the Security PLUS for Unix IV. The related information : linux-book.ppt
Checked the security of the postech servers
I checked the security of the all postech servers. The number of the servers are about 1200.
Made a database of the postech servers
I made a database of the postech servers. Therefore, I could check the security of the servers very easily.
July, 1999
Security seminar lecturer in Kyungpook university
I taught linux security to the system administrators in the Kyungpook university. The related information: linux-kyungpook.ppt
Won the good venture item prize
I won the good venture item prize. I got 2500000 Won.
August, 1999
Got highest level first in the hackerslab
I got the highest level first in the hackerslab. Hackerslab is a hacking freedom area.
Sisa journal reporter interviewed me
Sisa journal reporter interviewed me. The related information : The article
September, 1999
Wrote a security article in the HOWPC September
I wrote a linux security article in the HOWPC September. HOWPC is the computer magazine for computer newbie. I explained the past hackers and the present hackers. The related information : The article
Hanulrim autumn concert
I played as second violinist in hanulrim autumn concert.
Appeared on Taegu MBC television program
I appeared on Taegu MBC television program for 5 minutes.
Hangookilbo reporter interviewed me
Hangookilbo reporter interviewed me.. The related information : The article
October, 1999
Made PSEC II
I made PSEC II which is the security administration tool. It's made by PLUS members and myself.
Appeared on Pohang MBC
I appeared on Pohang MBC for 8 minutes.
Hangookilbo reporter interviewed me.
Hangookilbo reporter interviewed me. The related information : The article
November, 1999
Security seminar lecturer in 3rd CONCERT workshop
I taught the recent hacking techniques to the CONCERT members. The related information : concert99.ppt
Postech advertisement magazine reporter interviewed me.
Postech advertisement magazine reporter interviewed me. The related information : The article
Traced a hacker ( dredcon )
I traced a hacker whose name is dredcon. This hacker acted in #hack_koera irc channel in efnet, and attacked many Korean servers.
December, 1999
Made an OS
I made an OS. It's a term project of the OS class. A real OS is very complicated. Therefore, my OS supported very simple functionality. For example, multiprogramming, system call, demand page. The related information : cs312.tar.gz
Made a CPU
I made a CPU. It's a term project of the computer architecture class. I made an assembler, too. I didn't make real CPU. However, I designed CPU with VHDL and simulated it. It's 16bit RISC CPU and supports pipeline. The related information : cs313.tar.gz
Be absent from postech for three years because of military service
I was absent from postech for three years because I had to fullfill my military service.
Entered a company
I entered a company to fullfill my military service. There are special companies in Korea that helped to fullfill the military service. If I worked three years in the company, I would fullfill my military service. I got a job at Alticast which is a digital TV solution company. The related information : Alticast
January, 2000
Security seminar lecturer in LG electronics
I taught about the security, hacking, and hacker to the system administrators of LG electronics for five hours. The related information : lge.zip
Appeared on EBS television program
I appeared on EBS television program for 3 minutes.
Kyunghyang Sinmoon reporter interviewed me
Kyunghang Sinmoon reporter interviewed me. The related information : The article
February, 2000
Spoke over KBS radio
I spoke over KBS radio.
March, 2000
Helped D newspaper company
D newspaper company was hacked. After hacked, I hacked into the server and gave permission back to the administrator of the company.
Kyunghyang Sinmoon reporter interviewed me
Kyunghyang Sinmoon reporter interviewed me. The related information : The article
Security seminar lecturer in the 4th linux union seminar
I taught linux security to the linux users in 4th linux union seminar in the University of Seoul. The related information : Seminar pictures and the presentation files
April, 2000
inews24 reporter interviewed me
inews24 reporter interviewed me. The related information : The article
Dongailbo reporter interviewed me
Dongailbo reporter interviewed me. The related information : The article
June, 2000
Wrote Security PLUS for Unix
I wrote Security PLUS for Unix. The related information : Security PLUS for UNIX
July, 2000
Third place in the first world information security olymfair
I won the third place in the first world information security olymfair. I contributed the prize ( $10000 ) to relieving the poor. The related information : Olymfair homepage, The hacking technique of the winners, The article
September, 2000
Ohmynews reporter interviewed me
Ohmynews reporter interviewd me. I said about my opinion about the article of digital times. The article of digital times was same as the paper I had written one years ago. Digital times stole my paper. The related information : The article
Appeared on MBC web tonight
I appeared on MBC web tonight for 5 minutes.
October, 2000
Hanazine reporter interviewed me
The web magazine of Hanaro telecom, Hanazine, reporter interviewed me.
November, 2000
Relieved the poor
I gave all of the money of the first world information security olymfair prize to joongangilbo for relieving the poor. The related information: The article
May, 2001
Help unixian to pass level2 of the security olymfair 2001
Unixian told me to help himself to hack level2 of the security olymfair 2001, which is hacking competetion held in Korea. Therefore, I helped him to pass level2 because I am his good friend. :)) The related information: How could I hack level2 of the security olymfair 2001?
August, 2001
Got military education in the army for one month
In Korea, every man has to get military education to protect our country from the other countries. Therefore, I went to army to get military education. In the army, I learned how to use a rifle and grenade. ( I used real rifle and grenade. It was very dangerous. ). If the war occur in Korea, I will participate in the war to protect my country. The related information : My picture
2002
Worked very very hard in Alticast
I worked in Alticast very hard. I developed sun personal java virtual machine clone and ported CVM to many digital broadcasting settop boxes. I had used many ugly c compilers and embedded OSes.
January, 2003
Military service had been finished finally
I had done military service for three years. I would come back to postech and continue studying. I would study Electronic & Electrical Engineering as my second major.
March, 2003
Came back to postech
I started to study Electronic & Electrical Engineering. What would happen? :)
May, 2003
Created Oh! Text Hooker
For studying Japanese, I made Oh! Text Hooker. See Oh! Text Hooker project homepage, it's a very wonderful program for Japanese study ( Playing Japanese game ).
August, 2003
Wrote Embedded System FAQ
I have written embedded system faq for the newbie embedded system developers. It's in Korean.
September, 2003
Hackerslab interviewd me.
Hackerslab interviewed me. The related information : The article
November, 2003
Implemented electronic key lock and vending machine in schematic diagram.
I implemented electronic key lock and vending machine in schematic diagram with Altera MAX PLUS 2 10.2 for the digital system class term project. I tested both of implementation on HBE-COMBO training kit, and they works well. The related information : Electronic key lock, Vending machine
December, 2003
Implemented vending machine with 74-series TTLs.
I implemented vending machine with 74-series TTLS for the digital system class term project. It worked as I expected (very lucky). The related information : Photos
January, 2004
Implemented number baseball game and arkanoid with verilog HDL.
I implemented number baseball game with verilog HDL for the verilog HDL practice. It is my first verilog code. I tested it on HBE-COMBO training kit, and it worked well. And I implemented arkanoid with verilog HDL for the verilog HDL practice. It uses ps/2 keyboard, mouse, VGA and SRAM. Surely, I made all device drivers by myself. I used Altera Quartus II 2.2. The related information : Number baseball game, Arkanoid
February, 2004
Made a trip to Japan for a week.
I made a trip to Japan for a week. I had been to Australia (Sydney, Brisbane), the U.S. (L.A., Austin, Las Vegas), China (Hongkong, Shenzhen, Beijing) before. Japan is the fourth foregin country I have visited. I met several Japanese friends and they bought me a great dinner (Thanks!). I asked them to introduce me a job one or two years later. It was the first time for me to talk in Japanese. But I had no difficulties in having a communication with Japanese in Japanese. The related information : Photos
May, 2004
Visited Japan as a member of KSP.
I visited Japan as a member of KSP. We met various t-engine related people. And We met Ken Sakamura, too. The related information : Photos
September, 2004
Translated "T-Kernel Standard Handbook" into Korean
I translated "T-Kernel Standard Handbook" (written in Japanese) into Korean. T-Kernel is the new version of TRON which is famous RTOS in Japan. It is the first experience for me to translate a book.
November, 2004
Syskon lecturer about "JVM in the Settop Box"
I lectured in Syskon(System Kernel Conference) about "JVM in the Settop Box". I explained how to port, debug, and optimize JVM in the settop box platform. The related information : jvm.ppt
February, 2005
Graduated from Postech
I was graduated from Postech. I finished Electronic & Electrical Engineering as my second major.
June, 2005
Moved to Japan and got a new job
I had wanted to work abroad for long time. So, I decided to try to work in Japan at first. The new company I got to work for is Digital Media Professionals, mobile 3d chip design company. It took long time to get a Japanese working visa, so I couldn't come to Japan for 6 months after I decided to work in Japan. I moved to Musashino-shi Tokyo. The related information : My new house
December, 2005
Wrote how I had got a job in Japan
I wrote how I had got a job in Japan. It may be useful information for the Korean who wants to get a job in Japan. This is written in Korean. The related information : HTML, DOC
May, 2006
Wrote about maid cafe
I wrote about maid cafe. It may be useful information for the Korean who wants to go to the maid cafe in Japan. This is written in Korean. The related information : ohhara_maidcafe.txt
October, 2006
Wrote Japanese pachinko guide
I wrote about Japanese pachinko guide. It may be useful information for the Korean who wants to play pachinko in Japan. This is written in Korean. The related information : HTML, DOC
June, 2010
Left Digital Media Professionals
I left Digital Media Professionals(DMP). I have developed multiple 2D/3D GPUs in DMP for five years and one of them is used in Nintendo 3DS.
Left Japan and came back to Korea
I left Japan and came back to Korea to find my future wife.
Wrote how I had got a job in Japan part 2
I wrote how I had got a job in Japan part 2. This has information about how to live in Japan and how to leave Japan. This is written in Korean. The related information : HTML, DOC, ODT
July, 2010
Come back to Alticast
I came back to Alticast for Smart TV Revolution.
January, 2011
Demonstrated MHP Android Set-top box
I have integrated MHP based KT olle TV and Android into one Set-top box(Intel CE4150). You can watch olle TV, run MHP applications, and run android applications. The android applications can use MHP functionality by the application communication. This platform is demonstrated in CES 2011. The related information : Alticast Generates Buzz at CES 2011
January, 2012
Developed Alticast Windmill Interactive TV
I developed Alticast Windmill Interactive TV. I worked on the OpenGL ES based UI. The related information : Alticast Windmill interactive TV system and program guide
April, 2012
Got Married
Finally, I got married to my lovely wife, Minjung Lee. The related information : Wedding Photo
May, 2012
Moved to the USA
I moved to the USA as an expatriate engineer of Alticast. Alticast US is located in Broomfield, Colorado.
August, 2012
Supervised Korean translation of The OpenCL Programming Book written by Fixstars
I supervised Korean translation of The OpenCL Programming Book written by Fixstars. The related information : The OpenCL Programming Book
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