• Title, Summary, Keyword: Adhesion

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Tongue-Lip Adhesion Using an Alveolar Protector Appliance for Management of Pierre Robin Sequence (피에르 로빈 연속증의 치료로써 치조 보호 장치를 이용한 혀-하순 유착술)

  • Lee, Jang-Won;Park, Beyoung-Yun
    • Archives of Plastic Surgery
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    • v.38 no.4
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    • pp.547-551
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    • 2011
  • Purpose: Pierre Robin sequence is a congenital malformation in which micrognathia causes glossoptosis and airway obstruction. If conservative treatment fails, surgical procedures such as tongue-lip adhesion can be performed. However, this procedure remains a subject of debate, with favorable results being countered by reports of complications. To overcome the above limitations, we revised the traditional method of tongue-lip adhesion using an alveolar protector. Methods: Between 1992 and 2011, a total of eight patients were identified with Pierre Robin sequence and were treated with tongue-lip adhesion. Two of these eight tongue-lip adhesion procedures were performed with an alveolar protector. The operative technique for tongue-lip adhesion was similar to that described in other published reports. The alveolar protector was inserted between the ventral surface of the tip of the tongue and the lower labial sulcus. Results: Tongue-lip adhesion failed in two patients because of wound dehiscence. The primary surgical success rate was 66.7%. In the two tongue-lip adhesion procedures performed with the alveolar protector, we observed no postoperative complications. Conclusion: Resistance to traction of the tongue can be encountered with nonunionized symphysis menti, causing loosening of the traction suture through the symphysis menti. This can lead to backward positioning of tongue, resulting in dehiscence of tongue lip adhesion. The alveolar protector is a good adjunct to tongue-lip adhesion because this method avoids postoperative loosening of the traction suture and wound dehiscence. It is a simple and effective auxiliary method that yields functional improvement.

Curing Behavior and Adhesion Performance of Urea-Melamine-Formaldehyde (UMF) Resin by Staged Addition of Melamine (멜라민 첨가 순서에 따른 UMF 접착제의 경화거동과 접착력의 영향)

  • Xu, Guang-Zhu;Eom, Young-Geun;Lee, Young-Kyu;Lim, Dong-Hyuk;Lee, Byoung-Ho;Kim, Hyun-Joong
    • Journal of Adhesion and Interface
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    • v.10 no.2
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    • pp.84-89
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    • 2009
  • The objective of this research was to investigate the curing behavior and adhesion performance of urea-melamine-formaldehyde (UMF) resin for the four types of UMF-1, UMF-2, UMF-3, and UMF-4 which synthesized by the staged addition of melamine. Also, various network structures of these resin types were discussed based on their different curing behavior and adhesion performance. The curing behavior was evaluated by DMTA and thermal stability was checked by TGA. Adhesion performance was evaluated by dry and wet shear strengths and the pH value of each cured resin was checked to see its effect on the adhesion performance. The results indicated that the UMF-1 resin type by the addition of melamine initially with the urea and formaldehyde at the same F/(U+M) rate showed the lowest thermal stability, rigidity (${\Delta}E^{\prime}$), temperature of tan ${\delta}$ maximum ($T_{tan}\;_{\delta}$), and wet shear strength, and pH value of cured resin. In wet shear strength, however, the UMF-4 resin type appears to be slightly higher than UMF-1 resin type.

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Effect of Tea Polyphenols on the Adhesion of Highly Metastatic Human Lung Carcinoma Cell Lines to Endothelial Cells in Vitro

  • Zheng, Feng-Jin;Shi, Lin;Yang, Jun;Deng, Xiao-Hui;Wu, Yu-Quan;Yan, Xi-Qing;Huang, Ning
    • Asian Pacific Journal of Cancer Prevention
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    • v.13 no.8
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    • pp.3751-3755
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    • 2012
  • Aim: Tea polyphenols are known to play roles in critical steps of human lung carcinoma cell metastasis. For understanding the mechanisms whereby they inhibit tumor metastasis, the present study was conducted to investigate their effects on the adhesion of highly metastatic lung carcinoma cell lines (PG cells) to endothelial cells (EC cells) and adhesion molecule expression in vitro. Methods: The expression of CD44 or CD54 in the PG cells was detected by flow cytometry and adhesion of PG cells to EC cells was assessed by confocal microscopy double fluorescence staining. Results: The results showed that tea polyphenols: (1) inhibited the expression of CD44 and CD54, two important adhesion molecules in the PG cells in a dose-dependent manner; (2) significantly blocked the adhesion of PG cells to EC cells not only in a state of rest but also when active; and (3) influenced CD44 and CD54 expression during the adhesion process of PG cells to EC cells. Conclusions: The data indicated that the blocking role of tea polyphenols in the adhesion of PG cells to EC cells is related to CD44 and CD54. The mechanism of tea polyphenol prevention of human lung carcinoma metastasis might be through inhibiting adhesion molecule expression to block cancer cell adhesion.

An Experimental Study on the Nano-adhesion of Octadecyltrichlorosilane SAM on the Si Surface (OTS SAM의 미소 응착 특성에 관한 실험적 연구)

  • 윤의성;박지현;양승호;한흥구;공호성
    • Tribology and Lubricants
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    • v.17 no.4
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    • pp.276-282
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    • 2001
  • Nano adhesion between SPM (scanning probe microscope) tips and 075 (octadecyltrichlorosilane) SAM (self-assembled monolayer) was experimentally studied. Tests were performed to measure the nano adhesion and friction in both AFM(atomic force microscope) and LFM(lateral force microscope) modes in various conditions of relative humidity. OTS SAM was formed on Si-wafer (100) surfaces, and Si$_3$N$_4$ tips of different radius of curvature were used. When the surface was hydrophobic, the adhesion and friction forces were found lower than those of bare Si-wafer. Results also showed that micro-adhesion force increased as the relative humidity and the tip radius of curvature increased. The main parameter for affecting the micro-adhesion was found absorbed humidity on the contact surface. These results were discussed with the JKR model and a capillary force caused by absorbed water.

Hybrid Re-Adhesion Control Method for Traction System of High-Speed Railways with Parallel Induction Motor Control (유도전동기 병렬 제어형 고속전철 추진시스템의 혼합형 재점착 제어기법)

  • Hwang, Don-Ha;Kim, Mun-Seop;Ryu, Hong-Je;Park, Do-Yeong;Kim, Jong-Su
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.1
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    • pp.40-47
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    • 2002
  • This paper describes a re-adhesion control method for the Korean High-Speed Train (KHST) with parallel induction motor drive. To keep a traction efficiency and to improve vehicle maintenance, the adhesion characteristics between wheel and rail are analyzed. Also the re-adhesion controller is designed as the subsystem of induction motor vector control. In order to verify performance of the proposed control techniques, the simulation is executed by train model and a downscaled re-adhesion control simulator is utilized. Both simulation and running test results show that good re-adhesion characteristics are obtained.

Adhesion between Cu-18wt% Cr Alloy Film and Polyimide : Effect of Heat Treatment (Cu-18wt% Cr 합금박막과 폴리이미드사이의 접착력 : 열처리 영향)

  • 임준홍;김영호;한승희
    • Journal of the Korean institute of surface engineering
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    • v.26 no.6
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    • pp.327-333
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    • 1993
  • The effect of heat treatment on the adhesion between Cu-18wt% Cr film and polyimide has been studied by using T-peel test, AES, and XRD. Cu-18wt% Cr alloy and pure Cu films were sputter deposited onto pol-yimide. Cu was electroplated before and after heat treatment at $400^{\circ}C$ for 0.5 hr and 2 hrs respectively. The adhesion of metal film onto polyimide was considerably good before heat treatment, but heat treatment re-duced the peel adhesion strength in all specimens. The reduction in adhesion in adhesion strength values in the specimens which were plated after heat treatment was mainly due to Cr-O rich pahse formed in the metal/polyimide in-terface. In the specimens which were heat treated after plating, the enhanced ductility in the metal films con-tributes the peel adhesion strength by increasing the amount of deformation in metal strips.

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Changes in Adhesion Interface between Rubber and Steel Cord with Aging Treatment (열화처리에 따른 고무와 강선코드간 접착계면의 변화)

  • Seo, Gon;Sohn, Bongyoung
    • Applied Chemistry for Engineering
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    • v.5 no.4
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    • pp.630-636
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    • 1994
  • The changes in adhesion interface between rubber compound and brass plated steel cord after various aging treatments were studied by using an Auger electron spectrometer and a scanning electron microscope. After thermal aging, partial oxidation and additional growth of adhesion layer were observed. The adhesion layer and brass were partially removed after humid aging. With dynamic aging the adhesion layer was destroyed and the corrosion of steel core was proceeded. The changes in adhesion interface were discussed in terms of the adhesion properties determined from the stress-strain experiments.

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Influence of Parameters on Adhesion Strength on TiN Film by using R.F. Plasma Assisted Chemical Vapor Deposition (PACVD로 증착된 TiN 박막의 밀착성에 관하여)

  • Shin, Y.S.;Kim, M.I.
    • Journal of the Korean Society for Heat Treatment
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    • v.3 no.1
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    • pp.17-24
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    • 1990
  • In this study, TiN film was deposited onto steel by R.F.-PACVD in order to investigate the influence of parameters on the adhesion strength between film and substrate. Experimental results showed that adhesion strength by SAT is different from by optical microscopy. Adhesion strength is increased when the deposition temperature increases and is influenced by R.F. power and electrode distance. Especially heat treatment on the substrate has influenced over the adhesion strength, so it showed the 22 Newtons in adhesion strength by SAT and adhesion strength is decreased when deposition thickeness is thick and hardness is high. Also if the film is thick and high hardness simultaneous, the film was delaminated seriously.

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The Effects of Surface Energy and Roughness on Adhesion Force (표면에너지와 거칠기가 응착력에 미치는 영향)

  • Rha, Jong-Joo;Kwon, Sik-Cheol;Jeong, Yong-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.11
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    • pp.1335-1347
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    • 2006
  • Surface energies calculated from measured contact angles between several solutions and test samples, such as Si wafer, $Al_2O_3$, $SiO_2$, PTFE(Polytertrafluoroethylene), and DLC(Diamond Like Carbon) films, based on geometric mean method and Lewis acid base method. In order to relate roughness to adhesion force, surface roughness of test samples were scanned large area and small by AFM(Atomic Force Microscopy). Roughness was representative of test samples in large scan area and comparable with AFM tip radius in small scan area. Adhesion forces between AFM tip and test samples were matched well with order of roughness rather then surface energy. When AFM tips having different radius were used to measure adhesion force on DLCI film, sharper AFM tip was, smaller adhesion force was measured. Therefore contact area was more important factor to determine adhesion force.