• 한국컴퓨터정보학회논문지
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• 제6권3호
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• pp.131-136
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• 2001

본 연구에서는 스티어혁으로 남성용 구두를 제조하였다. 남성 정장용 구두는 KS G 3116의 시멘트 식 제조방법을 적용하였고. 클로로프렌 접착제로 제조하여 평가하였다. 클로로프렌 접착제를 사용하여 제조한 옥스퍼드형 구두에 대한 접착제의 품질실험으로는 내구성 및 내후성 실험을 하였다. 또한, 여성 정장용 구두뿐만 아니라 남성 정장용 구두제조에 사용한 클로로프렌 접착제의 품질실험 결과는 기대 이상이었다. 접착강도 측정에 있어서 구두 앞 코 끝의 박리강도를 측정하는 KS G 3116의 측정방법은 본 연구에서 적용한 구두 앞코에서 굽자리까지의 전체 박리강도를 측정한 경우와 비교시 매우 일치하였다.

• Applied Microscopy
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• 제52권
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• pp.6.1-6.5
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• 2022

We examined the morphology of the fertilized egg and the fine structure of fertilized egg envelopes of Poropanchax normani belonging to the family Poeciliidae, also known as Norman's lampeye using light and electron microscopes. The fertilized eggs with narrow perivitelline space were found to be spherical and demersal, additionally containing small oil droplets in the vitelline membrane. Further, a bundle of adhesive filaments was observed to be present on one side of the fertilized egg. These filaments possessed remarkably high elasticity and were approximately 1-3mm in length. The size of the fertilized egg was determined to be about 1.49 ± 0.07mm (n=30). The outer surface appeared smooth, and adhesive filaments originating at different location of the surface of the envelope were found to be distributed around the egg envelope and were joined together to form a single long bundle in scanning electron microscopic observation. A peak-like structure formed of several straight wrinkles was observed around the micropyle. However, the complete structure of the micropyle could not be studied due to the depth at which it was located. Additionally, the total thickness of the egg envelope was ascertained to be approximately12.5-14.5㎛. The egg envelope consisted of two distinct layers, an outer electron dense layer and an inner lamellar layer, further consisting of 10 sublayers of varying thicknesses. Collectively, it was observed that the morphological characteristics of the fertilized egg, fine structures surrounding the micropyle, outer surface, adhesive structure consisting adhesive filaments, and sections of fertilized egg envelope displayed species specificity.

• Journal of Welding and Joining
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• 제33권2호
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• pp.69-77
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• 2015

High strength steels have been continually being developed to improve in fuel economy in automotive and ensure safety of passengers. New bonding and welding methods have been required for improving weldability on high strength steels. In this study, resistance spot welding and Weld-bond with nugget diameters of 4.0mm, 5.0mm, 6.0mm and 7.0mm were produced and tested, respectively. In order to confirm the effect of nugget diameters on tensile shear characteristic of the Weld-bond, tensile shear characteristics of Weld-bond were compared with those of resistance spot welding and adhesive bonding. Peak load of Weld-bond were increased as the nugget diameter increases. After appearing maximum peak load continuous fracture followed with second peak owing to load being carried by resistance spot weldment. Fracture modes of the adhesive layer in Weld-bond fractures were represented by mixed fracture mode, which are cohesive failure on adhesive part and button failure at resistance spot welds. The results showed that the tensile shear properties can be improved by applying Weld-bond on TRIP steel, and more apparent with nugget diameter higher than 5${\surd}$t.

• Journal of Welding and Joining
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• 제34권1호
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• pp.59-67
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• 2016

The automotive manufactures increase their use of lightweight materials to improve fuel economy and energy usage has a significant influence on the choice of developing materials. To meet this requirements manufacturers are replacing individual body parts with lightweight metals, for these the process treating and painting surfaces is changing. The pre-coated steels are newly developed to avoid the conventional complex and non-environmental painting process in the body-in-white car manufacturing. The development of new joining techniques is critically needed for pre-coated steel sheets, which are electrically non-conductive materials. In the present study, dissimilar combination of pre-coated steel and galvanized steel sheets were joined by the self-piercing rivet, adhesive bonding and hybrid joining techniques. The tensile shear test and free falling high speed crash test were conducted to evaluate the mechanical properties of the joints. The highest tensile peak load with large deformation was observed for the hybrid joining process which has attained 48% higher than the self-piercing rivet. Moreover, the hybrid and adhesive joints were observed better strain energy compared to self-piercing rivet. The fractography analyses were revealed that the mixed mode of cohesive and interfacial fracture for both the hybrid and adhesive bonding joints.

• 한국정밀공학회지
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• 제30권2호
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• pp.154-163
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• 2013

Adhesive bonding and plastic welding have been widely used to join two plastic materials together. The goal of this paper is to determine a proper joining technology of a pair of flat panel (FP) photobioreactor (PBR) case. The material of the FP PBR case is polycarbonate (PC) plate. Two types of adhesion, including acryl adhesive and two-part epoxy adhesive, as well as two types of plastic welding technology, including ultrasonic welding and thermal welding, are employed for joining of PC plates. In order to influence of the adhesion and welding conditions on the joining characteristics of the PC plates in operational conditions of the FP PBR case, the morphology in the vicinity of the joined region as well as the water and pressure resistance characteristic are investigated. In addition, the variation of the bonding strength of the joined region and deformation behaviors in the vicinity of the joined region according to the adhesion and welding conditions is examined via the lap-shear test. From the results of basic experiments, proper joining technologies are chosen. Using the chosen joining technologies, the FP PBR case are fabricated to perform full-scale durability experiment. The results of the full-scale durability experiment have been shown that the chosen joining technologies can be applicable to fabricate the FP PBR case.

• Applied Biological Chemistry
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• 제50권2호
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• pp.101-106
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• 2007

국내 다양한 토양시료로부터 우수 선충포식곰팡이 9 균주를 선발하였다. 순수분리된 선충포식곰팡이는 포식기관의 형태에 따라 3차원적 점착성 그물구조(3-dimensional adhesive nets)를 나타내는 선충포식곰팡이(A 그룹), 2차원적 점착성 그물구조(2-dimensional adhesive nets)를 나타내는 선충포식곰팡이(B 그룹)와 수축성 고리구조(constricting ring)를 나타내는 선충포식곰팡이(C 그룹)로 크게 3개의 형태그룹으로 분류되었다. 이들 각 그룹에 속하는 선충포식곰팡이의 균사체, 분생포자병, 분생포자의 모양과 크기, 분생포자 형성 개수, 분생포자 마디(node), 분생포자 격막의 수와 격막의 위치, 휴면포자의 형성과 크기 및 색 등 형태학적 특징과 선충포식곰팡이의 rDNA ITS 영역을 PCR로 증폭하여 염기서열을 분석한 결과, 분리된 포식곰팡이는 Monacrosporium thaumasium(Kan-2, Kan-4, Kan-11), Arthrobotrys oligospora(Kan-9, Kan-13, Kan-20, Kan-21), A. musiformis (Kan-12), A. dactyloides(Kan-22)로 동정되었다.

• 보존과학회지
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• 제32권1호
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• pp.43-49
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• 2016

금사는 금속물로 제작된 실을 의미하며, 다양한 재료와 재질이 혼합하여 사용되고, 제작 방식에 따라 다양한 형태가 구분된다. 같은 형태일지라도 지역에 따라 사용재료가 다르게 나타나기 때문에 금박, 접착제, 배지 등에 대한 기초 자료 조사는 제작기법 및 유물의 제작국가에 대한 정보를 확인할 수 있기에 중요하다. 이에 본 연구는 직금 유물에 사용된 전통 편금사의 접착특성 및 제작기법 분석을 위한 연구를 진행하였다. 지역 및 시대가 다른 직금 유물을 선정하여 시료를 일부 채취하였다. 전통 금사에 사용했을 것으로 추정되는 접착제를 선정하여, 종류별로 표준시료를 제작하였다. 접착제는 아교, 주토 혼합 아교, 옻, 주칠을 선정하였으며, 식물성 배지인 한지 위에 접착제를 바른 후 순금박을 올렸다. 직금유물에서 채취한 금사와 제작한 표준시료를 일부 채취하여 형태 및 무기원소 성분 분석을 하였다. 연구 결과, 편금사는 금박층, 접착층, 배지층으로 구분이 되는 것을 확인할 수 있었다. 표준시료와 비교 관찰한 결과, 아교 및 주칠혼합시료와 형태적으로 유사하였다. 붉은색 접착층에 대한 정성분석 결과 알루미늄(Al), 규소(Si), 철(Fe) 성분이 현미경에서 관찰된 붉은색과 일치함에 따라 전통 편금사는 아교에 주토를 혼합하여 접착제로 사용한 것으로 판단된다. 이러한 사실은 국내 문헌 및 국외사례를 통해서도 확인할 수 있으며, 아교에 주토를 혼합함으로써 발색 및 평활도에서 효과를 얻고자 함으로 사료된다. 또한 이러한 방법은 옻을 접착제로 사용하는 일본과는 달리 중국, 한국에서 공통적으로 관찰되는 제작방법이라는 사실도 확인할 수 있었다.본 연구를 통해 향후 전통 금사의 재현 및 생산기술에 대한 기초 자료로 활용될 것으로 기대된다.

• Tribology and Lubricants
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• 제17권6호
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• pp.459-466
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• 2001

In this study, the effects of oxide layer formed on the contact parts of TiN coated ball and steel disk on friction characteristics in various sliding conditions were investigated. AISI52100 steel ball was used for the substrate of coated ball specimens, which were prepared by depositing TiN coating with 1(m in coating thickness. AISI1045 steel was used for the disk type counter-body. To investigate the effect of oxide layer on the contact parts of two materials, the tests were performed both in air for forming oxide layer on the contact parts and in nitrogen environment to avoid oxidation. From the test results, the frictional characteristic between the two materials was predominated by iron oxide layer that formed on wear tract of counter-body and this layer caused friction transition and high friction. And the adhesive wear occurred from steel disk to TiN coated ball caused the formation of oxide layer on counter parts between the two materials.

• 한국의류학회지
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• 제19권4호
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• pp.671-683
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• 1995

This paper described the changes of mechanical KES values after fusing 4 different (in weave & density) wool face fabrics with 3 different (in weave & extensibility) fusible interlining. The fusing condition was 15$0^{\circ}C$, 4kg.f/cm2 The results of the study were as follows: (1) After fusing, KES mechanical value of B, 2HB, G, 2HGS, WC increased, where as LT, WT werent't changed so much and EM, RT decreased. It means after fusing extensibility and recovery property were decreased and volume and stiffness were increased. (2) Within the limits of this investigation, tensile property seemed to be more influenced by the characteristics of face fabrics, and bending property nil by the effect of adhesive penetration and shear and compression property did by complex of the characteristics of face fabrics and interlining and the effect of adhesive penetration.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.457-460
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• 2008

CFRP plates has been established as an effective method for rehabilitation and strengthening of concrete structures. The CFRP reinforcements are bonded to beams and slabs using structural adhesives. Adhesive strength can be affected by environmental exposure. During freezing-and-thawing cycling, temperature-induced stresses in the adhesive layer, due to differential thermal expansion between the CFRP and the substrate concrete, may lead to bond damage and contribute to or cause premature CFRP composite separation. This paper presents the results of experimental program undertaken to investigate the effects of freeze-thaw cycling (from -18 to $4^{\circ}C$) on the behavior and failure characteristics of RC beams strengthened in shear with CFRP plate using acoustic emission (AE) technique.