• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.93-94
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• 2012

Recently outside insulation is applied on the building. Adhesion mortar and anchor are used fixing method of outside insulation. However, a research on proper Adhesion Strength is not performed. So outside insulation exfoliate from building in rainy with winds. Therefore, this research suggest proper adhesion strength about conjugation method of outside insulation. As a result, adhesion way using the adhesive mortar + anchor is best. And proper adhesion strength is over 1,065 N.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.3
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• pp.439-445
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• 2012

The stress singularity for the excess adhesive on interface of adhesively bonded joint was investigated by using the 2-dimensional elastic boundary element method (BEM). To establish a reasonable strength evaluation method and a fracture criterion for the excess adhesive of interface in adhesively bonded joint, it is necessary to evaluate fracture parameters with various bonding conditions. Under the variations of adhesively bonded thickness (h) and diameter (d) for the excess adhesive, a stress analysis was performed, and from the results, the stress singularity index (${\lambda}$) and the stress singularity factor (${\Gamma}$) were calculated. The variations have a great influences on the stress singularity for the excess adhesive of interface in adhesively bonded joint, and the ${\Gamma}$ is reduced as the "h" and "d" increase.

• Journal of the Korean Society for Nondestructive Testing
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• v.21 no.4
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• pp.391-397
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• 2001

The guided wave propagation in inhomogeneous multi-layered structures is experimentally explored based on theoretical dispersion curves. It turns out that proper selection of incident angel and frequency is critical for guided wave generation in multi-layered structures. Theoretical dispersion curves greatly depend on adhesive zone thickness, layer thickness and material properties. It was possible to determine the adhesive zone thickness of an inhomogeneous multi-layered structure by monitoring experimentally the change of dispersion curves.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.981-984
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• 2010

생산성 증가 및 비용 절감을 위해 반도체 공정 기술을 단순화 시키는 것이 필요하다. WBL(Wafer Backside Lamination) 기술을 이용해 필름(film) 형태로 얇은 다이접착제를 웨이퍼(wafer)에 접착하여 반도체 칩과 PCB를 붙이는 방법과 직접 PCB에 다이접착제를 붙이는 방법을 사용하면 획기적으로 공정을 단순화 시킬 수 있다. 하지만 Lamination 기법은 고온을 이용하여 모듈화된 PCB에 접착하므로 전도와 복사에 의해 주변 접착제 필름이 녹아 버리는 문제점이 발생한다. 본 연구에서는 고온으로 인한 필름 융해 현상을 방지하기 위하여 배크라이트를 설치하였으며 CFD 해석을 통해 PCB와 반도체 칩을 접착시킬 때 열이 PCB에 미치는 영향을 살펴보았다.

• Journal of Dental Rehabilitation and Applied Science
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• v.28 no.2
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• pp.163-169
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• 2012

Denture adhesive is the material using for enhancing retention and function of the denture. For a long time, denture adhesive was regarded as a repulsive material for dentist. However, it seems that the needs for using this is increasing. This study was planned to recognize the denture adhesive about kinds, components, and action mechanisms through literature review, and also evaluate its clinical effects and implications.

• Journal of Adhesion and Interface
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• v.4 no.3
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• pp.21-32
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• 2003

Various methods for adhesion measurement, which are related to previously published paper [J. of Soc. of Adhe. and Inter, 3,4 (2002)], are reviewed. At first, the prerequisite for the ideal adhesion strength measurement is considered, and three categories of methods for adhesion measurement, such as mechanical, non-mechanical methods and miscellaneous methods, are introduced.

• Journal of Adhesion and Interface
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• v.2 no.2
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• pp.28-34
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• 2001

의료용 감압 접착제(PSAs)는 접착되어지는 피부가 매우 다양한 타입이 있고 그 응용범위가 다양하므로 요구되어지는 것들이 매우 까다롭다. 본 총설은 의료용 PSAs의 특이한 성질의 합성을 포함하여 1985년 이후의 주된 화학적 개발동향에 그 초점을 두고 있다. 응집력 향상으로 Hot melt형 접착제를 주로 검토할 것이다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.11a
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• pp.179-180
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• 2023

The adhesion performance of PCCs for crack repair of RC structures was greater in the case of using ultra high-early strength cement than in the case of using ordinary Portland cement, and the effect of mixing silica fume was higher in the case of ordinary Portland cement than that of ultra high-early strength cement. On the other hand, 130% of W/C was more fluid than 80% of W/C in the same P/C 80%, which increased the fillability and improved the strength, but the strength improvement effect was the greatest in adhesion in flexure. Through this study, the basic characteristics of the adhesion performance of PCCs were identified, and based on this, it is necessary to induce an optimal mixing design that can increase adhesion performance through various mixing designs.

• Journal of Dental Rehabilitation and Applied Science
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• v.28 no.1
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• pp.67-78
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• 2012

The purpose of this study was to determine whether there were differences in shear bond strength to human dentin using IDS technique compared with DDS. Forty freshly extracted human molars were and devided into 4 groups. The control group specimens were, on the morrow of tooth preparation, light-cured after application of dentin bonding agent and cemented with resin cement. The IDS/SE(immediate dentin sealing, Clearfil$^{TM}$ SE Bond) and IDS/SB (immediate dentin sealing, Adapter$^{TM}$ Single Bond 2) specimens were, on the morrow of tooth preparation, light-cured after application of dentin bonding agent(Clearfil$^{TM}$ SE Bond and Adapter$^{TM}$ Sing Bond 2, respectively), whereas DDS specimens were not treated with any dentin bonding agent. IDS/SE, IDS/SB and DDS specimens were thermocycled. Following that delay, specimens were cemented with resin cement. The dentin bonding agent was left unpolymerized until the application of porcelain restoration. Shear bond strengths were measured using a universal testing machine. Specimens also were evaluated for mode of fracture using an optical microscope. The mean shear bond strengths of control group and IDS/SE groups were not statistically different from one another. The bond strength of IDS/SE group had a significantly higher mean than that of DDS group. There was no significant difference in the mean shear bond strength between IDS/SB(4.11MPa) and DDS group. The evaluation of failure modes indicates that most failures in the control group and IDS/SE groups were mixed, whereas failures in the DDS group were interfacial. When preparing teeth for indirect ceramic restoration, IDS with Clearfil$^{TM}$ SE Bond results in improved shear bond strength compared with DDS.

• Journal of the Korea Concrete Institute
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• v.14 no.1
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• pp.126-135
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• 2002

Plate bonding technique has been widely used in strengthening of existing concrete structures, although it has often a serious problem of premature falure such as interface separation and rip-off. However, this premature failure problem has not been well explored yet especially in view of local failure mechanism around the interface of plate ends. The purpose of the present study is, therefore, to identify the local failure of strengthened plates and to derive a separation criterion at the interface of plates. To this end, a comprehensive experimental program has been set up. The double lap pull-out tests considering pure shear force and half beam tests considering combined flexure-shear force were performed. The main experimental parameters include plate thickness, adhesive thickness, and plate end arrangement. The strains along the longitudinal direction of steel plates have been measured and the shear stress were calculated from those measures strains. The effects of plate thickness, bonded length, and plate end treatment have been also clarified from the present test results. Nonlinear finite element analysis has been performed and compared with test results. The Interface properties are also modeled to present the separation failure behavior of strengthened members. The cracking patterns as well as maximum failure loads agree well with test data. The relation between maximum shear and normal stresses at the interface has been derived to propose a separation failure criterion of strengthened members. The present study allows more realistic analysis and design of externally strengthened flexural member with steel plates.