The analysis of eye blinking pattern using high-frame-rate camera.

The purpose of this study is to analyze eye blinking patterns using high-speed camera without additional instructions and illuminations. The experimental video clips are taken at 240 frames per second, which is twice the flickering rate of room light. The eye blinking sequences are segmented from the whole video clip after reducing noise and baseline wander. The shapes and positions of the upper eyelid in blinking sequences are evaluated by a polynomial curve fitting algorithm and visualized to the eyelid position graph. The graph made it easy to recognize the eye blinking patterns. In order to analyze patterns, eye blinking parameters are calculated, and an eye blinking cycle is divided into three phases as `Closing phase', `Closed phase', and `Opening phase'. In the experiments with forty volunteers, proposed method can analyze eye blinking patterns qualitatively.

Simple and fast polydimethylsiloxane (PDMS) patterning using a cutting plotter and vinyl adhesives to achieve etching results.

Inhibition of polydimethylsiloxane (PDMS) polymerization could be observed when spin-coated over vinyl substrates. The degree of polymerization, partially curing or fully curing, depended on the PDMS thickness coated over the vinyl substrate. This characteristic was exploited to achieve simple and fast PDMS patterning method using a vinyl adhesive layer patterned through a cutting plotter. The proposed patterning method showed results resembling PDMS etching. Therefore, patterning PDMS over PDMS, glass, silicon, and gold substrates were tested to compare the results with conventional etching methods. Vinyl stencils with widths ranging from 200µm to 1500µm were used for the procedure. To evaluate the accuracy of the cutting plotter, stencil designed on the AutoCAD software and the actual stencil widths were compared. Furthermore, this method's accuracy was also evaluated by comparing the widths of the actual stencils and etched PDMS results.