Contributed to migrating RTOS(from ECOS to Zephyr) in Embedded Controller

• https://review.coreboot.org/plugins/gitiles/chrome-ec/+/c7641168a60cae345bddc5566bd7bf7aedd4d1ed/docs/zephyr_shim.md

• Implement a shim layer to make ECOS(RTOS)'s Motion Sense framework available in Zephyr(RTOS)

• https://chromium-review.googlesource.com/q/owner:hyungwoo+zephyr

Firmware development for Intel Sensor Hub

• Designed & implemented HID subsystem/HECI/IPC

• Contributed to porting Chrome ECOS into Intel Sensor Hub

• Codes in open source

https://chromium.googlesource.com/chromiumos/platform/ec/+/fe24755501c10405f02da94f3179ceb0bcde4fc3%5E%21/

https://chromium.googlesource.com/chromiumos/platform/ec/+/a2c87e75cc5b42b900832f0e80244c077b497f2c%5E%21/

https://chromium.googlesource.com/chromiumos/platform/ec/+/737317a19e54bb4dfa4d646b11354b4a9d275791%5E%21/

https://chromium.googlesource.com/chromiumos/platform/ec/+/193a3c47ad8af6528ff1605a4595fc7367a09834%5E%21/

https://chromium.googlesource.com/chromiumos/platform/ec/+/decc9452e981a7c8ce5c6b8983061a054057c615%5E%21/

and many small patches(https://chromium-review.googlesource.com/q/owner:hyungwoo+yang)

Author of Intel Precise Touch for Linux

• utilize SPI, Intel ME, and OpenCL in GPU

Author of ov13858 camera sensor driver in upstream kernel

• https://github.com/torvalds/linux/commit/5fcf092e0c9fb4895096c8809cf1fb9ba1349653#diff-5b95ea25e00733660f2c079693507cd0

Thermal Management

• in charge of skin temperature management for various products

• Developed (completely new) Adaptive Skin Thermal Governor (used by NEXUS 9 with android 5.1)

Developed key provisioning mechanism - Encrypted Keystorage, provisioning keys to secure sevices in ARM TrustZone

Developed secure services ( e.g. google widevine, hdcp ) in ARM TrustZone

Technical Leader.

Device drivers : ALS, MMC and etc.

S/W performance measurement and analysis.

Project : Developing Image Framework for Image Processing Algorithm developers

• Designed&Implemented HAL layer to support all platforms(Symbian, Windows, and Linux)

• Designed&implemented Metadata API

• Designed&implemented platform independent algorithm loading/unloading mechanism to enable chaining algorithms

Project : Face detection & tracking and recognition

• S/W performance measurement and analysis

• Optimized the algorithms and enabled 30fps-15 faces with QVGA in ARM11(320Mhz)

Baseporting for SGH-Z600

• developed device drivers : camera, LCD, SD card, pseudo DD for debugging.

• implemented CrashLogger to dump key objects in Symbian when kernel is locked up.

Developed WIPI( Mobile Platform ) for Symbian

Developed Anti-virus vaccine framework for Symbian