* Due to NDA issues, the following excludes the works conducted at the Microsoft Applied Sciences Group.
Zero-power Contactless Probing for IMDs

Zero-power Contactless Probing for IMDs

TeleProbe: enabling oscilloscope-like fine granularity analog and digital signals monitoring for implantable medical devices (IMD) with zero-power overhead on the IMD being monitored.

Vibration-based Side Channel for IMDs

Vibration-based Side Channel for IMDs

SecureVibe: proposing vibration-based secure side channel between an external device and a medical device. The intrinsic user-perceptible and short-range properties of vibration enable physically secure communication at low energy and size overhead.

Energy Harvesting from an Idle Sensor

Energy Harvesting from an Idle Sensor

Senergy: perpetually operating battery-less micro-scale energy harvesting platform that multiplexes the purpose of a photodiode sensor into either a sensing element during an active time and a power source during idle time.

Computation across Power Cycles

Computation across Power Cycles

QuickRecall: HW/SW approach for computing across power cycles in transiently powered computers by storing and restoring the computation states into and from nonvolatile FRAM.

Coprocessor-augmented Network Monitoring

Coprocessor-augmented Network Monitoring

SPI-Snooper: co-processor-augmented HW/SW architecture that enables non-intrusive and transparent network monitoring in wireless sensor networks.

Bladder Pressure Sensing IMD

Bladder Pressure Sensing IMD

UP-Link: ultra-low power biomedical implantable wireless pressure sensor device measuring the internal pressure of bladder for 13 years without battery replacement (1 packet transmission per an hour). Demonstrated proven reliability from in-vivo animal test.

Cloud-offloaded GPS

Cloud-offloaded GPS

CLEO: HW platform for location sensing, which leverages the proposed cloud-offloaded GPS (CO-GPS) technology. Achieves three orders of magnitude less power consumption as compared to the conventional GPS technology.

WWVB receiver

WWVB receiver

Wireless global clock receiver that captures WWVB radio-controlled time sync signal. Enables globally synchronized operations for a highly geo-distributed environmental sensing systems where post-deployment time synchronization is infeasible.

Home Automation

Home Automation

Research on the architectures and protocols of wireless sensor networks for home automation. Developed a wired-wireless (KNX-ZigBee) unified home network system that achieved maximized energy efficiency as well as user convenience.

Lighting Control

Lighting Control

Interoperability is one of the key properties toward the wide adoption of control networks technology in the market. Developed a network stack to transform proprietary protocol-based devices into an international standard (KNX) compatible devices.

Building Automation

Building Automation

Research on the architectures and protocols of wireless sensor networks for building automation. Developed a wired-wireless (BACnet-ZigBee) unified building network system as a core infrastructure for Smart-grid.

Smart-grid

Smart-grid

As a core application that demonstrates the use of Smart-grid technology, developed an energy-efficient lighting control system that operates a demand-responsive algorithm on the BACnet over ZigBee infrastructure.

Smart meter

Smart meter

The smart-meter is a wall outlet pluggable wireless power measurement device built based on the IEEE 1451 (Smart Transducer Interface) standard. It decouples the network protocol dependency by adopting a standardized network interface.

Power Plant Control

Power Plant Control

For maximized reliability and availability in the gasification power plant operation, developed a PROFIBUS redundancy switch that supports seamless transition between operational- and backup-masters.

Industrial Networks

Industrial Networks

As a certified testing engineer of the accredited CC-Link testing facility, conducted conformance tests for every commercial CC-Link control network devices newly developed in South Korea.

Standardization

Standardization

Worked as a delegate of Korea and an organizing secretary for IEC and KATS, respectively, to standardize an industrial network protocol, RAPIEnet. As a member of the standardization task force, I standardized an Ethernet-based industrial automation network protocol, RAPIEnet, as IEC/PAS 62573.