• 한국응용과학기술학회지
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• 제25권4호
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• pp.525-532
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• 2008

To prepare a solution type acrylic pressure-sensitive adhesive, quarter polymers were synthesized from butyl acrylate(BA), 2-ethylhexylacrylate(2-EHA) as a base monomer, methyl methacrylate(MMA) as a comonomer, each of methacrylic acid(MAA), acrylic acid(AA) as a functional monomer. Acrylic solution type pressure-sensitive adhesives(PSA's) of isocyanate derivative crosslinking PSA's were prepared by crosslinking of BEMM, BEMA with toluene-2,4-diisocyanate. The structure of adhesive was identified by FT-IR. The viscosity was measured by using Brookfield DV-III and molecular weight was measured by using gel permeation chromatography. The physical properties of polyethylene film coated with BEMMT, BEMAT were measured as a function of the concentration. As the result, BEMMT(0.6, 0.8), BEMAT(0.6) showed peel adhesion of $160{\sim}180\;g_f$/25 mm width and shear adhesion of more than 24 hours, and tackiness of $4/32{\sim}6/32$ which was relevant to commercial usage.

• 대한소아치과학회지
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• 제37권3호
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• pp.308-316
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• 2010

상아모세포는 부착분자들을 이용하여 기질에 부착하는 세포이며, 인테그린과 같은 부착분자들이 일련의 세포와 세포외기질을 인지하는 신호전달분자로 알려져 있다. 본 연구의 목적은 상아모세포(MDPC-23 세포)와 I형 아교질과의 상호작용과 TGF-${\beta}1$과 TNF-${\alpha}$가 세포부착분자의 발현에 미치는 영향을 알아보기 위해 시행하였다. 본 연구에서 MDPC-23 세포는 농도의존적으로 I형 아교질에 부착했으며, 면역형광염색법에서 MDPC-23 세포가 아교질에 부착할 때, 국소부착점에서 인테그린 ${\alpha}1$, ${\alpha}2$, CD44, FAK 그리고 paxillin의 발현양상을 관찰할 수 있었다. 싸이토카인 TGF-${\beta}1$은 MDPC-23 세포의 아교질에 대한 부착성 및 인테그린 ${\alpha}1$, ${\alpha}2$와 chondroitin sulfate의 발현을 증가시켰으며, RT-PCR의 결과에서는 인테그린 ${\alpha}1$의 mRNA의 양이 TGF-${\beta}1$에 의해서 증가되었음을 확인하였다. 결론적으로 MDPC-23 세포는 아교질에 부착 친화성을 갖고 있으며, 부착 시에 인테그린 ${\alpha}1$, ${\alpha}2$와 CD44 그리고 chondroitin sulfate와 같은 부착분자들이 관여한다. 그리고 TGF-${\beta}1$은 인테그린 ${\alpha}1$, ${\alpha}2$ 그리고 chondroitin sulfate와 같은 부착분자의 발현을 증가시켰다.

• 정보저장시스템학회:학술대회논문집
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• 정보저장시스템학회 2005년도 추계학술대회 논문집
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• pp.75-80
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• 2005

Study for toner adhesion is known as an important role in electrophotography. In this research, a centrifugal detachment method was used to measure the adhesion force of several hundred particles simultaneously and to determine its sensitivity to particle size. For uncharged toner particles, we estimated the van der Waals force based on the centrifugal farce experiments. Then for charged toner particles, the centrifugal force experiments were carried out. The difference between the results for charged toner particles and the results for uncharged toner particles was compared with the image force calculated from a model which assumed that the toner charge was located at the center of the particle. In the calculations, experimental data obtained by E-SPART (Electrical- Single Particle Aerodynamic Relaxation Time) analyzer were used. The adhesion force of micro-sized toner particles deposited on the DR surface was found to be approximately 1${\~}$3 nN.

• 정보저장시스템학회논문집
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• 제2권2호
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• pp.105-110
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• 2006

Study for toner adhesion is 3non as an important role in electrophotography. In this research, a centrifugal detachment method was used to measure the adhesion force of several hundred particles simultaneously and to determine its sensitivity to particle size. For uncharged toner particles, we estimated the van der Waals force based on the centrifugal force experiments. Then for charged toner particles, the centrifugal force experiments were carried out. The difference between the results for charged toner particles and the results for uncharged toner particles was compared with the image force calculated from a model which assumed that the toner charge was located at the center of the particle. In the calculations, experimental data obtained by E-SPART (Electrical-Single Particle Aerodynamic Relaxation Time) analyzer were used. The adhesion force of micro-sized toner particles deposited on the DR surface was found to be approximately $1{\sim}3$ nN.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.1-4
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• 2005

This study is to examine adhesion the characteristics of self adhesive asphalt to minimize of the construction periods and the environmental problems through the performance estimation of materials to reduce waterproof problem and the long durability maintenance of building structures. This study tested the estimation items of self rubberized adhesive asphalt to examine the sheet discovered the most important problem in the construction site and the connection stability in the sheet joint. Besides, this study examined the material characteristics such as tension property, tear property, temperature dependence, heat resistance, adhesion stability and so on. Test results of the separative items satisfied in the reference figure of connection stability and adhesion stability which could confirm adhesion performances and other items also satisfied in the reference.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2004년도 학술대회지
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• pp.83-89
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• 2004

In this paper, molecular dynamics simulations are performed to analyze the adhesion between a diamond mould and a copper substrate in diamond nanoimprint lithography. The diamond nanoimprint lithography process is simplified as punch-type nanoindentation. The copper substrates are assumed to monocrystalline and defect free and consist of $22500\~80000$ atoms depending on their dimension. The diamond moulds consist of 916 or 2414 atoms, which is assumed to be rigid. The consistent results lot the maximum normal force and the adhesion force are obtained regardless of the size of substrates and the adhesion hysteresis is shown in all cases. It is found that the friction acting on the sidewalls of the mould affects the adhesion significantly when the mould is released from the substrate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 춘계 학술논문 발표대회
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• pp.232-233
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• 2017

The purpose of this study is to evaluate the Adhesion in tension of cement mortar according to adding admixtures such as polymer dispersions, blast-furnace slag and fly ash. From the test results, the adhesion in tension is seriously affected by type of polymer compared with polymer-binder ratios and types of admixture. The maximum adhesion in tension of EVA- modified mortar is about 1.46 times, the cement mortar. It is apparent that the adhesion in tension of polymer-modified mortars according to adding two admixtures is much more improved irrespective of polymer-binder ratio.

• 통합자연과학논문집
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• 제9권3호
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• pp.171-176
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• 2016

Rap1 is a key regulator of cell adhesion and migration. Although increasing evidence indicates that the Rap1 signaling pathway is involved in the process of bone remodeling, the mechanism by which Rap1 regulates osteoblastic differentiation and cell adhesion remains unknown. Here, we investigated the morphological characteristics and osteoblastic differentiation of cells expressing constitutively activated form of Rap1A (Rap1ACA) or Rap1 GTPase activating protein Rap1GAP and found that activated Rap1 induces osteoblastic differentiation and cell adhesion as well as cell spreading. When osteoblastic differentiation was induced, Rap1ACA cells showed considerably higher levels of calcium deposits than the wild-type and Rap1GAP-overexpressing cells did. Rap1ACA cells showed increased spreading and size, as well as strong cell adhesion and significantly decreased growth rates. F-actin staining using phalloidin revealed several thin thread-like filopodia around the protrusions in Rap1ACA cells, which possibly contribute to the increased cell adhesion.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.128-129
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• 2020

In this study, flexural strength and tile adhesion strength were evaluated by using a mortar, dry mortar and an epoxy resin reinforced mortar to examine the adhesion performance by reinforcing the epoxy resin adhesive. As a result, it was clearly confirmed that the effect of improving the adhesion strength by reinforcing the epoxy resin adhesive regardless of the type of tile, and in particular, when applying the epoxy resin adhesive to the porcelain and polishing tiles, it is judged that sufficient adhesion performance can be secured.

• Archives of Plastic Surgery
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• 제46권4호
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• pp.330-335
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• 2019

Background The use of anatomic implants has improved the aesthetic results of breast surgery; however, implant malrotation is an uncommon, but serious complication of these procedures. Nevertheless, little research has explored implant adhesion. In this study, we investigated adhesion between the expander and the capsule. Methods Seventy-nine cases of immediate breast reconstruction via two-stage implant-based reconstruction performed between September 2016 and November 2017 were evaluated. Mentor CPX4 expanders were used in 14 breasts, and Natrelle expanders in 65. We analyzed areas of adhesion on the surfaces of the tissue expanders when they were exchanged with permanent implants. We investigated whether adhesions occurred on the cephalic, caudal, anterior, and/or posterior surfaces of the expanders. Results Total adhesion occurred in 18 cases, non-adhesion in 15 cases, and partial adhesion in 46 cases. Of the non-adhesion cases, 80% (n=12) were with Mentor CPX4 expanders, while 94.4% (n=17) of the total adhesion cases were with Natrelle expanders. Of the partial adhesion cases, 90.7% involved the anterior-cephalic surface. The type of tissue expander showed a statistically significant relationship with the number of attachments in both univariate and multivariate logistic regression analyses (P<0.001) and with total drainage only in the univariate analysis (P=0.015). Conclusions We sought to identify the location(s) of adhesion after tissue expander insertion. The texture of the implant was a significant predictor of the success of adhesion, and partial adhesion was common. The anterior-cephalic surface showed the highest adhesion rate. Nevertheless, partial adhesion suffices to prevent unwanted rotation of the expander.