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Wafer Level Package of Optical devices Using Polymer Bonding
Kyounghwan Na,Ill hwan Kim,Eunsung Lee,Hyeon Cheol Kim,Kukjin Chun 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this thesis, study on thick, uniform and patterned interposer using polymer bonding for wafer level package of optical devices was performed. Two types of interposer were examined. First one is the type using SU-8 photoresist as interposer and as glue layer, also. The other is the type using patterned silicon wafer as interposer and dry film resist layer as glue. As results of experiments, SU- 8 layer which has 400㎛ of thickness and 3.25% of uniformity was formed and bonding strength between SU-8 and glass substrate was improved to maximum 9.43㎫ of tensile strength. And bonding layer which has maximum 32.5㎫ of shear strength and seals cavity hermetically was obtained by using DFR as glue layer between silicon interposer and glass substrate.
Kyounghwan Lee,나승열,Eun-Soo Kim 고려인삼학회 2015 Journal of Ginseng Research Vol.39 No.2
Background: A leaf cuticle has different structures and functions as a barrier to water loss and as protectionfrom various environmental stressors. Methods: Leaves of Panax ginseng were examined by scanning electron microscopy and transmissionelectron microscopy to investigate the characteristics and development of the epicuticular structure. Results: Along the epidermal wall surface, the uniformly protuberant fine structure was on the adaxialsurface of the cuticle. This epicuticular structure was highly wrinkled and radially extended to themarginal region of epidermal cells. The cuticle at the protuberant positions maintained the samethickness. The density of the wall matrix under the structures was also similar to that of the other wallregion. By contrast, none of this structure was distributed on the abaxial surface, except in the region ofthe stoma. During the early developmental phase of the epicuticular structure, small vesicles appearedon wallecuticle interface in the peripheral wall of epidermal cells. Some electron-opaque vesiclesadjacent to the cuticle were fused and formed the cuticle layer, whereas electron-translucent vesiclescontacted each other and progressively increased in size within the epidermal wall. Conclusion: The outwardly projected cuticle and epidermal cell wall (i.e., an epicuticular wrinkle) acts asa major barrier to block out sunlight in ginseng leaves. The small vesicles in the peripheral region ofepidermal cells may suppress the cuticle and parts of epidermal wall, push it upward, and consequentlycontribute to the formation of the epicuticular structure.
송경환(Kyounghwan Song),심재환(Jaehwan Shim),정정열(Jung-Yeul Jung),이충엽(Choongyeop Lee),남영석(Youngsuk Nam) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this work, we investigated the anti-fouling behaviors of titanium surface by varying the wetting morphology. We nanostructured titanium surfaces by applying hot alkali solution, which turned the surfaces into superhydrophilic. Then a silane was vapor-deposition on the surface to induce superhydrophobicity. Using the fluorescence image analysis, anti-fouling performance were extracted from the samples with different wetting morphologies, and their anti-fouling performance was quantitatively compared with that of untreated titanium sample. The results show that investigated superhydrphilic surface can improve the anti-fouling performance by approximately 90% in 12h. When the superhydrophobicity was induced after the silane treatment, the sample showed that approximately 80% increase in the anti-fouling performance of 48h. When the oil was infused on superhydrophobic surface, the sample showed over 80% increase in the anti-fouling performance in 8~72h. Our work provides the strategies to increase anti-fouling and will help develop titanium surfaces operating at various environment.