Teaching Korean mathematics to high school, middle school, and elementary school students.1:1 video classes: overseas and domestic.

- Sourced and managed the Korean companies to project new projects of IWOW, Singapore company in Singapore, and supported the technical parts- GPS Location Tracking System (inner operation range: 2 meter)- OBU (On Board Unit) project with G-Sensor - Range Detector Sourcing- 450Mhz CDMA Modem Sourcing

- Managed the overall and the finance of the company

- Developed and Managed MMI Software of Samsung Low cost GSM phone with Locosto-Lite chip of TI by contacting TI world wide engineers directly as the korea agent of IWOW in Singapore.- Supported and managed the field test issues of Frankfurt in German, Istanbul in Turkey, Dubai in UAE, London in UK, Paris in France and Milano in Italy and supported the mass production of this product after completing the development- Managed the development of LCD Panel measure equipment system and the business for Samsung and LG Philips

- Managed the Field Application team- Handled the Backend IC of Camera Application Processor and Multimedia Application Processor - Managed all domestic Phone design companies like Samsung in Suwon and Gumi, LG, Pantech, Curitel, VK, Bellwave and small companies- Managed the phone design companies in China and Taiwan and Europe

- Planned and managed the new business development- Managed the Business for getting CDMA ODM Development with Latin America’s customers- Developed and Managed the Development of Tri band (900Mhz, 1800Mhz and 1900Mhz) GSM/GPRS Phones Phone Size : 84.5mm x 46mm x 22.4mm Main Function : Dual LCD Folder Phone, Internal LCD : 64K Color(128 x 160), External LCD : 4K Color, 40 Poly Yamaha Melody, WAP,

- Was charged with Engineering Chief of Hanwha / Telecommunication Div. Design Center that has maximum 50 persons of Software team, Hardware Team, Mechanical Team and Supporting Team- Managed the software team, Hardware Team and Mechanical Team for developing CDMA Cellular Phone and also managed the CDMA Cellular Phone projects by using Qualcomm Chipset and designed the software- Developed 800Mhz CDMA 1X Cellular Phone for China Unicom of China Market Phone Size : 84mm x 44mm x 19mm Main Function: Dual LCD Folder Phone, Internal LCD : TFT Color LCD(128 x 160), External LCD : B/W LCD UIM Card, 16 Poly Melody, External Camera- Developed 800Mhz 95B Cellular Phone for China Unicom of China Market and Vietnam Phone Size : 80mm x 43mm x 23mm Main Function: Dual LCD Folder Phone, Internal LCD : 4 Gray Color LCD(128 x 128), External LCD : B/W LCD UIM Card-. Developed 95B Tri-mode (AMPS, CDMA, PCS) Cellular Phone for Verizonin USA Phone Size : 80mm x 40mm x 25mm Main Function: Folder Phone, AMPS and CDMA for 800Mhz and PCS for 1800Mhz, 4 Gray LCD, UP, PC Link, etc

- Managed the Software Team that has maximum 30 software engineers in Motorola Korea Engineering Center of PCS- Developed the Software of CDMA 800Mhz and 1900Mhz Cellular Phone by using Qualcomm Chipset for SK Telecom, Shinsegi, KT freetel, Hansol and LG Telecom of Korea Market.- Delivered the Motorola’s technique about the pager information service to allpager operators.- Supported the Flex technical issues of all pager operators (SK Telecom and All 2nd RCC operators) in their system and the field and analyzed and solved them.- Supported the technical questions and issues about the Motorola two-way protocol (Reflex and Inflexion) to the operators.- Setup Motorola Pager Korea R&D Center in Korea Seoul directly with the Motorola Singapore team’s supports.And was worked as a Chief of Motorola Korea R&D Center that has maximum 15 engineers with Software Team, Hardware Team, Mechanical Team and Industry Design Team.And managed the Pager development Project of Korea R&D Center and also designed the software and managed the software team directly.

- Developed three Pagers of Motorola with the assembler and C language as a software engineer in Singapore for 7 months with the Motorola engineers in Singapore.

- Developed CDMA Cellular Phone software by using Qualcomm Chipset and also managed 10 software engineers as the software team leader.- Developed the Pager software with the assembler and C language and Assembler and launched the five products.

- Developed the Korean Operating system software of the personal Computer with the C language- Developed the Korean Terminal of IBM computer with C language and the Assembler.- Developed the Korean Dot Matrix Printer with the Assembler language