• 유체기계공업학회:학술대회논문집
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• 2006.08a
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• pp.297-300
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• 2006

This article discusses about the droplet movement on the super-hydrophobic surface by the electro-wetting on dielectric and the effect of particles on the contact angle as well as the movement is investigated. The movement of droplet, driven by the principle of electro-wetting on dielectric, and the effect of particles are experimentally verified according to the driving voltage and different particles concentrations (fluorescent, charged particles). To increase the contact angle, the super-hydrophobic surface is fabricated and applied to the dielectric layer for the EWOD device. Then its performance is verified and discussed.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.20 no.2
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• pp.173-177
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• 2007

Electro-wetting display (EWD) that displays information by controling movement of fluid is one of the strong candidates for electronic paper display (EPD). In EWD cell. the movement of oil which locates between hydrophobic insulation layer and deionized water is rather random, which makes it difficult to realize gray scale, fast response time, and good color characteristics. In this paper, we investigated how to control the oil movement in specific one direction by surface treatment and pattered electrodes. From these experiments, we could control oil movement in a desired direction.

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.05a
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• pp.23.2-23.2
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• 2007

• Korean Journal of Optics and Photonics
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• v.17 no.4
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• pp.347-353
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• 2006

The electro-wetting effect can be implemented as a fast means to move liquid interfaces. A continuous and numerical method would be required in measurement of electro-wetting liquid interfaces. We propose an /in-situ/ measurement method to characterize the dynamic change in curvature of liquid interfaces. In the proposed method, variation of light intensity transmitted through the liquid interfaces is measured, leading to numerical determination of the liquid curvatures. Experimental results obtained from our efficient method are confirmed by the direct images of a streak camera.

• Proceedings of the Korean Society of Rheology Conference
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• 2006.06a
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• pp.5-5
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• 2006

• The KSFM Journal of Fluid Machinery
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• v.18 no.6
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• pp.27-30
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• 2015

In this study, we attempted to harvest energy using water droplet based on Reverse Electro Wetting On Dielectric (REWOD) phenomenon between water droplet and dielectric surface without external bias. REWOD device can be fabricated via simple coating process, which is highly economic and easy. We believe that our system is well-suited for IoT(Internet of Things) embedded electronics that require low but consistent electricity. Moreover, our device can be integrated with window to generate electricity upon raindrops.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2011.05a
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• pp.184-185
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• 2011

In this study, in order to obtain a high reflectivity for the LED lead frame, tin dip coating and tin plating were conducted respectively, and wettability of LED lead frame with tin solder also was tested by wetting balance tester. A Cu sheet was plated in Cu brighten electroplating bath and followed by immersion in a Sn electro-less plating bath [1]. On the other hand, in the dip coating process, a Cu sheet was dipped into molten tin. In the progress of wetting test, besides wetting balance curve, the maximum measured force($F_m$), the maximum withdrawal force($F_w$) and zero-cross time($t_0$) were obtained in various temperatures. With the maximum withdrawal force, the surface tension was calculated at different temperatures. The Cu sheet plated with bright Cu and Sn show a silver bright property while that of Cu dipped with Sn possessed a high reflectance density of 1.34GAM at $270^{\circ}C$.

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.05a
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• pp.27.1-27.1
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• 2007

• The Journal of Pediatrics of Korean Medicine
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• v.19 no.1
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• pp.103-115
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• 2005

Objectives : Nocturnal enuresis is common disorder in children and has important negative effects on the self-image and performance of children. Thus Successful treatment needed to increase self-esteem. Many studies of this symptoms were reported. But electro-acupuncture treatment not reported in Korea. Methods : We treated three cases enuretic children with different types. Their diagnosis were non-monosymptomatic primary, monosymptomatic primary, monosymptomatic secondary nocturnal enuresis. We used electro-acupuncture on Zhongji(CV3), Guanyuan(CV4) for 20 min. To investigate relapse. at least for 4 months after the end of the therapy we followed-up by telephone. Results : After treatment, diurnal urinary symptoms, such as increased frequency of urination, urgency, incontinence were dramatically improved. And the number of wet night decreased with nocturia and delayed wetting time. Compared to pre-treatment, findings, the number of wet nights decreased 80% or more. Conclusion : All of them tolerated electro-acupuncture well and kept reduction at least for 4 months follow-up. Further study is needed with more cases.

• Journal of Information Display
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• v.7 no.2
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• pp.12-15
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• 2006

We propose a patterning method of liquid crystal (LC) alignment layer for producing multi-domain LC structures. By controlling thermal conditions during micro-contact printing procedures and facilitating wetting properties of patterning materials, patterned LC orientation can be easily obtained on a bare ITO surface or other polymer films. The newly proposed patterning method is expected to be a very useful tool for fabricating multi-domain LC structures to enhance or design electro-optic properties of LC-based devices.