• Led software engineering team to develop wireless data products such as data cards, MiFi hotspot, USB dongle, and router, which adopted Qualcomm baseband chipsets. • Developed wireless data software drivers and application which is running on host machines.• Supported customers to integrate device drivers of wireless data products, which are adopted customer’s product as a connectivity device.• Interfaced with customers at all levels to get feedback/suggestion for new products as well as improvements to existing products. Provided technical training to sales team, distribution and sales channel partners.

• Alphean is a rebuilt of EoNex.• Led protocol software team to develop 3GPP R6/R7 compliant WCDMA/HSPA protocol stack, which is running on Alphean’s baseband modem.• Designed whole WCDMA/HSPA software architecture.• Designed and implemented WCDMA/HSPA Layer 2 RLC software – TM/UM/AM entities and bearer data handling to improve data throughput.• Led co-development of TD-SCDMA protocol software with Chinese company. Responsible for steering whole project and interfacing with Partner Company

• MediaTck acquired EoNex’ IP.• Led protocol software team to develop CDMA and EVDO protocol stack.• Designed Layer 2/3 software modules – LAC, MAC, Layer3 for CDMA-1xRTT, and MAC layer, Connection Layer and Session Layer protocols for EVDO.

• Led protocol software team to develop WCDMA/HSDPA and CDMA/EVDO protocol stack, which are running on EoNex' baseband modem.• Developed 3GPP R5 compliant WCDMA/HSDPA MAC layer protocol software running on EoNex' WCDMA/HSDPA chipset. Designed and implemented MAC layer software including MAC-d, MAC-hs, MAC-c/sh/m entities (2006-2008). • Developed TIA IS-856-A compliant 1xEV-DO Rev.A protocol software running on EoNex' CDMA2000 1xRTT/1xEV-DO Rev.A FPGA platform. Designed whole 1xEV-DO Rev.A protocol software architecture. Conducted inter-operability test with Samsung 1xEV-DO system in Samsung LAB (2006-2007).• Developed TIA IS-856 compliant 1xEV-DO protocol software running on EoNex' CDMA2000 1xRTT/1xEV-DO chipset. Designed whole 1xEV-DO protocol software. Designed interfaces between 1xEV-DO tasks and CDMA-1X tasks for hybrid operation. Implemented 1xEV-DO L3 task, which contains session layer and connection layer protocols. Implemented protocol APIs for data stack and UI. Conducted SFN test in Verizon Wireless LAB and got a SFN test approval from Verizon Wireless. Samsung Electronics adopted this product (EVDO Rev.0 chipset and software) and made trial handset (2003-2006).• Developed IS-2000 compliant CDMA2000 1xRTT protocol software running on EoNex' CDMA chipset. Designed whole CDMA2000 1xRTT protocol software architecture and protocol APIs. Implemented CDMA2000 1xRTT L3/L2 tasks and protocol APIs for UI. Conducted LAB test in LG Electronics and field test in SKT network. This product was commercialized in SKT through LG Electronics (The model number is LG SD-280) (2001-2003).

• Led cellular/data software team to develop PCS mobile phone for Korean operator LGT. Responsibility was to accommodate operator specific requirement and new features, especially system selection, interactive SMS, packet data service, and IrDA implementation for data service (2000-2001). • Designed and implemented WAP packet bearer in data software, and integrated IrDA protocol stack into legacy phone software for data services as a software engineer. This product was commercialized in LG Telecom (2000-2001).• Participated in a joint-project with Nokia R&D San Diego to develop CDMA mobile phone for Korean market as a cellular software engineer. Designed and Implemented CDMA packet data call processing including call origination, termination, service negotiation, and packet data server interface (1999-2000).• Participated in setting up Nokia Seoul R&D (1998-1999).

• Led BSC/BTS call processing software team as a technical lead in IS-95-B project (1998-1999). Designed high level BSC/BTS system architectures and its interfaces to accommodate IS-95-B features such as medium data rate service, enhanced soft/hard handoff capabilities, forward/reverse power controls, access handoffs, dynamic resource allocations for various services and etc. Especially for the data service, designed BSC-IWF interface said L-interface, dormant state procedures, RLP type2 for medium data rate, RLP-multiplex sub-layer interface, RLP-PPP interface, and supplemental code channel handling procedures.• Developed SDU call processing software as a call processing software engineer in J-STD-008 compliant PCS, and IS-95-A compliant CDMA cellular project (1995-1998). Designed and Implemented traffic state call processing software, which includes a call connection control, vocoder interface, soft/hard handoffs, service negotiation, forward power control using EIB and PMRM, reverse power control, service option 2/9 test call, multiplex sub-layer, 13kbps data services, RLP type1and PPP interface.• Developed BTU (BTS Test Unit) performing various tests and diagnostic functions on demand or periodically within BTS (1994). Designed and Implemented BTS test and diagnostic software. The functions of BTU were a remote test call, Tx and Rx antenna RSSI measurement, transmitting RF power level detection, temperature detection, overhead channel monitoring, service option 2 and 9 test calls, markov test call.