Lee K. – TechConnect Briefs

Preparation of charged droplets via electro-hydrodynamic spraying of polyelectrolyte solutions for the removal of floating particles with less than 10 um (PM10)

Lee K-I., Lee K., Lee K-I., Lee K., Kim S., Korea Electronics Technology Institute, KR

Ambient air quality tends to be worse due to the particle pollution in the region where the rapid commercialization is going on. Particulate matter (PM) describes fine inhalable particles with the specific diameter and smaller, [...]

The Brain-Machine Interface: Nanotechniques for Improving Brain Electrochemical Monitoring and Modulating

Andrews R., Bennet K., Chang S.Y., Koehne J., Lee K., Meyyappan M., Rand E., NASA Ames Research Center, US

Purpose: Present-day neuromodulation, e.g. deep brain stimulation (DBS), is limited by inefficient charge transfer from electrodes to brain tissue, lack of brain chemical (neurotransmitter) monitoring, and absence of feedback-guided stimulation. Although DBS using platinum macroelectrodes [...]

Direct Observation of Nanofabrication using the Optical Microscope combined with Nanopipette/QTF-AFM System

An S., Stambaugh C., Kwon S., Lee K., Kim B., Kim Q., Kim B., Kim Q., Jhe W., Seoul National University, KR

We demonstrated direct observation of nanofabrication using the optical microscope (OM) combined with nanopipette/QTF-AFM (Quartz Tuning Fork-Atomic Force Microscopy) system. Various solutions are ejected onto the substrate through the nano-/micro-aperture of the pulled pipette, and [...]

Integrated phase-Change memory in Bi2Te3 nanowires

Han N.A., Kim S.I., Yang J.D., Lee K., Sohn H., So H-M, Sohn H., Ahn C.W., Yoo K.H., Yonsei University, KR

Bismuth telluride (Bi2Te3) and its alloys are considered to be the best avaiable materials for near room-temperature thermoelectric applications. Moreover, because low-dimensional thermoelectric materials are expected to have a higher figure of merit due to [...]

Phenomena of Nanotube Formation on the Surface of Cp-Ti, Ti-6Al-4V, and Ti-Ta alloys

Lee K., Choe H.C., Ko Y.M., Brantley W.A., Chosun University, KR

In this study, the phenomena of nanotube formation on the surface of Ti alloys by electrochemical method. Nanotube layer formed on Ti alloys in 1 M H3PO4 and 1 M H2SO4 electrolyte with small additions [...]

Study of Thermal Efficiency Optimization in a Twin-bubble MEMS Micro-injector

Tang H-K, Tseng F-C, Wang W.W., Lee C-K, Lee I.Y., Lee K., Lee C-K, Lee I.Y., Lee K., Lee C-K, Lee I.Y., Lee K., BenQ Corporation, TW

In this paper, the methodology of design optimization to achieve optimal thermal efficiency of a twin bubble MEMS micro-injector is reported. This twin bubble back shooting structure can reduce the problems of crosstalk and satellite [...]

Low Temperature Volatile-Organic-Compound (VOC) Sensor Based on Tungsten Oxide Nanorods

Kim Y-S, Kim Y.T., Kim Y-S, Kim Y.T., Lee K., Electronics and Telecommunications Research Institute (ETRI), KR

Tungsten oxide sensors were fabricated by using highly crystalline and homogeneous WO2.72 nanorods, previously synthesized and characterized with average 75-nm length and 4-nm diameter [1]. They provide unique opportunities for investigating the effects of size-controlled [...]

CMOS RF Modeling and Parameter Extraction Approaches Taking Charge Conservation into Account

Je M., Kwon I., Han J., Shin H., Lee K., Korea Advanced Institute of Science and Technology, KR

A charge conserving small-signal equivalent circuit with very simple and accurate parameter extraction method for a three-terminal CMOS RF model is presented. We found that significant errors in circuit performances can be obtained if charge [...]

Investigation of the Mechanism of Floating Node Assisted CMOS Latch-Up

Sim S-P., Guo P., Kordesch A., Chen W.F., Liu C-M., Yang C.Y., Lee K., Santa Clara University, US

A new phenomenon of floating node assisted CMOS latch-up is experimentally observed and investigated using TCAD simulation. Using test structures having parasitic bipolar transistors and an electrically floating N+ diffusion node located at various distances [...]